KR20210082163A - Liquid crystal compound alignment layer transfer film - Google Patents

Abstract

The present invention provides a cyclic polyolefin-based transfer film for transferring a liquid crystal compound alignment layer, which can form a retardation layer or a polarizing layer (liquid crystal compound alignment layer) with reduced occurrence of defects such as pinholes. do. A cyclic polyolefin-based film for transferring a liquid crystal compound alignment layer to an object, wherein the surface roughness (SRa) of the release surface of the film is 1 nm or more and 30 nm or less.

Description

Liquid crystal compound alignment layer transfer film

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, and transparent resin films, such as polyester, triacetyl cellulose, and cyclic polyolefin, are illustrated many. Among these, since there is no refractive index anisotropy, a cyclic polyolefin-type film can test|inspect (evaluate) the state of retardation layer in the state which provided retardation layer in the film base material, and is preferable.

However, when a retardation layer laminated polarizing plate (circular polarizing plate) manufactured by using a cyclic polyolefin-based film 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 cyclic polyolefin-based transfer film for transferring a liquid crystal compound alignment layer, which can form a retardation layer or a polarizing layer (liquid crystal compound alignment layer) with reduced occurrence of defects such as pinholes. It is intended to provide a film for use.

In order to achieve this object, the present inventor examined the cause of which defects, such as a pinhole, generate|occur|produce in the retardation layer laminated polarizing plate (circular polarizing plate) manufactured using a cyclic polyolefin type film as a transfer film base material. As a result, the microstructure on the surface of the film substrate has a large effect on the alignment state and phase difference of the liquid crystal compound in the retardation layer made of the liquid crystal compound formed on the film substrate, so that the designed alignment state and phase difference can be obtained. There are cases where there is no such thing, and it discovered that faults, such as a pinhole, arise 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 was discovered that the retardation layer and the polarization layer (liquid crystal compound alignment layer) in which generation|occurrence|production of faults, such as a pinhole, were reduced can be formed, and this invention was completed.

That is, this invention has the structure of the following (1)-(4).

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

(2) The liquid crystal compound alignment layer transfer film according to (1), wherein the 10-point surface roughness (SRz) of the release surface of the transfer film is 5 nm or more and 200 nm or less.

(3) A laminate in which a liquid crystal compound alignment layer and a transfer film are laminated, wherein the transfer film is the transfer film according to (1) or (2).

(4) A liquid crystal compound comprising a step of bonding a polarizing plate and a liquid crystal compound alignment layer surface of the laminate according to (3) to form an intermediate laminate, and a step of peeling the transfer film from the intermediate laminate. A method of manufacturing an alignment layer laminated polarizing plate.

According to the present invention, by using a cyclic polyolefin-based film whose surface roughness is controlled within a specific range as a transfer film for a retardation layer or a polarizing layer, the alignment state and retardation of the liquid crystal compound in the retardation layer or the polarizing layer can be set as designed. Therefore, it is possible to form a retardation layer or a polarizing layer (liquid crystal compound alignment layer) in which the occurrence of defects such as pinholes is reduced.

The transfer 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 the surface roughness (SRa) of the release surface of the transfer film is 1 nm or more and 30 nm or less. do. In addition, although a film single-piece|unit may be sufficient as the film for transcription|transfer, the mold release layer may be provided by coating etc. in the film used as a base material. Moreover, an antistatic layer, a lubricating layer, etc. may be provided in the back surface. In addition, in the present invention, a layer such as a release coat is not used, but a film used as a film for transfer alone, or a film used as a film for transfer by providing a release coat or a coat on the back side, is collectively referred to as a transfer film, and a coat The film of the state before installing a etc. is called a base film.

Resin which comprises the film base material used for the film for transcription|transfer of this invention is a cyclic polyolefin type thing. Cyclic polyolefin is a compound containing an alicyclic structure in the repeating unit of a polymer. Although a cycloalkane structure, a cycloalkene structure, etc. are mentioned as an alicyclic structure, From a transparency viewpoint, a cycloalkane structure is preferable. The proportion of the repeating unit having an alicyclic structure in the cyclic polyolefin may be appropriately selected depending on the intended use, but is usually 50 mass% or more, preferably 70 mass% or more, and more preferably 90 mass% or more. As a preferable cyclic polyolefin, a norbornene-type polymer is mentioned, Especially the hydrogenated substance of a norbornene-type polymer is preferable. These can use what is used as an optical film as a suitable example.

As a structure, the film for transcription|transfer 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 Furthermore, the multilayer structure of 4 or more layers may be sufficient further.

The transfer film is industrially supplied as a roll in which the film is wound. 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 transfer film of this invention is smooth. In addition, in this invention, the "release surface" of the transfer film means the surface on which the liquid crystal compound orientation layer to transfer of the transfer film is intended among the surfaces of the transfer film. When a flattening coating layer or a release layer, which will be described later, is provided, if a liquid crystal compound alignment layer is provided thereon, the surface (surface in contact with the liquid crystal compound alignment layer) of the flattening layer or the release layer, etc. It is “a different face”.

The lower limit of the three-dimensional arithmetic mean roughness (SRa) of the release surface of the transfer film of the present invention is preferably 1 nm, more preferably 2 nm. If it is less than the above, it may be difficult to realistically achieve the numerical value. The upper limit of SRa of the release surface of the transfer film 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. When the above is exceeded, the orientation of a liquid crystal compound may be disturbed.

The lower limit of the three-dimensional ten-point average roughness (SRz) of the release surface of the transfer film of the present invention is preferably 5 nm, more preferably 10 nm, still more preferably 13 nm. If it is less than the above, it may be difficult to realistically achieve the numerical value. The upper limit of SRz of the release surface of the transfer film of the present invention is preferably 200 nm, more preferably 150 nm, still more preferably 120 nm, particularly preferably 100 nm, and most preferably 80 nm. When the above is exceeded, the orientation of a liquid crystal compound may be disturbed.

The lower limit of the maximum height of the release surface of the transfer film 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. . If it is less than the above, it may be difficult to realistically achieve the numerical value. The upper limit of SRy of the release surface of the transfer film 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. When the above is exceeded, the orientation of a liquid crystal compound may be disturbed.

The upper limit of the number of projections of 0.5 µm or more in height difference of the release surface of the transfer film of the present invention is preferably 5/m2, more preferably 4/m2, further preferably 3/m2, particularly Preferably it is 2 pieces/m<2>, and most preferably, it is 1 piece/m<2>. When the above is exceeded, the orientation of a liquid crystal compound may be disturbed.

When the roughness of the release surface exceeds the above range, the orientation state or phase difference as designed does not occur in the minute portions of the liquid crystal compound alignment layer formed on the transfer film of the present invention, and pinhole-like or scratch-like defects may occur. This reason is considered as follows. First, as described later, between the transfer film and the liquid crystal compound alignment layer, an alignment control layer such as a rubbing treatment orientation control layer or a photo alignment control layer may be provided, but if this alignment control layer is a rubbing treatment alignment control layer, It is thought that the defect generation|occurrence|production is that the orientation control layer of a convex part peels off at the time of rubbing, and the rubbing of the base part of a convex part, or a recessed part becomes inadequate. 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.

In addition, even when the liquid crystal compound alignment layer is directly formed on the transfer film without providing an orientation control layer, the liquid crystal compound alignment is performed at the convex portion of the release surface of the transfer film during coating of the 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 transfer film, the thickness of the liquid crystal compound alignment layer becomes thick.

In order to make the roughness of the mold release surface A into the said range, the following method is mentioned.

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

- When the release surface side layer (surface layer) of a base film contains particle|grains, let it be a particle|grains with a small particle diameter.

- The surface of the roll (casting roll or touch roll) of the side used as a mold release surface is made smooth.

- A flattening coat is provided on the release surface side of the base film.

In addition, in this invention, the "release surface side layer" of a base film means the layer in which a release surface exists among each layer of resin which comprises a base film. Here, also when a base film is a single layer, it may call 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.

- The molten cyclic polyolefin resin is filtered.

· Filter the coating agent to remove foreign matter.

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

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. When particles are included, the lower limit of the content of the surface layer particles is preferably 30 ppm, more preferably 50 ppm. More preferably, it is 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. Further, the upper limit of the thickness of the surface layer is preferably 97%, more preferably 95%, still more preferably 90% with respect to the total thickness of the transfer film.

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 transfer film, the lower limit of the thickness of the intermediate layer is preferably 10%, more preferably 20%, still more preferably 30% with respect to the total thickness of the transfer film. The upper limit is preferably 95%, more preferably 90%.

When the roughness of the surface layer of the transfer film (base film) is high, a flattening coat may be provided. 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.

(Releasable layer)

As long as the obtained base film has peelability with a transcription|transfer material (liquid crystal compound orientation layer), it can be used as a film for transcription|transfer as it is. For adjustment of releasability, you may surface-treat a film. Corona treatment, plasma treatment, etc. are mentioned as surface treatment.

Moreover, you may provide a mold release layer. As a mold release layer, a well-known mold release agent can be used and an alkyd resin, an amino resin, a long-chain acrylic acrylate type, 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. In order to raise the adhesiveness of a base film and a mold release layer, you may surface-treat to a base film. As a surface treatment, said process is mentioned. Moreover, you may perform an easily adhesive coating.

(Roughness on the back side)

Moreover, even if it smoothes the release surface of the film for transcription|transfer of this invention, a fault may generate|occur|produce in a liquid crystal compound orientation layer. It was found that this is because the transfer film is supplied in a rolled state, and the surface and the back are in contact, and the roughness of the back is transferred to the surface (the convex part on the back is transferred to the release layer to form a concave part). In order to protect a liquid crystal compound aligning layer, the film for transcription|transfer which provided the liquid crystal compound aligning layer may bond and roll up 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 by making the roughness of the surface (back surface) of the opposite surface of 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 transfer film of the present invention is preferably 3 nm, more preferably 4 nm, still more preferably 5 nm. If it is less than the above, slipperiness deteriorates, it does not slip smoothly at the time of roll conveyance, the time of winding, etc., and a flaw may become easy to occur. Moreover, the upper limit of SRa of the back surface of the transfer film of this invention becomes like this. Preferably it 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 transfer film of the present invention is preferably 15 nm, more preferably 20 nm, still more preferably 25 nm. The upper limit of SRz on the back surface of the transfer film of the present invention is preferably 1500 nm, more preferably 1200 nm, still more preferably 1000 nm, particularly preferably 700 nm, and most preferably 500 nm. When the above is exceeded, a fault may increase.

The lower limit of the maximum height of the back surface of the transfer film of the present invention (SRy: maximum peak height SRp+, maximum valley depth SRv) of the present invention is preferably 20 nm, more preferably 30 nm, still more preferably 40 nm, particularly preferably For example, it is 50 nm. The upper limit of the maximum height SRy of the back surface of the transfer 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. . When the above is exceeded, a fault may increase.

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

When the roughness of the back surface of the transfer film of the present invention expressed by the above parameters is less than the above range, the film's slipperiness deteriorates, and the film becomes less slippery at the time of conveyance to a roll, winding, etc., and is prone to scratches. have. 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 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, the following method is mentioned.

- Let the roughness of the surface of the roll (casting roll or touch roll) on the side used as a back surface be a specific range.

- Let the back side layer (back side layer) of a base film contain specific particle|grains.

- The intermediate layer of the base film is used to contain particles, and the back side layer (rear layer) is made to contain no particles, so that the thickness is reduced.

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

- When the back side layer (back side layer) of the base film is too smooth, an lubricating coat (particle-containing coat) is provided.

The lower limit of the particle diameter of the back surface layer is preferably 0.005 µm, more preferably 0.01 µm, still more preferably 0.05 µm, and particularly 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. In addition, 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 transfer film.

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 a base film is rough, it is also preferable to provide a leveling 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.

A lubricating coat containing particles may be provided on the back surface. The lubricating coat is effective when the surface side of the base film does not contain particles or when the roughness is insufficient.

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.

When providing such a coat|coat, it is preferable to apply the above-mentioned surface treatment and an easily adhesive coat to a base film.

The cyclic polyolefin-based film can be generally produced by a melt extrusion method. Hereinafter, this method will be briefly described.

In the melt extrusion method, the cyclic polyolefin resin is a uniaxial or biaxial stretching machine, usually (Tg+30) to (Tg+180)°C, preferably (Tg+50) to (Tg+150)°C, particularly preferably (Tg+60) to ( It is heated and melted to Tg+140)°C and extruded from a die onto a casting roll. Here, Tg is the glass transition temperature of cyclic polyolefin resin.

In order to achieve an appropriate surface roughness, it is preferable that the molten resin is filtered from the extruder between the die and the filter to remove coarse particles. The lower limit of the filtration accuracy of the filter to be used is preferably 0.5 µm, more preferably 1 µm. The upper limit of the filtration accuracy of the filter is preferably 100 µm, more preferably 50 µm, still more preferably 25 µm, particularly preferably 20 µm, and most preferably 10 µm. This value is suitably determined according to the particle diameter of the particle|grains to add.

(Roll Roughness)

By adjusting the roughness of the roll, it is possible to adjust the roughness of the surface of the film to be created. For example, the roughness of a preferable roll is demonstrated below about the case where a casting roll is a mold release surface and a touch roll is made into a back surface.

The lower limit of the three-dimensional arithmetic mean surface roughness (SRa) of the casting roll in the case of using the casting roll as a release surface is preferably 1 nm, more preferably 1.3 nm, still more preferably 1.5 nm. The upper limit of the three-dimensional arithmetic mean surface roughness (SRa) of the casting roll in the case of using the casting roll as a release surface is preferably 250 nm, more preferably 200 nm, still more preferably 150 nm, particularly preferably 100 nm, Most preferably, it is 50 nm.

The lower limit of the three-dimensional ten-point average roughness (SRz) of the casting roll in the case of using the casting roll as a mold release surface is preferably 3 nm, more preferably 5 nm, still more preferably 7 nm. The upper limit of the three-dimensional ten-point average roughness (SRz) of the casting roll in the case of using the casting roll as a release surface is preferably 1000 nm, more preferably 700 nm, still more preferably 500 nm, particularly preferably 300 nm, and most Preferably it is 250 nm.

The lower limit of the maximum height (SRy) of the casting roll in the case of using the casting roll as the release surface is preferably 5 nm, more preferably 8 nm, still more preferably 10 nm. The upper limit of the maximum height (SRy) of the casting roll in the case of using the casting roll as the release surface is preferably 1500 nm, more preferably 1000 nm, still more preferably 800 nm, and particularly preferably 600 nm.

The lower limit of the three-dimensional arithmetic mean surface roughness (SRa) of the touch roll in the case of using the touch roll as the back surface is preferably 5 nm, more preferably 10 nm, still more preferably 15 nm. The upper limit of the three-dimensional arithmetic mean surface roughness (SRa) of the touch roll in the case of using the touch roll as the back surface is preferably 500 nm, more preferably 400 nm, still more preferably 300 nm, particularly preferably 250 nm, and most Preferably it is 200 nm.

The lower limit of the three-dimensional ten-point average roughness (SRz) of the touch roll in the case of using the touch roll as the back surface is preferably 20 nm, more preferably 30 nm, still more preferably 40 nm. The upper limit of the three-dimensional ten-point average roughness (SRz) of the touch roll in the case of using the touch roll as the back surface is preferably 2000 nm, more preferably 1500 nm, still more preferably 1200 nm, particularly preferably 1000 nm, most preferably For example, it is 800 nm.

The lower limit of the maximum height (SRy) of the touch roll in the case of using the touch roll as the back surface is preferably 30 nm, more preferably 40 nm, still more preferably 50 nm. Preferably the upper limit of the maximum height (SRy) of a touch roll in the case of using a touch roll as a back surface is 3000 nm, More preferably, it is 2500 nm, More preferably, it is 2000 nm, Especially preferably, it is 1500 nm, Most preferably 1000 nm.

By making the parameter of each roughness of a casting roll and/or a touch roll into the said range, it becomes easy to control the roughness of a base film in an appropriate range.

Generally, there exists the following relationship between film forming conditions and the roughness of a film surface, and the roughness of a roll is decided in consideration of these.

- In the case of the same roughness in a casting roll and a touch roll, the side of the casting roll surface of a film becomes rough.

· The smaller the distance between the die and the casting roll, the greater the roughness of the casting roll surface of the film.

- The roughness of each surface becomes large, so that the position where the molten resin contact|connects a casting roll and the pressing position of a touch roll are close.

· The lower the melt viscosity of the resin, the greater the roughness of each surface.

- The roughness of each surface becomes large, so that the temperature of a casting roll and a touch roll is high.

· The higher the pressing pressure of the touch roll, the larger the roughness of each surface.

It is preferable that the temperature of a casting roll is (Tg-30)-(Tg+30) degreeC, Furthermore, it is (Tg-20)-(Tg+20) degreeC.

It is preferable that the temperature of a touch roll is (Tg-100) - (Tg+30) degreeC, Furthermore, it is (Tg-90) - (Tg+20) degreeC. Moreover, compared with the temperature of a casting roll, it is 0-50 degreeC, Furthermore, it is preferable to set 5-40 degreeC low.

It is preferable that the pressing pressure (linear pressure) of a touch roll is 10-250 kgf/cm, Furthermore, it is 20-200 kgf/cm.

Thereafter, the film is peeled from the casting roll, cooled while passing through the roll, and wound on a core. At the time of winding up, you may give a thickness provision process (knurl process) to both ends.

In the case of coating, the wound film may be set in a coating apparatus, unwound, and coated and dried. In the said film forming process, after peeling a film from a casting roll, you may apply and dry before winding-up, and you may wind up after that.

It is preferable that the air in such a process be air of class 10000 or less, and further, class 1000 or less air through a HEPA filter or the like.

Next, further characteristics of the transfer film of the present invention will be described.

(In-plane retardation of transfer film)

It is preferable that the film for transcription|transfer of this invention has low in-plane retardation. Specifically, 50 nm or less of in-plane retardation of the transfer film of this invention is preferable, More preferably, it is 30 nm or less, More preferably, it is 20 nm or less, Especially preferably, it is 10 nm or less. By making the in-plane retardation of the transfer film into the above range, the alignment state of the liquid crystal compound alignment layer can be inspected by irradiating linearly polarized light in a state in which the liquid crystal compound alignment layer is laminated on the transfer film. For example, when the liquid crystal compound alignment layer is a retardation layer, the 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 the linearly polarized light is received through a polarizing plate in a state of extinction. Thereby, when the phase difference layer has a pinhole-like defect, a defect can be detected as a luminescent point.

The retardation of the transfer film can be obtained by measuring the refractive index and thickness of the biaxial direction, and can also be calculated|required using commercially available automatic birefringence measuring apparatuses, such as KOBRA-21ADH (Oji Keisoku Instruments Co., Ltd.).

In order to make the in-plane retardation of the transfer film within the above range, in the film forming process of the base film, no stretching is performed, or when stretching is performed, methods such as adjusting the stretching ratio in the flow direction and the width direction are mentioned. have.

The lower limit of the haze of the transfer film of the present invention is preferably 0.01%, more preferably 0.1%. If it is less than the above, it may be difficult to realistically achieve the numerical value. The upper limit of the haze of the transfer film of the present invention is preferably 3%, more preferably 2.5%, still more preferably 2%, particularly preferably 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 as designed. In addition, light leakage may occur due to diffuse reflection at the time of inspection of the retardation layer, making it difficult to inspect.

The lower limit of the antistatic property (surface resistance) of the transfer film of the present invention is preferably 1×10 ⁵ Ω/□, more preferably 1×10 ⁶ Ω/□. It may be less than the above, and further effects may not be obtained. In addition, the upper limit of the antistatic property (surface resistance) of the transfer film 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 transfer film, providing an antistatic coating layer on the lower or opposite surface of the release layer, or adding an antistatic agent to the release layer, etc. It may be within the above range.

Examples of the antistatic agent added to the antistatic coating layer, the release layer, or the transfer film include conductive polymers such as polyaniline and polythiophene, ionic polymers such as polystyrene sulfonate, and conductive polymers such as tin-doped indium oxide and antimony-doped tin oxide. and particulates.

You may provide a release layer in the 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.

(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 film of the present invention are laminated. The liquid crystal compound alignment layer needs to be coated and orientated on the transfer film. 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 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 a 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 coating methods, such as a gravure coating method, a die coating method, a bar coating method, and an applicator method, and a printing method, such as a flexographic method, are employ|adopted.

The range of 30 degreeC - 170 degreeC of heat-drying temperature 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 the drying temperature is too high, the transfer film may be stretched by heat or the thermal shrinkage may become large, so that the optical function as designed cannot be achieved, or planarity may deteriorate. 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 the angle can be matched by adjustment of the angle of a rubbing roller and a film, and adjustment of the conveyance speed of a film, and rotation speed of a roller.

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

(optical orientation control layer)

The photo-alignment control layer refers to 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 a 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 the 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 was 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 mentioned 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.

The polarized light may be irradiated from the direction of the photo-alignment control layer surface before orientation, or the method of irradiating the transfer film through the transfer film surface direction.

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 film for 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 transfer film after coating is guided with a warm air dryer, 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 on the basis of 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 on a 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 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.

A retardation layer is provided by drying, heating, and hardening after coating the composition coating material for retardation layer on the release surface or orientation control layer of the film for transcription|transfer.

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 transfer film and transferred to an object, and a plurality of retardation layers provided on one transfer film You may prepare a seed and transfer these to an object in turn.

Moreover, a polarizing layer and retardation layer may be provided on one transfer film, and this may be transcribe|transferred 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 a transfer film together with a retardation layer or a polarizing layer, and may be transcribe|transferred to an 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 the film for transcription|transfer, 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 a process of bonding a polarizing plate and the liquid crystal compound alignment layer surface of the liquid crystal compound alignment layer transfer laminate of this invention to form an intermediate|middle laminated body, and transfer from an intermediate laminated body The process of peeling a film is included.

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 a film to be used. 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 on which the λ/4 layer and the transfer film were laminated onto the polarizing plate. Specifically, the polarizing plate and the lambda / 4 layer surface of the transfer laminate are bonded to form an intermediate laminate, and the transfer 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.

In the case of using a polyester high retardation film, the angle between the transmission axis of the polarizer and the slow axis of the polyester high retardation film is 30 to 60 for the purpose of preventing blackout or coloring when viewing an image while wearing polarized sunglasses. The range of degrees is preferable, Furthermore, the range of 35-55 degrees is preferable. For reduction of iridescence or the like when observed with the naked eye from an oblique direction with a shallow angle, the angle between the transmission axis of the polarizer and the slow axis of the polyester hyperretardation film is 10 degrees or less, and further 7 degrees or less or 80 to 100 degrees, more preferably 83 to 97 degrees.

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, the absorption axis of the polarizer is generally in the longitudinal direction of the long polarizer film. When providing a layer, it is preferable to orientate a liquid crystal compound so that it may become the said range with respect to the longitudinal direction or the perpendicular|vertical direction of a length of a long transfer film. 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 transfer film, and this is transferred onto a polarizer.

- A λ/4 layer, a λ/2 layer, and a polarizing layer are provided in this order on the transfer film, 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 transfer film, transferring this to an object, and further transferring the λ/4 layer thereon can be adopted.

In addition, in the case of laminating a 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 a film, and further adding a λ/4 layer or a λ/2 layer on this Various methods, such as a method of providing a layer and a ?/4 layer and transferring it, can be employed.

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.

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) Film thickness (each layer thickness)

After embedding a film in an epoxy resin, the cross section was cut out, it observed with the optical microscope, and calculated|required the thickness.

(4) Inspection of defects in retardation layer

What arranged the rubbing process orientation control layer or photo-alignment control layer as an orientation control layer between the 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 transfer film was cut out to 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. Then, the surface of the obtained film|membrane was processed with the rubbing roll wound with raised nylon cloth, and the transfer film 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 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 film was cut into A4 size, and the paint for the photo-alignment control layer of the above composition was applied to the release layer surface 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 transfer film 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.

(5) Inspection of defects after overlapping 1

Two samples for inspection using the above rubbing treatment orientation control layer were prepared, the phase difference layer installation surface of the first sample and the opposite surface of the second sample 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 (4) retardation layer fault, and it was inspected.

(6) Inspection of defects after overlapping 2

In the 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 Example 2 having the small roughness of the release surface is used. The influence of the roughness of the back surface of the sample for inspection using the optical orientation control layer of another Example and a comparative example was investigated.

Specifically, the retardation layer installation surface of the inspection sample in which the 1/4 wavelength layer is provided on the photo-alignment control layer of Example 2 is superimposed on the opposite surface of the inspection sample using the photo-alignment control layer of Examples and Comparative Examples Thus, a weight of 1 kg/cm 2 was applied for 10 minutes. The fault of the retardation layer of this sample (the test sample of Example 2) was carried out similarly to the test|inspection of the (4) retardation layer fault, and was inspected.

Preparation of films A1 to A7

After drying, a thermoplastic norbornene resin (ZEONOR1420R manufactured by Nippon Zeon Co., Ltd.) was supplied to an extruder, melted at 215° C., and filtered through a stainless steel sintered filter medium (nominal filtration precision of 10 μm particles 95% cut). , extruded into a sheet form on a casting roll. From the opposite surface of the resin wound on the casting roll, the resin was pressed against the casting roll with a touch roll. The cooled film was peeled off from the casting roll and wound up in roll shape. The surface roughness of a casting roll and a touch roll is as showing in Table 1. In addition, films A1 to A4 and A7 were produced with a touch line pressure of 200 Kgf/cm, and A5 and A6 were prepared with a touch line pressure of 200 Kgf/cm.

[Table 1]

Example 1

Film A1 was used, the casting roll surface was made into a mold release layer surface, and the above-mentioned physical property evaluation was performed. Table 2 shows the evaluation results.

Example 2

Film A2 was used, the casting roll surface was made into a mold release layer surface, and the above-mentioned physical property evaluation was performed. Table 2 shows the evaluation results.

Example 3

Film A3 was used, the casting roll surface was made into a mold release layer surface, and the above-mentioned physical property evaluation was performed. Table 2 shows the evaluation results.

Example 4

Film A2 was used, the touch roll surface was made into a mold release layer surface, and evaluation of the above-mentioned physical property was performed. Table 2 shows the evaluation results.

Example 5

Film A4 was used, the casting roll surface was made into a mold release layer surface, and the above-mentioned physical property evaluation was performed. Table 2 shows the evaluation results.

Example 6

Film A5 was used, the casting roll surface was made into a mold release layer surface, and the above-mentioned physical property evaluation was performed. Table 2 shows the evaluation results.

Example 7

Film A6 was used, the casting roll surface was made into a mold release layer surface, and the above-mentioned physical property evaluation was performed. Table 2 shows the evaluation results.

Example 8

Film A2 was used, the casting roll surface was corona-treated, and the coating agent of the following composition was apply|coated thereon as a release layer (surface leveling coating layer), and it dried in 150 degreeC for 3 minutes in heating oven. The thickness of the coating layer was 2 µm.

(coat agent)

・Melamine crosslinked alkyl-modified alkyd resin (manufactured by Hitachi Kasei Polymers Co., Ltd.: 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 was used, after filtering with a 2 micrometer filter.

The surface on which the surface-planarization coating layer was formed was used as the release layer surface, and the above-described physical properties were evaluated. Table 2 shows the evaluation results.

Example 9

Film A7 is used, the touch roll surface is corona-treated, and a coating liquid of the following composition as a back surface lubricating coating layer is applied thereon so that the application amount after drying is 0.07 g/m 2 , followed by induction with a dryer, 80 ° C. dried for 30 seconds.

(coating liquid)

·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, MP 2040, average particle size 200 nm, solid content concentration 40 mass%)

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

The above-described physical properties were evaluated using the casting roll surface of the obtained film as the release layer surface. Table 2 shows the evaluation results.

Example 10

Film A4 was used, the touch roll surface was corona-treated, and on it, as an antistatic layer, Peltron C-4402 (antimony-doped tin oxide particles) was coated with MEK at a solid content concentration of 5%, and then in a heating oven at 80 ° C It was dried for 3 minutes. The thickness of the coating layer was 200 nm. Further, the surface resistance was 7.5×10 ⁷ Ω/□. Said physical property was evaluated by making the surface of the capping roll of the obtained film into the surface of a mold release layer. Table 2 shows the evaluation results.

Example 11

Dried thermoplastic norbornene resin (ZEONOR1420R manufactured by Nippon Zeon Corporation) and silica particles having a particle diameter of 25 µm (KE-P250 manufactured by Nippon Shokubai) were added to a twin-screw extruder so that the solid content became 1000 ppm, and pellets were added. got 1

The dried pellets 1 were supplied to the extruder 1, and the dried thermoplastic norbornene resin (ZEONOR1420R manufactured by Nippon Zeon Corporation) was supplied to the extruder 2, respectively, and the filter media of the stainless steel sintered compact (nominal filtration accuracy 10 µm particle 95% cut) was filtered, and laminated in a two-type two-layer merging block, and extruded in a sheet form on a casting roll as in the film A1 to obtain a film B1. At this time, it was made so that resin on the side of the extruder 2 became a casting roll surface.

The above-described physical properties were evaluated using the casting roll surface of the obtained film as the release layer surface. Table 2 shows the evaluation results.

Example 12

Dried thermoplastic norbornene resin (ZEONOR1420R manufactured by Nippon Zeon Co., Ltd.) and silica particles having a particle size of 100 nm (KE-P10 manufactured by Nippon Shokubai) were added to a twin-screw extruder so that the particle content was 600 ppm by solid content, and pellet 2 got

Except having supplied the pellet 2 to the extruder 2, it carried out similarly to Example 11, and obtained the film B2.

The above-described physical properties were evaluated using the casting roll surface of the obtained film as the release layer surface. Table 2 shows the evaluation results.

Comparative Example 1

Film A3 was used, the touch roll surface was made into a mold release layer surface, and evaluation of the above-mentioned physical property was performed. Table 2 shows the evaluation results.

[Table 2]

As is clear from Table 2, all of Examples 1 to 12 in which the surface roughness of the release surface satisfies the requirements of the present invention had remarkably few defects in defect evaluation, and the occurrence of light leakage in the form of pinholes and scratches was sufficiently suppressed. . Moreover, in Examples 1-6 and 8-12, since the surface roughness of the back surface is also suppressed to a low level, during fault evaluation, the faults 1 and 2 after superposition|polymerization are also remarkably few, and generation|occurrence|production of the light leakage of a pinhole shape or a flaw shape is sufficient. was restrained On the other hand, the comparative example 1 with too large surface roughness of a mold release surface had remarkably many faults in fault evaluation, and was not able to fully suppress generation|occurrence|production of the light leakage of a pinhole shape or a flaw shape.

In addition, although not shown in Table 1, when the in-plane retardation (Re) of the base film used in Examples and Comparative Examples was obtained, any base film was 10 nm or less, sufficiently low, and the liquid crystal compound alignment layer was laminated on the transfer film. It was a level at which the alignment state of the liquid crystal compound alignment layer could be inspected by irradiating linearly polarized light in a state of being

The specific measurement procedure of in-plane retardation is as follows. That is, from the base film used by the Example and the comparative example, the longitudinal direction of 4 cm x 2 cm was cut out so that a flow direction might become a long side, and it was set as the sample for a measurement. About this sample, the refractive index (flow direction nx, width direction ny) was measured using the Abbe refractometer (The Atago company make, NAR-4T, measurement wavelength 589 nm). In the width direction of the film, 5 points (center part, both ends, the middle part between the center part and the edge part) are measured, and the in-plane retardation is obtained from the product ((nx-ny)×d) with the thickness d (nm) of the film as the average. I found Dation (Re).

Industrial Applicability

In the liquid crystal compound alignment layer transfer film of the present invention, a film whose surface roughness is controlled within a specific range is used as a film for transfer of a retardation layer or a polarizing layer, so the alignment state of the liquid crystal compound in the retardation layer or the polarizing layer is The retardation can be set as designed, and a retardation layer or a polarizing layer (liquid crystal compound alignment layer) with reduced occurrence of defects such as pinholes 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 (4)

A cyclic polyolefin-based film for transferring a liquid crystal compound alignment layer to an object, wherein the surface roughness (SRa) of a release surface of the film is 1 nm or more and 30 nm or less. used film. The method of claim 1,
A liquid crystal compound alignment layer transfer film, characterized in that the 10-point surface roughness (SRz) of the release surface of the film is 5 nm or more and 200 nm or less. A laminate in which a liquid crystal compound alignment layer and a film are laminated, wherein the film is the film according to claim 1 or 2, wherein the liquid crystal compound alignment layer transfer laminate. A liquid crystal compound alignment characterized by including a step of bonding a polarizing plate and a surface of the liquid crystal compound alignment layer of the laminate according to claim 3 to form an intermediate laminate, and a step of peeling a film from the intermediate laminate. A method for manufacturing a layer-laminated polarizing plate.