WO2020085307A1 - Film d'alignement permettant de transférer une couche d'alignement de composé de cristaux liquides - Google Patents

Film d'alignement permettant de transférer une couche d'alignement de composé de cristaux liquides Download PDF

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Publication number
WO2020085307A1
WO2020085307A1 PCT/JP2019/041323 JP2019041323W WO2020085307A1 WO 2020085307 A1 WO2020085307 A1 WO 2020085307A1 JP 2019041323 W JP2019041323 W JP 2019041323W WO 2020085307 A1 WO2020085307 A1 WO 2020085307A1
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Prior art keywords
film
alignment
layer
liquid crystal
crystal compound
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PCT/JP2019/041323
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English (en)
Japanese (ja)
Inventor
佐々木　靖
村田　浩一
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東洋紡株式会社
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Priority to KR1020217007116A priority Critical patent/KR20210082159A/ko
Priority to JP2020553395A priority patent/JPWO2020085307A1/ja
Priority to CN201980064549.8A priority patent/CN112805136B/zh
Publication of WO2020085307A1 publication Critical patent/WO2020085307A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3016—Polarising elements involving passive liquid crystal elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
    • B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B23/00—Layered products comprising a layer of cellulosic plastic substances, i.e. substances obtained by chemical modification of cellulose, e.g. cellulose ethers, cellulose esters, viscose
    • B32B23/04—Layered products comprising a layer of cellulosic plastic substances, i.e. substances obtained by chemical modification of cellulose, e.g. cellulose ethers, cellulose esters, viscose comprising such cellulosic plastic substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B23/08—Layered products comprising a layer of cellulosic plastic substances, i.e. substances obtained by chemical modification of cellulose, e.g. cellulose ethers, cellulose esters, viscose comprising such cellulosic plastic substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/28—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02—Physical, chemical or physicochemical properties
    • B32B7/023—Optical properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • 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
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/08—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of polarising materials
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/07—Flat, e.g. panels
    • B29C48/08—Flat, e.g. panels flexible, e.g. films
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/42—Polarizing, birefringent, filtering
    • 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
    • C08J2301/02—Cellulose; Modified cellulose

Definitions

  • the present invention relates to a transfer film for transferring a liquid crystal compound alignment layer. More specifically, when manufacturing a polarizing plate or a retardation plate such as a circularly polarizing plate in which a retardation layer composed of a liquid crystal compound alignment layer is laminated, or when manufacturing a polarizing plate having a polarizing layer composed of a liquid crystal compound alignment layer.
  • the present invention relates to a transfer film for transferring a liquid crystal compound alignment layer.
  • a circularly polarizing plate is arranged on the viewer-side panel surface of the image display panel in order to reduce reflection of extraneous light.
  • This circularly polarizing plate is composed of a laminated body of a linearly polarizing plate and a retardation film such as ⁇ / 4, and converts external light traveling toward the panel surface of the image display panel into linearly polarized light by the linearly polarizing plate, and then ⁇ / It is converted into circularly polarized light by a retardation film such as 4.
  • Circularly polarized extraneous light reverses the direction of rotation of the polarization plane when reflected on the surface of the image display panel, and this reflected light is conversely shielded by a linear polarizing plate by a retardation film such as ⁇ / 4. Since the light is converted into linearly polarized light in the direction indicated by the arrow and is then shielded by the linearly polarizing plate, it is possible to suppress the emission to the outside.
  • the circularly polarizing plate is formed by laminating a retardation film such as ⁇ / 4 on the polarizing plate.
  • a single retardation film such as a cyclic olefin (see Patent Document 1), polycarbonate (see Patent Document 2), or a stretched film of triacetyl cellulose (see Patent Document 3) is used.
  • a retardation film of a laminate having a retardation layer made of a liquid crystal compound on a transparent film see Patent Documents 4 and 5) is used. It is described above that the liquid crystal compound may be transferred when the retardation layer made of the liquid crystal compound is provided.
  • Patent Document 6 a method for producing a retardation film by transferring a retardation layer made of a liquid crystal compound to a transparent film is known from Patent Document 6 and the like.
  • Patent Documents 7 and 8 a method of forming a ⁇ / 4 film by providing a retardation layer made of a liquid crystal compound such as ⁇ / 4 on a transparent film by such a transfer method.
  • the stretched film is superior in mechanical strength to the unstretched film and is preferable as a film base material for transfer, but since it has birefringence, it was difficult to evaluate the retardation layer.
  • a biaxially stretched polyester film is relatively inexpensive and has excellent mechanical strength and heat resistance, and in these respects, it is highly preferable as a film base material for transfer, but a polyester film has a large birefringence. It is difficult to evaluate the retardation layer in the state where the liquid crystal compound alignment layer (retardation layer) is laminated on the film base material because of the property.
  • a retardation layer in a stretched film it is evaluated after transferring to an object (other transparent resin film, polarizing plate, etc.), or the retardation layer is peeled and evaluated only with the retardation layer. Or, it was necessary to transfer it to glass or the like for evaluation.
  • the method of evaluation after transfer to an object was inferior in productivity because it was necessary to dispose of a normal product such as a polarizing plate as a nonstandard product when there was a problem in the retardation layer.
  • the method of peeling off the retardation layer has a problem that the retardation layer cannot be evaluated if it becomes thin.
  • the method of peeling and evaluation and the method of transferring to glass were sample extraction evaluation, and the total amount could not be evaluated.
  • the stretched film is excellent in mechanical strength as compared with the unstretched film and is preferable as a film substrate for transfer, but the orientation direction of the transferred retardation layer does not become the orientation direction as designed, and there is a problem that it deviates from it. It often happened.
  • a polarizing plate having a retardation in the alignment direction deviated from such a design is used for a display, problems such as light leakage may occur.
  • a stretched polyester film such as a biaxially stretched polyester film is relatively inexpensive and has excellent mechanical strength and heat resistance, and in these respects, it is highly preferable as a film base material for transfer. In the case of the film, the problem of the deviation of the alignment direction and the light leakage due to the deviation was particularly remarkable.
  • a polyester film such as a biaxially stretched polyester film is relatively inexpensive and has excellent mechanical strength and heat resistance, and in these respects, it is highly preferable as a film base material for transfer.
  • a film substrate for transfer in the process of forming a retardation layer (liquid crystal compound alignment layer) on it to produce a laminate, haze of the film is increased, or foreign matter is generated in the film. There was a problem with. Due to such increased haze and foreign matter, there is a problem in that the polarized light is disturbed at the time of ultraviolet irradiation for controlling the alignment of the liquid crystal compound, and the alignment direction does not reach the designed direction.
  • a method for producing a polarizing plate by transferring a polarizing layer (liquid crystal compound alignment layer) containing a liquid crystal compound and a dichroic dye laminated on a transfer film to a protective film has also been known. Also had the same problem as above.
  • the present invention has been made against the background of such problems of the conventional technology. That is, the first object of the present invention is to provide a liquid crystal provided on a transfer film while using an inexpensive stretched film such as polyester having excellent mechanical strength as a transfer film for transferring a liquid crystal compound alignment layer. An object of the present invention is to provide a transfer film capable of evaluating the alignment state of a compound alignment layer (retardation layer or polarizing layer) even when it is laminated on the transfer film.
  • the second object of the present invention is to use a stretched film such as polyester which is inexpensive and excellent in mechanical strength as a transfer film for transferring the liquid crystal compound alignment layer, and the alignment direction of the transferred retardation layer or polarizing layer.
  • the present invention intends to provide a transfer film which can reduce the problem of deviation of the film, can transfer the retardation layer or the polarizing layer in the designed orientation, and can prevent the problem of light leakage of the display. .
  • a third object of the present invention is to use a stretched film such as polyester, which is inexpensive and has excellent mechanical strength, as a transfer film for transferring a liquid crystal compound alignment layer, while using a retardation layer or a polarizing layer ( (Liquid crystal compound alignment layer)
  • a retardation layer or a polarizing layer (Liquid crystal compound alignment layer)
  • the present invention is intended to provide a transfer film capable of achieving the above.
  • the present inventor as a result of diligent studies to achieve the first object, as an orientation film, the orientation direction, and a position where the angle between the orientation direction of the orientation film or the direction orthogonal to the orientation direction becomes the maximum. Even by using the one controlled to a specific angle or less, the above-mentioned conventional problems do not occur, and the evaluation of the retardation phase is excellent even in the state where the liquid crystal compound alignment layer is laminated on the alignment film. I found that I could do it.
  • the orientation direction of the transferred retardation layer or polarizing layer is in the orientation direction as designed. I examined the cause that does not happen.
  • the stretched film of the substrate undergoes thermal contraction to some extent by the heat treatment when the liquid crystal compound is aligned on the stretched film as the substrate to form the retardation layer or the polarizing layer. Distortion occurs in the base film after heat shrinkage due to the large difference in the two orthogonal directions of the film, and this distortion adversely affects the orientation direction of the retardation layer or polarizing layer formed on the base film.
  • the orientation direction of the retardation layer or the polarizing layer deviates from the orientation direction as designed in order to give the above. Then, as a result of earnest studies on the method for effectively preventing this distortion of the base film, the present inventor has found that the oriented film as the base film has a flow direction (MD direction) and a direction orthogonal to the flow direction. Even if there is a variation in the heat shrinkage ratio of the film with (TD direction), by using a film whose difference is controlled within a specific range, the above-mentioned conventional problems do not occur, and the design is achieved. It was found that the retardation layer and the polarizing layer can be transferred with the orientation of, and the problem of light leakage does not occur.
  • the present inventor in order to achieve the third object, when a conventional stretched polyester film is used as a film substrate for transfer, a retardation layer or a polarizing layer (liquid crystal compound alignment layer) on the film
  • a retardation layer or a polarizing layer liquid crystal compound alignment layer
  • the polyester resin that constitutes the polyester film inevitably contains an ester cyclic trimer (oligomer) as a by-product of the reaction during the polymerization in the manufacturing process thereof.
  • the present inventor has diligently studied a method of effectively preventing such rise of haze and generation of foreign matter during the heat treatment of the oriented polyester film for transfer, and as a result, the oligomer deposition amount of the polyester film falls within a specific range. It has been found that the use of a controlled one can form a retardation layer or a polarizing layer (liquid crystal compound alignment layer) having an alignment as designed without causing the above-mentioned conventional problems.
  • the invention for achieving the first object has the following configurations (1) to (6).
  • An alignment film for transferring a liquid crystal compound alignment layer to an object wherein an angle between an alignment direction of the alignment film and a flow direction of the alignment film or a direction orthogonal to the flow direction is a width of the film. Maximum of 14 degrees or less among the values measured at 5 points in the direction, 5 cm inward from each end, the central part, and the intermediate part between the central part and both ends.
  • An alignment film for transferring a liquid crystal compound alignment layer which comprises: (2) The alignment film for transferring a liquid crystal compound alignment layer according to (1), wherein the alignment film has an alignment angle difference of 7 degrees or less in the width direction.
  • a liquid crystal compound alignment layer comprising a laminate of a liquid crystal compound alignment layer and an alignment film, wherein the alignment film is the alignment film according to any one of (1) to (3). Transfer laminate.
  • a liquid crystal compound alignment layer comprising a step of irradiating linearly polarized light having an electric field vibration direction parallel to a direction orthogonal to the flow direction from the alignment film surface of the laminate and receiving light on the liquid crystal compound alignment layer surface side. Inspection method of transfer laminate.
  • the invention for achieving the second object has the following configurations (1) to (6).
  • An alignment film for transferring an alignment layer of a liquid crystal compound to an object which has a heat shrinkage ratio of 150 ° C. for 30 minutes in the flow direction of the alignment film and 150 in a direction orthogonal to the flow direction of the alignment film.
  • An alignment film for transferring a liquid crystal compound alignment layer which has a difference from the heat shrinkage ratio at 30 ° C. of 30 minutes of 4% or less.
  • Thermal shrinkage of 150 ° C. for 30 minutes in the direction of 45 ° with respect to the flow direction of the oriented film and thermal shrinkage of 150 ° C. for 30 minutes in the direction of 135 ° with respect to the flow direction of the oriented film.
  • the alignment film for transferring a liquid crystal compound alignment layer according to (1) Is 4% or less, the alignment film for transferring a liquid crystal compound alignment layer according to (1).
  • a method for manufacturing a polarizing plate laminated with a liquid crystal compound alignment layer A method for manufacturing a polarizing plate laminated with a liquid crystal compound alignment layer.
  • a liquid crystal compound alignment layer comprising a step of irradiating linearly polarized light having an electric field vibration direction parallel to a direction orthogonal to the flow direction from the alignment film surface of the laminate and receiving light on the liquid crystal compound alignment layer surface side. Inspection method of transfer laminate.
  • the invention for achieving the third object has the following configurations (1) to (6).
  • An oriented polyester film for transferring a liquid crystal compound orientation layer to an object, wherein the amount of the ester cyclic trimer deposited on the surface of the release surface of the oriented polyester film after heating at 150 ° C. for 90 minutes is An oriented polyester film for transferring a liquid crystal compound orientation layer, which is 1.0 mg / m 2 or less.
  • a liquid crystal comprising a liquid crystal compound alignment layer and an alignment polyester film, wherein the alignment polyester film is the alignment polyester film according to any one of (1) to (3).
  • Liquid crystal comprising a step of irradiating linearly polarized light having an electric field vibration direction parallel to the flow direction or a direction orthogonal to the flow direction from the oriented polyester film surface of the laminate, and receiving light on the liquid crystal compound alignment layer surface side.
  • the orientation state of the liquid crystal compound alignment layer (retardation layer or polarizing layer) provided on the alignment film is aligned while using an inexpensive stretched film such as polyester having excellent mechanical strength. It can also be evaluated in a state of being laminated on a film.
  • the second invention it is possible to transfer the retardation layer or the polarizing layer in the orientation as designed while using a stretched film such as polyester which is inexpensive and has excellent mechanical strength, and thus the problem of light leakage of the display is reduced. Can be prevented.
  • an alignment retardation layer or a polarizing layer can be formed.
  • the alignment film of the first invention is for transferring a liquid crystal compound alignment layer to an object (other transparent resin film, polarizing plate, etc.), and has an alignment direction of the alignment film and a flow direction or flow of the alignment film.
  • the angle between the direction orthogonal to the direction is 14 degrees or less at the maximum position.
  • the alignment film of the second invention is for transferring the liquid crystal compound alignment layer to an object (other transparent resin film, polarizing plate, etc.), and is 150 ° C. 30 in the flow direction (MD direction) of the alignment film.
  • the difference between the heat shrinkage ratio for 30 minutes and the heat shrinkage ratio for 30 minutes at 150 ° C. in the direction (TD direction) orthogonal to the flow direction of the oriented film is 4% or less.
  • the oriented polyester film of the third invention is for transferring an alignment layer of a liquid crystal compound to an object (other transparent resin film, polarizing plate, etc.), and is an oriented polyester film after heating at 150 ° C. for 90 minutes.
  • the amount of the ester cyclic trimer deposited on the surface of the release surface is 1.0 mg / m 2 or less.
  • the oriented polyester film may be simply referred to as an oriented film.
  • polyester polycarbonate, polystyrene, polyamide, polypropylene, cyclic polyolefin and triacetyl cellulose are more preferable, polyester is more preferable, and polyethylene terephthalate is particularly preferable.
  • Orientation film may be composed of a single layer or a plurality of layers by co-extrusion.
  • the surface layer (release layer A) / back surface layer (B), A / intermediate layer (C) / A (release surface layer and back surface layer are the same), A / C / B , And the like.
  • the film When the film is stretched, it may be uniaxially stretched, weakly biaxially stretched (stretched in biaxial directions but weak in one direction), or biaxially stretched, but the orientation direction is wide in the width direction.
  • the uniaxial stretching or the weak biaxial stretching is preferable from the viewpoint that the temperature can be kept constant.
  • the main orientation direction is the latter stretching direction.
  • the stretching direction In the case of uniaxial stretching, the stretching direction may be the flow direction of film production (longitudinal direction) or the direction orthogonal thereto (transverse direction).
  • biaxial stretching it may be simultaneous biaxial stretching or sequential biaxial stretching. Stretching in the longitudinal direction is preferably stretching by rolls having different speed differences, and stretching in the transverse direction is preferably tenter stretching.
  • Oriented films for transfer are industrially supplied by rolls around which the film is wound.
  • the lower limit of the roll width is preferably 30 cm, more preferably 50 cm, further preferably 70 cm, particularly preferably 90 cm, and most preferably 100 cm.
  • the upper limit of the roll width is preferably 5000 cm, more preferably 4000 cm, and further preferably 3000 cm.
  • the lower limit of the roll length is preferably 100 m, more preferably 500 m, even more preferably 1000 m.
  • the upper limit of the roll length is preferably 100,000 m, more preferably 50,000 m, and further preferably 30,000 m.
  • a polarizer in which polyvinyl alcohol is stretched in the flow direction of the film, and iodine or an organic compound dichroic dye is absorbed in the polarizer.
  • the extinction axis (absorption axis) of the polarizer is It is in the flow direction.
  • the slow axis (orientation direction) of a ⁇ / 4 layer as a retardation layer is laminated at 45 degrees with respect to the extinction axis, or the ⁇ / 4 layer and the ⁇ / 2 layer are oblique (10 Laminated up to 80 degrees).
  • the optical compensation layer used in the liquid crystal display is also laminated in an oblique direction with respect to the extinction axis of the polarizer.
  • the orientation state of the retardation layer is, for example, irradiating the retardation layer with linearly polarized light having a vibration direction parallel to or perpendicular to the flow direction of the film from the transfer orientation film side, and becomes elliptically polarized light in the retardation layer.
  • the received light is detected by the light receiving element through the light receiving side retardation plate for returning the elliptically polarized light to the linearly polarized light and the light receiving side polarizing plate installed in the direction that does not pass the linearly polarized light returned by the phase difference plate ( Can be evaluated).
  • the light passing through the light receiving side retardation plate becomes linearly polarized when the retardation and orientation direction as designed for the retardation layer provided on the transfer orientation film are in the extinction state, It can be seen that it is a retardation layer. On the contrary, if there is light leakage, it can be seen that it is out of design.
  • the linearly polarized light passing through the transfer orientation film becomes elliptically polarized light, which causes light leakage. Occurs, which makes it difficult to accurately evaluate the retardation layer.
  • the present invention enables accurate evaluation of the retardation layer by minimizing this shift.
  • the lower limit of the angle (maximum location) between the MD or TD and the orientation direction of the transfer oriented film of the present invention is preferably 0 degree.
  • the upper limit of the angle between the MD or TD and the orientation direction of the transfer orientation film of the present invention is preferably 14 degrees at the maximum, more preferably 7 degrees, and further preferably 5 degrees. , Particularly preferably 4 degrees, and most preferably 3 degrees. If it exceeds the above range, it may be difficult to evaluate the alignment state of the retardation layer (liquid crystal compound alignment layer).
  • the lower limit of the angle difference of the orientation angle in the entire width (width direction) of the transfer oriented film of the present invention is preferably 0 degree.
  • the upper limit of the angle difference of the orientation angle in the entire width of the orientation film for transfer of the present invention is preferably 7 degrees, more preferably 5 degrees, further preferably 3 degrees, particularly preferably 2 degrees. is there. If it exceeds the above range, it may be difficult to evaluate the alignment state of the retardation layer (liquid crystal compound alignment layer) in the width direction.
  • the film shrinks in the MD direction in the stretching zone and heat setting zone.
  • the edges of the film are fixed with clips, but the central part is not fixed, so there is a bowing phenomenon that emerges behind the bow at the tenter exit. This becomes a strain in the alignment direction.
  • the orientation direction does not fall within the specified range for the entire width of the formed film, it is preferable to adopt a portion within the above characteristic range, such as the vicinity of the central portion of the stretched wide film.
  • the strain in the orientation direction tends to be small, so that it is also preferable to employ a weakly biaxially or uniaxially stretched film.
  • a weakly biaxially or uniaxially stretched film whose MD direction is the main orientation direction is preferable.
  • the orientation direction of the transfer orientation film and the angle between the orientation direction of the orientation film and the direction orthogonal to the direction of the orientation film, and the orientation angle difference in the width direction of the film are as follows. It is determined. First, the film was pulled out from the roll, and the orientation direction was determined at five positions, both ends (5 cm inward from each end), the central part, and the intermediate part between the central part and the both ends. An intermediate portion between the central portion and both end portions is at a position where the distance between the central portion and both end portions is divided into two equal parts. The orientation direction was the slow axis direction of the film obtained by using a molecular orientation meter.
  • the orientation direction of the entire film was close to the machine direction (MD) or the width direction (TD). Then, when the orientation direction of the entire film is close to the flow direction, the angle between the orientation direction and the flow direction of the film is obtained at each of the above five locations, and the value at the location having the largest angle is “ It was adopted as the maximum value of the “angle between the orientation direction of the orientation film and the flow direction of the orientation film”. On the other hand, when the orientation direction of the entire film is close to the width direction, the angle between the orientation direction and the direction orthogonal to the flow direction of the film is determined at each of the above 5 locations, and the angle becomes the largest.
  • the difference between the maximum value and the minimum value among the angles obtained at the above-mentioned 5 places was defined as "the angular difference in the orientation angle in the width direction of the film”.
  • the angle is a positive value when the orientation direction is on the same side as the maximum value with respect to the longitudinal direction or the width direction, and a negative value when the orientation direction is on the opposite side to the longitudinal direction or the width direction.
  • the minimum value is evaluated by distinguishing between positive and negative.
  • the lower limit of the difference in heat shrinkage ratio between the MD direction and the TD direction of the transfer film of the present invention at 150 ° C. for 30 minutes in the MD direction is preferably 0%.
  • the upper limit of the difference in the heat shrinkage ratio between the MD direction and the TD direction of the transfer film of the present invention in the MD direction and the TD direction at 150 ° C. for 30 minutes is preferably 4%, more preferably 3%, and further preferably 2%. , Particularly preferably 1.5%, most preferably 1%.
  • the alignment process of the liquid crystal compound requires a high temperature, or when a plurality of liquid crystal compounds are stacked and the temperature history increases, the alignment direction of the liquid crystal compound deviates from the design and the polarizing plate is used for a display. There may be light leakage.
  • the lower limit of the heat shrinkage rate of the oriented film for transfer of the present invention in the MD direction at 150 ° C. for 30 minutes is preferably ⁇ 2%, more preferably ⁇ 0.5%, further preferably ⁇ 0.1%. Yes, particularly preferably 0%, and most preferably 0.01%. If it is less than the above, it may be difficult to achieve the numerical value.
  • the upper limit of the heat shrinkage rate of the oriented film for transfer of the present invention in the MD direction at 150 ° C. for 30 minutes is preferably 4%, more preferably 3%, further preferably 2.5%, and particularly It is preferably 2%, most preferably 1.5%. If it exceeds the above range, it may be difficult to adjust the difference in thermal shrinkage. Further, the flatness may be deteriorated and the workability may be deteriorated.
  • the lower limit of the heat shrinkage ratio of the oriented film for transfer of the present invention in the TD direction at 150 ° C. for 30 minutes is preferably ⁇ 2%, more preferably ⁇ 0.5%, further preferably ⁇ 0.1%. Yes, particularly preferably 0%, and most preferably 0.01%. If it is less than the above, it may be difficult to achieve the numerical value.
  • the upper limit of the heat shrinkage rate of the oriented film for transfer of the present invention in the TD direction at 150 ° C. for 30 minutes is preferably 4%, more preferably 2.5%, further preferably 2%, and particularly It is preferably 1.5%, most preferably 1%. If it exceeds the above range, it may be difficult to adjust the difference in thermal shrinkage. Further, the flatness may be deteriorated and the workability may be deteriorated.
  • the lower limit of the difference in heat shrinkage ratio between the MD direction and the MD direction of the transfer oriented film of the present invention at 150 ° C. for 30 minutes in the direction of 45 ° and the direction of 135 ° is preferably 0%. If it is less than the above, it may be difficult to achieve the numerical value.
  • the upper limit of the difference in heat shrinkage ratio between the MD direction and the MD direction of the transfer oriented film of the present invention at 150 ° C. for 30 minutes in the direction of 45 ° and the direction of 135 ° is preferably 4%, It is preferably 3%, more preferably 2%, particularly preferably 1.5%, most preferably 1%. Outside of the above range, the alignment direction of the liquid crystal compound may deviate from the design, and light leakage may occur when the polarizing plate is used for a display.
  • the heat shrinkage characteristics of the film can be adjusted by stretching temperature, stretching ratio, heat setting temperature, relaxation process ratio, relaxation process temperature, etc. It is also preferable to release the film from the clip and wind it when the surface temperature of the film is 100 ° C. or higher during the cooling step.
  • the release from the clip may be performed by either opening the clip or cutting off the end held by the clip with a blade or the like. Further, it is also an effective method to perform heat treatment (annealing treatment) off-line.
  • the material for the transfer oriented film is preferably polyester, particularly polyethylene terephthalate.
  • the lower limit of 95 ° C. maximum heat shrinkage of the oriented film for transfer of the present invention is preferably 0%, more preferably 0.01%. If it is less than the above, it may be difficult to achieve the numerical value.
  • the upper limit of the 95 ° C. maximum heat shrinkage rate of the oriented film for transfer of the present invention is preferably 2.5%, more preferably 2%, further preferably 1.2%, and particularly preferably 1%. %, And most preferably 0.8%. Above the above range, light leakage may occur when the polarizing plate is used for a display.
  • the lower limit of the angle between the maximum heat shrinkage ratio direction and the MD or TD direction of the oriented film for transfer of the present invention is preferably 0 degree.
  • the upper limit of the angle between the maximum heat shrinkage direction and the MD or TD direction of the transfer oriented film of the present invention is preferably 20 degrees, more preferably 15 degrees, and further preferably 10 degrees, and particularly It is preferably 7 degrees, and most preferably 5 degrees.
  • the alignment direction of the liquid crystal compound may deviate from the design, and light leakage may occur when the polarizing plate is used for a display.
  • the lower limit of the elastic modulus in the MD direction and the elastic modulus in the TD direction of the transfer oriented film of the present invention is preferably 1 GPa, more preferably 2 GPa. If it is less than the above value, elongation may occur during each step, and the orientation direction may not be as designed.
  • the upper limit of the elastic modulus in the MD direction and the elastic modulus in the TD direction of the transfer oriented film of the present invention is preferably 8 GPa, more preferably 7 GPa. Beyond the above, it may be difficult to achieve the numerical value in reality.
  • the transfer oriented film of the present invention is a polyethylene terephthalate film
  • the amount of ester cyclic trimer deposited on the surface of the release surface of the oriented polyester film after heating at 150 ° C. for 90 minutes (hereinafter referred to as surface oligomer deposition amount (hereinafter referred to as surface oligomer deposition amount (hereinafter referred to as surface oligomer deposition amount (hereinafter referred to as surface oligomer deposition amount (hereinafter referred to as surface oligomer deposition amount (hereinafter referred to as surface oligomer deposition amount (hereinafter referred to as surface oligomer deposition amount (hereinafter referred to as surface oligomer deposition amount (hereinafter referred to as surface oligomer deposition amount (hereinafter referred to as surface oligomer deposition amount (hereinafter referred to as surface oligomer deposition amount (hereinafter referred to as surface oligomer deposition amount (hereinafter
  • the “release surface” of the alignment film means, of the surfaces of the alignment film, the surface intended to be provided with the liquid crystal compound alignment layer transferred by the alignment film.
  • an oligomer block coat layer, a flattening coat layer, a release layer, etc. are provided, and if a liquid crystal compound alignment layer is provided thereon, the surface of the oligomer block coat layer, the flattening layer, the release layer, etc. (The surface in contact with the liquid crystal compound alignment layer) is the "release surface" of the alignment film.
  • oligomer block coat layer on the surface of the oriented film for transfer, which blocks the deposition of oligomer (ester cyclic trimer).
  • the oligomer block coat layer preferably contains 50% by weight or more of a resin having a Tg of 90 ° C. or higher.
  • a resin having a Tg of 90 ° C. or higher amino resins such as melamine, alkyd resins, polystyrene, acrylic resins and the like are preferable.
  • the upper limit of Tg of the resin is preferably 200 ° C.
  • the lower limit of the thickness of the oligomer block coat layer is preferably 0.01 ⁇ m, more preferably 0.03 ⁇ m, and further preferably 0.05 ⁇ m. If it is less than the above, a sufficient blocking effect may not be obtained.
  • the upper limit of the thickness of the oligomer block coat layer is preferably 10 ⁇ m, more preferably 5 ⁇ m, further preferably 2 ⁇ m. If it exceeds the above range, the effect may be saturated.
  • the content of the oligomer (ester cyclic trimer) in the polyester resin that constitutes the release surface side layer of the alignment film for transfer (hereinafter, referred to as surface layer oligomer content) It is also preferable to lower.
  • the lower limit of the surface layer oligomer content is preferably 0.3% by mass, more preferably 0.33% by mass, and further preferably 0.35% by mass. If it is less than the above, it may be difficult to achieve the numerical value.
  • the upper limit of the surface layer oligomer content is preferably 0.7% by mass, more preferably 0.6% by mass, and further preferably 0.5% by mass.
  • the "release surface side layer" of an orientation film means the layer in which the release surface exists among each layer of the polyester which comprises an orientation film.
  • the film even when the film is a single layer, it may be referred to as a release surface side layer.
  • the back surface side layer and the release surface side layer described later are the same layer.
  • the lower limit of the oligomer content in the raw material polyester is preferably 0.23% by mass, more preferably 0.25% by mass, and further preferably 0.27% by mass.
  • the upper limit of the oligomer content in the raw material polyester is preferably 0.7% by mass, more preferably 0.6% by mass, and further preferably 0.5% by mass.
  • the oligomer content in the raw material polyester can be reduced by subjecting the polyester in a solid state to heat treatment at a temperature of 180 ° C. or higher and a melting point or lower, such as solid phase polymerization. It is also preferred to deactivate the polyester catalyst.
  • the lower limit of the intrinsic viscosity (IVf) of the polyester constituting the film is preferably 0.45 dl / g, more preferably 0.5 dl / g, and further preferably Is 0.53 dl / g. If it is less than the above, the impact resistance of the film may be poor. In addition, it may be difficult to form a film, or the uniformity of thickness may be poor.
  • the upper limit of IVf is preferably 0.9 dl / g, more preferably 0.8 dl / g, and further preferably 0.7 dl / g. If it exceeds the above range, the heat shrinkage ratio may increase. In addition, film formation may be difficult.
  • the lower limit of the light transmittance of the oriented film for transfer of the present invention at a wavelength of 380 nm is preferably 0%.
  • the upper limit of the light transmittance of the transfer oriented film of the present invention at a wavelength of 380 nm is preferably 20%, more preferably 15%, further preferably 10%, and particularly preferably 5%. .
  • the direction uniformity of the alignment layer or the liquid crystal compound alignment layer may be deteriorated due to reflection from the back surface in the case of irradiating polarized ultraviolet light to have a specific alignment direction.
  • the light transmittance at a wavelength of 380 nm can be adjusted within the range by adding a UV absorber.
  • the lower limit of haze of the oriented film for transfer of the present invention is preferably 0.01%, more preferably 0.1%. If it is less than the above, it may be difficult to achieve the numerical value.
  • the upper limit of haze of the oriented film for transfer of the present invention is preferably 3%, more preferably 2.5%, further preferably 2%, and particularly preferably 1.7%. If it exceeds the above range, polarized light may be disturbed during irradiation of polarized UV, and the retardation layer or polarizing layer as designed may not be obtained. In addition, light leakage may occur due to irregular reflection at the time of inspecting the retardation layer or the polarizing layer, which makes it difficult to perform the inspection.
  • the lower and lower limits of the haze of the transfer oriented film of the present invention after heating at 150 ° C. for 90 minutes are the same as above.
  • the lower limit of the amount of change in haze of the oriented film for transfer of the present invention before and after heating at 150 ° C. for 90 minutes is preferably 0%.
  • the upper limit is preferably 0.5%, more preferably 0.4%, and further preferably 0.3%.
  • the lower limit of the refractive index nx in the slow axis direction to the refractive index ny in the fast axis direction is preferably 0.005, more preferably 0.01, and further preferably 0. 0.02, particularly preferably 0.03, most preferably 0.04, most preferably 0.05. If it is less than the above, it may be difficult to achieve the numerical value.
  • the upper limit of nx-ny is preferably 0.15, more preferably 0.13, and even more preferably 0.12. Beyond the above, it may be difficult to achieve the numerical value in reality. Particularly, in the case of a polyethylene terephthalate film, the value of nx-ny is preferably the above value.
  • the lower limit of nx-ny is preferably 0.005, more preferably 0.01. If it is less than the above, it may be difficult to achieve the numerical value.
  • the upper limit of nx-ny is preferably 0.05, more preferably 0.04, still more preferably 0.03. Beyond the above, it may be difficult to achieve the numerical value in reality.
  • the lower limit of nx-ny is preferably 0.05, more preferably 0.06. If it is less than the above, the advantage of uniaxial stretching may be diminished.
  • the upper limit of nx-ny is preferably 0.15, more preferably 0.13. Beyond the above, it may be difficult to achieve the numerical value in reality.
  • the lower limit of the refractive index (ny) in the fast axis direction of the transfer oriented film of the present invention is preferably 1.55, more preferably 1.58, and further preferably 1.57.
  • the upper limit of the refractive index (ny) in the fast axis direction of the oriented film for transfer of the present invention is preferably 1.64, more preferably 1.63, and further preferably 1.62.
  • the lower limit of the refractive index (nx) in the slow axis direction of the transfer oriented film of the present invention is preferably 1.66, more preferably 1.67, and further preferably 1.68.
  • the upper limit of the refractive index (nx) in the slow axis direction of the oriented film for transfer of the present invention is preferably 1.75, more preferably 1.73, further preferably 1.72, and particularly It is preferably 1.71.
  • the lower limit of the antistatic property (surface resistance) of the oriented film for transfer of the present invention is preferably 1 ⁇ 10 5 ⁇ / ⁇ , more preferably 1 ⁇ 10 6 ⁇ / ⁇ . Even if it is less than the above, the effect may be saturated, and further effect may not be obtained.
  • the upper limit of the antistatic property (surface resistance) of the oriented film for transfer of the present invention is preferably 1 ⁇ 10 13 ⁇ / ⁇ , more preferably 1 ⁇ 10 12 ⁇ / ⁇ , and further preferably 1 ⁇ . It is 10 11 ⁇ / ⁇ . If it exceeds the above range, cissing due to static electricity may occur or the alignment direction of the liquid crystal compound may be disturbed.
  • the antistatic agent is kneaded into the oriented film for transfer, the antistatic coating layer is provided under or on the opposite surface of the release layer, or the antistatic agent is added to the release layer. Due to the above reasons, it can be set within the above range.
  • Antistatic agents added to antistatic coating layers, release layers and transfer oriented films include conductive polymers such as polyaniline and polythiophene, ionic polymers such as polystyrene sulfonate, tin-doped indium oxide, antimony-doped oxidation.
  • conductive polymers such as polyaniline and polythiophene
  • ionic polymers such as polystyrene sulfonate, tin-doped indium oxide, antimony-doped oxidation.
  • conductive fine particles include tin.
  • a release layer may be provided on the transfer oriented film.
  • the release layer may not be provided. If the adhesion is too low, the surface may be corona treated to adjust the adhesion.
  • the release layer can be formed using a known release agent, and alkyd resins, amino resins, long-chain acrylic acrylates, silicone resins, and fluororesins are preferred examples. These can be appropriately selected according to the adhesion to the transfer material.
  • an easy adhesion layer may be provided as a lower layer of the oligomer block coat layer, the antistatic layer and the release layer.
  • the release surface (A layer surface) of the transfer oriented film of the present invention is preferably smooth.
  • the lower limit of the three-dimensional arithmetic mean roughness (SRa) of the release surface of the transfer oriented film of the present invention is preferably 1 nm, more preferably 2 nm. If it is less than the above, it may be difficult to achieve the numerical value.
  • the upper limit of SRa of the release surface of the transfer oriented film of the present invention is preferably 30 nm, more preferably 25 nm, further preferably 20 nm, particularly preferably 15 nm, and most preferably 10 nm. is there.
  • the lower limit of the three-dimensional ten-point average roughness (SRz) of the release surface of the transfer oriented film of the present invention is preferably 5 nm, more preferably 10 nm, and further preferably 13 nm.
  • the upper limit of SRz of the releasing surface of the transfer oriented film of the present invention is preferably 200 nm, more preferably 150 nm, further preferably 120 nm, particularly preferably 100 nm, and most preferably 80 nm. is there.
  • the lower limit of the maximum height of the release surface (SRy: maximum release surface peak height SRp + release surface maximum valley depth SRv) of the oriented film for transfer of the present invention is preferably 10 nm, more preferably 15 nm, More preferably, it is 20 nm.
  • the upper limit of SRy of the release surface of the transfer oriented film of the present invention is preferably 300 nm, more preferably 250 nm, further preferably 150 nm, particularly preferably 120 nm, most preferably 100 nm. is there.
  • the upper limit of the number of protrusions of 0.5 ⁇ m or more on the release surface of the transfer oriented film of the present invention is preferably 5 / m 2 , more preferably 4 / m 2 , and further preferably 3 / m 2.
  • the release surface roughness exceeds the above, the alignment state or phase difference does not become as designed in the minute portion of the liquid crystal compound alignment layer formed on the transfer alignment film of the present invention, and pinholes or scratches are generated. -Like defects may occur. It is considered that this is because, in the case of the alignment layer, the alignment layer on the convex portion is peeled off at the time of rubbing, and rubbing for the foot portion or the concave portion of the convex portion is insufficient. When the release surface layer contains particles, it is considered that the particles fall off during rubbing and damage the surface.
  • a rubbing alignment layer or a photo-alignment layer when wound with the alignment layer provided, by rubbing against the back surface layer, a hole is formed in the alignment layer at the convex portion, and the alignment is caused by pressure. Disturbed, etc. It is considered that due to these defects in the alignment layer, the alignment of the liquid crystal compound does not occur in a minute portion when the alignment layer of the liquid crystal compound is provided on the alignment layer.
  • the following method may be used when the oriented film for transfer of the present invention is a stretched film.
  • the release layer side (surface layer) of the original film does not contain particles.
  • the particles should have a small particle size.
  • a flattening coat is provided.
  • the surface layer preferably contains substantially no particles for smoothing.
  • substantially free of particles is meant that the particle content is less than 50 ppm, preferably less than 30 ppm.
  • the surface layer may contain particles to improve the slipperiness of the surface.
  • the lower limit of the surface layer particle content is preferably 0 ppm, more preferably 50 ppm, and further preferably 100 ppm.
  • the upper limit of the surface layer particle content is preferably 20000 ppm, more preferably 10000 ppm, further preferably 8000 ppm, and particularly preferably 6000 ppm. If it exceeds the above range, the roughness of the surface layer may not be within the preferred range.
  • the lower limit of the surface layer particle size is preferably 0.005 ⁇ m, more preferably 0.01 ⁇ m, and further preferably 0.02 ⁇ m.
  • the upper limit of the surface layer particle size is preferably 3 ⁇ m, more preferably 1 ⁇ m, further preferably 0.5 ⁇ m, and particularly preferably 0.3 ⁇ m. If it exceeds the above range, the roughness of the surface layer may not be within the preferred range.
  • the release surface layer may have a higher roughness due to the effect of the particles in the lower layer. In such a case, it is preferable to increase the thickness of the release surface layer or to provide a lower layer (intermediate layer) containing no particles.
  • the lower limit of the surface layer thickness is preferably 0.1 ⁇ m, more preferably 0.5 ⁇ m, further preferably 1 ⁇ m, particularly preferably 3 ⁇ m, and most preferably 5 ⁇ m.
  • the upper limit of the surface layer thickness is preferably 97%, more preferably 95%, and further preferably 90% based on the total thickness of the oriented film for transfer.
  • the content of particles is less than 50 ppm, preferably less than 30 ppm, in the sense that the intermediate layer containing no particles contains substantially no particles.
  • the lower limit of the thickness of the intermediate layer is preferably 10%, more preferably 20%, and further preferably 30% with respect to the total thickness of the transfer oriented film.
  • the upper limit is preferably 95%, more preferably 90%.
  • a flattening coat may be provided.
  • the resin used for the flattening coat include those generally used as the resin for the coating agent such as polyester, acryl, polyurethane, polystyrene and polyamide. It is also preferable to use a crosslinking agent such as melamine, isocyanate, epoxy resin, or oxazoline compound. These are applied as a coating agent dissolved or dispersed in an organic solvent or water and dried. Alternatively, in the case of acrylic, it may be coated without a solvent and cured by radiation.
  • the planarization coat may be an oligomer block coat. When the release layer is provided as a coat, the release layer itself may be thickened.
  • the lower limit of the thickness of the surface flattening coat layer is preferably 0.01 ⁇ m, more preferably 0.1 ⁇ m, further preferably 0.2 ⁇ m, and particularly preferably 0.3 ⁇ m. If it is less than the above, the flattening effect may be insufficient.
  • the upper limit of the thickness of the surface flattening coat layer is preferably 10 ⁇ m, more preferably 7 ⁇ m, further preferably 5 ⁇ m, and particularly preferably 3 ⁇ m. Even if it exceeds the above range, no further flattening effect may be obtained.
  • the flattening coat may be provided as an in-line coat during the film formation process, or may be provided as a separate offline coat.
  • the transfer alignment film of the present invention may be wound in a roll shape and It was found that this is because the back surface is in contact with the surface, so that the roughness of the back surface is transferred to the front surface (the projections on the back surface are transferred to the release layer to form recesses).
  • the transfer alignment film provided with the liquid crystal compound alignment layer may be wound with a masking film attached to protect the liquid crystal compound alignment layer, but it is often wound as it is for cost reduction.
  • the alignment layer has a phenomenon in which the projections on the back surface cause depressions, holes, and disordered alignment of the alignment layer. Further, it is considered that after the liquid crystal compound alignment layer is provided, a phenomenon that holes are formed in the liquid crystal compound alignment layer and the alignment is disturbed due to the convex portion on the back surface. In particular, the pressure is high at the core portion, and these phenomena are likely to occur. From the above findings, it has been found that the above-mentioned defects can be prevented by making the surface (rear surface) opposite to the release surface have a specific roughness.
  • the lower limit of the three-dimensional arithmetic average roughness (SRa) of the back surface of the transfer oriented film of the present invention is preferably 1 nm, more preferably 2 nm, further preferably 3 nm, particularly preferably 4 nm, and most preferably It is 5 nm.
  • the upper limit of SRa on the back surface of the oriented film for transfer of the present invention is preferably 50 nm, more preferably 45 nm, and further preferably 40 nm. If it exceeds the above, there may be many defects.
  • the lower limit of the three-dimensional ten-point average roughness (SRz) of the back surface of the transfer oriented film of the present invention is preferably 7 nm, more preferably 10 nm, further preferably 15 nm, particularly preferably 20 nm. , And most preferably 25 nm.
  • the upper limit of SRz on the back surface of the oriented film for transfer of the present invention is preferably 1500 nm, more preferably 1200 nm, further preferably 1000 nm, particularly preferably 700 nm, and most preferably 500 nm. If it exceeds the above, there may be many defects.
  • the lower limit of the maximum height (SRy: maximum back surface peak height SRp + back surface maximum depth SRv) of the oriented film for transfer of the present invention is preferably 15 nm, more preferably 20 nm, further preferably 25 nm. Yes, particularly preferably 30 nm, and most preferably 40 nm.
  • the upper limit of the maximum height SRy of the back surface of the transfer oriented film of the present invention is preferably 2000 nm, more preferably 1500 nm, further preferably 1200 nm, particularly preferably 1000 nm, and most preferably 700 nm. Is. If it exceeds the above, there may be many defects.
  • the upper limit of the number of protrusions of 2 ⁇ m or more on the back surface of the transfer oriented film of the present invention is preferably 5 / m 2 , more preferably 4 / m 2 , and further preferably 3 / m 2 . , Particularly preferably 2 / m 2 , and most preferably 1 / m 2 . If it exceeds the above, there may be many defects.
  • the roughness of the back surface of the transfer oriented film of the present invention is less than the above range, the slipperiness of the film is deteriorated, and when the film is conveyed by a roll, it is difficult to slip during winding, and scratches are likely to occur. There is.
  • the roughness of the back surface of the transfer oriented film of the present invention exceeds the above, the above-mentioned defects are likely to occur.
  • the following method may be used when the oriented film for transfer of the present invention is a stretched film.
  • the back side layer (back side layer) of the film raw material contains specific particles.
  • -Use a film-containing intermediate layer containing particles, and reduce the thickness on the back surface side (back surface layer) containing no particles.
  • the roughness of the backside layer (backside layer) of the original film is large, provide a flattening coat.
  • an easy-sliding coat (particle containing coat) is provided.
  • the lower limit of the particle diameter of the back surface layer is preferably 0.01 ⁇ m, more preferably 0.05 ⁇ m, and further preferably 0.1 ⁇ m. If it is less than the above range, slipperiness may be deteriorated and winding failure may occur.
  • the upper limit of the particle diameter of the back surface layer is preferably 5 ⁇ m, more preferably 3 ⁇ m, and further preferably 2 ⁇ m. If it exceeds the above range, the back surface may be too rough.
  • the back surface contains particles, it is preferably 50 ppm, more preferably 100 ppm. If it is less than the above range, the effect of slipperiness due to addition of particles may not be obtained.
  • the upper limit of the content of the back surface layer particles is preferably 10,000 ppm, more preferably 7,000 ppm, and further preferably 5000 ppm. If it exceeds the above range, the back surface may be too rough.
  • the lower limit of the thickness of the back surface layer is preferably 0.1 ⁇ m, more preferably 0.5 ⁇ m, further preferably 1 ⁇ m, particularly preferably 3 ⁇ m, and most preferably 5 ⁇ m.
  • the upper limit of the thickness of the back surface layer is preferably 95%, more preferably 90%, and further preferably 85% with respect to the total thickness of the transfer oriented film.
  • the particle size and amount of particles in the middle layer are the same as those in the back layer.
  • the lower limit of the thickness of the back surface layer is preferably 0.5 ⁇ m, more preferably 1 ⁇ m, and further preferably 2 ⁇ m.
  • the upper limit of the thickness is preferably 30 ⁇ m, more preferably 25 ⁇ m, further preferably 20 ⁇ m.
  • the back side of the original film is rough, it is also preferable to provide a flattening coat.
  • a flattening coat those mentioned for the surface flattening coat can be similarly used.
  • the lower limit of the thickness of the back surface flattening coat layer is preferably 0.01 ⁇ m, more preferably 0.03 ⁇ m, and further preferably 0.05 ⁇ m. If it is less than the above, the flattening effect may be reduced.
  • the upper limit of the thickness of the back surface flattening coat layer is preferably 10 ⁇ m, more preferably 5 ⁇ m, and further preferably 3 ⁇ m. Even if it exceeds the above, the flattening effect will be saturated.
  • the particles on the back side of the original film may not contain particles, and an easy-sliding coat containing particles may be provided on the back surface. Further, when the roughness of the back surface of the original film is small, an easy-sliding coat may be provided.
  • the lower limit of the particle size of the back surface easy-sliding coat layer is preferably 0.01 ⁇ m, more preferably 0.05 ⁇ m. If it is less than the above range, slipperiness may not be obtained.
  • the upper limit of the particle size of the back surface easy-sliding coat layer is preferably 5 ⁇ m, more preferably 3 ⁇ m, further preferably 2 ⁇ m, and particularly preferably 1 ⁇ m. If it exceeds the above range, the back surface roughness may be too high.
  • the lower limit of the particle content of the back surface easy-sliding coat layer is preferably 0.1% by mass, more preferably 0.5% by mass, further preferably 1% by mass, particularly preferably 1.5% by mass. And most preferably 2% by mass. If it is less than the above range, slipperiness may not be obtained.
  • the upper limit of the particle content of the back surface easy-sliding coat layer is preferably 20% by mass, more preferably 15% by mass, and further preferably 10% by mass. If it exceeds the above range, the back surface roughness may be too high.
  • the lower limit of the thickness of the back surface easy-sliding coat layer is preferably 0.01 ⁇ m, more preferably 0.03 ⁇ m, and further preferably 0.05 ⁇ m.
  • the upper limit of the thickness of the back surface easy-sliding coat layer is preferably 10 ⁇ m, more preferably 5 ⁇ m, further preferably 3 ⁇ m, particularly preferably 2 ⁇ m, and most preferably 1 ⁇ m.
  • the lower limit of MD magnification is preferably 1.5 times.
  • the upper limit is preferably 6 times, more preferably 5.5 times, and further preferably 5 times.
  • the lower limit of TD magnification is preferably 1.5 times.
  • the upper limit of the TD magnification is preferably 6 times, more preferably 5.5 times, and further preferably 5 times.
  • the lower limit of the HS temperature is preferably 150 ° C, more preferably 170 ° C. If it is less than the above, the heat shrinkage ratio may not decrease.
  • the upper limit of the HS temperature is preferably 240 ° C, more preferably 230 ° C. If it exceeds the above range, the resin may deteriorate.
  • the lower limit of the TD relaxation rate is preferably 0.1%, more preferably 0.5%. If it is less than the above, the heat shrinkage ratio may not decrease.
  • the upper limit of the TD relaxation rate is preferably 8%, more preferably 6%, further preferably 5%. If it exceeds the above range, the flatness may be deteriorated due to the slack, and the thickness may become uneven.
  • annealing it is preferable to unwind the film and pass it through an oven to wind it.
  • the lower limit of the annealing temperature is preferably 80 ° C, more preferably 90 ° C, and further preferably 100 ° C. If it is less than the above, the annealing effect may not be obtained in some cases.
  • the upper limit of the annealing temperature is preferably 200 ° C, more preferably 180 ° C, and further preferably 160 ° C. If it exceeds the above range, the flatness may be deteriorated or the heat shrinkage may be increased.
  • the lower limit of the annealing time is preferably 5 seconds, more preferably 10 seconds, and further preferably 15 seconds. If it is less than the above, the annealing effect may not be obtained in some cases.
  • the upper limit of the annealing time is preferably 10 minutes, more preferably 5 minutes, further preferably 3 minutes, and particularly preferably 1 minute. If it exceeds the above range, not only the effect is saturated, but also a large oven is required, and the productivity may be deteriorated.
  • the relaxation rate is adjusted by the peripheral speed difference between the unwinding speed and the winding speed, and the relaxation rate is adjusted by adjusting the winding tension.
  • the lower limit of the relaxation rate is preferably 0.5%. If it is less than the above, the annealing effect may not be obtained in some cases.
  • the upper limit of the relaxation rate is preferably 8%, more preferably 6%, further preferably 5%. If it exceeds the above range, the flatness may be deteriorated or winding failure may occur.
  • the liquid crystal compound alignment layer transfer laminate of the present invention has a structure in which the liquid crystal compound alignment layer and the transfer alignment film of the present invention are laminated.
  • the liquid crystal compound alignment layer must be applied and aligned on the transfer alignment film.
  • a method for orienting a method for giving an orientation control function by rubbing a lower layer (release surface) of the liquid crystal compound orientation layer, or irradiating polarized ultraviolet rays after coating the liquid crystal compound to orient the liquid crystal compound directly There is a way.
  • the alignment layer and the liquid crystal compound alignment layer may be collectively referred to as a liquid crystal compound alignment layer, instead of the liquid crystal compound alignment layer alone.
  • the orientation control layer any orientation control layer may be used as long as it can bring the liquid crystal compound orientation layer into a desired orientation state, but a rubbing treatment orientation control layer obtained by rubbing a resin coating film or A preferable example is a photo-alignment control layer that orients molecules by polarized light irradiation to produce an alignment function.
  • a rubbing treatment orientation control layer coating liquid containing the above-mentioned polymer material is applied on the release surface of the orientation film and then dried by heating to obtain an orientation control layer before the rubbing treatment.
  • the orientation control layer coating liquid may contain a crosslinking agent.
  • any solvent that dissolves the polymer material can be used without limitation.
  • Specific examples thereof include alcohols such as water, methanol, ethanol, ethylene glycol, isopropyl alcohol, propylene glycol and cellosolve; ester solvents such as ethyl acetate, butyl acetate and gamma-butyrolactone; acetone, methyl ethyl ketone, cyclopentanone, cyclohexanone. , And the like; ketone-based solvents such as; and aromatic hydrocarbon solvents such as toluene and xylene; and ether-based solvents such as tetrahydrofuran and dimethoxyethane. These solvents may be used alone or in combination.
  • the concentration of the coating solution for rubbing alignment control layer can be appropriately adjusted depending on the type of polymer and the thickness of the alignment control layer to be produced, but it is preferably 0.2 to 20% by mass in terms of solid content concentration. The range of 0.3 to 10% by mass is particularly preferable.
  • a coating method known methods such as a gravure coating method, a die coating method, a bar coating method and an applicator method, and a printing method such as a flexo method are used.
  • the heating and drying temperature is preferably in the range of 30 to 170 ° C. in the case of PET, more preferably 50 to 150 ° C., and further preferably 70 to 130 ° C., although it depends on the oriented film for transfer.
  • the heating and drying time may be, for example, 0.5 to 30 minutes, more preferably 1 to 20 minutes, and further preferably 2 to 10 minutes.
  • the thickness of the rubbing orientation control layer is preferably 0.01 to 10 ⁇ m, more preferably 0.05 to 5 ⁇ m, and particularly preferably 0.1 ⁇ m to 1 ⁇ m.
  • the rubbing treatment can be generally performed by rubbing the surface of the polymer layer with paper or cloth in a certain direction.
  • the surface of the orientation control layer is rubbed by using a rubbing roller made of a raised cloth of fibers such as nylon, polyester, and acrylic.
  • the rubbing direction of the alignment control layer also needs to be at an angle suitable for it. The angle can be adjusted by adjusting the angle between the rubbing roller and the oriented film, and adjusting the conveying speed of the oriented film and the rotation speed of the roller.
  • the photo-alignment control layer is an alignment film in which a coating liquid containing a polymer or monomer having a photoreactive group and a solvent is applied to the alignment film, and the alignment control force is imparted by irradiating polarized light, preferably polarized ultraviolet light.
  • the photoreactive group refers to a group that produces a liquid crystal aligning ability when irradiated with light. Specifically, it is one that causes a photoreaction that is the origin of the liquid crystal alignment ability, such as an orientation induction or isomerization reaction, a dimerization reaction, a photocrosslinking reaction, or a photodecomposition reaction of a molecule generated by irradiation with light. is there.
  • the photoreactive groups those that cause a dimerization reaction or a photocrosslinking reaction are preferable because they have excellent alignment properties and maintain the smectic liquid crystal state of the liquid crystal compound alignment layer.
  • a group having at least one selected from the above is particularly preferable.
  • a photoreactive group capable of causing a photodimerization reaction is preferable
  • a cinnamoyl group and a chalcone group have a relatively small amount of polarized light irradiation necessary for photoalignment, and a photoalignment layer having excellent thermal stability and stability over time. It is preferable because it is easily obtained.
  • a polymer having a photoreactive group a polymer having a cinnamoyl group such that the end portion of the polymer side chain has a cinnamic acid structure is particularly preferable.
  • the main chain structure include polyimide, polyamide, (meth) acrylic, polyester, and the like.
  • Specific alignment control layers include, for example, JP-A 2006-285197, JP-A 2007-76839, JP-A 2007-138138, JP-A 2007-94071, and JP-A 2007-121721. , JP-A-2007-140465, JP-A-2007-156439, JP-A-2007-133184, JP-A-2009-109831, JP-A-2002-229039, JP-A-2002-265541, and Alignment described in Japanese Unexamined Patent Publication No. 2002-317013, Special Table 2003-520878, Special Table 2004-529220, JP2013-33248, JP2015-7702, and JP2015-129210. A control layer is included.
  • the solvent for the photo-alignment control layer forming coating liquid can be used without limitation as long as it dissolves the polymer and monomer having a photoreactive group. Specific examples include those mentioned in the method of forming the rubbing orientation control layer. It is also preferable to add a photopolymerization initiator, a polymerization inhibitor, and various stabilizers to the coating liquid for forming the photo-alignment control layer. Further, a polymer other than the polymer having the photoreactive group and the monomer, or a monomer having no photoreactive group which is copolymerizable with the monomer having the photoreactive group may be added.
  • the concentration, coating method, and drying conditions of the coating liquid for forming the photo-alignment control layer can be the same as those mentioned in the method for forming the rubbing-alignment control layer.
  • the thickness is the same as the preferable thickness of the rubbing treatment orientation control layer.
  • the transfer orientation film may be passed through for irradiation.
  • the wavelength of polarized light is preferably in the wavelength range where the photoreactive group of the polymer or monomer having a photoreactive group can absorb light energy.
  • ultraviolet rays having a wavelength of 250 to 400 nm are preferable.
  • Examples of polarized light sources include xenon lamps, high-pressure mercury lamps, ultra-high pressure mercury lamps, metal halide lamps, and ultraviolet light lasers such as KrF and ArF. High-pressure mercury lamps, ultra-high-pressure mercury lamps and metal halide lamps are preferable. .
  • Polarized light is obtained, for example, by passing light from the light source through a polarizer.
  • the polarization direction can be adjusted by adjusting the polarization angle of the polarizer.
  • the polarizer include a polarizing filter, a polarizing prism such as Glan-Thompson and Glan-Teller, and a wire grid type polarizer.
  • the polarized light is preferably substantially collimated light.
  • the direction of the alignment control force of the photo-alignment control layer can be adjusted arbitrarily.
  • the irradiation intensity is different in kind and amount of a polymerization initiator or a resin (monomer), for example, preferably 10 ⁇ 10000mJ / cm 2 at 365nm reference, and more preferably 20 ⁇ 5000mJ / cm 2.
  • the liquid crystal compound alignment layer is not particularly limited as long as the liquid crystal compound is aligned. Specific examples include a polarizing film (polarizer) containing a liquid crystal compound and a dichroic dye, and a retardation layer containing a rod-shaped or discotic liquid crystal compound.
  • polarizer polarizing film
  • retardation layer containing a rod-shaped or discotic liquid crystal compound.
  • the polarizing film has a function of passing polarized light in only one direction and contains a dichroic dye.
  • the dichroic dye is a dye having a property that the absorbance in the long axis direction of the molecule and the absorbance in the short axis direction of the molecule are different.
  • the dichroic dye preferably has an absorption maximum wavelength ( ⁇ MAX) in the range of 300 to 700 nm.
  • a dichroic dye examples include an acridine dye, an oxazine dye, a cyanine dye, a naphthalene dye, an azo dye and an anthraquinone dye, and among them, an azo dye is preferable.
  • the azo dye examples include a monoazo dye, a bisazo dye, a trisazo dye, a tetrakisazo dye and a stilbeneazo dye, and a bisazo dye and a trisazo dye are preferable.
  • the dichroic dyes may be used alone or in combination, but it is preferable to combine two or more kinds in order to adjust the color tone (achromatic color). Particularly, it is preferable to combine three or more kinds. In particular, it is preferable to combine three or more kinds of azo compounds.
  • Preferred azo compounds include dyes described in JP-A 2007-126628, 2010-168570, 2013-101328, and 2013-210624.
  • the dichroic dye is a dichroic dye polymer introduced into the side chain of a polymer such as acrylic.
  • dichroic dye polymers include polymers described in JP-A-2016-4055 and polymers obtained by polymerizing the compounds of [Chemical formula 6] to [Chemical formula 12] in JP-A-2014-206682.
  • the content of the dichroic dye in the polarizing film is preferably 0.1 to 30% by mass, more preferably 0.5 to 20% by mass, from the viewpoint of improving the orientation of the dichroic dye. , 1.0 to 15 mass% is more preferable, and 2.0 to 10 mass% is particularly preferable.
  • the polarizing film preferably further contains a polymerizable liquid crystal compound in order to improve film strength, polarization degree and film homogeneity.
  • the polymerizable liquid crystal compound also includes a substance after polymerization as a film.
  • the polymerizable liquid crystal compound is a compound having a polymerizable group and exhibiting liquid crystallinity.
  • the polymerizable group means a group that participates in the polymerization reaction, and is preferably a photopolymerizable group.
  • the photopolymerizable group refers to a group capable of undergoing a polymerization reaction with an active radical or an acid generated from a photopolymerization initiator described later.
  • Examples of the polymerizable group include vinyl group, vinyloxy group, 1-chlorovinyl group, isopropenyl group, 4-vinylphenyl group, acryloyloxy group, methacryloyloxy group, oxiranyl group and oxetanyl group. Among them, an acryloyloxy group, a methacryloyloxy group, a vinyloxy group, an oxiranyl group and an oxetanyl group are preferable, and an acryloyloxy group is more preferable.
  • the compound exhibiting liquid crystallinity may be a thermotropic liquid crystal or a lyotropic liquid crystal, and may be a nematic liquid crystal or a smectic liquid crystal in the thermotropic liquid crystal.
  • the polymerizable liquid crystal compound is preferably a smectic liquid crystal compound, and more preferably a high-order smectic liquid crystal compound, in that higher polarization characteristics can be obtained.
  • the liquid crystal phase formed by the polymerizable liquid crystal compound is a higher order smectic phase, a polarizing film having a higher degree of orientational order can be manufactured.
  • Specific preferred polymerizable liquid crystal compounds include, for example, JP-A-2002-308832, JP-A-2007-16207, JP-A-2015-163596, JP-A-2007-510946, and JP-A-2013-114131.
  • Publication, WO 2005/045485, Lub et al. Recl. Trav. Chim. Examples include those described in Pays-Bas, 115, 321-328 (1996) and the like.
  • the content ratio of the polymerizable liquid crystal compound in the polarizing film is preferably 70 to 99.5% by mass, more preferably 75 to 99% by mass, further from the viewpoint of increasing the orientation of the polymerizable liquid crystal compound. It is preferably 80 to 97% by mass, and particularly preferably 83 to 95% by mass.
  • the polarizing film can be provided by applying a coating composition for the polarizing film.
  • the polarizing film composition coating material may contain a solvent, a polymerization initiator, a sensitizer, a polymerization inhibitor, a leveling agent, a polymerizable non-liquid crystal compound, a crosslinking agent and the like.
  • solvent those mentioned as the solvent for the alignment layer coating solution are preferably used.
  • the polymerization initiator is not limited as long as it polymerizes the polymerizable liquid crystal compound, but a photopolymerization initiator that generates an active radical by light is preferable.
  • the polymerization initiator include benzoin compounds, benzophenone compounds, alkylphenone compounds, acylphosphine oxide compounds, triazine compounds, iodonium salts and sulfonium salts.
  • the photosensitizer is preferable as the sensitizer.
  • a xanthone compound, an anthracene compound, phenothiazine, rubrene, etc. are mentioned.
  • polymerization inhibitors examples include hydroquinones, catechols, and thiophenols.
  • the polymerizable non-liquid crystal compound those which are copolymerizable with the polymerizable liquid crystal compound are preferable, and for example, when the polymerizable liquid crystal compound has a (meth) acryloyloxy group, (meth) crates can be mentioned.
  • the (meth) acrylates may be monofunctional or polyfunctional. By using polyfunctional (meth) acrylates, the strength of the polarizing film can be improved.
  • a polymerizable non-liquid crystal compound it is preferably contained in the polarizing film in an amount of 1 to 15% by mass, more preferably 2 to 10% by mass, and particularly preferably 3 to 7% by mass. If it exceeds 15% by mass, the degree of polarization may decrease.
  • cross-linking agent examples include compounds capable of reacting with a functional group of a polymerizable liquid crystal compound and a polymerizable non-liquid crystal compound, such as an isocyanate compound, melamine, an epoxy resin and an oxazoline compound.
  • the polarizing film is provided by directly applying the polarizing film composition coating material on the transfer orientation film or the orientation control layer, and then drying, heating, and curing if necessary.
  • the coating method known methods such as a gravure coating method, a die coating method, a bar coating method and an applicator method, and a printing method such as a flexo method are used as the coating method.
  • the coated transfer oriented film is introduced into a hot air dryer, an infrared dryer or the like and dried at 30 to 170 ° C., more preferably 50 to 150 ° C., further preferably 70 to 130 ° C.
  • the drying time is preferably 0.5 to 30 minutes, more preferably 1 to 20 minutes, and even more preferably 2 to 10 minutes.
  • Heating can be performed to more strongly align the dichroic dye and the polymerizable liquid crystal compound in the polarizing film.
  • the heating temperature is preferably in the temperature range in which the polymerizable liquid crystal compound forms a liquid crystal phase.
  • the coating composition for the polarizing film contains a polymerizable liquid crystal compound
  • it is preferably cured.
  • the curing method include heating and light irradiation, and light irradiation is preferable.
  • the dichroic dye can be fixed in the oriented state.
  • the curing is preferably performed in a state where a liquid crystal phase is formed in the polymerizable liquid crystal compound, and may be cured by irradiation with light at a temperature showing the liquid crystal phase.
  • the light in the light irradiation include visible light, ultraviolet light and laser light. From the viewpoint of easy handling, ultraviolet light is preferable.
  • the irradiation intensity is different in kind and amount of a polymerization initiator or a resin (monomer), for example, preferably 100 ⁇ 10000mJ / cm 2 at 365nm reference, more preferably 200 ⁇ 5000mJ / cm 2.
  • Polarizing film by applying a polarizing film composition paint on the orientation control layer, the dye is oriented along the orientation direction of the orientation layer, as a result, it will have a polarization transmission axis of a predetermined direction,
  • the polarization film can be aligned by irradiating polarized light to cure the composition for forming the polarization film.
  • polarized light in a desired direction for example, polarized light in an oblique direction
  • the dichroic dye is strongly aligned along the alignment direction of the polymer liquid crystal by further heat treatment thereafter.
  • the thickness of the polarizing film is 0.1 to 5 ⁇ m, preferably 0.3 to 3 ⁇ m, more preferably 0.5 to 2 ⁇ m.
  • retardation layer Representative examples of the retardation layer include a layer provided for optical compensation between a polarizer of a liquid crystal display device and a liquid crystal cell, and a ⁇ / 4 layer and a ⁇ / 2 layer of a circularly polarizing plate.
  • a polarizer of a liquid crystal display device and a liquid crystal cell
  • a ⁇ / 4 layer and a ⁇ / 2 layer of a circularly polarizing plate As the liquid crystal compound, a raw or negative A plate, a positive or negative C plate, an O plate, or the like, and a rod-shaped liquid crystal compound, a discotic liquid crystal compound, or the like can be used depending on the purpose.
  • the degree of retardation is appropriately set depending on the type of liquid crystal cell and the properties of the liquid crystal compound used in the cell when used for optical compensation of a liquid crystal display device.
  • an O plate using discotic liquid crystal is preferably used.
  • a C plate or A plate using a rod-shaped liquid crystal compound or a discotic liquid crystal compound is preferably used.
  • a rod-shaped compound it is preferable to use a rod-shaped compound to form an A plate.
  • the liquid crystal compound used for these retardation layers is preferably a polymerizable liquid crystal compound having a polymerizable group such as a double bond from the viewpoint that the alignment state can be fixed.
  • rod-shaped liquid crystal compounds examples include JP-A-2002-030042, JP-A-2004-204190, JP-A-2005-263789, JP-A-2007-119415, JP-A-2007-186430, and Examples thereof include rod-like liquid crystal compounds having a polymerizable group described in Kaihei 11-513360.
  • rod-shaped liquid crystal compounds may be used in combination at an arbitrary ratio.
  • discotic liquid crystal compound examples include benzene derivatives, truxene derivatives, cyclohexane derivatives, azacrown-based and phenylacetylene-based macrocycles, and various compounds are described in JP-A-2001-155866. Is preferably used. Among them, a compound having a triphenylene ring represented by the following general formula (1) is preferably used as the discotic compound.
  • R 1 to R 6 are each independently hydrogen, halogen, an alkyl group, or a group represented by —O—X (where X is an alkyl group, an acyl group, an alkoxybenzyl group, an epoxy-modified group).
  • R 1 to R 6 are preferably an acryloyloxy-modified alkoxybenzyl group represented by the following general formula (2) (where m is 4 to 10).
  • the retardation layer can be provided by applying the composition coating for the retardation layer.
  • the retardation layer composition coating material may contain a solvent, a polymerization initiator, a sensitizer, a polymerization inhibitor, a leveling agent, a polymerizable non-liquid crystal compound, a crosslinking agent and the like. As these, those described in the alignment control layer and the liquid crystal polarizer can be used.
  • the retardation layer is provided by applying the composition coating for the retardation layer on the release surface of the orientation film or the orientation control layer, followed by drying, heating and curing.
  • the conditions explained in the orientation control layer and the liquid crystal polarizer are used as preferable conditions.
  • a plurality of retardation layers may be provided.
  • a plurality of retardation layers may be provided on one transfer alignment film and transferred to an object, and the transfer layer may be transferred onto one transfer alignment film. It is also possible to prepare a plurality of types provided with a single retardation layer and transfer these in order to the object.
  • the polarizing layer and the retardation layer may be provided on a single transfer orientation film and transferred to an object.
  • a protective layer may be provided between the polarizer and the retardation layer, or a protective layer may be provided on the retardation layer or between the retardation layers. These protective layers may be provided on the transfer orientation film together with the retardation layer and the polarizing layer and transferred to the object.
  • a transparent resin coating layer may be used as the protective layer.
  • the transparent resin is not particularly limited, such as polyvinyl alcohol, ethylene vinyl alcohol copolymer, polyester, polyurethane, polyamide, polystyrene, acrylic resin and epoxy resin.
  • a cross-linking structure may be formed by adding a cross-linking agent to these resins. Further, it may be one obtained by curing a photocurable composition such as acrylic as a hard coat. Further, after the protective layer is provided on the alignment film, the protective layer may be rubbed, and the liquid crystal compound alignment layer may be provided thereon without providing the alignment layer.
  • the method for producing a liquid crystal compound alignment layer laminated polarizing plate of the present invention includes a step of laminating a liquid crystal compound alignment layer surface of the liquid crystal compound alignment layer transfer laminate of the present invention to form an intermediate laminate, and an intermediate laminate. The step of peeling the oriented film from the body is included.
  • the liquid crystal compound alignment layer is the liquid crystal compound alignment layer used for the circularly polarizing plate.
  • a ⁇ / 4 layer is used as the retardation layer (referred to as a liquid crystal compound alignment layer in the transfer laminate).
  • the front retardation of the ⁇ / 4 layer is preferably 100 to 180 nm. More preferably, it is 120 to 150 nm.
  • the orientation axis (slow axis) of the ⁇ / 4 layer and the transmission axis of the polarizer are preferably 35 to 55 degrees, more preferably 40 degrees to 50 degrees, and further preferably Is 42 to 48 degrees.
  • the absorption axis of the polarizer is in the length direction of the long polarizer film, and therefore the long alignment film for transfer has a ⁇ .
  • the liquid crystal compound is oriented so as to have the above relationship by taking the angle of the transmission axis of the polarizer into consideration.
  • the polarizing plate may have a protective film provided on both sides of the polarizer, but preferably has a protective film provided on only one side. In the case of a polarizing plate in which a protective film is provided only on one surface, it is preferable to attach a retardation layer to the opposite surface (polarizer surface) of the protective film.
  • the retardation layer is attached to the side that is supposed to be on the image cell side.
  • the surface that is assumed to be on the image cell side is a surface that is not generally surface-treated such as a low reflection layer, an antireflection layer, and an antiglare layer, which is provided on the viewing side.
  • the protective film on the side to which the retardation layer is attached is preferably a protective film such as TAC, acrylic, or COP having no retardation.
  • polarizer a PVA-based film alone is stretched to form a polarizer, or an unstretched substrate such as polyester or polypropylene is coated with PVA, and the polarizer is stretched to protect the polarizer.
  • examples thereof include those transferred to a film and those obtained by coating or transferring a polarizer comprising a liquid crystal compound and a dichroic dye on a polarizer protective film, and any of them is preferably used.
  • a conventionally known one such as an adhesive or an adhesive can be used.
  • an adhesive a polyvinyl alcohol adhesive, an ultraviolet curable adhesive such as acrylic or epoxy, or a thermosetting adhesive such as epoxy or isocyanate (urethane) is preferably used.
  • the adhesive include acrylic, urethane-based and rubber-based adhesives. It is also preferable to use an optical transparent pressure-sensitive adhesive sheet without an acrylic base material.
  • the polarizer When a transfer type is used as the polarizer, the polarizer is transferred onto the retardation layer (liquid crystal compound alignment layer) of the transfer laminate, and then the polarizer and the retardation layer are targeted (polarizer protective film). It may be transferred to.
  • the retardation layer liquid crystal compound alignment layer
  • the polarizer protective film on the side opposite to the side where the retardation layer is provided commonly known ones such as TAC, acrylic, COP, polycarbonate, polyester can be used. Among them, TAC, acrylic, COP and polyester are preferable.
  • the polyester is preferably polyethylene terephthalate. In the case of polyester, a zero retardation film having an in-plane retardation of 100 nm or less, particularly 50 nm or less, or a high retardation film of 3000 nm to 30,000 nm is preferable.
  • the angle between the transmission axis of the polarizer and the slow axis of the high retardation film is in the range of 30 to 60 degrees for the purpose of preventing blackout and coloring when viewing the image with polarized sunglasses. Is preferable, and the range of 35 to 55 degrees is more preferable.
  • the angle between the transmission axis of the polarizer and the slow axis of the high retardation film be 10 degrees or less, and even 7 degrees or less? Alternatively, it is preferably 80 to 100 degrees, and more preferably 83 to 97 degrees.
  • the polarizer protective film on the opposite side may be provided with an antiglare layer, an antireflection layer, a low reflection layer, a hard coat layer and the like.
  • the ⁇ / 4 layer may be used in combination with the ⁇ / 2 layer.
  • the front retardation of the ⁇ / 2 layer is preferably 200 to 360 nm. More preferably, it is 240 to 300 nm.
  • the angle ( ⁇ ) between the orientation axis (slow axis) of the ⁇ / 2 layer and the transmission axis of the polarizer is preferably 5 to 20 degrees, more preferably 7 to 17 degrees.
  • the angle between the orientation axis (slow axis) of the ⁇ / 2 layer and the orientation axis of ⁇ / 4 (slow axis) is preferably 2 ⁇ + 45 ° ⁇ 10 °, more preferably 2 ⁇ + 45 ° ⁇ 5 °. Yes, and more preferably within the range of 2 ⁇ + 45 ° ⁇ 3 °.
  • the absorption axis of the polarizer is in the length direction of the long polarizer film, and therefore, for long-length transfer.
  • a ⁇ / 2 layer or a ⁇ / 4 layer is provided on the oriented film, it is preferable to orient the liquid crystal compound so as to be in the above range with respect to the lengthwise direction or the lengthwise vertical direction of the long transfer oriented film. .
  • the liquid crystal compound is oriented so as to have the above relationship by taking the angle of the transmission axis of the polarizer into consideration.
  • a C plate layer on the ⁇ / 4 layer in order to reduce the change in coloring when viewed from an angle.
  • a positive or negative C plate layer is used according to the characteristics of the ⁇ / 4 layer and the ⁇ / 2 layer.
  • a ⁇ / 2 layer is provided on the polarizer by transfer, and a ⁇ / 4 layer is further provided on it by transfer.
  • a ⁇ / 4 layer and a ⁇ / 2 layer are provided in this order on the transfer orientation film, and this is transferred onto the polarizer.
  • a ⁇ / 4 layer, a ⁇ / 2 layer and a polarizing layer are provided in this order on the transfer orientation film, and this is transferred to an object.
  • a ⁇ / 2 layer and a polarizing layer are provided in this order on the transfer orientation film, and this is transferred to an object, and then the ⁇ / 4 layer is transferred onto this.
  • Various methods such as can be adopted.
  • a method of transferring the C plate layer onto the ⁇ / 4 layer provided on the polarizer, or providing the C plate layer on the oriented film, and further forming the ⁇ / 4 layer thereon Various methods such as a method of providing a ⁇ / 2 layer and a ⁇ / 4 layer and transferring the layer can be adopted.
  • the thickness of the circularly polarizing plate thus obtained is preferably 120 ⁇ m or less. It is more preferably 100 ⁇ m or less, still more preferably 90 ⁇ m or less, particularly preferably 80 ⁇ m or less, and most preferably 70 ⁇ m or less.
  • the method for inspecting a laminate for transferring a liquid crystal compound alignment layer according to the present invention is parallel to the alignment direction of the alignment film, the direction orthogonal to the alignment direction, the flow direction of the alignment film, or the direction orthogonal to the flow direction.
  • the method includes the steps of irradiating linearly polarized light having an electric field vibration direction from the alignment film surface of the laminate and receiving light on the liquid crystal compound alignment layer surface side, and inspecting whether the received light is in the extinction state.
  • the optical properties of the liquid crystal compound alignment layer transfer laminate can be inspected in a state where the liquid crystal compound alignment layer is a retardation layer and is laminated on the transfer alignment film.
  • a linearly polarized light that is parallel or perpendicular to the alignment direction of the transfer alignment film is irradiated, and the change in the polarization state is detected by the light receiver installed on the opposite surface of the laminate.
  • the direction parallel to the orientation direction of the transfer orientation film is preferably ⁇ 10 to +10 degrees, more preferably ⁇ 7 to 7 degrees, further preferably ⁇ 5 to 5 degrees, particularly preferably ⁇ 3 to 3 degrees, most preferably Is -2 to 2 degrees.
  • the direction perpendicular to the orientation direction of the transfer orientation film is preferably 80 to 100 degrees, more preferably 83 to 97 degrees, further preferably 85 to 95 degrees, particularly preferably 87 to 93 degrees, and most preferably 88 to 92. It is degree. If the amount exceeds the above range, the polarized light that strikes the retardation layer or the polarized light that has passed therethrough may be disturbed by the retardation of the base material, and accurate evaluation may not be possible.
  • the angle of the linearly polarized light to be irradiated may be adjusted each time according to the orientation direction of the transfer orientation film, but the inspection becomes complicated. Therefore, it is also preferable to fix the linearly polarized light to be irradiated as parallel or perpendicular to the flow direction of the transfer orientation film and inspect it.
  • the parallel or vertical range is the same as above.
  • a polarizing filter between the light receiver and the liquid crystal alignment layer (retardation layer) transfer laminate (film to be inspected).
  • the liquid crystal compound alignment layer (retardation layer) transfer laminate and the polarizing filter the light that has been elliptically polarized by the phase difference layer of the liquid crystal compound alignment layer (retardation layer) transfer laminate is designed.
  • a retardation plate for converting it into linearly polarized light.
  • the polarizing layer can be inspected by irradiating natural light (non-polarized light) and receiving transmitted light through a polarizing filter. Further, the inspection can be performed by irradiating the transfer laminate with the linearly polarized light through the polarizing filter and receiving the transmitted light. In these cases, the polarizing filter is set to an angle that extinguishes when the polarizing layer provided on the transfer orientation film is designed.
  • orientation direction was determined at five points (5 cm inward from each end), the central part, and the intermediate part between the central part and both ends. An intermediate portion between the central portion and both end portions is at a position where the distance between the central portion and both end portions is divided into two equal parts.
  • the orientation direction was the slow axis direction of the film obtained by using a molecular orientation meter (MOA-6004 type molecular orientation meter manufactured by Oji Scientific Instruments Co., Ltd.). Next, it was examined whether the orientation direction of the entire film was close to the machine direction (MD) or the width direction (TD).
  • the difference between the maximum value and the minimum value among the angles obtained at the above-mentioned 5 places was defined as "the angular difference in the orientation angle in the width direction of the film".
  • the angle is a positive value when the orientation direction is on the same side as the maximum value with respect to the longitudinal direction or the width direction, and a negative value when the orientation direction is on the opposite side to the longitudinal direction or the width direction.
  • the minimum value is evaluated by distinguishing between positive and negative.
  • a lower polarizing plate is placed on a surface emitting light source using a white LED using a yellow phosphor as a light source, and a retardation layer (liquid crystal compound orientation layer) is placed on the orientation film for transfer.
  • the provided sample laminated body was placed so that the extinction axis direction (absorption axis direction) of the polarizing plate was parallel to the long side direction of the sample laminated body.
  • a ⁇ / 4 film made of a stretched film of a cyclic polyolefin is placed thereon so that the orientation main axis is in the direction of 45 degrees with the extinction axis of the lower polarizing plate, and the upper polarizing plate is placed on the upper polarizing plate.
  • the extinction axis of was placed parallel to the extinction axis of the lower polarizing plate. In this state, the extinction state was observed. Specifically, the extinction state of the brightest part of the sample laminate was evaluated according to the following criteria. In addition, excluding the sample laminate and the ⁇ / 4 film, the extinction state was the extinction state in which the lower polarizing plate and the upper polarizing plate were in a crossed Nicol state. ⁇ : There was no part that felt bright, and the whole was in the extinguished state. ⁇ : A slight amount of transmitted light was recognized as compared with the extinction state. ⁇ : Although transmitted light was observed, it was possible to evaluate the phase difference state. X: A large amount of transmitted light, and it was difficult to evaluate the phase difference state.
  • the uniformity of the extinction state in the sample laminate was evaluated according to the following criteria.
  • the extinction state was the extinction state in which the lower polarizing plate and the upper polarizing plate were in a crossed Nicol state.
  • ⁇ The brightness was almost the same in the entire sample laminate.
  • ⁇ There was a slight difference in brightness.
  • ⁇ There was a small difference in brightness.
  • X The difference in brightness was large.
  • the angle difference between the extinction direction and the long side direction of the orientation film is obtained, the difference between this angle difference and 45 degrees is taken as the heating orientation direction deviation, and the average value of 5 times is calculated and evaluated according to the following criteria. did. A: Within 1 degree. ⁇ : More than 1 degree and less than 2 degrees. ⁇ : More than 2 degrees and 3 degrees or less. X: Exceeded 3 degrees.
  • the obtained filtrate was concentrated to dryness with a rotary evaporator. 10 ml of dimethylformamide was added to the concentrated dry solid to give an ester cyclic trimer measurement solution, and the content of the ester cyclic trimer was determined by liquid chromatography.
  • the film with the protective film attached is set in an oven heated to 150 ° C., and after 90 minutes have elapsed, the film is taken out. After that, the protective film is peeled off, the haze of the film is measured by the same method as described above, and the haze is obtained after heating. The difference in haze before and after heating is defined as ⁇ haze.
  • ⁇ haze (%) (haze after heating)-(haze before heating)
  • the same operation as above was continuously performed 150 times at intervals of 2 ⁇ m in the width direction of the film, that is, over 0.3 mm in the width direction of the film, and the data was captured by the analyzer.
  • the center plane average roughness (SRa), the ten-point average roughness (SRz), and the maximum height (SRy) were obtained using an analyzer.
  • the portion thus detected is cut into an appropriate size from the test piece, and a three-dimensional shape measuring device (Micromap TYPE550, manufactured by Ryoka Systems Inc .; measurement conditions: wavelength 550 nm, WAVE mode, objective lens 10 times) is used. It was used and observed from the direction perpendicular to the film surface and measured. At this time, the irregularities that are close to each other within 50 ⁇ m when observed from the direction perpendicular to the film surface are assumed to be the same scratch and a rectangle covering them as foreign matter, and the length and width of this rectangle are scratched, and the length of the foreign matter is long. And width.
  • a three-dimensional shape measuring device Micromap TYPE550, manufactured by Ryoka Systems Inc .; measurement conditions: wavelength 550 nm, WAVE mode, objective lens 10 times
  • the number of defects was quantified using a cross-sectional image (SURFACE PROFILE DISPLAY). The measurement was performed on 20 test pieces and converted into the number of defects per 1 m 2 . The number of defects having a height difference (difference between the highest point and the lowest point) of 0.5 ⁇ m or more on the release surface and the number of defects having a height difference of 2.0 ⁇ m or more on the back surface were counted.
  • the pressure and temperature were raised, and the pressure esterification reaction was carried out under the conditions of a gauge pressure of 0.34 MPa and 240 ° C., the esterification reaction vessel was returned to normal pressure, and 0.014 parts by mass of phosphoric acid was added. . Furthermore, the temperature was raised to 260 ° C. over 15 minutes, and 0.012 parts by mass of trimethyl phosphate was added. Then, 15 minutes later, a dispersion treatment was performed with a high-pressure disperser, and after 15 minutes, the obtained esterification reaction product was transferred to a polycondensation reaction can and subjected to polycondensation reaction under reduced pressure at 280 ° C.
  • PET (Xm) polyethylene terephthalate resin
  • the intrinsic viscosity of PET (X-m) was 0.62 dl / g, and substantially no inert particles or internally precipitated particles were contained.
  • polyester resin 10 parts by mass of the dried UV absorber (2,2 ′-(1,4-phenylene) bis (4H-3,1-benzoxazinone-4-one) and PET (Xm) (having an intrinsic viscosity of 0.62 dl / g) 90 parts by mass were mixed, and a kneading extruder was used to obtain a polyethylene terephthalate resin (PET (Y)) containing an ultraviolet absorber.
  • PET (Y) 10 parts by mass of the dried UV absorber (2,2 ′-(1,4-phenylene) bis (4H-3,1-benzoxazinone-4-one) and PET (Xm) (having an intrinsic viscosity of 0.62 dl / g) 90 parts by mass were mixed, and a kneading extruder was used to obtain a polyethylene terephthalate resin (PET (Y)) containing an ultraviolet absorber.
  • a polyurethane resin D-1 containing an aliphatic polycarbonate polyol as a constituent component was produced by the following procedure. In a four-necked flask equipped with a stirrer, a Dimroth condenser, a nitrogen introduction tube, a silica gel drying tube, and a thermometer, 43.75 parts by mass of 4,4-diphenylmethane diisocyanate, 12.85 parts by mass of dimethylolbutanoic acid, and a number 153.41 parts by mass of polyhexamethylene carbonate diol having an average molecular weight of 2000, 0.03 parts by mass of dibutyltin dilaurate, and 84.00 parts by mass of acetone as a solvent were added, and the mixture was stirred at 75 ° C.
  • reaction liquid was cooled to 40 ° C., and then 8.77 parts by mass of triethylamine was added to obtain a polyurethane prepolymer solution.
  • 450 g of water was added to a reaction vessel equipped with a homodisper capable of high-speed stirring, the temperature was adjusted to 25 ° C., and while stirring and mixing at 2000 min-1, the polyurethane prepolymer solution was added and dispersed in water. . Then, acetone and part of water were removed under reduced pressure to prepare a water-soluble polyurethane resin (D-1) having a solid content concentration of 35% by mass.
  • the glass transition temperature of the obtained polyurethane resin (D-1) was -30 ° C.
  • a coating liquid for easy adhesion was applied to one surface of this unstretched PET film so that the coating amount after drying was 0.08 g / m 2 , and then introduced into a drier and heated at 80 ° C. It was dried for 20 seconds.
  • the unstretched film on which this coating layer was formed was guided to a tenter stretching machine, guided to a hot air zone at a temperature of 125 ° C while gripping the end portion of the film with a clip, and stretched 4.0 times in the width direction.
  • heat setting treatment was performed at a temperature of 210 ° C. for 10 seconds, and further relaxation treatment of 3.0% was performed.
  • both ends of the cooled film were cut and wound with a tension of 0.4 kg / mm 2 to obtain a uniaxially oriented PET film (width 1800 cm, orientation film 1 for transfer) having a film thickness of 50 ⁇ m.
  • the center portion of the obtained film was slit into a width of 50 cm to obtain a film roll (slit film 1-c) having a length of about 500 m.
  • a 50 cm width on the right side was slit from the center of the obtained film to give a film roll (1-r1) having a length of about 500 m.
  • the right end portion of the obtained film was slit at a width of 50 cm to form a film roll (1-r2) having a length of about 500 m.
  • a width of 50 cm was slit from the center of the obtained film to a film roll (2-r1) having a length of about 500 m.
  • the width of the center of the right half of the obtained film was 50 cm, and a film roll (2-r2) having a length of about 500 m was slit.
  • the right end portion of the obtained film was slit at a width of 50 cm to form a film roll (2-r3) having a length of about 500 m.
  • Oxazoline group amount 7.7 mmol / g 30 mass% ⁇
  • the surface of the oligomer block coat layer containing no silica particles was used as the release surface.
  • Alignment film roll 13-c for transfer was obtained in the same manner as alignment film roll 11-c for transfer, except that PET (X-s) was used instead of PET (X-m). The central part was slit. The surface of the oligomer block coat layer was used as the release surface.
  • Table 1 shows the respective production conditions and characteristics of the above-mentioned oriented film roll for transfer.
  • Experimental example 1A (Rubbing Treatment Alignment Control Layer Formation) Unwind the orientation film roll 1-c for transfer, cut it out to a length of 30 cm, apply the rubbing treatment orientation control layer coating composition having the following composition to the surface of the non-easy adhesive coat using a bar coater, and dry at 80 ° C. for 5 minutes. Then, a film having a thickness of 200 nm was formed. Subsequently, the surface of the obtained film was treated with a rubbing roll wound with a nylon raised fabric to obtain a transfer orientation film in which a rubbing orientation control layer was laminated. The rubbing was performed at 45 degrees with respect to the short side of the cut out rectangle. Completely saponified polyvinyl alcohol (weight average molecular weight 800) 2 parts by mass Ion-exchanged water 100 parts by mass Surfactant 0.5 parts by mass
  • a solution for forming a retardation layer (liquid crystal compound alignment layer) having the following composition was applied to the surface subjected to the rubbing treatment by a bar coating method. After drying at 110 ° C. for 3 minutes and curing by irradiating with ultraviolet rays, a ⁇ / 4 layer as a retardation layer (liquid crystal compound alignment layer) is formed on the transfer alignment film 1-c, and the liquid crystal compound alignment layer is transferred.
  • a solution for forming a retardation layer liquid crystal compound alignment layer having the following composition was applied to the surface subjected to the rubbing treatment by a bar coating method. After drying at 110 ° C. for 3 minutes and curing by irradiating with ultraviolet rays, a ⁇ / 4 layer as a retardation layer (liquid crystal compound alignment layer) is formed on the transfer alignment film 1-c, and the liquid crystal compound alignment layer is transferred.
  • a ⁇ / 4 layer as a retardation layer
  • Rod-shaped liquid crystal compound (LC242 manufactured by BASF) 75 parts by mass The following compound 20 parts by mass Trimethylolpropane triacrylate 5 parts by weight Irgacure 379 3 parts by weight Surfactant 0.1 parts by weight Methyl ethyl ketone 250 parts by weight
  • Experimental Examples 2A, 3A, 6A to 21A, Experimental Example 2B Liquid crystal compound alignment layer transfer laminates of Experimental Examples 2A, 3A, 6A to 21A and Experimental Example 2B were produced in the same manner as in Experimental Example 1A except that the type of the transfer orientation film was changed as shown in Table 2. .
  • Experimental Examples 4A, 5A, Experimental Example 1B The transfer oriented film roll 1-r2 is cut into a length of about 30 cm, and the cut film has a large area such that the orientation axis of the film and the direction of the long side form 6 degrees, 9 degrees, and 15 degrees. Shaped into a rectangle.
  • the laminates for transferring the liquid crystal compound alignment layer of Experimental Examples 4A, 5A and Experimental Example 1B were produced in the same manner as in Experimental Example 3A except that this film was used.
  • Table 2 shows the evaluation results of the liquid crystal compound alignment layer transfer laminates of Experimental Examples 1A to 21A, 1B and 2B.
  • the numerical value of the item of “angle between MD or TD and the orientation direction (maximum position degree)” in Experimental Examples 4A and 5A and Experimental Example 1B in Table 2 is the angle between the long side of the rectangular sample and the orientation axis. Show.
  • Table 3 shows the effect of the oligomer block coat and the effect of the antistatic layer of the liquid crystal compound alignment layer transfer laminates of Experimental Examples 17A to 21A as compared with Experimental Example 1A.
  • Table 4 shows the surface roughness of the film of Experimental Example 1A as a representative. In the evaluation of the retardation layer, defects such as pinholes and scratches were not recognized.
  • the obtained laminate was treated with a 4% aqueous boric acid solution for 30 seconds, and then dipped in a mixed aqueous solution of iodine (0.2%) and potassium iodide (1%) for 60 seconds for dyeing. Then, it was treated with a mixed aqueous solution of potassium iodide (3%) and boric acid (3%) for 30 seconds. Further, this laminate was uniaxially stretched in the longitudinal direction in a mixed aqueous solution of boric acid (4%) and potassium iodide (5%) at 72 ° C., followed by washing with a 4% aqueous solution of potassium iodide, and an aqueous solution with an air knife.
  • a substrate laminated polarizer having a width of 30 cm and a length of 1000 m.
  • the total draw ratio was 6.5 times, and the thickness of the polarizer was 5 ⁇ m.
  • the thickness was read by embedding the substrate laminated polarizer in an epoxy resin, cutting out a section, and observing with an optical microscope.
  • the base laminated polarizer After bonding the polarizer surface of the above-mentioned base laminated polarizer to a super birefringent polyester film (Cosmoshine (R) SRF thickness 80 ⁇ m manufactured by Toyobo Co., Ltd.), the base laminated polarizer is bonded. The substrate was peeled off. Further, a commercially available optical pressure-sensitive adhesive sheet was laminated on the surface of the polarizer. The release film of the pressure-sensitive adhesive sheet was peeled off, the liquid crystal compound alignment layer surface of the laminate for transfer of liquid crystal compound alignment layer of Experimental Example 1A and the pressure-sensitive adhesive layer were bonded together, and then the alignment film in the laminate of Experimental Example 1A was peeled off. Then, a circularly polarizing plate was obtained.
  • a super birefringent polyester film Cosmoshine (R) SRF thickness 80 ⁇ m manufactured by Toyobo Co., Ltd.
  • the obtained circularly polarizing plate had a high antireflection function.
  • the slow axis of the Cosmoshine (R) SRF and the extinction axis of the polarizer were perpendicular to each other, and the MD direction of the Cosmoshine (R) SRF and the MD direction of the oriented film in the laminate of Experimental Example 1A were I made them parallel.
  • the alignment film for transferring the liquid crystal compound alignment layer of the present invention is suitable for the alignment state of the liquid crystal compound alignment layer (retardation layer or polarizing layer) provided thereon in a state in which the liquid crystal compound alignment layer is laminated on the alignment film. Can be evaluated. Further, the liquid crystal compound alignment layer transfer alignment film of the present invention, while using a stretched film such as polyester inexpensive and excellent in mechanical strength, it is possible to transfer the retardation layer and the polarizing layer in the alignment as designed, The problem of light leakage of the display can be prevented. Further, the liquid crystal compound alignment layer transfer alignment film of the present invention, while using a stretched film such as polyester that is inexpensive and excellent in mechanical strength, effectively prevents the rise of haze and the generation of foreign matter during heat treatment of the film.
  • a retardation layer laminated polarizing plate such as a circular polarizing plate can be stably manufactured with high quality.

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  • Physics & Mathematics (AREA)
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  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
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  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
  • Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)

Abstract

L'invention concerne : un film de transfert qui peut être utilisé comme film de transfert destiné à transférer une couche d'alignement de composé de cristaux liquides, et qui comprend un film étiré en polyester ou similaire qui est peu coûteux et qui présente une excellente résistance mécanique, et qui permet d'évaluer l'état d'alignement ou similaire d'une couche d'alignement de composé de cristaux liquides formée sur le film de transfert, même pendant la stratification de la couche d'alignement de composé de cristaux liquides sur le film de transfert ; un film de transfert qui peut transférer une couche d'alignement de composé de cristaux liquides dans un alignement conçu, tout en réduisant le problème de déviation dans la direction d'alignement de la couche d'alignement de composé de cristaux liquides transféré, et qui peut également empêcher l'apparition du problème de fuite de lumière à partir d'un dispositif d'affichage ; ou un film de transfert qui peut empêcher efficacement l'augmentation du trouble d'un film ou la formation de corps étrangers dans le film lors de l'étape de formation de la couche d'alignement de composé de cristaux liquides sur le film, et qui permet la formation d'une couche d'alignement de composé de cristaux liquides présentant un alignement conçu. L'invention concerne également un film d'alignement destiné à transférer une couche d'alignement de composé de cristaux liquides sur un objet d'intérêt, caractérisé en ce que l'angle formé entre la direction d'alignement du film d'alignement et la direction de déplacement du film d'alignement ou une direction orthogonale à la direction de déplacement est jusqu'à 14 degrés comme mesuré à 5 points, c'est-à-dire les deux points d'extrémité étant situés chacun sur les 5 cm à l'intérieur de chaque extrémité du film, un point central du film et des points médians étant chacun situés à mi-chemin entre le point central et chacun des deux points d'extrémité comme observé dans la direction de la largeur du film. Le film d'alignement destiné à transférer une couche d'alignement de composé de cristaux liquides sur un objet d'intérêt est caractérisé en ce que la différence entre le taux de retrait thermique tel que mesuré à 150 °C pendant 30 minutes dans la direction du déplacement du film d'alignement et le taux de retrait thermique tel que mesuré à 150 °C pendant 30 minutes dans une direction orthogonale à la direction du déplacement du film d'alignement est inférieure ou égale à 4 %. L'invention concerne en outre un film de polyester d'alignement destiné à transférer une couche d'alignement de composé de cristaux liquides sur un objet d'intérêt, caractérisé en ce que la quantité d'un trimère cyclique d'ester précipité sur la surface d'une face de libération de moule du film de polyester d'alignement après chauffage à 150 °C pendant 90 minutes est de 1,0 mg/m2 ou moins.
PCT/JP2019/041323 2018-10-26 2019-10-21 Film d'alignement permettant de transférer une couche d'alignement de composé de cristaux liquides WO2020085307A1 (fr)

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JP2020553395A JPWO2020085307A1 (ja) 2018-10-26 2019-10-21 液晶化合物配向層転写用配向フィルム
CN201980064549.8A CN112805136B (zh) 2018-10-26 2019-10-21 液晶化合物取向层转印用取向薄膜

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PCT/JP2019/041326 WO2020085310A1 (fr) 2018-10-26 2019-10-21 Film de transfert de couche d'alignement de composé à cristaux liquides
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