WO2006077723A1 - 光学フィルム、楕円偏光板、円偏光板、液晶表示素子、及び該光学フィルムの製造方法 - Google Patents
光学フィルム、楕円偏光板、円偏光板、液晶表示素子、及び該光学フィルムの製造方法 Download PDFInfo
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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
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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
- G02B5/3016—Polarising elements involving passive liquid crystal elements
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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
- 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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- 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
- G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2323/00—Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2323/00—Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition
- C09K2323/02—Alignment layer characterised by chemical composition
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2323/00—Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition
- C09K2323/03—Viewing layer characterised by chemical composition
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2323/00—Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition
- C09K2323/03—Viewing layer characterised by chemical composition
- C09K2323/031—Polarizer or dye
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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
- G02F1/133638—Waveplates, i.e. plates with a retardation value of lambda/n
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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
- G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
- G02F1/13378—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by treatment of the surface, e.g. embossing, rubbing or light irradiation
- G02F1/133788—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by treatment of the surface, e.g. embossing, rubbing or light irradiation by light irradiation, e.g. linearly polarised light photo-polymerisation
Definitions
- optical film Optical film, elliptically polarizing plate, circularly polarizing plate, liquid crystal display element, and method for producing the optical film
- the present invention relates to an optical film, an elliptically polarizing plate, a circularly polarizing plate, and a liquid crystal using these optical films obtained by laminating optically anisotropic layers obtained by polymerizing a polymerizable liquid crystal composition in an aligned state.
- the present invention relates to a display element and a method for producing the optical film.
- a circularly polarizing plate and an elliptically polarizing plate are a combination of a polarizing plate and an optical film having an appropriate phase difference, which is indispensable for the principle of operation of the display, and the purpose of solving the problem of visual field characteristics. Therefore, it is used as one member of a liquid crystal display device.
- LCD for example, STN type LCD, TFT—LCD, IPS (In-Plane Switching) type LCD, FLC (Feroelectric Liquid Crystal) type) LCD, OCB (Optically Compensated Bend) LCD, VA (Vertically Aligned) LCD, ECB (Electrical Controlled Birefringence) LCD, HAN
- LCD for example, STN type LCD, TFT—LCD, IPS (In-Plane Switching) type LCD, FLC (Feroelectric Liquid Crystal) type) LCD, OCB (Optically Compensated Bend) LCD, VA (Vertically Aligned) LCD, ECB (Electrical Controlled Birefringence) LCD, HAN
- hybrid Aligned Nematic
- GH Guard host
- transmissive type reflective type
- transflective type A circularly or elliptically polarizing plate suitable for each method is required.
- TFT-LCD liquid crystal display devices
- LCD liquid crystal display devices
- TFT-LCD displays depending on the viewing direction in order to eliminate the problem of coloration of the screen due to the phase difference imparted when the liquid crystal is transmitted.
- an elliptical polarizing plate combining a linear polarizing plate and an optical film is used.
- reflective, semi-transmissive, and micro-reflective LCDs that use external light as a light source use a circular polarizer that combines a 1Z4 wavelength plate with a linear polarizer.
- the normal 1Z4 wavelength plate has a phase difference of 1Z4 wavelength only at one wavelength, and the phase difference at other wavelengths is shifted from this value. Therefore, the 1Z4 wavelength plate covers the entire visible light range.
- a broadband circularly polarizing plate combining a broadband retardation film and a linearly polarizing plate made by laminating one or multiple 1Z2 wave plates and 1Z4 wave plates, A broadband elliptical polarizing plate combining a retardation film and a polarizing plate has also been developed.
- a circularly polarizing plate in which a polarizing plate and a 1Z4 wavelength plate are combined is formed by superposing a polarizing plate and a 1Z4 wavelength plate, respectively. At this time, they must be superposed so that the angle between the absorption axis of the polarizing plate and the slow axis of the 1Z4 wave plate exactly matches 45 °.
- a broadband circularly polarizing plate that combines a polarizing plate and a broadband retardation film formed by laminating a plurality of waveplates, and the laminating angle with respect to the azimuth angle of each waveplate and the absorption axis of the waveplate and the polarizing plate It is necessary to strictly control the stacking angle.
- the angle between the optical axis of the wave plate and the alignment direction of the liquid crystal must be exactly as designed.
- a birefringent stretched film has been used for the retardation film, but in recent years, a polymerizable liquid crystal is applied on a substrate provided with an alignment film as a retardation film having more complicated optical properties.
- an optical film in which the liquid crystal molecules are aligned and cured has been developed. Specifically, a polymer film such as polyimide is provided on the substrate, and a polymerizable liquid crystal is applied on the alignment film that is rubbed (rubbed) with cloth or the like in one direction, and the liquid crystal molecules are rubbed in the rubbing direction. , And then polymerized to fix the alignment.
- the combination of the alignment direction of the alignment film and the alignment mode of the polymerizable liquid crystal has optical properties that cannot be obtained with a stretched birefringent film. A retardation film is obtained.
- the rubbing alignment film has a problem that scratches and dust are generated during the rubbing process. Dust generation can be removed by cleaning, but scratches cannot be removed, so the optical uniformity of the laminated liquid crystal film may be greatly impaired.
- the manufacturing process using a rubbing type alignment film and a roll-like long film there is a limit to the rubbing direction relative to the film transport direction, so the slow axis of the retardation film remains as a long film. It is practically impossible to make the above-mentioned stacking angle. Therefore, in a normal manufacturing process, an appropriate stacking angle A long film force is used to cut a rectangular film, and a method of laminating and laminating the cut film at an appropriate angle is used.
- a photo-alignment film is known as an alignment film without rubbing.
- the photo-alignment method is one of the alignment methods that can align liquid crystal molecules without rubbing. By simply irradiating light on the film formed on the substrate, the liquid crystal alignment ability can be produced in the film without contact. Can be made.
- the alignment can be controlled by the direction of light, and unlike the rubbing method, it has the characteristics that there is no possibility of scratches or dust generation in principle, so a retardation film using a liquid crystal having a polymerizable group is created. Above, the degree of freedom in controlling the orientation state is increased, and a uniform film can be formed in which light leakage due to scratches is eliminated.
- a photoalignable polymerizable composition containing a dichroic dye having two or more polymerizable groups in one molecule is applied on a substrate, and a photoalignment function is imparted by irradiating polarized light.
- a photo-alignment film obtained by heating or irradiating light to polymerize the polymerizable group, or a polymerizable substance such as 4, polyburcinnamate is applied on the substrate, A photo-alignment film obtained by irradiating and reacting with anisotropic light is known (for example, see Patent Document 2).
- an optical film made of a photo-alignment film made of polyvinyl cinnamate and a polymerizable liquid crystal described in Patent Document 2 is also known (see, for example, Patent Documents 3 and 4).
- the optical film obtained by using these photo-alignment films has a problem that the interface between the photo-alignment film and the polymerizable liquid crystal layer peels off, resulting in poor durability.
- an optical film having excellent durability a polymer coating film having a polymerizable group provided on a substrate is rubbed, a discotic liquid crystal having a polymerizable group is applied thereon, and a rubbing alignment film is formed.
- An optical compensation sheet having excellent durability which is chemically bonded to an optically anisotropic layer made of discotic liquid crystal via an interface, is known.
- this method uses a rubbing alignment film, the rubbing arrangement is still used. The problem derived from the counter membrane has not been solved.
- the optical compensation sheet relates to a vertical alignment film in which the diameter direction of discotic liquid crystal molecules is aligned in a direction perpendicular to the substrate, and introduces a long alkyl chain, an aliphatic chain, or the like. As a result, the surface energy of the alignment film is lowered, so that there is a problem that liquid crystal molecules aggregate on the surface of the vertical alignment film and are difficult to stack in a thin film state.
- Patent Document 1 Japanese Patent Laid-Open No. 2002-250924
- Patent Document 2 Japanese Patent Laid-Open No. 07-138308
- Patent Document 3 Japanese Patent Laid-Open No. 06-289374
- Patent Document 4 Japanese Patent Laid-Open No. 08-15681
- Patent Document 5 Japanese Patent Laid-Open No. 09-152509
- An optical film having various functions can be produced by laminating two optically anisotropic layers.
- two optical delay axes are used.
- the corners must be exactly as designed.
- the angle between the optical axis of the optical film and the alignment direction of the liquid crystal must also be exactly as designed!
- the conventional optical film can sufficiently obtain the above lamination accuracy.
- an optical film having an optical function as designed could not be obtained.
- a photo-alignment film By using a photo-alignment film, a polymerizable liquid crystal layer aligned in an arbitrary alignment direction can be formed. By repeating this process, a multilayer film having a desired laminating angle of the slow axis can be easily obtained. What you can get into
- the alignment axis of the photo-alignment film can be determined by the light irradiation direction, it can be stacked at the precise stacking angle as designed.
- Both the photo-alignment film layer and the polymer layer can be obtained by a coating method, and the orientation direction can be controlled in a non-contact manner depending on the direction of irradiation light, so that any orientation direction that does not require complicated processes such as film cutting and bonding is required.
- a polymerizable liquid crystal layer oriented in the above can be formed.
- step a when a photoalignable polymerizable composition containing a photoalignable group and a compound having a polymerizable group is applied and dried (step a), the polarized light or group having a wavelength that can be absorbed by the photoalignable group. Irradiating the plate with non-polarized light having an oblique direction force to give liquid crystal alignment ability (step b), forming a polymerizable liquid crystal composition layer having a polymerizable group on the layer (step c), 2 layers stacked And step (I) (hereinafter abbreviated as step (I)), in which both layers are cured by active energy rays or heat and at the same time the molecules of both layers are overlapped (step d).
- step (I) 2 layers stacked And step (I)
- the present invention includes a photo-alignment layer (A) having a liquid crystal alignment ability produced by light irradiation and a liquid crystal compound having a polymerizable group, and is aligned in the photo-alignment layer (A).
- a photo-alignment layer (A) having a liquid crystal alignment ability produced by light irradiation and a liquid crystal compound having a polymerizable group is aligned in the photo-alignment layer (A).
- an optical film in which a plurality of optically anisotropic layers in which a polymer layer (B) obtained by polymerization is bonded by a covalent bond are laminated.
- the present invention also provides an elliptically polarizing plate having the optical film described above and a polarizing plate.
- the present invention also provides a circularly polarizing plate having the optical film described above and a polarizing plate.
- the present invention also provides a liquid crystal display device using the optical film described above.
- the present invention is a method for producing the optical film as described above, wherein the compound has a photoalignable group and a polymerizable group, or a photoalignment comprising a compound having a photoalignable group and a polymerizable compound. Applying a photopolymerizable composition and drying to form a photoalignable polymerizable composition layer a, and polarized light having a wavelength that can be absorbed by the photoalignable group or non-polarized light from an oblique direction with respect to the substrate.
- Step b for forming a polymerizable liquid crystal composition layer containing a polymerizable liquid crystal composition containing a liquid crystal compound having a polymerizable group on the layer;
- the step (I) of repeating the step (d) in which the two layers are polymerized between the molecules of the two layers at the same time as the curing of the two layers is advanced by active energy rays or heat. I will provide a.
- the invention's effect of repeating the step (d) in which the two layers are polymerized between the molecules of the two layers at the same time as the curing of the two layers is advanced by active energy rays or heat.
- the optical film of the present invention is a laminated film having excellent durability, which is precisely laminated with the positional relationship (lamination angle) of the optical axis as designed.
- a circularly polarizing plate and an elliptically polarizing plate obtained by stacking the optical film of the present invention and a polarizing plate can be easily obtained without the need for strict alignment and complicated processes.
- optical films, circularly polarizing plates, and elliptically polarizing plates do not generate materials that are wasted during the manufacturing process.
- the compound having a photo-alignable group and a polymerizable group which is a material for the photo-alignment layer (A) in which the liquid crystal alignment ability is generated by light irradiation in the optical film of the present invention.
- an optical film laminated by selecting a low molecular weight raw material as a composition comprising a compound having a photoalignment group and no polymerizable group and a general-purpose polymerizable compound can also be solved. Since the low molecular weight raw material is slightly inferior in smoothness, it is difficult to cause a boundary with the upper layer.
- optically excellent optical film in which no interface reflection occurs at the boundary between the photo-alignment layer (A) and the polymer layer (B).
- This is particularly useful when an optical film is obtained by laminating a number of layers such as a broadband circularly polarizing plate and a broadband elliptically polarizing plate.
- the optical film, circularly polarizing plate, and elliptically polarizing plate of the present invention can all be obtained by a coating method, and the present optical film can be continuously bonded to a linearly polarizing film. Therefore, there is no need for complicated steps such as cutting and pasting with controlled angles as in the prior art. Therefore, the present invention can be applied to a roll-and-roll method or the like with high productivity using a long film.
- FIG. 1 is a cross-sectional view of an example of the optical film of the present invention.
- FIG. 2 is a cross-sectional view of an example of an elliptically polarizing plate and a circularly polarizing plate using the optical film of the present invention.
- FIG. 3 is a cross-sectional view of an example of the optical film of the present invention including an optically isotropic resin layer.
- FIG. 4 is a cross-sectional view of an example of a liquid crystal display element using the optical film of the present invention.
- the optically anisotropic layer used in the present invention is composed of a photo-alignment layer (A) (hereinafter abbreviated as layer (A)) and a polymer layer (B) (hereinafter referred to as layer) having liquid crystal alignment ability produced by light irradiation. It is abbreviated as (B).
- layer (A) a photo-alignment layer
- B polymer layer
- This is a compound having a photoalignable group and a polymerizable group (hereinafter abbreviated as compound (C)), or a compound having a photoalignable group and having no polymerizable group (hereinafter referred to as chemical compound).
- compound (D) Abbreviated compound (D).
- a general-purpose polymerizable compound hereinafter abbreviated as compound (E)
- a photo-alignable polymerizable composition layer hereinafter referred to as photo-alignable polymerizable composition
- a polymerizable liquid crystal composition layer containing a polymerizable liquid crystal composition containing a liquid crystal compound having a polymerizable group hereinafter abbreviated as a polymerizable liquid crystal composition layer. It can be obtained by reacting both layers in a state in which the liquid crystal compound having a polymerizable group formed on the substrate is aligned.
- the photo-alignable polymerizable composition layer corresponds to the layer (A)
- the polymerizable liquid crystal composition layer corresponds to the layer (B).
- optically anisotropic layer used in the present invention has a shared interface between the layer (A) and the layer (B), where the layer (A) and the layer (B) need not be completely polymerized and cured. It ’s good if they ’re joined together!
- the step (I) (hereinafter referred to as the step (c)) includes the step (c) for forming and the step (d) for polymerizing the molecules of both layers at the same time as the two laminated layers are cured by active energy rays or heat.
- an optically anisotropic layer can be obtained. Further, by repeating step (I) a plurality of times, an optical film in which a plurality of optically anisotropic layers are laminated can be obtained.
- the If column of the optical film of the present invention is shown in FIG. Fig. U shows the optical finem, photo-alignment layer ( ⁇ ), polymer layer ( ⁇ ), and optically anisotropic layer.
- the layer ( ⁇ ) 11 contains a compound having a group that generates liquid crystal alignment ability when irradiated with light (hereinafter abbreviated as a photoalignable group), for example, a dichroic dye.
- the photo-alignment group of compound (C) or compound (D) is a molecular orientation induction or differentiating reaction caused by the Weigert effect caused by photodichroism caused by light irradiation (eg, azobenzene). Group), dimerization reaction (eg cinnamoyl group), photocrosslinking reaction (eg benzophenone group), or photolysis reaction (eg polyimide group) To express.
- molecular orientation induction or isomerization reaction due to Weigert effect caused by photodichroism, dimerization reaction, or photocrosslinking reaction is used. These are preferred because they have excellent orientation and can easily align the polymerizable liquid crystal compound.
- a group having (excluding a heavy bond) is particularly preferably used.
- the Weigert effect means that the direction of orientation of a molecule having a transition moment is changed so that the transition moment of the molecule is perpendicular to the polarization direction of incident light.
- Examples of the group having a C ⁇ N bond include groups having a structure such as an aromatic Schiff base and an aromatic hydrazone.
- These groups may have a substituent such as an alkyl group, an alkoxy group, an aryl group, a aryloxy group, a cyano group, an alkoxycarbo group, a hydroxy group, a sulfonic acid group, and a halogenoalkyl group.
- azobenzene groups or anthraquinone groups that exhibit photoalignment by photoisomerization reaction or benzophenone groups, cinnamoyl groups, chalcone groups, or coumarin groups that exhibit photoalignment by photodimerization reaction Irradiation of polarized light necessary for photoalignment
- the amount of the photo-alignment film obtained in a small amount is particularly preferable because it is excellent in thermal stability and temporal stability.
- an azobenzene group is preferred.
- the layer (A) 11 and the layer (B) 12 are bonded by a covalent bond. This is because a laminated film of a photo-alignable polymerizable composition layer and a polymerizable liquid crystal composition layer is formed on a substrate, and the liquid crystal compound having the polymerizable group is aligned, and both layers are reacted. Can be obtained.
- Examples of the polymerizable group that the compound (c) has include, for example, a (meth) attaroyl group, a (meth) attaroyloxy group, a (meth) acrylamide group, a bur group, a buroxy group, an azide group, a chloromethyl group, an epoxy group, And maleimide groups.
- a (meth) attaroyl group, a (meth) attaroyloxy group, a (meth) acrylamide group, a bur group, a buroxy group, an azide group, a chloromethyl group, an epoxy group, And maleimide groups are preferred (meta).
- A) taroloyl group, a (meth) atalylooxy group, or a (meth) acrylamide group is more preferred. If it is a maleimide group, it can be polymerized without using a photopolymerization initiator.
- These polymerizable groups may be directly bonded to the photo-alignment group or may be bonded via a linking group such as an alkylene group or a fullerene group.
- the linking group may have an ester bond, an ether bond, an imide bond, an amide bond or a urethane bond.
- Examples of such a linking group include methylene group, ethylene group, trimethylene group, tetramethylene group, pentamethylene group, hexamethylene group, heptamethylene group, otatamethylene group, nonamethylene group, decamethylene group, undecamethylene group, dodecamethylene group.
- Linear alkylene groups having 1 to 18 carbon atoms such as 1-methylethylene group, 1-methyl-trimethylene group, 2-methyl-trimethylene group, 1-methyl-tetramethylene group, 2-methyl- A branched alkylene group having 1 to 18 carbon atoms, such as a tetramethylene group, a 1-methyl-pentamethylene group, a 2-methyl-pentamethylene group, and a 3-methyl-pentamethylene group; a p-phenylene group, etc.
- the molecular weight of the compound (C) or the compound (D) is not particularly limited! /, But is usually used in the range of 1 ⁇ 10 2 to 1 ⁇ 10 6 in terms of mass average molecular weight. However, if the molecular weight is too high, the photo-alignment group becomes difficult to move in the system, and the sensitivity to light tends to decrease. In general, the higher the molecular weight, the better the film formability and the smooth surface coating is obtained. However, in the present invention, when the surface of the layer (A) 11 is very smooth, the layer (B) 12 Borders, and optical effects may occur.
- the compound (C) is preferably a compound represented by the general formula (1).
- R 1 and R 2 are each independently a group consisting of a (meth) atalyloyl group, a (meth) atalylooxy group, a (meth) acrylamide group, a bur group, a buroxy group, and a maleimide group. And represents a polymerizable group selected.
- a (meth) atallyloyl group, a (meth) ataryloxy group, or a (meth) acrylamide group is preferable because photopolymerization and thermal polymerization are relatively easy.
- a maleimide group is more preferable because a polymerization initiator is not required.
- X 1 represents a linking group represented by — (A 1 — B 1 ) —
- X 2 represents — (B 2
- a 1 and A 2 each independently represent a single bond or a divalent hydrocarbon group.
- the divalent hydrocarbon group include an alkylene group having 1 to 20 carbon atoms such as an ethylene group, a methylene group, a propylene group, a pentamethylene group, and a heptylene group; and a carbon atom number such as a cyclopropylene group and a cyclohexylene group.
- B 1 and B 2 each independently represents a single bond, O—, —CO—O—, —OCO—, —CONH—, NHCO—, —NHCO—O, or —OCONH.
- m and n each independently represents an integer of 1 to 4. When m or n is 2 or more, there are multiple A 2 and B 2 may be the same or different. However, A 1 or A 2 sandwiched between two B 1 or B 2 is not a single bond. Specifically, when m is 2, the linking group represented by — (A 1 — B 1 ) — is CH CH —O—CH CH CH CH—CO—O or O—CH C
- O-CO-Ph phenylene group -0- (CH)-and the like.
- Y represents a group having an azobenzene group, an anthraquinone group, a benzophenone group, a cinnamoyl group, a chalcone group or a coumarin group. Among these, a group having the following structure is preferable.
- p to p each independently represent a hydrogen atom, a halogen atom, or a halogenial.
- Kill group halogenated alkoxy group, cyano group, nitro group, alkyl group, hydroxyalkyl group, alkoxy group, aryl group, aryloxy group, alkoxycarbonyl group, carboxyl group, sulfonic acid group, amino group, or hydroxy group Represents a group.
- the carboxyl group and sulfonic acid group may form a salt with an alkali metal.
- the compound represented by the general formula (1) examples include compounds described in JP-A-2002-250924 and JP-A-2002-317013. It can be easily synthesized by this method. [0038] Since the compound represented by the general formula (1) has a low molecular weight, it has excellent sensitivity to light when formed into a coating film. Therefore, liquid crystal alignment ability can be easily imparted by light irradiation. In addition, since the polymerizable group has a higher degree of freedom than the polymerizable group bonded to the polymer, the layer (A) 11 having a high reaction rate and the layer (B) 12 can be reacted well at the interface. Excellent adhesiveness.
- azo dye As the compound (D), azo dye, anthraquinone dye, indigo dye, phthalocyanine dye, carbo dye, quinone imine dye, methine dye, quinoline dye, nitro dye, -toro dye, benzoquinone dye , Naphthoquinone dyes, naphthalimide dyes, perinone dyes, and the like.
- Specific examples include compounds represented by general formula (2).
- X 1 , Y, and X 2 represent the same group as the group represented by the general formula (1).
- R 3 and R 4 are each independently a hydrogen atom, a halogen atom, a hydroxyl group, a nitro group, a sulfonate group, a sulfonate group, a halogenated methyl group, a cyan group, an amino group, a formyl group, a carboxyl group, Piperidino group and general formula (3)
- R 5 represents a hydrogen atom, an alkyl group, a cycloalkyl group, a phenol group, a piperidino group; and these groups include an alkyl group, a cycloalkyl group, a phenyl group, an alkoxyl group, and a cycloalkoxyl group. Or represents an organic group to which a phenoxy group is bonded.
- the compound (E) for example, a (meth) atalyloyl group, a (meth) acryloyloxy group, a (meth) acrylamide group, a bur group, a buroxy group, an azide group, a chloromethyl group, an epoxy group, a maleimide group, etc. And a polymerizable compound having the following. Above all, the tendency of hydrophilicity A strong acrylic monomer having a hydroxyl group or an ethylene glycol unit is preferably a silane coupling agent such as methacrylic acid 3-trimethoxysilylpropyl ether.
- Compound (E) can be used by adding to compound (C) within a range without impairing the photo-alignment property! The specific amount of the additive is preferably 10 to 95% by mass, more preferably 20 to 90% by mass, still more preferably 20 to 50% by mass.
- the transmitted light intensity ratio is one of the indexes.
- contrast is expressed as the ratio of transmitted light intensity during bright display to low transmitted light intensity almost close to 0.0 during dark display.
- the transmitted light intensity ratio in the direction tilted with respect to the front is reduced even by 1.0%, the actually measured contrast will be further reduced, causing the viewing angle characteristics of the contrast to be greatly reduced.
- the compounds (C), (D) and (E) are preferably used by dissolving in an appropriate solvent.
- the solvent is not particularly limited, but glycols such as ethylene glycol, propylene glycol, dipropylene glycol monomethyl ether, alcohols such as methanol, ethanol, isopropyl alcohol, butanol, water, N-methylpyrrolidone (hereinafter referred to as NMP) Abbreviation), butylcetone solve, ferrulece solve, N, N dimethylformamide (hereinafter abbreviated as DMF), y-butyrate latatane, dimethyl sulfoxide (hereinafter abbreviated as DMS O), toluene, Tetrahydrofuran, black benzene, dimethylacetamide and the like.
- NMP N-methylpyrrolidone
- DMF N dimethylformamide
- DMS O dimethyl sulfoxide
- solutions may be used in combination of two or more, which are preferably selected in consideration of the coating property, the volatilization rate of the solvent after coating, and the solvent solubility of the substrate.
- a mixed solvent composed of a mixed solvent of butyl cholesolve and water and alcohols or glycols has a good coating property on a substrate such as a polymer film, and a uniform film is obtained without damaging a high molecular film. Is particularly preferable.
- the solid content concentration of the compound (C) needs to be at least 0.2% by mass or more. Among these, a range of 0.3 to 10% by mass is particularly preferable.
- polymer materials such as polyvinyl alcohol and polyimide can be mixed within a range not impairing the effects of the present invention.
- the thickness of the layer (A) 11 is preferably as thin as possible because the ultraviolet energy used for the alignment treatment can be kept low and the production rate can be increased. Alternatively, the uniformity of orientation is deteriorated as soon as it is affected by surface characteristics. Therefore, there is an optimal range.
- the thickness of the layer (A) 11 is preferably from 1 to 200 nm.
- 5-: LOOnm is more preferably from 10 to 40 nm.
- the polymerizable liquid crystal compound having a polymerizable group contained in the polymerizable liquid crystal composition constituting the layer (B) 12 exhibits liquid crystal properties alone or in combination with other liquid crystal compounds.
- the polymerizable liquid crystal compound having a polymerizable group contained in the polymerizable liquid crystal composition constituting the layer (B) 12 exhibits liquid crystal properties alone or in combination with other liquid crystal compounds.
- it is a compound having a polymerizable group.
- a rod-like liquid crystal compound having a polymerizable group is preferable because it can be easily produced in a liquid crystal phase temperature range including a low temperature around room temperature.
- step (I) An example is given as a specific embodiment of the step (I).
- Fluorescent alignment polymerizable composition is applied and dried, and then the film is irradiated with polarized light having a wavelength that can be absorbed by the photoalignable group of compound (C) or (D) to give liquid crystal alignment ability .
- the photo-alignment group is a group that utilizes molecular orientation induction or isomerization reaction due to the Weigert effect
- the non-polarized light having a wavelength that is efficiently absorbed by the group from an oblique direction with respect to the substrate. Irradiation may provide a liquid crystal alignment function (this is the same for other embodiments).
- the polymerizable liquid crystal composition layer has the intended alignment due to the effect of the liquid crystal alignment ability of the photoalignable polymerizable composition layer. Take a state.
- two layers of light having a wavelength that is absorbed by the added photopolymerization initiator are irradiated to advance the curing of the polymerizable liquid crystal compound, and at the same time, the polymerizable liquid crystal composition layer, the photo-alignment polymerizable composition layer, Polymerization is carried out between the molecules of both layers by the photopolymerization initiator present at the interface.
- Radicals generated by the cleavage of the photopolymerization initiator can move between the two layers. Therefore, if the photopolymerization initiator is contained in either layer, the polymerizable groups present at the interface between the two layers are polymerized.
- the layer (A) 11 and the layer (B) 12 can be covalently bonded to obtain an optically anisotropic layer 13 with improved adhesion. Furthermore, in this method, since the photo-alignable polymerizable composition does not contain a photo-polymerization initiator, it is possible to uniformly perform an alignment process in which unexpected polymerization may not occur during irradiation of polarized light or the like.
- a polymerizable liquid crystal composition layer containing a photopolymerization initiator is coated on a transparent substrate without applying a photo-alignment polymerizable composition containing a polymerization initiator, drying and then aligning. Is formed.
- polarized light having a wavelength that can be absorbed by the photoalignable group of compound (C) or (D) or non-oblique from the oblique direction to the substrate. Irradiate polarized light.
- the photo-alignment group in the photo-alignment polymerizable composition is irradiated first.
- the photo-alignable polymerizable composition layer It absorbs most of the light, and its liquid crystal alignment ability occurs, aligning the molecules of the laminated polymerizable liquid crystal composition layer.
- the irradiation light is transmitted through the photo-alignable polymerizable composition layer by the mechanism described below, reaches the polymerizable liquid crystal composition layer, and cleaves the photopolymerization initiator in the layer.
- bonding between the photo-alignable polymerizable composition layer and the polymerizable liquid crystal composition layer also occurs.
- the photo-alignment polymerizable composition is aligned by light absorption.
- the direction changes and takes an orientation state that minimizes absorption. For this reason, the irradiation light gradually leaks into the polymerizable liquid crystal composition layer, and induces polymerization of the polymerizable liquid crystal composition layer.
- a compound using a dimerization reaction eg, cinnamoyl group
- a photocrosslinking reaction eg: benzophenone group
- a photodecomposition reaction eg: polyimide group
- the components oriented in the direction due to the absorption of polarized light are dimerized, photocrosslinked, and photodecomposed, and the group that absorbs light gradually decreases, and the irradiated light leaks to the polymerizable liquid crystal composition layer.
- polymerization of the polymerizable liquid crystal composition layer is induced.
- the layer (A) 11 and the layer (B) 12 are covalently bonded, and the optically anisotropic layer 13 with improved adhesion can be obtained. Also in this case, since the photoalignable polymerizable composition does not contain a photopolymerization initiator, it is possible to uniformly perform the alignment treatment without the possibility of unexpected polymerization during irradiation of polarized light.
- a photopolymerization initiator having a light absorption wavelength band different from the light absorption band of compound (C) or (D) is added to one or both of the polymerizable liquid crystal composition and the photoalignable polymerizable composition. How to add
- the photoalignable polymerizable composition solution After the photoalignable polymerizable composition solution is applied on the substrate and dried, the polarized light having a wavelength that can be absorbed by the photoalignable group of the compound (C) or (D) or non-polarized light obliquely with respect to the substrate To give liquid crystal alignment ability.
- a polymerizable liquid crystal composition solution is applied thereon, and after drying, the polymerizable liquid crystal compound is brought into an intended alignment state.
- the two laminated layers are irradiated with light having a wavelength that is absorbed by the added photopolymerization initiator to bond the molecules at the interface between the polymerizable liquid crystal composition layer and the photoalignable polymerizable composition layer.
- the photoalignable polymerizable composition solution After the photoalignable polymerizable composition solution is applied on the substrate and dried, the polarized light having a wavelength that can be absorbed by the photoalignable group of the compound (C) or (D) or non-polarized light obliquely with respect to the substrate To give liquid crystal alignment ability.
- a polymerizable liquid crystal composition layer is formed on the layer, and both layers are heated to cleave the thermal polymerization initiator to advance curing of both layers.
- the thermal polymerization initiator existing at the interface with the photo-alignable polymerizable composition layer polymerizes between the molecules of both layers.
- the radicals generated by the cleavage of the thermal polymerization initiator can move between both layers, so if they are contained in either layer, the polymerizable groups present at the interface between both layers can be polymerized.
- the layer (A) 11 and the layer (B) 12 are covalently bonded to obtain an optically anisotropic layer 13 with improved adhesion.
- the photo-alignable polymerizable composition containing the thermal polymerization initiator After applying the photo-alignable polymerizable composition containing the thermal polymerization initiator onto the substrate and drying it, it is applied to polarized light having a wavelength that can be absorbed by the photo-alignable group of the compound (C) or (D) or the substrate. Irradiation with non-polarized light from the oblique direction gives liquid crystal alignment ability.
- a polymerizable liquid crystal composition layer containing a photopolymerization initiator is formed on the layer, and the photopolymerization initiator is heated while heating the two laminated layers to an appropriate temperature at which the thermal polymerization initiator is cleaved.
- the curing of both layers proceeds and at the same time the molecules of both layers are polymerized.
- a photopolymerization initiator having a light absorption wavelength band different from that of the photoalignable polymerizable composition itself is added to the photoalignable polymerizable composition, and after film formation and drying, the compound (C ) Or (D) is capable of absorbing polarized light that can be absorbed or non-polarized light from an oblique direction to the substrate to give liquid crystal alignment ability.
- a polymerizable liquid crystal composition layer to which a thermal polymerization initiator has been added is formed on the layer, and both layers are heated and irradiated with light absorbed by the photopolymerization initiator to simultaneously cure both phases. Polymerize between the molecules of both layers. By such an operation, a retardation film with improved adhesion can be obtained by providing bonding between the photo-alignable polymerizable composition layer and the polymerizable liquid crystal composition layer.
- the method of forming each composition layer on the substrate includes a spin coating method, an etching method, a gravure coating method, a die coating method, a bar coating method, a coating method such as an applicator method, and a printing method such as a flexo method. Any known method can be used.
- Plastic substrates include cell mouths, cellulose derivatives such as triacetyl cellulose and diacetyl cellulose, polycyclohexylene derivatives, polyesters such as polyethylene terephthalate and polyethylene naphthalate, polyolefins such as polypropylene and polyethylene, polycarbonates and polybules.
- Alcohol, polyvinyl chloride, polyvinyl chloride, nylon, polystyrene, polyacrylate, polymethyl methacrylate, polyethersulfone, polyarylate and the like can be used.
- the optical film 10 of the present invention manufactured by coating on a substrate may be bonded to a linearly polarizing film.
- the optical film 10 formed by coating may be peeled off from the substrate and bonded to the linearly polarizing film.
- the optical film 10 of the present invention can be directly formed on a polarizing film or a polarizing plate to obtain a circularly polarizing plate and an elliptically polarizing plate.
- An example of a circularly or elliptically polarizing plate is shown in Figure 2.
- reference numeral 20 denotes a polarizing plate.
- photoalignment operation In order to impart liquid crystal alignment ability to the photoalignable polymerizable composition layer (hereinafter abbreviated as photoalignment operation), polarized light having a wavelength that can be absorbed by the photoalignable group of compound (C) or (D) is used. Irradiation from the surface of the coating film or from the substrate side opposite to the coating film surface may be performed perpendicularly to the surface or from an oblique direction.
- the photo-alignment group is a group utilizing molecular orientation induction or isomerism reaction due to the Weigert effect
- the non-polarized light of the wavelength that the group efficiently absorbs is applied to the coating surface or From the substrate side, a liquid crystal alignment function may be given by irradiating an oblique force to the surface.
- polarized light and non-polarized light may be combined.
- the polarized light may be either linearly polarized light or elliptically polarized light, but in order to perform photoalignment efficiently, it is preferable to use linearly polarized light with a high extinction ratio.
- the non-polarized incident angle is preferably in the range of 10 ° to 80 ° with respect to the substrate normal. Considering the uniformity of the irradiation energy on the irradiated surface, the pretilt angle obtained, the alignment efficiency, etc. The range of ° to 60 ° is most preferred.
- the light to be irradiated may be light in a wavelength region in which the photoalignable group of the compound (C) or (D) has an absorption band.
- the photo-alignment group has an azobenzene structure
- ultraviolet rays having a wavelength of 350 to 500 nm having a strong absorption band due to the ⁇ ⁇ ⁇ * transition of azobenzene are particularly preferable.
- the light source for irradiation light include xenon lamps, high-pressure mercury lamps, ultra-high pressure mercury lamps, metal halide lamps, ultraviolet lasers such as KrF and ArF.
- the ultra-high pressure mercury lamp is particularly preferred because of its high emission intensity of 365 nm ultraviolet light.
- a polarizing prism such as a polarizing filter, Glan Thompson, or Dalanteller, it is possible to obtain linearly polarized ultraviolet light.
- the irradiated light is almost parallel light regardless of whether polarized light or non-polarized light is used.
- the light to be irradiated may be irradiated from the surface side of the coating film or from the substrate side. When irradiating from the substrate side, use a transparent substrate.
- the polymerization operation of the photo-alignable polymerizable composition and the polymerizable liquid crystal composition of the present invention is generally performed by irradiation with light such as ultraviolet rays or heating.
- absorption of light possessed by the compound (C) or (D) is carried out. It is preferably performed at a wavelength other than the band, for example, the absorption band of the azobenzene skeleton or the anthraquinone skeleton. Specifically, it is preferable to irradiate ultraviolet light of 320 nm or less. It is most preferable to irradiate light having a wavelength of 250 to 300 nm. This light is preferably diffused light and unpolarized light so as not to disturb the orientation of the photoalignable group already obtained.
- photopolymerization initiator known and commonly used ones can be used.
- 2-hydroxy-2-methyl-1, 1-phenolpropane-1-one (“Darocur 1173” manufactured by Merck & Co., Inc.), 1-hydroxycyclohexyl phenyl ketone (“Irgacure 18 4” manufactured by Ciba Specialty Chemicals), 1— (4-Isopropylphenol) 2 Hydroxy-2-methylpropane-1-one (Merck “Darocur 1116”), 2 Methyl 1 [ (Methylthio) phenol] 2 Moly horinopropane 1 (Chinoku 'Specialty' Chemicals "Irgacure 907"), Benzylmethyl ketal (Chinoku 'Specialty' Chemicals "Irgacure 651”), 2, 4- Jetylthioxanthone (“Kyacure DETX” manufactured by Nippon Kayaku Co., Ltd.) and
- the amount of the photopolymerization initiator used is preferably 10% by mass or less based on the composition, and particularly preferably 0.5 to 5% by mass.
- the light to be polymerized may be arbitrarily irradiated from the surface of the polymerizable liquid crystal composition layer or from the substrate side, but usually the side force to which a photopolymerization initiator is added may also be used. Irradiate.
- the polymerization by heating is preferably performed at a temperature at which the polymerizable liquid crystal composition exhibits a liquid crystal phase or lower.
- the cleavage temperature is preferably within the liquid crystal phase temperature range of the polymerizable liquid crystal composition or lower.
- the thermal polymerization initiator and the photopolymerization initiator are used in combination, the polymerization rate of the photoalignable polymerizable composition layer and the polymerizable liquid crystal composition layer is greatly different along with the limitation of the above temperature range. It is preferable to select the polymerization temperature and each initiator so that there is no problem.
- the heating temperature is preferably a temperature lower than the temperature at which inhomogeneous polymerization is induced by heat due to the force due to the transition temperature from the liquid crystal phase to the isotropic phase of the polymerizable liquid crystal composition.
- ⁇ 300 ° C is preferred 30 ° C to 200 ° C is more preferred 30 ° C to 120 ° C is particularly preferred.
- the polymerizable group is a (meth) atalyloyl group, It is preferable to carry out at a lower temperature, more preferably 30 ° C to 90 ° C.
- thermal polymerization initiator it is preferable to use a thermal polymerization initiator as appropriate.
- the thermal polymerization initiator known and commonly used ones can be used. For example, methylacetate peroxide, cumene hydride peroxide, benzoyl peroxide, bis (4 tert-butylcyclohexyl) peroxide carbonate, t Butyl peroxide benzoate, methyl ethyl ketone peroxide, 1, 1-bis (t-hexyl peroxide) 3, 3, 5 Trimethylcyclohexane, p Pentahydride peroxide, t Butylhydride peroxide, Dicumyl peroxide Organic peroxides such as 1,2 bis (t-butylperoxy) cyclohexane, 2,2'-azobisisobutyoritol-tolyl, isobutyl peroxide, di (3-methyl-3-methoxybutyl) peroxydicarbonate, 1,1bis (t) (
- the amount of the thermal polymerization initiator used is preferably 10% by mass or less, particularly preferably 0.5 to 5% by mass, based on the composition.
- the polymerization initiators such as the photopolymerization initiator and the thermal polymerization initiator shown above are included in either the photo-alignment polymerizable composition layer or the polymerizable liquid crystal composition layer having a polymerizable group. It can be included in both of them. Since the interface between the two layers is liquid, radicals generated by cleavage of the polymerization initiator and the polymerization initiator can move to both layers to some extent. Therefore, if it is contained in either layer, both layers can be polymerized simultaneously, and the optically anisotropic layer 13 in which layers (A) 11 and (B) 12 are covalently bonded and laminated. Can be obtained.
- the photo-alignable polymerizable composition does not contain a polymerization initiator, and when the polymerizable liquid crystal composition contains a polymerization initiator, the polymerization initiator is subjected to photo-alignment polymerization from the polymerizable liquid crystal composition layer. Moves slightly to the sex composition layer. Further, by applying light or heat, radicals generated in the polymerizable liquid crystal composition are transferred to the photo-alignable polymerizable composition layer, and both layers and their interfaces can be polymerized.
- the thickness of the obtained optical film 10 is preferably as thin as possible, it is easy to control the thickness and polymerization.
- the preferred thickness of one layer of the optically anisotropic layer 13 composed of the photo-alignment film and the polymerizable liquid crystal layer is preferably 0.1 to 20 / ⁇ ⁇ force S, 0.5 ⁇ : LO / zm is more preferable 1 ⁇ 5 / ⁇ ⁇ is most preferable.
- the number of laminated optical anisotropy layers 13 obtained by repeating step (I) a plurality of times, the azimuth angle with respect to incident light, and the retardation value are desired. They can be arbitrarily selected and combined according to the required characteristics of a circularly polarizing plate or an elliptically polarizing plate.
- the optically anisotropic layer 13 has 2 layers or more and 20 layers or less. Usually, 2 to 5 layers are preferred. 2 to 3 layers are practical.
- the azimuth angle can be selected arbitrarily in the range of 0 to 180 ° (0 to 180 °).
- the phase difference is determined by the purpose of use of the optical film 10 and the wavelength region used.
- the phase difference at a wavelength of 540 nm is 240 to 320 / ⁇ ⁇ for a 1Z2 wavelength plate and 120 to 160 / ⁇ ⁇ for a 1Z4 wavelength plate. It can be larger than this, but the film thickness becomes thicker.
- a combination of the optically anisotropic layer 13 having a retardation measured at a wavelength of 540 nm of 240 to 300 nm and the optically anisotropic layer 13 of 120 to 150 nm is preferable.
- the phase difference can be measured by, for example, an automatic birefringence meter.
- the vibration direction of the incident polarized light is changed. Yes, move the polarization state on any equator on the Poincare sphere (first polarization state).
- the incident light contains component light having a wavelength deviated by the 1Z2 wavelength condition force, and these light components are broad-banded by the first phase difference plate, so that the polarization state after passing through the first phase difference plate is the Boan. It must be aligned on the meridian passing through the first polarization state on the ball or at a position as close as possible.
- the first retardation plate may be composed of a single 1Z2 wavelength plate, or may be composed of a plurality of 1Z2 wavelength plates. Multiple sheets may be used, or a combination of these and a 1Z2 wave plate may be used.
- Circularly polarized light is obtained by passing the light transmitted through the first retardation plate through the 1Z4 wavelength plate and moving the polarization state to the pole on the Poincare sphere.
- this 1Z4 wavelength plate By passing through this 1Z4 wavelength plate, the difference in phase difference caused by the wavelength of the incident light generated when passing through the first phase difference plate just cancels out, and circularly polarized light in which all wavelengths of light are in the same polarization state. It becomes.
- the configuration of the first retardation plate needs to be combined so as to eliminate the phase difference for each wavelength after passing through the 1Z4 wavelength plate.
- the optical film 10 of the present invention can easily form a laminate of optically anisotropic layers 13 oriented in an arbitrary orientation direction by arbitrarily changing the irradiation direction of ultraviolet rays or the vibration direction of polarized light in (Step b). It is possible to obtain. Specifically, it is possible to obtain the optical film 10 in which the angles formed by the slow axes of the optically anisotropic layer 13 are stacked with a stacking angle error within a desired angle ⁇ 0.1 °. .
- Step a A photo-alignable polymerizable composition is applied on a long film and dried.
- Step b) Irradiation of ultraviolet rays on the layer with a directional force inclined by an azimuth angle of 75 ° (or —105 °) with respect to the longitudinal direction of the film as well as an oblique direction, for example, the normal direction force of the film is only 45 ° polar angle
- the layer (A) 11 having liquid crystal alignment ability is formed in a direction inclined by an azimuth angle of 75 ° from the longitudinal direction of the film.
- the vibration direction of polarized light is 165 ° (or ⁇ 15 ° M) from the longitudinal direction of the film to the azimuth.
- the layer (A) 11 having a liquid crystal alignment ability can be formed in a direction inclined by an azimuth angle of 75 ° from the longitudinal direction of the film, and the irradiation direction of ultraviolet rays is completely independent of the transport direction of the long film.
- it can be arbitrarily selected depending on the arrangement and structure of the irradiation device, and the accuracy of the rotation mechanism of the optical system can be easily set to 1.0 to 0.01 ° in terms of azimuth.
- Step c A liquid crystal compound whose thickness is controlled so that the phase difference becomes 1Z2 wavelength at the wavelength of incident light is applied on the obtained layer (A) 11 and oriented on the layer (A) 11.
- Step d By simultaneously polymerizing these two layers by ultraviolet irradiation, layer (A) 11 and layer (B) 12 are covalently bonded, and the slow axis tilts the film longitudinal force by 75 ° in the azimuth.
- the optically anisotropic layer 13 functioning as a 1Z2 wavelength plate can be produced.
- the irradiation direction of the ultraviolet ray in (Step b) is a direction force inclined by an azimuth angle of 15 ° (or 165 °) with respect to the longitudinal direction of the film as well as an oblique irradiation, for example, the normal direction force of the film is a polar angle. ° Tilt to irradiate. By doing so, the force in the longitudinal direction of the film is also inclined at a direction angle of 15 °, and the layer (A) 11 having the liquid crystal alignment ability in that direction can be formed.
- the longitudinal direction of the film can be irradiated even if the direction of vibration of the polarized light is 105 ° (or about 75 ° M). It is possible to form a layer (A) 11 having a liquid crystal alignment ability in a direction inclined by an azimuth angle of 15 ° with respect to the direction.
- the optically anisotropic layer 13 functions as a 1Z4 wavelength depending on the wavelength of light, whereby a broadband 1Z4 wavelength plate can be easily produced.
- a broadband circular polarizing plate can be easily formed.
- a broadband 1Z4 wavelength plate in which two layers of the optically anisotropic layer 13 functioning as a 1Z2 wavelength plate and an optically anisotropic layer 13 functioning as a 1/4 wavelength plate are laminated, and the broadband Manufacturing method of broadband circularly polarizing plate with 1Z4 wave plate and polarizing plate 20 laminated
- the UV irradiation direction in the first (step b) is such that the slow axis is azimuth 176 ° (or ⁇ 4 °) from the longitudinal direction of the film, and the film thickness of the polymerizable liquid crystal composition layer in (step c)
- the phase difference is set to 1Z2 wavelength with respect to the wavelength of the previous incident light.
- the ultraviolet irradiation direction in the second time (step b) is such that the slow axis is an azimuth angle of 154 ° (or ⁇ 26 °) from the longitudinal direction of the film, and the polymerizable liquid crystal composition layer film in (step c)
- the thickness is set so that the phase difference becomes 1Z2 wavelength at the wavelength of the previous incident light.
- the ultraviolet irradiation direction in the third time (step b) is such that the slow axis is an azimuth angle of 91 ° (or 89 °) from the longitudinal direction of the film, and the polymerizable liquid crystal composition layer film in (step c)
- the thickness is set so that the phase difference is 1Z4 wavelength compared to the wavelength of the previous incident light.
- the lamination of the optically anisotropic layer 13 in the present invention is performed by repeating the step (I) a plurality of times as described above.
- an optically isotropic resin layer may be provided between the two adjacent optically anisotropic layers 13.
- An example of the optical film 10 including the optically isotropic resin layer is shown in FIG. In FIG. 3, reference numeral 14 denotes an optically isotropic resin layer.
- the material of the optically isotropic resin layer 14 is not particularly limited, but is not limited to thermoplastic resins such as acrylic resin and polybutyl alcohol, photopolymerizable resins such as acrylic monomers, It is possible to use a polymerizable resin using heat-polymerizable resin.
- the desired viscosity of a polymer compound or high-viscosity monomer that can form a high-viscosity coating solution is 200. It is desirable to be ⁇ 20000 Pa ′ sec. More desirable is 500 to 20000 Pa ′ sec.
- the thickness of the optically isotropic resin layer 14 is not limited as long as it achieves the above-mentioned purpose.However, considering the industrial application, the thickness and the thickness of the optically isotropic resin layer 14 are desired. Is preferably 0.01 to 30 m, and more preferably 0.01 to 10 / ⁇ ⁇ .
- the optically isotropic resin layer 14 can be directly provided by applying and drying the optically isotropic resin layer on the optically anisotropic layer 13 by a coating method. If necessary, polymerization by light irradiation or heat may be performed.
- the optically isotropic resin layer 14 between the optically anisotropic layer 13 in which the adjacent layer ( ⁇ ) 11 and the layer ( ⁇ ) 12 are covalently bonded, Adhesion or adhesion, or flatness of the surface of the previous layer can be improved. Further, the optical film 10 can be produced so that different orientation directions of the adjacent optically anisotropic layers 13 do not affect. That is, since the surface orientation and surface state of the first layer ( ⁇ ) 12 can be avoided from affecting the second layer ( ⁇ ) 11, the ellipticity of the circularly polarizing plate is increased, and the elliptical polarizing plate The wavelength dependence of can be reduced. Further, it is possible to avoid interface reflection caused by a difference in refractive index between layers having anisotropy.
- a liquid crystal display element can be produced using the optical film 10 of the present invention.
- Figure 4 shows an example of this liquid crystal display element.
- reference numerals 30, 40, and 50 denote a liquid crystal layer, an alignment film, and a pixel electrode, respectively.
- the obtained optical film 10 can be bonded to an appropriate polarizing plate 20 such as a linear polarizing plate to form an elliptical polarizing plate or a circular polarizing plate.
- the polarizing plate 20 is not particularly limited, and can be combined with a polarizing film such as a silicon-based or dye-based polarizing film, or a Glan-Thompson or Glan-Teller polarizing film.
- the compound represented by the formula (1) was dissolved in a mixed solvent consisting of 2-butoxyethanol, 1-butanol, water, and ethanol to obtain a 1% by mass solid content solution.
- This solution has a pore size of 0.:m Filtered with a filter to obtain a photo-alignable polymerizable composition solution (A-1)
- the compound represented by the formula (2) was dissolved in a mixed solvent consisting of 2-butoxyethanol, 1-butanol, water and ethanol to obtain a 2% by mass solution. This solution was filtered through a filter having a pore size of 0.1 ⁇ m to obtain a photoalignable polymerizable composition solution (A-3).
- Polyburcinnamate (Aldrich molecular weight 200,000) was dissolved in NMP and a solvent with 2-butoxyethanol power to give a solid concentration solution of 1% by mass. This was designated as photoalignable polymerizable composition (A-4).
- a polymerizable liquid crystal prepared by mixing the compounds represented by formulas (4), (5), (6), (7), and (8) so that the mass ratios are 22: 18: 33: 22: 5, respectively.
- a composition was prepared, and 0.5 parts by mass of the additive (9) having a mass average molecular weight of 47,000 was mixed with 100 parts by mass of the polymerizable liquid crystal composition. Next, it was filtered with a filter having a pore size of 0. m. 96 parts of this polymerizable liquid crystal composition 4 parts of photopolymerization initiator “Irgacure 907” manufactured by Specialty Chemicals Co., Ltd. and 100 parts of xylene were mixed to obtain a polymerizable liquid crystal composition solution (B-1).
- the liquid crystal composition after xylene was evaporated from the polymerizable liquid crystal composition solution (B-1) exhibited a liquid crystal phase at 25 ° C. Therefore, in the following examples, the liquid crystal composition was used at 25 ° C.
- optical film 10 obtained in the examples shown below was measured by the following evaluation method, and the results are shown in Table 1.
- the phase difference was measured using an automatic birefringence meter (Cobra 21ADH (manufactured by Oji Scientific Instruments)) at a wavelength of 540 nm, and the wavelength dispersion of the ellipticity of the circularly polarizing plate was measured using an automatic birefringence meter (Cobra 21AD H ( Measured by the Oji Scientific Instruments Co., Ltd.)) at 477.8 nm, 545.7 nm, and 62.6 nm, and an optical film formed on a triacetyl cellulose (TAC) film.
- TAC triacetyl cellulose
- the photo-alignable polymerizable composition solution (A-1) was spin-coated to form a 20 nm thick layer. This was dried at 80 ° C and then subjected to orientation treatment, and ultraviolet rays through a 365 nm bandpass filter were irradiated for 500 sec at an intensity of 2 mWZcm 2 from a direction inclined 45 ° with respect to the layer surface, and the layer (A) 11 Formed.
- the azimuth angle indicated by the projection of the irradiated light onto the layer is 0 °.
- the polymerizable liquid crystal composition solution (B-1) is spin-coated on layer (A) 11, dried at 80 ° C, irradiated with ultraviolet light at 640 mjZcm 2 in a nitrogen atmosphere, and the phase difference measured at a wavelength of 540 nm is 270 nm.
- An optically anisotropic layer 13 was obtained.
- the surface was corona-treated, and then a 5 wt% aqueous solution of polybulu alcohol (PVA) was spin-coated and dried at 80 ° C. to provide an optically isotropic resin layer 14.
- PVA polybulu alcohol
- the photo-alignment polymerizable composition solution (A-1) and the polymerizable liquid crystal composition solution (B-1) were applied under the same conditions as described above except that the azimuth angle was 60 ° and the phase difference was 135 nm.
- the angle between the absorption axis of the polarizing plate 20 and the slow axis of the wave plate having a phase difference of 270 nm was 75 °
- the angle between the slow axis of the wave plate having the phase difference of 135 nm was 15 °. .
- the PVA impregnated with iodine and the polarizing plate 20 having a TAC force were subjected to corona treatment, and then spin-coated with the photoalignable polymer composition solution (A-1) to form a layer having a thickness of 20 nm. This is dried at 80 ° C and then subjected to orientation treatment.
- UV light through a 365-nm bandpass filter is irradiated for 500 seconds at an intensity of 2 mWZcm 2 with a directional force inclined 45 ° with respect to the layer surface, and layer (A) 11 is applied. Formed.
- the azimuth angle indicated by the projection of the irradiated light onto the layer (A) 11 is 0 °.
- a polymerizable liquid crystal composition solution (B-l) is spin-coated on top, dried at 80 ° C, irradiated with ultraviolet light at 640 mjZcm 2 in a nitrogen atmosphere, and a phase difference measured at a wavelength of 540 nm is 270 nm. Sexual layer 13 was obtained. Next, after corona treatment of this surface, a 5 wt% aqueous solution of PVA was spin-coated and dried at 80 ° C. to provide an optically isotropic resin layer 14.
- the photo-alignment polymerizable composition solution (A-1) and the polymerizable liquid crystal composition solution (B-1) were applied under the same conditions as described above except that the azimuth angle was 60 ° and the phase difference was 135 nm.
- the angle between the absorption axis of the polarizing plate 20 and the slow axis of the wave plate having a phase difference of 270 nm was 75 °
- the angle between the slow axis of the wave plate having the phase difference of 135 nm was 15 °. .
- the photo-alignable polymerizable composition solution (A-2) was spin-coated to form a 20 nm thick layer. This was dried at 80 ° C and then subjected to orientation treatment, and ultraviolet rays through a 365 nm bandpass filter were irradiated for 500 sec at an intensity of 2 mWZcm 2 from a direction inclined 45 ° with respect to the layer surface, and the layer (A) 11 Formed.
- the azimuth angle indicated by the projection of the irradiated light onto layer (A) 11 is 0 °.
- the polymerizable liquid crystal composition solution (B-1) was spin-coated on layer (A) 11, dried at 80 ° C, irradiated with ultraviolet light at 640 mjZcm 2 in a nitrogen atmosphere, and the phase difference measured at a wavelength of 540 nm was 270 nm. An optically anisotropic layer 13 was obtained. Next, after corona treatment of this surface, a 5 wt% aqueous solution of PVA was spin-coated and dried at 80 ° C. to provide an optically isotropic resin layer 14.
- a photo-alignment polymerizable composition solution (A-2) and a polymerizable liquid crystal composition solution (B-1) were applied on the same conditions as described above except that the azimuth angle was 60 ° and the phase difference was 135 nm. This was bonded on the polarizing plate 20 so that the TAC surface became a bonding surface, and a circularly polarizing plate was obtained.
- the stacking angle the angle between the absorption axis of the polarizing plate 20 and the slow axis of the wave plate with a phase difference of 270 nm was 75 °, and the angle between the slow axis of the wave plate with a phase difference of 135 nm was 15 °. .
- the photo-alignable polymerizable composition solution (A-1) was spin-coated to form a 20 nm thick layer. This is dried at 80 ° C and then subjected to orientation treatment.
- orientation treatment UV light through a 365 nm bandpass filter is irradiated at an angle of 45 ° with respect to the orientation layer surface at an intensity of 2 mWZcm 2 for 500 seconds, and layer (A) 11 is applied. Formed.
- This irradiation light layer (A) The azimuth indicated by the projection onto 11 is 0 °.
- the layer (A) 11 is spin-coated with the polymerizable liquid crystal composition solution (B 1), dried at 80 ° C, irradiated with ultraviolet light at 640 mjZcm 2 in a nitrogen atmosphere, and the phase difference measured at a wavelength of 540 nm is 270 nm. An optically anisotropic layer 13 was obtained. Next, after corona treatment of this surface, the photo-alignment polymerizable composition solution (A-1) and the polymerizable liquid crystal composition solution (B-1) under the same conditions as described above except that the azimuth angle was 60 ° and the phase difference was 135 nm. Was applied.
- the angle between the absorption axis of the polarizing plate 20 and the slow axis of the wave plate having a phase difference of 270 nm is 75 °
- the angle between the slow axis of the wave plate having the phase difference of 135 nm is 15 °. It was.
- the photo-alignable polymerizable composition solution (A-1) was continuously formed using a micro gravure coater to form a 20 nm thick layer. This was dried at 80 ° C., and then subjected to orientation treatment, and polarized ultraviolet rays through a 365 nm band-pass filter were irradiated from the normal direction of the layer surface by jZcm 2 to form layer (A) 11. At this time, the vibration direction of the polarized polarized light is inclined by 15 ° with respect to the longitudinal direction of the film.
- the polymerizable liquid crystal composition solution (B-1) was applied on layer (A) 11 using a micro gravure coater, dried at 80 ° C, irradiated with UV light at 640miZcm 2 in a nitrogen atmosphere, and measured at a wavelength of 540nm.
- An optically anisotropic layer 13 having a retardation of 270 nm and an azimuth angle of 75 ° with respect to the longitudinal direction of the slow axis film was obtained.
- this surface was subjected to corona treatment, and then the photo-alignable polymerizable composition solution (A-1) and the polymerizable liquid crystal composition solution (B-1) under the same conditions as described above except that the azimuth was 15 ° and the phase difference was 135 nm.
- the photo-alignable polymerizable composition solution (A-1) was continuously formed using a micro gravure coater to form a 20 nm thick layer. This was dried at 80 ° C., and then subjected to orientation treatment, and polarized ultraviolet rays through a 365 nm band-pass filter were irradiated from the normal direction of the layer surface by jZcm 2 to form layer (A) 11. At this time, The direction of vibration is inclined by 15 ° with respect to the longitudinal direction of the film.
- the polymerizable liquid crystal composition solution (B-1) was applied on layer (A) 11 using a micro gravure coater, dried at 80 ° C, irradiated with UV light at 640miZcm 2 in a nitrogen atmosphere, and measured at a wavelength of 540nm.
- an optically anisotropic layer 13 having a retardation of 135 nm and an azimuth angle of 75 ° with respect to the longitudinal direction of the slow axis film was obtained.
- the angle between the absorption axis of the polarizing plate 20 and the slow axis of the wave plate having a phase difference of 270 nm is 75 °
- the angle between the slow axis of the wave plate having the phase difference of 135 ⁇ m is 15 °. It was.
- the optical anisotropic layer 13 was obtained by controlling the film thickness of another TAC film so that the phase difference was 135 nm.
- a rectangular wave plate was cut out according to the shape of the polarizing plate 20, and then bonded through an adhesive. At that time, the cut-out raw material had to be discarded.
- the target stacking angle is 75 ° for the absorption axis of polarizing plate 20 and the slow axis of the 270 nm wave plate, and 15 ° for the slow axis of the 135 nm wave plate. there were.
- the photo-alignable polymerizable composition solution (A-3) was spin-coated to form a 20 nm thick layer. This is dried at 80 ° C, and then subjected to alignment treatment. UV light through a 365 nm bandpass filter is irradiated for 500 sec at an intensity of 2 mWZcm 2 from a direction inclined by 45 ° with respect to the layer surface to create a photo-alignment layer. did. The azimuth angle indicated by the projection of the irradiated light onto the photo-alignment layer is 0 °.
- the polymerizable liquid crystal composition solution (B-1) is spin-coated on the photo-alignment layer, dried at 80 ° C, irradiated with UV light at 640 mjZcm 2 in a nitrogen atmosphere, and the phase difference measured at a wavelength of 540 nm is 270 nm. An anisotropic layer 13 was obtained. Next, after corona treatment of this surface, a 5 wt% aqueous solution of PVA was spin-coated and dried at 80 ° C. to provide an optically isotropic resin layer 14.
- a photo-alignment polymerizable composition solution (A-3) and a polymerizable liquid crystal composition solution (B-1) were applied on the same conditions as described above except that the azimuth angle was 60 ° and the phase difference was 135 nm. This was bonded on the polarizing plate 20 so that the TAC surface became a bonding surface, and a circularly polarizing plate was obtained.
- the stacking angle the angle between the absorption axis of the polarizing plate 20 and the slow axis of the wave plate with a phase difference of 270 nm was 75 °, and the angle between the slow axis of the wave plate with a phase difference of 135 nm was 15 °. .
- a photoalignable polymerizable composition solution (A-1) (this is the photoalignable polymerizable composition used in Example 1) was spin-coated, and a layer having a thickness of 20 nm was formed. After drying at 80 ° C, the film was irradiated with UV light through a 365 nm bandpass filter at 45 ° to the surface of the layer at an intensity of 2 mWZcm 2 for 500 seconds to perform photo-alignment operation. A) 1 1 was formed. The azimuth angle indicated by the projection of the irradiated light onto the layer is 0 °.
- the polymerizable liquid crystal composition solution (B-1) was spin-coated on layer (A) 11, dried at 80 ° C, irradiated with ultraviolet light at 640 mjZcm 2 in a nitrogen atmosphere, and the phase difference measured at a wavelength of 540 nm was 270 nm. An optically anisotropic layer 13 was obtained.
- a 5 wt% aqueous solution of polybulal alcohol (PVA) was spin-coated and dried at 80 ° C. to provide an optically isotropic resin layer 14.
- the photo-alignment polymerizable composition solution (A-1) and the polymerizable liquid crystal composition solution (B-1) were applied under the same conditions as above except that the azimuth angle was 60 ° and the phase difference was 135 nm.
- the optical film 10 on which the optical anisotropic layer 13 was laminated was obtained.
- a glass substrate is spin-coated with a photo-alignable polymerizable composition solution (A-4), dried at 100 ° C for 2 minutes, and then irradiated with 5jZcm 2 of polarized UV light through a 313 nm bandpass filter.
- An orientation operation was performed to form layer (A) 11.
- the direction angle indicated by the direction of vibration of the irradiated polarized light is 0 °.
- the layer (A) 11 was spin-coated with the polymerizable liquid crystal composition solution (B-1), dried at 80 ° C, irradiated with 640 mjZcm 2 of ultraviolet light in a nitrogen atmosphere, and the phase difference measured at a wavelength of 540 nm was obtained.
- An optically anisotropic layer 13 having a thickness of 270 nm was obtained.
- this surface was subjected to corona treatment, and then a 5 wt% aqueous solution of PVA was spin-coated and dried at 80 ° C. to provide an optically isotropic resin layer 14.
- a photo-alignment polymerizable composition solution (A-4) and a polymerizable liquid crystal composition solution (B-1) were applied on this under the same conditions as above except that the azimuth angle was 60 ° and the phase difference was 135 nm.
- the optical film 10 on which the chemically anisotropic layer 13 was laminated was obtained.
- the transmitted light intensity is measured using an automatic birefringence meter (Cobra 21ADH (Oji Scientific Instruments)).
- the line transmittance was measured and expressed as the ratio of the transmitted light intensity in the direction inclined by 50 ° from the normal to the transmitted light intensity in the film normal direction.
- Example 7 shows an example in which the low molecular weight compound represented by the general formula (1) is used as the composition for a photo-alignment film, and the force transmission light intensity ratio is as high as 73.8%. ing.
- Example 8 is an example in which polyvinyl cinnamate having a molecular weight of 200,000 is used as a composition for a photo-alignment film. Although the transmitted light intensity ratio is relatively high, the composition is lower than that using a low-molecular-weight photo-alignment film. It is not low enough.
- Comparative Example 3 is an example in which a rubbing rosin polymer is used as the alignment film composition, but the transmitted light intensity ratio is the lowest.
- Comparative Example 4 is an example using the low molecular weight compound represented by the general formula (2), and the transmitted light intensity ratio is excellent.
- the optical film 10 of the present invention, and the circularly polarizing plate and the elliptically polarizing plate formed by laminating the optical film 10 and the polarizing plate 20 are not limited to reflective liquid crystal display devices, but are antireflective materials that suppress reflection on the surface. Can also be used as a stop film. These can be applied to touch panels, electric luminescence (EL) displays, and reflective projectors.
- EL electric luminescence
Abstract
Description
Claims
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EP05822849A EP1840604A4 (en) | 2004-12-27 | 2005-12-27 | OPTICAL FILM, PLASTIC POLARIZATION PLATE, CIRCULAR POLARIZATION PLATE, LIQUID CRYSTAL DISPLAY ELEMENT AND METHOD FOR MANUFACTURING SUCH AN OPTICAL FILM |
CA2592415A CA2592415C (en) | 2004-12-27 | 2005-12-27 | Optical film, elliptically polarizing plate, circularly polarizing plate, liquid crystal display element, and method of producing optical film |
US11/793,746 US8309187B2 (en) | 2004-12-27 | 2005-12-27 | Optical film, elliptically polarizing plate, circularly polarizing plate, liquid crystal display element, and method of producing optical film |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100266814A1 (en) * | 2007-12-21 | 2010-10-21 | Rolic Ag | Photoalignment composition |
Families Citing this family (25)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2007055189A1 (ja) * | 2005-11-08 | 2007-05-18 | Nissha Printing Co., Ltd. | 意匠パネル |
WO2009025170A1 (ja) * | 2007-08-23 | 2009-02-26 | Konica Minolta Opto, Inc. | 長尺の位相差フィルム、長尺の楕円偏光フィルム、楕円偏光板、及び画像表示装置 |
JP2009053292A (ja) * | 2007-08-24 | 2009-03-12 | Nippon Oil Corp | 楕円偏光板、その製造方法およびそれを用いた液晶表示装置 |
EP2222740B1 (en) * | 2007-12-21 | 2017-10-11 | Rolic AG | Functionalized photoreactive compounds |
CN101590784B (zh) * | 2008-05-26 | 2012-09-26 | 中国印钞造币总公司 | 复合防伪元件 |
EP2372433B1 (en) * | 2009-02-03 | 2018-04-11 | LG Chem, Ltd. | Method for manufacturing an optical filter for a stereoscopic image display device |
US8982197B2 (en) | 2009-02-03 | 2015-03-17 | Lg Chem, Ltd. | Optical filter |
KR101206723B1 (ko) | 2010-03-17 | 2012-11-30 | 주식회사 엘지화학 | 원편광판 및 이를 포함하는 반사형 액정표시장치 |
TWI425281B (zh) | 2010-12-31 | 2014-02-01 | Au Optronics Corp | 聚合物穩定配向型液晶顯示面板的製造方法 |
TWI546597B (zh) * | 2011-06-09 | 2016-08-21 | 林技術研究所股份有限公司 | 光學膜疊層體及其製造方法與使用此光學膜疊層體之液晶顯示面板 |
KR101933220B1 (ko) * | 2011-07-07 | 2018-12-27 | 스미또모 가가꾸 가부시키가이샤 | 편광 소자, 원편광판 및 이들의 제조 방법 |
CN103988121B (zh) * | 2011-12-06 | 2017-03-15 | 株式会社Lg化学 | 液晶单元 |
CN105122127B (zh) * | 2013-03-25 | 2018-06-05 | Dic株式会社 | 液晶显示元件 |
CN104212463B (zh) * | 2013-05-31 | 2016-03-16 | 京东方科技集团股份有限公司 | 取向和平坦化材料组合物,显示装置及显示颜色调整方法 |
KR102329698B1 (ko) * | 2013-08-09 | 2021-11-23 | 스미또모 가가꾸 가부시키가이샤 | 장척 원편광판의 제조 방법 및 장척 원편광판 |
KR102415449B1 (ko) | 2013-08-19 | 2022-07-01 | 롤리크 아게 | 광 정렬가능한 오브젝트 |
KR20150042640A (ko) * | 2013-10-11 | 2015-04-21 | 제일모직주식회사 | 발광물질을 포함하는 광학필름 및 이를 포함하는 백라이트 유닛 |
KR20160124867A (ko) * | 2014-03-25 | 2016-10-28 | 코니카 미놀타 가부시키가이샤 | 위상차 필름 및 그것을 사용한 편광판, 표시 장치 |
JP6667983B2 (ja) * | 2014-05-30 | 2020-03-18 | 富士フイルム株式会社 | 積層体およびその製造方法、偏光板、液晶表示装置、有機el表示装置 |
KR102356594B1 (ko) * | 2015-01-22 | 2022-01-28 | 삼성디스플레이 주식회사 | 유기 발광 표시 장치 및 그 제조 방법 |
CN104765184B (zh) * | 2015-02-13 | 2018-09-04 | 厦门天马微电子有限公司 | 液晶显示面板 |
CN111936900B (zh) * | 2018-03-29 | 2022-06-10 | 富士胶片株式会社 | 光学元件 |
JP2020024357A (ja) * | 2018-08-02 | 2020-02-13 | 住友化学株式会社 | 光学フィルム |
JPWO2020085307A1 (ja) * | 2018-10-26 | 2021-09-30 | 東洋紡株式会社 | 液晶化合物配向層転写用配向フィルム |
CN115322419B (zh) * | 2022-08-29 | 2023-08-18 | 华南师范大学 | 一种基于金纳米棒掺杂的偏振光响应型液晶聚合物网络薄膜的制备方法及其应用 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002250924A (ja) * | 2000-11-24 | 2002-09-06 | Hong Kong Univ Of Science & Technology | 光配向膜の製造方法 |
JP2003270638A (ja) * | 2002-03-14 | 2003-09-25 | Dainippon Ink & Chem Inc | 光配向膜用組成物及びこれを用いた光配向膜の製造方法 |
JP2004020701A (ja) * | 2002-06-13 | 2004-01-22 | Nippon Zeon Co Ltd | 光学積層体 |
JP2004077719A (ja) * | 2002-08-15 | 2004-03-11 | Fuji Photo Film Co Ltd | 位相差板および円偏光板 |
Family Cites Families (36)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01180090A (ja) | 1988-01-11 | 1989-07-18 | Mitsubishi Heavy Ind Ltd | 自動料金収受装置 |
SG50596A1 (en) | 1991-07-26 | 2001-01-16 | Rolic Ag | Photo-oriented polymer networks and method of their manufacture |
US6753044B2 (en) * | 1991-11-27 | 2004-06-22 | Reveo, Inc. | Coloring media having improved brightness and color characteristics |
SG50569A1 (en) * | 1993-02-17 | 2001-02-20 | Rolic Ag | Optical component |
DE59408097D1 (de) | 1993-02-17 | 1999-05-20 | Rolic Ag | Orientierungsschicht für Flüssigkristalle |
EP0656559B1 (en) | 1993-11-25 | 2002-10-16 | Fuji Photo Film Co., Ltd. | Optical compensatory sheet |
JP2641086B2 (ja) | 1993-11-25 | 1997-08-13 | 富士写真フイルム株式会社 | 光学補償シートの製造方法 |
JPH083111A (ja) | 1993-12-24 | 1996-01-09 | Dainippon Ink & Chem Inc | 重合性液晶組成物及びこれを用いた光学異方体 |
DE69419120T2 (de) | 1993-12-24 | 1999-10-28 | Dainippon Ink & Chemicals | Polymerisierbare Flüssigkristallzusammensetzung und optisch anisotroper Film, der eine solche Zusammensetzung enthält |
JP3579914B2 (ja) | 1994-04-22 | 2004-10-20 | 大日本インキ化学工業株式会社 | 光学異方性を有する基板 |
JP3579922B2 (ja) | 1994-07-14 | 2004-10-20 | 大日本インキ化学工業株式会社 | 光学異方フィルム及びそれを用いた液晶表示素子 |
EP0689084B1 (de) | 1994-06-24 | 2003-06-04 | Rolic AG | Optisches Bauelement aus Schichten vernetzter flüssigkristalliner Monomere und Verfahren zu seiner Herstellung |
US6573961B2 (en) * | 1994-06-27 | 2003-06-03 | Reveo, Inc. | High-brightness color liquid crystal display panel employing light recycling therein |
DE69634620T2 (de) | 1995-02-08 | 2006-03-02 | Fuji Photo Film Co., Ltd., Minami-Ashigara | Optische Kompensationsfolie |
JP3907735B2 (ja) | 1995-02-08 | 2007-04-18 | 富士フイルム株式会社 | 光学補償シート |
JP4006608B2 (ja) | 1997-09-05 | 2007-11-14 | 大日本インキ化学工業株式会社 | 液晶性(メタ)アクリレート化合物、該化合物を含有する組成物及びこれを用いた光学異方体 |
JP4207233B2 (ja) | 1997-11-18 | 2009-01-14 | Dic株式会社 | 液晶組成物及びこれを用いた光学異方体 |
JP4200195B2 (ja) | 1998-10-09 | 2008-12-24 | Dic株式会社 | 液晶性(メタ)アクリレート化合物、該化合物を含有する液晶組成物及びこれを用いた光学異方体 |
JP4802409B2 (ja) * | 2000-07-21 | 2011-10-26 | コニカミノルタホールディングス株式会社 | 光学補償フィルム、それを用いた偏光板及び液晶表示装置 |
JP4900632B2 (ja) | 2000-08-30 | 2012-03-21 | Dic株式会社 | 光配向膜用材料、光配向膜及びその製造方法 |
US6733958B2 (en) | 2000-08-30 | 2004-05-11 | Dainippon Ink And Chemicals, Inc. | Material for photo-alignment layer, photo-alignment layer and method of manufacturing the same |
JP2002131534A (ja) | 2000-10-19 | 2002-05-09 | Fuji Photo Film Co Ltd | 光学補償シート、偏光板および液晶表示装置 |
JP5295471B2 (ja) | 2000-11-13 | 2013-09-18 | Dic株式会社 | 重合性液晶化合物、該化合物を含有する重合性液晶組成物及びその重合体 |
US6582776B2 (en) * | 2000-11-24 | 2003-06-24 | Hong Kong University Of Science And Technology | Method of manufacturing photo-alignment layer |
JP2002205924A (ja) * | 2001-01-09 | 2002-07-23 | Kao Corp | 染毛剤 |
US7078078B2 (en) * | 2001-01-23 | 2006-07-18 | Fuji Photo Film Co., Ltd. | Optical compensatory sheet comprising transparent support and optically anisotropic layer |
TWI264604B (en) * | 2001-02-19 | 2006-10-21 | Seiko Epson Corp | Active-matrix liquid crystal display and electronic device therefor |
JP4118027B2 (ja) * | 2001-02-28 | 2008-07-16 | 株式会社日立製作所 | 液晶表示装置 |
JP4810750B2 (ja) | 2001-04-11 | 2011-11-09 | Dic株式会社 | 重合性液晶化合物、該化合物を含有する重合性液晶組成物及びその重合体 |
EP1295863A1 (en) * | 2001-09-24 | 2003-03-26 | Rolic AG | Liquid crystalline "laterally polymerizable" compounds |
EP1500957A4 (en) * | 2002-04-26 | 2008-11-19 | Epson Toyocom Corp | LAMINAT WAVE LENGTH PLATE AND OPTICAL BUYER THEREOF |
CN1296733C (zh) * | 2002-05-24 | 2007-01-24 | 日东电工株式会社 | 光学薄膜 |
JP2004077813A (ja) | 2002-08-19 | 2004-03-11 | Fuji Photo Film Co Ltd | 位相差板および円偏光板 |
EP1400838A1 (en) | 2002-09-19 | 2004-03-24 | Rolic AG | Thin films with corrugated surface topologies and method to produce them |
TWI288263B (en) * | 2002-10-17 | 2007-10-11 | Nitto Denko Corp | Liquid crystal display, optical compensator for a liquid crystal display and method of forming the same |
JP4044485B2 (ja) * | 2003-05-02 | 2008-02-06 | 日東電工株式会社 | 光学フィルム、その製造方法、およびそれを用いた偏光板 |
-
2005
- 2005-12-22 TW TW094145801A patent/TWI413809B/zh active
- 2005-12-27 KR KR1020077015326A patent/KR101215368B1/ko active IP Right Grant
- 2005-12-27 CA CA2592415A patent/CA2592415C/en active Active
- 2005-12-27 EP EP13161376.2A patent/EP2610655B1/en active Active
- 2005-12-27 EP EP05822849A patent/EP1840604A4/en not_active Withdrawn
- 2005-12-27 CN CNB2005800448303A patent/CN100555007C/zh active Active
- 2005-12-27 US US11/793,746 patent/US8309187B2/en active Active
- 2005-12-27 WO PCT/JP2005/023904 patent/WO2006077723A1/ja active Application Filing
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002250924A (ja) * | 2000-11-24 | 2002-09-06 | Hong Kong Univ Of Science & Technology | 光配向膜の製造方法 |
JP2003270638A (ja) * | 2002-03-14 | 2003-09-25 | Dainippon Ink & Chem Inc | 光配向膜用組成物及びこれを用いた光配向膜の製造方法 |
JP2004020701A (ja) * | 2002-06-13 | 2004-01-22 | Nippon Zeon Co Ltd | 光学積層体 |
JP2004077719A (ja) * | 2002-08-15 | 2004-03-11 | Fuji Photo Film Co Ltd | 位相差板および円偏光板 |
Non-Patent Citations (1)
Title |
---|
See also references of EP1840604A4 * |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100266814A1 (en) * | 2007-12-21 | 2010-10-21 | Rolic Ag | Photoalignment composition |
US9715144B2 (en) * | 2007-12-21 | 2017-07-25 | Rolic Ag | Photoalignment composition |
US10558089B2 (en) | 2007-12-21 | 2020-02-11 | Rolic Ag | Photoalignment composition |
Also Published As
Publication number | Publication date |
---|---|
KR101215368B1 (ko) | 2012-12-26 |
KR20070092723A (ko) | 2007-09-13 |
EP1840604A4 (en) | 2010-07-07 |
EP2610655A1 (en) | 2013-07-03 |
US8309187B2 (en) | 2012-11-13 |
CA2592415C (en) | 2013-05-21 |
CA2592415A1 (en) | 2006-07-27 |
CN100555007C (zh) | 2009-10-28 |
EP2610655B1 (en) | 2017-02-08 |
US20080036946A1 (en) | 2008-02-14 |
TW200628859A (en) | 2006-08-16 |
TWI413809B (zh) | 2013-11-01 |
EP1840604A1 (en) | 2007-10-03 |
CN101088035A (zh) | 2007-12-12 |
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