Method for manufacturing polarizing plate with phase difference layer

Abstract

The present application provides a simple and effective manufacturing method of a polarizing plate with a phase difference layer in which warping is suppressed. According to an embodiment of the present application, a manufacturing method of a polarizing plate with a phase difference layer having a polarizer, a protective layer disposed on one side of the polarizer, and a phase difference layer disposed on the other side of the polarizer is provided. The manufacturing method includes: performing a humidification treatment while roll-transporting an intermediate laminate in which a water-absorbing film is temporarily attached to the phase difference layer side of the polarizing plate with a phase difference layer; and storing the intermediate laminate subjected to the humidification treatment for 12 hours or more, the moisture permeability of the protective layer at 40°C and 92% RH being 100 g / m 2 • 24h or less, the phase difference layer is an oriented and cured layer of a liquid crystal compound.

Description

Technical Field

[0001] This invention relates to a method for manufacturing a polarizer with a phase retardation layer. Background Technology

[0002] Image display devices, represented by liquid crystal displays and electroluminescent (EL) displays (e.g., organic EL displays and inorganic EL displays), are rapidly gaining popularity. Polarizers and retardation plates are typically used in image display devices. In practical applications, polarizers with a retardation layer, obtained by integrating the polarizer and retardation plate, are widely used (e.g., Patent Document 1). In recent years, the possibilities for bending, buckling, folding, and rolling image display devices have been studied, with the aim of making image display devices thinner. Along with this, the thinning of polarizers with retardation layers is also desired. However, thin polarizers with retardation layers are prone to warping. The warping problem is particularly pronounced in polarizers with retardation layers that have a low moisture permeability protective layer only on one side of the polarizer and contain an alignment-cured layer of liquid crystal compound, i.e., the retardation layer.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent No. 3325560 Summary of the Invention

[0006] The problem that the invention aims to solve

[0007] The present invention was made to solve the above-mentioned problems, and its main objective is to provide a simple and effective manufacturing method for a polarizer with a phase difference layer that suppresses warping.

[0008] Methods for solving problems

[0009] According to an embodiment of the present invention, a method for manufacturing a polarizer with a phase retardation layer is provided, comprising a polarizer, a protective layer disposed on one side of the polarizer, and a phase retardation layer disposed on the other side of the polarizer. The manufacturing method includes: humidifying an intermediate laminate to which a water-absorbing film is temporarily adhered on the phase retardation layer side of the polarizer with the phase retardation layer while roller conveying; storing the humidified intermediate laminate for at least 12 hours; and ensuring that the protective layer has a moisture permeability of 100 g / m³ at 40°C and 92% RH. 2 • For less than 24 hours, this phase difference layer is an orientation-cured layer of the liquid crystal compound.

[0010] In one embodiment, the water absorption rate of the absorbent membrane is 2% or more. In one embodiment, the absorbent membrane is a triacetylcellulose membrane. In one embodiment, the thickness of the absorbent membrane is 40 μm or more. In one embodiment, the moisture permeability of the absorbent membrane at 40°C and 92% RH is 300 g / m³. 2 ·More than 24h.

[0011] In one embodiment, the humidification treatment is carried out at a temperature below 34°C and a water vapor concentration of 13.8 g / m³. 3 The process is carried out under the above conditions. In one embodiment, the humidification time in the above humidification process is 5 minutes or more.

[0012] In one embodiment, the intermediate laminate subjected to the above-described humidification treatment is stored for 24 hours or more. In another embodiment, the intermediate laminate subjected to the above-described humidification treatment is stored in an environment with a temperature below 34°C.

[0013] In one embodiment, the manufacturing method further includes peeling and removing the absorbent film from the intermediate laminate after storage.

[0014] In one embodiment, the moisture permeability of the aforementioned phase retardation layer at 40°C and 92% RH is 300 g / m³. 2 ·More than 24h.

[0015] In one embodiment, the phase retardation layer is a single layer with a Re(550) of 100 nm to 190 nm, a Re(450) / Re(550) ratio of 0.8 or higher and lower than 1, and an angle of 40° to 50° between the slow axis of the phase retardation layer and the absorption axis of the polarizer. In another embodiment, the polarizer with the phase retardation layer further has another phase retardation layer outside the phase retardation layer, and the refractive index characteristics of the other phase retardation layer show a relationship of nz > nx = ny.

[0016] In one embodiment, the phase difference layer has a stacked structure of an alignment-cured layer of a first liquid crystal compound and an alignment-cured layer of a second liquid crystal compound; the Re(550) of the alignment-cured layer of the first liquid crystal compound is 200 nm to 300 nm, and the angle between its slow axis and the absorption axis of the polarizer is 10° to 20°; the Re(550) of the alignment-cured layer of the second liquid crystal compound is 100 nm to 190 nm, and the angle between its slow axis and the absorption axis of the polarizer is 70° to 80°.

[0017] In one embodiment, the total thickness of the polarizer with the phase difference layer is less than 45 μm.

[0018] Invention Effects

[0019] According to an embodiment of the present invention, in the method for manufacturing a polarizer with a phase retardation layer, by subjecting an intermediate laminate to a predetermined humidification treatment with a predetermined absorbent film temporarily attached thereto, and by storing the humidified intermediate laminate for a predetermined time, a polarizer with a phase retardation layer that suppresses warping can be manufactured easily and effectively. Attached Figure Description

[0020] Figure 1 This is a schematic cross-sectional view showing an example of a polarizer with a phase difference layer obtained by the manufacturing method according to an embodiment of the present invention.

[0021] Figure 2 This is a schematic cross-sectional view showing another example of a polarizer with a phase difference layer obtained by the manufacturing method according to an embodiment of the present invention.

[0022] Figure 3 This is a conceptual diagram illustrating the manufacturing method of an embodiment of the present invention. Detailed Implementation

[0023] The embodiments of the present invention will be described below, but the present invention is not limited to these embodiments.

[0024] (Definitions of terms and symbols)

[0025] The definitions of terms and symbols used in this specification are as follows.

[0026] (1) Refractive index (nx, ny, nz)

[0027] “nx” is the refractive index in the direction where the refractive index is maximum (i.e., the slow axis direction), “ny” is the refractive index in the direction orthogonal to the slow axis (i.e., the fast axis direction), and “nz” is the refractive index in the thickness direction.

[0028] (2) In-plane phase difference (Re)

[0029] “Re(λ)” is the in-plane phase difference measured at 23°C using light with a wavelength of λ nm. For example, “Re(550)” is the in-plane phase difference measured at 23°C using light with a wavelength of 550 nm. When the thickness of the layer (film) is set to d (nm), Re(λ) is obtained using the formula: Re(λ)=(nx-ny)×d.

[0030] (3) Phase difference (Rth) in the thickness direction

[0031] “Rth(λ)” is the phase difference in the thickness direction measured by light with a wavelength of λ nm at 23°C. For example, “Rth(550)” is the phase difference in the thickness direction measured by light with a wavelength of 550 nm at 23°C. When the thickness of the layer (film) is set to d (nm), Rth(λ) is obtained by the formula: Rth(λ)=(nx-nz)×d.

[0032] (4) Nz coefficient

[0033] The Nz coefficient is obtained by Nz = Rth / Re.

[0034] (5) Angle

[0035] When an angle is mentioned in this specification, the angle includes both clockwise and counterclockwise relative to a reference direction. Therefore, for example, "45°" means ±45°.

[0036] A. A schematic diagram of the structure of a polarizer with a phase retardation layer obtained by the manufacturing method according to an embodiment of the present invention.

[0037] Figure 1 This is a schematic cross-sectional view showing an example of a polarizer with a phase retardation layer obtained by the manufacturing method according to an embodiment of the present invention. The polarizer 100 with a phase retardation layer shown in the figure has a polarizer 11, a protective layer 12 disposed on one side of the polarizer 11 (typically the visible side), and a phase retardation layer 20 disposed on the other side of the polarizer 11. That is, the polarizer 100 with a phase retardation layer has the protective layer 12 only on the visible side of the polarizer 11 (the side opposite to the phase retardation layer 20). In such a polarizer with a phase retardation layer, the effects of the embodiments of the present invention (described later) become significant. In practical applications, an adhesive layer (not shown) is provided on the side of the phase retardation layer 20 opposite to the polarizer 11 (i.e., as the outermost layer opposite to the visible side), and the polarizer with a phase retardation layer is made to be attached to an image display panel. Furthermore, a release film (not shown) is preferably temporarily attached to the surface of the adhesive layer before the polarizer with a phase retardation layer is supplied for use. By temporarily attaching a release film, the adhesive layer can be protected, and a roll of polarizer with a phase retardation layer can be formed. It should be noted that in this specification, the laminate of the polarizer and the protective layer is sometimes referred to as a polarizer.

[0038] In an embodiment of the present invention, the moisture permeability (hereinafter referred to as moisture permeability) of the protective layer 12 at 40°C and 92% RH is 100 g / m³. 2 • Less than 24 hours. In polarizers with a phase retardation layer that have a protective layer with such moisture permeability only on one side of the polarizer, the effects of the embodiments of the present invention (described later) become significant. The moisture permeability of the protective layer is preferably 80 g / m³. 2• Less than 24 hours, preferably 60g / m 2 • Less than 24 hours. The lower limit of moisture permeability can be, for example, 5 g / m³. 2 ·24h.

[0039] In an embodiment of the present invention, the retardation layer 20 is an alignment-cured layer of a liquid crystal compound (liquid crystal alignment-cured layer). By using a liquid crystal compound, the difference between nx and ny of the resulting retardation layer can be significantly increased compared to non-liquid crystal materials, thus significantly reducing the thickness of the retardation layer used to obtain the desired in-plane retardation. Therefore, a significant reduction in the thinness of the polarizer with the retardation layer can be achieved. In such a polarizer with a retardation layer, the effects of the embodiments of the present invention (described later) become significant. In this specification, "alignment-cured layer" refers to a layer in which the liquid crystal compound is aligned in a predetermined direction and its alignment state is fixed. It should be noted that "alignment-cured layer" includes the concept of an alignment-cured layer obtained by curing liquid crystal monomers as described later. In the retardation layer 20, typically, rod-shaped liquid crystal compounds are aligned in a state of alignment along the slow axis direction of the retardation layer (parallel alignment). The retardation layer 20 can be as follows: Figure 1 It can be a single layer as shown, or it can be as follows: Figure 2 It has a stacked structure with two or more layers, as shown in the diagram.

[0040] The optimal moisture permeability of the phase difference layer is 300 g / m³. 2 • More than 24 hours, preferably 300g / m 2 ·24h~1000g / m 2 • 24h, further preferably 400g / m 2 ·24h~800g / m 2 • 24h. The moisture permeability difference between the protective layer and the phase retardation layer is preferably 200 g / m². 2 • More than 24 hours, preferably 250g / m 2 ·24h~750g / m 2 ·24h.

[0041] The total thickness of the polarizer with a phase retardation layer (the combined thickness of the polarizer, protective layer, phase retardation layer, and the adhesive layer that layers them) is preferably 45 μm or less, more preferably 40 μm or less, and even more preferably 35 μm or less. The total thickness of the polarizer with a phase retardation layer can, for example, be 25 μm or more. Furthermore, in the polarizer with a phase retardation layer, the ratio of the thickness of the polarizer (polarizer and protective layer) to the thickness of the phase retardation layer (polarizer / phase retardation layer: hereinafter sometimes simply referred to as "thickness ratio") is preferably 5 or more, more preferably 5 to 16, and even more preferably 5 to 14. This thickness ratio can be achieved by having a protective layer only on one side of the polarizer, the phase retardation layer being an alignment and curing layer of the liquid crystal compound, and the polarizer being thin as described later.

[0042] The polarizer with a phase retardation layer can further include other optical functional layers. The type, characteristics, number, combination, and arrangement of the optical functional layers that can be disposed on the polarizer with a phase retardation layer can be appropriately set according to the purpose. For example, the polarizer with a phase retardation layer can also further have a conductive layer or an isotropic substrate with a conductive layer (neither shown). The conductive layer or isotropic substrate with a conductive layer is typically disposed on the outside of the phase retardation layer 20 (on the opposite side of the polarizer 10). The conductive layer or isotropic substrate with a conductive layer is typically any layer disposed as needed, and can also be omitted. It should be noted that when a conductive layer or isotropic substrate with a conductive layer is provided, the polarizer with a phase retardation layer can be applied to a so-called embedded touch panel type input display device in which a touch sensor is incorporated between an image display unit (e.g., an organic EL unit) and the polarizer. Furthermore, the polarizer with a phase retardation layer can further include other phase retardation layers. The optical characteristics (e.g., refractive index characteristics, in-plane phase retardation, Nz coefficient, photoelastic coefficient), thickness, and arrangement of the other phase retardation layers can be appropriately set according to the purpose. Furthermore / or, a layer that improves visibility when viewed through polarized sunglasses (typically, a λ / 4 plate with (elliptical) polarization function, or an ultra-high phase difference layer) can be provided on the surface of the protective layer 12 as needed. By making such a configuration, excellent visibility can be achieved even when the displayed image is viewed through polarized lenses such as polarized sunglasses. Therefore, polarizers with phase difference layers are also suitable for use in image display devices that can be used outdoors.

[0043] Hereinafter, a method for manufacturing a polarizer with a phase retardation layer as described above according to an embodiment of the present invention will be described, and then the constituent elements of the polarizer with a phase retardation layer will be described.

[0044] B. Manufacturing method of polarizer with phase retardation layer

[0045] The manufacturing method of the polarizer with a phase retardation layer according to an embodiment of the present invention includes: humidifying an intermediate laminate to which an absorbent film is temporarily attached temporarily on the phase retardation layer side of the polarizer with the phase retardation layer while rolling it; and storing the humidified intermediate laminate for at least 12 hours. Hereinafter, each step in the manufacturing method of the polarizer with a phase retardation layer will be described sequentially.

[0046] B-1. Fabrication of Polarizing Films

[0047] Polarizers can be manufactured by any suitable method. Specifically, a polarizer can include a polarizer made of a single layer of resin film, or it can include a polarizer made of two or more layers of laminate.

[0048] B-1-1. Fabrication of a polarizer using a single-layer resin film.

[0049] A typical method for manufacturing a polarizer from a single-layer resin film includes dyeing and stretching the resin film using dichroic substances such as iodine or dichroic dyes. Examples of resin films include hydrophilic polymer films such as polyvinyl alcohol (PVA) films, partially methyl acetalized PVA films, and partially saponified ethylene-vinyl acetate copolymer films. The method may further include insolubility treatment, swelling treatment, and crosslinking treatment. By laminating a protective layer (protective film) on at least one side of the obtained polarizer, a polarizer can be obtained. Since such manufacturing methods are well-known and commonly used in the art, detailed descriptions are omitted.

[0050] B-1-2. Fabrication of a polarizer using a laminated structure

[0051] When a laminate is used in the manufacture of a polarizer, the laminate can be a resin substrate and a PVA-based resin layer (PVA-based resin film) laminated on the resin substrate, or it can be a resin substrate and a PVA-based resin layer coated on the resin substrate. As an example, a method for manufacturing a polarizer using a laminate of a resin substrate and a PVA-based resin layer coated on the resin substrate will be described. This manufacturing method typically includes: coating a PVA-based resin solution onto a resin substrate and drying it to form a PVA-based resin layer on the resin substrate, obtaining a laminate of the resin substrate and the PVA-based resin layer; stretching and dyeing the laminate to form a polarizer from the PVA-based resin layer. In such a manufacturing method, it is preferable to form a polyvinyl alcohol-based resin layer comprising a halide and a polyvinyl alcohol-based resin on one side of the resin substrate. Stretching typically includes immersing the laminate in an aqueous boric acid solution and then stretching it. Furthermore, stretching may, if necessary, further include air stretching of the laminate at a high temperature (e.g., above 95°C) before stretching in the aqueous boric acid solution. Furthermore, in this manufacturing method, the laminate is preferably subjected to a drying shrinkage treatment that shrinks by more than 2% in the width direction by heating while being conveyed along the length direction. Typically, this manufacturing method includes sequentially performing an air-assisted stretching treatment, a dyeing treatment, an underwater stretching treatment, and a drying shrinkage treatment on the laminate. By introducing assisted stretching, even when PVA is coated on a thermoplastic resin, the crystallinity of PVA can be improved, resulting in high optical properties. Furthermore, by simultaneously improving the orientation of PVA beforehand, problems such as decreased orientation and dissolution of PVA can be prevented when immersed in water during subsequent dyeing and stretching processes, thus achieving high optical properties. Moreover, when the PVA-based resin layer is immersed in a liquid, compared to when the PVA-based resin layer does not contain halides, the disorder of polyvinyl alcohol molecule orientation and the reduction of orientation can be suppressed. Therefore, the optical properties of the polarizer obtained by immersing the laminate in a liquid through dyeing and underwater stretching treatments can be improved. Furthermore, by using the drying shrinkage treatment to shrink the laminate along the width direction, optical properties can be improved. The resulting resin substrate / polarizer laminate can be used directly (i.e., the resin substrate can be used as a protective layer for the polarizer), or the resin substrate can be peeled off from the resin substrate / polarizer laminate, and any suitable protective layer corresponding to the purpose can be laminated on the peeled surface for use. Detailed descriptions of such a polarizer manufacturing method are described, for example, in Japanese Patent Application Publication No. 2012-73580 and Japanese Patent No. 6470455. The entire descriptions of these publications are incorporated herein by reference.

[0052] B-2. Formation of the phase difference layer

[0053] A simplified explanation of the method for forming a phase retardation layer (liquid crystal alignment curing layer) is provided. The liquid crystal alignment curing layer is formed by performing an alignment treatment on the surface of a specified substrate, coating the surface with a coating liquid containing a liquid crystal compound to align the liquid crystal compound in a direction corresponding to the alignment treatment, and then fixing this alignment state. Any suitable alignment treatment can be used. Specifically, mechanical alignment treatment, physical alignment treatment, and chemical alignment treatment can be listed. Specific examples of mechanical alignment treatment include friction treatment and stretching treatment. Specific examples of physical alignment treatment include magnetic field alignment treatment and electric field alignment treatment. Specific examples of chemical alignment treatment include oblique evaporation and photo-alignment treatment. The processing conditions for each alignment treatment can be any suitable condition depending on the purpose.

[0054] The orientation of the liquid crystal compound is achieved by treating it at a temperature that displays a liquid crystal phase, depending on the type of liquid crystal compound. Through this temperature treatment, the liquid crystal compound takes on a liquid crystal state and is oriented according to the orientation treatment direction of the substrate surface.

[0055] In one embodiment, the orientation state is fixed by cooling the liquid crystal compound oriented as described above. When the liquid crystal compound is a polymerizable monomer or a crosslinking monomer, the orientation state is fixed by performing a polymerization or crosslinking treatment on the liquid crystal compound oriented as described above.

[0056] Specific examples of liquid crystal compounds and details of methods for forming alignment curing layers are described in Japanese Patent Application Publication No. 2006-163343. The contents of that publication are incorporated herein by reference.

[0057] Perform the above steps to form a liquid crystal alignment and curing layer on the substrate.

[0058] B-3. ​​Fabrication of a polarizer with a phase retardation layer

[0059] By stacking the polarizer obtained above with the retardation layer, a polarizer with a retardation layer can be obtained. Typically, the stacking of the polarizer and the retardation layer is performed while they are being rolled (i.e., by so-called roll-to-roll). Typically, the stacking can be performed by transferring a liquid crystal alignment curing layer formed on a substrate. When the retardation layer has a stacked structure, each retardation layer can be sequentially stacked (transferred) onto the polarizer, or the stack of retardation layers can be stacked (transferred) onto the polarizer. Typically, the transfer is performed using an active energy radiation-curing adhesive. The cured thickness of the active energy radiation-curing adhesive is preferably 0.4 μm or more, more preferably 0.4 μm to 3.0 μm, and even more preferably 0.6 μm to 1.5 μm.

[0060] In cases where a polarizer with a phase retardation layer further includes other optical functional layers (e.g., conductive layers, other phase retardation layers), these optical functional layers can be stacked or formed in a specified configuration position by any suitable method.

[0061] The fabrication (lamination) of a polarizer with a phase retardation layer is representative of a polarizer with a water vapor content of 11.5 g / m. 3 The following conditions must be met. The water vapor content in the stack is preferably 6.0 g / m³. 3 ~11.5g / m 3 More preferably 8.0 g / m 3 ~11.5g / m 3 By performing the layering process in an environment with a water vapor content within this range, the effects of the humidification treatment described later become significant. Such a water vapor content in the layering can be achieved, for example, by varying the relative humidity in accordance with the temperature within a range of 18°C ​​to 25°C. For example, at a temperature of 18°C, the water vapor content can be achieved by setting the relative humidity to 65%RH or lower; furthermore, for example, at a temperature of 20°C, it can be achieved by setting the relative humidity to 55%RH or lower; and furthermore, for example, at a temperature of 23°C, it can be achieved by setting the relative humidity to 45%RH or lower. It should be noted that the lower limit of the relative humidity can be, for example, 30%RH.

[0062] B-4. Fabrication of intermediate laminates

[0063] Next, as Figure 3 As shown, a water-absorbing film 150 is temporarily attached to the phase retardation layer side of the polarizer obtained above, thus fabricating an intermediate laminate 200. The intermediate laminate is fabricated using roll-to-roll assembly, similar to the method described above. It should be noted that the polarizer with the phase retardation layer during the fabrication of the intermediate laminate has the same layer composition as the final polarizer with the phase retardation layer, but it is essentially an intermediate. Therefore, in... Figure 3 In the middle, the symbol 100' is used to represent the same as Figure 1 The intermediate corresponding to the polarizer 100 with the phase difference layer is denoted by the symbol 101'. Figure 2 The intermediate corresponding to the polarizer 101 with phase difference layer.

[0064] The water absorption rate of the absorbent membrane is preferably 2% or more, more preferably 2% to 20%, and even more preferably 2% to 10%. If the water absorption rate of the absorbent membrane is within such a range, the amount of water reaching the polarizer can be adjusted to a suitable range through humidification treatment and subsequent storage (both described later). More specifically, the absorbent membrane absorbs a suitable amount of water through humidification treatment and maintains a predetermined amount of absorbed water. The water retained in the absorbent membrane can be transferred to the polarizer during storage. Therefore, by appropriately setting the humidification treatment conditions to adjust the amount of water absorbed and retained in the absorbent membrane, and appropriately adjusting the storage conditions to adjust the amount of water transferred from the absorbent membrane to the polarizer, the amount of water in the polarizer can be set to a suitable range. As a result, warping of the polarizer with the phase retardation layer can be significantly suppressed. If the water absorption rate is too low, the suppression of warping may sometimes be insufficient. If the water absorption rate is too high, warping may sometimes occur in the opposite direction and / or in a direction orthogonal to the initial direction within the plane. More specifically, without humidification, the polarizer with a retardation layer typically exhibits convex warping on the protective layer side. Conversely, by humidification, convex warping occurs on the retardation layer side. As a result, warping in opposite directions is canceled out, thus suppressing warping in the resulting polarizer with a retardation layer. Therefore, if the water absorption rate is too high, the convex warping on the retardation layer side becomes excessive, resulting in warping in the opposite direction (convex on the protective layer side) and / or in-plane warping orthogonal to the initial direction in the resulting polarizer with a retardation layer.

[0065] The absorbent membrane can be made of any suitable material as long as it has the desired absorbency rate described above. Examples of materials constituting the absorbent membrane include triacetyl cellulose (TAC) and acrylic resins. TAC is preferred.

[0066] The thickness of the absorbent membrane is preferably 40 μm or more, more preferably 60 μm or more, and even more preferably 70 μm or more. The upper limit of the absorbent membrane thickness can be, for example, 200 μm. If the absorbent membrane thickness is within such a range, through the synergistic effect of setting the water absorption rate within a specified range, the amount of water reaching the polarizer can be adjusted to a suitable range during humidification treatment. Therefore, by storing the polarizer after humidification treatment, the amount of water in the polarizer can be set to a suitable range. As a result, warping of the polarizer with the retardation layer can be significantly suppressed.

[0067] The optimal moisture permeability of the absorbent membrane is 300 g / m³. 2 • More than 24 hours, preferably 300g / m 2 ·24h~1000g / m 2 • 24h, further preferably 300g / m 2 ·24h~800g / m2 • 24h. If the moisture permeability of the absorbent membrane is within such a range, a suitable amount of moisture absorbed by the absorbent membrane and retained within it can be transferred to the polarizer through post-humidification storage. Therefore, by storing the polarizer after humidification, the moisture content of the polarizer can be set to a suitable range. As a result, warping of the polarizer with the phase retardation layer can be significantly suppressed.

[0068] The fabrication (lamination) of intermediate laminates can, in a typical sense, be carried out in the same environment as the fabrication (lamination) of polarizers with phase difference layers.

[0069] B-5. Humidification treatment

[0070] The intermediate laminate 200 obtained above is as follows Figure 3 As shown, it is subjected to a humidification process. The humidification process is typically carried out while the intermediate laminate is being rolled. The humidification process is typically performed at a temperature below 34°C and a water vapor content of 13.8 g / m³. 3 The humidification process is carried out under the above conditions. The preferred temperature for humidification is 18℃~34℃. The preferred water vapor concentration for humidification is 13.8g / m³. 3 ~30g / m 3 More preferably 13.8 g / m 3 ~24g / m 3 The amount of water vapor required for humidification can be achieved, for example, at a temperature of 20°C by setting the relative humidity to 80% RH or higher; furthermore, at a temperature of 23°C, by setting the relative humidity to 70% RH or higher; furthermore, at a temperature of 25°C, by setting the relative humidity to 60% RH or higher; and furthermore, at a temperature of 28°C, by setting the relative humidity to greater than 50% RH. It should be noted that the upper limit of relative humidity can be, for example, 100% RH. By performing humidification under such conditions, a suitable amount of moisture can be imparted to the polarizer with the retardation layer, and through the synergistic effect with the effect of temporarily attaching a water-absorbing film, warping of the polarizer with the retardation layer can be suppressed.

[0071] The humidification time in the humidification process is preferably 5 minutes or more, more preferably 5 minutes to 30 minutes, further preferably 5 minutes to 20 minutes, and particularly preferably 5 minutes to 15 minutes. If the humidification time is 5 minutes or more, the desired moisture absorption rate can be achieved. Even if the humidification time becomes too long, the effect will not change, so the upper limit of the humidification time can be determined by the balance between the desired moisture absorption rate and the manufacturing efficiency.

[0072] The humidification process is performed by increasing the weight per unit volume of the polarizer with the retardation layer by, for example, 0.2% or more. The weight increase per unit volume of the polarizer with the retardation layer during humidification is preferably 0.2% to 2.5%, more preferably 0.3% to 2.0%, and even more preferably 0.3% to 1.0%. This weight increase during humidification means that the polarizer with the retardation layer has absorbed moisture; therefore, by setting the weight increase within this range, the polarizer can absorb the desired amount of moisture. As a result, warping of the polarizer with the retardation layer can be suppressed.

[0073] B-6. Storage

[0074] Humidified intermediate laminates such as Figure 3 The intermediate laminate is stored as shown. Typically, the intermediate laminate is wound into a roll and stored in a rolled state. This storage allows for the efficient transfer of moisture imparted to the intermediate laminate (essentially a water-absorbing film) through humidification treatment to the polarizer. This increases the moisture content of the polarizer, resulting in suppression of warping of the polarizer with the phase retardation layer. The storage time, as described above, is 12 hours or more, preferably 16 hours or more, more preferably 24 hours or more, and even more preferably 30 hours or more. Even if the storage time is excessively long, the effect will not change; therefore, the upper limit of the storage time is determined by the balance between the desired moisture absorption and manufacturing efficiency.

[0075] Storage can typically be performed near room temperature. The storage temperature is typically below 34°C, preferably below 30°C, more preferably 20°C to 30°C, and even more preferably 23°C to 27°C. If the storage temperature is too high, the moisture imparted (absorbed) to the polarizer with the phase retardation layer by humidification treatment may evaporate to the outside and not be well transferred to the polarizer.

[0076] For example, the storage condition is characterized by a water vapor content of 11.5 g / m³. 3 The following conditions must be met. In other words, storage must be carried out without substantially humidifying the intermediate laminates. By storing under these conditions, moisture can be effectively transferred from the absorbent membrane to the polarizer.

[0077] After storage, the absorbent membrane, such as Figure 3 As shown, it is peeled off from the intermediate laminate. By operating in this way, a polarizer with a phase retardation layer can be obtained.

[0078] C. Polarizing plate

[0079] C-1. Polarizer

[0080] As indicated by the manufacturing method described above, the polarizer 11 is typically a resin film containing a dichroic substance (e.g., iodine). As mentioned above, examples of resin films include hydrophilic polymer films such as polyvinyl alcohol (PVA) films, partially methyl acetalized PVA films, and partially saponified ethylene-vinyl acetate copolymer films.

[0081] The thickness of the polarizer is preferably 15 μm or less, more preferably 1 μm to 12 μm, and even more preferably 3 μm to 12 μm. If the thickness of the polarizer is within this range, the desired amount of moisture can be absorbed well by the humidification treatment described above.

[0082] The polarizer preferably exhibits absorption dichroism at any wavelength from 380 nm to 780 nm. The transmittance of the polarizer is, for example, 41.5% to 46.0%, preferably 42.0% to 46.0%, and even more preferably 44.5% to 46.0%. The polarization degree of the polarizer is preferably 97.0% or more, more preferably 99.0% or more, and even more preferably 99.9% or more.

[0083] C-2. Protective layer

[0084] The protective layer 12, as long as it has the aforementioned moisture permeability, can be formed from any suitable film that can be used as a protective layer for a polarizer. Specific examples of materials that are the main components of this film include transparent resins such as polyester, polyvinyl alcohol, polycarbonate, polyamide, polyimide, polyethersulfone, polysulfone, polystyrene, cyclic olefins (e.g., polynorbornene), polyolefins, (meth)acrylic acid, and acetate. Preferably, the protective layer 12 can be composed of a cyclic olefin (e.g., polynorbornene) resin film.

[0085] The polarizer with a phase retardation layer obtained by the manufacturing method according to the embodiments of the present invention is typically disposed on the viewable side of an image display device, and the protective layer 12 is disposed on its viewable side. Therefore, the protective layer 12 may also be subjected to surface treatments such as hard coating, anti-reflection treatment, anti-sticking treatment, and anti-glare treatment as needed.

[0086] The thickness of the protective layer 12 is preferably 5 μm to 80 μm, more preferably 10 μm to 40 μm, and even more preferably 15 μm to 35 μm. It should be noted that, when surface treatment is performed, the thickness of the protective layer 12 includes the thickness of the surface treatment layer.

[0087] D. Phase difference layer

[0088] As described above, the phase difference layer 20 can be a single layer or a stacked structure with two or more layers.

[0089] In the case where the phase retardation layer 20 is a single layer, it can function as a λ / 4 plate in one embodiment. Specifically, the Re(550) of the phase retardation layer is preferably 100 nm to 180 nm, more preferably 110 nm to 170 nm, and even more preferably 110 nm to 160 nm. The thickness of the phase retardation layer can be adjusted to obtain the desired in-plane phase difference of the λ / 4 plate. The thickness of the phase retardation layer can be, for example, 1.0 μm to 2.5 μm. In this embodiment, the angle between the slow axis of the phase retardation layer and the absorption axis of the polarizer is preferably 40° to 50°, more preferably 42° to 48°, and even more preferably 44° to 46°. In the case where the phase retardation layer is a single layer, it preferably exhibits an inverse dispersion wavelength characteristic where the phase difference value increases accordingly with the wavelength of the measurement light. In this embodiment, the polarizer with the phase retardation layer may also have another phase retardation layer (not shown) on the outside of the phase retardation layer 20 (opposite to the polarizer) exhibiting a refractive index characteristic of nz > nx = ny.

[0090] When the phase retardation layer 20 has a stacked structure, the phase retardation layer is representative as follows: Figure 2A two-layer structure having an H layer 21 and a Q layer 22 in this order from the polarizer side as shown. The H layer can function as a λ / 2 plate representatively, and the Q layer can function as a λ / 4 plate representatively. Specifically, Re(550) of the H layer is preferably 200 nm to 300 nm, more preferably 220 nm to 290 nm, and further preferably 230 nm to 280 nm; Re(550) of the Q layer is preferably 100 nm to 180 nm, more preferably 110 nm to 170 nm, and further preferably 110 nm to 150 nm. The thickness of the H layer is adjusted in such a way as to obtain the desired in-plane retardation of the λ / 2 plate. The thickness of the H layer can be, for example, 2.0 μm to 4.0 μm. The thickness of the Q layer is adjusted in such a way as to obtain the desired in-plane retardation of the λ / 4 plate. The thickness of the Q layer can be, for example, 1.0 μm to 2.5 μm. In the present embodiment, the angle formed by the slow axis of the H layer and the absorption axis of the polarizer is preferably 10° to 20°, more preferably 12° to 18°, and further preferably 12° to 16°; the angle formed by the slow axis of the Q layer and the absorption axis of the polarizer is preferably 70° to 80°, more preferably 72° to 78°, and further preferably 72° to 76°. It should be noted that the arrangement order of the H layer and the Q layer can also be reversed, and the angle formed by the slow axis of the H layer and the absorption axis of the polarizer and the angle formed by the slow axis of the Q layer and the absorption axis of the polarizer can also be reversed. In the case where the retardation layer has a laminated structure, each layer (for example, the H layer and the Q layer) can exhibit an inverse dispersion wavelength characteristic in which the retardation value increases corresponding to the wavelength of the measurement light, a positive wavelength dispersion characteristic in which the retardation value decreases corresponding to the wavelength of the measurement light, or a flat wavelength dispersion characteristic in which the retardation value hardly changes according to the wavelength of the measurement light.

[0091] The retardation layer (each layer in the case of having a laminated structure) representatively shows a relationship of nx > ny = nz in refractive index characteristics. It should be noted that "ny = nz" includes not only the case where ny and nz are exactly equal but also the case where they are substantially equal. Therefore, within the range that does not impair the effects of the present invention, it may sometimes be ny > nz or ny < nz. The Nz coefficient of the retardation layer is preferably 0.9 to 1.5, more preferably 0.9 to 1.3.

[0092] The retardation layer is a liquid crystal alignment cured layer as described above. As the liquid crystal compound, for example, a liquid crystal compound having a nematic phase (nematic liquid crystal) can be cited. As such a liquid crystal compound, for example, a liquid crystal polymer and a liquid crystal monomer can be used. The manifestation mechanism of the liquid crystallinity of the liquid crystal compound can be either lyotropic or thermotropic. The liquid crystal polymer and the liquid crystal monomer can be used alone or in combination.

[0093] When the liquid crystal compound is a liquid crystal monomer, the liquid crystal monomer is preferably a polymerizable monomer or a crosslinking monomer. This is because by polymerizing or crosslinking the liquid crystal monomer (i.e., curing), the orientation state of the liquid crystal monomer can be fixed. After oriented, the orientation state can be fixed simply by polymerizing or crosslinking the liquid crystal monomers together. Here, polymers are formed through polymerization, and three-dimensional mesh structures are formed through crosslinking, but these are non-liquid crystals. Therefore, the resulting retardation layer does not, for example, cause the temperature-induced phase transitions characteristic of liquid crystal compounds to liquid crystal phases, glassy phases, or crystalline phases. As a result, the retardation layer becomes a retardation layer with extremely excellent stability, unaffected by temperature changes.

[0094] The temperature range in which liquid crystal monomers exhibit liquid crystal properties varies depending on the type. Specifically, this temperature range is preferably 40°C to 120°C, more preferably 50°C to 100°C, and most preferably 60°C to 90°C.

[0095] Any suitable liquid crystal monomer can be used as the liquid crystal monomer. For example, polymerizable mesocrystalline compounds described in Japanese Patent Application Publication No. 2002-533742 (WO00 / 37585), EP358208 (US5211877), EP66137 (US4388453), WO93 / 22397, EP0261712, DE19504224, DE4408171, and GB2280445 can be used. Specific examples of such polymerizable mesocrystalline compounds include BASF's trade name LC242, Merck's trade name E7, and Wacker-Chem's trade name LC-Sillicon-CC3767. Nematic liquid crystal monomers are preferred, for example.

[0096] Example

[0097] The present invention will now be specifically described through examples, but the present invention is not limited to these examples. The methods for measuring each characteristic are described below. It should be noted that, unless otherwise specified, "parts" and "%" in the examples and comparative examples are based on weight.

[0098] (1) Warping

[0099] The polarizers with phase retardation layers obtained in the examples and comparative examples were cut into 140mm × 70mm sizes before humidification (before intermediate laminate fabrication) and after humidification and storage (after TAC film peeling). In this case, the polarizer's absorption axis was aligned with the long side. When the cut polarizers with phase retardation layers were placed on a flat surface, the height of the highest point from that surface was set as the warpage.

[0100] Next, the warpage of the polarizer with phase retardation layer cut out after storage was measured in the same manner as above, and the changes in warpage before humidification and after humidification-storage were evaluated according to the following criteria.

[0101] ○: The change in warpage is less than ±25mm.

[0102] ×: Change in warpage greater than ±25mm

[0103] It should be noted that the case of warping bulging towards the stationary surface is represented by "positive (+)", and the case of warping towards the opposite side of the stationary surface is represented by "negative (-)". In addition, the stationary surface side is the phase difference layer (Q layer) side.

[0104] [Example 1]

[0105] 1. Fabrication of polarizers

[0106] As a thermoplastic resin substrate, an amorphous polyethylene terephthalate copolymer film (thickness: 100μm) with a strip shape and a Tg of about 75℃ isophthalic acid copolymer is used to perform corona treatment on one side of the resin substrate.

[0107] 13 parts by weight of potassium iodide were added to 100 parts by weight of a PVA-based resin prepared by mixing polyvinyl alcohol (degree of polymerization 4200, degree of saponification 99.2 mol%) and acetoacetyl modified PVA (manufactured by Japan Synthetic Chemical Industry Co., Ltd., trade name "GOHSEFIMER") in a ratio of 9:1. The resulting substance was dissolved in water to prepare a PVA aqueous solution (coating solution).

[0108] A laminate was fabricated by coating the above-mentioned PVA aqueous solution onto the corona-treated surface of a resin substrate and drying it at 60°C to form a PVA-based resin layer with a thickness of 13 μm.

[0109] The resulting laminate was stretched uniaxially to 2.4 times its original length in an oven at 130°C (air-assisted stretching treatment).

[0110] Next, the laminate was immersed in an insoluble bath (an aqueous solution of boric acid prepared by mixing 4 parts by weight of boric acid with 100 parts by weight of water) at a liquid temperature of 40°C for 30 seconds (insoluble treatment).

[0111] Next, the polarizer is immersed in a staining bath at 30°C (an aqueous solution of iodine and potassium iodide prepared by mixing iodine and potassium iodide in a weight ratio of 1:7 relative to 100 parts by weight of water) for 60 seconds (staining treatment), adjusting the concentration so that the final polarizer's monomer transmittance (Ts) becomes the desired value.

[0112] Next, immerse the sample in a crosslinking bath at 40°C (an aqueous solution of boric acid prepared by mixing 3 parts by weight of potassium iodide and 5 parts by weight of boric acid with 100 parts by weight of water) for 30 seconds (crosslinking treatment).

[0113] Subsequently, the laminate was immersed in a boric acid aqueous solution (boric acid concentration of 4% by weight and potassium iodide concentration of 5% by weight) at a liquid temperature of 70°C, while being uniaxially stretched (underwater stretching treatment) between rollers with different circumferential speeds along the longitudinal direction (length direction) with a total stretching ratio of 5.5.

[0114] The laminate was then immersed in a washing bath at 20°C (an aqueous solution of 4 parts by weight of potassium iodide relative to 100 parts by weight of water) for washing treatment.

[0115] Then, while drying in an oven maintained at approximately 90°C, it comes into contact with SUS heated rollers with a surface temperature maintained at approximately 75°C (drying shrinkage treatment).

[0116] By operating in this way, a polarizer with a thickness of about 5 μm is formed on the resin substrate, resulting in a polarizer with a resin substrate / polarizer configuration.

[0117] Furthermore, an HC-COP film is bonded as a visible-side protective layer to the surface of the obtained polarizer (the side opposite to the resin substrate) using a UV-curable adhesive. It should be noted that the HC-COP film is a film with an HC layer (2μm thick) formed on a cyclic olefin resin (COP) film (25μm thick), and the COP film is bonded so that it forms the polarizer side. Next, the resin substrate is peeled off to obtain a polarizer consisting of an HC-COP film (visible-side protective layer) and a polarizer. The moisture permeability of the visible-side protective layer is 100 g / m². 2 ·24h.

[0118] 2. Fabrication of polarizers with phase retardation layers

[0119] 2-1. Fabrication of the phase difference layer

[0120] A liquid crystal composition (coating solution) was prepared by dissolving 10g of a polymerizable liquid crystal (manufactured by BASF: trade name "Paliocolor LC242", denoted by the following formula) exhibiting a nematic liquid crystal phase and 3g of a photopolymerization initiator for the polymerizable liquid crystal compound (manufactured by BASF: trade name "Irgacure 907") in 40g of toluene.

[0121] [Chemical Formula 1]

[0122]

[0123] An orientation treatment was performed by rubbing the surface of a polyethylene terephthalate (PET) film (38 μm thick) with a rubbing cloth. The orientation direction was set so that when the film was attached to a polarizer, it was at a 15° angle relative to the absorption axis of the polarizer when viewed from the visible side. The aforementioned liquid crystal coating liquid was then applied to the orientation-treated surface using a bar coater, and the surface was heated and dried at 90°C for 2 minutes to orient the liquid crystal compound. The liquid crystal layer formed in this manner was then irradiated with a metal halide lamp at 1 mJ / cm². 2 The light is used to harden the liquid crystal layer, thereby forming a liquid crystal alignment and curing layer A on the PET film. The thickness of the liquid crystal alignment and curing layer A is 2.0 μm, and the in-plane phase difference Re(550) is 270 nm. Furthermore, the liquid crystal alignment and curing layer A exhibits refractive index characteristics of nx > ny = nz. The liquid crystal alignment and curing layer A is used as the H layer.

[0124] Except for changing the coating thickness and setting the alignment direction to 75° relative to the absorption axis of the polarizer when viewed from the visible side, the same procedure was followed to form a liquid crystal alignment curing layer B on the PET film. The thickness of the liquid crystal alignment curing layer B is 1.0 μm, and the in-plane phase difference Re(550) is 140 nm. Furthermore, the liquid crystal alignment curing layer B exhibits refractive index characteristics of nx > ny = nz. The liquid crystal alignment curing layer B is used as the Q layer.

[0125] 2-2. Fabrication of a polarizer with a phase retardation layer

[0126] The polarizer surface of the polarizer obtained in step 1 above is sequentially transferred with the liquid crystal alignment curing layer A (H layer) and the liquid crystal alignment curing layer B (Q layer) obtained in step 2-1 above. At this time, the transfer (bonding) is performed with the angle between the absorption axis of the polarizer and the slow axis of alignment curing layer A being 15° and the angle between the absorption axis of the polarizer and the slow axis of alignment curing layer B being 75°. It should be noted that each transfer (bonding) is performed using a UV-curable adhesive (1.0 μm thick). By operating in this way, a polarizer with a phase retardation layer is obtained, consisting of a protective layer / adhesive / polarizer / adhesive / phase retardation layer (H layer) / adhesive / phase retardation layer (Q layer). The total thickness of the polarizer with the phase retardation layer is 38 μm. It should be noted that the transfer (bonding) is performed while the polarizer is being rolled.

[0127] 3. Fabrication of intermediate layers

[0128] On the surface of the Q layer of the polarizer with a phase retardation layer obtained in step 2 above, a TAC film (70 μm thick) is temporarily bonded using an acrylic adhesive to create an intermediate laminate. The intermediate laminate is fabricated while being conveyed by rollers. The TAC film has a water absorption rate of 5% and a moisture permeability of 400 g / m³. 2 ·24h.

[0129] 4. Humidification treatment and storage

[0130] The intermediate laminate obtained in step 3 above is simultaneously conveyed by rollers and subjected to humidification treatment. The humidification treatment is carried out at 23°C and 70% RH (water vapor content of 14.4 g / m³). 3 The process is repeated for 10 minutes. The humidified polarizer with a phase retardation layer is then wound into a roll and heated at 23°C and 55% RH (water vapor concentration of 11.3 g / m³). 3 The polarizers with phase difference layers were stored for 24 hours. The polarizers before and after humidification were used for the evaluation of (1) above. The results are shown in Table 1.

[0131] [Example 2]

[0132] In addition to humidification treatment at 20℃ and 80% RH (water vapor rate of 13.8 / m³), 3 After 10 minutes, the process was repeated in the same manner as in Example 1 to obtain a polarizer with a phase retardation layer. The polarizers with the phase retardation layer before and after humidification and storage were subjected to the same evaluation as in Example 1. The results are shown in Table 1.

[0133] [Comparative Example 1]

[0134] Except for humidification and winding storage without adhering to the TAC film, the same procedure as in Example 1 was followed to obtain a polarizer with a phase retardation layer. The polarizers with the phase retardation layer before and after humidification were subjected to the same evaluation as in Example 1. The results are shown in Table 1.

[0135] [Comparative Example 2]

[0136] A polarizer with a phase retardation layer (the polarizer before the intermediate laminate was fabricated) was obtained by operating in the same manner as in Example 1. This polarizer with a phase retardation layer was then directly (i.e., without fabricating an intermediate laminate or subjecting it to humidification) rolled up and stored in the same manner as in Example 1. The rolled-up polarizers with phase retardation layers were then subjected to the same evaluation as in Example 1. The results are shown in Table 1.

[0137] [Reference Example 1]

[0138] A long roll of PVA-based resin film with a thickness of 30 μm was uniaxially stretched along its length using a roll stretching machine at a total stretch ratio of 6.0. Simultaneously, swelling, dyeing, crosslinking, and washing processes were performed, followed by drying to fabricate a polarizer with a thickness of 12 μm. An HC-COP film was then bonded to one side of the resulting polarizer as a visible protective layer, similar to the process in Example 1. Furthermore, a TAC film (25 μm thick) was bonded to the other side of the polarizer using a PVA-based adhesive, resulting in a polarizer with a protective layer (HC-COP film), a polarizer, and a protective layer (TAC film). The following steps were performed in the same manner as in Example 1 to obtain a polarizer with a phase retardation layer, consisting of a protective layer (HC-COP film), an adhesive, a polarizer, an adhesive, a protective layer (TAC film), an adhesive, a phase retardation layer (H layer), and an adhesive, a phase retardation layer (Q layer). The total thickness of the polarizer with the phase retardation layer is 71 μm.

[0139] The intermediate laminate was fabricated using the same steps as in Example 1. After humidification, the intermediate laminate was rolled and stored. The polarizer with the phase retardation layer before and after humidification was evaluated in the same manner as in Example 1. The results are shown in Table 1.

[0140] Table 1

[0141]

[0142] [evaluate]

[0143] As shown in Table 1, it is known that the polarizer with a phase retardation layer obtained by the embodiments of the present invention can suppress warping by subjecting the intermediate laminate with the water-absorbing film to a prescribed humidification treatment and roll storage. Furthermore, as shown in the reference examples, it is known that such warping is a problem specific to polarizers with a phase retardation layer that have a thin total thickness and a visible side protective layer with low moisture permeability.

[0144] Industrial availability

[0145] The polarizer with a phase retardation layer obtained by the manufacturing method according to the embodiments of the present invention can be used as a polarizer with a phase retardation layer for image display devices, and is particularly suitable for flexible, bendable, foldable, or rollable image display devices (such image display devices typically use a resin substrate as the substrate). Examples of image display devices include liquid crystal display devices, organic EL display devices, and inorganic EL display devices.

[0146] Explanation of symbols

[0147] 11 polarizer

[0148] 12 protective layers

[0149] 20 phase difference layers

[0150] 21 phase difference layers (H layer)

[0151] 22 phase difference layers (Q layers)

[0152] 100 polarizers with phase retardation layer

[0153] 100' Polarizer with Phase Difference Layer (Intermediate)

[0154] 101 Polarizer with Phase Difference Layer

[0155] 101' Polarizer with Phase Difference Layer (Intermediate)

[0156] 150 absorbent membrane

[0157] 200 intermediate laminates

Claims

1. A method for manufacturing a polarizer with a phase retardation layer, comprising: a polarizer, a protective layer disposed on one side of the polarizer, and a phase retardation layer disposed on the other side of the polarizer; the method further comprising: While the intermediate laminate, to which a water-absorbing film is temporarily attached, is conveyed by rollers, it is humidified. The intermediate laminate that has undergone this humidification treatment is stored for more than 12 hours without substantial humidification. The moisture permeability of this protective layer at 40℃ and 92%RH is 100g / m³. 2 Less than 24 hours The phase difference layer is an orientation-cured layer of the liquid crystal compound.

2. The method for manufacturing a polarizer with a phase retardation layer according to claim 1, wherein, The absorbent membrane has a water absorption rate of 2% or more.

3. The method for manufacturing a polarizer with a phase retardation layer according to claim 2, wherein, The absorbent membrane is a triacetyl cellulose membrane.

4. The method for manufacturing a polarizer with a phase retardation layer according to claim 3, wherein, The thickness of the absorbent membrane is 40 μm or more.

5. The method for manufacturing a polarizer with a phase retardation layer according to claim 4, wherein, The absorbent membrane has a moisture permeability of 300 g / m³ at 40°C and 92% RH. 2 ·More than 24h.

6. A method for manufacturing a polarizer with a phase retardation layer according to any one of claims 1 to 5, wherein, The humidification process is carried out at a temperature below 34°C and a water vapor concentration of 13.8 g / m³. 3 This will be carried out under the above conditions.

7. The method for manufacturing a polarizer with a phase retardation layer according to claim 6, wherein, The humidification time in the humidification process is more than 5 minutes.

8. A method for manufacturing a polarizer with a phase retardation layer according to any one of claims 1 to 5, wherein, The intermediate laminate treated with the humidification process should be stored for more than 24 hours.

9. A method for manufacturing a polarizer with a phase retardation layer according to any one of claims 1 to 5, wherein, The intermediate laminates subjected to the humidification treatment are stored in an environment with a temperature below 34°C.

10. A method for manufacturing a polarizer with a phase difference layer according to any one of claims 1 to 5, further comprising peeling off the absorbent film from the intermediate laminate after storage.

11. A method for manufacturing a polarizer with a phase retardation layer according to any one of claims 1 to 5, wherein, The moisture permeability of the phase difference layer at 40℃ and 92%RH is 300g / m³. 2 ·More than 24h.

12. A method for manufacturing a polarizer with a phase retardation layer according to any one of claims 1 to 5, wherein, The phase difference layer is a single layer, the Re(550) of the phase difference layer is 100nm~190nm, the Re(450) / Re(550) of the phase difference layer is greater than 0.8 and less than 1, and the angle between the slow axis of the phase difference layer and the absorption axis of the polarizer is 40°~50°.

13. The method for manufacturing a polarizer with a phase retardation layer according to claim 12, wherein, The polarizer with the phase retardation layer has another phase retardation layer outside the phase retardation layer, and the refractive index characteristics of the other phase retardation layer show the relationship nz>nx=ny.

14. A method for manufacturing a polarizer with a phase retardation layer according to any one of claims 1 to 5, wherein, The phase retardation layer has a stacked structure of an alignment-cured layer of a first liquid crystal compound and an alignment-cured layer of a second liquid crystal compound. The Re(550) of the orientation-cured layer of the first liquid crystal compound is 200 nm to 300 nm, and the angle between its slow axis and the absorption axis of the polarizer is 10° to 20°. The Re(550) of the orientation curing layer of the second liquid crystal compound is 100nm to 190nm, and the angle between its slow axis and the absorption axis of the polarizer is 70° to 80°.

15. A method for manufacturing a polarizer with a phase retardation layer according to any one of claims 1 to 5, wherein, The total thickness of the polarizer with the phase difference layer is less than 45 μm.

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