JP2016122158A - Transfer film, optical film, method for manufacturing transfer film, and method for manufacturing optical film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce damage of a phase-difference layer of an optical film prepared by transferring the phase-difference layer by a transfer method.SOLUTION: The present invention includes: a supporting body base material 21; an orientation layer 22 on the supporting body base material 21; and a phase-difference layer 19 on the orientation layer 22 providing phase difference with a transmitting light. The phase-difference layer 19 has an IR peak ratio Peak(810 cm)/Peak(830 cm), which is a ratio of 810 cmIR peak Peak(810 cm) to 830 cmIR peak Peak(830 cm), of not larger than 0.51 in the infrared spectroscopy spectrum.SELECTED DRAWING: Figure 2

Description

  The present invention can be applied to, for example, an antireflection film formed by laminating a linearly polarizing plate and a half-wave retardation layer.

  Conventionally, various optical films having a retardation layer made of a liquid crystal material have been proposed and used in various ways. Specifically, for example, for an image display device, an antireflection film, which is an optical film made of a circularly polarizing plate, is arranged on the panel surface (viewer side surface) of the image display panel, and reflection of extraneous light is reduced by this antireflection film. A method has been proposed.

  This antireflection film is composed of a laminate of a linearly polarizing plate and a quarter wavelength plate, converts external light directed to the panel surface of the image display panel into linearly polarized light by the linearly polarizing plate, and then continues to a circle by the quarter wavelength plate. Convert to polarized light. Here, the extraneous light by the circularly polarized light is reflected by the surface of the image display panel or the like, but the rotation direction of the polarization plane is reversed during the reflection. As a result, contrary to the arrival time, this reflected light is converted into linearly polarized light in the direction shielded by the linear polarizing plate by the quarter wavelength plate, and then shielded by the subsequent linear polarizing plate. Outgoing emission is significantly suppressed.

  Conventionally, a retardation film having a retardation layer made of a liquid crystal material has been produced as a retardation plate such as a quarter-wave plate. That is, such a retardation film is prepared by preparing an alignment layer on the surface of a substrate made of a transparent film material, and then applying, drying, and curing the coating liquid related to the retardation layer, thereby regulating the alignment of the alignment layer. A phase difference layer is produced by solidifying the liquid crystal material in an aligned state by force, and a desired phase difference is imparted to transmitted light by the phase difference layer.

  In this type of optical film such as an antireflection film, it is considered that the entire thickness can be reduced by producing it by a so-called transfer method. Here, the transfer method means that, for example, when a desired layer is formed on a substrate or the like, this layer is not directly formed on the substrate or the like, but once on a releasable support. After the layer is formed so as to be peelable and a transfer body is produced, the layer formed on the support is finally formed on the support according to the process, demand, etc. It is a method of forming a desired layer on the substrate or the like by bonding and laminating on the body, and then peeling and removing the support (Patent Documents 1 to 4).

  That is, for example, when the transfer method is applied to an antireflection film using a circularly polarizing plate, a transfer film in which a support substrate, an alignment layer, and a retardation layer are sequentially laminated is prepared, and the retardation layer is on the linearly polarizing plate side. Thus, after sticking this transfer film on a linearly polarizing plate, the support substrate is peeled off. Thereby, the thickness of a support base material can be reduced and an antireflection film can be produced with a circularly polarizing plate.

  However, when the support substrate is peeled off, in the conventional transfer film, the support substrate peels off at the interface between the retardation layer and the alignment layer, and as a result, the retardation layer is exposed after the transfer. As a result, the conventional antireflection film or the like has a problem that the retardation layer is easily damaged during the production process. In the antireflection film, if the retardation layer is damaged, it becomes impossible to impart a desired retardation to the transmitted light by the retardation layer at the damaged portion, so that the antireflection function is locally impaired and the optical characteristics deteriorate. Will do.

JP 2005-309290 A JP 2006-323349 A JP 2005-309290 A JP 2006-323349 A

  This invention is made | formed in view of such a condition, It aims at reducing the damage of a phase difference layer regarding the optical film produced by transferring a phase difference layer by the transfer method.

  The present inventor has made extensive studies to solve the above problems, and after curing the retardation layer by irradiation with ultraviolet rays from the coating layer side, the reaction of the retardation layer by irradiation with ultraviolet rays from the substrate side. The idea of further proceeding was reached, and the present invention was completed.

  Specifically, the present invention provides the following.

(1) a support substrate;
An alignment layer provided on the support substrate;
A retardation layer provided on the alignment layer and imparting a retardation to transmitted light;
The retardation layer is
In infrared spectroscopy spectrum, an IR peak Peak (810 cm ^-1) ratio of 810 cm ^-1 to IR peak of 830cm ^-1 Peak (830cm ^-1) IR peak ratio ^{Peak (810cm -1) / Peak (} 830cm -1 ) Is 0.51 or less.

According to (1), when the IR peak ratio Peak (810 cm ⁻¹ ) / Peak (830 cm ⁻¹ ) is 0.51 or less, the alignment layer is compared with the adhesion between the alignment layer and the support substrate. It is possible to increase the adhesion between the liquid crystal and the retardation layer. Accordingly, when the support substrate is peeled off by the transfer method, the peeling interface can be used as the interface between the support substrate and the alignment layer, and the retardation layer and the alignment layer can be transferred integrally. As a result, in the subsequent steps, this alignment layer can function as a protective layer for the retardation layer, and damage to the retardation layer can be reduced.

(2) In an optical film comprising a retardation layer that imparts a retardation to transmitted light,
The retardation layer is
Provided on the base material by the transparent film material through at least the optical functional layer,
On the side opposite to the substrate, an alignment layer is provided,
The retardation layer is
In infrared spectroscopy spectrum, an IR peak Peak (810 cm ^-1) ratio of 810 cm ^-1 to IR peak of 830cm ^-1 Peak (830cm ^-1) IR peak ratio ^{Peak (810cm -1) / Peak (} 830cm -1 ) Is 0.51 or less.

  According to (2), the retardation layer can be transferred integrally with the alignment layer by the transfer method, and this alignment layer can function as a protective layer for the retardation layer, thereby reducing damage to the retardation layer. it can.

(3) In (2),
The optical functional layer is
An optical film that is an optical functional layer that functions as a linear polarizing plate.

  According to (3), the optical film formed by transferring the retardation layer and the alignment layer to the linearly polarizing plate by a transfer method can be provided.

(4) an alignment layer preparation step of preparing an alignment layer on a support substrate;
On the alignment layer, a retardation layer coating liquid is applied and dried to prepare the retardation layer coating layer, and then the retardation layer coating layer is cured to form the retardation layer. A phase difference layer production step for producing a phase difference layer;
The step of producing the retardation layer includes
A pre-curing step of curing the coating layer of the retardation layer by irradiating ultraviolet rays from the coating layer side of the retardation layer;
Following the pre-curing step, a post-curing step of irradiating ultraviolet rays from the support substrate side to cure the coating layer of the retardation layer.

  According to (4), following the pre-curing step, the reaction of the retardation layer is sufficiently achieved by providing a post-curing step of curing the coating layer of the retardation layer by irradiating ultraviolet rays from the support substrate side. The adhesion between the alignment layer and the retardation layer can be increased as compared with the adhesion between the alignment layer and the support substrate. Accordingly, when the support substrate is peeled off by the transfer method, the peeling interface can be used as the interface between the support substrate and the alignment layer, and the retardation layer and the alignment layer can be transferred integrally. As a result, in the post-transfer process, this alignment layer can function as a protective layer for the retardation layer, and damage to the retardation layer can be reduced.

(5) In (4),
The step of producing the retardation layer includes
By irradiation with the ultraviolet rays in the post-curing step,
In infrared spectroscopy spectrum, an IR peak Peak (810 cm ^-1) ratio of 810 cm ^-1 to IR peak of 830cm ^-1 Peak (830cm ^-1) IR peak ratio ^{Peak (810cm -1) / Peak (} 830cm -1 ) Is 0.51 or less to form the retardation layer.

According to (5), when the IR peak ratio Peak (810 cm ⁻¹ ) / Peak (830 cm ⁻¹ ) is 0.51 or less, more specifically, the ratio of the adhesive strength between the alignment layer and the support substrate is higher. Thus, the adhesion between the alignment layer and the retardation layer can be increased.

(6) a transfer film manufacturing process for manufacturing a transfer film by laminating a support substrate, an alignment layer, and a retardation layer;
The transfer body is provided with a production process of an optical film in which a phase difference layer of the transfer film is disposed integrally with the alignment layer by a transfer method,
The transfer film production process includes:
An alignment layer preparation step of preparing the alignment layer on the support substrate;
On the alignment layer, a coating layer for the retardation layer is prepared by coating and drying the coating liquid for the retardation layer, and then the coating layer for the retardation layer is cured to produce the coating layer for the retardation layer. A phase difference layer production step for producing a phase difference layer;
The step of producing the retardation layer includes
A pre-curing step of curing the coating layer of the retardation layer by irradiating ultraviolet rays from the coating layer side of the retardation layer;
Following the pre-curing step, an optical film manufacturing method comprising a post-curing step of curing the coating layer of the retardation layer by irradiating ultraviolet rays from the support substrate side.

  According to (6), following the pre-curing step, the reaction of the retardation layer is sufficiently achieved by providing a post-curing step of curing the coating layer of the retardation layer by irradiating ultraviolet rays from the support substrate side. The adhesion between the alignment layer and the retardation layer can be increased as compared with the adhesion between the alignment layer and the support substrate. Accordingly, when the support substrate is peeled off by the transfer method, the peeling interface can be used as the interface between the support substrate and the alignment layer, and the retardation layer and the alignment layer can be transferred integrally. As a result, in the post-transfer process, this alignment layer can function as a protective layer for the retardation layer, and damage to the retardation layer can be reduced.

(7) In (6),
The step of producing the retardation layer includes
By irradiation with the ultraviolet rays in the post-curing step,
In infrared spectroscopy spectrum, an IR peak Peak (810 cm ^-1) ratio of 810 cm ^-1 to IR peak of 830cm ^-1 Peak (830cm ^-1) IR peak ratio ^{Peak (810cm -1) / Peak (} 830cm -1 ) Is 0.51 or less to form the retardation layer.

  According to (7), when the IR peak ratio Peak (810 cm-1) / Peak (830 cm-1) is 0.51 or less, it is more specifically compared to the adhesion between the alignment layer and the support substrate. Thus, the adhesion between the alignment layer and the retardation layer can be increased.

  ADVANTAGE OF THE INVENTION According to this invention, the damage of a phase difference layer can be reduced regarding the optical film produced by transferring a phase difference layer by the transfer method.

It is a figure which shows the image display apparatus which concerns on embodiment of this invention. It is a figure which shows the transfer film which concerns on the image display apparatus of FIG. It is a figure which shows the manufacturing process of the transfer film of FIG. It is a figure which shows a manufacturing process of the antireflection film which concerns on the image display apparatus of FIG. It is a figure where it uses for description of IR peak ratio. It is a figure where it uses for description of measurement conditions.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[First Embodiment]
[Image display device and optical component]
FIG. 1 is a diagram showing an image display apparatus according to the first embodiment of the present invention. In this image display device 11, an antireflection film 13 for preventing reflection by the function of a circularly polarizing plate is disposed on the panel surface (viewer side surface) of the image display panel 12. Here, the image display panel 12 is an organic EL panel, for example, and displays a desired color image. The image display panel 12 is not limited to an organic EL panel, and various image display panels such as a liquid crystal display panel can be widely applied.

  The antireflection film 13 is attached to and held on the panel surface of the image display panel 12 by an adhesive layer 14 made of PSA (PRSurRe Sensitive Adhesive) adhesive. The antireflection film 13 is formed by laminating and integrating a linear polarizing plate 15 and a quarter-wave plate 16 with an adhesive layer 18 made of a PSA adhesive. In addition, it may replace with the adhesive layer by a PSA adhesive, and you may arrange | position the antireflection film 13 with another adhesive and an adhesive agent, and also make it laminate | stack the linearly-polarizing plate 15 and the quarter wavelength plate 16. Good. Examples of such other pressure-sensitive adhesives and adhesives include ultraviolet curable resins and thermosetting resins.

  The linearly polarizing plate 15 is configured by sandwiching an optical functional layer that functions as a linearly polarizing plate between a pair of base materials. Here, the base material is a transparent film made of TAC (triacetylcellulose), poly (meth) methyl acrylate, poly (meth) butyl acrylate, methyl (meth) acrylate-butyl (meth) acrylate copolymer, ( A resin such as an acrylic resin such as a (meth) methyl acrylate-styrene copolymer, a glass such as soda glass, potassium glass, lead glass, and quartz glass can be applied. The optical functional layer is produced, for example, by adsorbing and orienting iodine compound molecules on a film material made of polyvinyl alcohol (PVA).

  The quarter wave plate 16 is formed by the retardation layer 19. In this embodiment, the retardation layer 19 is transferred from a transfer film, which will be described later, together with the alignment layer 22 by a transfer method. Accordingly, the antireflection film 13 is protected by the alignment layer 22 so that the retardation layer 19 is not exposed, and damage of the retardation layer 19 in the production process is reduced as compared with the conventional case.

[Transfer film]
FIG. 2 is a view showing a transfer film used for producing the antireflection film 13. In this transfer film 20, an orientation layer 22 and a retardation layer 19 are provided on a support substrate 21. The antireflection film 13 is formed by laminating the retardation layer 19 provided on the transfer film 20 on the linear polarizing plate 15 together with the alignment layer 22 by a transfer method.

  Here, although various transparent film materials such as a TAC film can be applied to the support base material 21, in this embodiment, an adhesion strengthening treatment such as a corona treatment for improving the adhesion strength with the alignment layer 22 is performed. A transparent film material made of PET (polyethylene terephthalate) resin which is not applied at all is applied.

  The transfer film 20 is cured in a state in which the liquid crystal material related to the retardation layer 19 is aligned by the alignment regulating force of the alignment layer 22, thereby forming the retardation layer 19. As the alignment layer 22, various configurations capable of aligning the liquid crystal material related to the retardation layer 19 can be applied, but in this embodiment, a photo-alignment layer is applied. Thereby, after the material layer which concerns on the photo-alignment layer is formed on the base material 21 by application | coating and drying of the coating liquid which concerns on the photo-alignment layer, the transfer film 20 is aligned layer 22 by irradiation of the ultraviolet-ray by a linearly polarized light. Is formed. In addition, although the material which concerns on this photo-alignment layer can apply the various materials which can apply the technique of photo-alignment, in this embodiment, a light dimerization type material is used, for example. This light dimerization type material is described in “M. Schadt, K. Schmitt, V. Kozinkov and V. ChigReinov: Jpn. J. Appl. Phys., 31, 155 (1992)”, “M. Schadt, H. SeireRele and A. SchusteRe: NaturRe, 381,212 (1996) ".

The retardation layer 19 is solidified (cured) in a state where the liquid crystal material is aligned by the alignment regulating force of the alignment layer 22 by applying and drying the corresponding coating liquid and then curing by irradiation with ultraviolet rays. Produced. Retardation layer 19, 810 cm by proceeding sufficiently reaction sufficiently irradiated with ultraviolet rays according to this curing, infrared spectroscopy in (IR) spectrum, to IR peak Peak (830 cm ^-1) of 830 cm ^{-1 - 1} of the IR peak peak (810 cm ^-1) IR peak ratio is the ratio ^{peak (810cm -1) / peak (} 830cm -1) is set to be 0.51 or less. The IR peak ratio Peak (810 cm ⁻¹ ) / Peak (830 cm ⁻¹ ) is measured by the ATR (total reflection attenuation) method using, for example, FT-IR-610 manufactured by JASCO Corporation. It is calculated by measuring.

Here, the IR peak at 830 cm ^{−1 is} an IR peak derived from p-substituted benzene that does not disappear by the reaction due to ultraviolet irradiation, and the IR peak at 810 cm ^{−1 is} an IR peak derived from C═C that disappears by the reaction due to ultraviolet irradiation. There, in this way this type of coating layer to be subjected to production of the phase difference layer 19, as the reaction proceeds, gradually the value of the IR peak ratio ^{peak (810cm -1) / peak (} 830cm -1) becomes small.

Here, in the transfer film 20, when the IR peak ratio Peak (810 cm ⁻¹ ) / Peak (830 cm ⁻¹ ) of the retardation layer 19 is 0.52 or more, the adhesion between the alignment layer 22 and the support substrate 21. As a result, when the support substrate 21 is peeled off, the interface between the orientation layer 22 and the retardation layer 19 becomes a peeling interface. Therefore, in this case, the transfer of the retardation layer 19 to the linearly polarizing plate 15 causes the alignment layer 22 to peel from the retardation layer 19 integrally with the support substrate 21, and the retardation layer 19 is exposed.

On the other hand, when the reaction of the retardation layer 19 proceeds to a certain level or more and the IR peak ratio Peak (810 cm ⁻¹ ) / Peak (830 cm ⁻¹ ) is 0.51 or less, the alignment layer 22 and the support substrate 21 are separated from each other. When the adhesion layer 22 and the phase difference layer 19 have a larger adhesion force than the adhesion force, and the support substrate 21 is peeled off, the interface between the alignment layer 22 and the support substrate 21 becomes a peeling interface. . Accordingly, in this case, the alignment layer 22 is transferred to the linear polarizing plate 15 together with the retardation layer 19 by transferring the retardation layer 19 to the linear polarizing plate 15. The retardation layer 19 can be protected by the alignment layer 22 by causing the layer 22 to function as a protective layer of the retardation layer 19. Thereby, in this embodiment, in the manufacturing process of the antireflection film 13, damage to the retardation layer 19 can be reduced.

In this connection, due to the change in the adhesion between the support substrate 21 and the alignment layer 22, the peeling interface when peeling the support substrate 21 is changed from the interface between the support substrate 21 and the alignment layer 22. And the phase difference layer 19 change. However, in the case where a PET film that has not been subjected to an adhesion strengthening treatment that reinforces the adhesion with the alignment layer 22 is applied to the support substrate 21, when various materials are applied to the alignment layer 22, the phase difference Even when various materials are applied to the layer 19, by setting the IR peak ratio Peak (810 cm ⁻¹ ) / Peak (830 cm ⁻¹ ) to 0.51 or less, the alignment layer 22 and the support substrate 21 The interface can be a peeling interface.

  For the retardation layer 19, various polymerizable liquid crystal compositions, which are liquid crystal materials exhibiting optical anisotropy, can be applied. Here, the polymerizable liquid crystal composition exhibits liquid crystallinity and can contain an antiblocking agent or the like in addition to a liquid crystal compound having a polymerizable functional group in the molecule (hereinafter also referred to as “rod-like compound”). .

  The rod-shaped compound according to the retardation layer 19 has refractive index anisotropy, and has a function of imparting desired retardation by being regularly arranged by the alignment regulating force of the alignment layer 22. Examples of the rod-like compound include materials exhibiting a liquid crystal phase such as a nematic phase and a smectic phase, but the nematic phase is easier to arrange regularly than liquid crystal compounds exhibiting other liquid crystal phases. It is more preferable to use the rod-shaped compound shown.

  Specific examples of the rod-shaped compound used in the present embodiment include compounds represented by the following formulas (1) to (13), and these compounds can be polymerized and used.

（ｇは２〜５の整数）

(G is an integer of 2 to 5)

〔Manufacturing process〕
The transfer film 20 is provided with a base material 21 in the form of a long film wound around a roll, and after the orientation layer 22 and the retardation layer 19 are sequentially produced while the base material 21 is pulled out from the roll and conveyed, the roll And is conveyed to the optical film manufacturing process.

  FIG. 3 is a diagram illustrating a manufacturing process of the transfer film 20. In the manufacturing process 30, the base material 21 is provided by the roll 31, and the base material 21 is conveyed while being pulled out from the roll 31, and the coating liquid for the alignment layer 22 is applied by the die 32. Subsequently, after drying the applied coating liquid in the drying device 33, the coating liquid is cured by irradiation with ultraviolet rays by linearly polarized light from the light source 34, thereby producing the alignment layer 22.

  Subsequently, in the manufacturing process 30, the coating liquid related to the retardation layer 19 is applied onto the alignment layer 22 by the die 35 and then dried by the drying device 36. Further, subsequently, in the pre-curing step, the light source 37 irradiates ultraviolet rays, and thereby the liquid crystal material is cured in an aligned state by the alignment regulating force of the alignment layer 22, thereby producing the retardation layer 19. Here, the irradiation of the ultraviolet rays is performed from the coating surface side of the coating liquid related to the retardation layer 19, and thereby the ultraviolet rays are efficiently irradiated onto the coating layer to produce the retardation layer 19. In addition, in the coating of the coating liquid which concerns on an orientation layer and a phase difference layer, not only coating by die | dye but various methods can be applied widely.

In this embodiment, a post-curing step is performed in which the retardation layer 19 is produced in this way, and additional irradiation of ultraviolet rays that further promotes the reaction of the retardation layer 19 is performed. However, according to the results of various experiments, simply adding an ultraviolet irradiation step and irradiating ultraviolet rays from the coated surface side does not cause a reaction to exceed a certain level, and the IR peak ratio Peak (810 cm-1) / Peak ( It has been found that 830 cm ⁻¹ ) does not decrease below 0.52. This is considered to be due to the influence of the ultraviolet absorber contained in the retardation layer 19. Therefore, in this embodiment, the light source 38 is provided on the support base material 21 side, and the reaction of the retardation layer 19 is advanced by irradiation of ultraviolet rays from the support base material 21 side.

  In the manufacturing process 30, the transfer film 20 having a long film shape thus manufactured is wound around a roll 39 and conveyed to an integration process with a linearly polarizing plate.

  FIG. 4 is a diagram illustrating an integration process with the linearly polarizing plate. In this manufacturing process, the transfer film 20 is provided by the roll 39. The linearly polarizing plate 15 is supplied by the roll 42 in a state where the adhesive layer 18 and the release film 41 made of a PET film are arranged. In this manufacturing process, the peeling film 41 is peeled off by the peeling roll 43 while the laminate of the linearly polarizing plate 15, the adhesive layer 18, and the peeling film 41 is pulled out from the roll 42, and the peeled peeling film 41 is wound around the roll 44. In addition, while pulling out the transfer film 20 from the roll 39, it is laminated with the linear polarizing plate 15 and the adhesive layer 18 formed by peeling the release film 41, and then pressed by the pressure roll 45, thereby transferring the transfer film 20 and the linear polarizing plate 15. The laminated body of the adhesion layer 18 is comprised. Further, the substrate 21 is peeled off by the subsequent peeling roll 46 and wound around the roll 47, thereby forming a laminate of the linearly polarizing plate 15, the adhesive layer 18, the retardation layer 19, and the orientation layer 22, thereby forming the antireflection film 13. The antireflection film 13 is prepared and wound on a roll 48. The manufacturing process of the antireflection film 13 is then cut into a desired size after arranging the adhesive layer 14 and the separator film.

FIG. 5 is a measurement result showing a change in IR peak ratio Peak (810 cm ⁻¹ ) / Peak (830 cm ⁻¹ ) due to additional ultraviolet irradiation in the post-curing process. As shown in FIG. 6, the measurement result is obtained by laminating and integrating the linear polarizing plate 15 and the transfer film via the adhesive layer 18, and then peeling off the support base material 21 and the alignment layer 22. It is the result of having measured the surface of this as a measurement surface. When the support base material 21 was peeled off and the alignment layer 22 remained on the retardation layer 19 side, the alignment layer 22 was removed by etching to expose the surface of the retardation layer 19 to obtain a measurement surface. The IR peak ratio Peak (810 cm ⁻¹ ) / Peak (830 cm ⁻¹ ) was measured by ATR (total reflection attenuation) method using FT-IR-610 manufactured by JASCO Corporation.

Here, as the support base material 21, a PET film having a thickness of 100 μm which has not been subjected to any adhesion strengthening treatment is applied. The alignment layer 22 was prepared by applying a corresponding coating solution so as to have a dry film thickness of 200 μm, drying with hot air at 120 ° C., and irradiating linearly polarized ultraviolet rays with a light amount of 20 mJ / cm ² . The coating liquid for the alignment layer 22 was prepared with a PGME solvent so that the solid content was 4.5%. The retardation layer 19 was prepared by applying a corresponding coating solution so as to have a dry film thickness of 1 μm, then drying with hot air at 90 ° C., and irradiating with ultraviolet rays related to pre-curing with a light amount of 450 mJ / cm ² . . In addition, the coating liquid of this phase difference layer 19 was produced so that it might become 25% of solid content with MEK: MIBK = 1: 1 mixed solvent.

Symbol L21 is a measurement result when additional ultraviolet irradiation is performed from the support substrate 21 side, and symbol L19 is a measurement result when additional ultraviolet irradiation is performed from the retardation layer 19 side. Unirradiated is IR peak ratio in the case of not executing the ultraviolet irradiation by adding ^{Peak (810cm -1) / Peak (} 830cm -1), in this case, IR peak ratio ^{Peak (810cm -1) / Peak (} 830cm -1 ) Is 0.565, and as a result, the reaction of the retardation layer 19 progresses until the IR peak ratio Peak (810 cm ⁻¹ ) / Peak (830 cm ⁻¹ ) becomes 0.565 due to ultraviolet irradiation from the coated surface. Will be. In this unirradiated sample, the peeling interface was the interface between the alignment layer 22 and the retardation layer 19.

Figure in the measurement result 5, the transfer film the IR peak ratio ^{Peak (810cm -1) / (Peak} (830cm -1) is 0.565, the amount of light ^{250mJ / cm 2, 500mJ / cm} 2, 750mJ / cm 2 When the additional ultraviolet irradiation is performed by irradiating the ultraviolet rays from the coating layer side and the support substrate 21 side respectively, the IR peak ratio is gradually increased regardless of which side is irradiated with the ultraviolet rays due to the increase in the amount of ultraviolet irradiation light. ^{peak (810cm -1) / peak (} 830cm -1) is reduced. However, when irradiated with ultraviolet light from the phase difference layer 19 side, the light amount is more than ^{500mJ / cm 2, 750mJ / cm} 2, IR peak ratio peak ( 810 cm ⁻¹ ) / Peak (830 cm ⁻¹ ) decreases, and saturation characteristics are observed in the change in the IR peak ratio Peak (810 cm ⁻¹ ) / Peak (830 cm ⁻¹ ), whereby the retardation layer 19 side case of irradiation with ultraviolet rays, IR peak ratio peak (810 cm ^-1) Reducing Peak to (830 cm ^-1) to 0.51 or less is determined to be difficult.

On the other hand, when irradiating ultraviolet rays from the support base material 21 side, the IR peak ratio Peak (810 cm ⁻¹ ) / Peak (830 cm ⁻¹ ) is reduced in proportion to the amount of irradiation light, which makes it easy and simple. The IR peak ratio Peak (810 cm ⁻¹ ) / Peak (830 cm ⁻¹ ) can be efficiently reduced to 0.51 or less.

Here, in each sample having an IR peak ratio Peak (810 cm ⁻¹ ) / Peak (830 cm ⁻¹ ) of 0.52 or more, the peeling interface is an interface between the retardation layer 19 and the alignment layer 22, and thus, according to the symbol A. When the IR peak ratio Peak (810 cm ⁻¹ ) / Peak (830 cm ⁻¹ ) shown is 0.52 or more, if the support base material 21 is peeled off, the orientation layer 22 is peeled off together with the support base material 21. I found out.

On the other hand, in the sample having an IR peak ratio Peak (810 cm ⁻¹ ) / Peak (830 cm ⁻¹ ) of 0.51, the peeling interface is the interface between the alignment layer 22 and the support substrate 21, thereby It can be seen that when the IR peak ratio Peak (810 cm ⁻¹ ) / Peak (830 cm ⁻¹ ) shown in FIG. 5 is 0.51 or less, when the support substrate 21 is peeled off, the alignment layer 22 is left behind on the phase difference layer 19 side. It was.

[Other Embodiments]
As mentioned above, although the specific structure suitable for implementation of this invention was explained in full detail, this invention can be variously changed in the range which does not deviate from the meaning of this invention.

  That is, in the above-described embodiment, the case where the present invention is applied to the optical film by the antireflection film that prevents reflection by the function of the circularly polarizing plate has been described. However, the present invention is not limited to this, and for example, a three-dimensional image by a passive method Pattern retardation film and linearly polarizing plate were integrated by arranging the retardation layer related to the patterned retardation film applied to display on the linearly polarizing plate placed on the exit surface of the liquid crystal display panel by the transfer method An optical film, an optical film in which a retardation layer related to a retardation film that prevents a change in brightness of a display screen depending on a viewing direction by polarized sunglasses is disposed by a transfer method on a linear polarizing plate disposed on an output surface of a liquid crystal display panel. It can be widely applied to films and the like.

DESCRIPTION OF SYMBOLS 11 Image display apparatus 12 Image display panel 13 Antireflection film 14, 18 Adhesive layer 15 Linear polarizing plate 16 1/4 wavelength plate 19 Phase difference layer 20 Transfer film 21 Support base material 22 Orientation layer 30 Manufacturing process 31, 39, 42 -48 rolls 32, 35 dies 33, 36 drying devices 34, 37, 38 light source 41 release film 41-48 rolls

Claims (7)

A support substrate;
An alignment layer provided on the support substrate;
A retardation layer provided on the alignment layer and imparting a retardation to transmitted light;
The retardation layer is
In infrared spectroscopy spectrum, an IR peak Peak (810 cm ^-1) ratio of 810 cm ^-1 to IR peak of 830cm ^-1 Peak (830cm ^-1) IR peak ratio ^{Peak (810cm -1) / Peak (} 830cm -1 ) Is 0.51 or less. In an optical film comprising a retardation layer that imparts a retardation to transmitted light,
The retardation layer is
Provided on the base material by the transparent film material through at least the optical functional layer,
On the side opposite to the substrate, an alignment layer is provided,
The retardation layer is
In infrared spectroscopy spectrum, an IR peak Peak (810 cm ^-1) ratio of 810 cm ^-1 to IR peak of 830cm ^-1 Peak (830cm ^-1) IR peak ratio ^{Peak (810cm -1) / Peak (} 830cm -1 ) Is 0.51 or less. The optical functional layer is
The optical film according to claim 2, which is an optical functional layer having a function as a linear polarizing plate. An alignment layer preparation step of preparing an alignment layer on a support substrate;
On the alignment layer, a retardation layer coating liquid is applied and dried to prepare the retardation layer coating layer, and then the retardation layer coating layer is cured to form the retardation layer. A phase difference layer production step for producing a phase difference layer;
The step of producing the retardation layer includes
A pre-curing step of curing the coating layer of the retardation layer by irradiating ultraviolet rays from the coating layer side of the retardation layer;
Subsequent to the pre-curing step, a post-curing step of curing the coating layer of the retardation layer by irradiating ultraviolet rays from the support substrate side. The step of producing the retardation layer includes
By irradiation with the ultraviolet rays in the post-curing step,
In infrared spectroscopy spectrum, an IR peak Peak (810 cm ^-1) ratio of 810 cm ^-1 to IR peak of 830cm ^-1 Peak (830cm ^-1) IR peak ratio ^{Peak (810cm -1) / Peak (} 830cm -1 The method for producing a transfer film according to claim 4, wherein the retardation layer is formed by 0.51 or less. A transfer film production process for producing a transfer film by laminating a support substrate, an alignment layer, and a retardation layer;
The transfer body is provided with a production process of an optical film in which a phase difference layer of the transfer film is disposed integrally with the alignment layer by a transfer method,
The transfer film production process includes:
An alignment layer preparation step of preparing the alignment layer on the support substrate;
On the alignment layer, a coating layer for the retardation layer is prepared by coating and drying the coating liquid for the retardation layer, and then the coating layer for the retardation layer is cured to produce the coating layer for the retardation layer. A phase difference layer production step for producing a phase difference layer;
The step of producing the retardation layer includes
A pre-curing step of curing the coating layer of the retardation layer by irradiating ultraviolet rays from the coating layer side of the retardation layer;
Following the pre-curing step, a post-curing step of curing the coating layer of the retardation layer by irradiating ultraviolet rays from the support substrate side. The step of producing the retardation layer includes
By irradiation with the ultraviolet rays in the post-curing step,
In infrared spectroscopy spectrum, an IR peak Peak (810 cm ^-1) ratio of 810 cm ^-1 to IR peak of 830cm ^-1 Peak (830cm ^-1) IR peak ratio ^{Peak (810cm -1) / Peak (} 830cm -1 ) Is 0.51 or less to form the retardation layer. The method for producing an optical film according to claim 6.

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