TWI824046B - Alignment film for transfer of liquid crystal compound alignment layer, laminate for transfer of liquid crystal compound alignment layer, manufacturing method of liquid crystal compound alignment layer laminated polarizing plate, and inspection method of laminate for transfer of liquid crystal compound alignment layer - Google Patents

Abstract

The present invention provides a transfer film that is laminated on the transfer film while using a stretch film such as polyester that is cheap and has excellent mechanical strength as a transfer film for transferring a liquid crystal compound alignment layer. The state can also be used to evaluate the alignment state of the liquid crystal compound alignment layer provided on the transfer film; a transfer film that can reduce the problem of deviation in the alignment direction of the transferred liquid crystal compound alignment layer to meet the requirements The designed alignment transfer liquid crystal compound alignment layer can prevent the problem of light leakage in the display; or a transfer film can effectively prevent the haze of the film from rising or the film in the step of forming the liquid crystal compound alignment layer on the film. Foreign matter occurs in the liquid crystal compound, forming a liquid crystal compound alignment layer that conforms to the designed alignment. It is an alignment film used to transfer a liquid crystal compound alignment layer to an object. The characteristic is that the angle between the alignment direction of the alignment film and the flow direction of the alignment film or the direction orthogonal to the flow direction is based on the width of the film. In the direction, the maximum value among the values measured at five locations at the two ends, the center part, and the middle part between the center part and both ends at a point 5 cm inside from each end part is 14 degrees or less. It is an alignment film used to transfer a liquid crystal compound alignment layer to an object. The characteristics are: the thermal shrinkage rate of the alignment film at 150°C for 30 minutes in the flow direction and the thermal shrinkage rate of the alignment film at 150°C for 30 minutes in the direction orthogonal to the flow direction. The difference in thermal shrinkage rate per minute is less than 4%. It is an aligned polyester film used to transfer an alignment layer of a liquid crystal compound to an object. It is characterized by the precipitation of ester cyclic terpolymer on the surface of the release surface of the aligned polyester film after heating at 150°C for 90 minutes. The amount is less than 1.0mg/ ^m2 .

Description

Alignment film for transfer of liquid crystal compound alignment layer, laminate for transfer of liquid crystal compound alignment layer, manufacturing method of liquid crystal compound alignment layer laminated polarizing plate, and inspection method of laminate for transfer of liquid crystal compound alignment layer

The present invention relates to a transfer film used for transferring a liquid crystal compound alignment layer. More specifically, when manufacturing a polarizing plate or a phase difference plate such as a circular polarizing plate laminated with a phase difference layer including a liquid crystal compound alignment layer, or when manufacturing a polarizing plate having a polarizing layer including a liquid crystal compound alignment layer, The transfer film used to transfer the liquid crystal compound alignment layer.

Conventionally, in image display devices, in order to reduce reflection of external light, a circular polarizing plate is disposed on the panel surface on the viewer side of the image display panel. This circular polarizing plate is composed of a laminate of a linear polarizing plate and a phase difference film such as λ/4. The linear polarizing plate converts the light directed outside the panel surface of the image display panel into linearly polarized light, and then uses λ /4 etc. phase difference film converts into circularly polarized light. When external light caused by circular polarization is reflected on the surface of the image display panel, the rotation direction of the polarizing surface is reversed. On the contrary, this reflected light is converted by a phase difference film such as λ/4 into a linear polarizing plate. The linearly polarized light in the direction of the light blocking is then blocked by the linear polarizing plate, thus suppressing the emission to the outside. In this manner, a circularly polarizing plate is used in which a retardation film such as λ/4 is bonded to a polarizing plate.

As the retardation film, a simple phase difference film such as a cyclic olefin (see Patent Document 1), polycarbonate (see Patent Document 2), or a stretched film of triacetyl cellulose (see Patent Document 3) is used. Furthermore, as the retardation film, a laminate having a retardation layer made of a liquid crystal compound on a transparent film is used (see Patent Documents 4 and 5). As described above, when a retardation layer made of a liquid crystal compound is provided, the liquid crystal compound can be transferred well.

In addition, a method of forming a retardation film by transferring a retardation layer made of a liquid crystal compound to a transparent film is known from Patent Document 6 and the like. It is also known to use such a transfer method to provide a retardation layer made of a liquid crystal compound such as λ/4 on a transparent film to form a λ/4 film (see Patent Documents 7 and 8).

Among these transfer methods, various substrates for transfer are introduced, and among them, transparent resin films such as polyester, triacetyl cellulose, and cyclic polyolefin are often exemplified. Unstretched films of triacetyl cellulose, cyclic polyolefin, etc. have no birefringence and are preferable in that the state of the retardation layer can be checked (evaluated) with the retardation layer installed on the film base material. , but these films are not only expensive, but also have poor mechanical strength when thinning the film, so they may not be the most suitable.

On the other hand, although a stretched film has better mechanical strength than an unstretched film and is suitable as a film base material for transfer, it is difficult to evaluate the retardation layer because it has birefringence. In particular, biaxially stretched polyester films are relatively cheap and have excellent mechanical strength and heat resistance. In these aspects, they are very suitable as film substrates for transfer. However, polyester films have large birefringence. Therefore, it is difficult to evaluate the retardation layer in a state where a liquid crystal compound alignment layer (retardation layer) is laminated on a film base material.

Therefore, when evaluating a retardation layer in a stretched film, it is necessary to transfer it to an object (another transparent resin film, a polarizing plate, etc.) and then evaluate it, or to peel off the retardation layer and evaluate only the retardation layer, or to transfer it. to glass, etc. for evaluation. In the method of evaluating after transferring to the target object, if there is a problem with the retardation layer, including normal products such as polarizing plates, they must be treated as non-standard products, resulting in poor productivity. The method of peeling off the retardation layer for evaluation has the problem that it cannot be evaluated when the retardation layer is thin. In addition, in the method of peeling and evaluating or the method of transferring to glass, it becomes a sample extraction and evaluation, and full evaluation cannot be performed.

In addition, although stretched films have better mechanical strength than unstretched films and are suitable as film substrates for transfer, problems often occur that the alignment direction of the transferred retardation layer does not conform to the designed alignment direction and often deviates from it. . Furthermore, if such a polarizing plate with a phase difference deviating from the designed alignment direction is used in a display, problems such as light leakage may occur. In particular, stretched polyester films such as biaxially stretched polyester films are relatively cheap and have excellent mechanical strength and heat resistance. In these aspects, they are very suitable as film substrates for transfer. However, compared with polyester In thin films, the deviation of the alignment direction and the resulting light leakage problem are particularly significant.

In addition, polyester films such as biaxially stretched polyester films are relatively cheap and have excellent mechanical strength and heat resistance. In these aspects, they are very suitable as film substrates for transfer. However, if polyester is When a film is used as a film base material for transfer, there is a problem that the haze of the film increases or foreign matter is generated in the film during the step of forming a retardation layer (liquid crystal compound alignment layer) thereon to produce a laminate. Furthermore, due to such increased haze or foreign matter, the polarization system is disturbed during ultraviolet irradiation for controlling the alignment of the liquid crystal compound, and there is a problem that the alignment direction cannot be aligned with the design.

Also known is 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. However, this method is also known. Have the same problem as above [Prior technical literature] [Patent Document]

[Patent Document 1] Japanese Patent Application Publication No. 2012-56322 [Patent Document 2] Japanese Patent Application Publication No. 2004-144943 [Patent Document 3] Japanese Patent Application Publication No. 2004-46166 [Patent Document 4] Japanese Patent Application Publication No. 2006-243653 [Patent Document 5] Japanese Patent Application Publication No. 2001-4837 [Patent Document 6] Japanese Patent Application Laid-Open No. 4-57017 [Patent Document 7] Japanese Patent Application Publication No. 2014-071381 [Patent Document 8] Japanese Patent Application Publication No. 2017-146616

[Problem to be solved by the invention]

The present invention was completed against the background of the problems of such conventional technologies. That is, the first object of the present invention is to provide a transfer film that is a laminated film while using an inexpensive stretched film such as polyester and excellent mechanical strength as a transfer film for transferring a liquid crystal compound alignment layer. The state on the transfer film can also be used to evaluate the alignment state of the liquid crystal compound alignment layer (retardation layer or polarizing layer) provided on the transfer film.

The second object of the present invention is to provide a transfer film that can reduce the amount of transfer while using a cheap and mechanically strong stretched film such as polyester as a transfer film for transferring a liquid crystal compound alignment layer. To solve the problem of deviation of the alignment direction of the liquid crystal compound alignment layer, the problem of light leakage in the display can be prevented by transferring the retardation layer or polarizing layer in accordance with the designed alignment.

A third object of the present invention is to provide a transfer film that can effectively prevent In the step of forming a retardation layer or polarizing layer (liquid crystal compound alignment layer) on the film, the haze of the film increases or foreign matter occurs in the film, forming a retardation layer or polarizing layer (liquid crystal compound alignment layer) that conforms to the designed alignment. . [Means used to solve problems]

In order to achieve the first objective, the present inventors concentrated on examination and found that by using an alignment film, the angle between the alignment direction and the flow direction of the alignment film or the direction orthogonal to the flow direction becomes the largest. , is also controlled below a specific angle, the above-mentioned conventional problems do not occur, and the retardation phase can be favorably evaluated even when a liquid crystal compound alignment layer is laminated on the alignment film.

In order to achieve the second objective, the inventor examined the reason why the alignment direction of the transferred retardation layer or polarizing layer did not conform to the designed alignment direction when using a conventional stretched film as a film base material for transfer. As a result, they found that due to the heat treatment when forming a retardation layer or a polarizing layer by aligning the liquid crystal compound on the stretched film as the base material, the stretched film as the base material undergoes thermal shrinkage to a certain extent, but the degree of this thermal shrinkage is The two orthogonal directions of the stretched film are quite different, so distortion occurs in the base film after heat shrinkage, and this distortion is related to the alignment direction of the retardation layer or polarizing layer formed on the base film. Causes adverse effects, so the alignment direction of the retardation layer or polarizing layer deviates from the designed alignment direction. Then, the present inventors devoted themselves to examining methods to effectively prevent this distortion of the base film, and found that the alignment film as the base film can be used even in its flow direction (MD direction) and in the direction orthogonal to the flow direction. (TD direction), and there is a deviation in the thermal shrinkage of the film. By controlling the difference within a specific range, the above-mentioned conventional problems will not occur, and the alignment transfer phase difference can be matched to the design. layer or polarizing layer to prevent light leakage.

In order to achieve the third object, the present inventors examined that when a conventional stretched film is used as a film base material for transfer, during the step of forming a retardation layer or a polarizing layer (liquid crystal compound alignment layer) on the film, the haze of the film increases or The reason for the occurrence of foreign matter in the film. As a result, it was found that the polyester resin constituting the polyester film inevitably contains an ester cyclic trimer (oligomer) as a by-product of the reaction during polymerization during the manufacturing process. Therefore, the polyester film was used as a conversion material. When a base film is used for printing, due to the heat treatment in the step of coating a liquid crystal compound on it and heating it to form a liquid crystal compound alignment layer (retardation layer or polarizing layer), these oligomers are precipitated into the base film. surface, resulting in increased haze or the occurrence of foreign matter. Then, the present inventors concentrated on examining methods to effectively prevent such an increase in haze or the generation of foreign matter during heat treatment of an aligned polyester film for transfer, and found that by using a polyester film, oligomer precipitation If the amount is controlled within a specific range, the above-mentioned conventional problems will not occur, and a retardation layer or polarizing layer (liquid crystal compound alignment layer) that conforms to the designed alignment can be formed.

That is, the invention for achieving the first object has the following structures (1) to (6). (1) An alignment film for transferring a liquid crystal compound alignment layer. It is an alignment film used to transfer a liquid crystal compound alignment layer to an object. It is characterized by: the alignment direction of the alignment film is consistent with the flow direction of the alignment film or is consistent with the flow. The angle between the directions orthogonal to each other is defined as 5 positions in the width direction of the film, 5 cm inside from each end, the two ends, the center, and the middle part between the center and both ends. The maximum value among the measured values is 14 degrees or less. (2) The alignment film for transferring a liquid crystal compound alignment layer as described in (1), wherein the angle difference between the alignment angles of the alignment film in the width direction is 7 degrees or less. (3) The alignment film for transferring the liquid crystal compound alignment layer as described in (1) or (2), wherein the alignment film is a polyester film. (4) A laminate for transferring a liquid crystal compound alignment layer, which is a laminate in which a liquid crystal compound alignment layer and an alignment film are laminated, characterized in that the alignment film is as described in any one of (1) to (3) Alignment film. (5) A method for manufacturing a liquid crystal compound alignment laminated polarizing plate, characterized by including the steps of bonding the polarizing plate and the liquid crystal compound alignment layer of the laminated body as described in (4) to form an intermediate laminated body, and laminating the intermediate laminated body. Steps to physically peel off the alignment film. (6) A method for inspecting a laminate for transferring a liquid crystal compound alignment layer, which is a method for inspecting the alignment state of the liquid crystal compound alignment layer in the laminate described in (4), which is characterized by including: The alignment direction of the film, or linear polarization parallel to the direction orthogonal to the alignment direction, or parallel to the flow direction of the alignment film, or parallel to the direction of electric field vibration in the direction orthogonal to the flow direction, is emitted from the alignment film surface of the laminate To irradiate, the step of receiving light on the alignment layer side of the liquid crystal compound.

The invention for achieving the second object has the following structures (1) to (6). (1) An alignment film for transferring a liquid crystal compound alignment layer. It is an alignment film used to transfer a liquid crystal compound alignment layer to an object. It is characterized by: the thermal shrinkage rate of the alignment film at 150°C for 30 minutes in the direction of flow. The difference between the thermal shrinkage rate of the alignment film at 150°C for 30 minutes in the direction orthogonal to the flow direction is less than 4%. (2) The alignment film for transferring a liquid crystal compound alignment layer as described in (1), wherein the thermal shrinkage rate at 150°C for 30 minutes in a direction of 45 degrees with respect to the flow direction of the alignment film is the same as the flow direction of the alignment film. In terms of direction, the difference between the thermal shrinkage rates at 150°C for 30 minutes in the direction of 135 degrees is less than 4%. (3) The alignment film for transferring the liquid crystal compound alignment layer as described in (1) or (2), wherein the alignment film is a polyester film. (4) A laminate for transferring a liquid crystal compound alignment layer, which is a laminate in which a liquid crystal compound alignment layer and an alignment film are laminated, characterized in that the alignment film is as described in any one of (1) to (3) Alignment film. (5) A method for manufacturing a liquid crystal compound alignment laminated polarizing plate, characterized by including the steps of bonding the polarizing plate and the liquid crystal compound alignment layer of the laminated body as described in (4) to form an intermediate laminated body, and laminating the intermediate laminated body. Steps to physically peel off the alignment film. (6) A method for inspecting a laminate for transferring a liquid crystal compound alignment layer, which is a method for inspecting the alignment state of the liquid crystal compound alignment layer in the laminate described in (4), which is characterized by including: The alignment direction of the film, or linear polarization parallel to the direction orthogonal to the alignment direction, or parallel to the flow direction of the alignment film, or parallel to the direction of electric field vibration in the direction orthogonal to the flow direction, is emitted from the alignment film surface of the laminate To irradiate, the step of receiving light on the alignment layer side of the liquid crystal compound.

The invention for achieving the third object has the following structures (1) to (6). (1) An aligned polyester film for transferring a liquid crystal compound alignment layer. It is an alignment polyester film used to transfer a liquid crystal compound alignment layer to an object. It is characterized by: the alignment polyester film after heating at 150°C for 90 minutes. The amount of ester cyclic terpolymer precipitated on the release surface of the ester film is 1.0 mg/m ² or less. (2) The aligned polyester film for transferring a liquid crystal compound alignment layer as described in (1), wherein the content of the ester cyclic terpolymer in the polyester resin constituting the release surface side layer of the aligned polyester film is 0.7 mass. %the following. (3) The aligned polyester film for transferring a liquid crystal compound alignment layer as described in (1) or (2), wherein a coating layer for preventing the precipitation of ester cyclic trimer is provided on the release surface of the aligned polyester film. (4) A laminate for transferring a liquid crystal compound alignment layer, which is a laminate in which a liquid crystal compound alignment layer and an alignment polyester film are laminated, and is characterized in that: the alignment polyester film is any one of (1) to (3) An aligned polyester film of record. (5) A method for manufacturing a liquid crystal compound aligned laminated polarizing plate, which is characterized by including the steps of bonding the polarizing plate and the liquid crystal compound alignment layer of the laminated body as described in (4) to form an intermediate laminated body, and laminating the intermediate laminated body. Steps for stripping aligned polyester film. (6) A method for inspecting a laminate for transferring a liquid crystal compound alignment layer, which is a method for inspecting the alignment state of the liquid crystal compound alignment layer in the laminate described in (4), which is characterized by including: Linearly polarized light parallel to the alignment direction of the polyester film, or parallel to the direction orthogonal to the alignment direction, or parallel to the flow direction of the aligned polyester film, or parallel to the electric field vibration direction in the direction orthogonal to the flow direction, is emitted from the laminate The step of irradiating the aligned polyester film side and receiving light on the alignment layer side of the liquid crystal compound. [Effects of the invention]

According to the first invention, an alignment film in which a liquid crystal compound alignment layer (retardation layer or polarizing layer) provided on the alignment film is laminated on the alignment film while using a stretched film such as polyester that is cheap and has excellent mechanical strength. The status of status, etc. can also be evaluated.

According to the second invention, a retardation layer or a polarizing layer can be transferred in a designed orientation while using a stretch film such as polyester that is cheap and has excellent mechanical strength, thereby preventing light leakage in the display.

According to the third invention, it is possible to effectively prevent an increase in haze or the occurrence of foreign matter during heat treatment of the film while using a stretched film such as polyester which is cheap and has excellent mechanical strength, so that a retardation layer with an alignment according to the design can be formed. Or polarizing layer (liquid crystal compound alignment layer).

[Form used to implement the invention]

The alignment film of the first invention is used to transfer the alignment layer of the liquid crystal compound to the target object (other transparent resin films, polarizing plates, etc.). It is characterized by: the alignment direction of the alignment film is consistent with the flow direction of the alignment film or is consistent with the flow. The angle between orthogonal directions is less than 14 degrees at the maximum point.

The alignment film of the second invention is used to transfer the liquid crystal compound alignment layer to the target object (other transparent resin films, polarizing plates, etc.). The characteristic is: the alignment film is heated at 150°C in the flow direction (MD direction) for 30 minutes. The difference between the thermal shrinkage rate and the thermal shrinkage rate of the alignment film at 150°C for 30 minutes in the direction orthogonal to the flow direction (TD direction) is less than 4%.

The aligned polyester film of the third invention is used to transfer the liquid crystal compound alignment layer to the target object (other transparent resin films, polarizing plates, etc.), and its characteristics are: the aligned polyester film heated at 150°C for 90 minutes The precipitation amount of ester cyclic terpolymer on the surface of the release surface is 1.0 mg/m ² or less. In the following, the aligned polyester film may be simply referred to as an alignment film. In addition, when there is an oligomer barrier coating, a release layer, a planarization coating, an easy-slip coating, an antistatic coating, etc., which will be described later, a layer including these is called an aligned polyester film or Alignment film.

The resin used for the alignment film is preferably one with birefringence, more preferably polyester, polycarbonate, polystyrene, polyamide, polypropylene, cyclic polyolefin, triacetyl cellulose, and further preferably Polyester is preferred, and polyethylene terephthalate is particularly preferred.

The alignment film system can be a single layer in composition or a plurality of co-extruded layers. When there are multiple layers, examples include surface layer (layer A on the release surface)/back layer (B), or A/intermediate layer (C)/A (layer on the release surface and the back layer are the same), A/C/B And so on.

When the film is stretched, it does not matter whether it is uniaxial stretching, weak biaxial stretching (stretching in the biaxial direction, but one of the directions is weak), or biaxial stretching. However, it can be stretched in a wide direction in the width direction. The range makes the alignment direction a fixed plane, preferably a uniaxial extension or a weak biaxial extension. In the case of weak biaxial extension, it is better to set the main alignment direction as the extension direction of the rear segment. In the case of uniaxial stretching, the stretching direction may be the flow direction of film production (longitudinal) or the direction orthogonal thereto (transverse). The biaxial stretching can be simultaneous biaxial stretching or sequential biaxial stretching. The longitudinal extension is preferably the extension caused by different roller groups with different speeds, and the transverse extension is preferably the tenter extension.

The alignment film for transfer is industrially supplied as a roll on which the film is wound. The lower limit of the roll width is preferably 30cm, more preferably 50cm, further preferably 70cm, particularly preferably 90cm, and most preferably 100cm. The upper limit of the roll width is preferably 5000cm, more preferably 4000cm, and further preferably 3000cm.

The lower limit of the drum length is preferably 100m, more preferably 500m, and further preferably 1000m. The upper limit of the drum length is preferably 100000m, more preferably 50000m, and further preferably 30000m.

Generally speaking, a polarizer is used in which polyvinyl alcohol is stretched in the flow direction of the film to absorb dichroic dyes such as iodine or organic compounds. The extinction axis (absorption axis) of the polarizer becomes the flow direction of the film. . In the case of a circularly polarizing plate, as a retardation layer, the slow axis (alignment direction) of the λ/4 layer is stacked at an angle of 45 degrees to the extinction axis, or the λ/4 layer and the λ/2 layer are stacked in an oblique direction (10~ 80 degrees) medium accumulation layer. In addition, the optical compensation layer used in a liquid crystal display is also stacked in an oblique direction with respect to the extinction axis of the polarizer.

Therefore, the alignment state of the retardation layer can be changed into elliptically polarized light by, for example, irradiating linearly polarized light with a vibration direction parallel or perpendicular to the flow direction of the film from the alignment film side for transfer to the retardation layer. The light passes through a light-receiving side retardation plate for returning elliptically polarized light to linearly polarized light and a light-receiving side polarizing plate installed in a direction that does not pass the linearly polarized light returned by the retardation plate, and is inspected (evaluated) by using a light-receiving element. ). For the retardation layer provided on the alignment film for transfer, when the phase difference and alignment direction meet the design, if the light that becomes linearly polarized and passes through the light-receiving side retardation plate is in an extinction state, it can be seen that the retardation layer meets the design. Phase difference layer. On the contrary, if there is light leakage, it can be seen that the design is deviated from the design.

However, when the alignment direction of the alignment film for transfer deviates from being parallel (MD) or perpendicular (TD) to the flow direction of the alignment film, the linear polarization system passing through the alignment film for transfer becomes elliptical polarization, causing light leakage and phase difference. Correct evaluation of layers becomes difficult. The present invention makes it possible to accurately evaluate the retardation layer by suppressing this deviation to a minimum.

The lower limit of the angle (maximum position) between the MD or TD of the alignment film for transfer of the present invention and the alignment direction is preferably 0 degrees. In addition, the upper limit of the angle between the MD or TD of the alignment film for transfer of the present invention and the alignment direction is preferably 14 degrees, more preferably 7 degrees, further preferably 5 degrees, and particularly preferably 4 degrees. , the best is 3 degrees. If it exceeds the above, it becomes difficult to evaluate the alignment state of the retardation layer (liquid crystal compound alignment layer).

The lower limit of the angle difference of the alignment angle across the full width (width direction) of the alignment film for transfer of the present invention is preferably 0 degrees. In addition, the upper limit of the angle difference between the alignment angles of the alignment film for transfer of the present invention over the full width is preferably 7 degrees, more preferably 5 degrees, further preferably 3 degrees, and particularly preferably 2 degrees. If it exceeds the above, it will become difficult to evaluate the alignment state of the retardation layer (liquid crystal compound alignment layer) in the width direction.

When extending in the TD direction in the tenter, the shrinkage force of the film acts in the MD direction in the stretching zone or heat setting zone. Although the ends of the film are fixed with clamps, since the central part is not fixed, bowing phenomena (bowing phenomena) caused by bow delay occur at the tenter outlet. This system becomes a distortion of the alignment direction.

In order to reduce the distortion in the alignment direction and achieve the above characteristics, it is only necessary to appropriately adjust the stretching temperature, stretching ratio, stretching speed, heat setting temperature, temperature of the relaxation step, the ratio of the relaxation step, and the temperature distribution in the width direction of each temperature.

Furthermore, when the alignment direction of the formed film does not fall within a predetermined range across the entire width, it is preferable to use a portion such as the central portion of the stretched wide film that falls within the above characteristic range. In addition, if the alignment in the uniaxial direction is enhanced, the distortion in the alignment direction tends to be smaller, so it is also a better method to use a weakly biaxially or uniaxially stretched film. In particular, a weakly biaxially or uniaxially stretched film in which the MD direction is the main alignment direction is preferred.

Furthermore, in the present invention, the angle between the alignment direction of the transfer alignment film and the flow direction of the alignment film or a direction orthogonal to the flow direction, and the angle difference between the alignment angles in the width direction of the film are determined as follows. . First, the film is pulled out from the roll, and the alignment direction is determined at five locations at the two ends (5 cm inside from each end), the center, and the intermediate portion between the center and both ends. The intermediate portion between the central portion and both end portions is located at a position that bisects the distance between the central portion and both end portions. In addition, the alignment direction is regarded as the slow axis direction of the film determined using a molecular alignment meter. Next, it was investigated whether the alignment direction of the entire film was close to the flow direction (MD) or close to the width direction (TD). Then, when the alignment direction of the entire film is close to the flow direction, the angle between the alignment direction and the flow direction of the film is found at each of the five places mentioned above, and the value at the maximum angle is used as "the alignment direction of the alignment film and the flow direction of the film." The maximum value of the angle between the flow directions of the alignment film. On the other hand, when the alignment direction of the entire film is close to the width direction, the angle between the alignment direction and the direction orthogonal to the flow direction of the film is determined at each of the above five locations, and the value at the maximum angle is used as The maximum value of "the angle between the alignment direction of the alignment film and the direction orthogonal to the flow direction of the alignment film". Moreover, among the angles calculated in the above five points, the difference between the maximum value and the minimum value is regarded as "the angle difference in the alignment angle of the film in the width direction." In addition, the angle is regarded as a positive value when the alignment direction is on the same side as the maximum value with respect to the length direction or the width direction, and as a negative value when the alignment direction is on the opposite side with respect to the length direction or width direction. , distinguish positive and negative, and evaluate the minimum value.

The lower limit of the thermal shrinkage difference between the MD direction and the TD direction at 150° C. for 30 minutes of the alignment film for transfer of the present invention is preferably 0%. In addition, the upper limit of the thermal shrinkage difference between the MD direction and the TD direction of the alignment film for transfer of the present invention at 150° C. for 30 minutes is preferably 4%, more preferably 3%, further preferably 2%, and particularly preferably 1.5%, optimal is 1%. If the upper limit is exceeded, when a high temperature is required for the alignment process of the liquid crystal compound, or when a plurality of liquid crystal compounds are stacked and the temperature experience increases, the alignment direction of the liquid crystal compound may deviate from the design, which may cause problems when the polarizing plate is used in a display. Light leakage, etc. occurs.

The lower limit of the heat shrinkage rate in the MD direction of the alignment film for transfer printing at 150° C. for 30 minutes is preferably -2%, more preferably -0.5%, further preferably -0.1%, and particularly preferably 0%. The best is 0.01%. If it is less than the above, it may become difficult to achieve the actual numerical value. In addition, the upper limit of the thermal shrinkage rate of the alignment film for transfer of the present invention in the MD direction at 150°C for 30 minutes is preferably 4%, more preferably 3%, further preferably 2.5%, particularly preferably 2%, and most preferably The best is 1.5%. If it exceeds the above, it will be difficult to adjust the thermal shrinkage rate difference. In addition, the flatness will be deteriorated and the workability will be deteriorated.

The lower limit of the thermal shrinkage rate of the alignment film for transfer printing in the TD direction at 150° C. for 30 minutes is preferably -2%, more preferably -0.5%, further preferably -0.1%, and particularly preferably 0%. The best is 0.01%. If it is less than the above, it may become difficult to achieve the actual numerical value. In addition, the upper limit of the thermal shrinkage rate of the alignment film for transfer in the TD direction at 150° C. for 30 minutes is preferably 4%, more preferably 2.5%, further preferably 2%, particularly preferably 1.5%, and most preferably The best is 1%. If it exceeds the above, it will be difficult to adjust the thermal shrinkage rate difference. In addition, the flatness will be deteriorated and the workability will be deteriorated.

The lower limit of the thermal shrinkage rate difference between the direction of 45 degrees with respect to the MD direction and the direction of 135 degrees with respect to the MD direction at 150° C. for 30 minutes of the alignment film for transfer of the present invention is preferably 0%. If it is less than the above, it may become difficult to achieve the actual numerical value. In addition, the upper limit of the thermal shrinkage difference between the direction of 45 degrees with respect to the MD direction and the direction of 135 degrees with respect to the MD direction of the alignment film for transfer of the present invention at 150° C. for 30 minutes is preferably 4%. Better is 3%, further better is 2%, extra best is 1.5%, and best is 1%. If it deviates from the above range, the alignment direction of the liquid crystal compound deviates from the design, and light leakage may occur when the polarizing plate is used in a display.

The heat shrinkage characteristics of the film can be adjusted by stretching temperature, stretching ratio, heat setting temperature, relaxation step ratio, relaxation step temperature, etc. In addition, it is also preferable that the surface temperature of the film is 100°C or higher during the cooling step and that the film is released from the clamp and rolled up. The release from the clamp may be by opening the clamp, or by cutting off the end held by the clamp with a knife or the like. In addition, performing heat treatment (annealing treatment) offline is also an effective method.

In order to achieve the above-mentioned thermal shrinkage characteristics of the alignment film for transfer at 150° C. for 30 minutes, the material of the alignment film for transfer is preferably polyester, and particularly preferably polyethylene terephthalate.

The lower limit of the maximum thermal shrinkage rate at 95°C of the alignment film for transfer printing of the present invention is preferably 0%, more preferably 0.01%. If it is less than the above, it may become difficult to achieve the actual numerical value. In addition, the upper limit of the maximum thermal shrinkage rate at 95°C of the alignment film for transfer of the present invention is preferably 2.5%, more preferably 2%, further preferably 1.2%, particularly preferably 1%, and most preferably 0.8%. If it exceeds the above, light leakage may occur when the polarizing plate is used in a display.

The lower limit of the angle between the maximum thermal shrinkage direction and the MD or TD direction of the alignment film for transfer of the present invention is preferably 0 degrees. In addition, the upper limit of the angle between the maximum heat shrinkage direction and the MD or TD direction of the alignment film for transfer of the present invention is preferably 20 degrees, more preferably 15 degrees, further preferably 10 degrees, and particularly preferably 7 degrees. The optimum is 5 degrees. If it exceeds the above, the alignment direction of the liquid crystal compound will deviate from the design, and light leakage may occur when the polarizing plate is used in a display.

The lower limit of the elastic modulus in the MD direction and the elastic modulus in the TD direction of the alignment film for transfer of the present invention is preferably 1 GPa, more preferably 2 GPa. If it is less than the above, it will stretch in each step and the alignment direction will not conform to the design. Furthermore, the upper limit of the elastic modulus in the MD direction and the elastic modulus in the TD direction of the alignment film for transfer of the present invention is preferably 8 GPa, more preferably 7 GPa. If it exceeds the above, it may become difficult to achieve the actual numerical value.

When the alignment film for transfer of the present invention is a polyethylene terephthalate film, the precipitation amount of ester cyclic terpolymer on the surface of the release surface of the aligned polyester film after heating at 150°C for 90 minutes ( The lower limit, hereinafter referred to as the surface oligomer precipitation amount (150° C. 90 min), is preferably 0 mg/m ² , more preferably 0.01 mg/m ² . If it is less than the above, it may become difficult to achieve the actual numerical value. The upper limit of the surface oligomer precipitation amount (150° C. 90 min) is preferably 1 mg/m ² , more preferably 0.7 mg/m ² , further preferably 0.5 mg/m ² , and particularly preferably 0.3 mg/m ² . If it exceeds the above, when a plurality of liquid crystal compound alignment layers are laminated or when alignment processing at high temperatures is required, haze will increase or foreign matter will be generated, and polarization will be disturbed during alignment control under ultraviolet irradiation, resulting in the failure to achieve the designed phase. Difference layer or polarizing layer. Furthermore, in the present invention, the "release surface" of the alignment film means the surface of the liquid crystal compound alignment layer on which the alignment film is intended to be transferred. When an oligomer barrier coating, planarization layer or release layer is provided, as long as a liquid crystal compound alignment layer is provided on it, the surface of the oligomer barrier coating, planarization layer or release layer will (The surface in contact with the liquid crystal compound alignment layer) is the "release surface" of the alignment film.

In order to reduce the amount of oligomer precipitation on the surface, it is preferable to provide a coating layer (oligomer barrier coating) that can block the precipitation of oligomers (ester cyclic trimer) on the surface of the alignment film for transfer.

The oligomer barrier coating preferably contains more than 50% by weight of a resin with a Tg of 90°C or more. As such resin, amine resins such as melamine, alkyd resins, polystyrene, acrylic resins, etc. are preferred. The upper limit of Tg of the resin is preferably 200°C.

The lower limit of the thickness of the oligomer barrier coating is preferably 0.01 μm, more preferably 0.03 μm, and still more preferably 0.05 μm. If it is less than the above, sufficient blocking effect will not be obtained. The upper limit of the thickness of the oligomer barrier coating is preferably 10 μm, more preferably 5 μm, and still more preferably 2 μm. If it exceeds the above, the effect may become saturated.

In addition, in order to reduce the amount of surface oligomer precipitation, it is also preferable to reduce the content of the oligomer (ester cyclic trimer) in the polyester resin constituting the release surface side layer of the alignment film for transfer (hereinafter referred to as is the surface oligomer content). The lower limit of the surface layer oligomer content is preferably 0.3% by mass, more preferably 0.33% by mass, and still more preferably 0.35% by mass. If it is less than the above, it may become difficult to achieve the actual numerical value. The upper limit of the surface layer oligomer content is preferably 0.7% by mass, more preferably 0.6% by mass, further preferably 0.5% by mass. In addition, in the present invention, the "release surface side layer" of the alignment film means the layer on which the release surface exists among the polyester layers constituting the alignment film. Here, even when the film is a single layer, it may be called a release surface side layer. At this time, the back side layer and the release surface side layer described later become the same layer.

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

In addition, in order to reduce the amount of oligomer precipitation on the surface layer, it is also effective to shorten the melting time during film formation.

When the alignment film for transfer of the present invention is a polyester film, the lower limit of the intrinsic viscosity (IVf) of the polyester constituting the film is preferably 0.45 dl/g, more preferably 0.5 dl/g, and further preferably 0.53 dl. /g. If it is less than the above, the impact resistance of the film may deteriorate. In addition, film formation may become difficult or the uniformity of thickness may deteriorate. The upper limit of IVf is preferably 0.9dl/g, more preferably 0.8dl/g, further preferably 0.7dl/g. If it exceeds the above, the thermal shrinkage rate may become high. In addition, film formation may become difficult.

The lower limit of the light transmittance of the alignment film for transfer printing of the present invention at a wavelength of 380 nm is preferably 0%. In addition, the upper limit of the light transmittance of the alignment film for transfer of the present invention at a wavelength of 380 nm is preferably 20%, more preferably 15%, further preferably 10%, and particularly preferably 5%. If the upper limit is exceeded, when a specific alignment direction is achieved by irradiation of polarized ultraviolet rays, the direction uniformity of the alignment layer or the liquid crystal compound alignment layer may deteriorate due to reflection from the back surface. The light transmittance at wavelength 380nm can be within the range by adding UV absorbers.

The lower limit of the haze of the alignment film for transfer printing of the present invention is preferably 0.01%, more preferably 0.1%. If it is less than the above, it may become difficult to achieve the actual numerical value. In addition, the upper limit of the haze of the alignment film for transfer of the present invention is preferably 3%, more preferably 2.5%, further preferably 2%, and particularly preferably 1.7%. If it exceeds the above, the polarization system will be disordered during polarized UV irradiation, and a retardation layer or polarizing layer that meets the design will not be obtained. In addition, when inspecting the retardation layer or polarizing layer, light leakage may occur due to diffuse reflection, making inspection difficult.

The lower limit of the haze of the alignment film for transfer of the present invention after heating at 150° C. for 90 minutes is the same as above.

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

The alignment film for transfer of the present invention has a refractive index nx in the slow axis direction - a refractive index ny in the fast axis direction. The lower limit is preferably 0.005, more preferably 0.01, further preferably 0.02, particularly preferably 0.03, and most preferably 0.04, optimal is 0.05. If it is less than the above, it may become difficult to achieve the actual numerical value. Moreover, the upper limit of nx-ny is preferably 0.15, more preferably 0.13, and further preferably 0.12. If it exceeds the above, it may become difficult to achieve the actual numerical value. In particular, in the case of a polyethylene terephthalate film, the value of nx-ny is preferably the above.

In the case of biaxial extension, the lower limit of nx-ny is preferably 0.005, and more preferably 0.01. If it is less than the above, it may become difficult to achieve the actual numerical value. Moreover, in the case of biaxial stretching, the upper limit of nx-ny is preferably 0.05, more preferably 0.04, and further preferably 0.03. If it exceeds the above, it may become difficult to achieve the actual numerical value.

In the case of uniaxial extension, the lower limit of nx-ny is preferably 0.05, and more preferably 0.06. If it is less than the above, the advantages of uniaxial extension will be diluted. In addition, in the case of uniaxial extension, the upper limit of nx-ny is preferably 0.15, more preferably 0.13. If it exceeds the above, it may become difficult to achieve the actual numerical value.

The lower limit of the refractive index (ny) in the fast axis direction of the alignment film for transfer of the present invention is preferably 1.55, more preferably 1.58, and further preferably 1.57. Furthermore, the upper limit of the refractive index (ny) in the fast axis direction of the alignment film for transfer of the present invention is preferably 1.64, more preferably 1.63, and still more preferably 1.62.

The lower limit of the refractive index (nx) in the slow axis direction of the alignment film for transfer of the present invention is preferably 1.66, more preferably 1.67, and still more preferably 1.68. Furthermore, the upper limit of the refractive index (nx) in the slow axis direction of the alignment film for transfer of the present invention is preferably 1.75, more preferably 1.73, further preferably 1.72, and particularly preferably 1.71.

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

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

A release layer may also be provided on the alignment film for transfer. However, when the film itself has low adhesion to a transfer material such as a retardation layer or an alignment layer and has sufficient releasability even without a release layer, the release layer does not need to be provided. In addition, when the adhesion is too low, the surface may be subjected to corona treatment or the like to adjust the adhesion. The release layer can be formed using a well-known release agent, and preferred examples include alkyd resins, amine resins, long-chain acrylic acrylates, silicone resins, and fluororesins. These systems can be appropriately selected according to the adhesion to the transfer material.

Furthermore, in the alignment film for transfer of the present invention, an easy-adhesion layer can also be provided as a layer beneath the oligomer barrier coating, antistatic layer and release layer.

(Roughness of release surface) The release surface (layer A surface) of the alignment film for transfer of the present invention is preferably smooth.

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

The lower limit of the three-dimensional ten-point average roughness (SRz) of the release surface of the alignment film for transfer of the present invention is preferably 5 nm, more preferably 10 nm, and further preferably 13 nm. In addition, the upper limit of SRz of the release surface of the alignment film for transfer of the present invention is preferably 200 nm, more preferably 150 nm, further preferably 120 nm, particularly preferably 100 nm, and most preferably 80 nm.

The lower limit of the maximum height of the release surface of the alignment film for transfer of the present invention (SRy: the maximum mountain height of the release surface SRp + the maximum valley depth of the release surface SRv) is preferably 10 nm, more preferably 15 nm, and further preferably 20 nm. . Furthermore, the upper limit of SRy on the release surface of the alignment film for transfer of the present invention is preferably 300 nm, more preferably 250 nm, further preferably 150 nm, particularly preferably 120 nm, and most preferably 100 nm.

The upper limit of the number of protrusions of 0.5 μm or more on the release surface of the alignment film for transfer of the present invention is preferably 5 pieces/m ² , more preferably 4 pieces/m ² , and further preferably 3 pieces/m ² , especially The optimal number is 2 pieces/m ² and the optimal number is 1 piece/m ² .

If the roughness of the release surface exceeds the above, a small portion of the liquid crystal compound alignment layer formed on the transfer alignment film of the present invention will not achieve the designed alignment state or phase difference, and pinholes may occur. or scar-like defects. It is considered that the reason for this is that if it is an alignment layer, the alignment layer of the convex portion will peel off during rubbing, or the friction of the foot portion or the concave portion of the convex portion will become insufficient. In addition, it is believed that the reason is that the release surface layer contains particles, and the particles fall off during friction, damaging the surface. In addition, it is believed that even if it is a friction alignment layer or a photo alignment layer, when it is rolled up in a state where the alignment layer is provided, the friction with the back layer will cause holes in the alignment layer of the convex portion, and the alignment will occur due to pressure. Disorders etc. It is believed that the reason is that due to defects in these alignment layers, when a liquid crystal compound alignment layer is provided on the alignment layer, alignment of the liquid crystal compound does not occur in a small part of the alignment layer.

It is thought that the reason is that if it is a liquid crystal compound alignment layer, when the liquid crystal compound is coated, the thickness of the liquid crystal compound alignment layer becomes thinner in the convex parts, or the thickness becomes thinner in the concave parts, etc., and the compliance is not obtained. Design phase difference.

In order to make the roughness of the release surface (A) fall into the above range, when the alignment film for transfer of the present invention is a stretched film, the following method can be used. ・Make the release side layer (surface layer) of the film raw material free of particles. ・When particles are contained in the release surface side layer (surface layer) of the film raw material, particles with a small particle size will be formed. ・When the side layer (surface layer) of the release surface of the film material contains particles, provide a flattening coating.

In addition, in addition to the above, it is also important to clean the raw materials or manufacturing steps as follows. ・Filter the particle slurry during polymerization. Filter before fragmentation. ・Makes fragmented cooling water purifier. Make the environment clean before the debris is transported and the film-making machine is put into operation. ・During film production, the molten resin is filtered to remove aggregated particles or foreign matter. ・Filter the paint to remove foreign matter. ・Carry out in a clean environment during film making, coating and drying.

For the purpose of smoothing, the surface layer is preferably substantially free of particles. The term "substantially free of particles" means that the particle content is less than 50 ppm, preferably less than 30 ppm.

In order to improve the sliding properties of the surface, the surface layer may also contain particles. When particles are contained, the lower limit of the surface particle content is preferably 0 ppm, more preferably 50 ppm, and further preferably 100 ppm. Moreover, the upper limit of the surface particle content is preferably 20,000 ppm, more preferably 10,000 ppm, further preferably 8,000 ppm, and particularly preferably 6,000 ppm. If it exceeds the upper limit, the roughness of the surface layer cannot be brought into a preferable range.

The lower limit of the surface particle diameter is preferably 0.005 μm, more preferably 0.01 μm, and still more preferably 0.02 μm. Moreover, the upper limit of the surface particle diameter is preferably 3 μm, more preferably 1 μm, further preferably 0.5 μm, and particularly preferably 0.3 μm. If it exceeds the upper limit, the roughness of the surface layer cannot be brought into a preferable range.

Even if the surface layer does not contain particles or has particles with a small particle size, when the lower layer contains particles, the roughness of the release surface layer may become high due to 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 provide a lower layer (intermediate layer) that does not contain particles.

The lower limit of the surface layer thickness is preferably 0.1 μm, more preferably 0.5 μm, further preferably 1 μm, particularly preferably 3 μm, and most preferably 5 μm. Moreover, the upper limit of the surface layer thickness is preferably 97%, more preferably 95%, and further preferably 90% with respect to the total thickness of the alignment film for transfer.

The middle layer that does not contain particles means that it does not contain particles substantially, and the content of particles is less than 50 ppm, preferably less than 30 ppm. The lower limit of the thickness of the intermediate layer is preferably 10%, more preferably 20%, and further preferably 30% relative to the total thickness of the alignment film for transfer. The upper limit is preferably 95%, more preferably 90%.

When the surface layer of the alignment film for transfer has high roughness, a planarization coating can also be provided. Examples of the resin used for the flattening coating include resins commonly used as coating agents, such as polyester, acrylic, polyurethane, polystyrene, and polyamide. It is also preferred to use melamine, isocyanate, epoxy resin, Cross-linking agent for oxazoline compounds. These can be dissolved or dispersed in organic solvents or water to become coating agents, which can be applied and dried. Alternatively, in the case of acrylic, it can be coated without solvent and hardened with radiation. The planarization coating can also be an oligomer barrier coating. When the release layer is provided by coating, the release layer itself can also be thickened.

The lower limit of the thickness of the surface planarizing coating is preferably 0.01 μm, more preferably 0.1 μm, further preferably 0.2 μm, and particularly preferably 0.3 μm. If it is less than the above, the flattening effect will be insufficient. Moreover, the upper limit of the thickness of the surface planarization coating is preferably 10 μm, more preferably 7 μm, further preferably 5 μm, and particularly preferably 3 μm. Even if it exceeds the above, a higher flattening effect may not be obtained.

The planarization coating can be applied in-line during the film production process, or can also be provided offline.

(Back side roughness) Furthermore, even if the release surface of the transfer alignment film of the present invention is smoothed, defects may occur in the liquid crystal compound alignment layer. It can be seen that this is because the alignment film for transfer is rolled into a roll, and since the surface and the back surface are in contact, the roughness of the back surface is transferred to the surface (the convex portions on the back surface are transferred to the release layer to form concave portions). In order to protect the liquid crystal compound alignment layer, the transfer alignment film provided with the liquid crystal compound alignment layer is sometimes laminated with a masking film and rolled up. However, in order to reduce costs, it is often rolled up directly. In this way, it is considered that when the alignment layer is rolled up in a state where the alignment layer is provided, phenomena such as depressions, holes, and alignment disorder of the alignment layer occur due to the convex portions on the back surface of the alignment layer. Furthermore, it is believed that after the liquid crystal compound alignment layer is provided, voids, alignment disorder and other phenomena may occur in the liquid crystal compound alignment layer due to the convex portions on the back surface. In particular, the pressure in the winding core part is high, so this phenomenon is easy to occur. Based on the above knowledge, it can be seen that the above-mentioned shortcomings can be prevented by making the surface opposite to the release surface (the back surface) have a specific roughness.

The lower limit of the three-dimensional arithmetic mean roughness (SRa) of the back surface of the alignment film for transfer of the present invention is preferably 1 nm, more preferably 2 nm, further preferably 3 nm, particularly preferably 4 nm, and most preferably 5 nm. Furthermore, the upper limit of SRa on the back surface of the alignment film for transfer of the present invention is preferably 50 nm, more preferably 45 nm, and still more preferably 40 nm. If the upper limit is exceeded, the disadvantages may increase.

The lower limit of the three-dimensional ten-point average roughness (SRz) of the back surface of the alignment film for transfer of the present invention is preferably 7 nm, more preferably 10 nm, further preferably 15 nm, particularly preferably 20 nm, and most preferably 25 nm. In addition, the upper limit of SRz on the back side of the alignment film for transfer of the present invention is preferably 1500 nm, more preferably 1200 nm, further preferably 1000 nm, particularly preferably 700 nm, and most preferably 500 nm. If it exceeds the above, the disadvantages may increase.

The lower limit of the maximum height of the backside of the alignment film for transfer of the present invention (SRy: the maximum mountain height of the backside SRp + the maximum other depth of the backside SRv) is preferably 15 nm, more preferably 20nm, further preferably 25nm, and particularly preferably 30nm. The optimum is 40nm. In addition, the upper limit of the maximum height SRy of the back surface of the alignment film for transfer of the present invention is preferably 2000 nm, more preferably 1500 nm, further preferably 1200 nm, particularly preferably 1000 nm, and most preferably 700 nm. If it exceeds the above, the disadvantages may increase.

The upper limit of the number of protrusions of 2 μm or more on the back surface of the alignment film for transfer of the present invention is preferably 5/m ² , more preferably 4/m ² , further preferably 3/m ² , and particularly preferably 2 pieces/m ² , the best is 1 piece/m ² . If it exceeds the above, the disadvantages may increase.

If the roughness of the back surface of the alignment film for transfer of the present invention is less than the above range, the film will have poor sliding properties, making it difficult to slide or prone to scratches during transportation and winding of the film roll. In addition, if the roughness of the back surface of the alignment film for transfer of the present invention exceeds the above, the above-mentioned shortcomings will easily occur.

In order to make the roughness of the back surface fall into the above range, when the alignment film for transfer of the present invention is a stretched film, the following method can be used. ・The backside layer (backside layer) of the film raw material is made to contain specific particles. ・If the intermediate layer of the film raw material contains particles, the thickness will be reduced so that the back layer side (back layer) does not contain particles. ・When the roughness of the back side layer (back layer) of the film raw material is large, a flattening coating is provided. ・When the back side layer (back layer) of the film raw material does not contain particles or the roughness is small, an easy-slip coating (particle-containing coating) is provided.

The lower limit of the particle size of the back layer is preferably 0.01 μm, more preferably 0.05 μm, and still more preferably 0.1 μm. If it is less than the above, the sliding properties will deteriorate and winding failure may occur. Moreover, the upper limit of the particle size of the back surface layer is preferably 5 μm, more preferably 3 μm, and still more preferably 2 μm. If it exceeds the above, the back surface may become too thick.

When particles are contained on the back surface, 50 ppm is preferred, and 100 ppm is more preferred. If it is less than the above, the sliding effect caused by the addition of particles will not be obtained. Moreover, the upper limit of the particle content of the back layer is preferably 10,000 ppm, more preferably 7,000 ppm, and still more preferably 5,000 ppm. If it exceeds the above, the back surface may become too thick.

The lower limit of the back layer thickness is preferably 0.1 μm, more preferably 0.5 μm, further 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%, and further preferably 85% of the total thickness of the alignment film for transfer.

It is also preferable that the middle layer contains particles and the back layer is made thinner without containing particles, thereby controlling the roughness of the back surface. By adopting such a form, it is possible to ensure the roughness of the back surface while preventing particles from falling off.

The particle size or added amount of the particles in the middle layer is the same as that of the particles in the back layer. At this time, the lower limit of the thickness of the back surface layer is preferably 0.5 μm, more preferably 1 μm, and further preferably 2 μm. The upper limit of the thickness is preferably 30 μm, more preferably 25 μm, and still more preferably 20 μm.

When the back side of the original film is rough, it is also preferable to provide a flattening coating. The planarization coating can be used in the same manner as those listed for the planarization coating on the surface.

The lower limit of the thickness of the back surface planarizing coating is preferably 0.01 μm, more preferably 0.03 μm, and still more preferably 0.05 μm. If it is smaller than the above, the flattening effect will become smaller. Moreover, the upper limit of the thickness of the back surface planarization coating is preferably 10 μm, more preferably 5 μm, and still more preferably 3 μm. Even if it exceeds the above, the flattening effect will be saturated.

The back side of the original film can be made particle-free, and an easy-slip coating containing particles can be provided on the back side. In addition, when the roughness of the back side of the original film is small, an easy-slip coating can also be provided.

The lower limit of the particle size of the back surface slippery coating is preferably 0.01 μm, more preferably 0.05 μm. If it is less than the above, slipability will not be obtained. In addition, the upper limit of the particle size of the back surface slippery coating is preferably 5 μm, more preferably 3 μm, further preferably 2 μm, and particularly preferably 1 μm. If it exceeds the above, the roughness of the back surface may be too high.

The lower limit of the particle content of the back slippery coating is preferably 0.1 mass%, more preferably 0.5 mass%, further preferably 1 mass%, particularly preferably 1.5 mass%, and most preferably 2 mass%. If it is less than the above, slipability will not be obtained. Moreover, the upper limit of the particle content of the back surface slippery coating is preferably 20 mass%, more preferably 15 mass%, and further preferably 10 mass%. If it exceeds the above, the roughness of the back surface may be too high.

The lower limit of the thickness of the back surface slippery coating is preferably 0.01 μm, more preferably 0.03 μm, and further preferably 0.05 μm. In addition, the upper limit of the thickness of the back surface slippery coating is preferably 10 μm, more preferably 5 μm, further preferably 3 μm, particularly preferably 2 μm, and most preferably 1 μm.

(Production method of alignment film for transfer printing) Hereinafter, the manufacturing method of the transfer alignment film when the transfer alignment film of the present invention is a stretched film will be described. When performing MD stretching, the lower limit of the MD magnification is preferably 1.5 times. The upper limit is preferably 6 times, more preferably 5.5 times, and further preferably 5 times. Furthermore, when performing TD stretching, the lower limit of the TD magnification ratio is preferably 1.5 times. The upper limit of the TD magnification is preferably 6 times, more preferably 5.5 times, and further preferably 5 times.

The lower limit of the HS temperature is preferably 150°C, more preferably 170°C. If it is less than the above, the thermal shrinkage rate may not decrease. Moreover, the upper limit of the HS temperature is preferably 240°C, more preferably 230°C. If it exceeds the upper limit, the resin may deteriorate.

The lower limit of the TD relaxation rate is preferably 0.1%, more preferably 0.5%. If it is less than the above, the thermal shrinkage rate may not decrease. Moreover, the upper limit of the TD relaxation rate is preferably 8%, more preferably 6%, and further preferably 5%. If it exceeds the above, the flatness will deteriorate due to relaxation, and the thickness may become uneven.

The annealing treatment is preferably a method of rolling out the film and passing it through an oven.

The lower limit of the annealing temperature is preferably 80°C, more preferably 90°C, and further preferably 100°C. If it is less than the above, the annealing effect may not be obtained. Moreover, the upper limit of the annealing temperature is preferably 200°C, more preferably 180°C, and still more preferably 160°C. If it exceeds the upper limit, the flatness may decrease or the heat shrinkage may increase.

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

In the annealing process, methods such as adjusting the relaxation rate by adjusting the circumferential speed difference between the unwinding speed and the coiling speed are used, and the coiling tension is adjusted to adjust the relaxation rate. The lower limit of the relaxation rate is preferably 0.5%. If it is less than the above, the annealing effect may not be obtained. Moreover, the upper limit of the relaxation rate is preferably 8%, more preferably 6%, and further preferably 5%. If the upper limit is exceeded, flatness may be reduced or winding failure may occur.

(Laminate for liquid crystal compound alignment layer transfer) Next, the laminate for transferring the liquid crystal compound alignment layer of the present invention will be described. The laminate for transfer of a liquid crystal compound alignment layer of the present invention has a structure in which a liquid crystal compound alignment layer and the alignment film for transfer of the present invention are laminated. The liquid crystal compound alignment layer must be coated on the transfer alignment film to align it. Methods for aligning the liquid crystal compound include rubbing treatment on the lower layer (release surface) of the liquid crystal compound alignment layer to impart an alignment control function, or directly aligning the liquid crystal compound by irradiating polarized ultraviolet light after coating the liquid crystal compound. method.

(Alignment control layer) Also preferred is a method of providing an alignment control layer on the alignment film for transfer, and providing a liquid crystal compound alignment layer on the alignment control layer. In addition, in the present invention, not only the liquid crystal compound alignment layer, but also the alignment control layer and the liquid crystal compound alignment layer may be collectively referred to as the liquid crystal compound alignment layer. The alignment control layer can be any type of alignment control layer as long as the liquid crystal compound alignment layer is brought into a desired alignment state. Examples of the alignment control layer include a rubbing treatment alignment control layer after rubbing a resin coating film, or a rubbing treatment alignment control layer. A suitable example is a light alignment control layer that is irradiated with polarized light to align molecules and produce an alignment function.

(Rubbing treatment alignment control layer) As the polymer material used in the alignment control layer formed by rubbing treatment, polyvinyl alcohol and its derivatives, polyimide and its derivatives, acrylic resin, polysiloxane derivatives, etc. are preferably used.

Next, the formation method of the rubbing treatment alignment control layer will be described. First, the rubbing-treated alignment control layer coating liquid containing the above-mentioned polymer material is coated on the release surface of the alignment film, and then heated and dried to obtain an alignment control layer before rubbing treatment. The alignment control layer coating liquid may also contain a crosslinking agent.

As a solvent for the rubbing treatment alignment control layer coating liquid, any solvent can be used without limitation as long as it dissolves the polymer material. Specific examples include alcohols such as water, methanol, ethanol, ethylene glycol, isopropyl alcohol, propylene glycol, and cellulose; ester solvents such as ethyl acetate, butyl acetate, and γ-butyrolactone; and acetone. , ketone solvents such as methyl ethyl ketone, cyclopentanone, cyclohexanone, etc.; aromatic hydrocarbon solvents such as toluene or xylene; ether solvents such as tetrahydrofuran or dimethoxyethane, etc. These solvents can be used individually or in combination.

The concentration of the rubbing treatment alignment control layer coating liquid can be appropriately adjusted according to the type of polymer or the thickness of the alignment control layer to be produced. However, in terms of solid content concentration, 0.2 to 20 mass % is preferred, and 0.3 is particularly preferred. ~10% by mass. As a coating method, well-known methods such as coating methods such as gravure coating, die coating, rod coating, and applicator method, or printing methods such as flexographic method can be used.

The heating and drying temperature also depends on the alignment film for transfer, but for PET, it is preferably in the range of 30°C to 170°C, more preferably 50°C to 150°C, and still more preferably 70°C to 130°C. When the drying temperature is low, it may be necessary to extend the drying time, resulting in poor productivity. When the drying temperature is too high, the alignment film for transfer will stretch due to heat, or the thermal shrinkage will increase, making it impossible to achieve the designed optical function, or the flatness may deteriorate. The heating drying time can be, for example, 0.5 to 30 minutes, preferably 1 to 20 minutes, more preferably 2 to 10 minutes.

The thickness of the rubbing treatment alignment control layer is preferably 0.01-10 μm, more preferably 0.05-5 μm, particularly preferably 0.1 μm-1 μm.

Next, a rubbing treatment is applied. Rubbing treatment can generally be implemented by rubbing paper or cloth on the surface of the polymer layer in a certain direction. Generally speaking, a friction roller made of fleece cloth made of nylon, polyester, acrylic, etc. fibers is used to rub the surface of the alignment control layer. In order to provide a liquid crystal compound alignment control layer that is aligned in a predetermined direction obliquely with respect to the length direction of the strip-shaped film, the rubbing direction of the alignment control layer must also be at a suitable angle. The angle can be adjusted by adjusting the angle between the friction roller and the alignment film, adjusting the transport speed of the alignment film and the rotation number of the roller to make it consistent.

Furthermore, the release surface of the alignment film for transfer can also be directly rubbed so that the surface of the alignment film for transfer has an alignment control function. This case is also included in the technical scope of the present invention.

(Photo-alignment control layer) The so-called photo-alignment control layer refers to coating a coating liquid containing a polymer or monomer with a photoreactive group and a solvent on the alignment film, and imparting alignment control power by irradiating polarized light, preferably polarized ultraviolet light. Alignment film. The so-called photoreactive group refers to a group that produces liquid crystal alignment ability by irradiation with light. Specifically, it is a photoreactor that is the origin of the alignment ability of liquid crystal, such as alignment induction of molecules produced by irradiation of light or isomerization reaction, dimerization reaction, photocrosslinking reaction or photodecomposition reaction. Among the photoreactive groups, those that undergo dimerization reaction or photocrosslinking reaction are preferred in that they have excellent alignment properties and maintain the smectic liquid crystal state of the alignment layer of the liquid crystal compound. As a photoreactive group that can undergo the above reaction, it is preferable to have an unsaturated bond, especially a double bond, and particularly preferably to have a bond selected from the group consisting of C=C bond, C=N bond, N=N bond, and C=O bond. At least one of the bases of the group formed.

Examples of the photoreactive group having a C=C bond include a vinyl group, a polyalkenyl group, a distyryl group, a styrylpyridinyl group, a styrylpyridinium group, a chalcone group, a cinnamyl group, and the like. . Examples of the photoreactive group having a C=N bond include groups having structures such as aromatic Schiff bases and aromatic hydrazones. Examples of the photoreactive group having an N=N bond include an azophenyl group, an azonaphthyl group, an aromatic heterocyclic azo group, a disazo group, a methyl group, and the like, or an azooxybenzene group. Basic structurer. Examples of the photoreactive group having a C=O bond include a diphenylketo group, a coumarin group, an anthraquinone group, a maleimide group, and the like. These groups may also have substituents such as alkyl, alkoxy, aryl, allyloxy, cyano, alkoxycarbonyl, hydroxyl, sulfonate, and halogenated alkyl groups.

Among them, photoreactive groups that can undergo photodimerization reactions are preferred. The cinnamyl group and the chalcone group require a relatively small amount of polarized light irradiation for photoalignment, and it is easy to obtain thermal stability or time-lapse properties. It is preferred for a photo-alignment layer with excellent stability. Furthermore, as a polymer having a photoreactive group, a polymer having a cinnamonyl group forming a structure such as cinnamic acid at the end of the side chain of the polymer is particularly preferred. Examples of the structure of the main chain include polyimide, polyamide, (meth)acrylic acid, polyester, and the like.

Specific examples of the alignment control layer include Japanese Patent Application Publication No. 2006-285197, Japanese Patent Application Publication No. 2007-76839, Japanese Patent Application Publication No. 2007-138138, Japanese Patent Application Publication No. 2007-94071, and Japanese Patent Application Publication No. Japanese Patent Application Publication No. 2007-121721, Japanese Patent Application Publication No. 2007-140465, Japanese Patent Application Publication No. 2007-156439, Japanese Patent Application Publication No. 2007-133184, Japanese Patent Application Publication No. 2009-109831, Japanese Patent Application Publication No. 2002-229039 , Japanese Patent Application Publication No. 2002-265541, Japanese Patent Application Publication No. 2002-317013, Japanese Patent Application Publication No. 2003-520878, Japanese Patent Application Publication No. 2004-529220, Japanese Patent Application Publication No. 2013-33248, Japanese Patent Application Publication No. 2015 -Alignment control layer described in Publication No. 7702 and Japanese Patent Application Publication No. 2015-129210.

As the solvent of the coating liquid for forming the photo-alignment control layer, any solvent can be used without limitation as long as it can dissolve the polymer and monomer having a photoreactive group. Specific examples include those listed in the method of forming the alignment control layer by rubbing treatment. It is also preferable to add a photopolymerization initiator, a polymerization inhibitor, and various stabilizers to the coating liquid for forming the photoalignment control layer. Furthermore, a polymer other than a polymer having a photoreactive group and a monomer or a monomer having no photoreactive group copolymerizable with the monomer having a photoreactive group may be added.

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

The polarized light is preferably irradiated from the direction of the light alignment control layer in front of the alignment. Regarding the alignment direction of the alignment film for transfer, when the alignment direction of the photo-alignment control layer is parallel or vertical, the light can also be irradiated through the alignment film for transfer.

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

Polarized light is obtained, for example, by passing light from the aforementioned light source through a polarizer. By adjusting the polarization angle of the aforementioned polarizer, the direction of polarization can be adjusted. Examples of the polarizer include polarizing filters, polarizing filters such as Glan-Thompson and Glan-Taylor, or wire grid polarizers. The polarized light is preferably substantially parallel light.

By adjusting the angle of the irradiated polarized light, the direction of the alignment control force of the light alignment control layer can be adjusted arbitrarily.

Although the irradiation intensity varies depending on the type or amount of the polymerization initiator or resin (monomer), for example, based on 365 nm, it is preferably 10 to 10000 mJ/cm ² , more preferably 20 to 5000 mJ/cm ² .

(Liquid crystal compound alignment layer) The liquid crystal compound alignment layer is not particularly limited as long as it aligns liquid crystal compounds. Specific examples include a polarizing film (polarizer) containing a liquid crystal compound and a dichroic dye, and a retardation layer containing a rod-shaped or disk-shaped liquid crystal compound.

(Polarizing film) The polarizing film has the function of passing polarized light in only one direction and contains dichroic pigments.

(Dichroic pigment) The so-called dichroic pigment refers to a pigment whose absorbance in the long axis direction of the molecule and the absorbance in the short axis direction are different.

The dichroic dye preferably has an absorption maximum wavelength (λMAX) in the range of 300 to 700 nm. Examples of such dichroic dyes include acridine dyes, Pigments, cyanine pigments, naphthalene pigments, azo pigments, anthraquinone pigments, etc., among which azo pigments are preferred. Examples of azo dyes include monoazo dyes, disazo dyes, trisazo dyes, tetrasazo dyes, and stilbene azo dyes, and disazo dyes and trisazo dyes are preferred. The dichroic pigments may be used alone or in combination. However, in order to adjust the color tone (achromatic color), it is preferable to combine two or more types. Especially good is a combination of 3 or more types. In particular, it is preferable to combine three or more types of azo compounds.

Preferable azo compounds include dyes described in Japanese Patent Application Laid-Open Nos. 2007-126628, 2010-168570, 2013-101328, and 2013-210624.

The dichroic dye is preferably a dichroic dye polymer introduced into the side chain of a polymer such as acrylic acid. Examples of such dichroic dye polymers include polymers listed in Japanese Patent Application Laid-Open No. 2016-4055 and polymers obtained by polymerizing compounds [Chemical 6] to [Chemical 12] in Japanese Patent Laid-Open No. 2014-206682. .

The content of the dichroic pigment in the polarizing film is preferably 0.1 to 30% by mass, more preferably 0.5 to 20% by mass, and further preferably 0.1 to 30% by mass, from the viewpoint of improving the alignment of the dichroic pigment. The preferred range is 1.0 to 15% by mass, and the particularly preferred range is 2.0 to 10% by mass.

The polarizing film preferably further contains a polymerizable liquid crystal compound in order to improve film strength, degree of polarization, and film homogeneity. In addition, the polymerizable liquid crystal compound here also includes a polymerized product as a film.

(polymerizable liquid crystal compound) The so-called polymerizable liquid crystal compound is a compound that has a polymerizable group and exhibits liquid crystallinity. The so-called polymerizable group means a group that participates in the polymerization reaction, and is preferably a photopolymerizable group. Here, the photopolymerizable group refers to an active radical generated from a photopolymerization initiator to be described later or a group that can undergo a polymerization reaction with an acid or the like. Examples of the polymerizable group include vinyl, vinyloxy, 1-chlorovinyl, isopropenyl, 4-vinylphenyl, acryloxy, methacryloxy, and oxirane. Oxetanyl etc. Among them, an acryloxy group, a methacryloxy group, an vinyloxy group, an oxirane group and an oxetanyl group are preferred, and an acryloxy group is more preferred. The compound showing liquid crystallinity may be a thermotropic liquid crystal or a lyotropic liquid crystal, and examples of the thermotropic liquid crystal include nematic liquid crystal and smectic liquid crystal.

From the viewpoint of obtaining higher polarization characteristics, the polymerizable liquid crystal compound is preferably a smectic liquid crystal compound, and more preferably a high-order smectic liquid crystal compound. If the liquid crystal phase formed by the polymerizable liquid crystal compound is a higher-order smectic phase, a polarizing film with higher alignment order can be produced.

Specific preferred polymerizable liquid crystal compounds include, for example, Japanese Patent Application Laid-Open No. 2002-308832, Japanese Patent Application Laid-Open No. 2007-16207, Japanese Patent Application Laid-Open No. 2015-163596, and Japanese Patent Application Publication No. 2007-510946. Those described in Japanese Patent Application Publication No. 2013-114131, WO2005/045485, Recl. Trav. Chim. Pays-Bas, 115, 321-328 (1996) by Lub et al.

From the viewpoint of increasing the alignment of the polymerizable liquid crystal compound, the content ratio of the polymerizable liquid crystal compound in the polarizing film is preferably 70 to 99.5% by mass, more preferably 75 to 99% by mass, and further preferably 70 to 99.5% by mass in the polarizing film. The optimum range is 80 to 97 mass%, and the particularly preferred range is 83 to 95 mass%.

The polarizing film system can be provided by coating the polarizing film composition paint. The polarizing film composition coating may also include solvents, polymerization initiators, sensitizers, polymerization inhibitors, leveling agents, polymerizable non-liquid crystal compounds, cross-linking agents, etc.

As the solvent, those listed as solvents for the alignment layer coating liquid are preferably used.

The polymerization initiator is not limited as long as it polymerizes a polymerizable liquid crystal compound, but it is preferably a photopolymerization initiator that generates active radicals due to light. Examples of the polymerization initiator include benzoin compounds, benzophenone compounds, alkylphenone compounds, acylphosphine oxide compounds, and trisulfide compounds. Compounds, phosphonium salts and sulfonium salts, etc.

The sensitizer is preferably a photosensitizer. Examples include xanthone compounds, anthracene compounds, and phenanthrene compounds. , rubrene, etc.

Examples of polymerization inhibitors include hydroquinones, catechols, and thiophenols.

The polymerizable non-liquid crystal compound is preferably copolymerized with a polymerizable liquid crystal compound. For example, when the polymerizable liquid crystal compound has a (meth)acryloxy group, (meth)acrylates can be used. (Meth)acrylates may be monofunctional or polyfunctional. By using multifunctional (meth)acrylates, the strength of the polarizing film can be improved. When a polymerizable non-liquid crystal compound is used, it is preferably 1 to 15% by mass, more preferably 2 to 10% by mass, and particularly preferably 3 to 7% by mass in the polarizing film. If it exceeds 15 mass %, the degree of polarization may decrease.

Examples of the crosslinking agent include compounds capable of reacting with the functional groups of polymerizable liquid crystal compounds and polymerizable non-liquid crystal compounds. Examples of crosslinking agents include isocyanate compounds, melamine, epoxy resins, Zozoline compounds, etc.

After the polarizing film composition paint is directly coated on the alignment film for transfer or the alignment control layer, the polarizing film is formed by drying, heating, and hardening as necessary.

As the coating method, well-known methods such as coating methods such as gravure coating, die coating, rod coating, and applicator methods, or printing methods such as the flexographic method can be used.

The coated alignment film for transfer is guided to a warm air dryer, an infrared dryer, etc., and dried at 30 to 170°C, preferably at 50 to 150°C, and more preferably at 70 to 130°C. The drying time is preferably 0.5 to 30 minutes, more preferably 1 to 20 minutes, further preferably 2 to 10 minutes.

The heating system can be performed in order to align the dichroic dye and the polymerizable liquid crystal compound in the polarizing film more firmly. The heating temperature is preferably within the temperature range in which the polymerizable liquid crystal compound forms a liquid crystal phase.

When the polarizing film composition coating contains a polymerizable liquid crystal compound, it is preferably cured. Examples of the hardening method include heating and light irradiation, and light irradiation is preferred. By hardening, the dichroic pigment can be fixed in an aligned state. Curing is preferably performed in a state where a liquid crystal phase is formed in the polymerizable liquid crystal compound. Alternatively, the polymerizable liquid crystal compound may be cured by irradiation with light at a temperature that exhibits the liquid crystal phase. Examples of light to be irradiated include visible light, ultraviolet light, and laser light. At a point where it is easy to operate, ultraviolet light is preferred.

Although the irradiation intensity varies depending on the type or amount of the polymerization initiator or resin (monomer), for example, it is preferably 100 to 10000 mJ/cm ² based on 365 nm, and more preferably 200 to 5000 mJ/cm ² .

The polarizing film is made by coating the polarizing film composition coating on the alignment control layer, and the pigment is aligned along the alignment direction of the alignment layer, resulting in a polarization transmission axis with a specific direction. However, when the alignment control layer is not provided and is directly coated When transferring an alignment film, the polarizing film forming composition can be hardened by irradiating polarizing light, and the polarizing film can also be aligned. At this time, polarized light in a desired direction (for example, polarized light in an oblique direction) is irradiated with respect to the longitudinal direction of the transfer alignment film. Furthermore, it is preferable that the dichroic dye is strongly aligned along the alignment direction of the polymer liquid crystal by subsequent heat treatment.

The thickness of the polarizing film is 0.1-5 μm, preferably 0.3-3 μm, more preferably 0.5-2 μm.

(phase difference layer) Examples of the phase difference layer include those provided between a polarizer and a liquid crystal cell of a liquid crystal display device for optical compensation, or λ/4 layers, λ/2 layers of circular polarizing plates, and the like. As the liquid crystal compound, a rod-shaped liquid crystal compound or a disk-shaped liquid crystal compound suitable for the purpose such as a positive or negative A plate, a positive or negative C plate, an O plate, etc. can be used.

When used as optical compensation of a liquid crystal display device, the degree of phase difference is appropriately set according to the type of liquid crystal cell and the properties of the liquid crystal compound used in the cell. For example, in the TN mode, it is more suitable to use an O-plate using disc-shaped liquid crystal. In VA mode or IPS mode, it is more suitable to use C-plate (C-plate) or A-plate using rod-shaped liquid crystal compound or disc-shaped liquid crystal compound. In addition, when using a rod-shaped compound for the λ/4 retardation layer and the λ/2 retardation layer of the circularly polarizing plate, it is more suitable to use the A plate. These phase difference layers are not only single layers, but can also be used in combination to form multiple layers.

The liquid crystal compound used for these retardation layers is preferably a polymerizable liquid crystal compound having a polymerizable group such as a double bond in that it can fix the alignment state.

Examples of rod-shaped liquid crystal compounds 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. 2007-119415. A rod-shaped liquid crystal compound having a polymerizable group described in Publication No. 2007-186430 and Japanese Patent Application Laid-Open No. 11-513360. Specific compounds include: 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 In the formula, m and n are integers from 2 to 6, Ph1 and Ph2 are 1,4-benzene group (the 2-position of Ph2 system can be methyl group), NPh is 2,6-naphthyl group. These rod-shaped liquid crystal compounds are commercially available as LC242 produced by BASF, and they can be used.

These rod-shaped liquid crystal compounds can be used in combination with a plurality of them at any ratio.

Examples of discotic liquid crystal compounds include benzene derivatives, triindacene derivatives, cyclohexane derivatives, aza-crown-based macrocycles, phenylacetylene-based macrocycles, etc. Japanese Patent Application Laid-Open 2001 - Various types of items described in Public Gazette No. 155866 are applicable. Among them, as the disc-shaped compound, a compound having a triphylene ring represented by the following general formula (1) is preferably used. In the formula, R ₁ to R ₆ are each independently hydrogen, halogen, alkyl or a group represented by -OX (here, benzyl, acryloyloxy-modified alkoxybenzyl, acryloyloxy-modified alkyl). R ₁ to R ₆ are preferably acryloyloxy-modified alkoxybenzyl represented by the following general formula (2) (here, m is 4 to 10).

The retardation layer can be provided by coating the retardation layer composition paint. The composition coating for the retardation layer may include a solvent, polymerization initiator, sensitizer, polymerization inhibitor, leveling agent, polymerizable non-liquid crystal compound, cross-linking agent, etc. These are the things described in the alignment control layer or the liquid crystal polarizer that can be used.

After applying the composition paint for the retardation layer on the release surface of the alignment film or the alignment control layer, the retardation layer is formed by drying, heating and hardening.

For these conditions, the conditions described in the alignment control layer or the liquid crystal polarizer are also used as preferred conditions.

Sometimes a plurality of retardation layers may be provided. In this case, a plurality of retardation layers may be provided on one alignment film for transfer and then transferred to the object. Alternatively, a plurality of retardation layers may be prepared on one transfer alignment film. If a single retardation layer is provided on the alignment film, these are sequentially transferred to the object.

Alternatively, the polarizing layer and the retardation layer can be provided on one transfer alignment film, and this can be transferred to the object. Furthermore, a protective layer may be provided between the polarizer and the retardation layer, or a protective layer may be provided on the retardation layer or between the retardation layers. These protective layers can also be provided on the alignment film for transfer together with the retardation layer or the polarizing layer, and can be transferred to the object.

Examples of the protective layer include a transparent resin coating layer. The transparent resin may be polyvinyl alcohol, ethylene-vinyl alcohol copolymer, polyester, polyurethane, polyamide, polystyrene, acrylic resin, epoxy resin, etc., and is not particularly limited. Cross-linking agents can also be added to these resins to form a cross-linked structure. Alternatively, a photocurable composition such as hard-coated acrylic or the like may be hardened. In addition, after the protective layer is placed on the alignment film, the protective layer can be rubbed, and no alignment layer is provided on it, but a liquid crystal compound alignment layer is provided.

(Method for manufacturing liquid crystal compound alignment laminated polarizing plate) Next, the manufacturing method of the liquid crystal compound alignment laminated polarizing plate of the present invention is explained. The manufacturing method of the liquid crystal compound alignment laminated polarizing plate of the present invention includes the steps of bonding the polarizing plate and the liquid crystal compound alignment layer of the liquid crystal compound alignment layer transfer laminate of the present invention to form an intermediate laminated body, and forming an intermediate laminated body from the intermediate laminated body. Steps to peel off the alignment film. Hereinafter, a case where the liquid crystal compound alignment layer is used as the liquid crystal compound alignment layer of a circularly polarizing plate will be described as an example. In the case of a circularly polarizing plate, a λ/4 layer is used as the retardation layer (called a liquid crystal compound alignment layer in the transfer laminate). The front-side retardation of the λ/4 layer is preferably 100-180 nm, more preferably 120-150 nm. When using only the λ/4 layer as a circular polarizing plate, the alignment 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, and even more preferably It is 42~48 degrees. When used in combination with a polarizer of a stretched film of polyvinyl alcohol, since the absorption axis of the polarizer generally becomes the length direction of the long polarizer film, when a λ/4 layer is provided on a long alignment film for transfer, it is relatively It is preferable to align the liquid crystal compound so as to fall within the above range with respect to the longitudinal direction of the long alignment film for transfer. Furthermore, when the angle of the transmission axis of the polarizer is different from the above, the angle of the transmission axis of the polarizer is added to achieve the liquid crystal compound alignment with the above relationship.

A circularly polarizing plate is produced by transferring the λ/4 layer in the transfer laminate in which the λ/4 layer and the alignment film are laminated to a polarizing plate. Specifically, the polarizing plate and the λ/4 layer of the transfer laminate are bonded together to form an intermediate laminate, and the alignment film is peeled off from the intermediate laminate. The polarizing plate can also be provided with protective films on both sides of the polarizer, but it is preferably provided with a protective film on only one side. If it is a polarizing plate with a protective film only on one side, it is preferable to laminate a retardation layer on the opposite side (polarizing mirror surface) of the protective film. If protective films are provided on both sides, the retardation layer is preferably attached to the surface on the side of the imaginary image unit. The so-called side of the image unit is a side that does not undergo surface processing such as a low-reflection layer, an anti-reflection layer, and an anti-glare layer that are generally provided on the visual recognition side. The protective film attached to the side of the retardation layer is preferably a non-retardation protective film such as TAC, acrylic, COP, etc.

Examples of polarizers include those made by stretching a PVA-based film alone, or those made by coating PVA on an unstretched base material such as polyester or polypropylene and stretching the base material together. A protective film, or a polarizer containing a liquid crystal compound and a dichroic dye is coated on or transferred to a polarizer protective film, which can be preferably used.

As a method of attaching, conventionally known methods such as adhesives and adhesives can be used. As the adhesive, it is preferable to use a polyvinyl alcohol-based adhesive, an ultraviolet curing adhesive such as acrylic or epoxy resin, or a thermosetting adhesive such as epoxy resin or isocyanate (urethane). Examples of the adhesive include acrylic, urethane, and rubber adhesives. Furthermore, it is also preferable to use an optically transparent adhesive sheet without an acrylic base material.

When using a transfer type as a polarizer, the polarizer can be transferred to the retardation layer (liquid crystal compound alignment layer) of the transfer laminate, and then the polarizer and the retardation layer can be transferred to the target object (polarizer protective film).

As the polarizer protective film on the side opposite to the side where the retardation layer is provided, generally known ones such as TAC, acrylic, COP, polycarbonate, and polyester can be used. Among them, TAC, acrylic, COP, and polyester are preferred. The polyester is preferably polyethylene terephthalate. In the case of polyester, a zero-retardation film with an in-plane retardation of 100nm or less, especially 50nm or less, or a high-retardation film of 3000nm to 30000nm is preferred.

When using a high retardation film, in order to prevent black out or coloration when viewing images with polarized sunglasses, the angle between the transmission axis of the polarizer and the slow axis of the high retardation film is preferably 30 to 60 degrees. The range is preferably within the range of 35 to 55 degrees. In order to reduce iridescence when observed with the naked eye from a shallow oblique direction, the angle between the transmission axis of the polarizer and the slow axis of the high retardation film is preferably 10 degrees or less, more preferably 7 degrees or less, or It is preferably 80 to 100 degrees, and more preferably 83 to 97 degrees.

On the polarizer protective film on the opposite side, an anti-glare layer, an anti-reflective layer, a low-reflective layer, a hard coating layer, etc. can also be provided.

(composite phase difference layer) When the λ/4 layer is used alone, coloration may occur instead of λ/4 in a wide range of the visible light region. Therefore, there are cases where the λ/4 layer and the λ/2 layer are used in combination. The front retardation of the λ/2 layer is preferably 200 to 360 nm, more preferably 240 to 300 nm.

At this time, it is preferable to combine the λ/4 layer and the λ/2 layer and arrange them at an angle of λ/4. Specifically, the angle (θ) between the alignment 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 alignment axis (slow axis) of the λ/2 layer and the alignment axis (slow axis) of λ/4 is preferably in the range of 2θ+45 degrees ±10 degrees, and more preferably in the range of 2θ+45 degrees ±5 degrees. More preferably, it is within the range of 2θ+45 degrees ±3 degrees.

At this time, also when used in combination with a polarizer of a stretched film of polyvinyl alcohol, since the absorption axis of the polarizer generally becomes the length direction of the long polarizer film, when adding a λ/2 layer or a λ/4 layer When the layer is provided on a long alignment film for transfer, it is preferable to align the liquid crystal compound so as to fall within the above range with respect to the longitudinal direction or the perpendicular direction of the length of the long alignment film for transfer. Furthermore, when the angle of the transmission axis of the polarizer is different from the above, the angle of the transmission axis of the polarizer is added to achieve the liquid crystal compound alignment with the above relationship.

As examples of such methods or retardation layers, refer to Japanese Patent Application Laid-Open No. 2008-149577, Japanese Patent Application Laid-Open No. 2002-303722, WO2006/100830, Japanese Patent Application Laid-Open No. 2015-64418, and the like.

Furthermore, in order to reduce color changes when viewed from an oblique direction, it is also preferable to provide a C plate layer on the λ/4 layer. The C plate layer is used to match the characteristics of the λ/4 layer or λ/2 layer, using positive or negative C plate layers.

As a lamination method, for example, if it is a combination of a λ/4 layer and a λ/2 layer, the following various methods can be used. ・A λ/2 layer is placed on the polarizer by transfer, and a λ/4 layer is placed on it by transfer. ・Set the λ/4 layer and λ/2 layer in sequence on the transfer alignment film, and transfer them to the polarizer. ・Set the λ/4 layer, λ/2 layer and polarizing layer in order on the alignment film for transfer, and transfer them to the object. ・Set a λ/2 layer and a polarizing layer on the transfer alignment film in order, transfer them to the object, and transfer the λ/4 layer on top.

In addition, when laminating the C plate, you can also use the method of transferring the C plate layer on the λ/4 layer set on the polarizer, or set the C plate layer on the alignment film, and further set the λ/4 layer on it. There are various methods such as λ/2 layer and λ/4 layer, how to transfer them.

The thickness of the circularly polarizing plate thus obtained is preferably 120 μm or less, more preferably 100 μm or less, further preferably 90 μm or less, particularly preferably 80 μm or less, most preferably 70 μm or less.

(Inspection method of laminate for liquid crystal compound alignment layer transfer) Next, a method for inspecting the laminate for transferring the liquid crystal compound alignment layer of the present invention will be described. The inspection method of the laminate for transferring the alignment layer of the liquid crystal compound of the present invention includes: inspecting the laminate having an alignment direction parallel to the alignment film, or parallel to a direction orthogonal to the alignment direction, or parallel to the flow direction of the alignment film, or parallel to The steps of irradiating linearly polarized light in the direction of electric field vibration in the direction orthogonal to the flow direction from the alignment film surface of the laminate, receiving the light on the alignment layer side of the liquid crystal compound, and checking whether the received light has a matting state. In this manner, in the lamination system for transfer of the liquid crystal compound alignment layer in the present invention, even if the liquid crystal compound alignment layer is a retardation layer, its optical properties can be inspected in a state of being laminated on the alignment film for transfer.

In order to check the optical state of the retardation layer, linearly polarized light parallel or perpendicular to the alignment direction of the transfer alignment film is irradiated, and changes in the polarization state are detected with a photoreceptor installed on the opposite surface of the laminate. When the alignment direction of the alignment film for transfer is parallel, -10 to +10 degrees is preferred, -7 to 7 degrees is more preferred, -5 to 5 degrees is further preferred, and -3 to 3 degrees is particularly preferred. The optimal temperature is -2 to 2 degrees. The alignment direction of the alignment film for transfer is preferably 80 to 100 degrees, more preferably 83 to 97 degrees, further preferably 85 to 95 degrees, particularly preferably 87 to 93 degrees, and most preferably 88 to 88 degrees. 92 degrees. If it exceeds the above range, the polarized light irradiated to the retardation layer or the polarized light passed through is affected by the retardation of the base material and is disturbed, and accurate evaluation may not be possible.

In addition, the angle of linear polarization for each irradiation can also be adjusted according to the alignment direction of the alignment film for transfer, but the inspection becomes complicated. Therefore, it is also preferable to inspect the irradiated linearly polarized light so that it is parallel or perpendicular to the flow direction of the transfer alignment film. Here, the range of parallel or perpendicular is the same as above.

It is preferable to provide a polarizing filter between the photoreceptor and the laminate for transfer of the liquid crystal compound alignment layer (retardation layer) (film to be inspected). In addition, it is preferable to provide a phase difference plate between the laminate for transfer of the liquid crystal compound alignment layer (phase difference layer) and the polarizing filter. When the laminate for transfer of the liquid crystal compound alignment layer (phase difference layer) is When the light that becomes elliptical polarization due to the phase difference layer conforms to the designed elliptical polarization, the phase difference plate is used to convert the elliptical polarization into linear polarization. For example, with such a configuration, when the retardation layer conforms to the design, it can be known that the light detected by the photoreceiver is in an extinction state, but when there is light leakage, it can be known that the retardation layer deviates from the design. It is also possible to set up multiple photoreceptors with slightly different angles of polarizing filters or retardation plates, and detect how much or in which direction the phase difference or alignment direction of the retardation layer deviates.

(Inspection of polarizing layer) When the liquid crystal compound alignment layer is a polarizing layer, the polarizing layer can be inspected by irradiating natural light (non-polarized light) and passing the transmitted light through a polarizing filter to receive light. In addition, inspection can be performed by irradiating the transfer laminate with light that passes through the polarizing filter and becomes linearly polarized light, and receives the transmitted light. In such cases, when the polarizing layer provided on the alignment film for transfer does not meet the design, the polarizing filter is set at an extinction angle.

Furthermore, a plurality of photoreceptors with slightly different angles of polarizing filters can also be installed to detect in which direction the alignment direction deviates and how much it deviates.

Furthermore, in such cases, when irradiating the aforementioned natural light, it is preferable to irradiate from the surface side of the alignment film for transfer, and when irradiating the latter linearly polarized light, it is preferable to irradiate from the polarizing layer. [Example]

Hereinafter, the present invention will be described in more detail with reference to the Examples. However, the present invention is not limited to the following Examples. Appropriate changes can also be made within the scope that is suitable for the purpose of the present invention. They are all included in the present invention. within the technical scope. In addition, the evaluation method of the physical properties in the Examples is as follows.

(1) The angle difference between the alignment direction of the transfer alignment film and the flow direction of the alignment film or the direction orthogonal to the flow direction, and the alignment angle in the width direction of the film First, the film is pulled out from the roll, and the alignment direction is determined at five locations at the two ends (positions 5 cm inside from each end), the center, and the middle portion between the center and both ends. The intermediate portion between the central portion and both end portions is located at a position that bisects the distance between the central portion and both end portions. In addition, the alignment direction is regarded as the slow axis direction of the film determined using a molecular alignment meter (MOA-6004 molecular alignment meter manufactured by Oji Instruments Co., Ltd.). Next, it was investigated whether the alignment direction of the entire film was close to the flow direction (MD) or close to the width direction (TD). Then, when the alignment direction of the entire film is close to the flow direction, the angle between the alignment direction and the flow direction of the film is found at each of the above five places, and the value at the maximum angle is used as the "alignment direction and alignment of the alignment film" The maximum angle between the flow directions of the film. On the other hand, when the alignment direction of the entire film is close to the width direction, find the angle between the alignment direction and the direction orthogonal to the flow direction of the film at each of the above five places, and use the value at the maximum angle as " The maximum value of the angle between the alignment direction of the alignment film and the direction orthogonal to the flow direction of the alignment film. Moreover, among the angles calculated in the above five points, the difference between the maximum value and the minimum value is regarded as "the angle difference in the alignment angle of the film in the width direction." In addition, the angle is regarded as a positive value when the alignment direction is on the same side as the maximum value with respect to the length direction or the width direction, and as a negative value when the alignment direction is on the opposite side with respect to the length direction or width direction. , distinguish positive and negative, and evaluate the minimum value.

(2)Refractive index of alignment film for transfer Cut out a 4cm×2cm rectangle so that the slow axis direction determined in (1) above becomes parallel to the long side, and use it as a sample for measurement. For this sample, the refractive index of the two orthogonal axes (refractive index in the slow axis direction: nx, the refractive index in the fast axis direction (nx) and the slow axis direction) was determined using an Abbe refractometer (NAR-4T, manufactured by ATAGO Co., Ltd., measuring wavelength 589 nm). The refractive index in the direction orthogonal to the axis: ny) and the refractive index in the thickness direction (nz).

(3) The thermal shrinkage rate of the alignment film for transfer at 150°C for 30 minutes in a direction of 45 degrees relative to the MD direction, TD direction, or MD direction, or a direction of 135 degrees relative to the MD direction. Measurement is performed in accordance with JIS C 2318-1997 5.3.4 (dimensional change). Specifically, in the direction to be measured (the direction of 45 degrees with respect to the MD direction, the TD direction, the MD direction, and the direction of 135 degrees with respect to the MD direction), a width of 10 mm and a length of 250 mm are cut out from the film. Attach two marks to this sample at intervals of 200mm, and measure the distance (A) between the two marks under a certain tension of 5gf. Next, place the film into an oven in an environment of 150°C, and heat it at 150±3°C for 30 minutes without load. Then, measure the distance between the two marks (B) under a certain tension of 5gf. The thermal shrinkage rate is calculated by the following formula. Thermal shrinkage rate (%)=(A-B)/A×100

(4) Maximum thermal shrinkage rate at 95℃ Cut the alignment film for transfer cut out from each cutout part of the slit roll into a square shape of 21cm on each side, and store it at 23℃ and 65%RH. Leave it in the environment for more than 2 hours. A circle with a diameter of 80 mm centered on the center of the film was drawn, and the diameter was measured at intervals of 1 degree using a two-dimensional image measuring machine (QUICK IMAGE manufactured by MITUTOYO), assuming that the flow direction of the film was 0 degrees. Here, the film flow direction is regarded as 0 degrees, clockwise (right-hand rotation) is set as a positive angle on the film surface, and counterclockwise (left-hand rotation) is set as a negative angle. To measure the diameter, measure in the range of -90 degrees to 89 degrees, and measure in all directions. Next, the film was heated in hot water at 95°C for 30 minutes, and then left in an environment of 23°C and 65% RH for more than 2 hours. Then, the diameter of the circle is measured at intervals of 1 degree in the same manner as above. Let the diameter before heat treatment be Lo and the diameter in the same direction after heat treatment be L. According to the following formula, calculate the thermal shrinkage rate in each direction. The largest value among the thermal shrinkage rates in all directions is regarded as the maximum. Thermal shrinkage. Also, find the angle between the direction having the maximum thermal shrinkage and MD or TD (whichever value becomes smaller). Thermal shrinkage rate (%)=((L ₀ -L)/L ₀ )×100

(5) Elastic modulus: measured in accordance with JIS C-2318. The sample is cut out from the center of the width direction of the cutting roll obtained by cutting the center portion.

(6)Light transmittance at wavelength 380nm Using a spectrophotometer (U-3500 model manufactured by Hitachi Manufacturing Co., Ltd.), using the air layer as a standard, measure the light transmittance of the alignment film for transfer in the wavelength range of 300 to 500 nm, and obtain the light transmittance of the wavelength of 380 nm. .

(7)Intrinsic viscosity 0.2 g of the resin sample was dissolved in 50 ml of a mixed solvent of phenol/1,1,2,2-tetrachloroethane (60/40 (weight ratio)), and measured at 30° C. using an Oswald viscometer. In addition, for the sample of the surface layer A, a film sample extruded from the A layer alone was prepared and used as a sample.

(8)Light leakage A lower polarizing plate is placed on a surface emitting light source using a white LED using a yellow phosphor as a light source, and a sample laminate having a retardation layer (liquid crystal compound alignment layer) on an alignment film for transfer is placed on top of it. body so that the extinction axis direction (absorption axis direction) of the polarizing plate becomes parallel to the long side direction of the sample laminate. On top of it, place a λ/4 film made of a stretched film of cyclic polyolefin so that the alignment main axis and the extinction axis of the lower polarizing plate are in a 45-degree direction. Place the upper polarizing plate on top of it to polarize the upper side. The extinction axis of the plate is parallel to the extinction axis of the lower polarizing plate. Observe the extinction state in this state. Specifically, among the sample laminates, the matting state of the brightest part was evaluated according to the following criteria. In addition, the sample laminate and the λ/4 film were removed, and the extinction state in which the lower polarizing plate and the upper polarizing plate became a crossed Nicol state was regarded as the extinction state. ◎: There is no bright spot, and the entire area is matted. ○: Slightly more penetrating light than in the extinction state is seen. △: Transmitted light is seen, but the phase difference state can be evaluated. ×: There is a lot of transmitted light, making it difficult to evaluate the phase difference state.

(9)Brightness uniformity Under the same conditions as in (8) above, the uniformity of the extinction state within the sample laminate was evaluated using the following criteria. In addition, the sample laminate and the λ/4 film were removed, and the extinction state in which the lower polarizing plate and the upper polarizing plate became a crossed Nicol state was regarded as the extinction state. ◎: Approximately the same brightness in the entire sample laminate. ○: The brightness is slightly different. △: The brightness difference is small. ×: The brightness difference is large.

(10) The heating alignment direction of the retardation layer deviates Heat the sample laminate in an oven at 120°C for 20 minutes. After cooling to room temperature, a commercially available optical adhesive sheet is attached to the phase difference layer side of the sample laminate, and the adhesive sheet is attached to the glass plate. Finally, the alignment film is peeled off, and the retardation layer is transferred to the glass plate. In a state where a retardation layer is laminated on a glass plate, a glass plate/retardation layer laminate is placed between polarizing plates arranged in crossed Nicols, and the direction of extinction is determined. The angle difference between the matting direction and the longitudinal direction of the alignment film was calculated. The difference between this angle difference and 45 degrees was regarded as the heating alignment direction deviation. The average value of the values obtained five times was calculated and evaluated based on the following criteria. ◎: Within 1 degree. ○: More than 1 degree and less than 2 degrees. △: More than 2 degrees and less than 3 degrees. ×: More than 3 degrees.

(11) Content of ester cyclic terpolymer The polyester resin constituting the release surface side layer of the polyester film is cut off with a cutting knife, and then frozen and pulverized finely. 0.1 g of this crushed resin was dissolved in 3 ml of a mixed solvent of hexafluoroisopropyl alcohol (HFIP)/chloroform (2/3 (volume ratio)). Add 20 ml of chloroform to the resulting solution and mix evenly. 10 ml of methanol was added to the resulting mixed solution to reprecipitate the linear polyester. Next, the mixture was filtered, and the precipitate was washed with 30 ml of a mixed solvent of chloroform/methanol (2/1 (volume ratio)), and further filtered. The filtrate obtained was concentrated to dryness using a rotary evaporator. 10 ml of dimethylformamide was added to the concentrated dry solid to form an ester cyclic trimer measurement solution, and the content of the ester cyclic trimer was determined by liquid chromatography. (Measurement conditions) Device: L-7000 (manufactured by Hitachi Manufacturing Co., Ltd.) Column: μ-Bondasphere C18 5μ 100 angstrom 3.9mm×15cm (manufactured by Waters) Solvent: Eluent A: 2% acetic acid/water (v/v) Eluent B: acetonitrile Gradient B%: 10→100% (0→55 minutes) Flow rate: 0.8ml/minute Temperature: 30℃ Detector: UV-258nm

(12) Precipitation amount of ester cyclic terpolymer on the surface of the release surface of the film. Cut the polyester film into 15 cm × 15 cm, and heat it in an oven at 150° C. for 90 minutes. Then, place the heat-treated film on a 15cm×15cm stainless steel plate with the release surface as the top, and place a 15cm×15cm polysiloxane sheet (thickness 5mm) with a 10cm×10cm hole in the center on it. ), and overlap a stainless steel plate with the same shape (thickness 2mm) as the polysilicone sheet, and fix the peripheral part with a clamp. Next, 4 ml of DMF (dimethylformamide) was placed in the central hole and left for 3 minutes, and then the DMF was recovered. The amount of ester cyclic trimer in the recovered DMF was determined by liquid chromatography. This value was divided by the area of the film in contact with DMF to determine the amount of ester cyclic terpolymer precipitated on the release surface of the film (mg/m ² ). (Measurement conditions) Device: ACQUITY UPLC (manufactured by Waters) Column: BEH-C18 2.1×150mm (manufactured by Waters) Mobile phase: Eluent A: 0.1% formic acid (v/v) Eluent B: Acetonitrile gradient B% : 10→98→98% (0→25→30 minutes) Flow rate: 0.2ml/min Column temperature: 40℃ Detector: UV-258nm

(13) Evaluation of the increase in haze (Δ haze) before and after heat treatment A 50mm x 75mm square was cut from the film, and the initial haze before heat treatment (haze before heating) was measured based on JIS K 7105 "Testing methods for optical properties of plastics" haze. As a measuring device, NDH-300A type turbidity meter manufactured by Nippon Denshoku Industries Co., Ltd. was used. In order to measure the haze after heating, a protective film (PC-T073 manufactured by Fujimori Industrial Co., Ltd.) was closely adhered to the side (back side) of the sample film sheet that had not been evaluated for haze before heat treatment using a roller so as not to introduce air bubbles. With the protective film attached, the film was placed in an oven heated to 150°C, and after 90 minutes, the film was taken out. Then peel off the protective film, measure the haze of the film in the same way as above, and obtain the haze after heating. The difference in haze before and after heating is regarded as Δ haze. ΔHaze(%)=(Haze after heating)-(Haze before heating)

(14) Surface inherent resistance value of polyester film (Ω/sq) According to JIS K 6911, the surface inherent resistance value (Ω) was measured using a surface inherent resistance measuring instrument (manufactured by Takeda Riken Co., Ltd.) in an environment of 23°C and 40% RH with an applied voltage of 500V.

(15) High-speed coating adaptability On the non-coated surface or the oligomer barrier coated surface of the alignment film for transfer, apply the retardation layer forming solution with a gravure coater and dry it. Then, the film quality state near the core of the transfer alignment film (near 450m from the start) was observed and evaluated based on the following criteria. ○: Uniform coating film. ×: Repulsion due to static electricity is seen.

(16) Three-dimensional surface roughness SRa, SRz, SRy A stylus type three-dimensional roughness meter (SE-3AK, manufactured by Kosaka Laboratory Co., Ltd.) was used to measure the length with a cutoff value of 0.25 mm in the length direction of the film under the conditions of a needle radius of 2 μm and a load of 30 mg. 1 mm is measured at a needle feed speed of 0.1 mm/second, divided into 500 points at a pitch of 2 μm, and the height of each point is input into a three-dimensional roughness analysis device (SPA-11). The same operation was performed continuously 150 times at intervals of 2 μm in the width direction of the film, that is, 0.3 mm in the width direction of the film, and the data was input into the analysis device. Next, using an analysis device, the center surface average roughness (SRa), the ten-point average roughness (SRz), and the maximum height (SRy) are obtained.

(17) The number of protrusions with a height difference of 0.5 μm or more (release surface) and 2.0 μm (back surface) on the release surface. Cut out a test piece with a width of 100 mm and a length of 100 mm in the length direction of the film, and sandwich this between two pieces of polarized light. Between the plates, it becomes a cross-Nicol state and is set in a state where the extinction position is maintained. In this state, the NIKON universal projector V-12 is used (measurement conditions: projection lens 50 times, penetrating illumination beam switching knob 50 times, penetrating light inspection), the light penetrates, and the part that can be seen as bright is detected. The long diameter of (wounds and foreign matter) is 50 μm or more. The portion detected in this way was cut into an appropriate size from the test piece, and using a three-dimensional shape measuring device (Micromap TYPE550 manufactured by Ryoka Systems Co., Ltd.; measurement conditions: wavelength 550 nm, WAVE mode, objective lens 10x), for the film surface, Observe and measure from the vertical direction. At this time, for the film surface, when viewed from the vertical direction, the unevenness within 50 μm is regarded as the same flaw and foreign matter, and a rectangle is assumed to cover the same. The length and width of the rectangle are regarded as the length and width of the flaw and foreign matter. Width. Regarding the scratches and foreign matter, the cross-sectional image (SURFACE PROFILE DISPLAY) is used to quantify the number of defects. In addition, the measurement was performed on 20 test pieces and converted into the number of defects per 1 m ² . Count the number of defects with a height difference (difference between the highest point and the lowest point) of 0.5 μm or more on the release surface, and count the number of defects with a height difference of 2.0 μm or more on the back surface.

＜Manufacturing of polyester resin for alignment film for transfer＞ (Manufacturing of polyester resin (PET(X-m))) The esterification reaction tank is heated up, and when it reaches 200°C, 86.4 parts by mass of terephthalic acid and 64.6 parts by mass of ethylene glycol are added. While stirring, 0.017 parts by mass of antimony trioxide and 0.064 parts by mass of antimony trioxide are added as catalysts. 0.16 parts by mass of magnesium acetate tetrahydrate and 0.16 parts by mass of triethylamine. Next, the pressure was increased and the temperature was increased. After performing a pressure esterification reaction under the conditions of 0.34 MPa gauge pressure and 240° C., the esterification reaction tank was returned to normal pressure, and 0.014 parts by mass of phosphoric acid was added. Furthermore, the temperature was raised to 260° C. over 15 minutes, and 0.012 parts by mass of trimethyl phosphate was added. Then, after 15 minutes, a high-pressure disperser was used to perform dispersion treatment. After 15 minutes, the obtained esterification reaction product was transferred to a polycondensation reaction tank, and a polycondensation reaction was performed at 280° C. under reduced pressure.

After the polycondensation reaction is completed, filtration is performed with a Nasolon filter with a 95% cutoff diameter of 5 μm, strands are extruded from the nozzle, and cooling water that has been filtered in advance (pore size: 1 μm or less) is used. It is cooled, solidified, and cut into pellets to obtain polyethylene terephthalate resin (PET (X-m)). The intrinsic viscosity of PET (X-m) is 0.62dl/g, and it contains virtually no inert particles and internal precipitated particles.

(Preparation of polyester resin (PET(Y))) Mix 10 parts by mass of dried ultraviolet absorber (2,2'-(1,4-phenylene)bis(4H-3,1-benzo) -4-one) and 90 parts by mass of PET (Xm) (intrinsic viscosity: 0.62dl/g), using a kneading extruder to obtain a polyethylene terephthalate resin (PET(Y) containing an ultraviolet absorber )).

(Production of low oligomer content polyester (Xs)) The polyester resin (PET (Xm)) was dried under reduced pressure at 160°C, and then the moisture-controlled nitrogen gas with a moisture content of ^15.3g /Nm was added to each 300 liters per hour of circulation per 1kg of crude polyester are heated at 230°C for 12 hours. The inherent viscosity of the obtained polyester was 0.617dl/g, and the content of the cyclic trimer was 0.29 mass%.

<Preparation of easy-adhesion layer components> (Preparation of polyurethane resin D-1) Polyurethane resin D-1 containing aliphatic polycarbonate polyol as a component was produced by the following procedure. . In a 4-neck flask equipped with a mixer, a Daisch cooler, a nitrogen introduction tube, a silica gel drying tube and a thermometer, 43.75 parts by mass of 4,4-diphenylmethane diisocyanate and 12.85 parts by mass of dimethylol are put in Butyric acid, 153.41 parts by mass of polyhexamethylene carbonate diol with a number average molecular weight of 2000, 0.03 parts by mass of dibutyltin dilaurate and 84.00 parts by mass of acetone as a solvent were stirred at 75°C in a nitrogen atmosphere. After 3 hours, confirm that the reaction solution reaches the specified amine equivalent. Next, after cooling the reaction solution to 40° C., 8.77 parts by mass of triethylamine was added to obtain a polyurethane prepolymer solution. Next, add 450 g of water to a reaction vessel equipped with a homodisperser capable of high-speed stirring, adjust the temperature to 25°C, and add the polyurethane prepolymer solution while stirring and mixing for 2000 min ^-1 to perform water dispersion. . Then, acetone and part of water were removed under reduced pressure to prepare a water-soluble polyurethane resin (D-1) having a solid content concentration of 35% by mass. The glass transition point temperature of the obtained polyurethane resin (D-1) was -30°C.

( Production of oxazoline cross-linking agent E-1) In a flask equipped with a thermometer, a nitrogen gas inlet pipe, a reflux cooler, a dropping funnel and a stirrer, 58 parts by mass of ion-exchange water and 58 parts by mass of the aqueous medium were put A mixture of isopropyl alcohol and 4 parts by mass of polymerization initiator (2,2'-azobis(2-formamidinopropane) dihydrochloride). On the other hand, in a dropping funnel, 16 parts by mass of 2-isopropenyl-2-, the polymerizable unsaturated monomer of oxazoline group A mixture of oxazoline, 32 parts by mass of methoxypolyethylene glycol acrylate (average molar addition of ethylene glycol: 9 moles, manufactured by Shin Nakamura Chemical Co., Ltd.) and 32 parts by mass of methyl methacrylate, In a nitrogen atmosphere, drop it at 70°C for 1 hour. After completion of the dropping, the reaction solution was stirred for 9 hours and cooled to obtain a solution with a solid content concentration of 40% by mass. Oxazoline-based water-soluble resin (E-1).

(Preparation of coating liquid for easily adhesive layer) Mix the following coating agents to prepare a coating liquid for easily adhesive layer. Water 55.62 mass% Isopropyl alcohol 30.00 mass% Polyurethane resin (D-1) 11.29 mass% Oxazoline-based cross-linking agent (E-1) 2.26 mass% Particles 0.71 mass% (silica sol with an average particle diameter of 40 nm, solid content concentration 40 mass%) Particles 0.07 mass% (silica sol with an average particle diameter of 450 nm, solid content concentration 40% by mass) Surfactant 0.05% by mass (Silicon based, solid content concentration 100% by mass) (Solid content concentration 10% by mass)

(Manufacture of alignment film roll 1 for transfer) As raw materials for the intermediate layer of the alignment film for transfer, 90 parts by mass of PET (X-m) resin pellets and 10 parts by mass of PET (Y) resin pellets containing an ultraviolet absorber were dried under reduced pressure at 135°C (1 After 6 hours, it is supplied to the extruder 2 (for the middle layer II layer). In addition, as a raw material for the outer layer of the alignment film for transfer, PET (X-m) was dried by a common method, supplied to the extruder 1 (for the outer layer (layer I, layer III)), and melted at 285°C. Each of these two types of polymers is filtered with a stainless steel sintered body filter material (nominal filtration accuracy of 10 μm particles, 95% cutoff), laminated with two types of three-layer blocks, and extruded into sheets from the nozzle. , using the electrostatic application casting method, winding it up on a casting drum with a surface temperature of 30°C, cooling and solidifying, and producing an unstretched film. At this time, the discharge amount of each extruder was adjusted so that the thickness ratio of the I layer, the II layer, and the III layer became 10:80:10.

Next, the easy-adhesion coating liquid is applied on one side of the unstretched PET film by the reverse roller method so that the coating amount after drying becomes 0.08g/ ^m2 , and then it is guided to a dryer and dried at 80°C. 20 seconds.

The unstretched film on which the coating layer was formed was guided to a tenter stretching machine, and while holding the end of the film with a clamp, it was guided to a hot air zone with a temperature of 125°C, and was stretched to 4.0 times in the width direction. Next, while maintaining the stretched width in the width direction, heat setting processing was carried out for 10 seconds at a temperature of 210°C, and a relaxation treatment of 3.0% was further performed. Then, both ends of the cooled film were cut and rolled up at a tension of 0.4 kg/mm ² to obtain a uniaxially aligned PET film with a film thickness of 50 μm (width 1800 cm, alignment film 1 for transfer). The center portion of the obtained film was cut into a width of 50 cm to form a film roll (cut film 1-c) with a length of approximately 500 m. The obtained film was cut from the center part to a width of 50 cm on the right side to obtain a film roll (1-r1) of approximately 500 m in length. The right end of the cut film is 50cm wide and becomes a film roll (1-r2) with a length of about 500m.

(Manufacture of alignment film roll 2 for transfer) In addition to using a heated roller group and an infrared heater, the unstretched film (the easy-adhesive layer has been coated) produced by the same method as the transfer alignment film 1 is heated to 105°C, and then heated to 105°C with a roller having a circumferential speed difference. After extending the group 3.3 times in the direction of travel, guide it to a hot air area with a temperature of 135°C, extend it 3.5 times in the width direction, set the heat setting temperature to other than 225°C, and use the same method as the alignment film 1 for transfer An alignment film 2 for transfer was obtained. The center portion of the obtained film was cut into a width of 50 cm to form a film roll (2-c) with a length of approximately 500 m. The obtained film was cut from the center part to a width of 50 cm on the right side to form a film roll (2-r1) of approximately 500 m in length. The center part of the right half of the cut film is 50cm wide and becomes a film roll (2-r2) with a length of about 500m. The right end of the cut film is 50cm wide and becomes a film roll (2-r3) with a length of about 500m.

(Manufacture of alignment film roll 3-c for transfer) The film roll 1-c is rolled out, passed through a heating oven at 130°C, and rolled up and annealed to obtain an alignment film roll 3-c for transfer. The oven pass time is 20 seconds.

(Manufacture of alignment film roll 4-c for transfer) Except that the relaxation treatment conditions were changed as shown in Table 1, the same procedure as the transfer alignment film 1 was performed to obtain a transfer alignment film roll 4-c. Cut the center section.

(Manufacture of alignment film roll 5-c for transfer) Except for changing the heat setting temperature as shown in Table 1, the same process as the alignment film 1 for transfer was performed, and the alignment film roll 5-c for transfer was obtained. Cut the center section.

(Manufacture of alignment film roll 6-c for transfer) Except for changing the stretching ratio in the width direction as shown in Table 1, the same procedure as the transfer alignment film 1 was performed to obtain a transfer alignment film roll 6-c. Cut the center section.

(Manufacture of alignment film roll 7-c for transfer) The alignment film roll 6-c for transfer is annealed to obtain the alignment film roll 7-c for transfer.

(Manufacture of alignment film roll 8-c for transfer) Using a heated roller group and an infrared heater, heat the unstretched film (the easy-adhesive layer has been coated) produced by the same method as the transfer alignment film 1 to 105°C, and then use a roller group with a circumferential speed difference. , after extending 2.0 times in the direction of travel, guide it to a hot air zone with a temperature of 135°C, and extend it 4.0 times in the width direction, and obtain an alignment film roll 8-c for transfer in the same method as the alignment film 1 for transfer. . Cut the center section.

(Manufacture of the alignment film roll 9-c for transfer) The same process as the alignment film 1 for transfer except that the heat setting temperature was set to 170°C, no relaxation process was performed, and the roll was wound up at a tension of 0.6 kg/mm ² , obtaining the alignment film roll 9-c for transfer. Cut the center section.

(Manufacture of alignment film roll 10-c for transfer) Using a heated roller group and an infrared heater, heat the unstretched film (the easy-adhesive layer has been coated) produced by the same method as the transfer alignment film 1 to 105°C, and then use a roller group with a circumferential speed difference. , after being stretched 4.0 times in the direction of travel, the film was processed at a temperature of 225°C for 10 seconds in a dryer, and a relaxation process of 3.0% was performed using the difference in peripheral speed to obtain an alignment film roll 10-c for transfer. Cut the center section. Furthermore, in the above-mentioned alignment film rolls 1 to 10-c for transfer, the surface that is not coated with the easy-adhesive layer (non-easy-adhesive coating surface) is used as the release surface.

(Manufacture of alignment film roll 11-c for transfer) For the non-adherent coating surface of the alignment film roll 1 (1-c) for transfer, perform corona treatment, apply the following oligomer barrier coating, and dry in a heating oven at 150°C for 3 minutes to obtain transfer. Use alignment film roll 11-c. The thickness of the coating layer is 150nm. ・Melamine cross-linked alkyl modified alkyd resin (Hitachi Chemical Polymer Co., Ltd.: Tesfine 322: solid content 40%) 2.5 parts ・P-Toluenesulfonic acid (manufactured by Hitachi Chemical Polymers: Dryer 900) 0.025 copies ・Toluene 50 parts ・Methyl ethyl ketone 47.2 parts Also, use the oligomer barrier coating side as the release side.

(Production of alignment film roll 12-c for transfer) Instead of the coating liquid for the easy-adhesive layer on one side, the following coating agent (oligomer barrier coating agent) is used, and the following coating agent is used on the other side. Except that silica particles are not included, the process is carried out in the same manner as the transfer alignment film 1 to obtain a transfer alignment film roll 12-c. Cut the center section.・Hexamethoxyhydroxymethylmelamine 52% by mass ・Epocros (manufactured by Nippon Shokubai Co., Ltd.); Amount of oxazoline group 7.7mmol/g 30% by mass ・Polyglycerol polyglycidyl ether 10% by mass ・2-Amino-2-methylpropanol hydrochloride 3% by mass ・Silica particles (average particle size 0.07 μm) 5% by mass (solvent: toluene/MEK=1/1) In addition, the oligomer barrier coating surface containing no silica particles was used as the release surface.

(Manufacture of alignment film roll 13-c for transfer) Except that PET (X-s) was used instead of PET (X-m), the same procedure as the alignment film roll 11-c for transfer was performed to obtain the alignment film roll 13-c for transfer. Cut the center section. Also, use the oligomer barrier coating side as the release side.

(Manufacture of the alignment film roll 14-c for transfer) The process was carried out in the same manner as the alignment film 1 for transfer, except that the following coating agent was used as the coating liquid for the easy-adhesion layer, to obtain the alignment film for transfer 1 with antistatic ability. Alignment film roll 14-c. Water 16.70 mass% Isopropyl alcohol 21.69 mass% Sorbitol 5.00 mass% Thiophene resin 51.02 mass% (Bytron P AG manufactured by STARCK, solid content concentration 1.2 mass%) Polyurethane resin (D-1) 3.81 mass % Aqueous solution of oxazoline cross-linking agent (E-1) 1.22 mass% Particles 0.70 mass% (silica sol with an average particle diameter of 40 nm, solid content concentration 40 mass%) Particles 0.07 mass% (silica sol with an average particle diameter of 450 nm, solid content Concentration 40% by mass) Surfactant 0.05% by mass (Silicon-based, solid content concentration 100% by mass) (Solid content concentration 10% by mass) In addition, the non-adherent coating surface is used as the release surface.

(Manufacture of alignment film roll 15-c for transfer) On the easy-to-adhere coating surface of the alignment film roll 1 (1-c) for transfer, apply Peltron C-4402 (antimony-doped tin oxide particles) through MEK to a solid content concentration of 5%, and heat it in a heating oven at 80°C Dry for 3 minutes and set an antistatic coating with a thickness of 100nm. On the other hand, an oligomer barrier coating is provided on the non-adherent coating surface in the same manner as the transfer alignment film 11-c, thereby obtaining a transfer alignment film roll 15-c with antistatic capability. Also, use the oligomer barrier coating side as the release side.

Table 1 shows the manufacturing conditions and characteristics of each of the alignment film rolls for transfer. [Table 1] Alignment film roll number for transfer 1-c 1-r1 1-r2 2-c 2-r1 2-r2 2-r3 3-c 4-c 5-c 6-c 7-c 8-c 9-c 10-c 11-c 12-c 13-c 14-c 15-c Characteristics of alignment films for transfer printing The angle between MD or TD and the alignment direction (maximum degree) 0.5 2 4 2 5 13 25 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 Angle difference across full width (degrees) 1 2 2.5 4 5 10 20 1 1 1 1 1 1 1 1 1 1 1 1 1 Difference in thermal shrinkage rate between MD direction and TD direction at 150°C (%) 1.4 1.4 1.4 0.9 0.9 0.9 0.9 0.8 0.8 3.1 2.5 1.2 3.2 4.2 1 1.4 1.4 1.4 1.4 1.4 Thermal shrinkage rate at 150℃ in MD direction (%) 1.5 1.5 1.5 1.8 1.8 1.8 1.8 1 2.6 3.4 2.8 1.3 3.7 4.4 1 1.5 1.5 1.5 1.5 1.5 Thermal shrinkage rate at 150℃ in TD direction (%) 0.1 0.1 0.1 0.9 0.9 0.9 0.9 0.2 1.8 0.3 0.3 0.1 0.5 0.2 0 0.1 0.1 0.1 0.1 0.1 Difference in thermal shrinkage rate at 45 degrees (%) 0 0.1 0.1 0 0.1 0.1 0.2 0 0 0 0 0 0 0 0 0 0 0 0 0 Maximum thermal shrinkage rate at 95°C (%) 0.4 0.4 0.4 0.3 0.3 0.3 0.3 0.2 0.5 0.7 0.4 0.3 0.8 1.4 0.4 0.4 0.4 0.4 0.4 0.4 The angle between the maximum thermal shrinkage direction and the MD or TD direction (degrees) 1 1 3 4 7 10 twenty two 1 1 1 1 1 1 1 1 1 1 1 1 1 MD direction elastic modulus (GPa) 2.5 4.3 2.3 2.5 2.5 2.4 2.4 3.7 2.4 6.5 2.5 2.5 2.5 2.5 2.5 Elastic modulus in TD direction (GPa) 6.6 4.5 6.5 6.7 6.6 6.7 6.6 6.1 6.5 2.5 6.6 6.6 6.6 6.6 6.6 f 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.6 Light transmittance at wavelength 380nm (%) 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 The refractive index of the alignment film for transfer in the fast axis direction (ny) 1.587 1.587 1.587 1.653 1.653 1.653 1.653 1.587 1.588 1.588 1.588 1.587 1.587 1.588 1.589 1.587 1.587 1.587 1.587 1.587 The refractive index (nx) of the slow axis direction of the alignment film for transfer 1.692 1.692 1.692 1.689 1.689 1.689 1.689 1.691 1.692 1.691 1.691 1.694 1.679 1.691 1.689 1.692 1.692 1.692 1.692 1.692 manufacturing conditions MD magnification - - - 3.3 3.3 3.3 3.3 - - - - - 2 - 4 - - - - - TD magnification 4 4 4 3.5 3.5 3.5 3.5 4 4 4 4.2 4.2 4 4 - 4 4 4 4 4 HS temperature (degrees) 210 210 210 225 225 225 225 210 210 190 210 210 210 170 225 210 210 210 210 210 TD relaxation rate (%) 3 3 3 3 3 3 3 3 1 3 3 3 3 0 (MD3%) 3 3 3 3 3 annealing n n n n n n n y n n n y n n n n n n n n Annealing temperature (℃) - - - - - - - 130 - - - 130 - - - - - - - - Annealed MD relaxation rate (%) - - - - - - - 2 - - - 2 - - - - - - - -

Experimental example 1A (Formation of alignment control layer by friction treatment) Unroll the alignment film roll 1-c for transfer, cut it into a length of 30cm, and use a bar coater to apply the friction-treated alignment control layer coating with the following composition on the non-easy-to-adhere coating surface, and dry at 80°C for 5 minutes. A film with a thickness of 200nm was formed. Next, the surface of the obtained film was treated with a rubbing roller wrapped with a nylon raised cloth, thereby obtaining an alignment film for transfer on which a rubbing-treated alignment control layer was laminated. The rubbing is performed so that the short side of the cut rectangle becomes 45 degrees. Completely saponified polyvinyl alcohol (weight average molecular weight 800) 2 parts by mass Ion exchange water 100 parts by mass Surfactant 0.5 parts by mass

Next, a retardation layer (liquid crystal compound alignment layer) forming solution having the following composition was coated on the surface subjected to rubbing treatment by a bar coating method. Dry at 110°C for 3 minutes, irradiate ultraviolet rays to cure, and form a λ/4 layer as a retardation layer (liquid crystal compound alignment layer) on the transfer alignment film 1-c to produce a liquid crystal compound alignment layer transfer Laminated body. Rod-shaped liquid crystal compound (LC242 manufactured by BASF) 75 parts by mass of the following compound 20 parts by mass Trimethylolpropane triacrylate 5 parts by mass Irgacure 379 3 parts by mass Surfactant 0.1 part by mass Methyl ethyl ketone 250 parts by mass

Experimental Examples 2A, 3A, 6A to 21A, Experimental Example 2B The liquid crystal compound alignment layer transfer laminates of Experimental Examples 2A, 3A, 6A to 21A, and Experimental Example 2B were manufactured in the same manner as Experimental Example 1A except that the type of the alignment film for transfer was changed as shown in Table 2.

Experimental Examples 4A, 5A, Experimental Example 1B Cut the alignment film roll 1-r2 for transfer to a length of about 30cm, and make the angle between the alignment axis of the film and the direction of the long side of the cut film to be 6 degrees, 9 degrees, or 15 degrees. Adjust the shape into a rectangle as large as possible. Except using this film, in the same manner as Experimental Example 3A, the laminates for liquid crystal compound alignment layer transfer in Experimental Examples 4A, 5A, and Experimental Example 1B were produced.

Table 2 shows the evaluation results of the laminates for transferring the liquid crystal compound alignment layer of Experimental Examples 1A to 21A, 1B, and 2B. In addition, the numerical value of the item "Angle between MD or TD and the alignment direction (maximum angle)" in Experimental Examples 4A, 5A and Experimental Example 1B in Table 2 represents the angle between the long side of the rectangular sample and the alignment axis. [Table 2] Experimental example 1A Experimental example 2A Experimental example 3A Experimental example 4A Experimental example 5A Experimental example 6A Experimental example 7A Experimental example 8A Experimental example 9A Experimental example 10A Experimental example 11A Experimental example 12A Experimental example 13A Experimental example 14A Experimental example 15A Experimental example 16A Experimental example 17A Experimental example 18A Experimental example 19A Experimental example 20A Experimental example 21A Experimental example 1B Experimental example 2B Alignment film roll number for transfer 1-c 1-r1 1-r2 1-r2 1-r2 2-c 2-r1 2-r2 3-c 4-c 5-c 6-c 7-c 8-c 9-c 10-c 11-c 12-c 13-c 14-c 15-c 1-r2 2-r3 The angle between MD or TD and the alignment direction (maximum degree) 0.5 2 4 6 9 2 5 13 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 15 25 Angle difference across full width (degrees) 1 2 2.5 2.5 2.5 4 5 10 1 1 1 1 1 1 1 1 1 1 1 1 1 2.5 20 Difference in thermal shrinkage rate at 150°C between MD direction and TD direction (%) 1.4 1.4 1.4 1.4 1.4 0.9 0.9 0.9 0.8 0.8 3.1 2.5 1.2 3.2 4.2 1 1.4 1.4 1.4 1.4 1.4 1.4 0.9 Thermal shrinkage rate at 150℃ in MD direction (%) 1.5 1.5 1.5 1.5 1.5 1.8 1.8 1.8 1 2.6 3.4 2.8 1.3 3.7 4.4 1 1.5 1.5 1.5 1.5 1.5 1.5 1.8 Thermal shrinkage rate at 150℃ in TD direction (%) 0.1 0.1 0.1 0.1 0.1 0.9 0.9 0.9 0.2 1.8 0.3 0.3 0.1 0.5 0.2 0 0.1 0.1 0.1 0.1 0.1 0.1 0.9 Difference in thermal shrinkage rate at 45 degrees (%) 0 0.1 0.1 0.1 0.1 0 0.1 0.1 0 0 0 0 0 0 0 0 0 0 0 0 0 0.1 0.2 Maximum thermal shrinkage rate at 95°C (%) 0.4 0.4 0.4 0.4 0.4 0.3 0.3 0.3 0.2 0.5 0.7 0.4 0.3 0.8 1.4 0.4 0.4 0.4 0.4 0.4 0.4 0.4 0.3 The angle between the maximum thermal shrinkage direction and the MD or TD direction (degrees) 1 1 3 3 3 4 7 10 1 1 1 1 1 1 1 1 1 1 1 1 1 3 twenty two light leak ◎ ◎ ○ ○ △ ◎ ○ △ ◎ ○ ◎ ○ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ × × Brightness uniformity ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ○ ◎ ◎ ○ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ Alignment angle deviation of the phase difference layer ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ △ ○ ◎ △ × ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎

As is clear from Table 2, experimental examples 1A to 21A that satisfy the requirements of the first invention all have light leakage of ◎, ○, or △, and the phase difference is evaluated in a state where a retardation layer (liquid crystal compound alignment layer) is laminated on the alignment film. system is possible, and the brightness uniformity is also excellent. In contrast, in Experimental Example 1B and Experimental Example 2B, in which the angle between the alignment direction of the alignment film and the flow direction of the alignment film or the direction orthogonal to the flow direction is too large, the light leakage is ×, and there is a phase difference in the layered layer on the alignment film. It is difficult to evaluate the phase difference state in the state of the layer (liquid crystal compound alignment layer).

Furthermore, as clearly seen from Table 2, Experimental Examples 1A to 3A, 6A to 14A, and 16A to 21A that satisfy the requirements of the second invention all have the alignment angle deviation of the retardation layer being ◎, ○, or Δ. In contrast to Experimental Example 15A, in which the difference in thermal shrinkage rate at 150°C between the flow direction (MD direction) of the alignment film and the direction orthogonal to the flow direction (TD direction) is too large, the alignment angle deviation of the retardation layer is × . In the case of Experimental Example 15A, when further heating is performed in the next step, or when the temperature when disposing the retardation layer becomes high, the alignment direction of the retardation layer deviates, and the retardation may not be aligned with the designed alignment on the object. Layers of danger.

Table 3 shows the effects of the oligomer barrier coating and the antistatic layer of the laminates for transferring the liquid crystal compound alignment layer of Experimental Examples 17A to 21A compared with Experimental Example 1A. [table 3] Experimental example 1A Experimental example 17A Experimental example 18A Experimental example 19A Experimental example 20A Experimental example 21A Alignment film roll number for transfer 1-c 11-c 12-c 13-c 14-c 15-c Surface oligomer precipitation amount (150℃×90min, mg/m ² ) 2.7 0.4 0.7 0.2 - - With or without oligomer barrier coating without have have have without have Oligomer barrier coating thickness (μm) - 0.15 0.05 0.15 - 0.15 Surface oligomer content (mass %) 1.05 1.05 1.05 0.48 1.05 1.05 Surface layer (A) raw material polyester CT content (mass %) 1 1 1 0.29 1 1 Haze(%) 0.8 0.8 0.8 0.8 0.8 0.8 nx-ny 0.105 0.105 0.105 0.105 0.105 0.105 The refractive index of the alignment film for transfer in the fast axis direction (ny) 1.587 1.587 1.587 1.587 1.587 1.587 The refractive index (nx) of the slow axis direction of the alignment film for transfer 1.692 1.692 1.692 1.692 1.692 1.692 Antistatic properties (surface resistance Ω/□) 10 ¹⁴ and above - - - 4.5×10 ⁸ 7.8×10 ⁷ ΔHaze 1.4 0.3 0.3 0.1 - - High-speed coating adaptability × ○ ○

As is clear from Table 3, Experimental Examples 17A to 19A that satisfy the requirements of the third invention all have small Δ haze (increase in haze before and after heat treatment), and the increase in haze caused by heat treatment is sufficiently suppressed. In particular, Experimental Example 19A, which uses a polyester with a low oligomer content as the polyester resin constituting the alignment film, has a small oligomer content in the surface layer, so the amount of oligomer precipitation on the surface is also small. As a result, the Δ haze is higher than that of other oligomers. The embodiment is remarkably small and extremely sufficiently suppresses the increase in haze caused by heat treatment. In contrast, Experimental Example 1A, which has a large amount of oligomer precipitation on the surface, has a large Δ haze, and the haze is greatly increased by heat treatment. In addition, Experimental Example 21A provided with an antistatic coating and Experimental Example 20A in which an antistatic agent was added to the easy-adhesive layer are compared with Experimental Example 1A which was not performed. The surface resistance of the film is sufficiently low and the antistatic effect is Excellent performance.

Table 4 shows the surface roughness of the film of Experimental Example 1A as a representative example. Furthermore, in the evaluation of the retardation layer, no pinhole-like or scar-like defects were found. [Table 4] Experimental example 1A Alignment film roll number for transfer 1-c Release surface roughness SRa(nm) 2 Release surface roughness SRz (nm) 28 Release surface roughness SRy(nm) twenty four The number of protrusions with a height difference of more than 0.5μm on the demoulding surface (pieces/m ² ) 0 Back surface roughness SRa(nm) 6 Back surface roughness SRz(nm) 185 Back surface roughness SRy(nm) 282 Number of protrusions above 2μm (pieces/m ² ) 0

Experimental example 22A (Manufacture of a circular polarizing plate as a specific example of a liquid crystal compound alignment laminated polarizing plate) Polyethylene terephthalate with an ultimate viscosity of 0.63 is used as the thermoplastic resin base material to produce an unstretched film with a thickness of 100 μm. On one side of the unstretched film, polyethylene terephthalate with a polymerization degree of 2400 and a saponification degree of 99.9 mol% is coated. Vinyl alcohol aqueous solution and drying to form a PVA layer. The obtained laminated body was stretched to 2 times in the length direction between rollers with different circumferential speeds at 120° C. and wound up. Next, the obtained laminate was treated with a 4% boric acid aqueous solution for 30 seconds, then immersed in a mixed aqueous solution of iodine (0.2%) and potassium iodide (1%) for 60 seconds to dye, and then potassium iodide (3%) and boric acid were used. (3%) mixed aqueous solution for 30 seconds. Furthermore, the laminate was uniaxially stretched in the length direction in a mixed aqueous solution of boric acid (4%) and potassium iodide (5%) at 72°C, then washed with a 4% aqueous potassium iodide solution, and the aqueous solution was removed with an air knife. , dried in an oven at 80°C, cut both ends and rolled up to obtain a base material laminated polarizer with a width of 30cm and a length of 1000m. The total extension magnification is 6.5 times, and the thickness of the polarizer is 5 μm. In addition, the thickness is determined by embedding a base material in epoxy resin with a laminated polarizer, cutting out slices, and observing with an optical microscope to read.

Use an ultraviolet curable adhesive on a super birefringent polyester film (Cosmoshine (R) SRF, thickness 80 μm, manufactured by Toyobo Co., Ltd.), and bond the polarizing mirror surface of the above-mentioned base material laminated polarizer, and then peel off the base material of the laminated polarizer. . Furthermore, a commercially available optical adhesive sheet was laminated on the polarizing mirror. The release film of the adhesive sheet was peeled off, and the liquid crystal compound alignment layer and the adhesive layer of the liquid crystal compound alignment layer transfer laminate of Experimental Example 1A were bonded together. Then, the alignment film in the laminate of Experimental Example 1A was peeled off to obtain a round shape. Polarizing plate. The obtained circular polarizing plate has high anti-reflection function. Furthermore, the slow axis of Cosmoshine(R) SRF is perpendicular to the extinction axis of the polarizer, and the MD direction of Cosmoshine(R) SRF is parallel to the MD direction of the alignment film in the laminate of Experimental Example 1A. [Possibility of industrial application]

The alignment film for transferring the liquid crystal compound alignment layer of the present invention can appropriately evaluate the alignment state of the liquid crystal compound alignment layer (phase difference layer or polarizing layer) provided on the alignment film in a state where the liquid crystal compound alignment layer is laminated thereon. wait. In addition, the alignment film for transferring the liquid crystal compound alignment layer of the present invention can transfer the retardation layer or the polarizing layer in the alignment according to the design while using a stretch film such as polyester which is cheap and has excellent mechanical strength, thereby preventing the display from being damaged. The problem of light leakage. Furthermore, the alignment film for transferring the liquid crystal compound alignment layer of the present invention can effectively prevent the increase in haze or the generation of foreign matter during the heat treatment of the film while using a stretch film such as polyester that is cheap and has excellent mechanical strength. Therefore, a retardation layer or polarizing layer (liquid crystal compound alignment layer) that conforms to the designed alignment can be formed. Therefore, according to the present invention, a phase difference laminated polarizing plate such as a circular polarizing plate can be manufactured with high quality and stability.

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Claims (28)

An alignment film for transferring a liquid crystal compound alignment layer, which is an alignment film used to transfer a liquid crystal compound alignment layer to an object, wherein the alignment direction of the alignment film is one of the direction orthogonal to the flow direction of the alignment film or the flow direction. The angle between the two ends is measured at five locations in the width direction of the film: 5 cm inside from each end, the two ends, the center, and the middle portion between the center and both ends. The maximum value is below 14 degrees. The alignment film is used to align the liquid crystal compound alignment layer by any one of the following methods (A1) to (D1). (A1) The alignment film is subjected to rubbing treatment, and through the rubbing treatment The alignment control force of the surface aligns the liquid crystal compound alignment layer provided on the rubbing surface of the alignment film; (B1) Coating a liquid crystal compound layer on the alignment film, and aligning the liquid crystal compound layer by irradiating polarized light; (C1) Set an alignment control layer on the alignment film, rub the alignment control layer, and align the liquid crystal compound alignment layer set on the alignment control layer through the alignment control force of the rubbing surface; (D1) Set alignment on the alignment film The control layer irradiates the alignment control layer with polarized light, and uses the alignment control force of the alignment control layer to align the liquid crystal compound alignment layer provided on the alignment control layer. For example, in the alignment film for transferring a liquid crystal compound alignment layer according to claim 1, the angle difference between the alignment angles of the alignment film in the width direction is less than 7 degrees. An alignment film for transferring a liquid crystal compound alignment layer according to claim 1, wherein the alignment film is a polyester film. Such as the alignment film for transferring the liquid crystal compound alignment layer of claim 1, which When the refractive index in the slow axis direction of the alignment film is nx and the refractive index in the fast axis direction is ny, nx-ny is 0.05 or more and 0.12 or less. For example, the alignment film for transfer of the liquid crystal compound alignment layer of claim 4, wherein the ny is not less than 1.58 and not more than 1.62, and the nx is not less than 1.68 and not more than 1.71. Such as the alignment film for transfer of liquid crystal compound alignment layer of claim 1, wherein the heat shrinkage rate of the alignment film at 150°C for 30 minutes in the flow direction is the same as the heat shrinkage rate of the alignment film at 150°C for 30 minutes in the direction orthogonal to the flow direction. The difference in rates is less than 4%. An alignment film for transfer of a liquid crystal compound alignment layer as claimed in claim 6, wherein the thermal shrinkage rate at 150° C. for 30 minutes in a direction of 45 degrees with respect to the flow direction of the alignment film is the same as that with respect to the flow direction of the alignment film. The difference in thermal shrinkage rates between 135 degrees and 150°C for 30 minutes is less than 4%. An alignment film for transferring a liquid crystal compound alignment layer according to claim 1, wherein the three-dimensional arithmetic mean roughness SRa of the release surface of the alignment film is 1 nm or more and 10 nm or less. Such as the alignment film for transfer of the liquid crystal compound alignment layer of claim 1, wherein the alignment film is an aligned polyester film, and the surface of the release surface of the aligned polyester film after heating the aligned polyester film at 150° C. for 90 minutes. The precipitation amount of polyester cyclic terpolymer is 1.0 mg/ ^m2 or less. A laminate for transferring a liquid crystal compound alignment layer, which is a laminate in which a liquid crystal compound alignment layer and an alignment film are laminated, wherein in the case of the alignment film, the alignment direction of the alignment film is orthogonal to the flow direction of the alignment film or is orthogonal to the flow direction The angle between the directions is measured at 5 places in the width direction of the film, 5 cm inside from each end, the two ends, the center, and the middle part between the center and both ends. The maximum value among the values is Below 14 degrees, the laminated system is obtained by any one of the following methods (A2) ~ (D2), (A2) includes the following steps in sequence, the step of rubbing the alignment film to impart the alignment control function , the step of arranging a liquid crystal compound alignment layer on an alignment film endowed with an alignment control function; (B2) a method including the following steps in sequence, a step of coating a liquid crystal compound on the alignment film, irradiating the liquid crystal compound with polarized light, so that the liquid crystal The steps of aligning the compound and serving as the alignment layer of the liquid crystal compound; (C2) a method including the following steps in sequence, the steps of preparing the alignment film, the steps of arranging the alignment control layer on the alignment film, and rubbing the alignment control layer to impart alignment The steps of controlling the function, the steps of setting the alignment layer of the liquid crystal compound on the alignment control layer; (D2) the method including the following steps in sequence, the steps of preparing the alignment film, the steps of setting the alignment control layer on the alignment film, and controlling the alignment The step of irradiating the layer with polarized light to impart an alignment control function, and the step of providing a liquid crystal compound alignment layer on the alignment control layer. A laminate for transferring a liquid crystal compound alignment layer according to claim 10, wherein the angle difference between the alignment angles of the alignment film in the width direction is 7 degrees or less. A laminate for transferring a liquid crystal compound alignment layer according to claim 10, wherein the alignment film is a polyester film. Such as the laminate for transferring the liquid crystal compound alignment layer of claim 10, When the refractive index in the slow axis direction of the alignment film is nx and the refractive index in the fast axis direction is ny, nx-ny is 0.05 or more and 0.12 or less. For example, in claim 13, the laminate for transferring a liquid crystal compound alignment layer, wherein the ny is 1.58 or more and 1.62 or less, and the nx is 1.68 or more and 1.71 or less. A laminate for transferring a liquid crystal compound alignment layer according to claim 10, wherein the alignment film has a heat shrinkage rate of 150°C for 30 minutes in the flow direction and a heat shrinkage rate of the alignment film at 150°C for 30 minutes in the direction orthogonal to the flow direction. The difference in rates is less than 4%. A laminate for transfer of a liquid crystal compound alignment layer according to claim 10, wherein the thermal shrinkage rate at 150° C. for 30 minutes in a direction of 45 degrees with respect to the flow direction of the alignment film is the same as that with respect to the flow direction of the alignment film. The difference in thermal shrinkage rates between 135 degrees and 150°C for 30 minutes is less than 4%. A laminate for transferring a liquid crystal compound alignment layer according to claim 10, wherein the three-dimensional arithmetic mean roughness SRa of the release surface of the alignment film is 1 nm or more and 10 nm or less. The laminate for transfer of the liquid crystal compound alignment layer of claim 10, wherein the alignment film is an aligned polyester film, and the surface of the release surface of the aligned polyester film after heating the aligned polyester film at 150° C. for 90 minutes. The precipitation amount of polyester cyclic terpolymer is 1.0 mg/ ^m2 or less. A method for manufacturing a liquid crystal compound alignment laminated polarizing plate, which is characterized by comprising the following steps 1 to 4. Step 1: the step of preparing an alignment film. For the alignment film, the alignment direction of the alignment film and the flow of the alignment film direction or the angle between directions orthogonal to the direction of flow, measured 5 cm inside from each end in the width direction of the film The maximum value among the values measured at five locations at both ends, the center, and the middle portion between the center and both ends is 14 degrees or less. Step 2: Through the following (A3)~( The step of obtaining a laminated body for transferring a liquid crystal compound alignment layer by any method in D3), step 3: the step of bonding the polarizing plate and the side surface of the liquid crystal compound alignment layer of the laminated body for transferring a liquid crystal compound alignment layer to form an intermediate laminated body , and step 4: the step of peeling off the alignment film from the intermediate laminate, (A3) a method including the following steps in sequence, a step of rubbing the alignment film to impart an alignment control function, and a step of imparting an alignment control function to the alignment film The step of providing a liquid crystal compound alignment layer on the alignment film; (B3) a method including the following steps in sequence, the step of coating the liquid crystal compound on the alignment film, and irradiating the liquid crystal compound on the alignment film with polarized light to align the liquid crystal compound and serve as a liquid crystal compound The steps of aligning the layer; (C3) a method including the following steps in sequence, the step of preparing the alignment film, the step of setting the alignment control layer on the alignment film, the step of rubbing the alignment control layer to impart the alignment control function, The step of arranging a liquid crystal compound alignment layer on the alignment control layer; (D3) a method including the following steps in sequence, the step of preparing the alignment film, the step of arranging the alignment control layer on the alignment film, and irradiating the alignment control layer with polarized light to impart alignment The steps of controlling functions and the steps of setting a liquid crystal compound alignment layer on the alignment control layer. As claimed in claim 19, the method for manufacturing a liquid crystal compound alignment layered laminated polarizing plate, wherein the angle difference between the alignment angles of the alignment film in the width direction is less than 7 degrees. As claimed in claim 19, the method for manufacturing a liquid crystal compound alignment laminated polarizing plate, wherein the alignment film is a polyester film. As claimed in Claim 19, the method for manufacturing a liquid crystal compound alignment laminated polarizing plate, wherein the refractive index in the slow axis direction of the alignment film is nx and the refractive index in the fast axis direction is ny, nx-ny is 0.05 or more and 0.12 the following. For example, the method for manufacturing a liquid crystal compound aligned laminated polarizing plate of claim 22, wherein the ny is 1.58 or more and 1.62 or less, and the nx is 1.68 or more and 1.71 or less. As claimed in claim 19, the method for manufacturing a liquid crystal compound alignment laminated polarizing plate, wherein the thermal shrinkage rate of the alignment film at 150°C for 30 minutes in the flow direction is the same as the heat shrinkage rate of the alignment film at 150°C for 30 minutes in the direction orthogonal to the flow direction. The difference in shrinkage is less than 4%. The method for manufacturing a liquid crystal compound alignment laminated polarizing plate according to claim 19, wherein the thermal shrinkage rate at 150° C. for 30 minutes in a direction of 45 degrees with respect to the flow direction of the alignment film is proportional to the flow direction of the alignment film. It is said that the difference in thermal shrinkage rate between 135° and 150°C for 30 minutes is less than 4%. As claimed in claim 19, the method for manufacturing a liquid crystal compound alignment laminated polarizing plate, wherein the three-dimensional arithmetic mean roughness SRa of the release surface of the alignment film is 1 nm or more and 10 nm or less. The method for manufacturing a liquid crystal compound aligned laminated polarizing plate according to claim 20, wherein the alignment film is an aligned polyester film, and the surface of the release surface of the aligned polyester film after heating the aligned polyester film at 150°C for 90 minutes The precipitation amount of polyester cyclic terpolymer is 1.0mg/ ^m2 or less. A method for inspecting a laminate for transfer of a liquid crystal compound alignment layer, which is a method for inspecting the alignment state of the liquid crystal compound alignment layer in the laminate of claim 10, which is characterized by including: placing an alignment direction parallel to the alignment film , or linearly polarized light parallel to the direction orthogonal to the alignment direction, or parallel to the flow direction of the alignment film, or parallel to the electric field vibration direction in the direction orthogonal to the flow direction, is irradiated from the alignment film surface of the laminate, and The step of aligning the liquid crystal compound layer side to receive light.