KR20210082159A - Alignment film for liquid crystal compound alignment layer transfer - Google Patents

Abstract

The present invention uses a stretched film, such as a polyester, which is inexpensive and has excellent mechanical strength, as a transfer film for transferring the liquid crystal compound alignment layer, and the alignment state of the liquid crystal compound alignment layer provided on the transfer film, etc. A transfer film that can be evaluated even in a laminated state, reduces the problem of misalignment of the orientation direction of the transferred liquid crystal compound orientation layer, and allows the liquid crystal compound orientation layer to be transferred with the orientation as designed, and reduces the light leakage of the display The liquid crystal compound alignment layer of the orientation as designed by effectively preventing the rise of the haze of the film in the formation process of the film for transfer which can prevent a problem, or the liquid crystal compound alignment layer on a film, and generation|occurrence|production of the foreign material in a film, It provides a film for transfer that can form a. An alignment film for transferring a liquid crystal compound alignment layer to an object, wherein the angle between the alignment direction of the alignment film and the direction orthogonal to the flow direction or flow direction of the alignment film is 5 cm inward from each end in the width direction of the film It is characterized in that it is 14 degrees or less from the maximum of the values measured at both ends, the central part, and the middle part in the middle of the central part and both ends at the point of . An alignment film for transferring a liquid crystal compound alignment layer to an object, wherein the thermal contraction rate for 30 minutes at 150°C in the flow direction of the alignment film and the thermal contraction rate at 150°C for 30 minutes in the direction orthogonal to the flow direction of the alignment film It is characterized in that the difference is 4% or less. An oriented polyester film for transferring a liquid crystal compound alignment layer to an object, characterized in that the precipitation amount of the ester cyclic trimer on the surface of the release surface of the oriented polyester film after heating at 150° C. for 90 minutes is 1.0 mg/m 2 or less do it with

Description

Alignment film for liquid crystal compound alignment layer transfer

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

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

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

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

In these transfer methods, various things are introduced as a base material for transcription|transfer, Among them, transparent resin films, such as polyester, triacetyl cellulose, and cyclic polyolefin, are illustrated many. Unstretched films, such as triacetyl cellulose and cyclic polyolefin, do not have birefringence, and are preferable in that the state of the retardation layer can be inspected (evaluated) in a state where the retardation layer is provided on the film substrate, but these films are expensive Not only that, when the film was thinned, the mechanical strength was inferior, and it was not necessarily optimal.

On the other hand, although a stretched film is excellent in mechanical strength compared with an unstretched film, and is preferable as a film base material for transcription|transfer, since it has birefringence, evaluation of retardation layer was difficult. In particular, a biaxially stretched polyester film is relatively inexpensive, has excellent mechanical strength and heat resistance, and is very suitable as a film substrate for transfer in this respect. However, the polyester film is a film substrate from the viewpoint of having large birefringence. It was difficult to evaluate the retardation layer in the state in which the liquid crystal compound orientation layer (retardation layer) was laminated|stacked on it.

Therefore, in the case of evaluating the retardation layer in the stretched film, it is necessary to evaluate after transferring to an object (other transparent resin film, polarizing plate, etc.), to peel the retardation layer to evaluate only the retardation layer, or to transfer to glass or the like to evaluate there was. As for the evaluation method after transferring to the object, when there is a problem with the retardation layer, it is necessary to dispose of it as an out-of-standard product including a normal product, such as a polarizing plate, and productivity is inferior. The method of peeling and evaluating the retardation layer had a problem that could not be evaluated when the retardation layer became thin. Moreover, in the method of peeling and evaluating, or the method of transcribe|transferring to glass, it became sample extraction evaluation, and evaluation of the whole quantity was not possible.

In addition, the stretched film is superior in mechanical strength compared to the unstretched film and is preferable as a film substrate for transfer, but the orientation direction of the transferred retardation layer does not become the orientation direction as designed, and a problem of deviation therefrom frequently occurs. there was. And when the polarizing plate which has the phase difference of the orientation direction shifted|deviated from such a design is used for a display, problems, such as light leakage, may be produced. In particular, a stretched polyester film such as a biaxially stretched polyester film is relatively inexpensive and has excellent mechanical strength and heat resistance. From this point of view, it is very preferable as a film substrate for transfer, but in a polyester film, this orientation direction , and the problem of light leakage due to it was particularly remarkable.

Moreover, polyester films, such as a biaxially stretched polyester film, are comparatively cheap and have outstanding mechanical strength and heat resistance, and are very preferable as a film base material for transcription|transfer from this point, but a polyester film is a film base material for transcription|transfer. In the process of forming a retardation layer (liquid crystal compound orientation layer) thereon and producing a laminate when used as a film, there was a problem in that the haze of the film rises or foreign substances are generated in the film. And, due to such raised haze and foreign material, polarization|polarized-light was disturbed at the time of the ultraviolet irradiation for controlling the orientation of a liquid crystal compound, and there existed a problem that it did not become an orientation direction as designed.

In addition, a method for producing a polarizing plate by transferring a polarizing layer (liquid crystal compound alignment layer) containing a liquid crystal compound and a dichroic dye laminated on a transfer film to a protective film has also been known, but in this case, the same problem as above there was.

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

This invention was made|formed against the subject of such prior art. That is, the first object of the present invention is to use a stretched film such as polyester, which is inexpensive and has excellent mechanical strength, as a transfer film for transferring a liquid crystal compound alignment layer, and a liquid crystal compound alignment layer provided on the transfer film ( An object of the present invention is to provide a transfer film that can evaluate the orientation state of the retardation layer or the polarizing layer) even in a state in which it is laminated on the transfer film.

A second object of the present invention is to reduce the misalignment of the orientation direction of the transferred retardation layer or polarizing layer while using a stretched film such as polyester which is inexpensive and has excellent mechanical strength as a transfer film for transferring the liquid crystal compound alignment layer. An object of the present invention is to provide a transfer film capable of reducing the problem and transferring the retardation layer or the polarizing layer in the orientation as designed, thereby preventing the problem of light leakage of the display.

A third object of the present invention is a retardation layer or a polarizing layer (liquid crystal compound alignment) on the film, while using a stretched film such as a polyester which is inexpensive and has excellent mechanical strength as a transfer film for transferring the liquid crystal compound alignment layer. To provide a transfer film capable of effectively preventing a rise in the haze of the film in the formation process of the film and the generation of foreign substances in the film, and forming a retardation layer or a polarizing layer (liquid crystal compound alignment layer) of the orientation as designed. would like to

As a result of earnestly examining this inventor in order to achieve the 1st objective, as an oriented film, even if it is a location where the angle between the orientation direction and the direction orthogonal to the flow direction or flow direction of an orientation film becomes the maximum, a specific angle By using the thing controlled below, said conventional problem did not arise and it discovered that evaluation of retardation image could be performed favorably also in the state which laminated|stacked the liquid crystal compound orientation layer on the orientation film.

The present inventors, in order to achieve the second object, when a conventional stretched film is used as a film substrate for transfer, the cause of the orientation direction of the transferred retardation layer or the polarizing layer does not become the orientation direction as designed. reviewed. As a result, although the stretched film of the substrate is thermally contracted to some extent by heat treatment when the liquid crystal compound is oriented on the stretched film as the substrate to form a retardation layer or a polarizing layer, the degree of this thermal contraction is in two directions orthogonal to the stretched film. Because it is greatly different from, distortion occurs in the base film after heat shrinkage, and since this distortion adversely affects the orientation direction of the retardation layer or polarizing layer formed on the base film, the orientation direction of the retardation layer or polarizing layer is It was discovered that it shifted|deviated from the orientation direction as designed. And as a result of this inventor earnestly examining about the method of effectively preventing this distortion of a base film, as an oriented film which is a base film, the flow direction (MD direction), and the direction (TD direction) orthogonal to a flow direction, Even if there is a non-uniformity in the thermal contraction rate of the film between the two, by using the one whose difference is controlled within a specific range, the above conventional problems do not occur, and the retardation layer or the polarizing layer can be transferred in the orientation as designed, It was found that it did not cause the problem of light leakage.

MEANS TO SOLVE THE PROBLEM This inventor in order to achieve the 3rd objective, when using the conventional stretched polyester film as a film base material for transcription|transfer, in the formation process of the retardation layer and polarizing layer (liquid crystal compound orientation layer) on a film. The cause that the haze of a film rises or a foreign material generate|occur|produces in a film was examined. As a result, the polyester resin constituting the polyester film inevitably contains an ester cyclic trimer (oligomer) as a by-product of the reaction during polymerization in the production process. When used as a base film for use, these oligomers precipitate on the surface of a base film by the heat treatment in the process of apply|coating and heating a liquid crystal compound on it to form a liquid crystal compound orientation layer (retardation layer or a polarizing layer). And, as a result, it discovered that the raise of a haze and generation|occurrence|production of a foreign material were caused. And as a result of this inventor earnestly examining about the method of effectively preventing such a raise of such a haze at the time of heat processing of the oriented polyester film for transcription|transfer and generation|occurrence|production of a foreign material, the amount of oligomer precipitation of a polyester film is controlled within a specific range It discovered that the phase difference layer and polarizing layer (liquid crystal compound orientation layer) of the orientation as designed could be formed without generating said conventional problem by using what was used.

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 to an object, wherein the angle between the alignment direction of the alignment film and the flow direction of the alignment film or a direction orthogonal to the flow direction is from each end in the width direction of the film An alignment film for liquid crystal compound alignment layer transfer, characterized in that it is 14 degrees or less from the maximum value measured at 5 places of the both ends, the central part, and the middle part in the middle of the central part and the both ends at a point of 5 cm inward.

(2) The orientation film for liquid crystal compound orientation layer transfer as described in (1) characterized by the angular difference of the orientation angle in the width direction of an orientation film being 7 degrees or less.

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

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

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

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

The invention for achieving the second object has the following structures (1) to (6).

(1) As an alignment film for transferring a liquid crystal compound alignment layer to an object, heat shrinkage at 150°C for 30 minutes in the flow direction of the alignment film and heat at 150°C for 30 minutes in a direction orthogonal to the flow direction of the alignment film The alignment film for liquid crystal compound alignment layer transfer, characterized in that the difference with the shrinkage is 4% or less.

(2) The difference between the thermal contraction rate for 30 minutes at 150° C. in the direction of 45 degrees with respect to the flow direction of the oriented film and the thermal contraction rate for 30 minutes at 150° C. for 30 minutes at 135 degrees with respect to the flow direction of the oriented film is 4% or less The alignment film for liquid crystal compound alignment layer transfer as described in (1) characterized by the above-mentioned.

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

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

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

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

The invention for achieving the third object has the following structures (1) to (6).

(1) As an orientation polyester film for transferring a liquid crystal compound orientation layer to a target object, the precipitation amount of the ester cyclic trimer in the surface of the release surface of an orientation polyester film after heating at 150 degreeC for 90 minutes is 1.0 mg/m ^The oriented polyester film for liquid crystal compound alignment layer transfer, characterized in that it is 2 or less.

(2) Content of ester cyclic trimer in the polyester resin which comprises the release surface side layer of an oriented polyester film is 0.7 mass % or less, The oriented polyester film for liquid crystal compound orientation layer transfer as described in (1) characterized by the above-mentioned.

(3) The orientation polyester film for liquid crystal compound orientation layer transcription|transfer as described in (1) or (2) in which the coating layer which prevents precipitation of an ester cyclic trimer is provided in the mold release surface of an orientation polyester film.

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

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

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

According to the first invention, the alignment state of the 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 which is inexpensive and has excellent mechanical strength. can also be evaluated.

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

According to the third invention, while using a polyester stretched film that is inexpensive and has excellent mechanical strength, it is possible to effectively prevent a rise in haze and generation of foreign matter during heat treatment of the film, so that the retardation layer and polarization of the orientation as designed A layer (a liquid crystal compound alignment layer) can be formed.

The alignment film of the first invention is for transferring a liquid crystal compound alignment layer to an object (other transparent resin film, polarizing plate, etc.), between the alignment direction of the alignment film and the flow direction of the alignment film or a direction orthogonal to the flow direction It is characterized in that the angle of is 14 degrees or less at the maximum position.

The alignment film of the second invention is for transferring the liquid crystal compound alignment layer to an object (other transparent resin film, polarizing plate, etc.), and the thermal contraction rate for 30 minutes at 150° C. in the flow direction (MD direction) of the alignment film, The difference with the thermal contraction rate for 30 minutes at 150 degreeC in the direction (TD direction) orthogonal to the flow direction of an orientation film is 4 % or less, It is characterized by the above-mentioned.

The oriented polyester film of the third invention is for transferring the liquid crystal compound alignment layer to an object (other transparent resin film, polarizing plate, etc.), and is heated at 150° C. for 90 minutes on the surface of the release surface of the oriented polyester film. The precipitation amount of the ester cyclic trimer in this is 1.0 mg/m<^2> or less, It is characterized by the above-mentioned. In addition, hereafter, an oriented polyester film may be simply called an oriented film. In addition, when an oligomer block coating layer, a release layer, a flattening coating layer, a lubricating coating layer, an antistatic coating layer, etc. described later are provided, including these layers, an oriented polyester film or an oriented film There are cases.

As resin used for an orientation film, it is preferable to have birefringence, polyester, polycarbonate, polystyrene, polyamide, polypropylene, cyclic polyolefin, and triacetyl cellulose are more preferable, polyester is still more preferable, and polyethylene Terephthalate is particularly preferred.

The oriented film may be a single layer or multiple layers by coextrusion may be sufficient as a structure. In the case of multiple layers, the structure of the surface layer (layer A on the release surface)/back layer (B), A/intermediate layer (C)/A (the release surface layer and the back surface layer are the same), A/C/B, etc. can be heard

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

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

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

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

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

Therefore, the orientation state of the retardation layer is, for example, linearly polarized light having a vibration direction parallel to or perpendicular to the flow direction of the film to the retardation layer from the oriented film side for transfer, and light that becomes elliptically polarized light in the retardation layer can be inspected (evaluated) by passing through a light-receiving-side retardation plate for returning the 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 detecting it by the light-receiving element. With respect to the retardation layer provided on the orientation film for transfer, if the light passing through the light-receiving-side retardation plate, which becomes linearly polarized light in the case of the retardation and orientation direction as designed, is in a quenched state, it can be seen that the retardation layer is as designed. have. Conversely, if there is light leakage, it turns out that it deviates from design.

However, when the orientation direction of the orientation film for transfer is parallel (MD) to the flow direction of the orientation film or deviates from perpendicular (TD), the linearly polarized light passing through the orientation film for transfer becomes elliptically polarized light, and light leakage occurs. , it becomes difficult to accurately evaluate the retardation layer. The present invention enables accurate evaluation of the retardation layer by minimizing this shift.

The lower limit of the angle (maximum point) between MD or TD of the orientation film for transfer of the present invention and the orientation direction is preferably 0 degrees. In addition, the upper limit of the angle between MD or TD of the oriented film for transfer of the present invention and the orientation direction is preferably 14 degrees at the maximum, more preferably 7 degrees, still more preferably 5 degrees, and particularly preferably Preferably it is 4 degrees, most preferably it is 3 degrees. When it exceeds the above, it may become difficult to evaluate the orientation state of retardation layer (liquid crystal compound orientation layer).

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

In order to lower the surface oligomer precipitation amount, it is preferable to provide a coating layer (oligomer block coating layer) that blocks precipitation of an oligomer (ester cyclic trimer) on the surface of the oriented film for transcription.

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

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

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

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

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

When the orientation 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, still more preferably It is 0.53 dl/g. If it is less than the above, the impact resistance of the film may be inferior. Moreover, it may become difficult to form into a film, or it may be inferior to the uniformity of thickness. The upper limit of IVf is preferably 0.9 dl/g, more preferably 0.8 dl/g, still more preferably 0.7 dl/g. When it exceeds the above, thermal contraction rate may become high. Moreover, it may become difficult to perform film forming.

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

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

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

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

In the oriented film for transfer of the present invention, the lower limit of the refractive index nx in the slow axis direction - the refractive index ny in the fast axis direction is preferably 0.005, more preferably 0.01, still more preferably 0.02, particularly preferably 0.03. , most preferably 0.04, and most preferably 0.05. If it is less than the above, it may be difficult to realistically achieve the numerical value. Moreover, Preferably the upper limit of nx-ny is 0.15, More preferably, it is 0.13, More preferably, it is 0.12. If the above is exceeded, it may be difficult to realistically achieve the numerical value. In particular, in the case of a polyethylene terephthalate film, it is preferable that the value of nx-ny is the above.

In the case of biaxial stretching, the minimum of nx-ny becomes like this. Preferably it is 0.005, More preferably, it is 0.01. If it is less than the above, it may be difficult to realistically achieve the numerical value. Moreover, in the case of biaxial stretching, Preferably the upper limit of nx-ny is 0.05, More preferably, it is 0.04, More preferably, it is 0.03. If the above is exceeded, it may be difficult to realistically achieve the numerical value.

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

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

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

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

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

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

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

(Roughness of the heterogeneous surface)

It is preferable that the release surface (A-layer surface) of the oriented film for transcription|transfer of this invention is smooth.

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

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

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

The upper limit of the number of projections of 0.5 µm or more on the release surface of the oriented film for transfer of the present invention is preferably 5 pieces/m2, more preferably 4 pieces/m2, still more preferably 3 pieces/m2, especially Preferably it is 2 pieces/m<2>, and most preferably it is 1 piece/m<2>.

When the roughness of the release surface exceeds the above, the alignment state or phase difference as designed does not occur in the minute portion of the liquid crystal compound alignment layer formed on the transfer alignment film of the present invention, and pinhole-like or scratch-like defects occur. there is If this is an orientation layer, it is thought that it is the cause that the orientation layer of a convex part peels off at the time of rubbing, and the rubbing of the base part of a convex part, and a recessed part is inadequate. Moreover, when particle|grains are included in a release surface layer, it is thought that the cause is that the particle|grains fall off at the time of rubbing, and the surface is damaged. In addition, whether it is a rubbing alignment layer or a photo-alignment layer, when it is wound in a state in which the alignment layer is provided, a hole is formed in the alignment layer of the convex portion by rubbing with the back surface layer, or the alignment is disturbed by pressure. I think. It is considered that the cause is that the alignment of the liquid crystal compound does not occur in the minute portion when the liquid crystal compound alignment layer is provided on the alignment layer due to the defect of the alignment layer.

In the case of the liquid crystal compound alignment layer, when the liquid crystal compound is applied, the thickness of the liquid crystal compound alignment layer becomes thin in the convex portion or the thickness becomes thin in the concave portion. is thought to be the cause.

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

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

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

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

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

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

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

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

· Filter the coating agent to remove foreign matter.

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

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

In order to raise the surface sliding property, the surface layer may contain the particle|grains. When particles are included, the lower limit of the content of the surface layer particles is preferably 0 ppm, more preferably 50 ppm, still more preferably 100 ppm. Moreover, Preferably the upper limit of surface layer particle content is 20000 ppm, More preferably, it is 10000 ppm, More preferably, it is 8000 ppm, Especially preferably, it is 6000 ppm. When the above is exceeded, the roughness of the surface layer may not be able to be made into a preferable range.

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

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

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

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

When the roughness of the surface layer of the oriented film for transcription is high, you may provide a flattening coat. Examples of the resin used for the flattening coating include those generally used as resins for coating agents, such as polyester, acrylic, polyurethane, polystyrene, and polyamide. It is also preferable to use crosslinking agents, such as a melamine, isocyanate, an epoxy resin, and an oxazoline compound. These are coated and dried as a coating agent dissolved or dispersed in an organic solvent or water. Alternatively, in the case of acrylic, it may be coated with a solvent-free solvent and cured by radiation. The flattening coat may be an oligomer block coat. When the release layer is provided as a coat, the release layer itself may be thickened.

The lower limit of the thickness of the surface planarization coating layer is preferably 0.01 µm, more preferably 0.1 µm, still more preferably 0.2 µm, and particularly preferably 0.3 µm. If it is less than the above, the effect of planarization may become insufficient. Moreover, the upper limit of the thickness of the surface planarization coating layer becomes like this. Preferably it is 10 micrometers, More preferably, it is 7 micrometers, More preferably, it is 5 micrometers, Especially preferably, it is 3 micrometers. Even if it exceeds the above, further flattening effect may not be acquired.

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

(Roughness on the back side)

In addition, even if the release surface of the oriented film for transfer of the present invention is smoothed, a defect may occur in the liquid crystal compound oriented layer. This is because the oriented film for transfer is wound in a roll shape, and the surface and the back surface are in contact, It turned out that this is because the roughness of the back surface is transferred to the surface (the convex part of the back surface is transferred to the release layer, and a recessed part is formed). In order to protect the liquid crystal compound aligning layer, in order to protect the liquid crystal compound aligning layer, the oriented film for transcription may be wound up by bonding a masking film, but for cost reduction, it is wound up as it is in many cases. In the case of winding in a state in which the alignment layer is provided in this way, it is considered that the alignment layer is dented or punctured by the convex portion on the back surface, or a phenomenon such as the alignment of the alignment layer is disturbed. Moreover, after providing a liquid-crystal compound orientation layer, it is thought that the phenomenon that a hole is made in a liquid-crystal compound orientation layer or an orientation is disturbed is occurring by the convex part on the back surface. In particular, in the core part (卷芯部), the pressure is high and this phenomenon is easy to occur. From the above knowledge, it turned out that the said fault can be prevented by making the surface (back surface) of the opposite surface of a mold release surface into a specific roughness.

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

The lower limit of the three-dimensional ten-point average roughness (SRz) of the back surface of the oriented film for transfer of the present invention is preferably 7 nm, more preferably 10 nm, still more preferably 15 nm, particularly preferably 20 nm, most preferably For example, it is 25 nm. Moreover, the upper limit of SRz of the back surface of the oriented film for transcription|transfer of this invention becomes like this. Preferably it is 1500 nm, More preferably, it is 1200 nm, More preferably, it is 1000 nm, Especially preferably, it is 700 nm, Most preferably, it is 500 nm. When the above is exceeded, a fault may increase.

The lower limit of the maximum height of the back surface of the oriented film for transfer of the present invention (SRy: maximum peak height SRp+, maximum valley depth SRv) of the present invention is preferably 15 nm, more preferably 20 nm, still more preferably 25 nm, particularly Preferably it is 30 nm, Most preferably, it is 40 nm. In addition, the upper limit of the maximum height SRy of the back surface of the oriented film for transfer of the present invention is preferably 2000 nm, more preferably 1500 nm, still more preferably 1200 nm, particularly preferably 1000 nm, and most preferably 700 nm. to be. When the above is exceeded, a fault may increase.

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

When the roughness of the back surface of the oriented film for transfer of the present invention is less than the above range, the film slipperiness deteriorates, and the film becomes less slippery at the time of conveyance to a roll, winding, etc., and may be easily damaged. Moreover, when the roughness of the back surface of the oriented film for transcription|transfer of this invention exceeds the above, it will become easy to produce the above-mentioned fault.

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

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

- A film containing particles is used for the intermediate layer of the original film, and the thickness is reduced by not containing particles on the back side layer side (back side layer).

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

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

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

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

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

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

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

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

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

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

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

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

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

(Manufacturing method of oriented film for transfer)

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

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

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

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

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

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

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

In the annealing treatment, methods such as adjusting the relaxation rate by the circumferential speed difference between the unwinding speed and the winding speed or adjusting the winding tension to adjust the relaxation rate are employed. The lower limit of the relaxation rate is preferably 0.5%. If it is less than the above, the annealing effect may not be obtained. The upper limit of the relaxation rate is preferably 8%, more preferably 6%, still more preferably 5%. When it exceeds the above, planarity may fall or winding defect may arise.

(Laminate for liquid crystal compound alignment layer transfer)

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

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

(Orientation Control Layer)

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

(Rubbing treatment orientation control layer)

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

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

As a solvent for the rubbing treatment orientation control layer coating liquid, any solvent that dissolves a polymer material can be used without any limitation. Specific examples include alcohols such as water, methanol, ethanol, ethylene glycol, isopropyl alcohol, propylene glycol and cellosolve; ester solvents such as ethyl acetate, butyl acetate, and gamma butyrolactone; ketone solvents such as acetone, methyl ethyl ketone, cyclopentanone, and cyclohexanone; aromatic hydrocarbon solvents such as toluene or xylene; Ether solvents, such as tetrahydrofuran or dimethoxyethane, etc. are mentioned. These solvents may be used independently and may be combined.

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

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

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

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

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

(optical orientation control layer)

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

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

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

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

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

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

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

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

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

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

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

(Liquid crystal compound alignment layer)

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

(polarizing film)

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

(dichroic pigment)

A dichroic dye means a dye which has the property from which the absorbance in the long-axis direction of a molecule|numerator differs from the absorbance in a short-axis direction.

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

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

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

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

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

(Polymerizable liquid crystal compound)

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

A polymerizable group means group which participates in a polymerization reaction, and it is preferable that it is a photopolymerizable group. Here, the photopolymerizable group refers to a group capable of polymerization reaction with an active radical, acid, or the like generated from a photopolymerization initiator described later. Examples of the polymerizable group include a vinyl group, a vinyloxy group, a 1-chlorovinyl group, an isopropenyl group, a 4-vinylphenyl group, an acryloyloxy group, a methacryloyloxy group, an oxiranyl group, and an oxetanyl group. . Among them, an acryloyloxy group, a methacryloyloxy group, a vinyloxy group, an oxiranyl group and an oxetanyl group are preferable, and an acryloyloxy group is more preferable. The compound exhibiting liquid crystallinity may be a thermotropic liquid crystal or a lyotropic liquid crystal, and may be a nematic liquid crystal or a smectic liquid crystal in the thermotropic liquid crystal.

The polymerizable liquid crystal compound is preferably a smectic liquid crystal compound, and more preferably a higher order smectic liquid crystal compound, since higher polarization properties can be obtained. If the liquid crystal phase formed by the polymerizable liquid crystal compound is a higher-order smectic phase, a polarizing film having a higher degree of alignment order can be produced.

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

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

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

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

Although limitation will not be carried out as long as a polymerization initiator polymerizes a polymerizable liquid crystal compound, A photoinitiator which generate|occur|produces an active radical with light is preferable. As a polymerization initiator, a benzoin compound, a benzophenone compound, an alkylphenone compound, an acylphosphine oxide compound, a triazine compound, an iodonium salt, a sulfonium salt etc. are mentioned, for example.

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

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

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

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

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

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

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

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

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

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

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

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

(retardation layer)

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

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

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

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

As a specific compound,

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

In the case of using a high retardation film, for the purpose of preventing blackout or coloring when viewing an image while wearing polarized sunglasses, the angle between the transmission axis of the polarizer and the slow axis of the high retardation film is preferably in the range of 30 to 60 degrees, Furthermore, the range of 35-55 degree|times is preferable. In order to reduce rainbow spots and the like 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 set to 10 degrees or less, and further to 7 degrees or less, or 80 It is preferable to set it as -100 degree|times, furthermore, 83-97 degree|times.

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

(Composite retardation layer)

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

In this case, it is preferable to arrange the λ/4 layer and the λ/layer at the same angle as the sum of the λ/4 layers. Specifically, the angle (θ) between the orientation axis (slow axis) of the λ/2 layer and the transmission axis of the polarizer is preferably 5 to 20 degrees, more preferably 7 to 17 degrees. The angle between the orientation axis (slow axis) of the λ/2 layer and the orientation axis (slow axis) of the λ/4 layer is preferably in the range of 2θ+45°±10°, more preferably in the range of 2θ+45°±5°, further Preferably, it is in the range of 2θ+45°±3°.

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

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

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

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

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

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

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

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

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

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

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

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

The inspection method of the liquid crystal compound alignment layer transfer laminate of the present invention is parallel to the alignment direction of the alignment film, or in a direction perpendicular to the alignment direction, or in the flow direction of the alignment film, or in a direction orthogonal to the flow direction. It includes a step of irradiating linearly polarized light having an electric field vibration direction from the alignment film surface of the laminate, receiving light from the liquid crystal compound alignment layer surface side, and a step of inspecting whether the received light has a quenched state. Thus, in this invention, even if the liquid crystal compound orientation layer is a retardation layer, the laminated body for liquid crystal compound orientation layer transfer can test|inspect the optical characteristic in the state laminated|stacked on the orientation film for transcription|transfer.

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

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

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

(Inspection of polarization layer)

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

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

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

Example

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

(1) The angle difference between the orientation direction of the orientation film for transcription|transfer, the direction orthogonal to the flow direction or flow direction of an orientation film, and the orientation angle in the width direction of a film

First, the film was taken out from the roll, and the orientation directions were determined at five places at both ends (a point 5 cm inward from each end), the central part, and the middle part midway between the central part and both ends. The middle part which is in the middle of a center part and both ends exists in the position which divided the space|interval of the center part and both ends into two. In addition, the orientation direction was made into the slow-axis direction of the film calculated|required using the molecular orientation meter (The Oji Keisoku Instruments Co., Ltd. make, MOA-6004 type molecular orientation meter). Next, it was investigated whether the whole orientation direction of a film is close to a flow direction (MD), or whether it is close to a width direction (TD). And, when the orientation direction of the whole film is close to the flow direction, in each of the above five places, the angle between the orientation direction and the flow direction of the film is obtained, and the value at the location serving as the largest angle is "oriented film" The angle between the orientation direction of , and the flow direction of the orientation film" was adopted as the maximum value. On the other hand, when the orientation direction of the entire film is close to the width direction, the angle between the orientation direction and the direction orthogonal to the flow direction of the film is obtained in each of the above five places, and the value at the location which becomes the largest angle was adopted as the maximum value of "the angle between the orientation direction of an orientation film and the direction orthogonal to the flow direction of an orientation film."

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

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

(2) Refractive index of oriented film for transfer

A rectangle of 4 cm x 2 cm was cut out so that the slow axis direction calculated|required in said (1) might become parallel with the long side, and it was set as the sample for a measurement. For this sample, the refractive index of the biaxial orthogonal axis (refractive index in the slow axis direction: nx, the refractive index in the fast axis direction (direction orthogonal to the slow axis direction): ny) and the refractive index in the thickness direction (nz) were measured using an Abbe refractometer (Ata). It calculated|required by the Kosa company make, NAR-4T, measurement wavelength 589 nm).

(3) Thermal contraction rate for 30 minutes at 150°C in the MD direction of the oriented film for transfer, the TD direction, the direction of 45 degrees with respect to the MD direction, or the direction of 135 degrees with respect to the MD direction

It measured based on JIS C 2318-1997 5.3.4 (dimensional change). Specifically, in the direction to be measured (MD direction, TD direction, a direction of 45 degrees with respect to the MD direction, a direction of 135 degrees with respect to the MD direction), the film is cut to a width of 10 mm and a length of 250 mm, and the sample is placed at 200 mm intervals. Two marks were made, and the gap (A) between the two marks was measured under a constant tension of 5 gf. Next, the film was placed in an oven in an atmosphere of 150° C., and after heat treatment at 150±3° C. under no load for 30 minutes, the gap (B) between the two marks was measured under a constant tension of 5 gf. The thermal contraction rate was calculated|required from the following formula|equation.

Thermal shrinkage (%) = (A-B)/A×100

(4) 95℃ maximum heat shrinkage

The oriented film for transcription cut out from each cutout of the slit roll was cut out in the square shape of 21 cm on one side, and it was left to stand in 23 degreeC and 65 %RH atmosphere for 2 hours or more. A circle having a diameter of 80 mm centering on the center of this film was drawn, and the diameter was measured at intervals of 1 degree using a two-dimensional image measuring instrument (QUICK IMAGE manufactured by MITUTOYO) with the flow direction of the film being 0 degree. Here, the film flow direction was set to 0 degrees, and the clockwise direction (right rotation) was set as a positive angle, and the counterclockwise direction (left rotation) was set as a negative angle in the film upper surface. Since the diameter was measured, it was measured with respect to the whole direction with the measurement in the range of -90 degree to 89 degree|times. Next, after heat-processing this film at 95 degreeC for 30 minute(s) in hot water, it left to stand in 23 degreeC, 65 %RH atmosphere for 2 hours or more. Then, similarly to the above, the diameter of the circle was measured at intervals of 1 degree. The diameter before heat treatment was Lo, the diameter in the same direction after heat treatment was L, and according to the following formula, the thermal contraction rate in each direction was obtained, and the maximum value among the thermal contraction rates in all directions was taken as the maximum thermal contraction rate. Moreover, the angle (the direction with which a value becomes small) was calculated|required with the direction which has a maximum thermal contraction rate, and MD or TD.

Thermal contraction rate (%) = ((L ₀ -L)/L ₀ )×100

(5) Elastic modulus: It was measured based on JIS C-2318. The sample was cut out from the center of the width direction of the slit roll obtained by slitting from the center part.

(6) Light transmittance at a wavelength of 380 nm

Using a spectrophotometer (manufactured by Hitachi Seisakusho, U-3500 type), the light transmittance in a wavelength range of 300 to 500 nm of the oriented film for transfer was measured using an air layer as a standard, and the light transmittance at a wavelength of 380 nm was determined.

(7) intrinsic viscosity

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

(8) light leakage

A sample laminate in which a lower polarizing plate is placed on a surface-emitting light source using a white LED using a yellow phosphor as a light source, and a retardation layer (liquid crystal compound alignment layer) is provided on an alignment film for transfer thereon, in the extinction axis direction of the polarizing plate (Absorption axis direction) was set so that it might become parallel with the long side direction of a sample laminated body. Furthermore, a λ/4 film made of a stretched film of cyclic polyolefin is placed thereon so that the orientation main axis is at a 45 degree angle to the extinction axis of the lower polarizing plate, and an upper polarizing plate is placed thereon, and an upper polarizing plate has an extinction axis of the lower polarizing plate. It was placed parallel to the optical axis. In this state, the extinction state was observed. Specifically, the following reference|standard evaluated the extinction state of the brightest part among a sample laminated body. In addition, the extinction state which made the lower polarizing plate and the upper polarizing plate into the state of cross nicol except the sample laminate and (lambda)/4 film was made into the extinction state.

(double-circle): There was no place that felt bright, and the whole was in a state of extinction.

(circle): The transmitted light was recognized slightly rather than the extinction state.

(triangle|delta): Although transmitted light was recognized, it was possible to evaluate the phase difference state.

x: There was much transmitted light, and it was difficult to evaluate the phase difference state.

(9) Brightness uniformity

In the same state as (8) above, the uniformity of the quenched state in the sample laminate was evaluated on the basis of the following criteria. In addition, the extinction state which made the lower polarizing plate and the upper polarizing plate into the state of cross nicol except the sample laminated body and (lambda)/4 film was made into the extinction state.

(double-circle): It was almost the same brightness in the whole sample laminated body.

○: There was a slight difference in brightness.

(triangle|delta): There was a small difference in brightness.

x: The difference in brightness was large.

(10) Displacement of heating orientation of retardation layer

The sample laminate was heat-treated in an oven at 120° C. for 20 minutes, and a commercially available adhesive sheet for optics was bonded to the retardation layer side of the sample laminate cooled to room temperature, and the adhesive sheet was further affixed to the glass plate, and then the orientation film was It peeled and the phase difference layer was transcribe|transferred on the glass plate. In the state which laminated|stacked the retardation layer on the glass plate, the glass plate/retardation layer laminated body was arrange|positioned between the polarizing plates arrange|positioned by cross nicol, and the direction to quench was calculated|required. The angle difference between the direction to quench and the long side direction of the orientation film was calculated|required, the difference of this angle difference and 45 degree|times was made into a heating orientation direction shift|offset|difference, the average value of the value performed 5 times was computed, and the following reference|standard evaluated.

(double-circle): It was less than 1 degree.

(circle): It was more than 1 degree|times, and it was 2 degrees or less.

(triangle|delta): It was more than 2 degrees and 3 degrees or less.

x: It exceeded 3 degree|times.

(11) Content of ester cyclic trimer

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

(Measuring conditions)

Apparatus: L-7000 (manufactured by Hitachi Seisakusho)

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

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

Eluent B: acetonitrile

Gradient B%: 10→100% (0→55 min)

Flow rate: 0.8ml/min

Temperature: 30℃

Detector: UV-258nm

(12) Amount of precipitation of ester cyclic trimer on the surface of the release surface of the film

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

(Measuring conditions)

Device: ACQUITY UPLC (manufactured by Waters)

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

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

Eluent B: acetonitrile

Slope B%: 10→98→98% (0→25→30 minutes)

Flow rate: 0.2ml/min

Column temperature: 40°C

Detector: UV-258nm

(13) Evaluation of haze increase (Δhaze) before and after heat treatment

The film was cut into a 50 mm × 75 mm square, and in accordance with JIS K 7105 "Test method for optical properties of plastics" haze (dipping), the initial haze before heat treatment (haze before heating) was measured. . The NDH-300A type turbidimeter manufactured by Nippon Denshoku Kogyo Co., Ltd. was used for the measuring instrument. In order to measure the haze after heating, a protective film (PC-T073 manufactured by Fujimori Kogyo Co., Ltd.) is adhered to the side (back side) of the sample film piece on the non-haze-evaluated side before heat treatment using a roller so that air bubbles do not enter it. The film is set in the oven heated to 150 degreeC in the state which affixed the protective film, and a film is taken out after 90 minutes pass. After that, a protective film is peeled, a haze is measured for a film by the method similar to the above, and a haze is obtained after a heating. Let the haze difference before and behind this heating be (DELTA) haze.

ΔHaze (%) = (Haze after heating) - (Haze before heating)

(14) Surface resistivity of polyester film (Ω/sq)

Based on JISK6911, the surface resistivity value (Ω) was measured by the applied voltage 500V in 23 degreeC and an atmosphere of 40 %RH using the surface resistivity measuring device (made by Takeda Riken Co., Ltd.).

(15) High-speed coating titration

The solution for forming a retardation layer was applied and dried with a gravure coater on the uncoated surface of the transfer oriented film or the oligomer block coated surface. Then, the state of the film|membrane quality in winding-core vicinity (450 m vicinity from the start) of the oriented film for transcription|transfer was observed, and the following reference|standard evaluated.

(circle): It was a uniform coating film.

x: Seeing thought to be due to static electricity was recognized.

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

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

(17) The number of projections of 0.5 µm or more (release surface), 2.0 µm (rear surface) or more

A test piece having a width of 100 mm and a length of 100 mm was cut out in the longitudinal direction of the film, sandwiched between two polarizing plates to form a cross nicol state, and set in a state where the extinction position was maintained. In this state, using a Nikon universal projector V-12 (measurement conditions: projection lens 50x, transmitted illumination luminous flux conversion knob 50x, transmitted light inspection), the long axis of the part (scratches, foreign matter) through which light is transmitted and appears dazzling (scratches, foreign objects) length) of 50 µm or more was detected. The portion thus detected was cut out from the test piece to an appropriate size, and the film plane was measured using a three-dimensional shape measuring device (manufactured by Ryoka Systems, Micromap TYPE550; measurement conditions: wavelength 550 nm, WAVE mode, objective lens 10x). It observed and measured from the vertical direction. At this time, it is assumed that the irregularities approaching within 50 μm when observed from the direction perpendicular to the film plane are the same flaws and foreign substances, and a rectangle covering them is assumed, and the length and width of the rectangles are the length and width of the flaws and foreign substances. Regarding this flaw and foreign material, the number of defects was quantified using a cross-sectional image (SURFACE PROFILE DISPLAY). In addition, the measurement was performed with respect to the test piece of 20 sheets, and it converted into the number of faults per 1 m<2>. The number of defects of those having a height difference (difference between the highest and lowest) of 0.5 µm or more was counted on the mold release side, and the number of defects of 2.0 µm or more of height difference on the back side was counted.

<Production of polyester resin for oriented film for transfer>

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

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

After completion of the polycondensation reaction, filtration is performed with a 95% Naslon filter having a cut diameter of 5 µm, extruded from a nozzle into a strand shape, and cooled and solidified using cooling water previously subjected to filtration (pore diameter: 1 µm or less). and cut into pellets to obtain polyethylene terephthalate resin (PET (Xm)). PET (X-m) had an intrinsic viscosity of 0.62 dl/g, and contained substantially no inert particles and internally precipitated particles.

(Preparation of polyester resin (PET (Y))

10 parts by mass of a dried ultraviolet absorber (2,2'-(1,4-phenylene)bis(4H-3,1-benzooxazin-4-one) and PET(Xm) (intrinsic viscosity of 0.62dl/ g) 90 parts by mass were mixed, and a polyethylene terephthalate resin (PET(Y)) containing an ultraviolet absorber was obtained using a kneading extruder.

(Production of low oligomer content polyester (X-s))

The polyester resin (PET(Xm)) was dried at 160°C under reduced pressure, and then nitrogen gas with a moisture content of 15.3 g/Nm3 was prepared at 300 liters per hour per 1 kg of polyester. It flowed and heat-processed at 230 degreeC for 12 hours. The intrinsic viscosity of the obtained polyester was 0.617 dl/g, and content of the cyclic trimer was 0.29 mass %.

<Production of easily adhesive layer component>

(Production of polyurethane resin D-1)

Polyurethane resin D-1 having an aliphatic polycarbonate polyol as a constituent component was produced in the following procedure. 43.75 parts by mass of 4,4-diphenylmethane diisocyanate, 12.85 parts by mass of dimethylol butanoic acid, number average to a four-neck flask equipped with a stirrer, a Dimroth condenser, a nitrogen inlet tube, a silica gel drying tube, and a thermometer 153.41 parts by mass of polyhexamethylene carbonate diol having a molecular weight of 2000, 0.03 parts by mass of dibutyltin dilaurate, and 84.00 parts by mass of acetone as a solvent were added, and stirred under a nitrogen atmosphere at 75° C. for 3 hours to obtain a reaction solution of a predetermined amine It was confirmed that the equivalent weight was reached. Next, after temperature-falling this reaction liquid to 40 degreeC, 8.77 mass parts of triethylamines were added and the polyurethane prepolymer solution was obtained. Next, in a reaction vessel equipped with a homodisper capable of high-speed stirring, 450 g of water was added, adjusted to 25°C, and stirred and mixed at 2000 min-1, a polyurethane prepolymer solution was added and dispersed in water. Then, the water-soluble polyurethane resin (D-1) with a solid content concentration of 35 mass % was prepared by removing a part of acetone and water under reduced pressure. The glass transition point temperature of the obtained polyurethane resin (D-1) was -30 degreeC.

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

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

(Preparation of coating liquid for easily adhesive layer)

The following coating agent was mixed and the coating liquid for easily bonding layers was created.

water 55.62 mass%

isopropanol 30.00 mass%

Polyurethane resin (D-1) 11.29 mass%

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

particle 0.71 mass%

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

particle 0.07 mass% (Silica sol with an average particle diameter of 450 nm, solid content concentration of 40 mass%) Surfactants 0.05 mass% (Silicone-based, solid content concentration 100% by mass) (solid content concentration 10% by mass)

(Preparation of oriented film roll 1 for transfer)

As a raw material for the intermediate layer of the oriented film for transfer, 90 parts by mass of PET (Xm) resin pellets and 10 parts by mass of PET (Y) resin pellets containing an ultraviolet absorber were dried under reduced pressure (1 Torr) at 135° C. for 6 hours, followed by extruder 2 ( intermediate layer (for layer II). Further, as a raw material for the outer layer of the oriented film for transfer, PET (X-m) was dried by a conventional method, fed to extruder 1 (for outer layer (layer I, layer III)), and melted at 285°C. These two types of polymers are each filtered through a stainless steel sintered filter medium (nominal filtration precision of 10 µm particle 95% cut), laminated with 2 types and 3 layer merging blocks, and extruded from a nozzle into a sheet shape. After that, it was wound around a casting drum having a surface temperature of 30°C using an electrostatic application casting method to solidify by cooling, thereby making an unstretched film. At this time, the discharge amount of each extruder was adjusted so that ratio of the thickness of the I-layer, II-layer, and III-layer might be set to 10:80:10.

Next, by the reverse roll method, the coating liquid for easy adhesion was applied to one side of the unstretched PET film so that the application amount after drying was 0.08 g/m 2 , and then guided to a dryer and dried at 80° C. for 20 seconds.

The unstretched film in which this application layer was formed was guided to a tenter stretching machine, and the film was guided to a hot air zone at a temperature of 125°C while gripping the edge of the film with a clip, and stretched 4.0 times in the width direction. Next, maintaining the width|variety extended|stretched in the width direction, the temperature 210 degreeC and the heat setting process for 10 second were performed, and also 3.0% of relaxation processing was performed. Then, the both ends of the cooled film were cut|disconnected, and it wound up with the tension|tensile_strength of 0.4 kg/mm<2>, and obtained the uniaxially-oriented PET film (1,800 cm in width, the orientation film 1 for transcription|transfer) with a film thickness of 50 micrometers.

The central part of the obtained film was slitted to 50 cm width, and it was set as the film roll (slit film 1-c) of about 500 m in length.

The right 50cm width was slitted from the center part of the obtained film, and it was set as the film roll (1-r1) of about 500m in length.

The right edge 50 cm width of the obtained film was slitted, and it was set as the film roll (1-r2) of about 500 m in length.

(Preparation of oriented film roll 2 for transfer)

The unstretched film produced by the same method as the transfer oriented film 1 (the coating of the easily adhesive layer has been completed) is heated to 105° C. using a heated roll group and an infrared heater, and then 3.3 in the running direction with a roll group with a circumferential speed difference. After double stretching, it was guided to a hot air zone at a temperature of 135 ° C., stretched 3.5 times in the width direction, and the heat setting temperature was 225 ° C. In the same manner as in the oriented film 1 for transfer, the transfer oriented film 2 was got it

The central part of the obtained film was slitted to 50 cm width, and it was set as the film roll 2-c of about 500 m in length.

The right 50 cm width was slitted from the center part of the obtained film, and it was set as the film roll (2-r1) of about 500 m in length.

The central part 50 cm width of the right half of the obtained film was slitted, and it was set as the film roll (2-r2) of about 500 m in length.

The right edge 50 cm width of the obtained film was slitted, and it was set as the film roll (2-r3) of about 500 m in length.

(Preparation of oriented film roll 3-c for transfer)

Film roll 1-c was unwound, passed through 130 degreeC heating oven, it wound up, annealed, and the oriented film roll 3-c for transcription|transfer was obtained. The passage time of the oven was set to 20 seconds.

(Preparation of oriented film roll 4-c for transfer)

Except having changed the relaxation treatment conditions as shown in Table 1, it carried out similarly to the oriented film 1 for transcription|transfer, and obtained the oriented film roll 4-c for transcription|transfer. The central part was slit.

(Preparation of oriented film roll 5-c for transfer)

Except having changed the heat setting temperature as shown in Table 1, it carried out similarly to the orientation film 1 for transcription|transfer, and obtained the orientation film roll 5-c for transcription|transfer. The central part was slit.

(Preparation of oriented film roll 6-c for transfer)

Except having changed the draw ratio of the width direction as shown in Table 1, it carried out similarly to the orientation film 1 for transcription|transfer, and obtained the orientation film roll 6-c for transcription|transfer. The central part was slit.

(Preparation of oriented film roll 7-c for transfer)

The oriented film roll 6-c for transcription|transfer was annealed, and the oriented film roll 7-c for transcription|transfer was obtained.

(Preparation of oriented film roll 8-c for transfer)

The unstretched film produced by the same method as the transfer oriented film 1 (the easily adhesive layer coated) was heated to 105° C. using a heated roll group and an infrared heater, and then 2.0 in the running direction with a roll group with a circumferential speed difference. After extending|stretching twice, it guide|induced to the hot air zone with a temperature of 135 degreeC, it extended|stretched 4.0 times in the width direction, and obtained the oriented film roll 8-c for transcription|transfer by the method similar to the oriented film 1 for transcription|transfer. The central part was slit.

(Preparation of oriented film roll 9-c for transfer)

The heat setting temperature was 170 degreeC, and it carried out similarly to the oriented film 1 for transcription|transfer, and obtained the oriented film roll 9-c for transcription|transfer, except having wound up with the tension|tensile_strength of 0.6 kg/m<2> without performing a relaxation|relaxation process. The central part was slit.

(Preparation of oriented film roll 10-c for transfer)

An unstretched film produced by the same method as the transfer oriented film 1 (with an easy-adhesive layer coated) is heated to 105° C. using a heated roll group and an infrared heater, and then 4.0 in the running direction with a roll group with a circumferential speed difference After double-stretching, it processed for the temperature of 225 degreeC and 10 second within a dryer, 3.0% of relaxation processing was performed using the circumferential speed difference, and the oriented film roll 10-c for transcription|transfer was obtained. The central part was slit.

In addition, in the said transfer orientation film rolls 1-10-c, the surface to which the easily adhesive layer was not coated (non- easily adhesive coating layer surface) was used as a mold release surface.

(Preparation of oriented film roll 11-c for transfer)

The non-peelable coating surface of the oriented film roll 1 (1-c) for transfer was corona-treated, the following oligomer block coating agent was applied, and dried in a heating oven at 150° C. for 3 minutes to prepare the transfer oriented film roll 11-c. got it The thickness of the coating layer was 150 nm.

-Melamine crosslinked alkyl-modified alkyd resin (manufactured by Hitachi Kasei Polymers: Tespine 322: solid content 40%) 2.5 copies

・P-toluenesulfonic acid (manufactured by Hitachi Kasei Polymers: Dryer 900) 0.025 parts

·toluene 50 copies

·Methyl ethyl ketone Part 47.2

In addition, the oligomer block coating layer surface was used as a release surface.

(Preparation of oriented film roll 12-c for transfer)

Use the following coating agent (oligomer block coating agent) instead of the coating liquid for easy-adhesive layer on one side, and use the following coating agent for the other side that does not contain silica particles. A use orientation film roll 12-c was obtained. The central part was slit.

· Hexamethoxymethylolmelamine 52% by mass

・Epocross (manufactured by Nippon Shokubai, Ltd.). Oxazoline content 7.7mmol/g 30% by mass

· Polyglycerol polyglycidyl ether 10% by mass

·2-Amino-2-methylpropanol hydrochloride 3% by mass

Silica particles (average particle diameter 0.07 μm) 5% by mass

(Solvent: Toluene/MEK = 1/1)

Further, the surface of the oligomer block coating layer not containing silica particles was used as the release surface.

(Preparation of oriented film roll 13-c for transfer)

Except having used PET(X-s) instead of PET(X-m), it carried out similarly to the oriented film roll 11-c for transcription|transfer, and obtained the oriented film roll 13-c for transcription|transfer. The central part was slit.

In addition, the oligomer block coating layer surface was used as a release surface.

(Preparation of oriented film roll 14-c for transfer)

Except having used the following coating agent as a coating liquid for easily bonding layers, it carried out similarly to the orientation film 1 for transcription|transfer, and obtained the orientation film roll 14-c for transcription|transfer which has antistatic ability.

water 16.70% by mass

isopropanol 21.69 mass%

sorbitol 5.00 mass%

Thiophene resin 51.02 mass% (Bytron P AG manufactured by talc, 1.2 mass% of solid content)

Polyurethane resin (D-1) 3.81 mass%

Aqueous solution of oxazoline-based crosslinking agent (E-1) 1.22 mass%

particle 0.70 mass% (Silica sol with an average particle diameter of 40 nm, solid content concentration of 40 mass%)

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

Surfactants 0.05 mass%

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

(solid content concentration 10% by mass)

In addition, the non-releasable coating layer surface was used as a release surface.

(Preparation of oriented film roll 15-c for transfer)

On the easily-adhesive coating surface of the orientation film roll 1 (1-c) for transcription|transfer, what made Feltron C-4402 (antimony-doped tin oxide particle|grains) 5% of solid content concentration with MEK was apply|coated, and 80 degreeC 3 minutes in heating oven. After drying, an antistatic coating layer having a thickness of 100 nm was provided. On the other hand, an oligomer block coating layer was provided on the non- easily adhesive coated surface in the same manner as in the oriented film 11-c for transfer, and an oriented film roll 15-c for transfer having an antistatic property was obtained.

In addition, the oligomer block coating layer surface was used as a release surface.

In Table 1, each manufacturing condition and characteristic of the said oriented film roll for transcription|transfer is shown.

[Table 1]

Experimental Example 1A

(Formation of rubbing treatment orientation control layer)

The orientation film roll 1-c for transfer is unwound, cut to a length of 30 cm, and a coating material for a rubbing treatment orientation control layer of the following composition is applied to the non- easily adhesive coated surface using a bar coater, dried at 80° C. for 5 minutes, and has a thickness of 200 nm formed the barrier of Then, the surface of the obtained film|membrane was processed with the rubbing roll wound with nylon raised cloth, and the orientation film for transcription|transfer which laminated|stacked the rubbing process orientation control layer was obtained. Rubbing was performed so that it might become 45 degrees with respect to the short side of the cut rectangle.

Completely saponified polyvinyl alcohol (weight average molecular weight 800) 2 parts by mass

Ion exchanged water 100 parts by mass

Surfactants 0.5 parts by mass

Then, the solution for phase difference layer (liquid crystal compound orientation layer) formation of the following composition was apply|coated by the bar-coating method to the surface which performed the rubbing process. Drying at 110° C. for 3 minutes, irradiating UV light to cure, and forming a λ/4 layer as a retardation layer (liquid crystal compound alignment layer) on the alignment film 1-c for transfer, liquid crystal compound alignment layer transfer laminate was manufactured

Rod-like liquid crystal compound (LC242 manufactured by BASF) 75 parts by mass

compound 20 parts by mass

trimethylolpropane triacrylate 5 parts by mass

Irgacure 379 3 parts by mass

Surfactants 0.1 parts by mass

methyl ethyl ketone 250 parts by mass

Experimental Examples 2A, 3A, 6A-21A, Experimental Example 2B

Except having changed the kind of orientation film for transcription|transfer as shown in Table 2, it carried out similarly to Experimental Example 1A, and Experimental example 2A, 3A, 6A-21A, The laminated body for liquid crystal compound orientation layer transcription|transfer of Experimental example 2B was manufactured.

Experimental Examples 4A, 5A, Experimental Example 1B

The transfer orientation film roll 1-r2 is cut to a length of about 30 cm, and from the cut film, the angle between the orientation axis of the film and the direction of the long side is 6 degrees, 9 degrees, and 15 degrees, so as to form a rectangle with as large an area as possible. was adjusted Except having used this film, it carried out similarly to Experimental example 3A, and manufactured the laminated body for liquid crystal compound orientation layer transcription|transfer of Experimental example 4A, 5A, and Experimental example 1B.

Table 2 shows the evaluation results of the liquid crystal compound alignment layer transfer laminates of Experimental Examples 1A to 21A, 1B, and 2B. In addition, the numerical value of the item of "Angle of MD or TD and orientation direction (degree of maximum position)" of Experimental Examples 4A, 5A, and Experimental Example 1B in Table 2 represents the angle between the long side of the rectangular sample and the orientation axis. .

[Table 2]

As is apparent from Table 2, in all of Experimental Examples 1A to 21A satisfying the requirements of the first invention, light leakage was ?, ?, or ?, and a retardation layer (liquid crystal compound alignment layer) was laminated on the alignment film. It is possible to evaluate the phase difference state, and the brightness uniformity is excellent. In contrast, in Experimental Example 1B and Experimental Example 2B in which the angle between the orientation direction of the orientation film and the direction orthogonal to the flow direction or flow direction of the orientation film is too large, light leakage is ×, and the retardation layer (liquid crystal compound It was difficult to evaluate the phase difference state in the state which laminated|stacked the orientation layer) on the orientation film.

Further, as is apparent from Table 2, in all of Experimental Examples 1A to 3A, 6A to 14A, and 16A to 21A satisfying the requirements of the second invention, the orientation angle shift of the retardation layer was ?, ?, or ?. On the other hand, in Experimental Example 15A with too large the difference of 150 degreeC thermal contraction rate between the flow direction (MD direction) of an oriented film, and the direction orthogonal to a flow direction (TD direction), the orientation angle shift of the retardation layer was x. In the case of Experimental Example 15A, when additional heat is applied in the following process, etc., or when the temperature when installing the retardation layer is increased, the orientation direction of the retardation layer is shifted. There is a risk that there will be no

Table 3 shows the effect of the oligomer block coat and the antistatic layer of the liquid crystal compound alignment layer transfer laminate of Experimental Examples 17A to 21A compared with Experimental Example 1A.

[Table 3]

As is apparent from Table 3, in all of Experimental Examples 17A to 19A satisfying the requirements of the third invention, Δ haze (increase in haze before and after heat treatment) was small, and the increase in haze due to heat treatment was sufficiently suppressed. In particular, in Experimental Example 19A using a low oligomer content polyester as the polyester resin constituting the orientation film, the surface layer oligomer content was small, and therefore the surface oligomer precipitation amount was also small. As a result, the Δ haze was more significant than in other examples. very small, and the increase in haze due to heat treatment was extremely sufficiently suppressed. In contrast, in Experimental Example 1A with a large surface oligomer precipitation amount, Δ haze was large, and the haze was greatly increased by heat treatment. Further, in Experimental Example 21A in which an antistatic coating layer was provided and in Experimental Example 20A in which an antistatic agent was added to the easily adhesive layer, the surface resistance of the film was sufficiently low compared to Experimental Example 1A in which the same was not performed, and antistatic properties This was excellent.

In Table 4, the surface roughness of the film of Experimental Example 1A is shown as a representative. In addition, evaluation of retardation layer WHEREIN: The fault of a pinhole shape or a flaw shape was not recognized.

[Table 4]

Experimental Example 22A

(Production of a circular polarizing plate as a specific example of a liquid crystal compound alignment layer laminated polarizing plate)

An unstretched film having a thickness of 100 µm is prepared using polyethylene terephthalate having an intrinsic viscosity of 0.63 as a thermoplastic resin substrate, and an aqueous solution of polyvinyl alcohol having a polymerization degree of 2400 and a saponification degree of 99.9 mol% is applied to one side of the unstretched film and It dried to form a PVA layer.

The obtained laminate was stretched twice in the longitudinal direction between rolls having different peripheral speeds at 120°C and wound up. Next, the resulting laminate was treated in 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 a mixed aqueous solution of boric acid (3%) for 30 seconds.

Further, this laminate was uniaxially stretched in the longitudinal direction in a mixed aqueous solution of boric acid (4%) and potassium iodide (5%) at 72°C, then washed with a 4% aqueous potassium iodide solution, and the aqueous solution was removed with an air knife. It dried in 80 degreeC oven later, both ends were slitted and wound up, and the base material laminated polarizer of width 30cm and length 1000m was obtained. The draw ratio of the total was 6.5 times, and the thickness of the polarizer was 5 micrometers. In addition, the thickness was read by embedding a base material laminated polarizer in an epoxy resin, cutting out a section, and observing with an optical microscope.

After bonding the polarizer side of the said base material laminated polarizer to an ultra-birefringent polyester film (Cosmo Shine (R) SRF thickness 80 micrometers made by Toyobo Co., Ltd.) using an ultraviolet curable adhesive, the base material of the base material laminated polarizer was peeled. Furthermore, the commercially available optical adhesive sheet was laminated|stacked on this polarizer surface. The release film of the pressure-sensitive adhesive sheet was peeled off, the liquid crystal compound alignment layer surface and the pressure-sensitive adhesive layer of the liquid crystal compound alignment layer transfer laminate of Experimental Example 1A were bonded together, and then the alignment film in the laminate of Experimental Example 1A was peeled off, A polarizing plate was obtained. The obtained circularly polarizing plate had a high antireflection function. In addition, the slow axis of the Cosmo Shine (R) SRF and the extinction axis of the polarizer were made to be perpendicular, and the MD direction of the Cosmo Shine (R) SRF and the MD direction of the orientation film in the laminate of Experimental Example 1A were made to be parallel.

Industrial Applicability

The alignment film for liquid crystal compound alignment layer transfer of the present invention can appropriately evaluate the alignment state of the liquid crystal compound alignment layer (retardation layer or polarizing layer) provided thereon in a state in which the liquid crystal compound alignment layer is laminated on the alignment film. . In addition, the alignment film for liquid crystal compound alignment layer transfer of the present invention can transfer the retardation layer and the polarizing layer in the orientation as designed, while using a stretched film such as polyester which is inexpensive and has excellent mechanical strength. The problem of leakage can be prevented. In addition, the alignment film for liquid crystal compound alignment layer transfer of the present invention can effectively prevent a rise in haze or generation of foreign matter during heat treatment of the film while using a stretched film such as polyester, which is inexpensive and has excellent mechanical strength. , a retardation layer or a polarizing layer (liquid crystal compound alignment layer) of orientation as designed can be formed. Therefore, according to this invention, retardation layer laminated polarizing plates, such as a circularly polarizing plate, can be manufactured stably with high quality.

Claims (18)

An alignment film for transferring a liquid crystal compound alignment layer to an object, wherein the angle between the alignment direction of the alignment film and the direction orthogonal to the flow direction or flow direction of the alignment film is each end in the width direction of the film An alignment film for liquid crystal compound alignment layer transfer, characterized in that it is 14 degrees or less from the maximum value measured at five locations at both ends, the center portion, and the middle portion in the middle of the center and both ends at a point 5 cm inward from the . The method of claim 1,
The alignment film for liquid crystal compound alignment layer transfer, characterized in that the angular difference of the alignment angle in the width direction of the alignment film is 7 degrees or less. 3. The method according to claim 1 or 2,
The alignment film for liquid crystal compound alignment layer transfer, characterized in that the alignment film is a polyester film. A laminate in which a liquid crystal compound alignment layer and an alignment film are laminated, wherein the alignment film is the alignment film according to any one of claims 1 to 3, characterized in that the liquid crystal compound alignment layer transfer laminate. A liquid crystal compound alignment layer laminated polarizing plate comprising a step of bonding a polarizing plate and a liquid crystal compound alignment layer surface of the laminate according to claim 4 to form an intermediate laminate, and a step of peeling an alignment film from the intermediate laminate. manufacturing method. A method of inspecting the alignment state of the liquid crystal compound alignment layer in the laminate according to claim 4, in the alignment direction of the alignment film, or in a direction orthogonal to the alignment direction, or in the flow direction of the alignment film, or in the flow direction and Inspection of a liquid crystal compound alignment layer transfer laminate comprising a step of irradiating linearly polarized light having an electric field oscillation direction parallel to an orthogonal direction from the alignment film surface of the laminate, and receiving light from the liquid crystal compound alignment layer surface side Way. An alignment film for transferring a liquid crystal compound alignment layer to an object, wherein the thermal contraction rate for 30 minutes at 150°C in the flow direction of the alignment film and the thermal contraction rate at 150°C for 30 minutes in the direction orthogonal to the flow direction of the alignment film The alignment film for liquid crystal compound alignment layer transfer, characterized in that the difference is 4% or less. 8. The method of claim 7,
The difference between the thermal contraction rate for 30 minutes at 150 ° C in the direction of 45 degrees with respect to the flow direction of the oriented film and the thermal contraction rate at 150 ° C for 30 minutes at 135 degrees with respect to the flow direction of the oriented film is 4% or less, characterized in that An alignment film for liquid crystal compound alignment layer transfer. 9. The method according to claim 7 or 8,
The alignment film for liquid crystal compound alignment layer transfer, characterized in that the alignment film is a polyester film. A laminate in which a liquid crystal compound alignment layer and an alignment film are laminated, wherein the alignment film is the alignment film according to any one of claims 7 to 9, wherein the liquid crystal compound alignment layer transfer laminate. A liquid crystal compound alignment layer laminated polarizing plate comprising the steps of bonding the polarizing plate and the liquid crystal compound alignment layer surface of the laminate according to claim 10 to form an intermediate laminate, and peeling the alignment film from the intermediate laminate. manufacturing method. As a method of inspecting the orientation state of the liquid crystal compound orientation layer in the laminate according to claim 10, in the orientation direction of the orientation film, or in a direction orthogonal to the orientation direction, or in the flow direction of the orientation film, or in the flow direction and Inspection of a liquid crystal compound alignment layer transfer laminate comprising a step of irradiating linearly polarized light having an electric field oscillation direction parallel to an orthogonal direction from the alignment film surface of the laminate, and receiving light from the liquid crystal compound alignment layer surface side Way. An oriented polyester film for transferring a liquid crystal compound alignment layer to an object, characterized in that the precipitation amount of the ester cyclic trimer on the surface of the release surface of the oriented polyester film after heating at 150° C. for 90 minutes is 1.0 mg/m 2 or less An oriented polyester film for liquid crystal compound alignment layer transfer. 14. The method of claim 13,
The oriented polyester film for liquid-crystal compound orientation layer transcription|transfer whose content of the ester cyclic trimer in the polyester resin which comprises the release surface side layer of an orientation polyester film is 0.7 mass % or less. The orientation polyester film for liquid crystal compound orientation layer transcription|transfer of Claim 13 or 14 in which the coating layer which prevents precipitation of an ester cyclic trimer is provided in the mold release surface of an orientation polyester film. A laminate in which a liquid crystal compound alignment layer and an alignment polyester film are laminated, wherein the alignment polyester film is the alignment polyester film according to any one of claims 13 to 15, for liquid crystal compound alignment layer transfer laminate. A liquid crystal compound alignment layer comprising a step of bonding a polarizing plate and a surface of the liquid crystal compound alignment layer of the laminate according to claim 16 to form an intermediate laminate, and a step of peeling the alignment polyester film from the intermediate laminate. A method for manufacturing a laminated polarizing plate. As a method of inspecting the orientation state of the liquid crystal compound orientation layer in the laminate according to claim 16, in the orientation direction of the orientation polyester film, or in a direction orthogonal to the orientation direction, or in the flow direction of the orientation polyester film, or irradiating linearly polarized light having an electric field oscillation direction parallel to the direction orthogonal to the flow direction from the alignment polyester film side of the laminate, and receiving light from the liquid crystal compound alignment layer side side. Inspection method of laminate for transfer.