JP2013076762A - Composition for pattern alignment layer and manufacturing method of pattern alignment film and pattern retardation film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a composition for a pattern alignment layer excellent in both optical alignment and adhesion to a TAC base material.SOLUTION: A composition for a pattern alignment layer contains an optical alignment material exhibiting optical alignment by polarized light irradiation, solvent dissolving the optical alignment material and polyfunctional acrylate. Pentaerythritol tetraacrylate or the like is referred to as an example of the polyfunctional acrylate. It is preferable that its content be 10 pts.mass or more and less than 30 pts.mass with respect to the content of 100 pts.mass of the optical alignment material. A pattern alignment film 1 is formed by applying the composition for a pattern alignment layer on a base material 11, subsequently heating and drying the composition and, further, forming a pattern alignment layer 12 having different optical alignment by polarized light pattern irradiation.

Description

  The present invention relates to a composition for a pattern alignment layer, and a method for producing a pattern alignment film and a pattern retardation film.

  In recent years, flat panel displays capable of three-dimensional display have begun to attract attention, and are also commercially available. In addition, it is expected that the future flat panel display is capable of three-dimensional display, and it is expected that the performance is naturally required, and a flat panel display capable of three-dimensional display is being studied in a wide range of fields.

  In order to perform three-dimensional display on a flat panel display, it is usually necessary to display a right-eye image and a left-eye image separately for the viewer in some way. As a method for separately displaying the right-eye video and the left-eye video, for example, a passive method is known. Such a passive three-dimensional display method will be described with reference to the drawings. FIG. 4 is a schematic diagram illustrating an example of a passive three-dimensional display. As shown in FIG. 4, in this method, first, the pixels constituting the flat panel display are divided into a plurality of types of pixels, that is, a right-eye video display pixel and a left-eye video display pixel, The pixel displays a right-eye image, and the other group of pixels displays a left-eye image. Also, using a linearly polarizing plate and a patterned retardation film on which a patterned retardation layer corresponding to the division pattern of the pixel is formed, a right-eye image and a left-eye image are orthogonal to each other. Convert to polarized light. In addition, the viewer wears circular polarizing glasses that employ circular polarizing lenses that are orthogonal to each other for the right-eye lens and the left-eye lens, so that the right-eye image passes only through the right-eye lens and the left-eye image is displayed. Pass only through the lens for the left eye. In this way, the passive method enables three-dimensional display by allowing the right-eye image to reach only the right eye and the left-eye image to reach only the left eye.

  Such a passive method has an advantage that three-dimensional display can be easily performed by using the pattern retardation film and the corresponding circular polarizing glasses.

  By the way, as described above, in the passive method, it is essential to use a pattern retardation film. However, such a pattern retardation film has not been widely researched and developed, and can be used as a standard technique. There is nothing that has been established. As an example, a photo-alignment film in which the alignment regulating force is controlled in a pattern on a glass substrate, and patterning is performed on the photo-alignment film so that the alignment of the liquid crystal compound corresponds to the pattern of the photo-alignment film. It has been proposed to have a retardation layer (see Patent Document 1).

JP 2005-49865 A

  However, since it is essential to use a glass substrate, the pattern retardation plate described in Patent Document 1 is expensive, and is not capable of manufacturing a large area in large quantities. The problem remains.

  In order to solve this problem, it is also considered to use a plastic substrate such as triacetyl cellulose (hereinafter referred to as “TAC”) instead of a glass substrate, and is widely used in flat panel displays for two-dimensional display. . However, when it is going to form a photo-alignment film on a TAC base material, it is difficult to achieve both the photo-alignment property and the adhesion to the TAC base material.

  This invention is made | formed in view of the said situation, The place made into the objective is providing the composition for pattern orientation layers excellent in both photoalignment and the adhesiveness with respect to a TAC base material. is there.

  The present inventor has made extensive studies to solve the above problems, and by adding a polyfunctional acrylate to the composition for a pattern alignment layer, it is excellent in both photo-alignment and adhesion to a TAC substrate. The present inventors have found that a composition for a patterned alignment layer can be provided, and have completed the present invention. Specifically, the present invention provides the following.

  (1) The present invention is a composition for a pattern alignment layer for forming a pattern alignment layer containing a photo-alignment material that exhibits photo-alignment properties upon irradiation of polarized light on a substrate, the photo-alignment material, It is a composition for pattern orientation layers containing the solvent which melt | dissolves this photo-alignment material, and polyfunctional acrylate.

  (2) Moreover, this invention is composition for pattern orientation layers as described in (1) whose content of the said polyfunctional acrylate is 10 to 30 mass parts with respect to 100 mass parts of said photo-alignment materials. It is.

  (3) In the present invention, the pattern alignment layer composition described in (1) or (2) is heated and dried after being applied onto a substrate, and further has a pattern alignment having different photo-alignment properties by irradiation with a polarized pattern. It is a manufacturing method of the pattern orientation film which forms a layer.

  (4) Moreover, this invention is a manufacturing method of the pattern orientation film as described in (3) whose said base material is a triacetyl cellulose.

  (5) Moreover, this invention is a manufacturing method of the pattern orientation film as described in (3) or (4) whose thickness of the said pattern orientation layer is 100 nm or more and 1000 nm or less.

  (6) Moreover, this invention shows liquid crystallinity on the pattern orientation layer of the pattern orientation film obtained by the manufacturing method in any one of (3) to (5), and has a polymerizable functional group in a molecule | numerator. It is a manufacturing method of the pattern phase difference film which has the process of forming the phase difference layer containing a rod-shaped compound.

  ADVANTAGE OF THE INVENTION According to this invention, the composition for pattern orientation layers excellent in both the photo-alignment property and the adhesiveness with respect to a TAC base material can be provided. Moreover, a pattern alignment film and a pattern retardation film can be manufactured using this composition.

It is the schematic of the pattern orientation film which concerns on this invention. It is the figure which showed typically the formation method of the orientation pattern. It is the schematic of the pattern phase difference film which concerns on this invention. It is a figure where it uses for description of the three-dimensional image display by a passive system.

  Hereinafter, specific embodiments of the present invention will be described in detail. However, the present invention is not limited to the following embodiments, and may be implemented with appropriate modifications within the scope of the object of the present invention. can do.

<Composition for pattern alignment layer>
The composition for pattern alignment layers of this invention contains the photo-alignment material which exhibits photo-alignment property by polarized light irradiation, and the solvent which dissolves this photo-alignment material. The solvent contains a main solvent having an evaporation rate of less than 100 when butyl acetate is 100 and a sub-solvent having the evaporation rate of 100 or more, and the ratio of the sub-solvent in the solvent is 10% by mass or more and 50% by mass. %. Hereinafter, these components will be described.

[Photo-alignment material]
The photo-alignment material refers to a material that can exhibit an alignment regulating force by irradiation with polarized ultraviolet rays. The alignment regulating force refers to a function of arranging rod-like compounds in a predetermined direction when an alignment layer containing a photo-alignment material is formed and a layer made of a rod-like compound is formed on the alignment layer.

  The photo-alignment material is not particularly limited as long as it exhibits the above-mentioned alignment regulating force by irradiating polarized light. Such photo-alignment materials include photoisomerization materials that reversibly change the alignment regulation force by changing only the molecular shape by cis-trans changes, and photoreaction materials that change the molecules themselves by irradiating polarized light. It can be divided roughly. In the present invention, any of the photoisomerization material and the photoreaction material can be preferably used, but the photoreaction material is more preferably used. Since the photoreactive material is one in which molecules react with each other when polarized light is irradiated to express the alignment regulating force, it is possible to irreversibly express the alignment regulating force. Therefore, the photoreactive material is superior in the temporal stability of the orientation regulating force.

  The photoreactive material can be further classified according to the type of reaction caused by polarized light irradiation. Specifically, a photodimerization type material that develops an alignment regulation force by causing a photodimerization reaction, a photodegradable material that produces an orientation regulation force by producing a photodecomposition reaction, an orientation regulation by producing a photobinding reaction It can be divided into a photocoupled material that develops force, and a photodecomposition-coupled material that develops alignment regulating force by causing a photodecomposition reaction and a photocoupled reaction. In the present invention, any of the above-mentioned photoreactive materials can be suitably used, but it is more preferable to use a photodimerization type material from the viewpoint of stability and reactivity (sensitivity).

  The photodimerization type material is not particularly limited as long as it is a material that can exhibit an alignment regulating force by causing a photodimerization reaction. It is preferable that it is within a range of 280 nm to 400 nm, and more preferably within a range of 300 nm to 380 nm.

  Examples of such a photodimerization type material include polymers having cinnamate, coumarin, benzylidenephthalimidine, benzylideneacetophenone, diphenylacetylene, stilbazole, uracil, quinolinone, maleinimide, or a cinnamilidene acetic acid derivative. Among them, a polymer having one or both of cinnamate and coumarin is preferably used in that the orientation regulating force is good. Specific examples of such a photodimerization type material include compounds described in, for example, JP-A-9-118717, JP-T-10-506420, JP-T2003-505561, and WO2010 / 150748. Can be mentioned.

As the cinnamate and coumarin, those represented by the following formulas Ia and Ib are preferably used.

In the above formula, A represents pyrimidine-2,5-diyl, pyridine-2,5-diyl, 2,5-thiophenylene, 2,5-furylene, 1,4- or 2,6-naphthylene, Unsubstituted, fluorine, chlorine or cyclic, linear or branched alkyl residues of 1 to 18 carbon atoms (unsubstituted or mono- or polysubstituted by fluorine, chlorine, 1 Represents phenylene which is mono- or polysubstituted by two or more non-adjacent —CH ₂ — groups which may be independently substituted by the group C.

  In the above formula, B represents a hydrogen atom or a group capable of reacting or interacting with a second substance, such as a polymer, oligomer, monomer, photoactive polymer, photoactive oligomer and / or photoactive monomer or surface. Represents.

In the above formula, C represents —O—, —CO—, —CO—O—, —O—CO—, —NR ₁ —, —NR ₁ —CO—, —CO—NR ₁ —, —NR ₁ —. CO—O—, —O—CO—NR ₁ —, —NR ₁ —CO—NR ₁ —, —CH═CH—, —C≡C—, —O—CO—O— and Si (CH 3) 2 — A group selected from O—Si (CH 3) 2 — (wherein R ₁ represents a hydrogen atom or lower alkyl).

In the above formula, D represents —O—, —CO—, —CO—O—, —O—CO—, —NR ₁ —, —NR ₁ —CO—, —CO—NR ₁ —, —NR ₁ —. CO—O—, —O—CO—NR ₁ —, —NR ₁ —CO—NR ₁ —, —CH═CH—, —C≡C—, —O—CO—O— and Si (CH 3) 2 — A group selected from O—Si (CH 3) 2 — (R ₁ represents a hydrogen atom or lower alkyl), an aromatic group or an alicyclic group.

In the above formula, S ₁ and S ₂ are independently of each other a single bond or a spacer unit, for example a linear or branched alkylene group having 1 to 40 carbon atoms (unsubstituted, fluorine or chlorine One or more substituted and one or more non-adjacent —CH ₂ — groups may be independently substituted by the group D, but the oxygen atoms are not directly bonded to each other).

In the above formula, Q represents an oxygen atom or NR ₁ — (R ₁ represents a hydrogen atom or lower alkyl).

In the above formula, X and Y are independently of each other hydrogen, fluorine, chlorine, cyano, alkyl having 1 to 12 carbon atoms (optionally substituted by fluorine and optionally not one or more adjacent). alkyl -CH ₂ - groups are -O -, - CO-O - , - O-CO- and / or CH = CH- represents a) are replaced by.

  In addition, the photo-alignment material used for this invention may be only 1 type, and may use 2 or more types.

[Adhesion improver]
The composition for pattern alignment layers of the present invention contains an adhesion improver. When the composition for pattern alignment layer is applied on the base material, the adhesion improver causes a chemical reaction with the base material to roughen the surface of the base material. From the base material and a cured product of the pattern alignment layer composition It has a function to improve adhesion to the pattern alignment layer.

  As the adhesion improver, it is preferable to use a polyfunctional acrylate. Any polyfunctional acrylate may be used as long as it is conventionally known. In addition to pentaerythritol tetraacrylate (hereinafter referred to as “PETA”), 1,4-butanediol diacrylate, 1,6- Examples include hexanediol diacrylate, 1,9-nonanediol diacrylate, and trimethylolpropane triacrylate.

  When used as an adhesion improver, the amount is preferably 10 parts by mass or more and less than 30 parts by mass with respect to 100 parts by mass of the photo-alignment material. If it is less than 10 parts by mass, there is a possibility that appropriate adhesion may not be obtained, which is not preferable. When it exceeds 30 parts by mass, a part of the adhesion improving agent is impregnated into the substrate when the composition for pattern alignment layer is applied onto the substrate, and as a result, the photoalignment property may be lowered.

[solvent]
The solvent used in the composition for the pattern alignment layer is not particularly limited as long as it can dissolve the photo-alignment material or the like at a desired concentration. For example, hydrocarbon solvents such as benzene and hexane, methyl ethyl ketone, methyl isobutyl Ketone solvents such as ketone and cyclohexanone (hereinafter referred to as “CHN”), ether solvents such as tetrahydrofuran, 1,2-dimethoxyethane and propylene glycol monoethyl ether (PGME), and alkyl halide solvents such as chloroform and dichloromethane Ester solvents such as methyl acetate, ethyl acetate, butyl acetate, propylene glycol monomethyl ether acetate, amide solvents such as N, N-dimethylformamide, sulfoxide solvents such as dimethyl sulfoxide, anone solvents such as cyclohexane, Lumpur, ethanol can be exemplified an alcohol solvent such as isopropyl alcohol (hereinafter. Referred to as "IPA"), but is not limited thereto. Moreover, one type of solvent may be sufficient and the mixed solvent of two or more types of solvents may be sufficient.

  The amount of the solvent is preferably 600 parts by mass or more and 3900 parts by mass or less with respect to 100 parts by mass of the photo-alignment material. If it is less than 600 parts by mass, the photo-alignment material may not be dissolved uniformly, which is not preferable. When the amount exceeds 3900 parts by mass, a part of the solvent remains, and the remaining solvent impregnates the base material when the composition for pattern alignment layer is applied onto the base material. It is not preferable in that both the adhesion to the substrate can be lowered.

[Others]
In addition, you may contain various additives as needed.

<Pattern alignment film 1>
FIG. 1 is a schematic diagram of a pattern alignment film 1 according to the present embodiment. In the pattern alignment film 1, a pattern alignment layer 12 made of a cured product of the pattern alignment layer composition is formed on a substrate 11.

[Substrate 11]
The base material 11 is a transparent film material, has a function of supporting the pattern alignment layer 12, and is formed in a long shape.

  The substrate 11 preferably has a small retardation, and an in-plane retardation (in-plane retardation value, hereinafter also referred to as “Re value”) is preferably in the range of 0 nm to 10 nm, and 0 nm to 5 nm. More preferably, it is in the range of 0 nm to 3 nm. If the Re value exceeds 10 nm, the display quality of the flat panel display using the pattern alignment film may be deteriorated, which is not preferable.

Here, the Re value is an index indicating the degree of birefringence in the in-plane direction of the refractive index anisotropic body, and the refractive index in the slow axis direction having the largest refractive index in the in-plane direction is Nx, When the refractive index in the fast axis direction orthogonal to the axial direction is Ny, and the thickness in the direction perpendicular to the in-plane direction of the refractive index anisotropic body is d,
Re [nm] = (Nx−Ny) × d [nm]
It is a value represented by. The Re value can be measured by, for example, a parallel Nicol rotation method using a phase difference measuring device KOBRA-WR (manufactured by Oji Scientific Instruments). Further, in this specification, unless otherwise specified, the Re value means a value at a wavelength of 589 nm.

  The transmittance of the substrate 11 in the visible light region is preferably 80% or more, and more preferably 90% or more. Here, the transmittance | permeability of a transparent film base material can be measured by JISK7361-1 (the test method of the total light transmittance of a plastic-transparent material).

  The substrate 11 is preferably a flexible material having flexibility that can be wound into a roll. Such flexible materials include cellulose derivatives, norbornene polymers, cycloolefin polymers, polymethyl methacrylate, polyvinyl alcohol, polyimide, polyarylate, polyethylene terephthalate, polysulfone, polyethersulfone, amorphous polyolefin, modified acrylic polymer, polystyrene. And epoxy resins, polycarbonates, polyesters, and the like. Especially, it is preferable to use a cellulose derivative at the point which is excellent in optical isotropy and can manufacture the pattern orientation film excellent in the optical characteristic.

  Among the cellulose derivatives, cellulose esters are preferably used and cellulose acylates are more preferably used because they are widely used industrially and are easily available.

  As said cellulose acylates, C2-C4 lower fatty acid ester is preferable. The lower fatty acid ester may include only a single lower fatty acid ester such as cellulose acetate, and may include a plurality of fatty acid esters such as cellulose acetate butyrate and cellulose acetate propionate. There may be.

  Among the lower fatty acid esters, cellulose acetate can be particularly preferably used. As the cellulose acetate, it is most preferable to use TAC having an average degree of acetylation of 57.5% to 62.5% (substitution degree: 2.6 to 3.0). Here, the degree of acetylation means the amount of bound acetic acid per unit mass of cellulose. The degree of acetylation can be determined by measurement and calculation of the degree of acetylation in ASTM: D-817-91 (test method for cellulose acetate and the like). In addition, the acetylation degree of TAC can be calculated | required by said method, after removing impurities, such as a plasticizer contained in a film.

  The thickness of the base material 11 is not particularly limited as long as it is within a range in which the necessary self-supporting property can be imparted to the retardation film, depending on the use of the retardation film produced using the pattern alignment film. Usually, it is preferably within the range of 25 μm to 125 μm, more preferably within the range of 40 μm to 100 μm, and even more preferably within the range of 60 μm to 80 μm. If it is less than 25 μm, the necessary self-supporting property may not be imparted to the retardation film, which is not preferable. When the retardation film is longer than 125 μm, when the retardation film is long, when the long retardation film is cut into a single-phase retardation film, the processing waste increases or the cutting blade is worn. May become faster, which is not preferable.

  The base material 11 is not restricted to the structure which consists of a single layer, You may have the structure by which the several layer was laminated | stacked. When it has the structure by which the several layer was laminated | stacked, the layer of the same composition may be laminated | stacked, and the several layer which has a different composition may be laminated | stacked.

[Pattern orientation layer 12]
The pattern alignment layer 12 consists of the hardened | cured material of the said composition for pattern alignment layers, and has two types of alignment patterns alternately. FIG. 2 is a diagram schematically showing a method for forming an alignment pattern. Details of the alignment pattern will be described in detail later in the section “Method for Producing Pattern Alignment Film”. The above-mentioned composition for pattern alignment layer is applied on substrate 11 and the composition for pattern alignment layer is heated. After drying to form a thin film-like pattern alignment layer forming layer 12 ′, as shown in FIG. 2A, the first alignment preparation region 12′A corresponding to the region for the right eye is not shielded, By irradiating the pattern alignment layer forming layer 12 ′ with ultraviolet rays (polarized ultraviolet rays) by linearly polarized light through the mask 11 that shields only the second alignment preparation region 12′B corresponding to the region for the left eye, After orienting the first alignment preparation region 12′A that is not shielded in a desired direction, as shown in FIG. 2B, ultraviolet rays are emitted by linearly polarized light whose polarization direction is 90 degrees different from the first irradiation. Irradiate the entire surface of the pattern alignment layer forming layer 12 ' , The first irradiation aligning second alignment preparation area 12'B unexposed in the desired direction. The pattern alignment layer 12 having two types of alignment patterns is formed by these two UV irradiations.

  In the example of FIG. 2, the first alignment preparation region 12′A is first irradiated with polarized ultraviolet light, and then the second alignment preparation region 12′B is irradiated with polarized ultraviolet light. However, the order is not limited to this, First, the second alignment preparation region 12′B may be irradiated with polarized ultraviolet light, and then the first alignment preparation region 12′A may be irradiated with polarized ultraviolet light.

  The thickness of the pattern alignment layer 12 is not particularly limited as long as it is within a range in which a desired alignment regulating force can be expressed with respect to the rod-shaped compound, but is preferably within a range of 100 nm to 1000 nm. If it is less than 100 nm, the rod-like compound may not be able to express a desired alignment regulating force, which is not preferable. If it exceeds 1000 nm, the adhesion may be reduced, which is not preferable.

<Pattern retardation film 2>
FIG. 3 is a diagram showing the pattern retardation film 2 according to this embodiment. In the following, “pattern phase difference” is abbreviated as “phase difference”, but “phase difference” is synonymous with “pattern phase difference” unless otherwise specified. In the retardation film 2, a retardation layer 13 including a rod-like compound having liquid crystallinity and having a polymerizable functional group in the molecule is further formed on the pattern alignment layer 12 of the pattern alignment film 1.

[Phase difference layer 13]
The retardation layer 13 contains a rod-like compound that exhibits liquid crystallinity and has a polymerizable functional group in the molecule. Since the retardation layer 13 is formed along the alignment pattern, the retardation layer 13 includes a first retardation region 4A corresponding to the region for the right eye and a second retardation region 4B corresponding to the region for the left eye.

(Bar compound)
An example of the rod-shaped compound is a liquid crystal material. The liquid crystal material has a refractive index anisotropy and has a function of imparting a desired retardation to the retardation layer 13 by arranging the liquid crystal material regularly along the alignment pattern. Examples of the liquid crystal material include a material exhibiting a liquid crystal phase such as a nematic phase and a smectic phase, but the nematic phase is easier to arrange regularly than a liquid crystal material exhibiting other liquid crystal phases. It is more preferable to use the liquid crystal material shown.

  As the liquid crystal material exhibiting the nematic phase, a material having spacers at both ends of the mesogen is preferably used. This is because the liquid crystal material having spacers at both ends of the mesogen is excellent in flexibility, and by using such a liquid crystal material, the retardation film 2 can be made excellent in transparency.

  Furthermore, the liquid crystal material preferably has a polymerizable functional group in the molecule, and more preferably has a polymerizable functional group capable of three-dimensional crosslinking. Since the liquid crystal material has a polymerizable functional group, it is possible to polymerize and fix the liquid crystal material, so that it is possible to obtain the retardation layer 13 that has excellent alignment stability and is less likely to change with time in retardation. Because it can.

  Here, “three-dimensional cross-linking” means that liquid crystal molecules are polymerized three-dimensionally to form a network structure.

  Examples of the polymerizable functional group include polymerizable functional groups that are polymerized by the action of ionizing radiation such as ultraviolet rays and electron beams, or heat. Representative examples of these polymerizable functional groups include radically polymerizable functional groups or cationic polymerizable functional groups. Further, representative examples of the radical polymerizable functional group include a functional group having at least one addition-polymerizable ethylenically unsaturated double bond, and specific examples include a vinyl group having or not having a substituent, An acrylate group (generic name including an acryloyl group, a methacryloyl group, an acryloyloxy group, and a methacryloyloxy group) and the like can be given. Moreover, an epoxy group etc. are mentioned as a specific example of the said cation polymerizable functional group. In addition, 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.

  Furthermore, it is particularly preferable that the liquid crystal material has the polymerizable functional group at the terminal. By using such a liquid crystal material, for example, it can be polymerized three-dimensionally to form a network structure, so that it has column stability and excellent optical characteristics. This is because the above can be formed. In the present invention, even when a liquid crystal material having a polymerizable functional group at one end is used, the alignment can be stabilized by crosslinking with other molecules.

  Specific examples of the liquid crystal material used in the present invention include compounds represented by the following formulas (1) to (17).

  In addition, only 1 type may be used for a liquid crystal material, and 2 or more types may be mixed and used for it. For example, 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 as the liquid crystal material, the blending ratio of both is adjusted. Is preferable because the polymerization density (crosslinking density) and optical characteristics can be arbitrarily adjusted. Further, from the viewpoint of ensuring reliability, a liquid crystal material having one or more polymerizable functional groups at both ends is preferable, but from the viewpoint of liquid crystal alignment, it is preferable that there is one polymerizable functional group at both ends.

  The amount of the liquid crystal material is not particularly limited as long as the viscosity of the coating liquid for forming the retardation layer can be set to a desired value according to the coating method applied on the pattern alignment layer 12, but in the coating liquid It is preferably within the range of 5 to 40 parts by mass, and more preferably within the range of 10 to 30 parts by mass. If it is less than 5 masses, the amount of liquid crystal material is too small, and therefore there is a possibility that the incident light to the retardation layer 13 may not be properly aligned, which is not preferable. If the amount exceeds 30 parts by mass, the viscosity of the retardation layer forming coating solution becomes too high, and the workability is inferior.

  The thickness of the retardation layer 13 is not particularly limited as long as it is within a range in which a predetermined retardation can be achieved, but the in-plane retardation of the retardation layer 13 corresponds to λ / 4 minutes. It is preferable to do. Here, λ is a wavelength of 500 nm. As a result, the linearly polarized light passing through the retardation layer 13 can be made into circularly polarized light orthogonal to each other, so that a three-dimensional image can be displayed with higher accuracy.

(Polymerization initiator)
Although not an essential component of the present invention, it is preferable to add a polymerization initiator as appropriate when the polymerizable liquid crystal material is a rod-like compound.

  Examples of the polymerization initiator include benzophenone, methyl o-benzoylbenzoate, 4,4-bis (dimethylamine) benzophenone, 4,4-bis (diethylamine) benzophenone, α-amino acetophenone, 4,4-dichlorobenzophenone, 4-benzoyl-4-methyldiphenyl ketone, dibenzyl ketone, fluorenone, 2,2-diethoxyacetophenone, 2,2-dimethoxy-2-phenylacetophenone, 2-hydroxy-2-methylpropiophenone, p-tert- Butyldichloroacetophenone, thioxanthone, 2-methylthioxanthone, 2-chlorothioxanthone, 2-isopropylthioxanthone, diethylthioxanthone, benzyldimethyl ketal, benzylmethoxyethyl acetal, benzoin Ether, benzoin butyl ether, anthraquinone, 2-tert-butylanthraquinone, 2-amylanthraquinone, β-chloroanthraquinone, anthrone, benzanthrone, dibenzsuberone, methyleneanthrone, 4-azidobenzylacetophenone, 2,6-bis (p-azidobenzylidene) ) Cyclohexane, 2,6-bis (p-azidobenzylidene) -4-methylcyclohexanone, 2-phenyl-1,2-butadion-2- (o-methoxycarbonyl) oxime, 1-phenyl-propanedione-2- ( o-ethoxycarbonyl) oxime, 1,3-diphenyl-propanetrione-2- (o-ethoxycarbonyl) oxime, 1-phenyl-3-ethoxy-propanetrione-2- (o-benzoyl) oxime, Hiller ketone, 2-methyl-1 [4- (methylthio) phenyl] -2-morpholinopropan-1-one, 2-benzyl-2-dimethylamino-1- (4-morpholinophenyl) -butanone, naphthalenesulfonyl chloride , Quinolinesulfonyl chloride, n-phenylthioacridone, 4,4-azobisisobutyronitrile, diphenyl disulfide, benzthiazole disulfide, triphenylphosphine, camphorquinone, N1717 manufactured by Adeka, carbon tetrabromide, tribromophenyl Examples include a combination of a photoreductive dye such as sulfone, benzoin peroxide, eosin, and methylene blue with a reducing agent such as ascorbic acid or triethanolamine. In the present invention, these polymerization initiators can be used alone or in combination of two or more.

  When the polymerization initiator is used, a polymerization initiation assistant can be used in combination. Examples of such polymerization initiation assistants include tertiary amines such as triethanolamine and methyldiethanolamine, and benzoic acid derivatives such as 2-dimethylaminoethyl benzoic acid and ethyl 4-dimethylamide benzoate. However, it is not limited to these.

(solvent)
In addition, a solvent is usually used to dissolve the liquid crystal material. The solvent is not particularly limited as long as it can uniformly dissolve or disperse the liquid crystal material. For example, hydrocarbon solvents such as benzene and hexane, ketone solvents such as methyl ethyl ketone, methyl isobutyl ketone, and cyclohexanone, tetrahydrofuran , 1,2-dimethoxyethane, ether solvents such as propylene glycol monoethyl ether (PGME), halogenated alkyl solvents such as chloroform and dichloromethane, esters such as methyl acetate, ethyl acetate, butyl acetate, propylene glycol monomethyl ether acetate Solvents, amide solvents such as N, N-dimethylformamide, sulfoxide solvents such as dimethyl sulfoxide, anan solvents such as cyclohexane, alcohols such as methanol, ethanol, and propanol It can be used as the medium. Further, the solvent may be one kind or a mixed solvent of two or more kinds of solvents.

(Other compounds)
In addition, other compounds can be added as long as the order of alignment of the liquid crystal material is not impaired. Examples of other compounds include a polymerization initiator, a polymerization inhibitor, a plasticizer, a surfactant, and a silane coupling agent.

<Flat panel display>
The retardation film 2 is preferably used for a flat panel display for three-dimensional display. By using the retardation film 2 for a flat panel display for three-dimensional display, both the photo-alignment property and the adhesion to the substrate 11 are obtained. There is a special effect of being excellent.

<Method for Producing Pattern Alignment Film 1>
The pattern alignment film 1 is manufactured through the following steps. First, the base material 11 is provided from the long film wound up by the roll, and the composition coating process which coats the said composition for pattern orientation layers on this base material 11 is performed. Subsequently, a layer forming process for forming a pattern alignment layer is performed in which the composition is thermally cured to form a thin film pattern alignment layer forming layer 12 ′. Subsequently, an ultraviolet irradiation process for irradiating the pattern alignment layer forming layer 12 'with ultraviolet rays is performed. By these treatments, the pattern alignment layer 12 is formed, and as a result, the pattern alignment film 1 is formed.

[Composition coating treatment]
First, in providing the base material 11, there is no particular limitation as long as the long film can be continuously conveyed, and a method using a general conveying means can be used. Specific examples include a method using an unwinder that feeds a roll-shaped long film, a winder that winds the long film, and a method that uses a belt conveyor, a transport roll, and the like. Moreover, the method of using the floating-type conveyance stand which conveys in the state which floated the film for elongate alignment film formation by discharging and sucking | sucking air may be used.

  In addition, the presence or absence of tension applied to the long film at the time of conveyance is not particularly limited as long as it is a method capable of stably and continuously conveying the long film, but the film is conveyed with a predetermined tension applied. It is preferable. This is because continuous conveyance can be performed more stably.

  The color of the conveying means is preferably a color that does not reflect polarized ultraviolet light that has passed through the long film when it is disposed at a site where the polarized film is irradiated with polarized ultraviolet light. Specifically, black is preferable. Examples of such a black method include a method of chromium treatment of the surface.

  The shape of the transport roll is not particularly limited as long as the long film can be stably transported, but when the long film is disposed at a site irradiated with polarized ultraviolet rays. It is preferable that the distance between the surface of the long film and the ultraviolet irradiation device can be kept constant, and it is usually preferable that the distance is a perfect circle.

  The coating of the pattern alignment layer composition is not particularly limited as long as the pattern alignment layer forming layer 12 ′ can be formed on the substrate 11 with a desired thickness. Method, knife coating method, dip coating method, spray coating method, air knife coating method, spin coating method, roll coating method, printing method, dip pulling method, curtain coating method, die coating method, casting method, bar coating method, extrusion Examples thereof include a coating method and an E-type coating method.

  The thickness of the pattern alignment layer forming layer 12 ′ is not particularly limited as long as the desired planarity can be achieved, but is preferably in the range of 0.1 μm to 50 μm. More preferably, it is in the range of 5 μm to 30 μm, and further preferably in the range of 0.5 μm to 10 μm.

[Layer formation treatment for pattern alignment layer formation]
The curing temperature of the pattern alignment layer composition is preferably 100 ° C. or higher and 130 ° C. or lower. When the temperature is lower than 100 ° C., the composition cannot be uniformly heat-cured, which is not preferable because the thin film may be non-uniform. If it exceeds 130 ° C., the substrate 11 and the thin film may shrink, which is not preferable.

[Ultraviolet irradiation treatment]
The ultraviolet irradiation process for irradiating the pattern alignment layer forming layer 12 'with ultraviolet rays will be described in detail with reference to FIG.
First, as shown in FIG. 2A, the first alignment preparation region 12′A corresponding to the right eye region is not shielded, and only the second alignment preparation region 12′B corresponding to the left eye region is formed. By irradiating the pattern alignment layer forming layer 12 ′ with ultraviolet rays (polarized ultraviolet rays) by linearly polarized light through the mask 11 that is shielded from light, the first alignment preparation region 12′A that is not shielded from light is directed in a desired direction. Orient. Subsequently, as shown in FIG. 2B, ultraviolet rays are irradiated on the entire surface of the pattern alignment layer forming layer 12 ′ by linearly polarized light whose polarization direction is 90 degrees different from that of the first irradiation. The unexposed second alignment preparation region 12′B is aligned in a desired direction. Two types of alignment patterns are formed by these two UV irradiations.

  In the example of FIG. 2, the first alignment preparation region 12′A is first irradiated with polarized ultraviolet light, and then the second alignment preparation region 12′B is irradiated with polarized ultraviolet light. However, the order is not limited to this, First, the second alignment preparation region 12′B may be irradiated with polarized ultraviolet light, and then the first alignment preparation region 12′A may be irradiated with polarized ultraviolet light.

  The pattern of the mask, that is, the pattern irradiation pattern, is stable in the first alignment region 12A (see FIG. 1) corresponding to the region for the right eye and the second alignment region 12B (the same) corresponding to the region for the left eye. If it can form in this, it will not specifically limit, For example, a strip | belt-shaped pattern, a mosaic pattern, a zigzag pattern, etc. can be mentioned. Among them, a belt-like pattern is preferable, and in particular, a belt-like pattern parallel to each other in the longitudinal direction of the long film, that is, pattern irradiation becomes a belt-like pattern parallel to each other in the longitudinal direction of the long film. It is preferable to irradiate polarized ultraviolet rays. It is because it can form easily by fixing the irradiation position of polarized ultraviolet rays and conveying a long film in a longitudinal direction. Moreover, it is because it can irradiate with pattern shape with sufficient precision. In the retardation layer 13, a pattern in which the first retardation region 4A corresponding to the region for the right eye and the second retardation region 4B corresponding to the region for the left eye are formed, and a color filter used in the display device This is because it is easy to make the correspondence with the pattern in which the pixels are formed.

  The pattern width of the mask, that is, the irradiation width and the irradiation interval (non-irradiation width) of polarized ultraviolet rays may be the same or different, but the width of the region corresponding to the region for the right eye and the left eye Preferably, the width of the region corresponding to the region for use is the same. It becomes easy to make the pattern in which the first retardation region 4A and the second retardation region 4B are formed in the retardation layer 13 correspond to the pattern in which the pixel portion is formed. This is because a panel display can be easily manufactured. When aligning the position with the stripe line of the color filter, the pattern in which the region corresponding to the region for the right eye and the region corresponding to the region for the left eye are formed and the stripe pattern of the color filter have a corresponding relationship. It is preferable to irradiate with a width.

  In the case of a three-dimensional display application, the pattern width is preferably in the range of 50 μm to 1000 μm, and more preferably in the range of 100 μm to 600 μm. In addition, the pattern width here refers to the pattern width of the pattern orientation layer 12 in the base material 11 contained in the phase difference film 2 in a stable contraction state.

  The material constituting the mask is not particularly limited as long as a desired opening can be formed, and examples thereof include metals and quartz that are hardly deteriorated by ultraviolet rays. Specifically, a metal substrate such as SUS that has been patterned by etching, laser processing, or electroforming, and further subjected to surface treatment such as nickel plating as necessary can be used. Further, a light shielding film made of emulsion (silver salt) or chromium can be provided on a substrate made of soda lime glass or quartz.

  Among them, it is preferable that Cr is patterned on synthetic quartz. The pattern alignment layer forming layer 12 'made of a cured product of the pattern alignment layer composition is excellent in dimensional stability and ultraviolet transmittance with respect to changes in temperature and humidity, etc., and can be irradiated with ultraviolet rays with high accuracy, resulting in a highly accurate pattern. This is because the alignment layer 12 can be formed.

  The thickness of the synthetic quartz mask is not particularly limited as long as it can form a pattern with high dimensional accuracy, but it is preferably within a range of 1 mm to 20 mm, and within a range of 5 mm to 18 mm. Is more preferable, and it is still more preferable to be in the range of 9 mm to 16 mm. This is because when the thickness is within the above-mentioned range, the thickness can be reduced, the dimensional accuracy can be improved, and the photomask is not excessively heavy. .

  The polarization direction of the polarized ultraviolet light is not particularly limited as long as the polarization direction with respect to the region corresponding to the region for the right eye and the polarization direction with respect to the region corresponding to the region for the left eye are different. It is preferable that the difference is 90 °. Since the direction (slow axis direction) in which the refractive index is largest between the first phase difference region 4A and the second phase difference region 4B can be orthogonal to each other, a display device capable of three-dimensional display It is because it can manufacture more suitably.

  The direction different by 90 ° is not particularly limited as long as it can perform three-dimensional display with high accuracy when a display device capable of three-dimensional display is formed using the pattern alignment film 1. Usually, it is preferably within a range of 90 ° ± 3 °, more preferably within a range of about 90 ° ± 2 °, and further preferably within a range of about 90 ° ± 1 °. This is because a display device capable of high-performance three-dimensional display can be obtained.

  The polarized ultraviolet light may be collected or may not be collected. However, when the pattern irradiation is performed on the long film on the transport roll, that is, the polarized ultraviolet light. When there is a difference in the distance from the light source of polarized ultraviolet light within the region irradiated with, the light is preferably condensed with respect to the transport direction. This is because the influence of the distance from the light source can be reduced and the alignment region can be formed with high pattern accuracy.

  Examples of the condensing method include a generally used method, for example, a method using a condensing reflector or a condensing lens having a desired shape. In the present invention, it is preferable that the polarized ultraviolet light is parallel light with respect to the direction (width direction) orthogonal to the transport direction. As a parallelization method, a generally used method, for example, a desired shape is used. Examples thereof include a method using a condensing reflector or a condensing lens.

  The wavelength of the polarized ultraviolet light is appropriately set according to the photo-alignment material and the like, and can be a wavelength used when expressing the alignment regulating force in a general photo-alignment material. Specifically, It is preferable to use irradiation light having a wavelength of 210 nm to 380 nm, preferably 230 nm to 380 nm, more preferably 250 nm to 380 nm.

  Low-pressure mercury lamps (sterilization lamps, fluorescent chemical lamps, black lights), high-pressure discharge lamps (high-pressure mercury lamps, metal halide lamps), short arc discharge lamps (super-high pressure mercury lamps, xenon lamps, mercury xenon lamps) Etc. can be exemplified. Of these, a metal halide lamp, a xenon lamp, a high-pressure mercury lamp, and the like can be preferably used.

  The method for generating polarized ultraviolet rays is not particularly limited as long as it is a method capable of stably irradiating polarized ultraviolet rays, but a method of irradiating ultraviolet rays through a polarizer that can pass only polarized light in a certain direction is used. it can.

  As such a polarizer, one that is generally used for generation of polarized light can be used. For example, a wire grid polarizer having a slit-shaped opening or a plurality of quartz plates are laminated. Examples thereof include a method of performing polarization separation using a Brewster angle, and a method of using a method of performing polarization separation using a Brewster angle of vapor-deposited multilayer films having different refractive indexes.

The irradiation amount of polarized ultraviolet rays is not particularly limited as long as an alignment region having a desired alignment regulating force can be formed. For example, when the wavelength is 310 nm, 5 mJ / cm ^{2 to} 500 mJ / cm. preferably ² is in the ^range, more preferably in the range of ^{7mJ / cm 2 ~300mJ / cm 2} , and still more preferably in the range of ^{10mJ / cm 2 ~100mJ / cm 2} . This is because an alignment region having a sufficient alignment regulating force can be formed.

  The irradiation distance of polarized ultraviolet rays, that is, the distance in the conveyance direction of the long film that receives irradiation of polarized ultraviolet rays is not particularly limited as long as it can be the above-mentioned irradiation amount in each exposure process, It can be set as appropriate according to the line speed or the like. When the irradiation distance is short, it becomes easy to achieve high pattern accuracy, and when the irradiation distance is long, the advantage is that an alignment region having a sufficient alignment regulating force can be obtained even when the line speed is high. There is. In addition, as a method of lengthening the irradiation distance, a method of increasing the number of irradiation times of polarized ultraviolet rays in each exposure process or increasing the irradiation area in the transport direction can be exemplified.

  When irradiating the thin film with polarized ultraviolet light, it is preferable to adjust the temperature so that the temperature of the thin film becomes constant. This is because the alignment region can be formed with high accuracy. The temperature of the thin film is preferably 15 ° C to 90 ° C, and more preferably 15 ° C to 60 ° C. Examples of the temperature control method include a method using a temperature control device such as a general heating / cooling device. Specifically, a method using a blower capable of blowing air at a predetermined temperature, a method using a temperature-adjustable as the conveying means, more specifically, a temperature-adjustable conveying roll, The method using a belt conveyor etc. can be mentioned.

<Method for producing retardation film 2>
The retardation film 2 is manufactured through the following steps. First, a retardation layer forming coating solution for applying a retardation layer forming coating solution containing the rod-shaped compound to the pattern alignment layer 12 of the pattern alignment film 1 to form a retardation layer forming layer is applied. I do. Thereafter, the rod-like compound contained in the coating film of the retardation layer forming coating solution has the first alignment region 12A corresponding to the region for the right eye and the region corresponding to the region for the left eye, which the pattern alignment layer 12 has. An alignment process is performed in which rod-shaped compounds are arranged along different alignment directions with respect to the two alignment regions 12B. The retardation layer 13 is formed by these processes.

  Finally, a cutting process for cutting the film into a desired size is performed. The retardation film 2 is produced through the above steps.

[Coating liquid coating treatment for retardation layer formation]
The coating method for the retardation layer forming coating liquid is not particularly limited as long as it is a method capable of stably forming a coating film made of the retardation layer forming coating liquid on the pattern alignment layer 12. The same thing as what was demonstrated by the composition coating process can be illustrated.

  The retardation layer 13 contains a rod-shaped compound, so that the retardation is developed. The degree of the retardation depends on the type of the rod-shaped compound and the thickness of the retardation layer 13. It is to be decided. Accordingly, the thickness of the retardation layer 13 is not particularly limited as long as it is within a range in which a predetermined retardation can be achieved, and is appropriately determined according to the use of the retardation film 2 and the like. It is.

  The thickness of the retardation layer forming layer made of the retardation layer forming coating liquid is in a range such that the in-plane retardation of the retardation layer 13 formed thereafter corresponds to λ / 4 minutes. It is preferable to apply to. Thereby, the linearly polarized light passing through the first phase difference region 4A and the second phase difference region 4B can be made into circularly polarized light that is orthogonal to each other, and as a result, a three-dimensional image can be displayed with higher accuracy. is there.

  When the thickness of the retardation layer 13 is set to a distance within a range in which the in-plane retardation of the retardation layer 13 corresponds to λ / 4 minutes, the specific distance is determined by the rod-shaped compound. It will be determined appropriately depending on the type. When a general rod-shaped compound is used, the distance is in the range of 0.5 μm to 2 μm, but is not limited thereto.

[Orientation treatment]
In the alignment treatment, the rod-shaped compound contained in the coating film of the retardation layer forming coating liquid is converted into a rod shape along different alignment directions of the first alignment region 12A and the second alignment region 12B included in the pattern alignment layer 12. Arrange the compounds. The method for arranging the rod-shaped compounds is not particularly limited as long as the rod-shaped compounds can be arranged in a desired direction. For example, the rod-shaped compounds are heated to a temperature higher than the liquid crystal phase formation temperature.

  The pattern of the retardation layer 13 formed by this process is the same as the pattern of the pattern alignment layer 12, and the first position corresponding to the right eye region is present on the first alignment region 12 A corresponding to the right eye region. A phase difference region 4A is formed, and a second phase difference region 4B corresponding to the region for the left eye is formed on the second alignment region 12B corresponding to the region for the left eye.

  Whether or not the first retardation region 4A and the second retardation region 4B are formed in the retardation layer 13 is determined, for example, when a sample is put in a polarizing plate crossed Nicol and the sample is rotated. It can be evaluated by confirming that the dark line is reversed. At this time, when the pattern composed of the area A for the right eye and the area B for the left eye is fine, it may be observed with a polarizing microscope. Alternatively, the direction (angle) of the slow axis in each pattern may be measured using an AxoScan manufactured by AXOMETRICS (USA).

  The in-plane retardation of the retardation layer 13 is preferably in the range of 100 nm to 160 nm, more preferably in the range of 110 nm to 150 nm, and still more preferably in the range of 120 nm to 130 nm. In the retardation layer 13, the in-plane retardations indicated by the first retardation region 4A and the second retardation region 4B are substantially the same except that the direction of the slow axis is different.

[Drying process]
Subsequently, the coating film of the retardation layer forming coating solution is dried.

  As a method for drying the coating film, 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. Further, the drying method 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 remaining solvent.

  Furthermore, as a method for drying the coating film, a method of applying a drying air adjusted to a certain temperature to the coating film can be used. When using such a drying method, the method is applied to the coating film. The wind speed of the drying air is preferably 3 m / second or less, and particularly preferably 0.5 m / second or less.

  The temperature condition is preferably in the range of 40 ° C to 150 ° C, more preferably in the range of 50 ° C to 120 ° C, and particularly in the range of 55 ° C to 110 ° C. Further preferred. The drying time is preferably in the range of 0.2 to 30 minutes, more preferably in the range of 0.5 to 20 minutes, and particularly in the range of 1 to 10 minutes. More preferably it is. This is because the solvent can be removed stably under these conditions.

  The timing for performing the drying process may be performed after the alignment process or may be performed in parallel with the alignment process.

[Bar compound curing treatment]
When the rod-shaped compound is polymerizable, it may include a curing treatment for polymerizing and curing the polymerizable rod-shaped compound. In addition, as a method for polymerizing the polymerizable rod-shaped compound, it may be arbitrarily determined according to the kind of the polymerizable functional group of the polymerizable rod-shaped compound, but 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 rod-like compound, but it is usually preferable to use ultraviolet light or visible light from the viewpoint of the ease of the apparatus. Specifically, it can be the same as the ultraviolet rays used when forming the pattern alignment layer 12. By undergoing such a curing treatment, they can be polymerized to form a network structure, so that the retardation layer 13 having column stability and excellent optical properties can be obtained. Can be formed.

  EXAMPLES Hereinafter, although an Example demonstrates this invention further more concretely, this invention is not limited to a following example.

<Example 1>
100 parts by mass of a photo-alignment material (trade name: ROP-103, manufactured by Rorick) having both a photodimerization site and a thermal crosslinking site and 25 parts by mass of PETA are mixed into 900 parts by mass of a mixed solvent of PGME, IPA and CHN. The composition for pattern orientation layers which concerns on Example 1 was obtained by making it melt | dissolve. The ratio of PGME, IPA, and CHN in the mixed solvent was 75: 20: 5 by volume.

  Then, the film thickness after curing the composition for pattern alignment layer on the back surface of a TAC base material (trade name: TD60UL-P, thickness: 60 μm, manufactured by Fuji Film Co., Ltd.) whose surface has been antiglare treated. Was applied by a die coating method so that the thickness became 200 nm. And it heated on 100 degreeC and the conditions for 2 minutes on the hotplate, the solvent was evaporated, and the acrylic resin composition was thermoset. Thereby, a cured film having a thickness of 200 nm was formed.

For this cured film, polarized ultraviolet rays (with a polarization axis of 45 ° with respect to the film transport direction) that passed through a wire grid were synthesized with chromium in a stripe pattern with a width of 500 μm in the direction parallel to the original film transport direction. Irradiation was performed through a mask formed on quartz. Subsequently, polarized ultraviolet rays (with a polarization axis of −45 ° with respect to the film transport direction) that passed through a wire grid without passing through a mask were irradiated. At this time, “H bulb” (manufactured by Fusion) was used as the ultraviolet irradiation device. The wavelength of polarized ultraviolet light was 313 nm, and the integrated light quantity was 40 mJ / cm ² . The integrated light quantity was measured using an ultraviolet light quantity meter “UV-351” (manufactured by Oak Manufacturing Co., Ltd.). Through the above steps, a pattern alignment film according to Example 1 was obtained.

Subsequently, a liquid crystal material (trade name: licrive (registered trademark) RMS03-013C, manufactured by Merck & Co., Inc.) dissolved in propylene glycol monomethyl ether acetate (PEGMEA) is deposited on the pattern alignment layer of the pattern alignment film. Was applied by a die coating method so as to be 1 μm. And it heated on 60 degreeC conditions on a hotplate for 2 minutes, and cooled to room temperature vicinity, Then, the ultraviolet-ray with a wavelength of 260 nm was irradiated until the integrated light quantity became 300 mJ / cm < ² > using the said ultraviolet irradiation device. The retardation film according to Example 1 was obtained through the above steps.

<Example 2>
Except that the mass ratio of the acrylic resin composition to the PETA is 100: 20, the pattern alignment layer composition, the pattern alignment film, and the phase difference according to Example 2 are obtained in the same manner as in Example 1. A film was obtained.

<Example 3>
Except that the mass ratio of the acrylic resin composition to the PETA is 100: 15, the pattern alignment layer composition, the pattern alignment film, and the phase difference according to Example 3 are obtained in the same manner as in Example 1. A film was obtained.

<Comparative Example 1>
Except that the mass ratio of the acrylic resin composition to the PETA is 100: 30, the pattern alignment layer composition, the pattern alignment film, and the phase difference according to Comparative Example 1 are obtained in the same manner as in Example 1. A film was obtained.

<Comparative example 2>
Except that the mass ratio of the acrylic resin composition and the PETA is 100: 0, the pattern alignment layer composition, the pattern alignment film, and the phase difference according to Comparative Example 2 are obtained in the same manner as in Example 1. A film was obtained.

<Comparative Example 3>
Except that the mass ratio of the acrylic resin composition and the PETA is 0: 100, the pattern alignment layer composition, the pattern alignment film, and the phase difference according to Comparative Example 3 are the same as in Example 1. A film was obtained.

<Appearance evaluation>
First, the external appearance of the retardation film which concerns on an Example and a comparative example was evaluated. Appearance evaluation is carried out by attaching polarizing plates (trade name: HCL2-5618HCS, manufactured by Sanlitz) on both sides of the retardation film so as to be in a crossed Nicol arrangement, and placing the bonded members on a liquid crystal backlight. The degree of cloudiness on the front was visually observed in a dark room. The case where the degree of white turbidity was small and no orientation failure was observed was indicated as “◯”, and the case where the degree of white turbidity was high and orientation failure was observed was indicated as “x”. The results are shown in Table 2.

<Evaluation of in-plane retardation>
The in-plane retardation was evaluated by measuring the Re value according to the parallel Nicol rotation method using a phase difference measuring device KOBRA-WR (manufactured by Oji Scientific Instruments). The case where the Re value is in the range of 100 nm to 160 nm is “◯”, and the case where it is not is “X”. The results are shown in Table 2.

<Evaluation of adhesion>
The evaluation of adhesion was performed by carrying out a crosscut according to the JIS K5400-8.5 method using a mending tape (manufactured by Sumitomo 3M). A case where 80% or more remained was designated as “◎”, a case where 40% or more remained was designated as “◯”, and a case where less than 40% was designated as “X”.

  A phase difference film using a photo-alignment material having a photo-alignment property, a solvent for dissolving the photo-alignment material, and a composition for a pattern alignment layer containing a polyfunctional acrylate has a photo-alignment property and adhesion to a TAC substrate. It was confirmed that it was excellent in both the properties (Examples 1 to 3). In that case, it was confirmed that the content of the polyfunctional acrylate is preferably 10 parts by mass or more and less than 30 parts by mass with respect to 100 parts by mass of the photo-alignment material.

  On the other hand, when the content of the polyfunctional acrylate was 30 parts by mass or more, it was confirmed that sufficient photoalignment could not be obtained and it was not preferable (Comparative Examples 1, 3). Moreover, it was confirmed that sufficient adhesiveness with a TAC base material was not acquired as content of polyfunctional acrylate is less than 10 mass parts (comparative example 2).

DESCRIPTION OF SYMBOLS 1 Pattern alignment film 2 Pattern retardation film 11 Base material 12 Pattern alignment layer 13 Retardation layer

Claims (6)

A composition for a pattern alignment layer for forming a pattern alignment layer containing a photo-alignment material that exhibits photo-alignment properties upon irradiation with polarized light on a substrate,
The composition for pattern orientation layers containing the said photo-alignment material, the solvent which melt | dissolves this photo-alignment material, and polyfunctional acrylate.   Content of the said polyfunctional acrylate is a composition for pattern orientation layers of Claim 1 which is 10 mass parts or more and less than 30 mass parts with respect to 100 mass parts of said photo-alignment materials.   The manufacturing method of the pattern orientation film which heat-drys after applying the composition for pattern orientation layers of Claim 1 or 2 on a base material, and further forms a pattern orientation layer which has different photo-orientation property by polarization pattern irradiation.   The method for producing a pattern alignment film according to claim 3, wherein the substrate is triacetylcellulose.   The method for producing a pattern alignment film according to claim 3 or 4, wherein the thickness of the pattern alignment layer is from 100 nm to 1000 nm.   A step of forming a retardation layer containing a rod-like compound exhibiting liquid crystallinity and having a polymerizable functional group in a molecule on the pattern alignment layer of the pattern alignment film obtained by the production method according to claim 3. The manufacturing method of the pattern phase difference film which has this.

Images