WO2007037317A1 - 光学機能フィルム、位相差フィルム、光学機能層形成用組成物、および、光学機能フィルムの製造方法 - Google Patents
光学機能フィルム、位相差フィルム、光学機能層形成用組成物、および、光学機能フィルムの製造方法 Download PDFInfo
- Publication number
- WO2007037317A1 WO2007037317A1 PCT/JP2006/319281 JP2006319281W WO2007037317A1 WO 2007037317 A1 WO2007037317 A1 WO 2007037317A1 JP 2006319281 W JP2006319281 W JP 2006319281W WO 2007037317 A1 WO2007037317 A1 WO 2007037317A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- optical functional
- film
- rod
- functional layer
- layer
- Prior art date
Links
Classifications
-
- 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
- G02F1/133634—Birefringent elements, e.g. for optical compensation the refractive index Nz perpendicular to the element surface being different from in-plane refractive indices Nx and Ny, e.g. biaxial or with normal optical axis
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
-
- 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
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3083—Birefringent or phase retarding elements
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2301/00—Characterised by the use of cellulose, modified cellulose or cellulose derivatives
- C08J2301/08—Cellulose derivatives
- C08J2301/10—Esters of organic acids
- C08J2301/12—Cellulose acetate
-
- 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
- G02F1/133633—Birefringent elements, e.g. for optical compensation using mesogenic materials
-
- 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
-
- 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
- G02F2202/00—Materials and properties
- G02F2202/02—Materials and properties organic material
- G02F2202/022—Materials and properties organic material polymeric
-
- 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
- G02F2202/00—Materials and properties
- G02F2202/40—Materials having a particular birefringence, retardation
Definitions
- optical functional film Optical functional film, retardation film, optical functional layer forming composition, and method for producing optical functional film
- the present invention relates to an optical functional film used for a liquid crystal display device and the like, a method for producing the same, and more specifically, has a novel arrangement form of random homogenous alignment,
- the present invention relates to an optical functional film having excellent adhesion to a substrate and excellent optical characteristics.
- Liquid crystal display devices have features such as power saving, light weight, thinness, and the like, and are rapidly spreading in recent years in place of conventional CRT displays.
- a liquid crystal display device as shown in FIG. 6, a liquid crystal display device having an incident-side polarizing plate 102A, an emitting-side polarizing plate 102B, and a liquid crystal cell 104 can be exemplified.
- the polarizing plates 102A and 102B are configured so as to selectively transmit only linearly polarized light (schematically illustrated by arrows in the figure) having a vibration surface in a predetermined vibration direction. They are placed facing each other in a cross-col state so that the directions are perpendicular to each other.
- the liquid crystal cell 104 includes a large number of cells corresponding to pixels, and is disposed between the polarizing plates 102A and 102B.
- the liquid crystal cell used in the VA liquid crystal display device since the liquid crystal molecules are vertically aligned, the liquid crystal cell as a whole has optical characteristics that act as a positive C plate. For example, if the liquid crystal cell 104 of the liquid crystal display device 100 shown in FIG. 6 has such optical characteristics, the linearly polarized light that has passed through the polarizing plate 102A on the incident side is not converted into the non-driven cell portion of the liquid crystal cell 104. At the time of transmission, the light is transmitted without being phase-shifted and blocked by the output-side polarizing plate 102B.
- the driving state When passing through the light beam, the linearly polarized light is phase-shifted, and an amount of light corresponding to the amount of the phase shift is transmitted through the exit-side polarizing plate 102B and emitted.
- the liquid crystal display device 100 is not limited to the light transmission and blocking modes described above, and the light emitted from the non-driven cell portion of the liquid crystal cell 104 is emitted from the polarizing plate on the emission side.
- a liquid crystal display device configured such that light emitted from the cell portion in the driving state is blocked by the polarizing plate 102B on the emission side while being transmitted through 102B.
- the liquid crystal cell 104 has birefringence and has a thickness. Since the refractive index in the direction and the refractive index in the plane direction are different, light incident along the normal line of the liquid crystal cell 104 out of the linearly polarized light transmitted through the polarizing plate 102A on the incident side is transmitted without being phase-shifted. Of the linearly polarized light transmitted through the polarizing plate 102A on the incident side, the light incident in the direction inclined from the normal line of the liquid crystal cell 104 has a phase difference when passing through the liquid crystal cell 104 and becomes elliptically polarized light.
- This phenomenon is caused by the fact that the liquid crystal cell 104 functions as a C plate having a liquid crystal molecular force positive alignment in the vertical direction.
- the magnitude of the phase difference generated with respect to the light transmitted through the liquid crystal cell 104 depends on the birefringence value of the liquid crystal molecules sealed in the liquid crystal cell 104, the thickness of the liquid crystal cell 104, and the transmitted light. It is also influenced by the wavelength of.
- a representative method is a method using an optical function film.
- the method using an optical functional film is as shown in Fig. 6. This is a method of improving the viewing angle problem by disposing an optical functional film 60 having a certain optical characteristic between the liquid crystal cell 104 and the polarizing plate 102B.
- a retardation film exhibiting refractive index anisotropy is used as an optical functional film used to improve such a viewing angle problem, which improves the viewing angle dependency of the liquid crystal display device described above. It is widely used as a means!
- an alignment layer 72 is provided on an arbitrary transparent substrate 71, and a retardation layer 73 having liquid crystal molecules is further formed on the alignment layer 72.
- the liquid crystal molecules are aligned by the alignment regulating force of the alignment film so that a desired refractive index anisotropy is expressed.
- a retardation film for example, as disclosed in Patent Document 1 or Patent Document 2, a retardation layer having a cholesteric regular molecular structure (a retardation layer exhibiting birefringence) is used as an alignment layer.
- Patent Document 3 discloses a retardation film in which a retardation layer composed of a discotic compound (a retardation layer exhibiting birefringence) is formed on a substrate having an alignment layer.
- the retardation film has a problem of viewing angle dependency of the liquid crystal display device by appropriately designing the refractive index anisotropy of the retardation layer so as to cancel the phase difference generated in the liquid crystal cell of the liquid crystal display device. This is useful in that it can greatly improve.
- the conventional retardation film since the conventional retardation film has an essential structure for aligning the liquid crystal molecules, there is a problem in the adhesion between the alignment layer and the retardation.
- Patent Document 4 proposes that the adhesion is improved by heat-treating the liquid crystal and the alignment layer.
- the base material is a base material with low moisture and heat resistance that is not a glass substrate (for example, TAC)
- the base material expands and contracts due to the influence of moisture, and the liquid crystal layer peels off due to the influence.
- Another problem is that uneven interference occurs due to multiple reflections between the layers due to the alignment layer.
- a retardation film having a function as a negative C plate is usually used as a method for improving the viewing angle dependency of the liquid crystal display device adopting the VA method using a retardation film.
- Two layers of retardation film that functions as A plate or B plate A method using a phase difference film is used as a method of using such two retardation films.
- a liquid crystal cell 104 as shown in FIG. 8 (a) a retardation film 61 having a function as a negative C plate, and an A plate And a retardation film 61 having a function as a negative C plate on the polarizing plate 102A on the incident side as shown in FIG.
- a method of laminating the retardation film 62 having a function as a plate has been used.
- a method for improving the viewing angle dependency problem using such two retardation films is a liquid crystal using liquid crystal cells having various optical characteristics by changing the combination of the retardation films. This is useful in that the problem of the viewing angle dependency of the display device can be improved.
- two retardation films are used, there are problems that the thickness of the liquid crystal display device is increased and the manufacturing method is complicated.
- the retardation film as shown in FIG. 7 is generally used.
- the retardation film having such a configuration has a problem in the adhesion between the alignment layer and the retardation that is useful in that the alignment layer is used to facilitate alignment of liquid crystal molecules.
- the present inventors have formed a base material and a random homogenous film directly on the base material as a retardation film capable of expressing desired optical characteristics without using an alignment film.
- a retardation film having an optical functional layer with an oriented rod-like compound has excellent adhesion between the optical functional layer and the substrate, and the optical functional layer having the above-mentioned random homogeneously oriented rod-like composite is negative. It is useful in that it exhibits excellent optical properties as a C-plate, and it has been attracting attention as a material that is superior in quality to conventional retardation films in terms of durability and stability of optical properties.
- the retardation film having no alignment film as described above usually forms an optical functional layer containing the rod-shaped compound on a base material having a property as a negative C plate.
- Patent Document 1 JP-A-3-67219
- Patent Document 2 JP-A-4 322223
- Patent Document 3 Japanese Patent Laid-Open No. 10-312166
- Patent Document 4 Japanese Patent Laid-Open No. 2003-207644
- the present invention has been made in view of the above problems, and can exhibit excellent optical characteristics without using an alignment film, and has excellent adhesion between layers and excellent display quality.
- the main purpose is to provide a performance film.
- the present invention has an optically negative C plate property without using an alignment layer, or an optically A plate or B plate property, and a negative C plate property.
- the main object is to provide a retardation film.
- the main object of the present invention is to provide a composition for forming an optical functional layer capable of forming an optical functional layer having excellent transparency.
- the present invention includes a base material having properties as an optically negative C plate, and an optical functional layer formed on the base material and having a rod-shaped compound.
- An optical functional film wherein the optical functional layer is formed directly on the substrate, and the rod-like compound forms a random homogeneous orientation in the optical functional layer, An optical functional film is provided.
- the above-mentioned optical functional layer is directly formed on the substrate having the property as an optically negative C plate, whereby the adhesion between the substrate and the optical functional layer is improved. Since it can be strengthened, an optical functional film having excellent adhesion can be obtained as compared with an optical functional film having a conventional alignment layer.
- the rod-like compound forms a random homogeneous orientation, whereby the optical functional layer is excellent in refractive index anisotropy and Can be highly transparent.
- the base material in the direction of thickness (Rth) 1S 20nm ⁇ l It is preferably within the range of OOnm.
- the thickness direction letter-thickness (Rth) of the substrate is within the above range, random homogenous orientation is formed in the optical functional layer regardless of the type of the rod-shaped compound. It is because it becomes easy to do.
- the Rth of the substrate is within the above range, a homogeneous random homogenous orientation can be formed.
- the base material has triacetyl cellulose strength. Since triacetyl cellulose has a molecular structure having a relatively bulky side chain, it is based on the rod-like compound that forms the optical functional layer by constituting a substrate such as triacetyl cellulose. This is because it becomes easy to penetrate into the material, and the adhesion between the base material and the optical functional layer can be further improved. In addition, triacetyl cellulose easily exhibits the property as an optically negative C plate, and therefore, it is easy to form a random homogenous orientation of the rod-like compound. .
- the rod-shaped compound preferably has a polymerizable functional group. Since the rod-shaped compound has a polymerizable functional group, the rod-shaped compound can be polymerized and fixed, so that the rod-shaped compound is in a state of forming a random homogenous orientation. This is because, by fixing, it is possible to obtain an optical functional film that is excellent in alignment stability and hardly changes in optical characteristics.
- the rod-like compound is preferably a liquid crystal material.
- the optical functional layer can be made excellent in the expression of optical characteristics per unit thickness.
- the liquid crystalline material is preferably a material exhibiting a nematic phase. This is because when the liquid crystalline material is a material exhibiting a nematic phase, random homogeneous alignment can be formed more effectively.
- the thickness of the optical functional layer is preferably in the range of 0.5 / z ⁇ to 10 / ⁇ m. This is because if the thickness of the optical functional layer is larger than the above range, depending on the kind of the rod-like compound, it may be difficult to form a random homogenous alignment. In addition, if the thickness of the optical function layer is thinner than the above range, the optical function layer may not be able to exhibit the necessary optical characteristics, and there is a possibility.
- the present invention provides a retardation film using the optical functional film and having a retardation (Rth) 1S in the thickness direction of the optical functional film in the range of 50 nm to 400 nm. According to the present invention, for example, to improve the viewing angle characteristics of a VA (Vertical Alignment) type liquid crystal display element by using the optical film and having a thickness direction retardation (Rth) within the above range. A suitable retardation film can be obtained.
- VA Vertical Alignment
- in-plane letter decision (Re) force ⁇ ! It is preferably in the range of ⁇ 5 nm. Since the in-plane letter retardation (Re) is within the above range, the retardation film of the present invention is suitable for improving the viewing angle characteristics of, for example, a VA (Vertical Alignment) type liquid crystal display element. This is because it can be used as a retardation film.
- VA Vertical Alignment
- the present invention comprises a substrate having the properties as an A plate or a B plate and a property as a negative C plate, and a retardation layer containing a rod-shaped compound.
- a retardation film wherein the retardation layer is formed directly on the substrate, and the rod-like composite forms a random homogenous orientation in the retardation layer.
- a retardation film is provided.
- the substrate and the retardation layer are formed.
- a retardation film excellent in adhesion can be obtained as compared with a retardation film having a conventional alignment layer.
- the retardation layer acts as a negative C plate. It can be made excellent in the expression of characteristics. Optical characteristics that act as an A plate or B plate as a whole by laminating such a retardation layer on a substrate having properties as an A plate or B plate and a negative C plate, It can exhibit optical properties that act as a negative C plate. Therefore, according to the present invention, a retardation film that contributes to thinning of the liquid crystal display device can be obtained.
- the in-plane letter-deposition (Re) force of the substrate is 30 nm to 200 nm. Preferred to be in range.
- the retardation film of the present invention can be made to have excellent properties as an A plate.
- the thickness direction letter-thickness (Rth) force of the substrate is preferably in the range of 10 nm to 15 Onm.
- the rod-like composite contained in the retardation layer has a force capable of forming a more homogeneous random homogenous alignment. .
- the substrate has a cycloolefin polymer (COP) force. Since the cycloolefin polymer has low moisture absorption and permeability, the substrate used in the present invention also has a cycloolefin polymer (COP) force, which makes the retardation film of the present invention optical characteristics. This is because it can be made excellent in stability over time.
- COP cycloolefin polymer
- the rod-like composite has a polymerizable functional group. Since the rod-shaped compound has a polymerizable functional group, it becomes possible to superimpose and fix the rod-shaped compound, so that the rod-shaped compound forms a random homogenous orientation. By fixing the film in a state where it is in a state, it is possible to obtain a retardation film that is excellent in alignment stability and hardly changes in optical characteristics.
- the rod-like compound is preferably a liquid crystal material. This is because when the rod-shaped compound is a liquid crystalline material, the retardation layer can be made to have excellent optical properties per unit thickness.
- the liquid crystalline material is preferably a material exhibiting a nematic phase. Since the liquid crystalline material is a material exhibiting a nematic phase, it is a force capable of forming a random homogenous alignment more effectively.
- the thickness of the retardation layer is preferably within a range of 0.3 ⁇ m to 10 ⁇ m. This is because if the thickness of the retardation layer is larger than the above range, it may be difficult to form a random homogenous orientation depending on the kind of the rod-shaped compound. In addition, if the thickness of the retardation layer is thinner than the above range, it may not be possible to develop necessary optical characteristics in the retardation layer.
- the retardation film of the present invention has an in-plane letter decision (Re) force of 30 ⁇ ! ⁇ 200nm range It is preferable to be within. Because the in-plane letter retardation (Rth) is within the above range, for example, a retardation film suitable for improving the viewing angle characteristics of a VA (Vertical Alignment) type liquid crystal display device can be obtained. is there.
- the retardation film of the present invention preferably has a thickness direction letter-thickness (Rth) force in the range of 50 nm to 300 nm. Since the retardation (Rth) in the thickness direction is within the above range, for example, a retardation film suitable for improving the viewing angle characteristics of a VA (Vertical Alignment) type liquid crystal display device can be obtained. It is.
- Rth letter-thickness
- the present invention provides a composition for forming an optical functional layer comprising a rod-like compound and a mixed solvent comprising an alcohol solvent and another organic solvent,
- a composition for forming an optical functional layer characterized in that the amount of alcohol solvent in the mixed solvent is in the range of 5 to 20% by mass.
- the optical functional layer when the optical functional layer is formed using the composition for forming an optical functional layer of the present invention by including an alcoholic solvent in the above range in the mixed solvent, white turbidity is formed.
- An optical functional layer having no transparency and excellent transparency can be formed.
- the composition for forming an optical functional layer is preferably used for forming an optical functional layer in which the rod-shaped compound has formed a random homogenous alignment.
- the optical functional layer in which the above rod-like compound forms a random homogenous alignment can exhibit optical characteristics as a negative C plate even without an alignment film. This is because the optical functional layer can be formed by directly coating the composition for forming an optical functional layer, whereby an optical functional layer having excellent adhesion to the substrate can be formed.
- the rod-like compound has a polymerizable functional group. Since the rod-shaped compound has a polymerizable functional group, the rod-shaped compound can be polymerized and fixed. Therefore, using the composition for forming an optical functional layer of the present invention, alignment stability and optical characteristics In other words, it is possible to form an excellent optical functional layer.
- the rod-like composite is preferably a liquid crystalline material.
- the rod-like composite is a liquid crystalline material
- the liquid crystalline material is preferably a material exhibiting a nematic phase. Since the liquid crystalline material is a material exhibiting a nematic phase, an optical functional layer in which a rod-like compound has a more uniform random homogeneity orientation using the optical functional layer forming composition of the present invention. It is because it can form.
- the present invention uses a substrate having properties as a negative C plate and the composition for forming an optical functional layer, and coats the composition for forming an optical functional layer on the substrate.
- a substrate having properties as a negative C plate and the composition for forming an optical functional layer and coats the composition for forming an optical functional layer on the substrate.
- a method for producing a functional film is provided.
- an optical functional film having an optical functional layer having excellent transparency can be produced by forming an optical functional layer using the composition for forming an optical functional layer.
- optical functional layer directly on the substrate, an optical functional film having excellent adhesion between the optical functional layer and the substrate can be produced.
- the optical functional film produced according to the present invention since the rod-shaped composite forms a random homogenous orientation, the optical functional film produced according to the present invention has optical characteristics. In particular, it has excellent optical properties that act as a negative C plate.
- the present invention has an effect that it is possible to obtain an optical functional film that can exhibit excellent optical properties without using an alignment film and that has excellent adhesion between the optical functional layer and the substrate. .
- the present invention has an optical characteristic that acts as an optically negative C plate or an optically A plate or B plate and a negative C plate with a single film without using an alignment layer. If a retardation film that can be expressed and has excellent adhesion between the retardation layer and the substrate can be obtained, it has a remarkable effect.
- composition for forming an optical functional layer of the present invention an optical function excellent in transparency. There exists an effect that a layer can be formed.
- FIG. 1 is a schematic perspective view showing an example of an optical functional film of the present invention.
- FIG. 2 is a schematic sectional view showing another example of the optical functional film of the present invention.
- FIG. 3 is a schematic perspective view showing an example of the retardation film of the present invention.
- FIG. 4 is a schematic cross-sectional view showing an example of how the retardation film of the present invention is used.
- FIG. 5 is a schematic cross-sectional view showing another example of usage of the retardation film of the present invention.
- FIG. 6 is a schematic view showing an example of a general liquid crystal display device.
- FIG. 7 is a schematic sectional view showing an example of a conventional retardation film.
- FIG. 8 is a schematic cross-sectional view showing an example of a liquid crystal display device using two retardation films. Explanation of symbols
- optical functional film The optical functional film, retardation film, optical functional layer forming composition, and method for producing the optical functional film of the present invention are described in detail below.
- the optical functional film of the present invention comprises a substrate having properties as an optically negative C plate, and an optical functional layer formed on the substrate and having a rod-shaped compound, and the optical function
- the layer is directly formed on the base material, and the rod-like compound has a random homogenous orientation in the optical functional layer.
- FIG. 1 is a schematic perspective view showing an example of the optical functional film of the present invention.
- the optical functional film 10 of the present invention has a base material 1 and an optical functional layer 2 directly formed on the base material 1.
- the substrate 1 has properties as an optically negative C plate
- the optical functional layer 2 is a rod-like composite that forms random homogenous alignment.
- the optical functional film 10 of the present invention has the optical functional layer 2 directly formed on the substrate 1, and is essential for a conventional optical functional film as shown in FIG. This is a component that does not have an alignment layer.
- the substrate and the optical functional layer can be firmly adhered to each other.
- delamination does not occur over time.
- adhesion there are also advantages such as improved alkali resistance and reworkability.
- the adhesion mechanism between the two is improved by directly forming the optical functional layer on the substrate due to the following mechanism. That is, the optical functional layer directly on the substrate As a result, the rod-like molecules contained in the optical functional layer can permeate into the base material from the surface of the base material, so that there is no clear interface at the bonding portion between the base material and the optical functional layer. , Both forces ⁇ mixed "form. For this reason, it is considered that the adhesion is remarkably improved as compared with the adhesion by the conventional interface interaction.
- the random homogenous alignment in the present invention is an alignment state formed by the rod-shaped compound contained in the optical functional layer. By having such an alignment state, the optical functional film of the present invention has excellent optical characteristics. It can be made.
- the random homogenous orientation of the rod-like compound in the present invention has at least the following three characteristics. That is, the random homogeneity orientation in the present invention is:
- the arrangement direction of the rod-like compound is random (hereinafter simply referred to as “irregularity”).
- the size of the domain formed by the rod-like compound in the optical functional layer is smaller than the wavelength in the visible light region (hereinafter sometimes simply referred to as “dispersibility”)
- the rod-like compound is in-plane oriented (hereinafter sometimes simply referred to as “in-plane orientation”),
- FIG. 2 (a) is a schematic view when the optical functional film of the present invention is viewed from the direction perpendicular to the surface of the optical functional layer represented by A in FIG. Figure 2 (b)
- (C) is a cross-sectional view taken along line BB ′ in FIG. 2 (a).
- the “irregularity” possessed by the random homogeneous orientation in the present invention will be described with reference to FIG.
- the above-mentioned “irregularity” means that when the force perpendicular to the surface of the optical functional layer 2 is viewed from the optical functional film 10 according to the present invention, the optical functional layer 2 has a rod shape. This indicates that Compound 3 is randomly arranged.
- the molecular major axis direction (hereinafter referred to as molecular axis) represented by a in FIG. Shall. Therefore, the arrangement direction of the rod-like compound is random means that the molecular axis a of the rod-like compound 3 included in the optical functional layer is randomly oriented.
- the direction of the molecular axis a is random as a whole even when the rod-like compound has a cholesteric structure.
- the “irregularity” in the present invention does not include a form resulting from a cholesteric structure.
- the above “dispersibility” indicates that the size of the domain b is visible when the rod-like compound 3 forms the domain b in the optical functional layer 2. This indicates that it is smaller than the wavelength of the light region.
- the smaller the size of the domain the more preferable, and the state where the rod-like compound is dispersed as a single molecule is the most preferable.
- the “in-plane orientation” possessed by the random homogeneous orientation in the present invention will be described with reference to FIG.
- the above-mentioned “in-plane orientation” indicates that the rod-like compound 3 in the optical functional layer 2 has a molecular axis a with respect to the normal direction A of the optical functional layer 3. It means to be oriented vertically.
- the “in-plane orientation” means that the molecular axes a of all the rod-like compounds 3 in the optical functional layer 2 are substantially perpendicular to the normal direction A as shown in FIG. 2 (b). For example, as shown in FIG.
- a rod-like compound 3 having a molecular axis a ′ perpendicular to the normal direction A is present in the optical functional layer 2 as shown in FIG. Even if it exists in the optical functional layer 3, This includes the case where the average direction of the molecular axis a of the rod-shaped compound 3 is substantially perpendicular to the normal direction A.
- the random homogenous alignment in the present invention is characterized by at least "irregularity”, “dispersibility”, and “in-plane alignment”.
- the optical function film strength of this characteristic can be confirmed by the following method.
- the rod-like compound is randomly oriented by Re evaluation of the optical functional layer constituting the optical functional film of the present invention, and the rod-like compound does not form a cholesteric structure depending on the presence or absence of the selective reflection wavelength. Can be confirmed.
- the in-plane letter retardation (Re) value of the optical functional layer indicates that the orientation state of the rod-like composite is random. It can be confirmed by being within the range.
- the in-plane letter decision (Re) force of the optical functional layer ⁇ ! It is preferable to be within a range of ⁇ 5 nm.
- Re is a surface It is a parameter indicating the refractive index difference in the inward direction.
- the refractive index in a specific direction increases, so that the refractive index difference tends to increase.
- the refractive index in a specific direction does not increase in the plane of the optical functional layer, and thus the refractive index difference tends to be small. . Therefore, the “irregularity” can be evaluated by evaluating Re indicating such a difference in refractive index.
- the Re of the optical functional layer can be obtained, for example, by subtracting Re indicated by a layer other than the optical functional layer from Re of the optical functional film. That is, the Re of the optical functional layer can be obtained by performing Re measurement on the whole optical functional film and the optical functional film obtained by cutting the optical functional layer, and subtracting the latter Re from the former Re force. Re can be measured, for example, by the parallel-coll rotation method using KOBRA-WR manufactured by Oji Scientific Instruments.
- the rod-like compound does not have a cholesteric structure because, for example, an ultraviolet-visible gold-infrared spectrophotometer (UV-3100, etc.) manufactured by Shimadzu Corporation is used, and the optical functional layer in the present invention is used. However, it can be evaluated by confirming that it does not have a selective reflection wavelength. This is because, in the case of having a cholesterol structure, it has a selective reflection wavelength that depends on the helical pitch of the cholesteric structure.
- UV-3100, etc. ultraviolet-visible gold-infrared spectrophotometer
- the haze value of the optical functional layer constituting the optical functional film of the present invention is within a range indicating that the size of the domain of the rod-shaped compound is not more than the wavelength in the visible light region. Can be confirmed.
- the haze value of the optical function layer is preferably in the range of 0% to 5%.
- the haze value of the optical functional layer can be obtained, for example, by subtracting the haze value of a layer other than the optical functional layer from the haze value of the optical functional film. That is, the haze value of the entire optical functional film and the optical functional film obtained by cutting the optical functional layer is measured, and the haze value of the optical functional layer is subtracted from the former haze value. Can be requested.
- the above haze value is measured according to JIS K7105. The specified value shall be used.
- haze has the above “dispersibility”, that is, the size of the domain formed by the rod-shaped compound is smaller than the wavelength in the visible light region. Based on the reason. That is, when the rod-shaped compound forms a domain and the size of the domain is larger than the wavelength of visible light, visible light is scattered in the optical functional layer, so that the optical functional layer It tends to become cloudy. Therefore, the “dispersibility” can be evaluated by measuring the haze of the optical functional layer in the visible light region.
- the specific size of the domain in the present invention is preferably not more than the wavelength of visible light, that is, not more than 380 nm, particularly preferably not more than 350 nm. It is preferably 200 nm or less.
- the lower limit value of the domain size is the size of a single molecule of the rod-like compound. The size of such a domain can be evaluated by observing the optical functional layer with a polarizing microscope, AFM, SEM, or TEM.
- the above “in-plane orientation” means that the Re value of the optical functional layer constituting the optical functional film of the present invention is in the above-mentioned range, and the optical functional layer in the present invention is an optically negative C plate. It can be confirmed by having a letter direction (Rth) value in the thickness direction showing the properties of In particular, the thickness direction letter-thickness (Rth) of the optical functional layer in the present invention is preferably in the range of 50 nm to 400 nm.
- the Rth value represents a retardation value in the thickness direction, and the refraction in the fast axis direction (the direction in which the refractive index is the smallest) in the plane of the optical functional layer constituting the optical functional film of the present invention.
- the refractive index Nx the refractive index in the slow axis direction (the direction in which the refractive index is the largest)
- the refractive index Nz in the thickness direction the thickness d (nm) of the optical functional layer
- Rth ⁇ (Nx + Ny ) Z2—Nz ⁇ is a value represented by the formula d.
- the Rth value in the present invention indicates the absolute value of the value represented by the above formula.
- the reason why the above-mentioned “in-plane orientation” can be confirmed by Re and Rth is based on the following reason. That is, Rth is a parameter resulting from the difference between the average value of the refractive index in the in-plane direction and the refractive index in the thickness direction, as is clear from the above definition.
- the Re value of the optical functional layer shows a value within a certain range from the above “irregularity”
- the Rth value depends on the refractive index (Nz) in the thickness direction. Become.
- the refractive index (Nz) in the thickness direction tends to decrease due to the in-plane orientation of the rod-like composite
- the Rth value tends to increase in this case. Therefore, when the Rth value of the optical functional layer is within the above range, the “in-plane orientation” can be evaluated.
- the Rth of the optical functional layer can be obtained, for example, by subtracting Rth indicated by a layer other than the optical functional layer from Rth of the optical functional film. That is, the Rth of the entire optical functional film and the optical functional film cut out from the optical functional layer can be measured, and the Rth of the optical functional layer can be obtained by subtracting the latter Rth from the former Rth.
- Rth can be measured by, for example, a parallel Nicole rotation method using KOBRA-WR manufactured by Oji Scientific Instruments.
- the optical functional film of the present invention has a base material and an optical functional layer directly formed on the base material.
- the configuration of the optical functional film of the present invention will be described in detail.
- the optical functional layer in the present invention is directly formed on a substrate described later.
- the optical functional layer in the present invention contains a rod-like compound, and the rod-like compound forms a random homogenous orientation.
- excellent optical characteristics can be exhibited even in the optical functional film of the present invention having no orientation layer.
- Rod-shaped compound The rod-shaped compound used in the present invention will be described below.
- the rod-shaped compound used in the present invention is not particularly limited as long as it can form a random homogeneous orientation in the optical functional layer.
- the “rod-like compound” in the present invention refers to a compound in which the main skeleton of the molecular structure is rod-shaped, and examples of the compound having such a rod-like main skeleton include azomethines, , Cyanobiphenyls, cyanophylesters, benzoic acid esters, cyclohexanecarboxylic acid ester, cyanophanecyclohexanes, cyanogen substituted vinyl birimidines, alkoxy substituted phenolic birimidines, Mention may be made of cyclohexyl dioxanes, tolanes and alkyl cyclohexyl benzo-tolyls. In addition, it is possible to use not only the above-mentioned low molecular liquid crystalline compounds but also high molecular liquid crystalline compounds.
- the rod-like compound used in the present invention is preferably a compound having a relatively small molecular weight.
- a compound having a molecular weight within a range of 200 to 1200, particularly within a range of 400 to 800 is preferably used.
- the rod-like compound easily penetrates into the base material described later, so that it becomes easy to form a “mixed” state at the bonding site between the base material and the optical functional layer. This is because the adhesion to the functional layer can be improved.
- a rod-like composite material that has a polymerizable functional group, which will be described later, and is polymerized in the optical functional layer indicates the molecular weight before polymerization.
- the rod-like composite used in the present invention is preferably a liquid crystalline material exhibiting liquid crystallinity. This is because, when the rod-like composite is a liquid crystalline material, the optical functional layer can be made excellent in the expression of optical characteristics per unit thickness.
- the rod-like compound in the present invention is preferably a liquid crystalline material exhibiting a nematic phase among the above liquid crystalline materials. A liquid crystalline material exhibiting a nematic phase has a relatively easy force to form a random homogenous alignment.
- the liquid crystalline material exhibiting the nematic phase is preferably a molecule having spacers at both ends of the mesogen. Since the liquid crystalline material having spacers at both ends of the mesogen is excellent in flexibility, it can effectively prevent the optical functional layer in the present invention from becoming cloudy. Because you can.
- the rod-like compound used in the present invention those having a polymerizable functional group in the molecule are suitably used, and those having a polymerizable functional group capable of three-dimensional crosslinking are particularly preferable. Since the rod-like compound has a polymerizable functional group, the rod-like compound can be polymerized and fixed. Therefore, the rod-like compound forms a random homogeneous orientation. This is because, by fixing in the state, an optical functional film having excellent alignment stability and hardly causing changes in optical properties can be obtained. In the present invention, the rod-like compound having a polymerizable functional group and the rod-like compound having no polymerizable functional group may be used in combination.
- three-dimensional crosslinking means that liquid crystalline molecules are polymerized in three dimensions to form a network structure.
- polymerizable functional groups that are polymerized by the action of ionizing radiation such as ultraviolet rays and electron beams, or heat are not particularly limited.
- Representative examples of these polymerizable functional groups include radical polymerizable functional groups or cationic polymerizable functional groups.
- radically polymerizable functional groups include functional groups having at least one addition-polymerizable ethylenically unsaturated double bond, and specific examples include a bull group having or not having a substituent.
- an allylate group (generic name including an allyloyl group, a methacryloyl group, an attaryloxy group, and a methacryloyloxy group).
- cationic polymerizable functional group examples include an epoxy group.
- examples of the polymerizable functional group include an isocyanate group and an unsaturated triple bond. Among these, from the viewpoint of the process, a functional group having an ethylenically unsaturated double bond is preferably used.
- the rod-like compound in the present invention is particularly preferably a liquid crystalline material exhibiting liquid crystallinity and having the polymerizable functional group at the terminal.
- a liquid crystalline material exhibiting liquid crystallinity and having the polymerizable functional group at the terminal.
- nematic liquid crystalline materials having polymerizable functional groups at both ends they can be polymerized three-dimensionally to form a network structure, having alignment stability, and optical properties. It is possible to obtain an optical functional layer that is excellent in the expression of mechanical characteristics. Further, even those having a polymerizable functional group at one end can be cross-linked with other molecules to stabilize the sequence.
- Such a rod-shaped compound The compounds represented by the following formulas (1) to (6) can be illustrated as c
- H 2 C CHCOO "(CH 2 + 0- 3 (5)
- the liquid crystalline materials represented by the chemical formulas (1), (2), (5), and (6) are DJ. Broer et al., Makromol. Chem. 190,3201-3215 (1989), or DJ. It can be prepared according to or similar to the method disclosed in Broer et al., Makromol. Chem. L90, 2250 (1989). In addition, the preparation of the liquid crystalline material represented by the chemical formulas (3) and (4) is disclosed in DE 195,04,224.
- nematic liquid crystalline material having an acrylate group at the terminal include:
- H 2 C CHC0O -fcH 2 -)-0-C0O- -CN (8)
- H3 ⁇ 4C CHC00- (CH2-)-0 (12)
- H2C CHC00- (CH2 ⁇ -C -COO— /) ij ⁇ CH Z CH (CH 3 ) C 2 H 5 (13)
- H2C CHC00- (CH2 ⁇ 0- (14)
- g integer from 2 to 5
- the above bar-like compound may be used alone or in combination of two or more.
- the rod-like compound when a liquid crystal material having one or more polymerizable functional groups at both ends and a liquid crystal material having one or more polymerizable functional groups at one end are mixed and used,
- the point power that can arbitrarily adjust the polymerization density (crosslinking density) and optical characteristics by adjusting the blending ratio of the two is also preferable.
- the optical functional layer in the invention may contain other compounds in addition to the rod-shaped compound.
- Such other compounds are not particularly limited as long as they do not disturb the random homogenous orientation of the rod-like compound.
- Examples of such other compounds include polymerizable materials generally used for hard coating agents.
- Examples of the polymerizable material include polyester (meta) obtained by reacting (meth) acrylic acid with a polyester prepolymer obtained by condensing a polyhydric alcohol and a monobasic acid or polybasic acid.
- Atalylate Polyurethane obtained by reacting a compound having a polyol group and two isocyanate groups with each other, and then reacting the reaction product with (meth) acrylic acid; (meth) acrylate; bisphenol Type A epoxy resin, bisphenol F type epoxy resin, novolac type epoxy resin, polycarboxylic acid polyglycidyl ester, polyol polyglycidyl ether, aliphatic or cycloaliphatic epoxy resin, amino group epoxy resin Epoxy resin such as fat, triphenol methane type epoxy resin, dihydroxybenzene type epoxy resin, and (meth) Photopolymerizable compounds such as epoxy (meth) atrelate obtained by reacting acrylic acid; photopolymerizable liquid crystalline compounds having an acrylic group or
- the thickness of the optical functional layer in the present invention is not particularly limited as long as it is within a range in which desired optical characteristics can be imparted to the optical functional layer according to the kind of the rod-shaped compound.
- the thickness of the optical functional layer is preferably in the range of 0.5 ⁇ m to 10 ⁇ m, and particularly preferably in the range of 0.5 ⁇ m to 5 ⁇ m. In particular, it is particularly preferably within the range of 1 ⁇ m to 3 ⁇ m. If the thickness of the optical functional layer is larger than the above range, “in-plane orientation”, which is one of the features of random homogenous orientation, is impaired, and the desired optical characteristics may not be obtained. Because there is.
- the thickness of the mixed functional region is the thickness of the optical functional layer. Shall not be included.
- the retardation (Re) of the optical functional layer is ⁇ ! As described above from the viewpoints of “irregularity” and “in-plane orientation” possessed by the random homogenous orientation. Even within the range of ⁇ 5 nm, ⁇ ! Especially in the range of ⁇ 3nm ⁇ ! Within the range of ⁇ In m is preferable.
- Re value and the measurement method are as described above, description thereof is omitted here.
- the optical functional layer in the present invention has a value (ReZd) force obtained by dividing the retardation value (Re (nm)) of the optical functional layer by the thickness (d (m)) of the optical functional layer. It is preferable to be within the range of 2, particularly preferably within the range of 0 to 0.1, particularly preferably within the range of 0 to 0.05.
- the thickness direction retardation (Rth) of the optical functional layer in the present invention is 50 nm to 400 nm as described above from the viewpoint of "in-plane orientation" possessed by the random homogenous orientation.
- the range of 50 nm to 300 nm is preferable, and the range of 50 nm to 200 nm is particularly preferable.
- the definition of Rth value and the measuring method are as described above, the description thereof is omitted here.
- the optical functional layer in the present invention has a value (Rth / d) force obtained by dividing the retardation value (Rth (nm)) in the thickness direction of the optical functional layer by the thickness (dm) of the optical functional layer.
- Rth / d the retardation value obtained by dividing the retardation value (Rth (nm)) in the thickness direction of the optical functional layer by the thickness (dm) of the optical functional layer.
- the haze of the optical functional layer in the present invention is preferably in the range of 0% to 5% as described above from the viewpoint of "dispersibility" provided by the random homogenous alignment.
- the range of 0% to 1% is preferable, and the range of 0% to 0.5% is particularly preferable.
- the definition of haze and the measurement method are as described above, and thus the description thereof is omitted here.
- the configuration of the optical functional layer in the present invention is not limited to a configuration composed of a single layer, and may have a configuration in which a plurality of layers are stacked. Has a configuration in which multiple layers are stacked In this case, layers having the same composition may be stacked, or a plurality of layers having different compositions may be stacked. In the case where the optical functional layer is composed of a plurality of layers, at least the optical functional layer directly laminated on the substrate may have a rod-like compound in which random homogenous alignment is formed.
- the substrate used in the present invention has a function as an optically negative C plate.
- the optical functional film of the present invention is such that the optical functional layer is directly formed on the substrate, so that the rod-like compound contained in the optical functional layer is randomly homogenized. Therefore, the base material used in the present invention also has a function as a so-called alignment film for forming the above-mentioned rod-shaped composite material into a random homogenous alignment.
- the base material used in the present invention will be described.
- the substrate used in the present invention is not particularly limited as long as it has properties as an optically negative C plate.
- the substrate having the property as an optically negative C plate is used for the present invention. That is, as described above, the base material in the present invention functions as a so-called alignment film for the above rod-like compound to form a random homogeneous alignment, but the base material is optically negative. Without the properties of the C-plate, the rod-like compound cannot produce a random homogenous orientation.
- the rod-like compound is randomly formed by forming an optical functional layer containing the rod-like compound on a substrate having properties as an optically negative C plate.
- the mechanism for forming a homogeneous orientation is not clear, but is thought to be based on the following mechanism.
- the base material when the base material is formed from a polymer material, the base material Is an optically negative c-plate, the polymer material constituting the substrate is considered to be randomly arranged without specific regularity in the in-plane direction.
- the rod-like compound When the rod-like compound is applied onto a substrate having a polymer material randomly arranged in the in-plane direction on the surface, the rod-like compound partially penetrates into the substrate and the molecular axes are randomly arranged. It is thought that they are arranged along the molecular axis of the polymer material. With such a mechanism, it is considered that a substrate having an optically negative c-plate exhibits a function as an alignment film for forming a random homogenous alignment.
- the base material is considered to have a function as an alignment film for forming the random homogenous orientation of the rod-like composite, and therefore the base material used in the present invention.
- Those having a structure that cannot contact the constituent material of the base material cannot be used as the base material in the present invention.
- a support made of only a polymer material and having a function as an optically negative C plate, and a refractive index anisotropy on the support are described.
- examples thereof include a base material having a configuration in which retardation layers containing an optically anisotropic material are stacked.
- the polymer material constituting the support is a constituent material of the base material having an orientation regulating force for the rod-like compound, but the optical functional layer is provided on the retardation layer.
- the rod-like composite cannot contact the polymer material due to the presence of the retardation layer. Therefore, the base material having such a configuration is not included in the base material in the present invention even if it has the property as an optically negative c plate! /.
- the thickness direction letter-thickness (Rth) force of the substrate is preferably in the range of 20 nm to 100 nm. In particular, the range of 25 nm to 80 nm is preferable, and the range of 30 nm to 60 nm is preferable.
- the thickness direction letter-thickness (Rth) of the substrate is within the above range, it is easy to form random homogenous alignment in the optical functional layer regardless of the type of the rod-shaped compound. Because it becomes. Further, when the Rth of the substrate is within the above range, it is a force capable of forming a homogeneous random homogenous alignment.
- in-plane letter retardation (Re) 1S Onm to 300 nm It is especially preferable to be in ⁇ ! It is preferable to be within the range of Onm to 125 nm, especially within the range of ⁇ 150 nm! /.
- the transparency of the substrate used in the present invention may be arbitrarily determined according to the transparency required for the optical functional film of the present invention, but usually the transmittance in the visible light region is 80% or more. It is more preferable that it is 90% or more. This is because if the transmittance is low, the selection range of the rod-shaped composite material may be narrowed.
- the transmittance of the base material can be determined according to JIS K7361-1 (test method for the total light transmittance of a single plastic transparent material).
- the thickness of the substrate used in the present invention is not particularly limited as long as it has the necessary self-supporting property depending on the use of the optical functional film of the present invention, etc.
- the internal force S in the range of ⁇ 188 ⁇ m is preferable, particularly the internal force S in the range of 20 m to 125 m is preferable. This is because if the thickness of the substrate is thinner than the above range, the self-supporting property required for the optical functional film of the present invention may not be obtained. Further, if the thickness is thicker than the above range, for example, when cutting the optical functional film of the present invention, processing waste may increase or the cutting blade may be worn quickly. .
- the thickness of the optical functional layer is the above-mentioned mixed thickness.
- the thickness of the joint region is included.
- the base material used in the present invention may be a flexible material having flexibility or a rigid material having no flexibility as long as it has the above optical characteristics. It is preferable to use a material.
- the manufacturing process of the optical functional film of the present invention can be a roll-to-roll process, and an optical functional film excellent in productivity can be obtained.
- Examples of the flexible material include cellulose derivatives, norbornene-based polymers, cyclohexylene-based polymers, polymethylmetatalylate, polybutyl alcohol, polyimide, polyarylate, polyethylene terephthalate, polysenolephone, polyethenores norephone, and dimolefas polyolefine.
- a cellulose derivative among those that can exemplify modified acrylic polymers, polystyrene, epoxy resin, polycarbonate, polyesters and the like. This is because the cellulose derivative is particularly excellent in optical isotropy, so that an optical functional film having excellent optical properties can be obtained.
- cellulose derivative it is preferable to use a cellulose ester.
- cellulose esters Of the cellulose esters, cellulose acylates are preferably used. Since cellulose acylates are widely used industrially, they are advantageous in terms of availability.
- lower fatty acid esters having 2 to 4 carbon atoms are preferred.
- the lower fatty acid ester may include only a single lower fatty acid ester such as cellulose acetate, and may include a plurality of lower fatty acid esters such as cellulose acetate butyrate or cellulose acetate propionate. It may be anything.
- cellulose acetate can be particularly preferably used among the above-mentioned lower fatty acid esters.
- the cellulose acetate it is most preferable to use triacetyl cellulose having an average acetylation degree of 57.5 to 62.5% (substitution degree: 2.6 to 3.0). Since triacetyl cellulose has a molecular structure having a relatively bulky side chain, by forming a base material such as triacetyl cellulose cover, the rod-like compound formed on the base material forms the optical functional layer. Because it penetrates easily, the adhesion between the base material and the optical functional layer is further improved. It is also the power that can be done.
- the degree of acetic acid means the amount of bound acetic acid per unit mass of cellulose.
- the degree of acetylation can be determined by measuring and calculating the degree of acetylation in ASTM: D-817-91 (Testing method for cellulose acetate, etc.).
- the acetylation degree of the triacetyl cellulose constituting the triacetyl cellulose film can be obtained by the above method after removing impurities such as a plasticizer contained in the film.
- Examples of the norbornene-based polymer include a cycloolefin polymer (COP) and a cycloolefin copolymer (COC).
- COP cycloolefin polymer
- COC cycloolefin copolymer
- the structure of the substrate in the present invention is not limited to a structure composed of a single layer, and may have a structure in which a plurality of layers are laminated. In the case of a configuration in which a plurality of layers are stacked, layers having the same composition may be stacked, or a plurality of layers having different compositions may be stacked.
- Examples of the structure of the base material on which a plurality of layers having different compositions are laminated include, for example, a film made of a material that randomly orientates the above rod-like composite such as triacetyl cellulose, water permeability and self Examples of lamination with a support having excellent supportability can be given.
- the optical functional film of the present invention is characterized in that the optical functional layer is directly formed on the base material, the rod-shaped compound contained in the optical functional layer penetrates the base material, and the base material and optical A mixed region in which both are “mixed” is formed in the adhesive portion with the functional layer.
- the thickness of such a mixed region is not particularly limited as long as it can form the above-mentioned random homogenous alignment and can bring the adhesive strength between the base material and the optical functional layer into a desired range. Yes.
- the thickness of the mixed region is 0.1 ⁇ ! It is preferable to be within the range of ⁇ 10 m, especially within the range of 0.5 ⁇ m to 5 ⁇ m, even within the range of 1 ⁇ m to 3 ⁇ m. preferable.
- the rod-like compound distribution state in the mixed region can form the random homogeneous alignment, and the adhesion between the substrate and the optical functional layer is within a desired range.
- the distribution state of the rod-like composite is a force that can exemplify an aspect that exists uniformly in the thickness direction of the base material and an aspect that has a concentration gradient in the thickness direction of the base material. Therefore, the mode of deviation can also be suitably used.
- the optical functional film of the present invention may have other layers in addition to the substrate and the optical functional layer.
- examples of such other layers include an antireflection layer, an ultraviolet absorption layer, an infrared absorption layer, and an antistatic layer.
- the antireflection layer used in the present invention is not particularly limited.
- a layer obtained by forming a low refractive index layer made of a substance having a lower refractive index than the transparent substrate on a transparent substrate film Alternatively, on the transparent base film, a high refractive index layer having a higher refractive index than that of the transparent base, and a low refractive index layer having a lower refractive index than that of the transparent base, in this order, Alternately, one or more of each layer are stacked.
- These high refractive index layer and low refractive index layer are vacuum-deposited so that the optical thickness represented by the product of the geometric thickness of the layer and the refractive index is 1Z4 of the wavelength of light to be prevented from being reflected. It is formed by coating or the like.
- the constituent material of the high refractive index layer titanium oxide, zinc sulfide or the like is used, and as the constituent material of the low refractive index layer, magnesium fluoride, cryolite or the like is used.
- the ultraviolet absorbing layer used in the present invention is not particularly limited.
- a film formed by adding an ultraviolet absorber that also has strength is mentioned.
- the infrared absorbing layer used in the present invention is not particularly limited. Examples thereof include an infrared ray absorbing layer formed on a film substrate such as polyester resin by coating or the like.
- a film substrate such as polyester resin by coating or the like.
- an infrared absorbing layer for example, an infrared absorbing agent composed of a di-in-molybdenum compound, a phthalocyanine compound or the like is added to a binder resin made of acrylic resin, polyester resin or the like to form a film. Things are used.
- antistatic layer used in the present invention for example, various types having a cationic group such as a quaternary ammonium salt, a pyridine-um salt, and a primary to tertiary amino group.
- Nonionic antistatic agent such as amino alcohol type, glycerin type, polyethylene glycol type, etc .
- Polymer type antistatic agent with high molecular weight of the above antistatic agent Tertiary amino group quaternary ammo Monomers and oligomers having a -um group and polymerizable by ionizing radiation such as N, N-dialkylaminoalkyl (meth) acrylate monomers, polymerizable antistatic agents such as quaternary compounds thereof, etc. It can be mentioned those formed by adding an antistatic agent.
- the thickness of the optical functional film of the present invention is not particularly limited as long as it is within a range in which desired optical characteristics can be expressed, but is usually within the range of 10 / ⁇ ⁇ to 200 / ⁇ ⁇ . In particular, the range of 20 m to 100 m is preferable.
- the optical functional film of the present invention preferably has a haze value measured in accordance with JIS K7105 in the range of 0% to 5%, particularly in the range of 0% to 1%. In particular, it is preferably in the range of 0% to 0.5%.
- the application of the optical functional film of the present invention is not particularly limited and can be used for various applications as an optical functional film.
- Specific applications of the optical functional film of the present invention include, for example, an optical compensator (for example, a viewing angle compensator) used in a liquid crystal display device, an elliptically polarizing plate, and a luminance improving plate.
- an optical compensator for example, a viewing angle compensator
- it can be used as a negative C plate.
- it when used as an optical compensator having a negative C plate, it is suitably used for a liquid crystal display device having a liquid crystal layer such as a VA mode or an OCB mode.
- the optical functional film of the present invention is bonded to a polarizing layer to thereby obtain a polarizing film. It can also be used for applications.
- a polarizing film is usually formed by forming a polarizing layer and protective layers on both surfaces thereof.
- the protective layer on one side as the above-described optical functional film, for example, liquid crystal A polarizing film having an optical compensation function for improving the viewing angle characteristics of the display device can be obtained.
- the polarizing layer is not particularly limited.
- an iodine polarizing layer, a dye polarizing layer using a dichroic dye, a polyen polarizing layer, or the like can be used.
- the iodine-based polarizing layer and the dye-based polarizing layer are generally produced using polyvinyl alcohol.
- the optical functional film of the present invention may be used after being subjected to a stretching treatment.
- An embodiment in which such stretching treatment is performed is not particularly limited, and examples thereof include a mode in which the optical functional film of the present invention is subjected to stretching treatment and used as a biaxial film.
- the method for producing an optical functional film of the present invention is not particularly limited as long as it is a method capable of forming an optical functional layer having random homogenous orientation on the substrate, but usually on the substrate, A method of coating the composition for forming an optical functional layer prepared by dissolving the rod-shaped compound in a solvent is used. According to such a method, the rod-shaped compound can be infiltrated into the base material together with the solvent, so that the interaction between the rod-shaped compound and the material constituting the base material can be enhanced. As a result, it is easy to form a random homogenous orientation of the rod-like compound.
- a method for producing such an optical functional film will be described.
- the composition for forming an optical functional layer is usually composed of a rod-like compound and a solvent, and may contain other compounds as necessary.
- the rod-shaped compound and the base material used in the optical functional layer forming composition are the same as those described in the above sections “1. Optical functional layer” and “2. Base material”. The description in is omitted.
- the solvent used in the composition for forming an optical functional layer is not particularly limited as long as it can dissolve the rod-like compound in a desired concentration.
- examples of the solvent used in the present invention include hydrocarbon solvents such as benzene and hexane, methyl ethyl ketone, and methyl.
- Ketone solvents such as ruisobutyl ketone and cyclohexanone, ether solvents such as tetrahydrofuran, 1,2-dimethoxyethane, halogenated alkyl solvents such as chloroform and dichloromethane, methyl acetate, butyl acetate, propylene glycol monomethyl
- ester solvents such as ether acetate, amide solvents such as N, N dimethylformamide, and sulfoxide solvents such as dimethyl sulfoxide is not limited to these.
- the solvent used in the present invention may be one type or a mixed solvent of two or more types of solvents.
- cyclohexane is preferably used, although it is preferable to use a ketone solvent.
- the content of the rod-shaped compound in the composition for forming an optical functional layer depends on the coating method for applying the optical functional layer formation on a substrate, etc. If it is in the range which can make a viscosity into a desired value, it will not be limited especially.
- the content of the rod-like compound is preferably in the range of 0.1% by mass to 60% by mass in the composition for forming an optical functional layer, particularly 1% by mass to 50%. Of these, the range of 10% by mass to 40% by mass is preferable.
- the composition for forming an optical functional layer may contain a photopolymerization initiator as necessary.
- a photopolymerization initiator when a treatment for curing the optical functional layer by ultraviolet irradiation is performed, it is preferable to include a photopolymerization initiator.
- photopolymerization initiator used in the present invention examples include benzophenone, o methyl benzoylbenzoate, 4,4-bis (dimethylamine) benzophenone, 4,4 bis (jetinoreamine) benzophenone, ataminoaminoacetophenone, 4,4-dichloro Benzophenone, 4-benzoyl 4-methyldiphenyl ketone, dibenzyl ketone, fluorenone, 2, 2-diethoxyacetophenone, 2, 2-dimethoxy-2-phenylacetophenone, 2-hydroxy 2-methylpropiophenone, p --Tert-butyldichloroacetophenone, thixanthone, 2-methylthioxanthone, 2-chlorothioxanthone, 2-isopropylthixanthone, jetylthioxanthone, benzyldimethyl ketal, benzylmethoxyethylacetal, benzoin methyl ether, Benzoin
- a photopolymerization initiation assistant can be used in combination.
- photopolymerization initiation assistants include tertiary amines such as triethanolamine and methyljetanolamine, and benzoic acid derivatives such as 2-dimethylaminoethylbenzoic acid and 4-dimethylamidobenzoate.
- the power S that can be, is not limited to these.
- composition for forming an optical functional layer compounds as shown below can be added within a range not impairing the object of the present invention.
- compounds that can be added include polyester (meth) acrylates obtained by reacting poly (alcohol) with a polyester polymer obtained by condensing a monobasic acid or a polybasic acid with (meth) acrylic acid; Polyurethane (meth) acrylate obtained by reacting a compound having one group and two isocyanate groups with each other and then reacting the reaction product with (meth) acrylic acid; bisphenol A type epoxy resin, Bisphenol F type epoxy resin, novolak type epoxy resin, polycarboxylic acid polyglycidyl ester, polyol polyglycidyl ether, aliphatic or cycloaliphatic epoxy resin, amino group epoxy resin, triphenol methane type Epoxy A photopolymerizable compound such as epoxy (meth) acrylate obtained by reacting an epoxy resin such as fat or dihydroxybenzene type epoxy resin with
- composition for forming an optical functional layer may contain other compounds than the above, if necessary.
- Other compounds are not particularly limited as long as they do not impair the optical properties of the optical functional layer according to the use of the optical functional film of the present invention.
- the coating method for coating the composition for forming an optical functional layer on the alignment layer is not particularly limited as long as the desired planarity can be achieved. Specifically, the Dara via coating method, reverse coating method, knife coating method, dip coating method, spray coating method, air knife coating method, spin coating method, roll coating method, printing method, immersion pulling method, curtain coating method, die coating Force that can exemplify the method, casting method, bar coating method, etching coating method, E-type coating method, etc.
- the thickness of the coating film of the composition for forming an optical functional layer is not particularly limited as long as the desired flatness can be achieved, but usually 0.1 m to 50 ⁇ m.
- the range of m is preferable. Particularly, the range of 0.5 ⁇ to 30 / ⁇ ⁇ is preferable, but the range of 0.5 m to 10 ⁇ m is preferable. If the thickness of the coating film of the composition for forming an optical functional layer is smaller than the above range, the planarity of the optical functional layer may be impaired. If the thickness is larger than the above range, the drying load of the solvent increases and This is because the performance may deteriorate.
- a drying method for drying the coating film of the composition for forming an optical functional layer a commonly used drying method such as a heat drying method, a reduced pressure drying method, a gap drying method, or the like can be used.
- the drying method in the present invention is not limited to a single method, and a plurality of drying methods may be employed, for example, by changing the drying method sequentially in accordance with the amount of solvent remaining.
- the method for polymerizing the polymerizable material is not particularly limited, and the type of polymerizable functional group possessed by the polymerizable material is not particularly limited. What is necessary is just to determine arbitrarily according to it.
- a method of curing by irradiation with actinic radiation is preferable.
- the actinic radiation is not particularly limited as long as it is a radiation capable of polymerizing the polymerizable material, but usually ultraviolet light or visible light is used from the viewpoint of the ease of equipment. However, it is preferable to use irradiation light having a wavelength of 150 to 500 nm, preferably 250 to 450 nm, more preferably 300 to 400 nm.
- low-pressure mercury lamp (sterilization lamp, fluorescent chemical lamp, black light), high-pressure discharge lamp (high-pressure mercury lamp, metal nitride lamp), short arc discharge lamp (ultra-high pressure mercury lamp, Examples include xenon lamps and mercury xenon lamps). Among these, use of metal halide lamps, xenon lamps, high-pressure mercury lamps, etc. is recommended.
- the irradiation intensity can be appropriately adjusted according to the content of the photopolymerization initiator.
- the retardation film of the present invention will be described.
- the retardation film of the present invention can be roughly divided into two embodiments according to the embodiment. Therefore, hereinafter, the retardation film of the present invention will be described in order for each embodiment.
- B-1 Retardation film of first aspect
- the retardation film of the first embodiment of the present invention will be described.
- the optical functional film described in the section “A. Optical functional film” is used, and the retardation (Rth) in the thickness direction of the optical functional film is 50 ⁇ ! It is characterized by being in the range of ⁇ 400 nm.
- the optical functional film of the present invention is converted into VA (Vertical Alignment). It is possible to obtain a retardation film suitable for improving the viewing angle characteristics of the liquid crystal display device of the type.
- the above Rth is in the range of 100 nm to 300 nm.
- the retardation film of this embodiment has an in-plane letter-deposition (Re) force Onm to 5 nm. It is preferable to be within the range.
- the retardation film of this embodiment is suitable for improving the viewing angle characteristics of VA (Vertical Alignment) type liquid crystal display elements. It is because it can be used as.
- the in-plane letter-deposition (Re) value may have wavelength dependency.
- the long wavelength side may have a mode in which the Re value is larger than the short wavelength side
- the short wavelength side may have a mode in which the Re value is larger than the long wavelength side. Due to the wavelength dependence of the Re value, for example, when the retardation film of this embodiment is used for improving the viewing angle characteristics of the liquid crystal display element, the viewing angle characteristics of the liquid crystal display element are entirely observed in the visible light region. It is the power that can improve.
- the Re is in the range of Onm to 3nm.
- optical functional film used in this embodiment is the same as that described in the above section "A. Optical functional film", and thus the description thereof is omitted here.
- the method for producing the retardation film of the present embodiment is not particularly limited as long as it is a method capable of exhibiting the above optical characteristics.
- the method for producing an optical functional film of the above "A. Optical functional film” It can be produced by the method described in the section.
- the retardation film of this embodiment is a retardation film having a substrate having properties as an A plate or B plate and a property as a negative C plate, and a retardation layer containing a rod-shaped compound.
- the retardation layer is directly formed on the base material, and the rod-like composite in the retardation layer forms a random homogeneous orientation. is there.
- FIG. 3 is a schematic perspective view showing an example of the retardation film of this embodiment.
- the retardation film 20 of this embodiment has a base material 21 and a retardation layer 22 directly formed on the base material 21.
- the substrate 21 is an A plate or a B plate. It has the properties of a gate and the properties of a negative C plate.
- the retardation layer 22 includes a rod-like compound 23 that forms a random homogeneous orientation.
- the retardation film 20 of this embodiment has a retardation layer 22 directly formed on a substrate 21, and has an alignment layer that is an essential constituent element in a conventional retardation film. That is what constitutes.
- the retardation film of this embodiment can form a retardation layer directly on the substrate, thereby allowing the substrate and the retardation layer to be firmly adhered to each other. , It has the advantage of excellent adhesion stability. In addition, with such improved adhesion, there are also advantages such as improved alkali resistance and reworkability.
- directly formed means that the base material and the retardation layer are in direct contact between the base material and the retardation layer, for example, through another layer such as an alignment layer. It means that it is formed as follows.
- the adhesion mechanism between the two is improved by the direct formation of the retardation layer on the substrate due to the following mechanism. That is, by forming the retardation layer directly on the base material, the rod-like molecules contained in the retardation layer can penetrate into the base material from the surface of the base material. It is considered that there is no clear interface at the bonded portion, and the two are “mixed”. For this reason, it is considered that the adhesion is remarkably improved as compared with the conventional adhesion by the interface interaction.
- the retardation film of this embodiment does not have an alignment layer, and the adhesive portion between the substrate and the retardation layer is in a “mixed” state! There is no interface. Therefore, the retardation film of this embodiment has an advantage that the above-described multiple reflection does not occur and the quality is not deteriorated due to interference unevenness.
- the substrate used in this embodiment has the characteristics of being an A plate or a B plate, and the property as an A plate in this embodiment is specifically the in-plane letter data of the substrate. It means that Chillon (Re) is 30nm or more.
- a value measured by an automatic birefringence measuring apparatus (trade name: KOBRA-21ADH, manufactured by Oji Scientific Instruments) is used.
- the property as the B plate in the present embodiment is that the relationship of Nx> Ny> Nz is established for Nx, Ny, and Nz.
- the base material used in the present embodiment has the characteristic of having a property as a negative C plate.
- the "property as a negative C plate" in the present embodiment is specifically based on This means that the letter direction (Rth) in the thickness direction of the material is lOnm or more.
- the thickness direction letter decision (Rth) in this embodiment is a value measured by an automatic birefringence measuring apparatus (trade name: KOBRA-21ADH, manufactured by Oji Scientific Instruments).
- the random homogenous orientation in the present embodiment is the same as that described in the above-mentioned section "A. Optical function film”, and thus the description thereof is omitted here.
- the retardation film of the present invention comprises a base material having the properties as the A plate or B plate and the property as a negative C plate, and a rod-like composite formed with the random homogenous orientation. And a retardation layer containing an object.
- the retardation layer of the present invention is excellent in the expression of optical characteristics that act as a negative C plate by a rod-like compound having a random homogenous orientation.
- FIGS. 4 (a) and 4 (b) are schematic cross-sectional views showing an example of a liquid crystal display device using a conventional A plate and negative C plate
- FIG. 4 (c) is a diagram of the present invention. It is a schematic sectional drawing which shows an example of the liquid crystal display device with which the phase difference film was used.
- the retardation film of the present invention for example, the functions of the A plate 61 and the negative C plate 62 used in FIGS. 4 (a) and (b). This can be achieved by a single sheet using the retardation film 20 of the present invention (FIG. 4C), and thus has the advantage that the liquid crystal display device can be thinned.
- the retardation film of this embodiment has a base material and a retardation layer directly formed on the base material.
- the retardation layer which comprises the retardation film of this aspect is demonstrated.
- the retardation layer in this embodiment is directly formed on the substrate described later.
- the phase difference layer in this aspect can adhere
- the retardation layer in this embodiment includes a rod-shaped compound, and forms the above-described rod-shaped compound force S random homogenous alignment.
- the retardation film of this embodiment can be made to have excellent optical properties that act as a negative C plate.
- the rod-shaped compound used in this embodiment will be described.
- the rod-shaped compound used in this embodiment is not particularly limited as long as it can form a random homogenous alignment in the retardation layer.
- rod-like composite used in this embodiment is the same as that described in the section “A. Optical Function Film” above, and thus the description thereof is omitted here.
- the retardation layer in this embodiment may contain other compounds in addition to the rod-shaped compound.
- Such other compounds are not particularly limited as long as they do not disturb the random homogenous orientation of the rod-like compound.
- Such other compounds include photopolymerization initiation Agents, polymerization inhibitors, leveling agents, chiral agents, silane coupling agents and the like.
- the thickness of the retardation layer in this embodiment is not particularly limited as long as it is within a range in which desired optical characteristics can be imparted to the retardation layer, depending on the kind of the rod-shaped compound.
- the thickness of the retardation layer is in the range of 0.5 ⁇ m to 10 ⁇ m, and in particular, it is in the range of 0.5 ⁇ m to 8 ⁇ m. In particular, it is preferably within a range of 0.5 ⁇ m to 6 ⁇ m. If the thickness of the retardation layer is larger than the above range, the “in-plane orientation”, which is one of the characteristics of random homogeneous alignment, is impaired, and the desired optical characteristics may not be obtained. It is. On the other hand, if the thickness is smaller than the above range, the target optical characteristics may not be obtained depending on the type of the rod-shaped compound.
- the thickness of the retardation layer is as follows. Not included.
- the in-plane letter retardation (Re) of the retardation layer in the present embodiment is On as described above from the viewpoint of "irregularity" and "in-plane orientation" possessed by the random homogenous alignment.
- the preferred ranges of m to 5 nm is Onm to 3 nm, and particularly preferred is Onm ⁇ : Lnm.
- the definition of Re value and the measurement method are as described above, description thereof is omitted here.
- the retardation (Rth) in the thickness direction of the retardation layer in this embodiment is 50 ⁇ ! As described above from the viewpoint of the “in-plane orientation” possessed by the random homogenous orientation.
- the range of ⁇ 400 nm the range of 100 nm to 300 nm is preferred, and the range of 100 nm to 200 nm is particularly preferred.
- the definition of Rth value and the measuring method are as described above, the description thereof is omitted here.
- the haze of the retardation layer in this embodiment is preferably in the range of 1% or less as described above from the viewpoint of “dispersibility” possessed by the random homogenous alignment.
- the definition of haze and the measurement method are as described above, and thus the description thereof is omitted here.
- the configuration of the retardation layer in the present embodiment is not limited to a configuration consisting of a single layer. , A plurality of layers may be stacked. In the case of a configuration in which a plurality of layers are stacked, layers having the same composition may be stacked, or a plurality of layers having different compositions may be stacked.
- the retardation layer is composed of a plurality of layers, it is sufficient that at least the retardation layer directly laminated on the substrate has a rod-like compound having a random homogenous orientation.
- the substrate used in this embodiment has properties as an A plate or B plate and a property as a negative C plate.
- the retardation layer is directly formed on the substrate, so that the rod-shaped composite contained in the retardation layer forms a random homogeneous orientation. Therefore, the base material used in this embodiment also has a function as a so-called alignment film for the above rod-like composite to form random homogenous alignment.
- the base material used in this embodiment will be described.
- the reason for using the A plate or B plate property as the base material used in this embodiment is to provide the retardation film of this embodiment with a function as an A plate or B plate.
- the reason why the base material used in this embodiment has a property as a negative C plate is that the retardation film of this embodiment is provided with a function as a negative C plate, and the retardation described above. This is because the rod-like composite is randomly homogeneously oriented in the layer.
- the base material in this embodiment is a force that functions as a so-called alignment film for the rod-like composite to form a random homogenous orientation.
- the base material serves as a negative C plate.
- the rod-like compound cannot form a random homogenous orientation. Therefore, the reason for using the material having the properties as the negative C plate is the latter in particular. This is for a reason.
- the rod-shaped compound is randomly homogenized.
- the mechanism that forms the layer is not clear, it is thought to be based on the following mechanism. That is, for example, considering the case where the base material is formed from a polymer material cover, when the base material has a property as a negative C plate, the polymer material constituting the base material is oriented in the in-plane direction. It is thought that they are randomly arranged without specific regularity.
- the rod-like compound When the rod-like compound is applied on a substrate having a polymer material randomly arranged in the in-plane direction on the surface, the rod-like compound partially penetrates into the substrate and the molecular axis is random. It is thought that the polymer material is arranged along the molecular axis of the polymer material. With such a mechanism, it is considered that a substrate having a negative C plate exhibits a function as an alignment film for forming a random homogeneous alignment.
- the base material is considered to have a function as an alignment film for forming a random homogenous orientation of the rod-like composite, and therefore the base material used in this embodiment is It must have a structure in which the constituent material of the base material that has an orientation regulating force for the rod-like compound and exhibits the properties as a negative C plate exists on the surface of the base material. Therefore, even if the substrate has properties as a negative C plate, when the phase difference layer is formed on the substrate, the rod-shaped compound has an alignment regulating force with respect to the rod-shaped compound. Those having a structure that cannot be in contact with the constituent materials cannot be used as the base material in this embodiment.
- Examples of such a substrate that cannot be used in this embodiment include a support made of only a polymer material and having a function as a negative C plate, and an optical material having refractive index anisotropy on the support.
- Examples thereof include a base material having a configuration in which retardation layers containing an isotropic material are laminated.
- the polymer material constituting the support is a constituent material of the base material having an orientation regulating force for the rod-shaped compound, but the retardation layer is formed on the base material. In this case, due to the presence of the retardation layer, the rod-like compound cannot contact the polymer material. Therefore, a substrate having such a configuration is not included in the substrate in this embodiment even if it has the properties of a negative C plate.
- the substrate used in this embodiment is not particularly limited as long as it has properties as an A plate or B plate and a property as a negative C plate.
- the above-mentioned properties of the base material as the A-plate are particularly effective when the in-plane letter-deposition (Re) is 30 nm or more.
- Re in-plane letter-deposition
- it is preferably in the range of 30 nm to 250 nm, more preferably in the range of 30 nm to 200 nm, particularly in the range of 30 nm to l 50 nm. It is preferable.
- Re of the base material used in the present embodiment is within the above range, the retardation film of the present embodiment can be made to have excellent properties as an A plate. Note that the definition of the in-plane letter decision and the measurement method are the same as described above, and a description thereof is omitted here.
- the properties of the base material used in this embodiment as the B plate are not particularly limited as long as the above-mentioned Nx, Ny, and Nz of the base material have a relationship of Nx> Ny> Nz.
- Letter-thickness (Rth) force in the thickness direction of the substrate is preferably in the range of 30 nm to 200 nm, more preferably in the range of 30 nm to 170 nm, particularly preferably in the range of 30 nm to 140 nm. .
- the in-plane letter-deposition (Re) force of the substrate is preferably in the range of 10 nm to 200 nm, more preferably in the range of 10 nm to 150 nm, and particularly in the range of 10 nm to lOOnm. I like it! /
- the property of the base material used in this embodiment as a negative C plate is not particularly limited as long as the thickness direction letter-deposition (Rth) is lOnm or more as described above.
- the range of 10 nm to 250 nm is preferable, the range of 25 nm to 200 nm is preferable, and the range of 40 nm to 150 nm is particularly preferable.
- the rod-like composite contained in the phase difference layer has a force capable of forming a more uniform random homogenous orientation. is there.
- the definition of the letter direction (Rth) in the thickness direction and the measuring method are the same as those described above, and thus the description thereof is omitted here.
- the transparency of the substrate used in the present embodiment may be arbitrarily determined according to the transparency required for the retardation film of the present embodiment, but usually the transmittance in the visible light region is 80% or more. It is more preferable that it is 90% or more. If the transmittance is low, the above bar This is because there is a case where the selection range of the state compound is narrowed.
- the transmittance of the base material can be measured according to JIS K7361-1 (Testing method of total light transmittance of a single plastic transparent material).
- the thickness of the substrate used in the present embodiment is not particularly limited as long as it has the necessary self-supporting property, depending on the use of the retardation film of the present embodiment.
- the range of 10 ⁇ m to 188 ⁇ m is preferable, particularly the range of 20 m to 125 m is preferable, and the range of 30 ⁇ m to 100 ⁇ m is particularly preferable. preferable.
- the thickness of the substrate is thinner than the above range, the self-supporting property required for the retardation film of this embodiment may not be obtained.
- the thickness is thicker than the above range, for example, when cutting the retardation film of this embodiment, the processing waste may increase or the cutting blade may wear faster. .
- the thickness of the retardation layer is the thickness of the mixed region. Shall be included.
- a flexible material that can be used is either a flexible material having flexibility or a rigid material having no flexibility. Is preferably used.
- the materials constituting the flexible material are the same as those described in the section “A. Optical functional film”, and thus the description thereof is omitted here.
- the base material used in this embodiment is preferably subjected to a stretching treatment.
- the rod-shaped composite material easily penetrates into the base material, and therefore, the adhesion between the base material and the retardation layer is more excellent, and the rod-shaped composite material is more This is because a homogeneous random homogenous orientation can be formed.
- the stretching treatment is not particularly limited, and may be arbitrarily determined according to the material constituting the substrate. Examples of such stretching treatment include uniaxial stretching treatment and biaxial stretching treatment. [0183]
- the stretching conditions for the above stretching treatment are not particularly limited as long as the properties as a desired A plate or B plate and the properties as a negative C plate can be imparted to the substrate. .
- the configuration of the base material in this embodiment is not limited to a configuration consisting of a single layer, and may have a configuration in which a plurality of layers are laminated. In the case of a configuration in which a plurality of layers are stacked, layers having the same composition may be stacked, or a plurality of layers having different compositions may be stacked.
- the structure of the base material on which a plurality of layers having different compositions are laminated for example, a film made of a material that randomly aligns the rod-like compound such as triacetyl cellulose and a cyclohexane excellent in water permeability.
- a film made of a material that randomly aligns the rod-like compound such as triacetyl cellulose and a cyclohexane excellent in water permeability.
- An example of the lamination with a support having an olefin polymer strength can be exemplified.
- the retardation film of this embodiment may have other layers in addition to the base material and the retardation layer.
- Examples of such other layers include an antireflection layer, an ultraviolet absorption layer, and an infrared absorption layer and an antistatic layer.
- the antireflection layer, ultraviolet absorption layer, infrared absorption layer, antistatic layer, and the like that can be used in this embodiment are the same as those described in the section “A. Optical functional film”. Therefore, the description here is omitted.
- the thickness of the retardation film of the present embodiment is not particularly limited as long as it is within a range in which desired optical characteristics can be expressed, but it is usually preferable to be within a range of 20 m to 150 / zm. Even if the preferred force is within the range of 25 m to 130 m, it is preferably within the range of 30 m to L 10 m.
- the retardation film of this embodiment preferably has a haze value measured in accordance with JIS K7105 in the range of 0% to 2%, particularly in the range of 0% to 1.5%. It is preferred that it is within the range of 0% to 1%, among others.
- the retardation in the thickness direction of the retardation film of the present embodiment is not particularly limited as long as it is appropriately selected according to the application of the present embodiment.
- the letter direction (Rth) force in the thickness direction is preferably in the range of 60 nm to 450 nm.
- the range of 70 nm to 400 nm is preferable, and the range of 80 nm to 350 nm is particularly preferable. Since the retardation (Rth) in the thickness direction is within the above range, the retardation film of this embodiment can be made suitable for improving the viewing angle characteristics of a VA (Vertical Alignment) liquid crystal display device. It is.
- VA Very Alignment
- the in-plane letter retardation (Re) of the retardation film of this embodiment is not particularly limited as long as it is appropriately selected according to the use of the retardation film of this embodiment.
- the in-plane letter-deposition (Re) force is preferably in the range of 20 nm to 150 nm, more preferably in the range of 30 nm to 130 nm, and particularly preferably in the range of 40 nm to L onm.
- the retardation film of this embodiment is used as a retardation film suitable for improving the viewing angle characteristics of a VA (Vertical Alignment) type liquid crystal display device. This is because it can be used.
- VA Very Alignment
- the in-plane letter decision (Re) value may have wavelength dependency.
- the long wavelength side may have a larger value than the short wavelength side
- the short wavelength side may have a larger value than the long wavelength side. This is because the viewing angle characteristics of the liquid crystal display device can be improved over the entire area of the visible light by having the wavelength dependence of the in-plane letter-deposition (Re) value.
- the use of the retardation film of the present embodiment is not particularly limited.
- an optical compensator for example, a viewing angle compensator
- the retardation film of this embodiment can be suitably used as an optical compensator for improving the viewing angle dependency of a liquid crystal display device.
- the retardation film of this embodiment has properties as an A plate or B plate and a property as a negative C plate, it is most suitably used as an optical compensator for VA liquid crystal display devices. be able to.
- FIG. 5 is a schematic diagram illustrating an embodiment in which the retardation film of this embodiment is used as an optical compensator for a VA liquid crystal display device.
- FIG. 3 is a schematic cross-sectional view showing an example of a general VA liquid crystal display device that does not use the retardation film of this embodiment. As shown in FIG.
- a general liquid crystal display device has a configuration in which a liquid crystal cell 104 is sandwiched between two polarizing plates 30.
- the polarizing plate 30 has a structure in which polarizing plate protective films 51 are laminated on both surfaces of a polarizer 52.
- FIG. 5 (b) is a schematic sectional view showing an example of a liquid crystal display device using the retardation film of this embodiment. As shown in FIG. 5 (b), the retardation film of this embodiment is used between the liquid crystal cell 104 and the polarizing plate 30 on the backlight side as an embodiment of using the retardation film of this embodiment as an optical compensator.
- stacks can be mentioned. According to such an embodiment, there is an advantage that the members used in the conventional liquid crystal display device can be used as they are.
- FIG. 5 (c) is a schematic cross-sectional view showing another example of a liquid crystal display device using the retardation film of this embodiment.
- the retardation film 20 of this embodiment is used as an optical compensator, and the retardation film 20 of this embodiment is used to protect the polarizing plate constituting the polarizing plate 31 on the backlight side.
- the aspect used instead of a film can be mentioned.
- the retardation film of this aspect can serve as an optical compensator for improving viewing angle dependency and a function as a polarizing plate protective film.
- the liquid crystal display device can be further reduced in thickness.
- the retardation film of this embodiment can also be used as a polarizing film by being bonded to a polarizing layer.
- a polarizing film is usually formed by forming a polarizing layer and protective layers on both surfaces thereof.
- the protective layer on one side as the retardation film described above, for example, a liquid crystal display
- a polarizing film having an optical compensation function that improves the viewing angle characteristics of the device can be obtained.
- the polarizing layer is not particularly limited, and for example, an iodine-based polarizing layer, a dye-based polarizing layer using a dichroic dye, a polyenic polarizing layer, or the like can be used.
- the iodine-based polarizing layer and the dye-based polarizing layer are generally produced using polyvinyl alcohol.
- a retardation layer having random homogenous orientation is formed on the substrate.
- a method of coating a retardation layer forming composition prepared by dissolving the rod-like compound in a solvent is usually used on the substrate.
- the rod-shaped compound can be infiltrated into the base material together with the solvent, so that the interaction between the rod-shaped compound and the material constituting the base material can be enhanced. This is a force that facilitates the formation of a random homogeneous orientation of the rod-like composite.
- a method for producing such a retardation film will be described.
- the retardation layer-forming composition usually comprises a rod-like compound and a solvent, and may contain other compounds as necessary.
- the rod-shaped compound and the base material used in the composition for forming a retardation layer are the same as those described in the above sections “1. Retardation layer” and “2. Base material”. Therefore, the description here is omitted.
- the solvent used in the composition for forming a retardation layer is not particularly limited as long as it can dissolve the rod-like compound at a desired concentration and does not corrode the substrate.
- the same solvent as that described as the solvent used in the composition for forming an optical functional layer in the section “A. Optical functional film” can be used. Explanation here is omitted.
- the content of the rod-like composite in the retardation layer forming composition depends on the coating method for applying the retardation layer formation on a substrate, etc.
- the composition is not particularly limited as long as the viscosity of the composition is within a range that can be set to a desired value.
- the content of the rod-shaped compound is preferably in the range of 10% by mass to 30% by mass in the composition for forming a retardation layer, particularly in the range of 10% by mass to 25% by mass. Is preferably within the range of 10% by mass to 20% by mass.
- the retardation layer forming composition may contain a photopolymerization initiator as necessary.
- a photopolymerization initiator when a treatment for curing the retardation layer by ultraviolet irradiation is performed, it is preferable to include a photopolymerization initiator. Further, when the photopolymerization initiator is used, a photopolymerization initiation aid can be used in combination.
- the photopolymerization initiator and the photopolymerization initiation aid used in this embodiment in the above-mentioned section “A. Optical functional film”, the photopolymerization initiator used in the optical functional layer forming composition is used. Since the same initiators and photopolymerization initiation assistants as described above can be used, the explanation here is omitted.
- composition for forming a retardation layer compounds as shown below can be added within the range of! / ⁇ without impairing the purpose of this embodiment.
- compounds that can be added include polyester (meth) acrylates obtained by reacting (meth) acrylic acid with polyester precursors obtained by condensing polyhydric alcohols with monobasic acids or polybasic acids; polyol groups And polyurethane compound obtained by reacting a compound having two isocyanate groups with each other and then reacting the reaction product with (meth) acrylic acid; bisphenol A type epoxy resin, bisphenol F Type epoxy resin, novolac type epoxy resin, polycarboxylic acid polyglycidyl ester, polyol polyglycidyl ether, aliphatic or cycloaliphatic epoxy resin, amino group epoxy resin, triphenol methane type epoxy resin, Epoxy resin such as dihydroxybenzene type epoxy resin and (meth) acrylic acid Examples thereof include photopolymerizable compounds such as epoxy (meth)
- the coating method for coating the retardation layer forming composition on the alignment layer is not particularly limited as long as it can achieve the desired flatness.
- the coating method used in this embodiment is the same as that described as the method for coating the composition for forming an optical functional layer in the section “A. Optical functional film”. Description of is omitted.
- the thickness of the coating film of the composition for forming a retardation layer is not particularly limited as long as the desired flatness can be achieved. Usually, the thickness is 0.1 m to 50 ⁇ m. In the range of m, the internal force S is preferable, and particularly in the range of 0.5 111 to 30 111 is preferable, and in the range of 0.5 / ⁇ ⁇ to 10 / ⁇ m is particularly preferable. If the thickness of the coating film of the retardation layer forming composition is thinner than the above range, the planarity of the retardation layer may be impaired. If the thickness is thicker than the above range, the drying load of the solvent increases, This is because productivity may be reduced.
- the method for drying the coating film of the composition for forming a retardation layer is described as a method for drying the coating film of the composition for forming an optical functional layer in the section "A. Optical functional film" above. Since it is the same as that described above, description thereof is omitted here.
- a method for polymerizing the polymerizable material is not particularly limited, and may be arbitrarily determined according to the type of polymerizable functional group of the polymerizable material. That's fine.
- a method of curing by irradiation with actinic radiation is preferable.
- the actinic radiation is not particularly limited as long as it is a radiation capable of polymerizing the polymerizable material, but usually ultraviolet light or visible light is used from the viewpoint of the ease of equipment.
- irradiation light having a wavelength of 150 to 500 nm, preferably 250 to 450 nm, more preferably 300 to 400 nm.
- the light source of the irradiation light is the same as that described in the section "A. Optical functional film" above, and therefore the description thereof is omitted here.
- the composition for forming an optical functional layer of the present invention comprises a rod-shaped compound and a mixed solvent composed of an alcohol solvent and another organic solvent, and the amount of the alcohol solvent in the mixed solvent is 5% by mass. It is characterized by being in the range of ⁇ 20% by mass.
- the optical functional layer when the optical functional layer is formed using the composition for forming an optical functional layer of the present invention by including an alcohol solvent within the above range in the mixed solvent, white turbidity is formed. An optical functional layer having no transparency and excellent transparency can be obtained.
- the mechanism by which white turbidity is suppressed when the alcohol-based solvent is contained in the mixed solvent in the above range is not clear, but the following is not clear. This is considered to be due to such a mechanism. That is, since the rod-like compound contained in the composition for forming an optical functional layer of the present invention is insoluble in an alcohol solvent, the presence of the alcohol solvent in the mixed solvent makes it possible to form the optical functional layer of the present invention.
- the optical functional layer is formed using the composition for use, the in-plane orientation of the rod-shaped compound can be promoted. From this, as a result of suppressing the arrangement failure of the rod-shaped compound, It is thought that white turbidity of the optical functional layer can be prevented.
- the force that determines the content of the alcohol-based solvent in the mixed solvent to be within the range of 5% by mass to 20% by mass is determined based on the following reason. . That is, if the amount of the alcohol-based solvent is less than the above range, the optical functional layer may become clouded when the optical functional layer is formed using the optical functional layer forming composition of the present invention. is there. On the other hand, if the amount of the alcohol solvent is larger than the above range, the rod-shaped compound described later may not be dissolved at a desired concentration in the optical functional layer forming composition of the present invention.
- the amount of alcohol solvent in the mixed solvent in the present invention can be measured by gas chromatography.
- gas chromatography measurement conditions include the following conditions.
- the composition for forming an optical functional layer of the present invention is preferably used for forming an optical functional layer in which the rod-like composite has a random homogenous orientation.
- the optical functional layer in which the rod-like compound forms a random homogeneous orientation is excellent in the development of optical characteristics that act as a negative C-plate, so that the optical characteristics can be developed without using an alignment film. The ability to form an excellent optical functional layer.
- an alignment film is not required, for example, by using the composition for forming an optical functional layer of the present invention, an optical functional layer is directly formed on the base material, whereby the base material, the optical functional layer, and It is also the power to obtain an optical functional film with excellent adhesion.
- the random homogenous alignment is formed by using the optical functional layer forming composition of the present invention.
- This is one of the arrangements of rod-like composites that impart optical characteristics as a negative c-plate to the optical functional layer.
- the arrangement of rod-like compounds that exhibit optical properties as a negative c-plate has been generally an arrangement with a cholesteric structure, but the random homogenous orientation has a cholesteric structure. It has characteristics that do not have
- composition for forming an optical functional layer of the present invention comprises a rod-shaped compound and a mixed solvent comprising an alcohol solvent and other organic solvent.
- a mixed solvent comprising an alcohol solvent and other organic solvent.
- the mixed solvent used in the present invention consists of an alcohol solvent and another organic solvent.
- the alcohol solvent used for the mixed solvent will be described.
- the alcohol solvent used in the present invention has a function of preventing the optical functional layer from becoming clouded when the optical functional layer is formed using the optical functional layer forming composition of the present invention.
- the amount of the alcohol solvent in the mixed solvent in the present invention is not particularly limited as long as it is within the range of 5% by mass to 20% by mass. Especially in this invention, it is preferable to exist in the range of 10 mass%-20 mass%.
- the method for determining the amount of the alcoholic solvent is the same as described above, and the description thereof is omitted here.
- the alcohol solvent used in the present invention is not particularly limited as long as it does not erode a base material described later.
- Such an alcohol solvent is not limited to one type, and two or more types may be mixed and used.
- the alcohol solvent used in the present invention may be a monohydric alcohol having one OH group in the molecule or a polyhydric alcohol having two or more OH groups. It is good to use monohydric alcohol. /.
- the alcohol solvent used in the present invention may be any of primary alcohols, secondary alcohols, and tertiary alcohols. Among them, primary alcohols are preferably used.
- examples of the alcohol solvent used in the present invention include aliphatic saturated alcohols, aliphatic unsaturated alcohols, alicyclic alcohols, aromatic alcohols, and heterocyclic alcohols. In the present invention, it is preferable to use an aliphatic saturated alcohol.
- the aliphatic saturated alcohol it is preferable to use a lower aliphatic saturated alcohol. More specifically, it is particularly preferable that the number of carbon atoms constituting the hydrocarbon chain is in the range of 1 to 6. It is preferably within the range of 3-5.
- the lower aliphatic saturated alcohol having the above-mentioned carbon number include those having a straight hydrocarbon chain and those having a side chain. However, it can be suitably used.
- alcohol solvents specific examples of alcohol solvents that are preferably used in the present invention include methanol, ethanol, N-propyl alcohol, i-propyl alcohol, n -butyl alcohol, and i-butyl alcohol. Can be mentioned. Of these, isopropyl alcohol and N-propyl alcohol are more preferably used in the present invention.
- the organic solvent in the present invention has a function of dissolving a rod-shaped compound described later at a desired concentration.
- the organic solvent used in the present invention may be a single solvent or a mixed solvent of a plurality of solvents.
- the organic solvent used in the present invention is not particularly limited as long as it can dissolve a rod-shaped compound described later in a desired concentration.
- examples of the organic solvent used in the present invention include hydrocarbon solvents such as benzene and hexane; ketone solvents such as methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, and methylcyclohexanone; tetrahydrofuran, 1 , 2-dimethoxyethane and other ether solvents: black mouth form, dichlorometa
- alkyl halide solvents such as methyl
- ester solvents such as methyl acetate, butyl acetate, and propylene glycol monomethyl ether acetate
- amide solvents such as N, N-dimethylformamide, and sulfoxide solvents such as dimethyl sulfoxide can do.
- the rod-shaped compound used in the present invention is not particularly limited as long as it can impart desired optical properties to the optical functional layer formed using the optical functional layer forming composition of the present invention.
- rod-like composite used in the present invention is the same as that described in the above section “A. Optical Function Film”, and therefore the description thereof is omitted here.
- the content of the rod-like composite in the composition for forming an optical functional layer of the present invention is the formation at the time of forming an optical functional layer using the composition for forming an optical functional layer of the present invention.
- the composition for forming an optical functional layer of the present invention is within a range capable of achieving a desired viscosity.
- the content of the rod-like compound is preferably in the range of 5% by mass to 50% by mass in the composition for forming an optical functional layer, particularly 5% by mass to 20% by mass. It is preferable to be within the range.
- the content of the rod-shaped compound can be obtained by measuring 2 g of the composition for forming an optical functional layer of the present invention in an aluminum cup, drying it in an oven at 150 ° C. for 1 hour, and calculating from the loss of volatilization. it can.
- the composition for forming an optical functional layer of the present invention may have a constitution other than the mixed solvent and the rod-like compound.
- Such other configurations include, for example, silicon leveling agents such as polydimethylsiloxane, methylphenol siloxane, and organically modified siloxane; linear polymers such as polyalkyl acrylate and polyalkyl vinyl ether; fluorine-based interfaces Surfactants such as activators and hydrocarbon surfactants; fluorine leveling agents such as tetrafluoroethylene; photopolymerization initiators and the like.
- the present invention In this case, when a rod-like compound having a polymerizable functional group that is polymerized by light irradiation is used as the rod-like composite, a photopolymerization initiator is preferably included.
- the photopolymerization initiator used in the present invention is the same as that described in the above section “A. Optical functional film”, and therefore the description thereof is omitted here.
- the content of the photopolymerization initiator is not particularly limited as long as it is within a range in which the rod-shaped compound can be polymerized in a desired time, but is usually 1 with respect to 100 parts by weight of the rod-shaped compound. It is preferably in the range of 10 parts by weight to 10 parts by weight, particularly preferably in the range of 3 to 6 parts by weight.
- the content of the photopolymerization initiator is larger than the above range, the arrangement of the rod-like composites is disturbed in the optical functional layer formed using the composition for forming an optical functional layer of the present invention. Because there is a fear. Further, if the content is less than the above range, it may not be possible to polymerize within a desired time depending on the type of rod-shaped compound.
- a photopolymerization initiation assistant can be used in combination.
- a photopolymerization initiation auxiliary agent is the same as that described in the above section “A. Optical functional film”, and the description thereof is omitted here.
- the viscosity of the optical functional layer forming composition of the present invention may be arbitrarily adjusted according to the method of forming the optical functional layer using the optical functional layer forming composition of the present invention, Usually, at 25 ° C, 0.5 mPa 's ⁇ : Within the range of LOmPa' s is preferable, but within the range of lPa 's to 5 Pa ⁇ s, particularly within the range of lPa ⁇ s to 3 Pa ⁇ s. I like it!
- the use of the composition for forming an optical functional layer of the present invention is not particularly limited, but it is preferably used for forming an optical functional layer constituting an optical functional film used in a liquid crystal display device.
- the rod-shaped compound contained in the composition for forming an optical functional layer of the present invention is most preferably used for forming an optical functional layer having a random homogeneous orientation. The details of such random homogenous alignment are as described above, and a description thereof is omitted here.
- the method for producing the composition for forming an optical functional layer of the present invention is not particularly limited as long as it is a method capable of producing the composition for forming an optical functional layer having the above-described configuration, and a general organic solvent composition.
- the method used as a manufacturing method of a thing can be applied.
- a method of dissolving the rod-like compound or the like at a predetermined concentration in a mixed solvent containing an alcohol solvent within the above range can be mentioned.
- the method for producing an optical functional film of the present invention uses a substrate having properties as a negative C plate and the composition for forming an optical functional layer on the substrate, for forming the optical functional layer.
- a substrate having properties as a negative C plate and the composition for forming an optical functional layer on the substrate, for forming the optical functional layer.
- an optical functional film having a base material and an optical functional layer including a rod-shaped compound directly formed on the base material and forming a random homogeneous orientation is produced. It is what.
- an optical functional film having an optical functional layer excellent in transparency is produced by forming an optical functional layer using the composition for forming an optical functional layer containing an alcohol solvent. Can do.
- an optical functional film having excellent adhesion between the optical functional layer and the substrate can be produced by directly forming the optical functional layer on the substrate.
- the adhesion mechanism between the two is improved by directly forming the optical functional layer on the substrate due to the following mechanism. That is, since the optical functional layer is directly formed on the base material, the rod-like composite contained in the optical functional layer can penetrate into the base material. There is no clear interface at the bond with the layer, and the two are “mixed”. For this reason, it is considered that the adhesion is remarkably improved as compared with the adhesion by the conventional interface interaction.
- the optical functional film having a conventional alignment film In addition, in the optical functional film having a conventional alignment film, light is multiply reflected at the interface between the alignment film and the optical functional layer or at the interface between the alignment film and the substrate, resulting in interference unevenness. There was also a point.
- the optical functional film produced according to the present invention does not have an alignment film as described above, and the bonded portion between the substrate and the optical functional layer is in a “mixed” state. As a result, there is no clear interface. Therefore, the above multiple reflections are generated. There is no advantage that the quality is not deteriorated due to interference unevenness.
- the rod-like compound forms a random homogenous alignment in the optical functional layer
- the optical properties can be exhibited without using an alignment film, particularly negative C. It is possible to produce an optical functional film that exhibits excellent optical properties that act as a plate.
- the method for producing an optical functional film of the present invention uses a substrate and a composition for forming an optical functional layer.
- the method for producing the optical functional film of the present invention will be described in detail.
- composition for forming an optical functional layer used in the present invention is the same as that described in the above-mentioned section “A. Composition for forming an optical functional layer”, and thus the description thereof is omitted here.
- the substrate used in the present invention has a function as a negative C plate.
- the optical functional film obtained by the method for producing an optical functional film of the present invention has a rod-like combination contained in the optical functional layer by forming the optical functional layer directly on the substrate. Since the material forms a random homogenous alignment, the substrate used in the present invention also has a function as a so-called alignment film for the rod-shaped compound to form a random homogenous alignment. To do.
- the base material used in the present invention will be described.
- the substrate used in the present invention is not particularly limited as long as it has properties as an optically negative C plate.
- the base material used in the present invention has a property as a negative C plate for the following reason. That is, as described above, the base material used in the present invention has a negative force when the rod-like composite functions as a so-called alignment film for forming a random homogeneous alignment. This is because the rod-like composite cannot form a random homogenous orientation unless it has the properties as a C plate.
- an optical functional layer is formed on a substrate having properties as a negative C plate by using the optical functional layer forming composition, whereby the rod-like composite is made into a random homogeneity.
- the mechanism for forming the first orientation is the same as the reason explained in the above section “A. Optical functional film”, and the explanation is omitted here.
- the base material is considered to have a function as an alignment film for forming the random homogenous orientation of the rod-like composite, and thus the base material used in the present invention.
- the base material used in the present invention must have a structure in which the constituent material of the base material that has an orientation regulating force on the rod-like compound and exhibits the property as a negative C plate is present on the surface of the base material. Therefore, even if the substrate has properties as a negative C plate, when the optical functional layer is formed on the substrate, the rod-shaped compound has an alignment regulating force with respect to the rod-shaped compound.
- Those having a structure that cannot be in contact with the constituent materials cannot be used as a base material in the present invention! /.
- a base material that cannot be used in the present invention for example, a support made of only a polymer material and having a function as a negative C plate, and has refractive index anisotropy on the support.
- a substrate having a configuration in which a retardation layer containing an optically anisotropic material is laminated can be given.
- the high molecular material constituting the support is a constituent material of the base material having an orientation regulating force with respect to the rod-shaped compound, but when an optical functional layer is formed on the base material Because of the presence of the retardation layer, the rod-shaped compound cannot contact the polymer material. Therefore, the base material having such a configuration is not included in the base material in the present invention even if it has a property as a negative C plate.
- the property of the base material used in the present invention as a negative C plate depends on the type of rod-shaped compound used in the optical functional layer forming composition, the optical characteristics required for the optical functional film produced according to the present invention, and the like. Please select and use as appropriate.
- the thickness direction letter-deposition (Rth) force of the substrate is 20 ⁇ ! It is preferably in the range of ⁇ lOOnm, especially 25 ⁇ ! 30 ⁇ even though it is preferably within the range of ⁇ 80nm! It is preferable to be within a range of ⁇ 60 nm.
- the present invention has a thickness direction letter retardation (Rth) in the above range.
- the rod-like composite can also form a uniform random homogenous alignment.
- the thickness direction letter-thickness (Rth) is the refractive index Nx in the fast axis direction (the direction in which the refractive index is smallest) and the slow axis direction in the plane of the substrate used in the present invention.
- the thickness direction letter decision (Rth) is a value measured by KOBRA-WR manufactured by Oji Scientific Instruments at room temperature.
- the letter direction in the thickness direction is used.
- in-plane letter decision (Re) force Onn! It is preferably within the range of ⁇ 300 nm, especially ⁇ ⁇ ⁇ ! It is preferable to be in the range of ⁇ 150 nm, and in particular, it is preferable to be in the range of Onm to 125 nm!
- the value of the in-plane letter decision (Re) in the present invention a value measured with KOBRA-WR manufactured by Oji Scientific Instruments at room temperature is used.
- the transparency of the base material used in the present invention may be arbitrarily determined according to the transparency required for the optical functional film produced according to the present invention.
- the transmittance in the visible light region is 80%. 90% or more is more preferable. This is because if the transmittance is low, the selection range of the rod-like composite material or the like may become narrow.
- the transmittance of the base material can be measured according to JIS K7361-1 (Testing method of total light transmittance of a plastic transparent material).
- the thickness of the base material used in the present invention is not particularly limited as long as it has necessary self-supporting properties, depending on the use of the optical functional film produced according to the present invention.
- the range of 10 ⁇ m to 188 ⁇ m is preferable, the range of 20 ⁇ m to 125 ⁇ m is particularly preferable, and the range of 30 ⁇ m to 80 ⁇ m is particularly preferable. This is because if the thickness of the substrate is thinner than the above range, the self-supporting property required for the optical functional film produced according to the present invention may not be obtained. Further, if the thickness is larger than the above range, for example, when cutting the optical functional film produced according to the present invention, there is a case where processing waste increases or wear of the cutting blade is accelerated. Because there is.
- the substrate used in the present invention is not particularly limited as long as it has the above-mentioned optical characteristics.
- the materials constituting such a base material are the same as those described in the above section “A. Optical functional film”, and thus description thereof is omitted here.
- the substrate used in the present invention is preferably subjected to a stretching treatment.
- the stretching treatment By performing the stretching treatment, the rod-shaped composite material easily penetrates into the substrate, and due to this, the adhesion between the substrate and the optical functional layer is excellent, and the rod-shaped compound is formed. This is because it is possible to form an optical functional layer in which a more uniform random homogeneous orientation is formed.
- the stretching treatment is not particularly limited, and may be arbitrarily determined according to the material constituting the base material.
- Examples of such stretching treatment include uniaxial stretching treatment and biaxial stretching treatment.
- the stretching treatment in the present invention is preferably a biaxial stretching treatment.
- the stretching method of the biaxial stretching treatment is not particularly limited as long as it can impart a desired negative C-plate property to the substrate, but in the present invention, for example, It can be appropriately performed by any stretching method such as a roll stretching method, a long gap stretching method, a tenter stretching method, and a tubular stretching method.
- the polymer film is preferably heated to, for example, a glass transition temperature or higher and a melting point temperature or lower.
- the structure of the substrate in the present invention is not limited to a structure composed of a single layer, and may have a structure in which a plurality of layers are laminated. In the case of a configuration in which a plurality of layers are stacked, layers having the same composition may be stacked, or a plurality of layers having different compositions may be stacked.
- Examples of the structure of the base material on which a plurality of layers having different compositions are laminated include a material that randomly aligns the rod-like compound such as triacetyl cellulose. And a film laminated with a support having a cycloolefin polymer force excellent in water permeability.
- the optical functional layer is formed by directly coating the optical functional layer forming composition on the substrate.
- the coating method for applying the composition for forming an optical functional layer on a substrate is not particularly limited as long as the thickness is uniform and desired flatness can be achieved. Specifically, gravure coating method, reverse coating method, knife coating method, dip coating method, spray coating method, air knife coating method, spin coating method, roll coating method, printing method, dipping and lifting method, curtain coating method A force that can exemplify a die coating method, a casting method, a bar coating method, an etching coating method, an E-type coating method, etc. is not limited thereto.
- the thickness of the coating film of the composition for forming an optical functional layer is not particularly limited as long as the desired flatness can be achieved, but is usually 0.1 m to 50 ⁇ m.
- the range of m is preferable. Particularly, the range of 0.5 ⁇ to 30 / ⁇ ⁇ is preferable, but the range of 0.5 m to 10 ⁇ m is preferable. If the thickness of the coating film of the composition for forming an optical functional layer is smaller than the above range, the planarity of the optical functional layer may be impaired. If the thickness is larger than the above range, the drying load of the solvent increases and This is because the performance may deteriorate.
- a drying method for drying the coating film of the composition for forming an optical functional layer a commonly used drying method such as a heat drying method, a vacuum drying method, a gap drying method, or the like can be used.
- the drying method in the present invention is not limited to a single method, and a plurality of drying methods may be employed, for example, by changing the drying method sequentially in accordance with the amount of solvent remaining.
- the method for polymerizing the polymerizable material is not particularly limited, and is optional depending on the type of polymerizable functional group of the polymerizable material. You just have to decide.
- a method of curing by irradiation with actinic radiation is preferable. As actinic radiation, it is possible to polymerize polymerizable materials.
- ultraviolet light or visible light from the viewpoint of the ease of equipment, etc.
- the wavelength is 150 to 500 nm, preferably It is preferable to use irradiation light of 250 to 450 nm, more preferably 300 to 400 nm.
- a low-pressure mercury lamp (sterilization lamp, fluorescent chemical lamp, black light), a high-pressure discharge lamp (high-pressure mercury lamp, metal nitride lamp), a short arc discharge lamp (ultra-high pressure mercury lamp, Examples include xenon lamps and mercury xenon lamps). Among these, use of metal halide lamps, xenon lamps, high-pressure mercury lamps, etc. is recommended.
- the irradiation intensity can be appropriately adjusted according to the content of the photopolymerization initiator.
- optical functional film produced by the method for producing an optical functional film of the present invention has a base material and an optical functional layer directly formed on the base material.
- the rod-like compound forms a random homogeneous alignment.
- optical functional film produced according to the present invention is characterized in that the optical functional layer is formed using the composition for forming an optical functional layer, so that the transparency is excellent.
- the optical functional film produced according to the present invention can achieve high V and display quality with less occurrence of unevenness and cloudiness when used as an optical compensation film for liquid crystal display devices, for example. And!
- the optical functional film produced according to the present invention allows the base material and the optical functional layer to be firmly adhered by forming the optical functional layer directly on the base material. This has the advantage that no peeling or the like occurs.
- the optical functional film produced according to the present invention exhibits the optical properties that act as a negative C plate because the rod-shaped compound forms a random homogeneous orientation in the optical functional layer. It is an excellent one.
- the thickness of the optical functional film produced according to the present invention is not particularly limited as long as it is within a range in which desired optical characteristics can be expressed. Usually, the thickness is within a range of 30 to 200 ⁇ m. S, preferably in the range of 30 m to 150 m, preferably S, more preferably in the range of 30 ⁇ m to 100 ⁇ m.
- the optical functional film produced according to the present invention preferably has a haze value measured in accordance with JIS K7105 in the range of 0.1% to 5%, particularly 0.1% to 1%. Among these, it is preferable to be within the range of 0.1% to 0.5%.
- the retardation (Rth) in the thickness direction of the optical functional film produced according to the present invention is not particularly limited as long as it is appropriately selected according to the use of the optical functional film.
- the letter direction (Rth) force in the thickness direction is preferably in the range of 50 nm to 500 nm, more preferably in the range of 100 nm to 400 nm, particularly preferably in the range of 100 nm to 400 nm. Since the thickness direction letter retardation (Rth) is within the above range, the optical functional film produced according to the present invention is suitable for improving the viewing angle characteristics of a VA (Vertica 1 Alignment) type liquid crystal display device. It is also the power that can be made.
- VA Very 1 Alignment
- the definition of the thickness direction letter-thickness (Rth) and the measurement method are the same as those described in the section “1. Substrate” above, and therefore the description thereof is omitted here.
- the in-plane lettering (Re) of the optical functional film produced according to the present invention is not particularly limited as long as it is appropriately selected according to the use of the optical functional film.
- the in-plane letter decision (Re) force is preferably in the range of Onm to 5 nm. It is particularly preferable to be within the range of ⁇ 3 nm, and it is more preferable to be within the range of Onm ⁇ : Lnm.
- the optical functional film produced according to the present invention is suitable for improving the viewing angle characteristics of a VA (Vertical Alignment) type liquid crystal display device. Force that can be used as a retardation film.
- VA Vertical Alignment
- the in-plane letter-deposition (Re) value may have wavelength dependency.
- the long wavelength side may have a larger value than the short wavelength side
- the short wavelength side may have a larger value than the long wavelength side.
- optical functional film produced according to the present invention is not particularly limited, and can be used for various uses as an optical functional film.
- Specific applications of the optical functional film of the present invention include, for example, optical compensation plates (for example, viewing angle compensation plates) used in liquid crystal display devices, elliptically polarizing plates, and brightness enhancement plates.
- optical compensation plates for example, viewing angle compensation plates
- it can be suitably used for use as a negative C plate.
- an optical compensator which is a negative C plate it is suitably used for a liquid crystal display device having a liquid crystal layer such as a VA mode or an OCB mode.
- the optical functional film of the present invention can also be used as a polarizing plate by being bonded to a polarizer.
- a polarizing plate is a polarizing plate protective film formed on both surfaces of the polarizer and the optical functional film produced by the present invention on the polarizing plate protective film on one side thereof.
- the polarizer is not particularly limited, and for example, an iodine-based polarizer, a dye-based polarizer using a dichroic dye, a polyenic polarizer, and the like can be used.
- Iodine polarizers and dye polarizers are generally manufactured using polyvinyl alcohol.
- the optical functional film of the present invention may be used after being subjected to a stretching treatment.
- the embodiment for performing such stretching treatment is not particularly limited, and for example, a mode in which the optical functional film obtained by the present invention is subjected to stretching treatment and used as a biaxial film can be exemplified. .
- the present invention is not limited to the above embodiment.
- the above embodiment is merely an example, and the technical idea described in the claims of the present invention has substantially the same configuration and exhibits the same functions and effects in any case.
- Technical of the invention Included in the range.
- the compound (I) represented by the following formula as a rod-like compound is dissolved in cyclohexanone in an amount of 20% by mass, and the TAC film (manufactured by Fuji Photo Film Co., Ltd., trade name: TF80UL) is used as a base material.
- the coating amount after drying was 2.5 gZm2.
- the mixture is heated at 90 ° C. for 4 minutes to remove the solvent by drying, penetrate the rod-like compound into the TAC film, and further irradiate the coated surface with ultraviolet rays to fix the rod-like compound.
- a retardation film was produced.
- the obtained retardation film was used as a sample and evaluated according to the following items.
- the retardation film does not have a selective reflection wavelength by an ultraviolet-visible gold-infrared spectrophotometer (UV-3100) manufactured by Shimadzu Corporation.
- UV-3100 ultraviolet-visible gold-infrared spectrophotometer
- Adhesion test In order to examine the adhesion, a peel test was performed. For the peel test, lmm square cuts are put in a grid pattern on the obtained sample, and adhesive tape (Cerotape (registered trademark) manufactured by Nichiban Co., Ltd.) is applied to the liquid crystal surface, and then the tape is peeled off. It was observed visually. As a result, the degree of adhesion was 100%.
- Adhesion degree (%) (Peeled-off force part Z taped area) X 100 [0277] 3. Moisture and heat resistance test 1
- the sample was immersed in hot water at 90 ° C for 60 minutes, and the optical characteristics and adhesion were measured by the method described above. As a result, there was no change in optical properties and adhesion before and after the test.
- the sample was allowed to stand for 24 hours in an environment of 80 ° C and 95% humidity, and the optical properties and adhesion were measured by the methods described above. As a result, there was no change in optical properties and adhesion before and after the test. In addition, no exudation of the refractive index anisotropic material or white turbidity was observed after the test.
- the sample was immersed in an alkaline aqueous solution (1.5N aqueous sodium hydroxide solution) at 55 ° C for 3 minutes, washed with water and dried, and the optical properties and adhesion were measured by the methods described above. As a result, there was no change in optical properties and adhesion before and after the test. Also, no coloring was seen o
- a photopolymerizable liquid crystal compound represented by the formula (I) as a rod-like compound cyclohexanone 20 weight 0/0 was dissolved in cyclohexane, unstretched COP (cyclo O Les fins polymer) film (JSR Corporation, trade name: ARTON ) By bar coating. Subsequently, the solvent was removed by heating at 50 ° C. for 2 minutes. Further, the photopolymerizable liquid crystal compound is fixed by irradiating the coated surface with ultraviolet rays, and further heated at 90 ° C. for 2 minutes to remove the residual solvent, thereby causing a phase difference. A film was prepared. The obtained retardation film was used as a sample and evaluated according to the following items.
- Re and the presence / absence of selective reflection wavelength, Rth, and haze were evaluated for the retardation layer of the produced retardation film.
- the measurement is performed for the entire retardation film and the unstretched COP (cycloolefin polymer) film (trade name: ARTON, manufactured by JSR Corporation), and the former measurement force is also subtracted from the latter measurement value. It went by.
- product name: KOBRA-21ADH manufactured by Oji Scientific Instruments Co., Ltd. was used for measurement of Re and Rth.
- product name: Nippon Denshoku Industries Co., Ltd. product name: NDH20000 was used for the measurement of the said haze.
- the product name: UV-3100PC manufactured by Shimadzu Corporation was used to confirm the presence or absence of the selective reflection wavelength.
- the photopolymerizable liquid crystal compound was randomly homogeneously aligned in the retardation layer of the produced retardation film.
- phase difference of the sample was measured with an automatic birefringence measuring apparatus (manufactured by Oji Scientific Instruments, trade name: KOBRA-21ADH).
- the anisotropy that increases the phase difference of the base film was confirmed from the chart of the optical phase difference and the incident angle of the measurement light when the measurement light was perpendicularly or obliquely incident on the sample surface.
- the haze value was measured with a turbidimeter (manufactured by Nippon Denshoku Industries Co., Ltd., trade name: ND H2000).
- the coating amount was 3 gZm 2 and it was good at 0.3% or less.
- the sample was immersed in hot water at 90 ° C for 60 minutes, and the optical characteristics and adhesion were measured by the method described above. As a result, there was no change in optical properties and adhesion before and after the test.
- a photopolymerizable liquid crystal compound represented by the formula (I) as a rod-like compound cyclohexanone 20 weight 0/0 was dissolved in cyclohexane, uniaxial stretching COP (cyclo O Les fins polymer) film (JSR Stock Company Ltd., trade name: ARTON) was coated by bar coating. The solvent was then removed by heating at 50 ° C for 2 minutes. Further, the photopolymerizable liquid crystal compound was fixed by irradiating the coated surface with ultraviolet rays, and further heated at 90 ° C. for 2 minutes to remove the residual solvent, thereby producing a retardation film. Using the resulting retardation film as a sample, evaluate the following items.
- the retardation layer of the produced retardation film was evaluated for the presence of Re and selective reflection wavelength, Rth, and haze.
- Rth Re and selective reflection wavelength
- COP cycloolefin polymer
- ARTON uniaxially stretched COP (cycloolefin polymer) film
- the measured force was also subtracted from the latter measured value.
- product name: KOBRA-21ADH manufactured by Oji Scientific Instruments Co., Ltd. was used.
- Nippon Denshoku Industries Co., Ltd. make, brand name: NDH2000 was used for the said haze measurement.
- the product name: UV-3100PC manufactured by Shimadzu Corporation was used to confirm the presence or absence of the selective reflection wavelength.
- the photopolymerizable liquid crystal compound was randomly homogeneously aligned in the retardation layer of the produced retardation film.
- the phase difference of the sample was measured with an automatic birefringence measuring apparatus (manufactured by Oji Scientific Instruments, trade name: KOBRA-21ADH).
- the anisotropy that increases the phase difference of the base film was confirmed from the chart of the optical phase difference and the incident angle of the measurement light when the measurement light was perpendicularly or obliquely incident on the sample surface.
- the three-dimensional refractive index was measured with the same measuring device. The results are shown in Table 1 below.
- the haze value was measured with a turbidimeter (manufactured by Nippon Denshoku Industries Co., Ltd., trade name: ND H2000).
- the coating amount was 3 gZm 2 and it was good at 0.3% or less.
- Adhesion degree (%) (Peeled force / tape area) X 100
- the sample was immersed in hot water at 90 ° C for 60 minutes, and the optical characteristics and adhesion were measured by the method described above. As a result, there was no change in optical properties and adhesion before and after the test.
- the sample was immersed in pure water for 1 day at room temperature (23.5 ° C), and the optical properties and Adhesion was measured. As a result, there were no changes in optical properties and adhesion before and after the test.
- a photopolymerization initiator (Irgacure 907, manufactured by Ciba Geigy Japan, Inc.) was prepared so as to be 1% by mass with respect to the mass of the nematic liquid crystal, and a composition for forming an optical functional layer was produced.
- the ink composition was applied to a substrate of 80 ⁇ m-thick triacetinoresenorelose (TAC) film by a bar coating method, dried in an oven at 50 ° C for 2 minutes, and then a nitrogen atmosphere. Below, UV light of lOOmjZcm 2 was irradiated and cured to form an optical functional layer, and an optical (compensation) film was produced.
- TAC triacetinoresenorelose
- a nematic liquid crystal similar to that used in Example 4 was dissolved in an amount of 20% by mass in a solvent that also has the power of anone.
- a photopolymerization initiator (Irgacure 907, manufactured by Ciba Geigy Japan, Inc.) was adjusted to 1% by mass with respect to the mass of the nematic liquid crystal to prepare an optical functional layer forming composition. Thereafter, an optical (compensation) film was produced in the same manner as in Example 1.
- the haze and total light transmittance of the optical (compensation) films prepared in the above examples and comparative examples were measured according to the method specified in JIS K 7361.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Polarising Elements (AREA)
- Liquid Crystal (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE112006002503.1T DE112006002503B4 (de) | 2005-09-29 | 2006-09-28 | Optischer Funktionsfilm, Verzögerungsfilm und Verfahren zur Herstellung eines optischen Funktionsfilms |
CN2006800363704A CN101278216B (zh) | 2005-09-29 | 2006-09-28 | 光学功能薄膜、相位差薄膜、光学功能层形成用组合物、及光学功能薄膜的制造方法 |
US12/088,260 US8064136B2 (en) | 2005-09-29 | 2006-09-28 | Optical functional film, retardation film, composition for forming optical functional layer and producing method of optical functional film |
KR1020087010212A KR101368114B1 (ko) | 2005-09-29 | 2006-09-28 | 광학 기능 필름, 위상차 필름, 광학 기능층 형성용 조성물 및 광학 기능 필름의 제조 방법 |
US13/173,525 US8355203B2 (en) | 2005-09-29 | 2011-06-30 | Optical functional film, retardation film, composition for forming optical functional layer and producing method of optical functional film |
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2005-285678 | 2005-09-29 | ||
JP2005285678A JP4134133B2 (ja) | 2005-09-29 | 2005-09-29 | 光学機能フイルム、および、位相差フイルム |
JP2005-285680 | 2005-09-29 | ||
JP2005285680A JP2007094208A (ja) | 2005-09-29 | 2005-09-29 | 位相差フイルム |
JP2005-285679 | 2005-09-29 | ||
JP2005285679A JP2007094207A (ja) | 2005-09-29 | 2005-09-29 | 光学機能層形成用組成物、および、光学機能フイルムの製造方法 |
Related Child Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/088,260 A-371-Of-International US8064136B2 (en) | 2005-09-29 | 2006-09-28 | Optical functional film, retardation film, composition for forming optical functional layer and producing method of optical functional film |
US13/173,525 Continuation US8355203B2 (en) | 2005-09-29 | 2011-06-30 | Optical functional film, retardation film, composition for forming optical functional layer and producing method of optical functional film |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2007037317A1 true WO2007037317A1 (ja) | 2007-04-05 |
Family
ID=37899741
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2006/319281 WO2007037317A1 (ja) | 2005-09-29 | 2006-09-28 | 光学機能フィルム、位相差フィルム、光学機能層形成用組成物、および、光学機能フィルムの製造方法 |
Country Status (5)
Country | Link |
---|---|
US (2) | US8064136B2 (ja) |
KR (1) | KR101368114B1 (ja) |
DE (1) | DE112006002503B4 (ja) |
TW (1) | TWI391757B (ja) |
WO (1) | WO2007037317A1 (ja) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007276142A (ja) * | 2006-04-03 | 2007-10-25 | Jsr Corp | 積層フィルムの製造方法および積層フィルム |
WO2007132816A1 (ja) * | 2006-05-16 | 2007-11-22 | Dai Nippon Printing Co., Ltd. | 光学機能フィルムおよびその製造方法 |
JP2009237097A (ja) * | 2008-03-26 | 2009-10-15 | Dainippon Printing Co Ltd | 液晶表示装置 |
CN108693673A (zh) * | 2017-03-31 | 2018-10-23 | 株式会社日本显示器 | 取向膜的制造方法及液晶显示装置 |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009037236A (ja) * | 2007-07-11 | 2009-02-19 | Dainippon Printing Co Ltd | 液晶表示装置用偏光板、液晶表示装置用偏光板の製造方法、および、液晶表示装置 |
TWI386722B (zh) * | 2008-10-24 | 2013-02-21 | Taiwan Tft Lcd Ass | 光學片、顯示裝置及其製作方法 |
KR20140063302A (ko) * | 2012-11-16 | 2014-05-27 | 삼성디스플레이 주식회사 | 캐리어 기판 제거 장치, 표시장치 제조 시스템, 및 표시장치 제조 방법 |
JP2014130352A (ja) | 2012-12-27 | 2014-07-10 | Samsung Electronics Co Ltd | 光学フィルムおよびこれを備える有機発光表示装置 |
JP2015043073A (ja) * | 2013-07-25 | 2015-03-05 | 富士フイルム株式会社 | 位相差フィルム、偏光板および液晶表示装置 |
CN106662693B (zh) | 2014-07-31 | 2019-05-10 | 三菱瓦斯化学株式会社 | 光学膜、包含其的叠层光学膜和光学膜的制造方法 |
JP6454756B2 (ja) * | 2017-06-02 | 2019-01-16 | 日東電工株式会社 | 液晶表示装置 |
JPWO2019193838A1 (ja) * | 2018-04-02 | 2021-04-15 | ソニー株式会社 | 液晶表示装置、表示方法 |
KR102261688B1 (ko) * | 2018-04-17 | 2021-06-07 | 주식회사 엘지화학 | 타원 편광판 및 유기발광장치 |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2000310780A (ja) * | 1999-04-27 | 2000-11-07 | Nippon Mitsubishi Oil Corp | 液晶フィルムの製造方法、液晶フィルム及び光学素子 |
JP2004145268A (ja) * | 2002-08-26 | 2004-05-20 | Dainippon Printing Co Ltd | 位相差光学素子及びその製造方法、並びに位相差光学素子を備えた偏光素子及び液晶表示装置 |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2972892B2 (ja) | 1989-05-15 | 1999-11-08 | 株式会社リコー | 液晶表示素子 |
JPH04322223A (ja) | 1991-04-23 | 1992-11-12 | Toshiba Corp | 液晶表示素子 |
DE19504224A1 (de) | 1994-02-23 | 1995-08-24 | Merck Patent Gmbh | Flüssigkristallines Material |
JP2866372B2 (ja) | 1997-03-10 | 1999-03-08 | 富士写真フイルム株式会社 | 液晶表示装置および光学補償シート |
EP1329747A4 (en) * | 2000-10-20 | 2006-06-07 | Fuji Photo Film Co Ltd | CELLULOSE ACETATE FILM HAVING OPTICAL DELAY AND THICKNESS THICKNESS |
JP4316131B2 (ja) | 2000-11-21 | 2009-08-19 | 富士フイルム株式会社 | 光学補償フイルムの製造方法 |
JP2002303722A (ja) | 2001-04-04 | 2002-10-18 | Fuji Photo Film Co Ltd | 光学補償シート |
JP2003207644A (ja) * | 2001-11-09 | 2003-07-25 | Dainippon Printing Co Ltd | 光学素子の製造方法 |
JP4234960B2 (ja) * | 2002-07-17 | 2009-03-04 | 富士フイルム株式会社 | 偏光板の製造方法 |
TW200422329A (en) * | 2003-02-19 | 2004-11-01 | Konica Minolta Holdings Inc | Optical compensation film, viewing angle compensation integral type polarizing plate, and liquid crystal display device |
JP2005037440A (ja) * | 2003-07-15 | 2005-02-10 | Konica Minolta Opto Inc | 光学補償フィルム、偏光板及び液晶表示装置 |
CN101334498B (zh) * | 2003-07-17 | 2010-12-01 | 大日本印刷株式会社 | 相位差层、相位差光学元件、偏光元件及液晶显示装置 |
-
2006
- 2006-09-28 KR KR1020087010212A patent/KR101368114B1/ko active IP Right Grant
- 2006-09-28 WO PCT/JP2006/319281 patent/WO2007037317A1/ja active Application Filing
- 2006-09-28 DE DE112006002503.1T patent/DE112006002503B4/de not_active Expired - Fee Related
- 2006-09-28 US US12/088,260 patent/US8064136B2/en not_active Expired - Fee Related
- 2006-09-29 TW TW095136230A patent/TWI391757B/zh not_active IP Right Cessation
-
2011
- 2011-06-30 US US13/173,525 patent/US8355203B2/en active Active
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2000310780A (ja) * | 1999-04-27 | 2000-11-07 | Nippon Mitsubishi Oil Corp | 液晶フィルムの製造方法、液晶フィルム及び光学素子 |
JP2004145268A (ja) * | 2002-08-26 | 2004-05-20 | Dainippon Printing Co Ltd | 位相差光学素子及びその製造方法、並びに位相差光学素子を備えた偏光素子及び液晶表示装置 |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007276142A (ja) * | 2006-04-03 | 2007-10-25 | Jsr Corp | 積層フィルムの製造方法および積層フィルム |
WO2007132816A1 (ja) * | 2006-05-16 | 2007-11-22 | Dai Nippon Printing Co., Ltd. | 光学機能フィルムおよびその製造方法 |
JP2009237097A (ja) * | 2008-03-26 | 2009-10-15 | Dainippon Printing Co Ltd | 液晶表示装置 |
CN108693673A (zh) * | 2017-03-31 | 2018-10-23 | 株式会社日本显示器 | 取向膜的制造方法及液晶显示装置 |
Also Published As
Publication number | Publication date |
---|---|
KR101368114B1 (ko) | 2014-02-27 |
US8064136B2 (en) | 2011-11-22 |
US20110253932A1 (en) | 2011-10-20 |
US8355203B2 (en) | 2013-01-15 |
DE112006002503T5 (de) | 2008-07-31 |
TWI391757B (zh) | 2013-04-01 |
DE112006002503B4 (de) | 2015-05-21 |
KR20080068034A (ko) | 2008-07-22 |
TW200719061A (en) | 2007-05-16 |
US20100149638A1 (en) | 2010-06-17 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
WO2007037317A1 (ja) | 光学機能フィルム、位相差フィルム、光学機能層形成用組成物、および、光学機能フィルムの製造方法 | |
KR102443875B1 (ko) | 위상차 필름, 위상차 필름의 제조 방법, 적층체, 조성물, 편광판 및 액정 표시 장치 | |
KR101377911B1 (ko) | 위상차 필름, 휘도 향상 필름, 편광판, 위상차 필름의 제조 방법 및 액정 표시 장치 | |
WO2006054603A1 (ja) | 位相差フィルム及びその製造方法、光学機能フィルム、偏光フィルム、並びに表示装置 | |
KR20080034405A (ko) | 위상차 필름 및 편광판 | |
WO2007132816A1 (ja) | 光学機能フィルムおよびその製造方法 | |
US8305524B2 (en) | Liquid crystal display polarizing plate, method for producing liquid crystal display polarizing plate, and liquid crystal display | |
JP2007094271A (ja) | 位相差層形成用塗工液、位相差光学積層体、および、位相差光学積層体の製造方法 | |
TW201447399A (zh) | 光學薄膜、偏光板、畫像顯示裝置及光學薄膜之製造方法 | |
JP4134133B2 (ja) | 光学機能フイルム、および、位相差フイルム | |
WO2006028217A1 (ja) | 位相差フィルムおよびその製造方法、光学機能フィルム、偏光フィルム、並びに、表示装置 | |
JP7498681B2 (ja) | 位相差フィルム、偏光板補償フィルム、及び外光反射防止フィルム | |
JP2009036860A (ja) | 液晶表示装置 | |
JP2007304444A (ja) | 位相差フィルム、および、位相差フィルムの製造方法 | |
JP5029043B2 (ja) | 位相差フィルム、および、位相差フィルムの製造方法 | |
JP2007094207A (ja) | 光学機能層形成用組成物、および、光学機能フイルムの製造方法 | |
JP2008009345A (ja) | 位相差フィルム | |
JP2006146165A (ja) | 防眩フィルム、反射防止防眩フィルム、光学素子および画像表示装置 | |
JP7513136B2 (ja) | 位相差フィルム、偏光板補償フィルム、及び外光反射防止フィルム | |
JP2007094208A (ja) | 位相差フイルム | |
WO2023276611A1 (ja) | 偏光板の製造方法、有機エレクトロルミネッセンス表示装置の製造方法、偏光板、有機エレクトロルミネッセンス表示装置、液晶表示装置 | |
JP2008039931A (ja) | 光学機能層形成用組成物、および、光学機能フィルムの製造方法 | |
JP2009080251A (ja) | 位相差フィルムおよび液晶表示装置 | |
JP2008083183A (ja) | 位相差フィルム | |
JP2008242292A (ja) | 位相差フィルムおよび液晶表示装置 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
WWE | Wipo information: entry into national phase |
Ref document number: 200680036370.4 Country of ref document: CN |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
WWE | Wipo information: entry into national phase |
Ref document number: 12088260 Country of ref document: US Ref document number: 1120060025031 Country of ref document: DE |
|
WWE | Wipo information: entry into national phase |
Ref document number: 1020087010212 Country of ref document: KR |
|
RET | De translation (de og part 6b) |
Ref document number: 112006002503 Country of ref document: DE Date of ref document: 20080731 Kind code of ref document: P |
|
WWE | Wipo information: entry into national phase |
Ref document number: DE |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 06810729 Country of ref document: EP Kind code of ref document: A1 |