KR20210079272A - Alignment film for liquid crystal compound alignment layer transfer - Google Patents

Abstract

The present invention provides a transfer film capable of forming a retardation layer or a polarizing layer (liquid crystal compound alignment layer) with reduced occurrence of defects such as pinholes as a transfer film for transferring a liquid crystal compound alignment layer. An alignment film for transferring a liquid crystal compound alignment layer to an object, characterized in that the surface roughness (SRa) of the release surface of the alignment film is 1 nm or more and 30 nm or less, or the surface roughness of the surface opposite to the release surface of the alignment film (SRa) is 1 nm or more and 50 nm or less, and 10-point surface roughness (SRz) of the surface on the opposite side to the release surface of an orientation film is 10 nm or more and 1500 nm or less, It is characterized by the above-mentioned.

Description

Alignment film for liquid crystal compound alignment layer transfer

The present invention relates to a transfer film for transferring a liquid crystal compound alignment layer. More specifically, liquid crystal compound used when manufacturing a polarizing plate or retardation plate such as a circular 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, etc. It relates to a transfer film for transferring an alignment layer.

Conventionally, in an image display apparatus, in order to reduce reflection of extraneous light, a circularly polarizing plate is arrange|positioned on the panel surface of the viewer side of an image display panel. This circularly polarizing plate is constituted by a laminate of a linearly polarizing plate and a retardation film such as λ/4, and the extraneous light directed to the panel surface of the image display panel is converted into linearly polarized light by the linearly polarizing plate, followed by λ/4, etc. converted into circularly polarized light by the retardation film. When extraneous light due to circularly polarized light is reflected from the surface of the image display panel, the rotation direction of the polarization plane is reversed, and this reflected light is, conversely, a straight line in the direction blocked by the retardation film such as λ/4 by the linear polarizing plate. It is converted into polarized light, and then light is blocked by the linear polarizing plate, so that light emission to the outside is suppressed. Thus, for the circularly polarizing plate, what bonded retardation films, such as (lambda)/4, to a polarizing plate is used.

As retardation film, single-piece|unit retardation films, such as a cyclic olefin (refer patent document 1), polycarbonate (refer patent document 2), and a stretched film of triacetyl cellulose (refer patent document 3), are used. Moreover, as retardation film, the retardation film (refer patent documents 4 and 5) of a laminated body which has a retardation layer which consists of a liquid crystal compound on a transparent film is used. When providing the retardation layer (liquid crystal compound alignment layer) which consists of a liquid crystal compound in the above, it is described that a liquid crystal compound may be transcribe|transferred.

Moreover, the method of creating a retardation film by transcribe|transferring the retardation layer which consists of a liquid crystal compound to a transparent film is known in patent document 6 etc. There is also known a method in which a retardation layer made of a liquid crystal compound such as λ/4 is provided on a transparent film by such a transfer method to form a λ/4 film (see Patent Documents 7 and 8).

In these transfer methods, various things are introduced as a base material for transcription|transfer, Among them, transparent resin films, such as polyester, triacetyl cellulose, and cyclic polyolefin, are illustrated many.

However, when a retardation layer laminated polarizing plate (circular polarizing plate) manufactured using these transparent resin films as a transfer film substrate is used for antireflection of an image display device, pinhole-like or scratch-like light leakage may occur. Yes, it was a problem.

In addition, there is also known a method of manufacturing 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, but in this case as well, in the same manner as above, Light leakage in the form of scratches may occur, which has become a problem.

Japanese Patent Laid-Open No. 2012-56322 Japanese Patent Laid-Open No. 2004-144943 Japanese Patent Laid-Open No. 2004-46166 Japanese Patent Laid-Open No. 2006-243653 Japanese Patent Laid-Open No. 2001-4837 Japanese Patent Application Laid-Open No. 4-57017 Japanese Patent Laid-Open No. 2014-071381 Japanese Patent Laid-Open No. 2017-146616

This invention was made|formed against the subject of such prior art. That is, an object of the present invention is a transfer film that can form a retardation layer or a polarizing layer (liquid crystal compound alignment layer) with reduced occurrence of defects such as pinholes as a transfer film for transferring a liquid crystal compound alignment layer. that you want to provide.

In order to achieve this object, the present inventors studied the cause of defects such as pinholes in retardation layer laminated polarizing plates (circular polarizing plates) manufactured using a transparent resin film such as a polyester film as a transfer film substrate. . As a result, the microstructure of the surface of these film substrates greatly affects the orientation state and retardation of the liquid crystal compound in the retardation layer made of the liquid crystal compound formed on these film substrates, and the orientation state and phase difference as designed It may not be obtained, and it discovered that faults, such as a pinhole, generate|occur|produced for that reason. And, the present inventor pays attention to the surface roughness of the film base material expressed by a specific parameter among these microstructures, and by using a film base material whose surface roughness is controlled within a specific range, the above conventional problems do not occur. It found that it was possible to form a retardation layer and a polarizing layer (liquid crystal compound alignment layer) in which the occurrence of defects such as pinholes were reduced, and the first invention was completed.

In addition, since a film base material is normally stored and supplied in the state wound up in roll shape after manufacture, in the meantime, the release surface of a film base material (out of the two surfaces of a film base material, a liquid crystal compound The surface on which the retardation layer or the polarizing layer is formed) and the surface on the opposite side (the back surface) are in contact under pressure, so that the microstructure of the back surface may be transferred to the release surface, therefore, the microstructure of the back surface It was also found that the effect of the structure was large. And, the present inventor pays attention to the surface roughness of the film base material represented by a specific parameter among the microstructure of the back surface, and by using the film base material whose surface roughness is controlled within a specific range, the said conventional problem arises It was discovered that the retardation layer and the polarizing layer (liquid crystal compound alignment layer) in which generation|occurrence|production of faults, such as a pinhole, were reduced can be formed without doing this, and the 2nd invention was completed.

That is, 1st invention has the structure of the following (1)-(9).

(1) An alignment film for transferring a liquid crystal compound alignment layer to an object, wherein the surface roughness (SRa) of the release surface of the alignment film is 1 nm or more and 30 nm or less.

(2) 10-point surface roughness (SRz) of the release surface of an orientation film is 5 nm or more and 200 nm or less, The orientation film for liquid crystal compound orientation layer transcription|transfer as described in (1) characterized by the above-mentioned.

(3) Orientation film is a polyester film, The orientation film for liquid crystal compound orientation layer transcription|transfer as described in (1) or (2) characterized by the above-mentioned.

(4) A laminate in which a liquid crystal compound alignment layer and an alignment film are laminated, wherein the alignment film is the alignment film according to any one of (1) to (3), A laminate for transferring a liquid crystal compound alignment layer.

(5) A liquid crystal compound alignment characterized by including a step of bonding a polarizing plate and the liquid crystal compound alignment layer surface of the laminate according to (4) to form an intermediate laminate, and a step of peeling the alignment film from the intermediate laminate A method for manufacturing a layer-laminated polarizing plate.

(6) A method of inspecting the alignment state of the liquid crystal compound alignment layer in the laminate according to (4), in the alignment direction of the alignment film, or in a direction orthogonal to the alignment direction, or in the flow direction of the alignment film, or A liquid crystal compound alignment layer comprising the step of irradiating linearly polarized light having an electric field oscillation direction parallel to the direction orthogonal to the flow direction from the alignment film surface of the laminate, and receiving light from the liquid crystal compound alignment layer surface side. Inspection method of laminate for transfer.

(7) A method of inspecting the alignment state of the liquid crystal compound alignment layer in the laminate according to (4), comprising the step of irradiating elliptically polarized light from the liquid crystal compound alignment layer surface of the laminate and receiving light from the alignment film surface side Inspection method of a laminate for liquid crystal compound alignment layer transfer, characterized in that.

(8) A method for inspecting the alignment state of the liquid crystal compound alignment layer in the laminate according to (4), in the alignment direction of the alignment film, or in a direction orthogonal to the alignment direction, or in the flow direction of the alignment film, or A step of irradiating linearly polarized light having an electric field vibration direction parallel to the direction orthogonal to the flow direction from the oriented film surface of the laminate, and the light transmitted through the laminate is provided on the liquid crystal compound alignment layer side of the laminate. A method for inspecting a laminate for transferring a liquid crystal compound alignment layer, comprising: a step of reflecting by a reflecting plate; and a step of receiving the reflected light from an alignment film side.

(9) A method for inspecting the alignment state of the liquid crystal compound alignment layer in the laminate according to (4), at least a step of irradiating the laminate with polarized light to pass the polarized light through the laminate, and the polarized light passing through the laminate a light-receiving step, wherein the polarized light passing through the orientation film of the laminate is in the orientation direction of the orientation film, or in a direction orthogonal to the orientation direction, or in the flow direction of the orientation film, or in a direction orthogonal to the flow direction A method for inspecting a laminate for liquid crystal compound alignment layer transfer, characterized in that either linearly polarized light having an electric field oscillation direction parallel to , or polarized light passing through the liquid crystal compound alignment layer surface of the laminate is elliptically polarized light.

2nd invention has the structure of the following (1)-(9).

(1) An alignment film for transferring a liquid crystal compound alignment layer to an object, wherein the surface roughness (SRa) of the surface opposite to the release surface of the alignment film is 1 nm or more and 50 nm or less, and the side opposite to the release surface of the alignment film The alignment film for liquid crystal compound alignment layer transfer, characterized in that the 10-point surface roughness (SRz) of the surface is 10 nm or more and 1500 nm or less.

(2) The maximum height (SRy) of the surface on the opposite side to the release surface of an orientation film is 15 nm or more and 2000 nm or less, The orientation film for liquid crystal compound orientation layer transcription|transfer as described in (1) characterized by the above-mentioned.

(3) Orientation film is a polyester film, The orientation film for liquid crystal compound orientation layer transcription|transfer as described in (1) or (2) characterized by the above-mentioned.

(4) A laminate in which a liquid crystal compound alignment layer and an alignment film are laminated, wherein the alignment film is the alignment film according to any one of (1) to (3), A laminate for transferring a liquid crystal compound alignment layer.

(5) A liquid crystal compound alignment characterized by including a step of bonding a polarizing plate and the liquid crystal compound alignment layer surface of the laminate according to (4) to form an intermediate laminate, and a step of peeling the alignment film from the intermediate laminate A method for manufacturing a layer-laminated polarizing plate.

(6) A method of inspecting the alignment state of the liquid crystal compound alignment layer in the laminate according to (4), in the alignment direction of the alignment film, or in a direction orthogonal to the alignment direction, or in the flow direction of the alignment film, or A liquid crystal compound alignment layer transfer lamination comprising the step of irradiating linearly polarized light having an electric field oscillation direction parallel to a direction orthogonal to the flow direction from the alignment film side of the laminate, and receiving light from the liquid crystal compound alignment layer side side. How to check the body.

(7) A method of inspecting the alignment state of the liquid crystal compound alignment layer in the laminate according to (4), comprising the step of irradiating elliptically polarized light from the liquid crystal compound alignment layer surface of the laminate and receiving light from the alignment film surface side Inspection method of a laminate for liquid crystal compound alignment layer transfer, characterized in that.

(8) A method for inspecting the alignment state of the liquid crystal compound alignment layer in the laminate according to (4), in the alignment direction of the alignment film, or in a direction orthogonal to the alignment direction, or in the flow direction of the alignment film, or A step of irradiating linearly polarized light having an electric field oscillation direction parallel to the direction perpendicular to the flow direction from the alignment film surface of the laminate, and the light transmitted through the laminate is reflected by a mirror reflecting plate provided on the liquid crystal compound alignment layer side of the laminate A method for inspecting a laminate for transferring a liquid crystal compound alignment layer, comprising: a step of causing the light to be transferred; and a step of receiving the reflected light from the alignment film side.

(9) A method for inspecting the alignment state of the liquid crystal compound alignment layer in the laminate according to (4), at least a step of irradiating the laminate with polarized light to pass the polarized light through the laminate, and the polarized light passing through the laminate a light-receiving step, wherein the polarized light passing through the orientation film of the laminate is in the orientation direction of the orientation film, or in a direction orthogonal to the orientation direction, or in the flow direction of the orientation film, or in a direction orthogonal to the flow direction A method for inspecting a laminate for liquid crystal compound alignment layer transfer, characterized in that either linearly polarized light having an electric field oscillation direction parallel to , or polarized light passing through the liquid crystal compound alignment layer surface of the laminate is elliptically polarized light.

According to the present invention, by using a film whose surface roughness is controlled within a specific range as an orientation film for transfer of a retardation layer or a polarizing layer, a film in which the surface roughness of the surface opposite to the release surface is controlled within a specific range By using it as an orientation film for transfer of the retardation layer or the polarizing layer, the orientation state and retardation of the liquid crystal compound in the retardation layer or the polarizing layer can be set as designed, so the retardation layer or polarizing layer (liquid crystal) in which the occurrence of defects such as pinholes is reduced compound alignment layer) can be formed.

The oriented polyester film of the present invention is for transferring the liquid crystal compound alignment layer to an object (other transparent resin film, polarizing plate, etc.), and in the first invention, the surface roughness (SRa) of the release surface of the alignment film is 1 nm or more, It is characterized by being 30 nm or less, and in 2nd invention, the surface roughness (SRa) of the surface on the opposite side to the release surface of an orientation film is 1 nm or more and 50 nm or less, It is characterized by the above-mentioned. In addition, when an oligomer block coating layer, a release layer, a planarization coating layer, a lubricating coating layer, an antistatic coating layer, etc. mentioned later are provided, these layers may be called an orientation film.

The resin constituting the film substrate used for the oriented film is not particularly limited as long as it can maintain the strength as the substrate for the oriented film, and among them, polyester, polycarbonate, polystyrene, polyamide, polypropylene, cyclic polyolefin, triacetyl Cellulose is preferable, and polyethylene terephthalate, cyclic polyolefin, and triacetyl cellulose are particularly preferable.

As a structure, the oriented film of this invention may be a single layer, or multiple layers by coextrusion may be sufficient as it. In the case of multiple layers, a structure such as surface layer (release side layer A)/back side layer (B), A/middle layer (C)/A (the release side layer and back side layer are the same), A/C/B, etc. are mentioned can

When stretching a film, either uniaxial stretching, weak biaxial stretching (stretching in the biaxial direction but weak in one direction), or biaxial stretching may be used, but orientation in a wide range in the width direction From the viewpoint that the direction can be made constant, uniaxial stretching or about biaxial stretching is preferable. In the case of about biaxial stretching, it is preferable to make the main orientation direction into the extending|stretching direction of a rear end. In the case of uniaxial stretching, the direction (horizontal direction) orthogonal to the flow direction (vertical direction) of film manufacture may be sufficient as an extending|stretching direction.

In the case of biaxial stretching, simultaneous biaxial stretching may be sufficient as sequential biaxial stretching. As for extending|stretching in a longitudinal direction, extending|stretching by roll groups with different speed differences is preferable, and, as for extending|stretching in a transverse direction, tenter extending|stretching is preferable.

The oriented film for transfer is industrially supplied by the roll which wound the film. The lower limit of the roll width is preferably 30 cm, more preferably 50 cm, still more 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, still more preferably 3000 cm.

The lower limit of the roll length is preferably 100 m, more preferably 500 m, still more preferably 1000 m. Preferably the upper limit of the roll length is 100000 m, More preferably, it is 50000 m, More preferably, it is 30000 m.

(Roughness of the heterogeneous surface)

It is preferable that the release surface (A-layer surface) of the oriented film for transcription|transfer of this invention is smooth. In addition, in this invention, the "release surface" of an orientation film means the surface by which the liquid crystal compound orientation layer to which the orientation film transcribe|transfers among the surfaces of an orientation film is intended to be provided. When a liquid crystal compound alignment layer is provided on the oligomer block coat layer, planarization coat layer or release layer, which will be described later, the surface of these oligomer block coat layers, planarization layer, release layer, etc. (liquid crystal compound alignment layer and The contact surface) is a "release surface" of an oriented film.

The lower limit of the three-dimensional arithmetic mean roughness (SRa) of the release surface of the oriented film for transfer of the present invention is preferably 1 nm, more preferably 2 nm. If it is less than the above, it may be difficult to realistically achieve the numerical value. In addition, the upper limit of SRa of the release surface of the oriented film for transfer of the present invention is preferably 30 nm, more preferably 25 nm, still more preferably 20 nm, particularly preferably 15 nm, and most preferably 10 nm. .

The lower limit of the three-dimensional ten-point average roughness (SRz) of the release surface of the oriented film for transfer of the present invention is preferably 5 nm, more preferably 10 nm, still more preferably 13 nm. Moreover, the upper limit of SRz of the release surface of the oriented film for transcription|transfer of this invention becomes like this. Preferably it is 200 nm, More preferably, it is 150 nm, More preferably, it is 120 nm, Especially preferably, it is 100 nm, Most preferably, it is 80 nm. .

The lower limit of the maximum height of the release surface of the oriented film for transfer of the present invention (SRy: release surface maximum peak height SRp + release surface maximum valley depth SRv) is preferably 10 nm, more preferably 15 nm, still more preferably 20 nm to be. In addition, the upper limit of SRy of the release surface of the oriented film for transfer of the present invention is preferably 300 nm, more preferably 250 nm, still more preferably 150 nm, particularly preferably 120 nm, and most preferably 100 nm. .

The upper limit of the number of projections of 0.5 µm or more in height difference of the release surface of the transfer oriented film of the present invention is preferably 5 pieces/m2, more preferably 4 pieces/m2, still more preferably 3 pieces/m2, It is particularly preferably 2 pieces/m 2 , and most preferably 1 piece/m 2 .

When the roughness of the release surface exceeds the above range, the alignment state or phase difference as designed does not occur in the minute portion of the liquid crystal compound alignment layer formed on the transfer alignment film of the present invention, and pinhole-like or scratch-like defects may occur. . This reason is considered as follows. First, as described later, an orientation control layer such as a rubbing treatment orientation control layer or a photo-alignment control layer can be provided between the transfer orientation film and the liquid crystal compound orientation layer, but if this orientation control layer is a rubbing treatment orientation control layer, , that the orientation control layer of the convex part peels off at the time of rubbing, or that the rubbing of the base part of a convex part, or a recessed part becomes inadequate is considered as a cause of fault generation. Moreover, when particle|grains are included in a release surface layer, the particle|grains fall off at the time of rubbing, and damage to the surface is also considered to be a cause of fault generation|occurrence|production. In addition, whether the rubbing treatment orientation control layer or the optical orientation control layer is used, when the film is wound while the orientation control layer is provided, it rubs with the back surface layer, so that a hole is formed in the orientation control layer of the convex portion, or by pressure Disorder of orientation is also considered to be a cause of fault occurrence. Due to such defects in the orientation control layer, when the liquid crystal compound alignment layer is installed on the orientation control layer, the alignment of the liquid crystal compound does not occur properly in the minute portions, and the orientation state and phase difference as designed cannot be obtained, and as a result, pinholes It is thought that the defect of an image or a flaw image arises.

Moreover, even when a liquid crystal compound orientation layer is directly formed on the orientation film for transcription|transfer without providing an orientation control layer, liquid crystal compound orientation in the convex part of the release surface of an orientation film at the time of coating of a liquid crystal compound. The inability to obtain the phase difference as designed is considered to be the cause of the defect, for example, when the thickness of the layer becomes thin or, conversely, in the concave portion of the release surface of the alignment film, the thickness of the liquid crystal compound alignment layer becomes thick.

In order to make the roughness of a mold release surface (A) into the said range, when the oriented film for transcription|transfer of this invention is a stretched film, the following method is mentioned.

· It is assumed that the release surface side layer (surface layer) of the original film does not contain particles.

· When the release surface side layer (surface layer) of the original film contains particles, use particles with a small particle size.

- When the release surface side layer (surface layer) of the original film contains particles, a flattening coat is provided.

In addition, in this invention, the "release surface side layer" of an oriented film means the layer in which a mold release surface exists among each layer of resin which comprises an oriented film. Here, even when the film is a single layer, it is sometimes referred to as a release surface side layer. In this case, the back side layer and the release side layer, which will be described later, become the same layer.

In addition to the above, it is also important to clean raw materials and manufacturing processes as follows.

· Filter the particle slurry during polymerization. Filter before chipping.

・Clean the chipping coolant. Clean the environment from chip transfer to film maker input.

・At the time of film forming, the molten resin is filtered to remove aggregated particles and foreign matter.

· Filter the coating agent to remove foreign matter.

· Perform in a clean environment during film forming, coating, and drying.

It is preferable that the surface layer contains substantially no particles for smoothing. Substantially free of particles means that the particle content is less than 50 ppm, preferably less than 30 ppm.

In order to raise the surface sliding property, the surface layer may contain the particle|grains. In the case of including particles, the lower limit of the content of the surface layer particles is preferably 50 ppm, more preferably 100 ppm. Moreover, Preferably the upper limit of surface layer particle content is 20000 ppm, More preferably, it is 10000 ppm, More preferably, it is 8000 ppm, Especially preferably, it is 6000 ppm. When the above is exceeded, the roughness of the surface layer may not be able to be made into a preferable range.

The lower limit of the particle diameter of the surface layer is preferably 0.005 µm, more preferably 0.01 µm, still more preferably 0.02 µm. The upper limit of the particle diameter of the surface layer is preferably 3 µm, more preferably 1 µm, still more preferably 0.5 µm, and particularly preferably 0.3 µm. When the above is exceeded, the roughness of the surface layer may not be able to be made into a preferable range.

Even when the surface layer does not contain particles or is made of particles having a small particle size, when the lower layer contains particles, the roughness of the release surface layer may become high under the influence 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 take a method such as providing a lower layer (intermediate layer) containing no particles.

The lower limit of the thickness of the surface layer is preferably 0.1 µm, more preferably 0.5 µm, still more preferably 1 µm, particularly preferably 3 µm, and most preferably 5 µm. Moreover, with respect to the total thickness of the oriented film for transcription|transfer, the upper limit of surface layer thickness becomes like this. Preferably it is 97 %, More preferably, it is 95 %, More preferably, it is 90 %.

The particle-free intermediate layer means substantially no particles, and the particle content is less than 50 ppm, preferably less than 30 ppm. With respect to the total thickness of the oriented film for transcription, the minimum of the thickness of an intermediate|middle layer becomes like this with respect to the total thickness of the oriented film for transcription, Preferably it is 10 %, More preferably, it is 20 %, More preferably, it is 30 %. The upper limit is preferably 95%, more preferably 90%.

When the roughness of the surface layer of the oriented film for transcription is high, you may provide a flattening coat. Examples of the resin used for the flattening coating include those generally used as resins for coating agents, such as polyester, acrylic, polyurethane, polystyrene, and polyamide. It is also preferable to use crosslinking agents, such as a melamine, isocyanate, an epoxy resin, and an oxazoline compound. These are coated and dried as a coating agent dissolved or dispersed in an organic solvent or water. Alternatively, in the case of acrylic, it may be coated with a solvent-free solvent and cured by radiation. The flattening 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 planarization coating layer is preferably 0.01 µm, more preferably 0.1 µm, still more preferably 0.2 µm, and particularly preferably 0.3 µm. If it is less than the above, the effect of planarization may become insufficient. In addition, the upper limit of the thickness of the surface planarization coating layer is preferably 10 µm, more preferably 7 µm, still more preferably 5 µm, and particularly preferably 3 µm. Even if it exceeds the above, further flattening effect may not be acquired.

The flattening coat may be installed as an inline coat during the film forming process, or may be separately installed offline.

(Roughness on the back side)

Moreover, even if it smoothes the release surface of the orientation film for transcription|transfer of this invention, a fault may generate|occur|produce in a liquid crystal compound orientation layer. This is because the oriented film for transfer is supplied in a rolled state, and the release surface and the back surface are in contact, and the roughness of the back surface is transferred to the release surface (the convex portion on the back surface is transferred to the release layer to form a concave portion). okay. In order to protect the liquid crystal compound aligning layer, in order to protect the liquid crystal compound aligning layer, the oriented film for transcription may be wound up by bonding a masking film, but for cost reduction, it is wound up as it is in many cases. When the liquid crystal compound alignment layer is wound in a state in which the liquid crystal compound alignment layer is provided in this way, it is considered that the liquid crystal compound alignment layer is dented, punctured, or distorted due to the convex part on the back surface. In addition, a phenomenon in which the liquid crystal compound alignment layer is punctured by the convex part on the back surface and the alignment is disturbed even when the liquid crystal compound alignment layer is provided later instead of being wound in a state in which the liquid crystal compound alignment layer is provided. I think this is happening. In particular, in the core part (卷芯部), the pressure is high and this phenomenon is easy to occur. From the above knowledge, it turned out that the said fault can be prevented effectively by making the roughness of the surface (back surface) on the side opposite to a mold release surface within a specific range.

The lower limit of the three-dimensional arithmetic mean roughness (SRa) of the back surface of the orientation film for transfer of the present invention is preferably 1 nm, more preferably 2 nm, still more preferably 3 nm, particularly preferably 4 nm, most preferably 5 nm. Moreover, Preferably the upper limit of SRa of the back surface of the orientation film for transcription|transfer of this invention is 50 nm, More preferably, it is 45 nm, More preferably, it is 40 nm. When the above is exceeded, a fault may increase.

The lower limit of the three-dimensional ten-point average roughness (SRz) of the back surface of the oriented film for transfer of the present invention is preferably 10 nm, more preferably 15 nm, particularly preferably 20 nm, and most preferably 25 nm. Moreover, the upper limit of SRz of the back surface of the oriented film for transcription|transfer of this invention becomes like this. Preferably it is 1500 nm, More preferably, it is 1200 nm, More preferably, it is 1000 nm, Especially preferably, it is 700 nm, Most preferably, it is 500 nm. When the above is exceeded, a fault may increase.

The lower limit of the maximum height of the rear surface of the transfer oriented film of the present invention (SRy: maximum peak height SRp + maximum valley depth SRv on the rear surface) of the present invention is preferably 15 nm, more preferably 20 nm, still more preferably 25 nm, particularly It is preferably 30 nm, most preferably 40 nm. In addition, 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, still more preferably 1200 nm, particularly preferably 1000 nm, and most preferably 700 nm. to be. When the above is exceeded, a fault may increase.

The upper limit of the number of protrusions on the back surface of the oriented film for transfer of the present invention with a height difference of 2 µm or more is preferably 5 pieces/m2, more preferably 4 pieces/m2, still more preferably 3 pieces/m2, especially Preferably it is 2 pieces/m<2>, and most preferably, it is 1 piece/m<2>. When the above is exceeded, a fault may increase.

When the roughness of the back surface of the oriented film for transfer of the present invention represented by the above parameters is less than the above range, the film slipperiness deteriorates, and the film becomes less slippery at the time of conveyance to a roll, winding, etc., and is prone to scratches. there is In addition, in winding at the time of film production, winding is not stable, wrinkles are generated, resulting in defective products, or irregularities at the ends of the wound roll become large, so that meandering of the film tends to occur in the next step, or , it becomes easy to break.

Moreover, when the roughness of the back surface of the oriented film for transcription|transfer of this invention exceeds the above, it will become easy to produce the above-mentioned fault.

In order to make the roughness of the back surface into the said range, when the oriented film for transcription|transfer of this invention is a stretched film, the following method is mentioned.

- The back side layer (back side layer) of the original film shall contain specific particle|grains.

· A film containing particles is used as the intermediate layer of the original film, and the thickness is reduced by not containing particles in the back side layer (back side layer).

- When the roughness of the back side layer (rear layer) of the original film is large, a flattening coat is provided.

· When the back side layer (rear layer) of the original film does not contain particles or has a small roughness, a lubricating coat (particle-containing coat) is provided.

The lower limit of the particle diameter of the back surface layer is preferably 0.01 µm, more preferably 0.05 µm, still more preferably 0.1 µm. If it is less than the above, slipperiness may worsen and winding failure may occur. In addition, the upper limit of the particle diameter of the back surface layer is preferably 5 µm, more preferably 3 µm, still more preferably 2 µm. When the above is exceeded, the back surface may become too rough.

When the back side contains particles, the lower limit of the particle content of the back side layer is preferably 50 ppm, more preferably 100 ppm. If it is less than the above, the effect of sliding properties by adding particles may not be obtained. Further, the upper limit of the back layer particle content is preferably 10000 ppm, more preferably 7000 ppm, and still more preferably 5000 ppm. When the above is exceeded, the back surface may become too rough.

The lower limit of the thickness of the backing layer is preferably 0.1 μm, more preferably 0.5 μm, still more preferably 1 μm, particularly preferably 3 μm, and most preferably 5 μm. Further, the upper limit of the thickness of the back layer is preferably 95%, more preferably 90%, still more preferably 85% with respect to the total thickness of the oriented film for transfer.

It is also preferable to control the roughness of the back surface by including particles in the intermediate layer and thinning the back layer without including particles. By taking such a form, the roughness of the back surface can be ensured, preventing drop-off|omission of particle|grains.

The particle size and addition amount of the particles of the intermediate layer are the same as those of the particles of the back surface layer. In this case, the lower limit of the thickness of the back layer is preferably 0.5 µm, more preferably 1 µm, and still more preferably 2 µm. The upper limit of the thickness is preferably 30 µm, more preferably 25 µm, still more preferably 20 µm.

When the back surface of the raw film is rough, it is also preferable to provide a flattening coat. As for the leveling coat, those exemplified in the leveling coat of the surface can be used similarly.

The lower limit of the thickness of the back surface planarization coating layer is preferably 0.01 µm, more preferably 0.03 µm, still more preferably 0.05 µm. If it is less than the above, the effect of planarization may become small. Moreover, the upper limit of the thickness of the back surface planarization coating layer becomes like this. Preferably it is 10 micrometers, More preferably, it is 5 micrometers, More preferably, it is 3 micrometers. Even if it exceeds the above, the effect of planarization will become saturated.

The back side of the raw film may not contain particles, and a lubricating coat containing particles may be provided on the back surface. Moreover, when the roughness of the back surface of a raw film is small, you may provide a lubricating coat.

The lower limit of the particle diameter of the back surface lubricating coating layer is preferably 0.01 µm, more preferably 0.05 µm. If it is less than the above, lubricating activity may not be obtained. The upper limit of the particle diameter of the back surface lubricating coating layer is preferably 5 µm, more preferably 3 µm, still more preferably 2 µm, and particularly preferably 1 µm. When it exceeds the above, the roughness of the back surface may be too high.

The lower limit of the particle content of the back surface lubricating coating layer is preferably 0.1 mass%, more preferably 0.5 mass%, still more preferably 1 mass%, particularly preferably 1.5 mass%, most preferably 2 mass%. If it is less than the above, lubricating activity may not be obtained. In addition, the upper limit of the particle content of the back surface lubricating coating layer is preferably 20 mass%, more preferably 15 mass%, still more preferably 10 mass%. When it exceeds the above, the roughness of the back surface may be too high.

The lower limit of the thickness of the back surface lubricating coating layer is preferably 0.01 µm, more preferably 0.03 µm, and still more preferably 0.05 µm. The upper limit of the thickness of the back surface lubricating coating layer is preferably 10 µm, more preferably 5 µm, still more preferably 3 µm, particularly preferably 2 µm, and most preferably 1 µm.

Although the case where the orientation film for transcription|transfer of this invention is a stretched film was demonstrated above, the dope which melt|dissolved triacetyl cellulose etc. in a solvent is expanded into a metal belt etc., The unstretched film formed into a film by the casting method which dries the solvent. Even in the case of a film, by adding particles, irregularities due to particles are generated on the upper surface (opposite surface of the metal belt) with the removal of the solvent, so that roughness can be adjusted. In this case, it is preferable to make the surface roughness of a metal belt small and to make a metal belt surface into a mold release surface. In addition, when particles are contained in the dope, when peeling from the metal belt in a state with a large solvent content, irregularities due to the particles may also appear on the metal belt surface. Therefore, peeling from the metal belt after drying to a state with a low solvent content is also desirable. The roughness can also be adjusted by the timing of such peeling. Moreover, when extending|stretching and drying within a tenter in the state containing a little quantity of a solvent, roughness can also be adjusted by a draw ratio etc. Moreover, when particle|grains are not included, it is good also considering the metal belt surface as a back surface by adjusting the roughness of a metal belt. Moreover, you may transcribe|transfer the roughness to the surface while drying while passing between rolls with different roughness.

Moreover, even in the case of the unstretched film formed into a film by casting molten resin, such as COP, by adding particle|grains, roughness can be adjusted. By using particles having a thermal expansion coefficient different from that of the film resin, such as inorganic particles, irregularities due to the added particles can be formed on the surface due to thermal contraction occurring during cooling. In this case, it is preferable to set it as a mold release surface by making small the surface roughness of the cooling roll which extrudes molten resin in sheet form. Moreover, it is good also as a back surface by roughening a cooling roll, transcribe|transferring a roughness. The roughness may be transferred by passing between rolls having different roughness at a temperature equal to or higher than the Tg of the film resin.

Moreover, even if it is such an unstretched film, similarly to a stretched film, roughness can also be adjusted by the smooth coat or the lubricating coat containing particle|grains.

Next, the further characteristic of the oriented film for transcription|transfer of this invention is demonstrated.

(Orientation characteristics and physical properties of oriented film for transfer)

When the alignment film for transfer is an unstretched film and the retardation is almost zero, the alignment state of the liquid crystal compound alignment layer may be inspected by irradiating linearly polarized light in a state in which the liquid crystal compound alignment layer is laminated on the alignment film for transfer. For example, when the liquid crystal compound alignment layer is a retardation layer, a sample is irradiated with linearly polarized light in an oblique direction (for example, 45 degrees) with respect to the slow axis of the retardation layer to be inspected, and the polarized light becomes elliptically polarized by the retardation layer. is passed through another retardation layer to return to linearly polarized light, and light is received through a polarizing plate in which the linearly polarized light is in a quenched state. Thereby, when the phase difference layer has a pinhole-like defect, a defect can be detected as a luminescent point.

On the other hand, when it is a stretched film etc. and has retardation, it may be difficult to test|inspect the orientation state of the liquid crystal compound orientation layer in the state in which the liquid crystal compound orientation layer was laminated|stacked under the influence of retardation. Conventionally, with respect to the fault of the retardation layer provided on the oriented film for transfer with retardation, it was possible to detect faults, such as a foreign material, by irradiating non-polarized light, but the fault of a polarization state is independent by peeling the retardation layer. It was necessary to test by using a device or by transferring it to an object without retardation such as glass.

However, it turned out that the orientation state of the liquid crystal compound orientation layer can be test|inspected in the state in which the liquid crystal compound orientation layer was laminated|stacked by using the film whose slow axis of a film became a specific range as an orientation film for transcription|transfer.

In general, a polarizer is used in which polyvinyl alcohol is stretched in the flow direction of a film, and a dichroic dye of iodine or an organic compound is absorbed therein, and the extinction axis (absorption axis) of the polarizer is in the flow direction of the film. In the case of a circular polarizing plate, the slow axis (orientation direction) of the λ/4 layer as a retardation layer is laminated at 45 degrees to the extinction axis, or the λ/4 layer and the λ/2 layer are laminated in an oblique direction (10 to 80 degrees). . Moreover, the optical compensation layer used for a liquid crystal display is also laminated|stacked in the diagonal direction with respect to the extinction axis of a polarizer.

Therefore, the orientation state of the retardation layer is, for example, linearly polarized light having a vibration direction parallel to or perpendicular to the flow direction of the film to the retardation layer from the oriented film side for transfer, and light that becomes elliptically polarized light in the retardation layer can be inspected (evaluated) by passing through a light-receiving-side retardation plate for returning to linearly polarized light and a light-receiving-side polarizing plate installed in a direction not to pass the linearly polarized light returned by the retardation plate, and detecting by the light-receiving element. Conversely, elliptically polarized light may be irradiated from the retardation layer side, and light converted into linearly polarized light by the retardation layer may be similarly detected. Specifically, when the retardation layer has a pinhole-like defect, the defect can be detected as a bright spot.

For this reason, when the orientation film for transcription|transfer has birefringence, if the orientation direction of a film deviate|deviates from the direction parallel to the flow direction of a film (MD direction) or perpendicular|vertical direction (TD direction) with respect to the flow direction of a film, the straight line passing through the film Polarized light becomes elliptically polarized light, light leakage occurs, and accurate evaluation of the retardation layer becomes difficult.

The lower limit of the angle (maximum point) between MD or TD of the orientation film for transfer of the present invention and the orientation direction is preferably 0 degrees. Moreover, the upper limit of the angle between MD or TD of the orientation film for transcription|transfer of this invention and an orientation direction becomes like this. Preferably it is 14 degrees at maximum, More preferably, it is 7 degrees, More preferably, it is 5 degrees, and especially preferable Preferably it is 4 degrees, and most preferably it is 3 degrees. When it exceeds the above, it may become difficult to evaluate the orientation state of retardation layer (liquid crystal compound orientation layer).

The lower limit of the angle difference of the orientation angle in the full width (width direction) of the orientation film for transcription|transfer of this invention becomes like this. Preferably it is 0 degree|times. Moreover, the upper limit of the angular difference of the orientation angle in the full width of the orientation film for transcription|transfer of this invention becomes like this. Preferably it is 7 degrees, More preferably, it is 5 degrees, More preferably, it is 3 degrees, Especially preferably, it is 2 degrees. It is also When the above is exceeded, it may become difficult to evaluate the orientation state of retardation layer (liquid crystal compound orientation layer) in the width direction.

In the case of stretching in the TD direction in the tenter, a force decreasing in the MD direction acts on the film in the stretching zone or the heat setting zone. The end of the film is fixed with a clip, but the central portion is not fixed, so bowing occurs late in an arc at the tenter exit. This becomes a distortion in the orientation direction.

In order to reduce the distortion in the orientation direction and achieve the above characteristics, the stretching temperature, the stretching ratio, the stretching rate, the heat setting temperature, the temperature of the relaxation step, the magnification of the relaxation step, the temperature distribution in the width direction of each temperature, etc. are appropriately adjusted Do it.

Moreover, when the orientation direction does not fall within the prescribed range in the full width of the film formed into a film, it is preferable to employ|adopt the part used as the said characteristic range, such as center part vicinity of the extended|stretched wide light film. Moreover, since the distortion in an orientation direction tends to become small when the orientation in a uniaxial direction is strengthened, it is also preferable to employ|adopt an about biaxial or uniaxially stretched film. In particular, an about biaxial or uniaxially oriented film whose MD direction is the main orientation direction is preferable.

In addition, in this invention, the angle difference of the orientation angle of the orientation direction of the orientation film for transcription|transfer, the direction orthogonal to the flow direction or flow direction of an orientation film, and the orientation angle in the width direction of a film is determined as follows do.

First, the film was taken out from the roll, and the orientation directions were determined at five places at both ends (a point 5 cm inward from each end), the central part, and the middle part midway between the central part and both ends. The middle part which is in the middle of a center part and both ends exists in the position which divided the space|interval of the center part and both ends into two. In addition, the orientation direction was made into the slow-axis direction of the film calculated|required using the molecular orientation meter. Next, it was investigated whether the whole orientation direction of a film is close to a flow direction (MD), or whether it is close to a width direction (TD). And, when the orientation direction of the whole film is close to the flow direction, in each of the above five places, the angle between the orientation direction and the flow direction of the film is obtained, and the value at the location serving as the largest angle is "oriented film" The angle between the orientation direction of , and the flow direction of the orientation film" was adopted as the maximum value. 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 obtained in each of the above five places, and the value at the location which becomes the largest angle was adopted as the maximum value of "the angle between the orientation direction of an orientation film and the direction orthogonal to the flow direction of an orientation film."

Moreover, the difference between the maximum value and the minimum value was made into "angle difference of the orientation angle|corner in the width direction of a film" among the angles calculated|required in the said five places.

Incidentally, the angle is positive when the orientation direction is on the same side as the maximum value in the longitudinal direction or the width direction, and negative when the orientation direction is on the opposite side to the longitudinal or width direction. As the value of (負), the minimum value is evaluated by distinguishing between positive and negative.

The minimum of the difference in thermal contraction rate for 30 minutes at 150 degreeC of the MD direction and TD direction of the orientation film for transcription|transfer of this invention becomes like this. Preferably it is 0 %. In addition, the upper limit of the difference in thermal contraction rate for 30 minutes at 150°C in the MD direction and the TD direction of the oriented film for transfer of the present invention is preferably 4%, more preferably 3%, still more preferably 2%, Especially preferably, it is 1.5 %, Most preferably, it is 1 %. If the above is exceeded, the orientation direction of the liquid crystal compound deviates from the design when a high temperature is required for the alignment treatment of the liquid crystal compound or when a plurality of liquid crystal compounds are laminated and the temperature history increases, and light leakage when a polarizing plate is used for a display, etc. There are cases where this occurs.

The lower limit of the thermal contraction rate for 30 minutes at 150°C in the MD direction of the oriented film for transfer of the present invention is preferably -2%, more preferably -0.5%, still more preferably -0.1%, particularly preferably is 0%, most preferably 0.01%. If it is less than the above, it may be difficult to realistically achieve the numerical value. Moreover, Preferably the upper limit of the thermal contraction rate for 150 degreeC 30 minutes of MD direction of the oriented film for transcription|transfer of this invention is 4 %, More preferably, it is 3 %, More preferably, it is 2.5 %, Especially preferably, 2%, most preferably 1.5%. When it exceeds the above, it may become difficult to adjust the difference of thermal contraction rate. Moreover, planarity may worsen and workability|operativity may deteriorate.

The lower limit of the thermal contraction rate for 30 minutes at 150°C in the TD direction of the oriented film for transfer of the present invention is preferably -2%, more preferably -0.5%, still more preferably -0.1%, particularly preferably is 0%, most preferably 0.01%. If it is less than the above, it may be difficult to realistically achieve the numerical value. Moreover, preferably the upper limit of the thermal contraction rate for 150 degreeC 30 minutes of TD direction of the oriented film for transcription|transfer of this invention is 4 %, More preferably, it is 2.5 %, More preferably, it is 2 %, Especially preferably, 1.5%, most preferably 1%. When it exceeds the above, it may be difficult to adjust the difference of thermal contraction rate. Moreover, planarity may worsen and workability|operativity may deteriorate.

The lower limit of the difference in thermal contraction rate for 30 minutes at 150°C in the direction of 45 degrees with respect to the MD direction of the oriented film for transfer of the present invention and the direction of 135 degrees with respect to the MD direction is preferably 0%. If it is less than the above, it may be difficult to realistically achieve the numerical value. Moreover, the upper limit of the difference in thermal contraction rate for 30 minutes at 150 degreeC in the direction of 45 degrees with respect to the MD direction of the oriented film for transcription|transfer of this invention and the direction of 135 degrees with respect to MD direction becomes like this. Preferably it is 4 %, More preferably, it is 3 %. , more preferably 2%, particularly preferably 1.5%, and most preferably 1%. If it is out of the above range, the alignment direction of the liquid crystal compound may be deviating from the design, and light leakage may occur when a polarizing plate is used for a display.

The heat shrinkage characteristics of the film can be controlled by the stretching temperature, the stretching ratio, the heat setting temperature, the magnification of the relaxation process, the temperature of the relaxation process, and the like. Moreover, it is also preferable that the surface temperature of a film opens and winds from a clip at 100 degreeC or more during a cooling process. The opening from the clip may be a method of opening a clip or a method of cutting off the end portion held by the clip with a blade or the like. In addition, off-line heat treatment (annealing treatment) is also an effective method.

In order to make the heat-shrinkage characteristic for 150 degreeC 30 minute(s) of the oriented film for transcription|transfer of this invention above, it is preferable that the raw material of the oriented film for transcription|transfer is polyester, especially polyethylene terephthalate.

The lower limit of the 95 degreeC maximum thermal contraction rate of the oriented film for transcription|transfer of this invention becomes like this. Preferably it is 0 %, More preferably, it is 0.01 %. If it is less than the above, it may be difficult to realistically achieve the numerical value. Moreover, the upper limit of the 95 degreeC maximum thermal contraction rate of the oriented film for transcription|transfer of this invention becomes like this. Preferably it is 2.5 %, More preferably, it is 2 %, More preferably, it is 1.2 %, Especially preferably, it is 1 %, and most Preferably it is 0.8 %. When the above is exceeded, when a polarizing plate is used for a display, light leakage etc. may generate|occur|produce.

The lower limit of the angle between the maximum thermal contraction rate direction and the MD or TD direction of the oriented film for transfer of the present invention is preferably 0 degrees. Moreover, the upper limit of the angle of the maximum thermal contraction rate direction of the oriented film for transcription|transfer of this invention and MD or TD direction becomes like this. Preferably it is 20 degrees, More preferably, it is 15 degrees, More preferably, it is 10 degrees, Especially preferable Preferably, it is 7 degrees, and most preferably, it is 5 degrees. When the above is exceeded, the orientation direction of the liquid crystal compound deviates from the design, and when a polarizing plate is used for a display, light leakage or the like may occur.

The lower limit of the elastic modulus in the MD direction and the elastic modulus in the TD direction of the oriented film for transfer of the present invention is preferably 1 GPa, more preferably 2 GPa. If it is less than the above, it may stretch in each process and may not become the orientation direction as designed. Moreover, Preferably the upper limit of the elastic modulus of the MD direction and TD direction of the oriented film for transcription|transfer of this invention is 8 GPa, More preferably, it is 7 GPa. If the above is exceeded, it may be difficult to realistically achieve the numerical value.

When the oriented film for transfer of the present invention is a polyester film, the precipitation amount of the ester cyclic trimer on the surface of the release surface of the oriented polyester film after heating at 150° C. for 90 minutes (hereinafter referred to as the surface oligomer precipitation amount (150° C.) 90 min)), preferably 0 mg/m 2 , more preferably 0.01 mg/m 2 . If it is less than the above, it may be difficult to realistically achieve the numerical value. The upper limit of the surface oligomer precipitation amount (150°C 90 min) is preferably 1 mg/m2, more preferably 0.7 mg/m2, still more preferably 0.5 mg/m2, particularly preferably 0.3 mg/m2. When it exceeds the above, when a plurality of liquid crystal compound alignment layers are laminated or when alignment treatment at a high temperature is required, haze increases or foreign matter is generated, so that polarization is disturbed during alignment control by ultraviolet irradiation, and the retardation layer as designed or It may become impossible to obtain a polarizing layer. In addition, in this invention, the "release surface" of an orientation film means the surface by which the liquid crystal compound orientation layer to which the orientation film transcribe|transfers among the surfaces of an orientation film is intended to be provided. When an oligomer block coat layer, a planarization coat layer, a release layer, etc. are provided, if a liquid crystal compound alignment layer is provided thereon, the surfaces of these oligomer block coat layers, planarization layer, release layer, etc. (the surface in contact with the liquid crystal compound alignment layer) ) is the "release surface" of an oriented film.

In order to lower the surface oligomer precipitation amount, it is preferable to provide a coating layer (hereinafter referred to as an oligomer block coating layer) that blocks precipitation of an oligomer (ester cyclic trimer) on the surface of the transfer orientation film.

It is preferable that the oligomer block coating layer contains 50 weight% or more of resin whose Tg is 90 degreeC or more. As such resin, amino resins, such as a melamine, an alkyd resin, polystyrene, an acrylic resin, etc. are preferable. It is preferable that the upper limit of Tg of resin is 200 degreeC.

The lower limit of the thickness of the oligomer block coating layer is preferably 0.01 µm, more preferably 0.03 µm, still more preferably 0.05 µm. 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 coating layer is preferably 10 µm, more preferably 5 µm, still more preferably 2 µm. When the above is exceeded, the effect may become saturated.

In addition, in order to lower the surface oligomer precipitation amount, it is also preferable to lower the content of the oligomer (ester cyclic trimer) in the polyester resin constituting the release surface side layer of the orientation film for transfer (hereinafter referred to as surface oligomer content). The lower limit of the surface oligomer content is preferably 0.3 mass%, more preferably 0.33 mass%, still more preferably 0.35 mass%. If it is less than the above, it may be difficult to realistically achieve the numerical value. The upper limit of surface oligomer content becomes like this. Preferably it is 0.7 mass %, More preferably, it is 0.6 mass %, More preferably, it is 0.5 mass %. In addition, in this invention, the "release surface side layer" of an orientation film means the layer in which a mold release surface exists among each layer of polyester which comprises an orientation film. Here, even when the film is a single layer, it is sometimes referred to as a release surface side layer. In this case, the back side layer and the release side layer, which will be described later, become the same layer.

In order to lower the surface oligomer content, it is preferable to lower the oligomer content in the raw material polyester. The lower limit of the oligomer content in the raw material polyester is preferably 0.23 mass%, more preferably 0.25 mass%, still more preferably 0.27 mass%. The upper limit of the oligomer content in the raw material polyester is preferably 0.7 mass%, more preferably 0.6 mass%, still more preferably 0.5 mass%. The oligomer content in the raw material polyester can be reduced by heat-treating the polyester in a solid state, such as solid-phase polymerization, at a temperature of 180°C or higher and its melting point or lower. It is also preferable to deactivate the catalyst of the polyester.

Moreover, in order to lower|hang the surface layer oligomer precipitation amount, it is also effective to shorten the melting time at the time of film forming.

The minimum of the haze of the oriented film for transcription|transfer of this invention becomes like this. Preferably it is 0.01 %, More preferably, it is 0.1 %. If it is less than the above, it may be difficult to realistically achieve the numerical value. Moreover, Preferably the upper limit of the haze of the oriented film for transcription|transfer of this invention is 3 %, More preferably, it is 2.5 %, More preferably, it is 2 %, Especially preferably, it is 1.7 %. When the above is exceeded, polarization may be disturbed at the time of polarized UV irradiation, and it may not be possible to obtain a retardation layer or a polarization layer as designed. In addition, light leakage occurs due to diffuse reflection at the time of inspection of the retardation layer or the polarizing layer, making it difficult to inspect.

The lower limit and the upper limit of the haze after heating at 150°C for 90 minutes of the oriented film for transfer of the present invention are the same as described above.

The lower limit of the amount of change of the haze before and after heating at 150°C for 90 minutes of the oriented film for transfer of the present invention is preferably 0%. The upper limit is preferably 0.5%, more preferably 0.4%, still more preferably 0.3%.

The lower limit of the antistatic property (surface resistance) of the oriented film for transfer of the present invention is preferably 1×10 ⁵ Ω/□, more preferably 1×10 ⁶ Ω/□. Even if it is less than the above, the effect is saturated, and the effect further may not be acquired. In addition, the upper limit of the antistatic property (surface resistance) of the oriented film for transfer of the present invention is preferably 1×10 ¹³ Ω/□, more preferably 1×10 ¹² Ω/□, still more preferably 1 ×10 ¹¹ Ω/□. When the above is exceeded, cissing due to static electricity may occur or disturbance of the alignment direction of the liquid crystal compound may occur. Antistatic property (surface resistance) is obtained by mixing an antistatic agent into the oriented film for transfer, providing an antistatic coating layer on the lower layer or opposite surface of the release layer, or adding an antistatic agent to the release layer. , can be within the above range.

Examples of the antistatic agent added to the antistatic coating layer, the release layer, or the transfer orientation film include conductive polymers such as polyaniline and polythiophene, ionic polymers such as polystyrene sulfonate, tin-doped indium oxide, and antimony-doped tin oxide. Electroconductive microparticles|fine-particles are mentioned.

You may provide a mold release layer in the orientation film for transcription|transfer. However, when the film itself has low adhesiveness with a transcription|transfer material, such as a retardation layer and an orientation layer, and there exists sufficient release property even if it does not provide a release layer, it is not necessary to provide a release layer. Moreover, when adhesiveness is too low, you may adjust adhesiveness by performing a corona treatment on the surface, etc. A mold release layer can be formed using a well-known mold release agent, An alkyd resin, an amino resin, a long-chain acrylic acrylate type|system|group, a silicone resin, and a fluororesin are mentioned as a preferable example. These can be suitably selected according to the adhesiveness with a transcription|transfer material.

Moreover, in the orientation film for transcription|transfer of this invention, you may provide an easily adhesive layer as a lower layer of an oligomer block coating layer, an antistatic layer, and a mold release layer.

The lower limit of the intrinsic viscosity (IVf) of the polyester constituting the oriented polyester film for transfer of the present invention is preferably 0.45 dl/g, more preferably 0.5 dl/g, still more preferably 0.53 dl/g to be. If it is less than the above, the impact resistance of the film may be inferior. Moreover, it may become difficult to form into a film, or it may be inferior to the uniformity of thickness. The upper limit of IVf is preferably 0.9 dl/g, more preferably 0.8 dl/g, still more preferably 0.7 dl/g. When it exceeds the above, thermal contraction rate may become high. Moreover, it may become difficult to perform film forming.

Preferably the lower limit of the light transmittance in wavelength 380nm of the orientation film for transcription|transfer of this invention is 0 %. Moreover, Preferably the upper limit of the light transmittance in wavelength 380nm of the orientation film for transcription|transfer of this invention is 20 %, More preferably, it is 15 %, More preferably, it is 10 %, Especially preferably, it is 5 %. When it exceeds the above and it sets it as a specific orientation direction by irradiating a polarization|polarized-light ultraviolet-ray, the direction uniformity of an orientation layer and a liquid crystal compound orientation layer may worsen by reflection from a back surface. The light transmittance at a wavelength of 380 nm can be made within the range by adding a UV absorber.

When the orientation film for transfer of the present invention is a polyethylene terephthalate film, the lower limit of the refractive index nx in the slow axis direction - the refractive index ny in the fast axis direction is preferably 0.005, more preferably 0.01, still more preferably 0.02. , particularly preferably 0.03, and most preferably 0.04. If it is less than the above, it may be difficult to realistically achieve the numerical value. Moreover, Preferably the upper limit of nx-ny is 0.15, More preferably, it is 0.13, More preferably, it is 0.12. If the above is exceeded, it may be difficult to realistically achieve the numerical value.

In the case of biaxial stretching, 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 realistically achieve the numerical value. Moreover, in the case of biaxial stretching, Preferably the upper limit of nx-ny is 0.05, More preferably, it is 0.04, More preferably, it is 0.03. If the above is exceeded, it may be difficult to realistically achieve the numerical value.

In the case of uniaxial stretching, the minimum of nx-ny becomes like this. Preferably it is 0.05, More preferably, it is 0.06. If it is less than the above, the merit of uniaxial stretching may weaken. Moreover, in the case of uniaxial stretching, Preferably the upper limit of nx-ny is 0.15, More preferably, it is 0.13. If the above is exceeded, it may be difficult to realistically achieve the numerical value.

The lower limit of the refractive index (ny) in the fast axis direction of the oriented film for transfer of the present invention is preferably 1.55, more preferably 1.58, still more preferably 1.57. Moreover, Preferably the upper limit of the refractive index (ny) of the fast-axis direction of the orientation film for transcription|transfer of this invention is 1.64, More preferably, it is 1.63, More preferably, it is 1.62.

Preferably the lower limit of the refractive index (nx) of the slow-axis direction of the orientation film for transcription|transfer of this invention is 1.66, More preferably, it is 1.67, More preferably, it is 1.68. Moreover, Preferably the upper limit of the refractive index (nx) of the slow-axis direction of the oriented film for transcription|transfer of this invention is 1.75, More preferably, it is 1.73, More preferably, it is 1.72, Especially preferably, it is 1.71.

(Manufacturing method of oriented film for transfer)

Hereinafter, the manufacturing method of the oriented film for transcription in case the oriented film for transcription of this invention is a stretched film is demonstrated.

When performing MD extending|stretching, it is preferable that the minimum of MD magnification is 1.5 times. The upper limit is preferably 6 times, more preferably 5.5 times, still more preferably 5 times. Moreover, when performing TD extending|stretching, it is preferable that the minimum of TD magnification is 1.5 times. The upper limit of TD magnification becomes like this. Preferably it is 6 times, More preferably, it is 5.5 times, More preferably, it is 5 times.

The lower limit of the HS temperature is preferably 150°C, more preferably 170°C. If it is less than the above, thermal contraction rate may not fall. Moreover, Preferably the upper limit of HS temperature is 240 degreeC, More preferably, it is 230 degreeC. When it exceeds the above, it may become resin deterioration.

The lower limit of the TD relaxation rate is preferably 0.1%, more preferably 0.5%. If it is less than the above, thermal contraction rate may not fall. In addition, the upper limit of the TD relaxation rate is preferably 8%, more preferably 6%, still more preferably 5%. When it exceeds the above, planarity may worsen by sagging, or thickness may become non-uniform|heterogenous.

As for annealing, the method of unwinding a film, passing it through the inside of oven, and winding up is preferable.

The lower limit of the annealing temperature is preferably 80°C, more preferably 90°C, still more preferably 100°C. If it is less than the above, the annealing effect may not be obtained. Moreover, Preferably the upper limit of annealing temperature is 200 degreeC, More preferably, it is 180 degreeC, More preferably, it is 160 degreeC. When it exceeds the above, planarity may fall or thermal contraction may become high.

The lower limit of the annealing time is preferably 5 seconds, more preferably 10 seconds, still more preferably 15 seconds. If it is less than the above, the annealing effect may not be obtained. The upper limit of the annealing time is preferably 10 minutes, more preferably 5 minutes, still more preferably 3 minutes, and particularly preferably 1 minute. When the above is exceeded, not only the effect is saturated, but a large oven is required or productivity may be inferior.

In the annealing treatment, methods such as adjusting the relaxation rate by the circumferential speed difference between the unwinding speed and the winding speed or adjusting the winding tension to adjust the relaxation rate are employed. 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. The upper limit of the relaxation rate is preferably 8%, more preferably 6%, still more preferably 5%. When it exceeds the above, planarity may fall or winding defect may arise.

(Laminate for liquid crystal compound alignment layer transfer)

Next, the laminated body for liquid crystal compound orientation layer transcription|transfer of this invention is demonstrated.

The liquid crystal compound alignment layer transfer laminate of the present invention has a structure in which a liquid crystal compound alignment layer and the transfer alignment film of the present invention are laminated. It is necessary to apply and orientate a liquid crystal compound orientation layer on the orientation film for transcription|transfer. As a method of orientation, a method of imparting an orientation control function by performing a rubbing treatment or the like on the lower layer (release surface) of the liquid crystal compound alignment layer, or a method of directly aligning the liquid crystal compound by irradiating polarized ultraviolet light after application of the liquid crystal compound have.

(Orientation Control Layer)

Moreover, the method of providing an orientation control layer in the orientation film for transcription|transfer and providing a liquid crystal compound orientation layer on this orientation control layer is also preferable. In addition, in this invention, not only liquid crystal compound orientation layer, but also as a generic term which put the orientation control layer and liquid crystal compound orientation layer together, it may call a liquid crystal compound orientation layer. The alignment control layer may be any alignment control layer as long as it can bring the liquid crystal compound alignment layer into a desired alignment state. A rubbing treatment alignment control layer obtained by rubbing a resin coating film, or a polarized light irradiation to align molecules A suitable example is a photo-alignment control layer that causes an alignment function to occur.

(Rubbing treatment orientation control layer)

As a polymer material used for the orientation control layer formed by the rubbing process, polyvinyl alcohol and its derivative(s), polyimide and its derivative(s), an acrylic resin, polysiloxane derivative, etc. are used preferably.

Hereinafter, the formation method of a rubbing process orientation control layer is demonstrated. First, after apply|coating the rubbing process orientation control layer coating liquid containing the said polymer material on the release surface of an orientation film, heat-drying etc. are performed, and the orientation control layer before a rubbing process is obtained. The orientation control layer coating liquid may have a crosslinking agent.

As a solvent for the rubbing treatment orientation control layer coating liquid, any solvent that dissolves a polymer material can be used without any limitation. Specific examples 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; ketone solvents such as acetone, methyl ethyl ketone, cyclopentanone, and cyclohexanone; aromatic hydrocarbon solvents such as toluene or xylene; Ether solvents, such as tetrahydrofuran or dimethoxyethane, etc. are mentioned. These solvents may be used independently and may be combined.

The concentration of the rubbing treatment orientation-controlling layer coating liquid can be appropriately adjusted depending on the type of polymer or the thickness of the orientation-controlling layer to be produced. % is particularly preferred. As a coating method, well-known methods, such as a coating method, 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 flexographic method, are employ|adopted.

Although heat-drying temperature also depends on the orientation film for transcription|transfer, in the case of PET, the range of 30 degreeC - 170 degreeC is preferable, More preferably, it is 50-150 degreeC, More preferably, it is 70-130 degreeC. When the drying temperature is low, it is necessary to take a long drying time, and productivity may be inferior. When drying temperature is too high, the orientation film for transcription|transfer may stretch with a heat|fever, or heat contraction may become large, and it may become impossible to achieve the optical function as designed, or planarity may worsen. The heat drying time may be, for example, 0.5 to 30 minutes, more preferably 1 to 20 minutes, and more preferably 2 to 10 minutes.

It is preferable that the thickness of a rubbing process orientation control layer is 0.01-10 micrometers, Furthermore, it is 0.05-5 micrometers, It is preferable that it is especially 0.1 micrometer - 1 micrometer.

Next, a rubbing process is performed. A rubbing process can generally be performed by rubbing the surface of a polymer layer in a fixed direction with paper or cloth. In general, the surface of the orientation control layer is subjected to a rubbing treatment using a rubbing roller made of raised fabrics of fibers such as nylon, polyester, and acrylic. In order to provide a liquid crystal compound orientation control layer oriented in a predetermined direction oblique to the longitudinal direction of a long film, the rubbing direction of the orientation control layer must also be set at an angle corresponding thereto. Adjustment of an angle can be matched by adjustment of the angle of a rubbing roller and an orientation film, the conveyance speed of an orientation film, and adjustment of the rotation speed of a roller.

It is also possible to directly rub the release surface of the oriented film for transfer to have an orientation control function on the surface of the oriented film for transfer, and this case is also included in the technical scope of the present invention.

(optical orientation control layer)

The photo-alignment control layer is an alignment film to which an alignment control force is imparted by applying a coating solution containing a polymer or a monomer having a photoreactive group and a solvent to an alignment film, and irradiating polarized light, preferably polarized ultraviolet light. A photoreactive group means group which produces liquid-crystal orientation ability by light irradiation. Specifically, alignment induction or isomerization reaction, dimerization reaction, photocrosslinking reaction, or photolysis reaction of molecules generated by irradiation with light, which is the origin of liquid crystal alignment ability to cause a photoreaction. Among the photoreactive groups, those that cause dimerization reaction or photocrosslinking reaction are preferred in terms of excellent alignment properties and maintaining the smectic liquid crystal state of the liquid crystal compound alignment layer. The photoreactive group capable of generating the above reaction is preferably an unsaturated bond, particularly a double bond, and at least selected from the group consisting of C = C bond, C = N bond, N = N bond, and C = O bond. Groups having one are particularly preferred.

Examples of the photoreactive group having a C═C bond include a vinyl group, a polyene group, a stilbene group, a stilbazole group, a stilbazolium group, a chalcone group, and a cinnamoyl group. Examples of the photoreactive group having a C═N bond include a group having a structure such as an aromatic Cifu base and an aromatic hydrazone. Examples of the photoreactive group having an N=N bond include an azobenzene group, an azonaphthalene group, an aromatic heterocyclic azo group, a bisazo group and a formazan group, and those having azoxybenzene as a basic structure. Examples of the photoreactive group having a C═O bond include a benzophenone group, a coumarin group, an anthraquinone group, and a maleimide group. These groups may have a substituent such as an alkyl group, an alkoxy group, an aryl group, an allyloxy group, a cyano group, an alkoxycarbonyl group, a hydroxyl group, a sulfonic acid group, and a halogenated alkyl group.

Among them, a photoreactive group capable of causing a photodimerization reaction is preferable, a cinnamoyl group and a chalcone group, a photo-alignment layer having a relatively small amount of polarization irradiation required for photo-alignment, and excellent thermal stability and stability over time Since it is easy to obtain, it is preferable. Incidentally, as the polymer having a photoreactive group, one having a cinnamoyl group such that the terminal portion of the polymer side chain has a cinnamic acid structure is particularly preferable. As a structure of a main chain, polyimide, polyamide, (meth)acryl, polyester, etc. are mentioned.

As a specific orientation control layer, Unexamined-Japanese-Patent No. 2006-285197, Unexamined-Japanese-Patent No. 2007-76839, Unexamined-Japanese-Patent No. 2007-138138, Unexamined-Japanese-Patent No. 2007-94071, Japanese Unexamined-Japanese-Patent No. 2007-121721, Japanese Patent Laid-Open No. 2007-140465, Japanese Patent Laid-Open No. 2007-156439, Japanese Patent Application Laid-Open No. 2007-133184, Japanese Patent Laid-Open No. 2009-109831, Japanese Patent Laid-Open No. 2002-229039 , Japanese Patent Application Laid-Open No. 2002-265541, Japanese Patent Application Laid-Open No. 2002-317013, Japanese Patent Publication No. 2003-520878, Japanese Patent Publication No. 2004-529220, Japanese Unexamined Patent Application Publication No. 2013-33248, Japanese Unexamined Patent Application Publication No. 2015 -7702 and the orientation control layer of Unexamined-Japanese-Patent No. 2015-129210 are mentioned.

As a solvent for the coating solution for forming the photo-alignment control layer, any solvent that dissolves a polymer and a monomer having a photoreactive group can be used without limitation. As a specific example, what is mentioned in the formation method of a rubbing process orientation control layer can be illustrated. It is also preferable to add a photoinitiator, a polymerization inhibitor, and various stabilizers to the coating liquid for photo-alignment control layer formation. Moreover, you may add the monomer which does not have a photoreactive group copolymerizable with the monomer which has a photoreactive group, and a polymer other than the polymer and monomer which has a photoreactive group.

The concentration of the coating liquid for forming the photo-orientation control layer, the coating method, and the drying conditions can also be exemplified by those cited in the method for forming the rubbing treatment orientation-controlling layer. The thickness is also the same as the preferred thickness of the rubbing treatment orientation control layer.

It is preferable to irradiate polarized light from the direction of the photo-alignment control layer surface before orientation. When making the orientation direction of a photo-orientation control layer parallel or perpendicular|vertical with respect to the orientation direction of the orientation film for transcription|transfer, you may permeate|transmit the orientation film for transcription|transfer and you may irradiate.

The wavelength of the polarized light is preferably in a wavelength range in which the photoreactive group of the polymer or monomer having a photoreactive group can absorb light energy. Specifically, ultraviolet rays having a wavelength of 250 to 400 nm are preferable. Examples of the light source of polarized light include xenon lamps, high-pressure mercury lamps, ultra-high pressure mercury lamps, metal halide lamps, and ultraviolet light lasers such as KrF and ArF, and high-pressure mercury lamps, ultra-high pressure mercury lamps and metal halide lamps are preferable.

Polarized light can be obtained by, for example, passing a polarizer through the light from the light source. By adjusting the polarization angle of the polarizer, the direction of polarization can be adjusted. Examples of the polarizer include a polarizing filter, a polarizing prism such as Glan Thompson and Glan Taylor, and a wire grid type polarizer. Polarized light is preferably substantially parallel light.

By adjusting the angle of the polarized light to be irradiated, the direction of the orientation regulating force of the optical orientation control layer can be arbitrarily adjusted.

Although irradiation intensity changes with the kind and quantity of a polymerization initiator and resin (monomer), for example, 10-10000 mJ/cm<2> is preferable based on 365 nm, Furthermore, 20-5000 mJ/cm<2> is preferable.

(Liquid crystal compound alignment layer)

The liquid crystal compound alignment layer will not have a restriction|limiting in particular, if a liquid crystal compound is orientated. Specific examples include a polarizing film (polarizer) containing a liquid crystal compound and a dichroic dye, and a retardation layer containing a rod shape and a discotic liquid crystal compound.

(polarizing film)

The polarizing film has a function of passing polarized light in only one direction, and contains a dichroic dye.

(dichroic pigment)

The dichroic dye refers to a dye having a property in which the absorbance in the long-axis direction of the molecule differs from the absorbance in the short-axis direction.

It is preferable that a dichroic dye has an absorption maximum wavelength (λMAX) in the range of 300-700 nm. Although an acridine dye, an oxazine dye, a cyanine dye, a naphthalene dye, an azo dye, an anthraquinone dye, etc. are mentioned, for example, as for such a dichroic dye, an azo dye is especially preferable. A monoazo dye, a bisazo dye, a trisazo dye, a tetrakis azo dye, a stilbenazo dye, etc. are mentioned as an azo dye, Preferably they are a bisazo dye and a trisazo dye. Although individual or a dichroic dye may be combined, in order to adjust color tone (in an achromatic color), it is preferable to combine 2 or more types. It is especially preferable to combine three or more types. In particular, it is preferable to combine three or more types of azo compounds.

As a preferable azo compound, the pigment|dye of Unexamined-Japanese-Patent No. 2007-126628, Unexamined-Japanese-Patent No. 2010-168570, Unexamined-Japanese-Patent No. 2013-101328, and Unexamined-Japanese-Patent No. 2013-210624 is mentioned.

It is also preferable that the dichroic dye is a dichroic dye polymer introduce|transduced into the side chain of polymers, such as acryl. Examples of these dichroic dye polymers include polymers exemplified in Japanese Patent Application Laid-Open No. 2016-4055, and polymers obtained by polymerization of compounds of [Formula 6] to [Formula 12] of Japanese Patent Application Laid-Open No. 2014-206682.

From a viewpoint of making the orientation of a dichroic dye favorable, 0.1-30 mass % is preferable in a polarizing film, as for content of the dichroic dye in a polarizing film, 0.5-20 mass % is more preferable, 1.0-15 mass % is more preferable, and 2.0-10 mass % is especially preferable.

The polarizing film preferably further contains a polymerizable liquid crystal compound in order to improve film strength, polarization degree, and film homogeneity. Here, the polymerizable liquid crystal compound includes a film after polymerization.

(Polymerizable liquid crystal compound)

A polymerizable liquid crystal compound is a compound which has a polymeric group and shows liquid crystallinity.

A polymerizable group means group which participates in a polymerization reaction, and it is preferable that it is a photopolymerizable group. Here, the photopolymerizable group refers to a group capable of polymerization reaction with an active radical, acid, or the like generated from a photopolymerization initiator described later. Examples of the polymerizable group include a vinyl group, a vinyloxy group, a 1-chlorovinyl group, an isopropenyl group, a 4-vinylphenyl group, an acryloyloxy group, a methacryloyloxy group, an oxiranyl group, and an 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 higher order smectic liquid crystal compound, from the viewpoint that higher polarization properties can be obtained. If 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 alignment order can be produced.

As a specific preferable polymeric liquid crystal compound, Unexamined-Japanese-Patent No. 2002-308832, Unexamined-Japanese-Patent No. 2007-16207, Unexamined-Japanese-Patent No. 2015-163596, Unexamined-Japanese-Patent No. 2007-510946, Japan, for example. Korean Patent Application Laid-Open No. 2013-114131, International Publication No. WO2005/045485, Lub et al. Recl. Trav. Chim. Pays-Bas, 115, 321-328 (1996), etc. are mentioned.

The content of the polymerizable liquid crystal compound in the polarizing film is preferably 70 to 99.5 mass% in the polarizing film, more preferably 75 to 99 mass%, further preferably from the viewpoint of improving the orientation of the polymerizable liquid crystal compound. It is 80-97 mass %, Especially preferably, it is 83-95 mass %.

The polarizing film can be installed by coating the polarizing film composition paint. The polarizing film composition coating material may contain a solvent, a polymerization initiator, a sensitizer, a polymerization inhibitor, a leveling agent, and a polymerizable non-liquid crystal compound, a crosslinking agent, etc.

As a solvent, what was mentioned as a solvent of an orientation layer coating liquid is used preferably.

Although limitation will not be carried out as long as a polymerization initiator polymerizes a polymerizable liquid crystal compound, A photoinitiator which generate|occur|produces an active radical with light is preferable. Examples of the polymerization initiator include a benzoin compound, a benzophenone compound, an alkylphenone compound, an acylphosphine oxide compound, a triazine compound, an iodonium salt, and a sulfonium salt.

As for the sensitizer, a photosensitizer is preferable. For example, a xanthone compound, an anthracene compound, phenothiazine, rubrene, etc. are mentioned.

Hydroquinones, catechols, and thiophenols are mentioned as a polymerization inhibitor.

As a polymerizable non-liquid crystal compound, it is preferable to copolymerize with a polymeric liquid crystal compound, For example, when a polymeric liquid crystal compound has a (meth)acryloyloxy group, (meth)acrylates are mentioned. (meth)acrylates may be monofunctional or polyfunctional may be sufficient as them. By using polyfunctional (meth)acrylates, the intensity|strength of a polarizing film can be improved. When using a polymerizable non-liquid crystal compound, it is preferable to set it as 1-15 mass % in a polarizing film, Furthermore, it is 2-10 mass %, It is especially preferable to set it as 3-7 mass %. When it exceeds 15 mass %, a polarization degree may fall.

As a crosslinking agent, the compound which can react with the functional group of a polymeric liquid crystal compound and a polymerizable non-liquid crystal compound is mentioned, An isocyanate compound, a melamine, an epoxy resin, an oxazoline compound, etc. are mentioned.

A polarizing film is provided by directly coating a polarizing film composition coating material on the orientation film for transcription|transfer or on an orientation control layer, and drying, heating, and hardening as needed.

As a coating method, well-known methods, such as a coating method, such as a gravure coating method, the die-coating method, the bar coating method, and the applicator method, and the printing method, such as a flexographic method, are employ|adopted.

The oriented film for transfer after coating is guided by a warm air dryer, an infrared dryer, etc., and dried at 30 to 170°C, more preferably 50 to 150°C, still more preferably 70 to 130°C. 0.5 to 30 minutes are preferable, as for drying time, 1 to 20 minutes are more preferable, Furthermore, 2 to 10 minutes are more preferable.

Heating can be performed in order to orientate the dichroic dye and a polymeric liquid crystal compound in a polarizing film more firmly. It is preferable to make heating temperature into the temperature range in which a polymeric liquid crystal compound forms a liquid crystal phase.

When a polymerizable liquid crystal compound is contained in a polarizing film composition coating material, it is preferable to harden|cure it. Heating and light irradiation are mentioned as a hardening method, Light irradiation is preferable. It can be fixed in the state which orientated a dichroic dye by hardening. It is preferable to perform hardening in the state which formed the liquid crystal phase in the polymeric liquid crystal compound, and you may harden|cure by light irradiation at the temperature which shows a liquid crystal phase. As light in light irradiation, a visible light, an ultraviolet light, and a laser beam are mentioned. From the point of handling easiness, an ultraviolet light is preferable.

Although irradiation intensity changes with the kind and quantity of a polymerization initiator and resin (monomer), for example, 100-10000 mJ/cm<2> is preferable based on 365 nm, Furthermore, 200-5000 mJ/cm<2> is preferable.

In the polarizing film, by applying the polarizing film composition paint on the orientation controlling layer, the dye is oriented along the orientation direction of the orientation layer, and as a result, it has a polarization transmission axis in a predetermined direction, but for direct transfer without providing an orientation controlling layer When coating to an orientation film, a polarizing film can also be orientated by irradiating polarized light and hardening the composition for polarizing film formation. At this time, the polarized light of a desired direction (for example, the polarized light of an oblique direction) is irradiated with respect to the long direction of the orientation film for transcription|transfer. Moreover, it is preferable to orientate a dichroic dye firmly along the orientation direction of a polymeric liquid crystal by heat-processing after that.

The thickness of a polarizing film is 0.1-5 micrometers, Preferably it is 0.3-3 micrometers, More preferably, it is 0.5-2 micrometers.

(retardation layer)

The retardation layer is provided for optical compensation between the polarizer of the liquid crystal display device and the liquid crystal cell, and typical examples include a λ/4 layer, a λ/2 layer, and the like of a circular polarizing plate. As a liquid crystal compound, a rod-shaped liquid crystal compound, a discotic liquid crystal compound, etc. can be used according to the objective, such as a positive or negative A plate, a positive or negative C plate, and an O plate.

When used as optical compensation of a liquid crystal display device, the degree of phase difference is suitably set according to the type of a liquid crystal cell, and the property of the liquid crystal compound used for a cell. For example, in the case of the TN system, an O plate using discotic liquid crystal is preferably used. In the case of the VA system or the IPS system, a C plate or A plate using a rod-shaped liquid crystal compound or a discotic liquid crystal compound is preferably used. Moreover, in the case of a λ/4 retardation layer and a λ/2 retardation layer of a circularly polarizing plate, using a rod-like compound to form an A plate is preferably used. These retardation layers may be used not only as a single layer but as a plurality of layers in combination.

As a liquid crystal compound used for these retardation layers, it is preferable that it is a polymeric liquid crystal compound which has polymeric groups, such as a double bond, from the point that an orientation state can be fixed.

Examples of the rod-like liquid crystal compound include Japanese Patent Application Laid-Open No. 2002-030042, Japanese Patent Application Laid-Open No. 2004-204190, Japanese Patent Application Laid-Open No. 2005-263789, Japanese Patent Application Laid-Open No. 2007-119415, and Japanese Patent Application Laid-Open No. 2007-186430 and a rod-shaped liquid crystal compound having a polymerizable group described in Japanese Patent Application Laid-Open No. Hei 11-513360.

As a specific compound,

CH ₂ =CHCOO-(CH ₂ )mO-Ph1-COO-Ph2-OCO-Ph1-O-(CH ₂ )n-OCO-CH=CH ₂

CH ₂ =CHCOO-(CH ₂ )mO-Ph1-COO-NPh-OCO-Ph1-O-(CH ₂ )n-OCO-CH=CH ₂

CH ₂ =CHCOO-(CH ₂ )mO-Ph1-COO-Ph2-OCH ₃

CH ₂ =CHCOO-(CH ₂ )mO-Ph1-COO-Ph1-Ph1-CH ₂ CH(CH ₃ )C ₂ H ₅

(wherein m and n are integers of 2 to 6,

Ph1 and Ph2 are 1,4-phenyl groups (Ph2 may be a methyl group at the 2nd position),

NPh is a 2,6-naphthyl group.);

These rod-shaped liquid crystal compounds are marketed as LC242 etc. by the BASF company, and they can be used.

You may use these rod-shaped liquid crystal compounds combining multiple types by arbitrary ratios.

Moreover, as a discotic liquid crystal compound, a benzene derivative, a truxene derivative, a cyclohexane derivative, an azacrown type|system|group, a phenylacetylene type macrocycle, etc. are mentioned, Unexamined-Japanese-Patent No. 2001-155866, various things are described, These are suitably used.

Among them, as the discotic compound, a compound having a triphenylene ring represented by the following general formula (1) is preferably used.

In the formula, R ₁ to _{R 6} are each independently hydrogen, halogen, an alkyl group or a group represented by -OX (wherein X is an alkyl group, an acyl group, an alkoxybenzyl group, an epoxy-modified alkoxybenzyl group, or an acryloyloxy-modified group) an alkoxybenzyl group or an acryloyloxy-modified alkyl group). It is preferable that R<_{1> -R<6>} is an acryloyloxy modified|denatured alkoxybenzyl group (here, m is 4-10) represented by following General formula (2).

The retardation layer can be provided by coating the composition coating material for the retardation layer. The composition coating material for retardation layers may also contain a solvent, a polymerization initiator, a sensitizer, a polymerization inhibitor, a leveling agent, and a polymerizable non-liquid crystal compound, a crosslinking agent, etc. As these, what was demonstrated in the part of an orientation control layer and a liquid crystal polarizer can be used.

After coating the composition coating material for retardation layer on the release surface or orientation control layer of an orientation film, a retardation layer is provided by drying, heating, and hardening.

As for these conditions, the conditions demonstrated in the part of an orientation control layer and a liquid crystal polarizer are used as preferable conditions.

A plurality of retardation layers may be provided, but in this case, a plurality of retardation layers may be provided on one oriented film for transfer and transferred to an object, and a single retardation layer may be provided on one oriented film for transfer. You may prepare two or more types of thing and transcribe|transfer these to an object one by one.

Moreover, a polarizing layer and retardation layer may be provided on one oriented film for transcription|transfer, and you may transcribe|transfer this to a target object. Moreover, a protective layer may be provided between a polarizer and a retardation layer, or a protective layer may be provided above a retardation layer or between retardation layers. These protective layers may also be provided on the orientation film for transcription|transfer together with a retardation layer and a polarizing layer, and you may transfer to a target object.

As a protective layer, the coating layer of transparent resin is mentioned. The transparent resin is not particularly limited, such as polyvinyl alcohol, ethylene vinyl alcohol copolymer, polyester, polyurethane, polyamide, polystyrene, acrylic resin, or epoxy resin. A crosslinking agent may be added to these resins to form a crosslinked structure. Moreover, what hardened|cured photocurable compositions, such as acrylic, like a hard coat, may be used. Moreover, after providing a protective layer on an orientation film, you may rub a protective layer and provide a liquid crystal compound orientation layer without providing an orientation layer on it.

(Manufacturing method of liquid crystal compound alignment layer laminated polarizing plate)

Next, the manufacturing method of the liquid crystal compound alignment layer laminated|multilayer polarizing plate of this invention is demonstrated.

The manufacturing method of the liquid crystal compound alignment layer laminated polarizing plate of this invention is the process of bonding a polarizing plate and the liquid crystal compound alignment layer surface of the liquid crystal compound alignment layer transcription|transfer laminated body of this invention to form an intermediate|middle laminated body, and an orientation film from an intermediate laminated body Including the step of peeling.

Hereinafter, the case where a liquid crystal compound alignment layer is a liquid crystal compound alignment layer used for a circularly polarizing plate is demonstrated as an example. In the case of a circularly polarizing plate, a λ/4 layer is used as the retardation layer (in the transfer laminate, it is called a liquid crystal compound alignment layer). The front retardation of the λ/4 layer is preferably 100 to 180 nm. More preferably, it is 120-150 nm. When only the λ/4 layer is used as the circular polarizing plate, the orientation axis (slow axis) of the λ/4 layer and the transmission axis of the polarizer are preferably 35 to 55 degrees, more preferably 40 to 50 degrees, still more preferably 42 to It is 48 degrees. When using in combination with the polarizer of a stretched film of polyvinyl alcohol, the absorption axis of the polarizer is generally in the longitudinal direction of the long polarizer film. It is preferable to orientate a liquid crystal compound so that it may become the said range with respect to the longitudinal direction of the orientation film for transcription|transfer. In addition, when the angle of the transmission axis of the polarizer is different from the above, the liquid crystal compound is oriented so that the above relation is obtained by adding the angle of the transmission axis of the polarizer.

A circularly polarizing plate is created by transcribe|transferring the (lambda)/4 layer in the laminated body for transcription|transfer in which the (lambda)/4 layer and the orientation film were laminated|stacked on the polarizing plate. Specifically, the polarizing plate and the λ/4 layer surface of the transfer laminate are bonded to form an intermediate laminate, and the oriented film is peeled from the intermediate laminate. Although the protective film provided on both surfaces of a polarizer may be sufficient as a polarizing plate, it is preferable that the protective film is provided only on one side. If it is a polarizing plate in which the protective film is provided only on one side, it is preferable to bond retardation layer to the opposite surface (polarizing surface) of a protective film. As long as the protective film is provided on both surfaces, it is preferable to bond the retardation layer to the surface supposing the image cell side. The surface assuming the image cell side is a surface that is not subjected to surface processing, such as a low-reflection layer, an anti-reflection layer, and an anti-glare layer, which is generally provided on the viewing side. The protective film of the side to which retardation layer is pasted is TAC, an acryl, COP, etc., and it is preferable that it is a protective film without retardation.

As a polarizer, a polarizer prepared by stretching a PVA-based film alone, a polarizer prepared by coating PVA on an unstretched substrate such as polyester or polypropylene, and stretching the entire substrate is transferred to a polarizer protective film, or a liquid crystal compound The thing which coated or transcribe|transferred the polarizer which consists of a dichroic dye to a polarizer protective film is mentioned, All are used preferably.

As a method of affixing, conventionally known things, such as an adhesive agent and an adhesive, can be used. As the adhesive, a polyvinyl alcohol-based adhesive, an ultraviolet curable adhesive such as acrylic or epoxy, or a thermosetting adhesive such as an epoxy or isocyanate (urethane) is preferably used. As an adhesive, adhesives, such as an acryl, a urethane type, and a rubber type, are mentioned. Moreover, it is also preferable to use the transparent adhesive sheet for optics without an acrylic base material.

When using a transfer type thing as a polarizer, you may transcribe|transfer a polarizer on the retardation layer (liquid crystal compound orientation layer) of the laminated body for transcription|transfer, and then you may transcribe|transfer a polarizer and retardation layer to a target object (polarizer protective film).

As a polarizer protective film on the side opposite to the side on which the retardation layer is provided, a thing generally known, such as TAC, acryl, COP, polycarbonate, and polyester, can be used. Among them, TAC, acrylic, COP and polyester are preferable. Polyester is preferably polyethylene terephthalate. In the case of polyester, it is preferable that it is a zero retardation film of 100 nm or less of in-plane retardation, especially 50 nm or less, or it is a 3000 nm-30000 nm high retardation film.

When using a high retardation film, for the purpose of preventing blackout or coloring when viewing an image while wearing polarized sunglasses, the angle between the transmission axis of the polarizer and the slow axis of the high retardation film is preferably in the range of 30 to 60 degrees, Furthermore, the range of 35-55 degree|times is preferable. In order to reduce iridescence and the like when observed from an oblique direction with a shallow angle with the naked eye, the angle between the transmission axis of the polarizer and the slow axis of the retardation film is 10 degrees or less, and further 7 degrees or less, Or 80-100 degree|times, Furthermore, it is preferable to set it as 83-97 degree|times.

An anti-glare layer, an antireflection layer, a low reflection layer, a hard coat layer, etc. may be provided in the polarizer protective film on the opposite side.

(Composite retardation layer)

When the λ/4 layer is used alone, it may not become λ/4 over a wide range of the visible light region and coloration may occur. Therefore, the λ/4 layer may be used in combination with the λ/2 layer. The front retardation of the λ/2 layer is preferably 200 to 360 nm. More preferably, it is 240-300 nm.

In this case, it is preferable that the λ/4 layer and the λ/2 layer are arranged at the same angle as λ/4. Specifically, the angle (θ) between the orientation axis (slow axis) of the λ/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 λ/2 layer and the orientation axis (slow axis) of the λ/4 layer is preferably in the range of 2θ+45°±10°, more preferably in the range of 2θ+45°±5°, still more preferably Usually, it is in the range of 2θ + 45 degrees ± 3 degrees.

Also in this case, when used in combination with the polarizer of a stretched film of polyvinyl alcohol, since the absorption axis of the polarizer is generally in the longitudinal direction of the long polarizer film, a λ/2 layer or λ/ When providing four layers, it is preferable to orientate a liquid crystal compound so that it may become the said range with respect to the longitudinal direction of a long orientation film for transcription|transfer or the perpendicular|vertical direction of length. In addition, when the angle of the transmission axis of the polarizer is different from the above, the liquid crystal compound is oriented so that the above relation is obtained by adding the angle of the transmission axis of the polarizer.

As an example of such a method or a retardation layer, Japanese Patent Application Laid-Open No. 2008-149577, Japanese Patent Application Laid-Open No. 2002-303722, International Publication No. WO2006/100830, Japanese Patent Application Laid-Open No. 2015-64418, etc. can be referred to. have.

Moreover, it is also a preferable form to provide a C plate layer on the (lambda)/4 layer in order to reduce the change of coloration etc. in the case of oblique view. As the C plate layer, a positive or negative C plate layer is used according to the characteristics of the λ/4 layer or the λ/2 layer.

These lamination methods include, for example, a combination of a λ/4 layer and a λ/2 layer,

A λ/2 layer is provided on the polarizer by transfer, and a λ/4 layer is further provided thereon by transfer.

- A λ/4 layer and a λ/2 layer are provided in this order on the oriented film for transfer, and this is transcribed on a polarizer.

- A λ/4 layer, a λ/2 layer, and a polarizing layer are provided in this order on the oriented film for transfer, and this is transferred to an object.

Various methods, such as providing a λ/2 layer and a polarizing layer in this order on the orientation film for transfer, transferring this to an object, and further transferring the λ/4 layer thereon, can be adopted.

Also, in the case of laminating the C plate, a method of transferring the C plate layer on the λ/4 layer provided on the polarizer, or a method of providing a C plate layer on an orientation film, and further adding a λ/4 layer or λ/ Various methods such as a method of providing two layers and a λ/4 layer and transferring them can be adopted.

It is preferable that the thickness of the circularly polarizing plate obtained in this way is 120 micrometers or less. More preferably, it is 100 micrometers or less, Furthermore, 90 micrometers or less are preferable, Especially 80 micrometers or less are preferable, Most preferably, it is 70 micrometers or less.

(Inspection method 1 of laminate for liquid crystal compound alignment layer transfer)

Next, the inspection method of the laminated body for liquid crystal compound orientation layer transcription|transfer of this invention is demonstrated.

The inspection method of the liquid crystal compound alignment layer transfer laminate of the present invention is parallel to the alignment direction of the alignment film, or in a direction perpendicular to the alignment direction, or in the flow direction of the alignment film, or in a direction orthogonal to the flow direction. It includes a step of irradiating linearly polarized light having an electric field vibration direction from the alignment film surface of the laminate, receiving light from the liquid crystal compound alignment layer surface side, and a step of inspecting whether the received light has a quenched state. As described above, in the present invention, in the liquid crystal compound alignment layer transfer laminate, the transfer alignment film has birefringence, and even if the liquid crystal compound alignment layer is a retardation layer, the optical properties are inspected in a state in which the liquid crystal compound alignment layer is laminated on the transfer alignment film. can do.

In order to inspect the optical state of the retardation layer, linearly polarized light parallel or perpendicular to the orientation direction of the orientation film for transfer is irradiated, and a change in the polarization state is detected by a light receiver provided on the opposite surface of the laminate. Parallel to the orientation direction of the oriented film for transfer is preferably -10 to +10 degrees, more preferably -7 to 7 degrees, still more preferably -5 to 5 degrees, particularly preferably -3 to 3 degrees, most Preferably, it is -2 to 2 degrees. The perpendicularity to the orientation direction of the oriented film for transfer is preferably 80 to 100 degrees, more preferably 83 to 97 degrees, still more preferably 85 to 95 degrees, particularly preferably 87 to 93 degrees, and most preferably 88 degrees. -92 degrees. When it exceeds the above range, the polarized light that strikes the retardation layer or the polarized light that has passed through is affected by the retardation of the base material and is disturbed, and accurate evaluation may not be possible.

Moreover, according to the orientation direction of the orientation film for transcription|transfer, although you may adjust the angle of the linearly polarized light irradiated each time, a test|inspection becomes complicated. Therefore, it is also preferable to fix and test|inspect the linearly polarized light to irradiate as parallel or perpendicular|vertical with respect to the flow direction of the orientation film for transcription|transfer. Here, the range of parallel or vertical is the same as above.

Moreover, when the oriented film for transcription|transfer does not have birefringence, it is preferable to irradiate and test|inspect parallel or perpendicular linearly polarized light with respect to the flow direction (MD direction) of the oriented film for transcription. Here, the range of parallel or vertical is the same as above.

It is preferable to provide a polarizing filter between a light-receiving group and the laminated body for liquid crystal compound orientation layer (retardation layer) transcription|transfer (inspection object film). In addition, between the liquid crystal compound alignment layer (retardation layer) transfer laminate and the polarizing filter, the light that became elliptically polarized by the retardation layer of the liquid crystal compound alignment layer (retardation layer) transfer laminate is elliptically polarized as designed. In the case of , it is preferable to install a retardation plate for converting to linearly polarized light. For example, with such a configuration, when the retardation layer is as designed, the light detected by the light receiver is in the extinguished state, but when there is light leakage, it can be seen that the retardation layer is out of design. It is also possible to provide a plurality of types of light receivers having slightly different angles and phase differences between the angle of the polarizing filter to be installed and the retardation plate, and it is also possible to detect in which direction the phase difference and the orientation direction of the retardation layer are shifted by how much. Moreover, when the phase difference layer has a fault in the microregion by a pinhole or a flaw, it can detect as a luminescent point.

(Inspection method 2 of laminate for liquid crystal compound alignment layer transfer)

Since there also exists another method about the inspection method of the laminated body for liquid crystal compound orientation layer transcription|transfer of this invention, this inspection method is demonstrated.

By another method, elliptically polarized light is irradiated from the retardation layer surface of the laminated body for liquid crystal compound orientation layer (retardation layer) transcription|transfer, and light is received by the orientation film surface side. The elliptically polarized light to be irradiated is elliptically polarized light that is converted into linearly polarized light when the retardation layer of the laminate is as designed. It is preferable that such elliptically polarized light emits linearly polarized light and converts it by a retardation plate.

The direction of the emitted linearly polarized light is the same as that described in the inspection method 1.

The linearly polarized light converted by the retardation layer of the laminated body passes through the oriented film as it is linearly polarized light, without being disturbed by the retardation of the oriented film. It is preferable to provide a polarizing filter between a light-receiving group and the laminated body for liquid crystal compound orientation layer (retardation layer) transcription|transfer (inspection object film). It is preferable to make a polarizing filter into the direction which the linearly polarized light which has passed cannot transmit.

For example, even if it sets it as the above structure, similarly to the test|inspection method 1, the fault or shift|offset|difference of a phase difference layer can be detected.

(Inspection method 3 of laminate for liquid crystal compound alignment layer transfer)

In the above two inspection methods, the light source and the light receiver are installed on both sides with the liquid crystal compound alignment layer transfer laminate interposed therebetween, but the light source and the light receiver are installed on the same side, and a mirror reflector is installed on the opposite side. Since the test can also be performed by this method, this method will be described.

In this method, linearly polarized light is irradiated from the orientation film surface of the laminated body for liquid crystal compound orientation layer transcription|transfer. The direction of the linearly polarized light to be irradiated is the same as that described in the inspection method 1.

For example, light converted into circularly polarized light in the liquid crystal compound alignment layer is reflected by a specular reflection plate provided on the surface opposite to the light source, and returned to the laminate in the state of circularly polarized light. And after being converted back into linearly polarized light again by the liquid crystal compound orientation layer of a laminated body, it transmits through an orientation film and receives light. All the light passing through an oriented film is linearly polarized light, and by setting it as the said angle, without being disturbed by the retardation of an oriented film, it passes through an oriented film as it is linearly polarized light.

It is preferable to provide a polarizing filter between the light receiver and the film to be inspected. It is preferable to make a polarizing filter into the direction which the reflected linearly polarized light cannot transmit.

As the specular reflector, those used as optical surface mirrors, such as a metal plate, metal vapor deposition glass, and metal vapor deposition resin plate, can be used.

A retardation plate may be provided between the inspection object film and the specular reflection plate. When the liquid crystal compound alignment layer is a λ/4 retardation layer or a λ/2 retardation layer, a retardation plate is not necessarily required, but as in method 1, a retardation plate having a slight retardation is provided, and the retardation of the liquid crystal compound alignment layer is You may make it possible to see how it deviated from the design.

When the liquid crystal compound alignment layer is not the λ/4 retardation layer or the λ/2 retardation layer, linearly polarized light passes through the liquid crystal compound alignment layer-retardation plate-specular reflector-retardation plate-liquid crystal compound alignment layer. It is preferable to provide a retardation plate such as to return to polarized light.

(Inspection of polarization layer)

When the liquid crystal compound alignment layer is a polarizing layer, the polarizing layer can be inspected by irradiating natural light (unpolarized light) and receiving the transmitted light through a polarizing filter. Moreover, it can test|inspect by irradiating the light used as linearly polarized light through a polarizing filter to the laminated body for transcription|transfer, and receiving the transmitted light. In this case, the polarizing filter is set at an angle to extinguish when the polarizing layer provided on the transfer orientation film is as designed.

In addition, it is also possible to provide a plurality of types of light receivers having slightly different angles of the polarizing filters, and to detect in which direction the orientation direction is shifted by how much.

Moreover, in such a case, when irradiating said natural light from the oriented film surface side for transcription|transfer, when irradiating the latter linearly polarized light, it is preferable to irradiate from a polarizing layer surface.

The inspection of the polarizing layer is a method of inspecting by transmitting light through the transfer laminate, but as another method, as in inspection method 3 of the liquid crystal compound alignment layer transfer laminate, a mirror reflector is installed on the opposite side of the light source, , a method of receiving light from the same side as the light source may be used. Whether the irradiated light is natural light or linearly polarized light is the same as described above. In addition, when irradiating natural light and receiving light through a polarizing filter, you may arrange|position a polarizing filter in either between a laminated body and a specular reflection plate, or between a laminated body and a light receiver.

Example

Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to the following Examples, and may be implemented with appropriate changes within a range suitable for the spirit of the present invention, and they , all are included in the technical scope of the present invention. In addition, the evaluation method of the physical property in an Example is as follows.

(1) Three-dimensional surface roughness SRa, SRz, SRy

Using a stylus type three-dimensional illuminometer (SE-3AK, manufactured by Kosaka Genkyusho Co., Ltd.), under conditions of a needle radius of 2 µm and a load of 30 mg, a cut-off value of 0.25 mm in the longitudinal direction of the film was measured. Measured over a length of 1 mm at a needle feed rate of 0.1 mm/sec, divided into 500 points at a pitch of 2 µm, and the height of each point was input to a three-dimensional roughness analysis apparatus (SPA-11). Operation similar to this was continuously performed 150 times at intervals of 2 µm with respect to the width direction of the film, ie, over 0.3 mm in the width direction of the film, and data was inputted into the analysis apparatus. Next, center plane average roughness (SRa), ten-point average roughness (SRz), and maximum height (SRy) were calculated|required using the analysis apparatus.

(2) Number of projections of 0.5 μm or more (releasing surface), 2.0 μm (rear surface) or more

A test piece having a width of 100 mm and a length of 100 mm was cut out in the longitudinal direction of the film, sandwiched between two polarizing plates to form a cross nicol state, and set in a state where the extinction position was maintained. In this state, using a Nikon universal projector V-12 (measurement conditions: projection lens 50x, transmitted illumination luminous flux conversion knob 50x, transmitted light inspection), the long axis of the part (scratches, foreign matter) through which light is transmitted and appears dazzling (scratches, foreign objects) length) of 50 µm or more was detected. The portion thus detected was cut out from the test piece to an appropriate size, and applied to the film surface using a three-dimensional shape measuring device (manufactured by Ryoka Systems, Micromap TYPE 550; measurement conditions: wavelength 550 nm, WAVE mode, objective lens 10x). It was observed and measured from the vertical direction. At this time, it is assumed that the irregularities approaching within 50 µm when observed from the direction perpendicular to the film plane are the same flaws and foreign substances, and a rectangle covering them is assumed, and the length and width of the rectangles are the length and width of the flaws and foreign substances. About this flaw and foreign material, the number of defects was quantified using the cross-sectional image (SURFACE PROFILE DISPLAY). In addition, the measurement was performed with respect to the test piece of 20 sheets, and it converted into the number of faults per 1 m<2>. The number of defects of those having a height difference (difference between the highest and lowest) of 0.5 µm or more was counted on the mold release side, and the number of defects of 2.0 µm or more of height difference on the back side was counted.

(3) Inspection of defects in retardation layer

What has arrange|positioned the rubbing process orientation control layer or photo-alignment control layer as an orientation control layer between the orientation film for transcription|transfer and the liquid crystal compound orientation layer was created as a sample for a test|inspection. The specific preparation procedure is as follows.

(When the orientation control layer is a rubbing treatment orientation control layer)

The orientation film for transfer was cut out in A4 size, and a paint for a rubbing treatment orientation control layer of the following composition was applied to the release layer surface using a bar coater, dried at 80° C. for 5 minutes, and a film having a thickness of 100 nm was formed. Cutting made the orientation main axis of the orientation film for transcription|transfer become parallel to the long side of A4. Then, the surface of the obtained film|membrane was processed with the rubbing roll wound with raised nylon cloth, and the orientation film for transcription|transfer which laminated|stacked the rubbing process orientation control layer was obtained. In addition, rubbing was performed so that it might become 45 degrees with respect to the long direction of the oriented film for transcription|transfer.

Fully saponified polyvinyl alcohol molecular weight 800 2 parts by mass

Ion exchanged water 100 parts by mass

Surfactants 0.1 parts by mass

Then, the solution for phase difference layer formation of the following composition was apply|coated by the bar coating method to the surface which performed the rubbing process. It was dried at 110° C. for 3 minutes, cured by irradiating ultraviolet rays, and a 1/4 wavelength layer was provided to obtain a sample for inspection.

LC242 (manufactured by BASF) 95 parts by mass

trimethylolpropane triacrylate 5 parts by mass

Irgacure 379 3 parts by mass

Surfactants 0.1 parts by mass

methyl ethyl ketone 250 parts by mass

(When the orientation control layer is a photo-alignment control layer)

Based on the description of Examples 1, 2, and 3 of Japanese Patent Application Laid-Open No. 2013-33248, a 5 mass% solution of cyclopentanone of a polymer represented by the following formula was prepared, and used as a paint for a photo-alignment control layer did.

Next, the transfer orientation film was cut into A4 size, and the paint for the photo-alignment control layer of the above composition was applied to the surface of the release layer using a bar coater, dried at 80° C. for 1 minute, and a film having a thickness of 80 nm was formed. Then, polarized UV light was irradiated from the direction of 45 degrees with respect to the long direction of the film, and the orientation film for transcription|transfer which laminated|stacked the optical orientation control layer was obtained. In addition, these coating materials were filtered with a membrane filter with a pore diameter of 0.2 micrometer, and coating and drying were performed in a clean room.

Then, on the surface on which the optical orientation control layer was laminated, the solution for forming a retardation layer was applied by a bar coating method. It was dried at 110° C. for 3 minutes, cured by irradiating ultraviolet rays, and a 1/4 wavelength layer was provided to obtain a sample for inspection.

Next, using these inspection samples, the defects of the retardation layer were inspected in the following procedure.

A lower polarizing plate is placed on top of a surface-emitting light source using a white LED using a yellow phosphor as a light source, and on the test sample prepared as described above, the extinction axis direction (absorption axis direction) of the polarizing plate is the long side of the test sample. was placed parallel to the direction. Furthermore, a λ/4 film made of a stretched film of cyclic polyolefin is placed thereon so that the orientation main axis is at a 45 degree angle to the extinction axis of the lower polarizing plate, and an upper polarizing plate is placed thereon, and an upper polarizing plate has an extinction axis of the lower polarizing plate. It was placed parallel to the optical axis. In this state, the extinction state was observed with the naked eye (center part 15 cm x 20 cm) and a 20-fold loupe (5 cm x 5 cm), and evaluated by the following criteria.

(double-circle): The luminescent point was not recognized visually, and the luminescent point was hardly recognized even by loupe observation (2 or less at 5cmx5cm).

○: Bright spots were not recognized with the naked eye, and a few bright spots were recognized by observation of the loupe (3 or more and 20 or less at 5cm×5cm).

Δ: Bright spots were not visually recognized, but bright spots were recognized by observation of the loupe (more than 20 at 5 cm×5 cm).

x: Bright spots were recognized with the naked eye, or there was overall light leakage, which was attributed to the presence of many bright spots observed by loupe observation although no bright spots were recognized.

(4) Inspection of defects after overlapping 1

Two samples for inspection using the above rubbing treatment orientation control layer were prepared, the respective retardation layer installation surface and the opposite surface were overlapped, and a weight of 1 kg/cm 2 was applied for 10 minutes. The fault of the retardation layer of this sample was carried out similarly to the test|inspection of the (3) retardation layer fault, and it was inspected.

(5) Inspection of defects after overlapping 2

In inspection 1 of defects after overlapping, since it is difficult to know the effect of the roughness of the back surface when the roughness of the release surface is large, the inspection sample using the optical orientation control layer of Experimental Example 2A having a small roughness of the release surface was used. The influence of the roughness of the back surface of the test sample using the optical orientation control layer of another experimental example was investigated.

Specifically, by overlapping the retardation layer installation surface of the test sample in which the 1/4 wavelength layer is provided on the optical orientation control layer of Experimental Example 2A and the opposite surface of the inspection sample using the optical orientation control layer of each Experimental Example, 10 For minutes, a weight of 1 kg/cm 2 was applied. The fault of the retardation layer of this sample (the test sample of Experimental example 2A) was carried out similarly to the test|inspection of the (3) retardation layer defect, and it inspected.

(6) intrinsic viscosity

0.2 g of a resin sample was dissolved in 50 ml of a mixed solvent of phenol/1,1,2,2-tetrachloroethane (60/40 (weight ratio)), and measured using an Ostwald viscometer at 30°C. In addition, the sample of the surface layer A produced the film sample extruded by A-layer independent, and made it the sample.

(7) Content of ester cyclic trimer

The polyester resin constituting the release surface side layer of the polyester film was scraped off with a cutter knife, and then frozen and pulverized finely. 0.1 g of this pulverized resin was dissolved in 3 ml of a mixed solvent of hexafluoroisopropanol (HFIP)/chloroform (2/3 (volume ratio)). 20 ml of chloroform was added to the obtained solution, and it mixed uniformly. Methanol 10ml was added to the obtained liquid mixture, and linear polyester was reprecipitated. Next, the liquid mixture was filtered, and the precipitate was washed with 30 ml of a mixed solvent of chloroform/methanol (2/1 (volume ratio)) and filtered again. The obtained filtrate was concentrated to dryness with a rotary evaporator. 10 ml of dimethylformamide was added to the concentrated dry matter to prepare an ester cyclic trimer measuring solution, and the content of the ester cyclic trimer was determined by liquid chromatography.

(Measuring conditions)

Apparatus: L-7000 (manufactured by Hitachi Seisakusho)

Column: μ-Bondasphere C18 5 μ 100 Angstrom 3.9 mm×15 cm (manufactured by Waters)

Solvent: Eluent A: 2% acetic acid/water (v/v)

Eluent B: acetonitrile

Gradient B%: 10→100% (0→55 min)

Flow rate: 0.8ml/min

Temperature: 30℃

Detector: UV-258nm

(8) Precipitation amount of ester cyclic trimer on the surface of the release surface of the film

The polyester film was cut into 15 cm x 15 cm, and it heated at 150 degreeC in oven for 90 minutes. After that, the heat-treated film is placed on a 15 cm × 15 cm stainless steel plate with the release side facing up, and a 15 cm × 15 cm silicone sheet (thickness 5 mm) with a 10 cm × 10 cm hole in the center is placed thereon, and additional silicone The sheet and a stainless steel plate of the same shape (thickness 2 mm) were overlapped, and the periphery was fixed with a clip. Next, 4 ml of DMF (dimethyl sulfoamide) was put into the hole in the center and left to stand for 3 minutes, and then DMF was recovered. The amount of the ester cyclic trimer in the recovered DMF was determined by liquid chromatography. This value was divided by the film area to which DMF was brought into contact, and it was made into the precipitation amount (mg/m<2>) of the ester cyclic trimer in the surface of the release surface of a film.

(Measuring conditions)

Device: ACQUITY UPLC (manufactured by Waters)

Column: BEH-C18 2.1 x 150 mm (manufactured by Waters)

Mobile phase: Eluent A: 0.1% formic acid (v/v)

Eluent B: acetonitrile

Slope B%: 10→98→98% (0→25→30 minutes)

Flow rate: 0.2ml/min

Column temperature: 40°C

Detector: UV-258nm

(9) winding stability

The winding state of the film with a width of 1800 cm created in the experimental example was evaluated visually.

(circle): The roll edge part was uniform, and stable winding was possible without wrinkling.

(triangle|delta): Although wrinkles were recognized in part, the roll edge part was substantially uniform, and stable winding was possible.

x: It wrinkled irregularly, the unevenness|corrugation of the roll edge part was also large, and stable winding was not possible.

<Production of polyester resin for oriented film for transfer>

(Production of particle-free polyester resin (PET(X-m)))

When the temperature of the esterification reaction tube was raised to 200° C., 86.4 parts by mass of terephthalic acid and 64.6 parts by mass of ethylene glycol were added, and while stirring, 0.017 parts by mass of antimony trioxide as a catalyst, 0.064 parts by mass of magnesium acetate tetrahydrate, and triethyl 0.16 mass parts of amines were put. Then, after pressurizing temperature rise and performing pressure esterification on the conditions of 0.34 MPa of gauge pressure and 240 degreeC, the esterification reaction tube was returned to normal pressure, and 0.014 mass parts of phosphoric acid was added. Again, it heated up to 260 degreeC over 15 minutes, and added 0.012 mass part of trimethyl phosphates. Then, 15 minutes later, dispersion treatment was performed with a high-pressure disperser, and after 15 minutes, the obtained esterification reaction product was transferred to a polycondensation reaction tube, and polycondensation reaction was performed at 280°C under reduced pressure.

After completion of the polycondensation reaction, filtration is performed with a 95% Naslon filter having a cut diameter of 5 µm, extruded from the nozzle into a strand shape, and cooled and solidified using cooling water previously subjected to filtration (pore diameter: 1 µm or less). , and cut into pellets to obtain polyethylene terephthalate resin (PET (Xm)). The intrinsic viscosity of PET (X-m) was 0.62 dl/g, the content of the ester cyclic trimer was 1.05 mass%, and the inert particles and internally precipitated particles were not contained substantially.

(Preparation of silica particle-containing polyester resin (PET (Z-Si1)))

In the manufacture of PET (X-m),

15 minutes after the temperature was raised to 260° C. and trimethyl phosphate was added, the silica particle ethylene glycol slurry was added so as to be 10000 ppm based on the resulting polyester;

· A silica particle-containing polyethylene terephthalate resin having an intrinsic viscosity of 0.63 dl/g was obtained in the same manner except for performing the filtration treatment with a Naslon filter (manufactured by Nippon Seisen Co., Ltd.) with a 95% cut diameter of 20 µm.

In the ethylene glycol slurry of silica particles, silica particles having an average particle diameter of 2.5 µm (manufactured by Fuji Silicia Co., Ltd.) are put in ethylene glycol, and further filtered with a viscose rayon filter having a 95% cut diameter of 30 µm. It was prepared by

(Silica particle-containing polyester resin (PET (Z-Si2) production))

In the production of PET (Z-Si1), a silica particle-containing polyethylene terephthalate resin having an intrinsic viscosity of 0.63 dl/g was obtained in the same manner except that porous colloidal silica having an average particle diameter of 0.9 μm was used as the silica particles.

(Preparation of silica particle-containing polyester resin (PET (Z-Si3)))

In the production of PET (Z-Si1), a polyethylene terephthalate resin containing silica particles having an intrinsic viscosity of 0.63 dl/g was obtained in the same manner except that porous colloidal silica having an average particle diameter of 0.2 µm was used as the silica particles.

(Preparation of silica particle-containing polyester resin (PET (Z-Si4)))

In the production of PET (Z-Si1), a silica particle-containing polyethylene terephthalate resin having an intrinsic viscosity of 0.63 dl/g was obtained in the same manner except that porous colloidal silica having an average particle diameter of 0.06 µm was used as the silica particles.

(Preparation of calcium carbonate particles-containing polyester resin (PET (Z-Ca)))

In the production of PET (Z-Si1), a polyethylene terephthalate resin containing calcium carbonate particles having an intrinsic viscosity of 0.63 dl/g was prepared in the same manner except that an ethylene glycol slurry of calcium carbonate particles was used instead of an ethylene glycol slurry of silica particles. got it

In addition, the ethylene glycol slurry of calcium carbonate particle|grains was manufactured using the calcium carbonate particle (made by Maruo Calcium Co., Ltd.) with an average particle diameter of 0.6 micrometer instead of a silica particle.

(Production of crosslinked polystyrene particles-containing polyester resin (PET (Z-St)))

A 10 mass % aqueous dispersion of PET (X-m) and crosslinked polystyrene particles having an average particle diameter of 0.30 µm was supplied to a vented twin screw extruder, and the mixture was heated and melted at 280°C. Moisture was removed by setting the vent hole to a pressure-reducing degree of 1 kPa or less. The molten polyester is filtered with a filter made of Naslon with a 95% cut diameter of 20 µm, extruded from the nozzle into a strand shape, cooled and solidified using cooling water previously subjected to filtration (pore diameter: 1 µm or less), cut into pellets. The obtained crosslinked polystyrene particle-containing polyester resin (PET (Z-St)) had an intrinsic viscosity of 0.62 dl/g, and a crosslinked polystyrene particle content of 10000 ppm.

Experimental Examples 1A to 4A

As a raw material for the release layer side of the oriented film for transfer, PET (Xm) resin pellets containing no particles are dried under reduced pressure (1 Torr) at 135° C. for 6 hours, then supplied to the extruder 1, and the raw material for the opposite side layer (back side layer) As, PET(Xm) resin pellets and polyester (PET(Z-Si1)) resin pellets containing particles are mixed in a ratio such that the particle content of the opposite side layer (back side layer) becomes a predetermined value shown in Table 1. The mixture was dried, supplied to the extruder 2, and melted at 285°C. Each of these two types of molten polymers is filtered through a stainless steel sintered filter medium (nominal filtration precision of 10 µm particle 95% cut), laminated with two types of two-layer merging blocks, and formed into a sheet form from a nozzle After extruding, it was wound around a casting drum having a surface temperature of 30°C using an electrostatic application casting method to solidify by cooling, thereby making an unstretched film. At this time, the discharge amount of each extruder was adjusted so that the thickness of a mold release layer and a back surface layer might become the predetermined value shown in Table 1.

This unstretched film was guide|guided|guided|guided|derived to the tenter extending|stretching machine, and it guide|induced to the hot air zone with a temperature of 125 degreeC, holding the edge part of a film with a clip, and extended|stretched 4.0 times in the width direction. Next, maintaining the width|variety extended|stretched in the width direction, the temperature 210 degreeC and the heat setting process for 10 second were performed, and also 3.0% of relaxation processing was performed. Thereafter, both ends of the film cooled to 130° C. are cut with a shear blade, and after cutting out the ears with a tension of 0.5 kg/mm 2 , it is wound and uniaxially oriented PET film with a film thickness of 50 μm (width 1800 cm). The central part of the obtained film was slitted to 50 cm width, and it was set as the film roll (orientation film for transcription|transfer) of about 500 m in length.

Experimental Examples 5A, 6A

A film roll (orientation film for transfer) was obtained in the same manner as in Experimental Examples 1A to 4A except that PET (Z-Si1) resin pellets were changed to PET (Z-Ca) among the raw materials for the opposite surface layer (back surface layer).

Experimental Example 7A

The unstretched film produced by the same method as in Experimental Example 1A was heated to 105° C. using a heated roll group and an infrared heater, and then stretched 3.3 times in the traveling direction with a roll group having a peripheral speed difference, followed by a temperature of 135° C. Induced to a hot air zone of , stretched 3.5 times in the width direction, the heat setting temperature was 225 ° C., and the other was obtained in the same manner as the transfer orientation film of Experimental Example 1A to obtain a biaxially oriented PET film of Experimental Example 7A. The central part of the obtained film was slitted to 50 cm width, and it was set as the film roll of about 500 m in length. The film thickness was adjusted by changing the extrusion amount and thickening the thickness of the unstretched film.

Experimental Example 8A

As an unstretched film, except having used what was produced by the method similar to Experimental example 5A, it carried out similarly to Experimental example 7A, and obtained the film roll (orientation film for transcription|transfer).

Experimental Example 9A

Among the raw materials for the reverse side layer (back side layer), except that PET (Z-Si1) resin pellets were changed to a combination of PET (Z-Si2) and PET (Z-Ca), in the same manner as in Experimental Examples 1A to 4A, the film roll (Orientation film for transcription|transfer) was obtained.

Experimental Example 10A

As a raw material for the release layer side of the oriented film for transfer, PET (Xm) resin pellets and PET (Z-Si4) resin pellets were mixed in a ratio such that the particle content of the release layer becomes a predetermined value shown in Table 1 After drying under reduced pressure (1 Torr) at 135 ° C. for 6 hours, it is supplied to extruder 1, and as a raw material for the opposite side layer (back side layer), polyester (PET (Z-Si3) and PET (Z-St)) resin pellets are mixed in a ratio such that the particle content of the opposite side layer (back side layer) becomes a predetermined value shown in Table 1, dried and fed to extruder 2, and PET as a raw material for the intermediate layer (Xm) The resin pellet was dried and supplied to the extruder 3, and it melt|melted at 285 degreeC. Each of these three types of molten polymers was filtered with a stainless steel sintered filter medium (nominal filtration precision of 10 µm particle 95% cut), laminated with three types of three-layer merging blocks, extruded from a nozzle into a sheet shape, followed by electrostatic application It was wound around a casting drum with a surface temperature of 30 degreeC using the casting method, it cooled and solidified, and the unstretched film was made. At this time, the discharge amount of each extruder was adjusted so that the thickness of a mold release layer and a back surface layer might become the predetermined value shown in Table 1. After that, it uniaxially stretched similarly to Experimental example 1A - 4A, and obtained the film roll (orientation film for transcription|transfer).

Experimental Example 11A

Instead of uniaxial stretching, except having performed biaxial stretching similarly to Experimental example 7A, it carried out similarly to Experimental example 10A, and obtained the film roll (orientation film for transcription|transfer).

Experimental Example 12A

The coating agent of the following composition was applied to the release layer surface of the film of Experimental Example 1A, and dried in a heating oven at 150° C. for 3 minutes to form a planarization and oligomer block coating layer. The thickness of the coating layer was 2 µm.

-Melamine crosslinked alkyl-modified alkyd resin (manufactured by Hitachi Kasei Polymers: Tespine 322: solid content 40%) 10 parts by mass

・P-toluenesulfonic acid (manufactured by Hitachi Kasei Polymers: Dryer 900) 0.1 parts by mass

・Solvent (toluene/methyl ethyl ketone = 1/1 parts by mass) 40 parts by mass

In addition, the coating agent is filtered with a filter of 2 μm, and the air at the time of drying is filtered with a HEPA filter with a 95% cut diameter of 1 μm, and then again with a high precision with a HEPA filter with a 99.9% cut diameter of 0.3 μm. filtered was used. In addition, application|coating to the film of the coating agent was performed in the environment of class 1,000. Hereinafter, the coating/drying process was performed under the same environment.

Experimental Example 13A

In Experimental Example 12A, a film roll (orientated film for transfer) was obtained in the same manner as in Experimental Example 12A except that the surface layer thickness was changed from 10 µm to 25 µm and the thickness of the back layer was changed from 40 µm to 25 µm.

Experimental Example 14A

On the opposite side of the release surface of Experimental Example 9A, a coating solution prepared by diluting Byron RV220 (manufactured by Toyobo) with a toluene/methyl ethyl ketone (= 1:1) solution to a solid content of 7% by mass was applied with a gravure coater, It dried at 120 degreeC for 30 second, and formed the planarization coating layer on the back surface.

Experimental Example 15A

Both extruders 1 and 2 were fed with particle-free PET (X-m) resin pellets to make unstretched films. Next, a coating solution of the following composition was applied to one side of the unstretched film so that the application amount after drying was 0.1 g/m 2 , followed by a dryer, and dried at 80° C. for 20 seconds to form a lubricating coating layer on the back side did it Furthermore, a lubricating coating layer was provided with the casting drum contact surface as the back surface.

(coating liquid 1)

water 50.00 parts by mass

isopropyl alcohol 36.10 parts by mass

polyester water dispersion 13.00 parts by mass (Toyobo MD-1200 solid content concentration 34 mass%)

colloidal silica 0.60 parts by mass (manufactured by Nissan Chemical, MP2040, average particle size 200 nm, solid content concentration of 40 mass%)

Surfactant (fluorine-based, solid content concentration 10% by mass) 0.30 parts by mass

Next, this unstretched film was guide|guided|guided|guided|derived to the tenter stretching machine, it guide|induced to the hot air zone with a temperature of 125 degreeC, holding the edge part of a film with a clip, and extended|stretched 4.0 times in the width direction. Next, maintaining the width|variety extended|stretched in the width direction, the temperature 210 degreeC and the heat setting process for 10 second were performed, and also 3.0% of relaxation processing was performed. Thereafter, both ends of the film cooled to 130° C. were cut with a shearing blade, and after cutting out the ear portion with a tension of 0.5 kg/mm 2 , it was wound up, and a uniaxially oriented PET film (width 1800 cm) having a film thickness of 50 μm was obtained. The central part of the obtained film was slitted to 50 cm width, and it was set as the film roll (orientation film for transcription|transfer) of about 500 m in length.

Experimental Example 16A

Except having changed the coating liquid into the coating liquid of the following composition, it carried out similarly to Experimental Example 15A, and obtained the film roll (orientation film for transcription|transfer) in which the lubricating coating layer was formed on the back surface.

water 55.62 mass%

isopropanol 30.00 mass%

Polyurethane resin (D-1) 11.29 mass%

Oxazoline-based crosslinking agent (E-1) 2.26 mass%

particle 0.71 mass% (Silica sol with an average particle diameter of 40 nm, solid content concentration of 40 mass%)

particle 0.07 mass% (Silica sol with an average particle diameter of 450 nm, solid content concentration of 40 mass%)

Surfactants 0.05 mass% (Silicone-based, solid content concentration 100% by mass) (solid content concentration 10% by mass)

In addition, the polyurethane resin (D-1) and the oxazoline type crosslinking agent (E-1) in the said composition were manufactured by the following procedure.

(Production of polyurethane resin (D-1))

Polyurethane resin D-1 having an aliphatic polycarbonate polyol as a constituent component was produced in the following procedure. To a four-neck 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, a number average molecular weight of 2000 153.41 parts by mass of polyhexamethylene carbonate diol, 0.03 parts by mass of dibutyltin dilaurate, and 84.00 parts by mass of acetone as a solvent were added, and stirred for 3 hours at 75° C. in a nitrogen atmosphere, so that the reaction solution was adjusted to a predetermined amine equivalent confirmed that it has been reached. Next, after temperature-falling this reaction liquid to 40 degreeC, 8.77 mass parts of triethylamines were added and the polyurethane prepolymer solution was obtained. Next, in a reaction vessel equipped with a homodisper capable of high-speed stirring, 450 g of water was added, adjusted to 25°C, and stirred and mixed at 2000 min-1, a polyurethane prepolymer solution was added and dispersed in water. Then, the water-soluble polyurethane resin (D-1) with a solid content concentration of 35 mass % was prepared by removing a part of acetone and water under reduced pressure. The glass transition point temperature of the obtained polyurethane resin (D-1) was -30 degreeC.

(Preparation of oxazoline-based crosslinking agent (E-1))

A mixture of 58 parts by mass of ion-exchanged water as an aqueous medium and 58 parts by mass of isopropanol in a flask equipped with a thermometer, a nitrogen gas introduction tube, a reflux condenser, a dropping funnel and a stirrer, and a polymerization initiator (2,2'-azobis(2) -Amidinopropane) and dihydrochloride) 4 mass parts were thrown in. On the other hand, in a dropping funnel, 16 parts by mass of 2-isopropenyl-2-oxazoline as a polymerizable unsaturated monomer having an oxazoline group, methoxypolyethylene glycol acrylate (average added moles of ethylene glycol, 9 moles, Shin-Nakamura Chemical) Manufacture) 32 mass parts and the mixture of 32 mass parts of methyl methacrylates were thrown in, and it was dripped at 70 degreeC in nitrogen atmosphere over 1 hour. After completion of the dropwise addition, the reaction solution was stirred for 9 hours and cooled to obtain a water-soluble resin (E-1) having an oxazoline group having a solid content concentration of 40% by mass.

Experimental Example 17A

In Experimental Example 1A, the particle content in the back layer was changed from 300 ppm to 2000 ppm, the ratio of the thickness of the release layer to the back layer was changed from 10/40 to 25/25, and the release layer surface was similar to Experimental Example 12A. Except having provided the planarization and oligomer block coating layer, it carried out similarly to Experimental example 1A, and obtained the film roll (orientation film for transcription|transfer).

Experimental Example 18A

As a raw material for the release layer side of the oriented film for transfer, PET (Xm) resin pellets were dried under reduced pressure (1 Torr) at 135 ° C. for 6 hours, then supplied to the extruder 1, and as a raw material for the opposite side layer (back side layer), PET (Xm) ) The resin pellets are dried and fed to the extruder 2, and as raw materials for the intermediate layer, PET (Xm) resin pellets and PET (Z-Si1) resin pellets, the particle content of the intermediate layer becomes a predetermined value shown in Table 1. What was mixed in the ratio was dried, supplied to the extruder 3, and melted at 285 degreeC. Each of these three types of molten polymers was filtered with a stainless steel sintered filter medium (nominal filtration precision of 10 µm particle 95% cut), laminated with three types of three-layer merging blocks, extruded from a nozzle into a sheet shape, followed by electrostatic application It was wound around a casting drum with a surface temperature of 30 degreeC using the casting method, it cooled and solidified, and the unstretched film was made. At this time, the discharge amount of each extruder was adjusted so that the thickness of a mold release layer, an intermediate|middle layer, and a back layer might become the predetermined value shown in Table 1. After that, it uniaxially stretched similarly to Experimental example 1A - 4A, and obtained the film roll (orientation film for transcription|transfer).

Experimental Example 1B

As a raw material for the release layer side of the oriented film for transfer, PET (Xm) resin pellets containing no particles are dried under reduced pressure (1 Torr) at 135° C. for 6 hours, then supplied to the extruder 1, and the raw material for the opposite side layer (back side layer) As, PET(Xm) resin pellets and polyester (PET(Z-Si1)) resin pellets containing particles are mixed in a ratio such that the particle content of the opposite side layer (back side layer) becomes a predetermined value shown in Table 1. The mixture was dried, supplied to the extruder 2, and melted at 285°C. These two types of molten polymers are each filtered with a stainless steel sintered filter medium (nominal filtration precision of 10 µm particle 95% cut), laminated with two types of two-layer merging blocks, extruded from a nozzle into a sheet form, and then subjected to electrostatic application It was wound around a casting drum with a surface temperature of 30 degreeC using the casting method, it cooled and solidified, and the unstretched film was made. At this time, the discharge amount of each extruder was adjusted so that the thickness of a mold release layer and a back surface layer might become the predetermined value shown in Table 1.

This unstretched film was guide|guided|guided|guided|derived to the tenter extending|stretching machine, and it guide|induced to the hot air zone with a temperature of 125 degreeC, holding the edge part of a film with a clip, and extended|stretched 4.0 times in the width direction. Next, maintaining the width|variety extended|stretched in the width direction, the temperature 210 degreeC and the heat setting process for 10 second were performed, and also 3.0% of relaxation processing was performed. Thereafter, both ends of the film cooled to 130° C. were cut with a shearing blade, and after cutting out the ear portion with a tension of 0.5 kg/mm 2 , it was wound up, and a uniaxially oriented PET film (width 1800 cm) having a film thickness of 50 μm was obtained. The central part of the obtained film was slitted to 50 cm width, and it was set as the film roll (orientation film for transcription|transfer) of about 500 m in length.

Experimental Example 2B

A commercially available biaxially stretched polyester film (manufactured by Toyobo Corporation, Toyobo Ester (R) film, E5100) was used as the transfer orientation film. The non-corona surface was used as the release surface.

Experimental Example 3B

Except not having provided the lubricating coating layer, it carried out similarly to Experimental example 16A, and obtained the film roll (orientation film for transcription|transfer). In winding-up, it wrinkled, and since stable winding was not possible, evaluation of the orientation film for transcription|transfer was not performed. In addition, in the measurement of roughness, the casting drum non-contact surface was made into the mold release surface, and the casting drum contact surface was evaluated as the back surface.

Table 1 shows the manufacturing conditions, characteristics, and evaluation results of the transfer oriented films of Experimental Examples 1A to 18A and Experimental Examples 1B to 3B.

[Table 1]

As is apparent from Table 1, all of Experimental Examples 1A to 18A in which the surface roughness of the release surface satisfies the requirements of the first invention had defects in the case of having a rubbing treatment orientation control layer and a photo-orientation control layer during defect evaluation. There were remarkably few faults in this case, and generation|occurrence|production of the light leakage in the shape of a pinhole or a flaw was fully suppressed. On the other hand, Experimental Example 1B, in which the particle content of the back layer was too high and the surface roughness of the release surface was too large, was particularly defective in the case of having a rubbing treatment orientation control layer and in the case of having a photo-orientation control layer. There were remarkably many faults, and generation|occurrence|production of the light leakage in the shape of a pinhole or a flaw could not be suppressed. Similarly, compared with Experimental Examples 15A and 16A, in Experimental Example 2B, which did not have a release coating layer on the back surface and the surface roughness of the release surface was too large, defects and photo-orientation in the case of having a rubbing treatment orientation control layer in particular during flaw evaluation In the case of having a control layer, there were remarkably many faults, and generation|occurrence|production of the light leakage in the shape of a pinhole or flaw could not be suppressed.

Moreover, as is clear from Table 1, Experimental Examples 1A to 3A, 5A to 16A, and 18A in which the surface roughness of the surface (rear surface) on the opposite side to the release surface satisfy the requirements of the second invention are all defective in fault evaluation This was remarkably small, and generation|occurrence|production of the light leakage in the shape of a pinhole or a flaw was fully suppressed. On the other hand, since no particles were contained and no lubricating coating layer was provided on the back surface, Experimental Example 3B having an excessively small surface roughness on the back surface was inferior in winding stability and had a problem that stable winding could not be performed. In addition, in Experimental Examples 4A and 1B, in which the particle content of the particles of the back surface layer was too large and the surface roughness of the back surface was too large, especially the defects 1 and 2 after overlapping were remarkably large, so that the occurrence of pinhole-like or scratch-like light leakage could be suppressed. couldn't

Industrial Applicability

In the alignment film for liquid crystal compound alignment layer transfer of the present invention, a film whose surface roughness is controlled within a specific range is used as an alignment film for transfer of a retardation layer or a polarizing layer, and the surface roughness of the surface opposite to the release surface is Since a film controlled within a specific range is used as an orientation film for the transfer of the retardation layer or the polarizing layer, the orientation state and retardation of the liquid crystal compound in the retardation layer or the polarizing layer can be set as designed, and the occurrence of defects such as pinholes is reduced. A reduced retardation layer or a polarization layer (liquid crystal compound alignment layer) can be formed. Therefore, according to this invention, retardation layer laminated polarizing plates, such as a circularly polarizing plate, can be manufactured stably with high quality.

Claims (18)

An alignment film for transferring a liquid crystal compound alignment layer to a target object, wherein the surface roughness (SRa) of a release surface of the alignment film is 1 nm or more and 30 nm or less. oriented film. The method of claim 1,
The alignment film for liquid crystal compound alignment layer transfer, characterized in that 10-point surface roughness (SRz) of the release surface of the alignment film is 5 nm or more and 200 nm or less. 3. The method according to claim 1 or 2,
The alignment film for liquid crystal compound alignment layer transfer, characterized in that the alignment film is a polyester film. A laminate in which a liquid crystal compound alignment layer and an alignment film are laminated, wherein the alignment film is the alignment film according to any one of claims 1 to 3, characterized in that the liquid crystal compound alignment layer transfer laminate. A liquid crystal compound comprising a step of bonding a polarizing plate and a surface of the liquid crystal compound alignment layer of the laminate according to claim 4 to form an intermediate laminate, and a step of peeling the alignment film from the intermediate laminate. A method of manufacturing an alignment layer laminated polarizing plate. A method of inspecting the alignment state of the liquid crystal compound alignment layer in the laminate according to claim 4, in the alignment direction of the alignment film, or in a direction orthogonal to the alignment direction, or in the flow direction of the alignment film, or in the flow direction and Inspection of a liquid crystal compound alignment layer transfer laminate comprising a step of irradiating linearly polarized light having an electric field oscillation direction parallel to an orthogonal direction from the alignment film surface of the laminate, and receiving light from the liquid crystal compound alignment layer surface side Way. A method of inspecting the alignment state of the liquid crystal compound alignment layer in the laminate according to claim 4, comprising the step of irradiating elliptically polarized light from the liquid crystal compound alignment layer surface of the laminate and receiving light from the alignment film surface side The inspection method of the laminated body for liquid crystal compound alignment layer transcription|transfer. A method of inspecting the alignment state of the liquid crystal compound alignment layer in the laminate according to claim 4, in the alignment direction of the alignment film, or in a direction orthogonal to the alignment direction, or in the flow direction of the alignment film, or in the flow direction and A step of irradiating linearly polarized light having an electric field oscillation direction parallel to an orthogonal direction from the oriented film surface of the laminate, and a step of reflecting light transmitted through the laminate by a mirror reflecting plate provided on the liquid crystal compound alignment layer side of the laminate; , and a step of receiving the reflected light from the alignment film side, the inspection method of the liquid crystal compound alignment layer transfer laminate. A method for inspecting the alignment state of the liquid crystal compound alignment layer in the laminate according to claim 4, comprising at least a step of irradiating the laminate with polarized light to pass the polarized light through the laminate, and receiving the polarized light passing through the laminate polarized light passing through the orientation film of the laminate is parallel to the orientation direction of the orientation film, or in a direction orthogonal to the orientation direction, or in the flow direction of the orientation film, or in a direction orthogonal to the flow direction A method for inspecting a laminate for liquid crystal compound alignment layer transfer, characterized in that either linearly polarized light having an electric field vibration direction or polarized light passing through the liquid crystal compound alignment layer surface of the laminate is elliptically polarized light. An alignment film for transferring a liquid crystal compound alignment layer to an object, wherein the surface roughness (SRa) of the surface opposite to the release surface of the alignment film is 1 nm or more and 50 nm or less, and the surface on the opposite side to the release surface of the alignment film The alignment film for liquid crystal compound alignment layer transfer, characterized in that 10-point surface roughness (SRz) is 10 nm or more and 1500 nm or less. 11. The method of claim 10,
The alignment film for liquid crystal compound alignment layer transfer, wherein the maximum height (SRy) of the surface on the opposite side to the release surface of the alignment film is 15 nm or more and 2000 nm or less. 12. The method of claim 10 or 11,
The alignment film for liquid crystal compound alignment layer transfer, characterized in that the alignment film is a polyester film. A laminate in which a liquid crystal compound alignment layer and an alignment film are laminated, wherein the alignment film is the alignment film according to any one of claims 10 to 12, characterized in that the liquid crystal compound alignment layer transfer laminate. A liquid crystal compound alignment layer laminated polarizing plate comprising the steps of bonding the polarizing plate and the liquid crystal compound alignment layer surface of the laminate according to claim 13 to form an intermediate laminate, and peeling the alignment film from the intermediate laminate. manufacturing method. A method for inspecting the alignment state of the liquid crystal compound alignment layer in the laminate according to claim 13, in the alignment direction of the alignment film, or in a direction orthogonal to the alignment direction, or in the flow direction of the alignment film, or in the flow direction and Inspection of a liquid crystal compound alignment layer transfer laminate comprising a step of irradiating linearly polarized light having an electric field oscillation direction parallel to an orthogonal direction from the alignment film surface of the laminate, and receiving light from the liquid crystal compound alignment layer surface side Way. A method of inspecting the alignment state of the liquid crystal compound alignment layer in the laminate according to claim 13, comprising the step of irradiating elliptically polarized light from the liquid crystal compound alignment layer surface of the laminate and receiving light from the alignment film surface side. The inspection method of the laminated body for liquid crystal compound alignment layer transcription|transfer. A method for inspecting the alignment state of the liquid crystal compound alignment layer in the laminate according to claim 13, in the alignment direction of the alignment film, or in a direction orthogonal to the alignment direction, or in the flow direction of the alignment film, or in the flow direction and A step of irradiating linearly polarized light having an electric field oscillation direction parallel to an orthogonal direction from the oriented film surface of the laminate, and a step of reflecting light transmitted through the laminate by a mirror reflecting plate provided on the liquid crystal compound alignment layer side of the laminate; , and a step of receiving the reflected light from the alignment film side, the inspection method of the liquid crystal compound alignment layer transfer laminate. A method for inspecting the alignment state of the liquid crystal compound alignment layer in the laminate according to claim 13, comprising at least a step of irradiating the laminate with polarized light to pass the polarized light through the laminate, and receiving the polarized light passing through the laminate polarized light passing through the orientation film of the laminate is parallel to the orientation direction of the orientation film, or in a direction orthogonal to the orientation direction, or in the flow direction of the orientation film, or in a direction orthogonal to the flow direction A method for inspecting a laminate for liquid crystal compound alignment layer transfer, characterized in that either linearly polarized light having an electric field vibration direction or polarized light passing through the liquid crystal compound alignment layer surface of the laminate is elliptically polarized light.