TW202307484A - Manufacturing method for polarizing plate equipped with phase-difference layer and storage method for polarizing plate equipped with phase-difference layer - Google Patents

Manufacturing method for polarizing plate equipped with phase-difference layer and storage method for polarizing plate equipped with phase-difference layer Download PDF

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TW202307484A
TW202307484A TW111112098A TW111112098A TW202307484A TW 202307484 A TW202307484 A TW 202307484A TW 111112098 A TW111112098 A TW 111112098A TW 111112098 A TW111112098 A TW 111112098A TW 202307484 A TW202307484 A TW 202307484A
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polarizing plate
retardation layer
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laminate
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南原拓弥
後藤周作
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日商日東電工股份有限公司
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    • G02—OPTICS
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    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements

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Abstract

The present invention provides a polarizing plate equipped with a phase-difference layer, in which warpage is suppressed. A manufacturing method for a polarizing plate equipped with a phase-difference layer, according to an embodiment of the present invention, comprises: preparing a laminated body that has a polarizing plate including a polarizer having a first principal surface and a second principal surface opposite one another and a first protective layer disposed on the side of the first principal surface of the polarizer, and that has a phase difference layer disposed on the side of the second principal surface of the polarizer; packaging the laminated body in a packaging material having a thermal conductivity of 0.2 W/m.K or less to obtain a packaged body; and storing the packaged body. The difference in moisture permeability at 40 DEG C and 92% RH between the first protective layer and a laminated part from a layer disposed adjacent to the second principal surface of the polarizer to the phase difference layer is 350 g/m2.24h or greater.

Description

附有相位差層之偏光板之製造方法及附有相位差層之偏光板之保管方法Manufacturing method of polarizing plate with retardation layer and storage method of polarizing plate with retardation layer

本發明係關於一種附有相位差層之偏光板之製造方法及附有相位差層之偏光板之保管方法。The present invention relates to a manufacturing method of a polarizing plate with a retardation layer and a storage method for the polarizing plate with a retardation layer.

以液晶顯示裝置及電致發光(EL)顯示裝置(例如，有機EL顯示裝置、無機EL顯示裝置)為代表之圖像顯示裝置急速普及。圖像顯示裝置中代表性的是使用有偏光板及相位差板。實用上而言，廣泛使用將偏光板與相位差板一體化之附有相位差層之偏光板(例如，專利文獻1)。近年來，使用可撓性基板(例如，樹脂基板)來研究圖像顯示裝置之彎曲、屈曲、摺疊、捲取之可能性。作為用於此種圖像顯示裝置之附有相位差層之偏光板，要求薄型之附有相位差層之偏光板。然而，薄型之附有相位差層之偏光板存在容易產生翹曲之問題。該翹曲例如會成為圖像顯示裝置之製造不良之原因。 [先前技術文獻] [專利文獻] Image display devices typified by liquid crystal display devices and electroluminescent (EL) display devices (for example, organic EL display devices, inorganic EL display devices) are rapidly spreading. Typical image display devices use polarizers and retardation plates. Practically speaking, a polarizing plate with a retardation layer in which a polarizing plate and a retardation plate are integrated is widely used (for example, Patent Document 1). In recent years, possibilities of bending, buckling, folding, and winding of image display devices have been studied using flexible substrates (eg, resin substrates). As a polarizing plate with a retardation layer used in such an image display device, a thin polarizing plate with a retardation layer is required. However, the thin polarizer with retardation layer has the problem of warping easily. This warpage causes, for example, a manufacturing failure of an image display device. [Prior Art Literature] [Patent Document]

[專利文獻1]日本專利第3325560號公報[Patent Document 1] Japanese Patent No. 3325560

[發明所欲解決之問題][Problem to be solved by the invention]

本發明係為了解決上述先前之問題而完成者，其主要目的在於提供一種抑制翹曲之附有相位差層之偏光板。 [解決問題之技術手段] The present invention has been made to solve the aforementioned problems, and its main purpose is to provide a polarizing plate with a retardation layer that suppresses warping. [Technical means to solve the problem]

根據本發明之實施方式，提供一種附有相位差層之偏光板之製造方法。該製造方法包含如下步驟：準備具有偏光板及相位差層之積層體，該偏光板包含具有相互對向之第一主面及第二主面之偏光元件與配置於上述偏光元件之上述第一主面側之第一保護層，該相位差層配置於上述偏光元件之上述第二主面側；利用熱導率為0.2 W/m・K以下之捆包材將上述積層體捆包而獲得捆包體；及保管上述捆包體；自與上述偏光元件之上述第二主面鄰接而配置之層至上述相位差層為止之積層部、與上述第一保護層之在40℃及92%RH時之透濕度之差為350 g/m 2・24 h以上。 於1個實施方式中，上述第一保護層之在40℃及92%RH時之透濕度為100 g/m 2・24 h以下。 於1個實施方式中，上述積層部之在40℃及92%RH時之透濕度為400 g/m 2・24 h以上。 於1個實施方式中，上述偏光板具有配置於上述偏光元件與上述相位差層之間之第二保護層。 於1個實施方式中，上述相位差層為液晶化合物之配向固化層。 於1個實施方式中，上述相位差層具有兩層以上之積層構造。 於1個實施方式中，上述積層體依次具有第一保護膜、上述偏光板、上述相位差層、及第二保護膜。 於1個實施方式中，上述第一保護膜之在40℃及92%RH時之透濕度為30 g/m 2・24 h以下。 於1個實施方式中，上述第二保護膜之在40℃及92%RH時之透濕度為30 g/m 2・24 h以下。 於1個實施方式中，將單片狀之上述積層體捆包而獲得上述捆包體。 於1個實施方式中，上述偏光板之厚度與上述相位差層之厚度之合計為83 μm以下。 於1個實施方式中，上述製造方法包含將上述偏光板與上述相位差層使用活性能量線硬化型接著劑積層之步驟。 於1個實施方式中，上述製造方法包含於上述捆包前對上述積層體實施加濕處理之步驟。 根據本發明之另一實施方式，提供附有相位差層之偏光板之保管方法。該保管方法包含如下步驟：準備具有偏光板及相位差層之積層體，該偏光板包含具有相互對向之第一主面及第二主面之偏光元件與配置於上述偏光元件之上述第一主面側之第一保護層，該相位差層配置於上述偏光元件之上述第二主面側；利用熱導率為0.2 W/m・K以下之捆包材將上述積層體捆包而獲得捆包體；及保管上述捆包體；自與上述偏光元件之上述第二主面鄰接而配置之層至上述相位差層為止之積層部、與上述第一保護層之在40℃及92%RH時之透濕度之差為350 g/m 2・24 h以上。 [發明之效果] According to an embodiment of the present invention, a method for manufacturing a polarizing plate with a retardation layer is provided. The manufacturing method includes the following steps: preparing a laminate having a polarizing plate and a retardation layer, the polarizing plate including a polarizing element having a first main surface and a second main surface facing each other and the above-mentioned first polarizing element disposed on the above-mentioned polarizing element. The first protective layer on the main surface side, the retardation layer is disposed on the second main surface side of the polarizing element; obtained by wrapping the above-mentioned laminate with a packing material having a thermal conductivity of 0.2 W/m·K or less Packing body; and storage of the above packing body; the lamination part from the layer arranged adjacent to the second main surface of the above-mentioned polarizing element to the above-mentioned retardation layer, and the above-mentioned first protective layer at 40°C and 92% The difference in moisture permeability at RH is more than 350 g/m 2 ·24 h. In one embodiment, the moisture permeability of the first protective layer at 40° C. and 92% RH is 100 g/m 2 ·24 h or less. In one embodiment, the moisture permeability of the laminated part at 40°C and 92%RH is 400 g/m 2 ·24 h or more. In one embodiment, the polarizing plate has a second protective layer arranged between the polarizing element and the retardation layer. In one embodiment, the retardation layer is an alignment solidified layer of a liquid crystal compound. In one embodiment, the retardation layer has a laminated structure of two or more layers. In one embodiment, the laminate has a first protective film, the polarizing plate, the retardation layer, and a second protective film in this order. In one embodiment, the moisture permeability of the first protective film at 40° C. and 92% RH is 30 g/m 2 ·24 h or less. In one embodiment, the moisture permeability of the second protective film at 40° C. and 92% RH is 30 g/m 2 ·24 h or less. In one embodiment, the above-mentioned packaged body is obtained by packaging the above-mentioned laminated body in the form of a single sheet. In one embodiment, the total of the thickness of the polarizing plate and the thickness of the retardation layer is 83 μm or less. In one embodiment, the manufacturing method includes a step of laminating the polarizing plate and the retardation layer using an active energy ray-curable adhesive. In one embodiment, the above-mentioned manufacturing method includes the step of performing a humidification treatment on the above-mentioned laminate before the above-mentioned packing. According to another embodiment of this invention, the storage method of the polarizing plate with a retardation layer is provided. The storage method includes the following steps: preparing a laminate having a polarizing plate and a retardation layer, the polarizing plate including a polarizing element having a first main surface and a second main surface facing each other and the above-mentioned first polarizing element arranged on the above-mentioned polarizing element. The first protective layer on the main surface side, the retardation layer is disposed on the second main surface side of the polarizing element; obtained by wrapping the above-mentioned laminate with a packing material having a thermal conductivity of 0.2 W/m・K or less Packaged body; and storage of the above-mentioned packaged body; the laminated portion from the layer arranged adjacent to the second main surface of the above-mentioned polarizing element to the above-mentioned retardation layer, and the above-mentioned first protective layer at 40°C and 92% The difference in moisture permeability at RH is more than 350 g/m 2 ·24 h. [Effect of Invention]

根據本發明之實施方式，藉由將具有偏光板及相位差層之積層體利用特定之捆包材進行捆包，可獲得抑制翹曲之附有相位差層之偏光板。According to an embodiment of the present invention, a polarizing plate with a retardation layer suppressing warping can be obtained by packaging a laminate having a polarizing plate and a retardation layer with a specific packing material.

以下，對本發明之實施方式進行說明，但本發明並不限定於該等實施方式。Embodiments of the present invention will be described below, but the present invention is not limited to these embodiments.

(用語及符號之定義) 本說明書中之用語及符號之定義如下所述。 (1)折射率(nx、ny、nz) 「nx」係面內之折射率最大之方向(即，遲相軸方向)之折射率，「ny」係於面內與遲相軸正交之方向(即，進相軸方向)之折射率，「nz」係厚度方向之折射率。 (2)面內相位差(Re) 「Re(λ)」係23℃時之以波長λnm之光測定出之面內相位差。例如，「Re(550)」係23℃時之以波長550 nm之光測定出之面內相位差。Re(λ)係於將層(膜)之厚度設為d(nm)時，藉由式：Re(λ)＝(nx－ny)×d而求出。 (3)厚度方向之相位差(Rth) 「Rth(λ)」係23℃時之以波長λnm之光測定出之厚度方向之相位差。例如，「Rth(550)」係23℃時之以波長550 nm之光測定出之厚度方向之相位差。Rth(λ)係於將層(膜)之厚度設為d(nm)時，藉由式：Rth(λ)＝(nx－nz)×d而求出。 (4)Nz係數 Nz係數藉由Nz＝Rth/Re而求出。 (5)角度 於本說明書中言及角度時，該角度包含相對於基準方向順時針及逆時針之兩者。因此，例如「45°」係指±45°。 (Definition of terms and symbols) Definitions of terms and symbols in this manual are as follows. (1) Refractive index (nx, ny, nz) "nx" is the refractive index in the direction of the maximum refractive index in the plane (that is, the direction of the slow axis), and "ny" is the refractive index in the direction perpendicular to the slow axis in the plane (that is, the direction of the slow axis) , "nz" is the refractive index in the thickness direction. (2) In-plane retardation (Re) "Re(λ)" is the in-plane retardation measured with light of wavelength λnm at 23°C. For example, "Re(550)" is the in-plane retardation measured with light having a wavelength of 550 nm at 23°C. Re(λ) is obtained by the formula: Re(λ)=(nx-ny)×d when the thickness of the layer (film) is d (nm). (3) Phase difference in thickness direction (Rth) "Rth(λ)" is the phase difference in the thickness direction measured with light of wavelength λnm at 23°C. For example, "Rth(550)" is the retardation in the thickness direction measured with light having a wavelength of 550 nm at 23°C. Rth(λ) is obtained by the formula: Rth(λ)=(nx−nz)×d when the thickness of the layer (film) is d (nm). (4) Nz coefficient The Nz coefficient is obtained by Nz=Rth/Re. (5) angle When referring to an angle in this specification, the angle includes both clockwise and counterclockwise with respect to a reference direction. Thus, for example, "45°" means ±45°.

本發明之1個實施方式之附有相位差層之偏光板之製造方法包含如下步驟：準備具有偏光板及相位差層之積層體，該偏光板包含偏光元件及保護層；及將積層體捆包。A method of manufacturing a polarizing plate with a retardation layer according to an embodiment of the present invention includes the following steps: preparing a laminate having a polarizing plate and a retardation layer, the polarizing plate including a polarizing element and a protective layer; and bundling the laminate Bag.

A.積層體 圖1係表示本發明之第一實施方式之積層體之概略構成之模式性的剖視圖。積層體100依次具有第一保護膜31、偏光板10、相位差層20及第二保護膜32。偏光元件11具有相互對向之第一主面11a及第二主面11b，於偏光元件之第一主面11a側(代表性的是視認側)配置第一保護層12。具體而言，偏光板10包含偏光元件11、及配置於偏光元件11之單側(未配置相位差層20之側)之第一保護層12。相位差層20具有包含第一相位差層21及第二相位差層22之積層構造。 A.Laminate FIG. 1 is a schematic cross-sectional view showing a schematic configuration of a laminate according to a first embodiment of the present invention. The laminate 100 has the first protective film 31 , the polarizing plate 10 , the retardation layer 20 and the second protective film 32 in this order. The polarizer 11 has a first main surface 11 a and a second main surface 11 b facing each other, and a first protective layer 12 is disposed on the first main surface 11 a side (typically the viewing side) of the polarizer. Specifically, the polarizing plate 10 includes a polarizing element 11 and a first protection layer 12 disposed on one side of the polarizing element 11 (the side where the retardation layer 20 is not disposed). The retardation layer 20 has a laminated structure including a first retardation layer 21 and a second retardation layer 22 .

圖2係表示本發明之第二實施方式之積層體之概略構成之模式性的剖視圖。積層體100依次具有第一保護膜31、偏光板10、相位差層20及第二保護膜32。偏光元件11具有相互對向之第一主面11a及第二主面11b，於偏光元件之第一主面11a側(代表性的是視認側)配置第一保護層12，於偏光元件之第二主面11b側配置第二保護層13。具體而言，偏光板10包含偏光元件11、配置於偏光元件11之單側(未配置相位差層20之側)之第一保護層12、及配置於偏光元件11之另一單側(偏光元件11與相位差層20之間)之第二保護層13。第二實施方式於在偏光元件11與相位差層20之間進而配置保護層(第二保護層)之方面，與上述第一實施方式不同。Fig. 2 is a schematic cross-sectional view showing a schematic configuration of a laminate according to a second embodiment of the present invention. The laminate 100 has the first protective film 31 , the polarizing plate 10 , the retardation layer 20 and the second protective film 32 in this order. The polarizing element 11 has a first main surface 11a and a second main surface 11b facing each other, and a first protective layer 12 is disposed on the first main surface 11a side (typically, the viewing side) of the polarizing element. The second protective layer 13 is disposed on the side of the two main surfaces 11b. Specifically, the polarizing plate 10 includes a polarizing element 11, a first protective layer 12 disposed on one side of the polarizing element 11 (the side where the retardation layer 20 is not disposed), and a first protection layer 12 disposed on the other side of the polarizing element 11 (the polarizing layer 20). The second protection layer 13 between the element 11 and the retardation layer 20). The second embodiment is different from the above-mentioned first embodiment in that a protective layer (second protective layer) is disposed between the polarizing element 11 and the retardation layer 20 .

於圖示例中，相位差層20具有包含第一相位差層21及第二相位差層22之積層構造，但與圖示例不同，相位差層20亦可具有三層以上之積層構造，亦可設為單一層。In the illustrated example, the retardation layer 20 has a laminated structure including a first retardation layer 21 and a second retardation layer 22, but unlike the illustrated example, the retardation layer 20 may also have a laminated structure of more than three layers, It can also be set as a single layer.

雖然未圖示，但積層體亦可進而具有其他功能層。積層體可具有之功能層之種類、特性、數量、組合、配置等可根據目的來適當地設定。例如，積層體亦可進而具有導電層或附有導電層之各向同性基材。導電層或附有導電層之各向同性基材，代表性的是配置於相位差層20與第二保護膜32之間。再者，具有導電層或附有導電層之各向同性基材之積層體(附有相位差層之偏光板)，例如適用於在圖像顯示面板內部組裝有觸控感測器之所謂內嵌式觸控面板型輸入顯示裝置。作為另一例，積層體亦可進而具有其他相位差層。其他相位差層之光學性特性(例如折射率特性、面內相位差、Nz係數、光彈性係數)、厚度、配置等可根據目的來適當地設定。作為具體例，亦可於偏光元件11之視認側，設置改善經由偏光太陽鏡而視認之情形時之視認性之其他相位差層(代表性的是，賦予(橢)圓偏光功能之層、賦予超高相位差之層)。藉由具有此種層，即便於經由偏光太陽鏡等偏光透鏡而視認顯示畫面之情形時，亦可實現優異之視認性。因此，所獲得之附有相位差層之偏光板亦可較佳地適用於可在室外使用之圖像顯示裝置。Although not shown, the laminate may further have other functional layers. The kind, characteristic, number, combination, arrangement, etc. of the functional layers which a laminate may have can be set suitably according to the objective. For example, the laminate may further have a conductive layer or an isotropic substrate with a conductive layer. The conductive layer or the isotropic substrate with the conductive layer is typically disposed between the retardation layer 20 and the second protective film 32 . Furthermore, a laminate having a conductive layer or an isotropic base material with a conductive layer (polarizing plate with a retardation layer), for example, is suitable for a so-called internal display panel in which a touch sensor is assembled. Embedded touch panel type input display device. As another example, the laminate may further have another retardation layer. The optical characteristics (for example, refractive index characteristics, in-plane retardation, Nz coefficient, photoelastic coefficient), thickness, arrangement, etc. of other retardation layers can be appropriately set according to the purpose. As a specific example, on the viewing side of the polarizing element 11, another retardation layer (typically, a layer imparting (elliptical) polarizing function, a layer imparting super layer with high retardation). By having such a layer, excellent visibility can be realized even when a display screen is viewed through polarized lenses such as polarized sunglasses. Therefore, the obtained polarizing plate with a retardation layer can also be preferably used in image display devices that can be used outdoors.

構成積層體之各構件可隔著任意之適當的接著層(未圖示)而積層。作為接著層之具體例，可列舉接著劑層、黏著劑層。例如，第一保護膜31隔著黏著劑層而貼合於偏光板10。第一保護膜31亦可直至藉由本發明之實施方式而獲得之附有相位差層之偏光板供於使用為止(積層於圖像顯示面板為止)進行剝離，或者於最終製品(圖像顯示裝置)之製造過程中剝離，亦可直接搭載於最終製品。Each member constituting the laminate can be laminated via any appropriate adhesive layer (not shown). Specific examples of the adhesive layer include an adhesive layer and an adhesive layer. For example, the first protective film 31 is attached to the polarizing plate 10 via an adhesive layer. The first protective film 31 can also be peeled off until the polarizing plate with a retardation layer obtained by the embodiment of the present invention is used (laminated on the image display panel), or the final product (image display device) ) during the manufacturing process can also be directly mounted on the final product.

例如，第二保護膜32隔著黏著劑層而貼合於相位差層20。實用上，第二保護膜32可作為直至藉由本發明之實施方式而獲得之附有相位差層之偏光板供於使用為止暫時黏著之剝離膜(隔離膜)發揮功能。藉由暫時黏著剝離膜，例如能夠保護黏著劑層，並且能夠形成積層體卷。For example, the second protective film 32 is bonded to the retardation layer 20 via an adhesive layer. Practically, the second protective film 32 can function as a peeling film (separation film) that is temporarily adhered until the polarizing plate with a retardation layer obtained by the embodiment of the present invention is used. By temporarily adhering the release film, for example, the adhesive layer can be protected and a laminate roll can be formed.

例如，相位差層20隔著接著劑層(較佳為，使用活性能量線硬化型接著劑)而貼合於偏光板10。於相位差層20具有兩層以上之積層構造之情形時，各相位差層隔著接著劑層(較佳為，使用活性能量線硬化型接著劑)而貼合。For example, the retardation layer 20 is bonded to the polarizing plate 10 through an adhesive layer (preferably, an active energy ray-curable adhesive is used). When the retardation layer 20 has a laminated structure of two or more layers, the respective retardation layers are bonded via an adhesive layer (preferably, an active energy ray-curable adhesive is used).

A-1.偏光板 上述偏光板包含偏光元件及保護層。偏光板之厚度雖亦取決於所包含之保護層之數量，但較佳為20 μm以上，更佳為25 μm以上。另一方面，偏光板之厚度較佳為75 μm以下。偏光板之厚度亦可為70 μm以下，亦可為65 μm以下，亦可為60 μm以下。再者，於在將偏光元件與保護層積層時使用接著層之情形時，偏光板之厚度不包含該接著層之厚度。 A-1. Polarizing plate The above-mentioned polarizing plate includes a polarizing element and a protective layer. Although the thickness of the polarizing plate also depends on the number of protective layers included, it is preferably at least 20 μm, more preferably at least 25 μm. On the other hand, the thickness of the polarizing plate is preferably 75 μm or less. The thickness of the polarizing plate may be 70 μm or less, 65 μm or less, or 60 μm or less. Furthermore, when an adhesive layer is used when laminating the polarizing element and the protective layer, the thickness of the polarizing plate does not include the thickness of the adhesive layer.

上述偏光元件代表性的是包含二色性物質(例如碘)之樹脂膜。作為樹脂膜，例如可列舉聚乙烯醇(PVA)系膜、局部縮甲醛化PVA系膜、乙烯-乙酸乙烯酯共聚物系局部皂化膜等親水性高分子膜。The above-mentioned polarizing element is typically a resin film containing a dichroic substance (for example, iodine). Examples of the resin film include hydrophilic polymer films such as polyvinyl alcohol (PVA)-based films, partially formalized PVA-based films, and ethylene-vinyl acetate copolymer-based partially saponified films.

偏光元件之厚度較佳為15 μm以下，更佳為12 μm以下，進而較佳為10 μm以下。另一方面，偏光元件之厚度較佳為1 μm以上。The thickness of the polarizing element is preferably not more than 15 μm, more preferably not more than 12 μm, and still more preferably not more than 10 μm. On the other hand, the thickness of the polarizing element is preferably 1 μm or more.

偏光元件較佳為於波長380 nm～780 nm之任一波長顯示吸收二色性。偏光元件之單體透過率例如為41.5%～46.0%，較佳為42.0%～46.0%，更佳為44.5%～46.0%。偏光元件之偏光度較佳為97.0%以上，更佳為99.0%以上，進而較佳為99.9%以上。The polarizing element preferably exhibits absorption dichroism at any wavelength between 380 nm and 780 nm. The single transmittance of the polarizing element is, for example, 41.5%-46.0%, preferably 42.0%-46.0%, more preferably 44.5%-46.0%. The degree of polarization of the polarizing element is preferably at least 97.0%, more preferably at least 99.0%, and still more preferably at least 99.9%.

上述保護層可由能作為偏光元件之保護層來使用之任意適當的膜形成。作為成為該膜之主成分之材料之具體例，可列舉三乙醯纖維素(TAC)等纖維素系樹脂、聚酯系、聚乙烯醇系、聚碳酸酯系、聚醯胺系、聚醯亞胺系、聚醚碸系、聚碸系、聚苯乙烯系、聚降冰片烯等環烯烴系、聚烯烴系、(甲基)丙烯酸系、乙酸酯系等透明樹脂。The above-mentioned protective layer can be formed of any appropriate film that can be used as a protective layer of a polarizing element. Specific examples of the material constituting the main component of the film include cellulose-based resins such as triacetyl cellulose (TAC), polyester-based, polyvinyl alcohol-based, polycarbonate-based, polyamide-based, and polyamide-based resins. Transparent resins such as imine-based, polyether-based, poly-polyurethane-based, polystyrene-based, polynorbornene-based, polyolefin-based, (meth)acrylic-based, acetate-based, etc.

藉由本發明之實施方式而獲得之附有相位差層之偏光板，代表性的是配置於圖像顯示裝置之視認側，且第一保護層12配置於視認側。因此，亦可視需要而對第一保護層12實施硬塗(HC)處理、抗反射處理、抗黏處理、防眩處理等表面處理。The polarizing plate with a retardation layer obtained by the embodiment of the present invention is typically arranged on the viewing side of the image display device, and the first protective layer 12 is arranged on the viewing side. Therefore, surface treatments such as hard coat (HC) treatment, anti-reflection treatment, anti-sticking treatment, and anti-glare treatment can also be performed on the first protective layer 12 as required.

保護層之厚度較佳為5 μm～80 μm，更佳為10 μm～40 μm，進而較佳為15 μm～35 μm。再者，於實施上述表面處理之情形時，第一保護層12之厚度為包含表面處理層之厚度在內之厚度。The thickness of the protective layer is preferably from 5 μm to 80 μm, more preferably from 10 μm to 40 μm, and still more preferably from 15 μm to 35 μm. Furthermore, in the case of implementing the above-mentioned surface treatment, the thickness of the first protective layer 12 is the thickness including the thickness of the surface treatment layer.

於1個實施方式中，配置於偏光元件11與相位差層20之間之第二保護層13較佳為光學性各向同性。於本說明書中所謂「光學性各向同性」，係指面內相位差Re(550)為0 nm～10 nm，厚度方向之相位差Rth(550)為-10 nm～+10 nm。配置於偏光元件11與相位差層20之間之保護層之厚度較佳為5 μm～80 μm，更佳為10 μm～40 μm，進而較佳為10 μm～30 μm。In one embodiment, the second protective layer 13 disposed between the polarizer 11 and the retardation layer 20 is preferably optically isotropic. The term "optically isotropic" in this specification means that the in-plane retardation Re(550) is 0 nm to 10 nm, and the retardation Rth(550) in the thickness direction is -10 nm to +10 nm. The thickness of the protective layer disposed between the polarizing element 11 and the retardation layer 20 is preferably 5 μm˜80 μm, more preferably 10 μm˜40 μm, further preferably 10 μm˜30 μm.

偏光板可利用任意之適當方法來製作。具體而言，偏光板可包含自單層之樹脂膜製作之偏光元件，亦可包含使用兩層以上之積層體獲得之偏光元件。A polarizing plate can be produced by any appropriate method. Specifically, the polarizing plate may include a polarizing element produced from a single-layer resin film, or may include a polarizing element obtained by using a laminate of two or more layers.

自上述單層之樹脂膜製造偏光元件之方法，代表性的是，包含對樹脂膜實施利用碘、二色性染料等二色性物質之染色處理與延伸處理。作為樹脂膜，例如使用聚乙烯醇(PVA)系膜、局部縮甲醛化PVA系膜、乙烯-乙酸乙烯酯共聚物系局部皂化膜等親水性高分子膜。該方法亦可進而包含不溶化處理、膨潤處理、交聯處理等。藉由在所獲得之偏光元件之至少一者積層保護層而可獲得偏光板。此種製造方法由於在業界為周知慣用之方法，故而省略詳細的說明。The method of manufacturing a polarizing element from the above-mentioned single-layer resin film typically includes dyeing the resin film with a dichroic substance such as iodine or a dichroic dye, and stretching. As the resin film, for example, hydrophilic polymer films such as polyvinyl alcohol (PVA)-based films, partially formalized PVA-based films, and ethylene-vinyl acetate copolymer-based partially saponified films are used. This method may further include insolubilization treatment, swelling treatment, crosslinking treatment and the like. A polarizing plate can be obtained by laminating a protective layer on at least one of the obtained polarizing elements. Since such a manufacturing method is well known and commonly used in the industry, detailed description is omitted.

作為使用上述積層體獲得之偏光元件之具體例，可列舉使用樹脂基材與積層於該樹脂基材之PVA系樹脂層(PVA系樹脂膜)之積層體，或者樹脂基材與塗佈形成於該樹脂基材之PVA系樹脂層之積層體獲得之偏光元件。使用樹脂基材與塗佈形成於該樹脂基材之PVA系樹脂層之積層體而獲得之偏光元件，例如可藉由以下步驟而製作：將PVA系樹脂溶液塗佈於樹脂基材並使之乾燥而於樹脂基材上形成PVA系樹脂層，獲得樹脂基材與PVA系樹脂層之積層體；及將該積層體延伸及染色而使PVA系樹脂層為偏光元件。於本實施方式中，較佳為，於樹脂基材之單側，形成包含鹵化物與聚乙烯醇系樹脂之聚乙烯醇系樹脂層。延伸代表性的是包含使積層體浸漬於硼酸水溶液中而延伸。進而，延伸視需要可進而包含在硼酸水溶液中之延伸之前將積層體以高溫(例如，95℃以上)進行空中延伸。另外，於本實施方式中，較佳為，將積層體供於藉由一面在長度方向搬送一面加熱而於寬度方向收縮2%以上之乾燥收縮處理。代表性的是，本實施方式之製造方法包含依次對積層體實施空中輔助延伸處理、染色處理、水中延伸處理、及乾燥收縮處理。藉由導入輔助延伸，即便於在熱塑性樹脂上塗佈PVA之情形時，亦能夠提高PVA之結晶性，能夠達成較高之光學特性。又，同時藉由事前提高PVA之配向性，而於在之後之染色工序、延伸工序中浸漬於水中時，可防止PVA之配向性之降低、溶解等問題，能夠達成較高之光學特性。進而，於將PVA系樹脂層浸漬於液體中之情形時，與PVA系樹脂層不包含鹵化物之情形相比，可抑制聚乙烯醇分子之配向之紊亂、及配向性之降低。藉此，可提高經過染色處理及水中延伸處理等將積層體浸漬於液體中進行之處理工序而獲得之偏光元件之光學特性。進而，藉由利用乾燥收縮處理使積層體於寬度方向收縮，可提高光學特性。所獲得之樹脂基材/偏光元件之積層體可直接使用(即，可將樹脂基材作為偏光元件之保護層)，亦可於自樹脂基材/偏光元件之積層體剝離了樹脂基材之剝離面，或者在與剝離面為相反側之面積層符合需要之任意適當的保護層而使用。此種偏光元件之製造方法之詳細情況例如記載於日本專利特開2012-73580號公報、日本專利第6470455號。該等公報之全體記載作為參考引用於本說明書中。Specific examples of the polarizing element obtained by using the above-mentioned laminate include a laminate using a resin base material and a PVA-based resin layer (PVA-based resin film) laminated on the resin base material, or a resin base material formed by coating on A polarizing element obtained by a laminate of PVA-based resin layers of the resin substrate. A polarizing element obtained by using a laminate of a resin base material and a PVA-based resin layer coated and formed on the resin base material can be produced, for example, by applying a PVA-based resin solution to the resin base material and making it drying to form a PVA-based resin layer on the resin substrate to obtain a laminate of the resin substrate and the PVA-based resin layer; and stretching and dyeing the laminate to make the PVA-based resin layer a polarizer. In this embodiment, preferably, a polyvinyl alcohol-based resin layer including a halide and a polyvinyl alcohol-based resin is formed on one side of the resin substrate. Extending typically includes extending the laminate by immersing it in an aqueous solution of boric acid. Furthermore, stretching may further include stretching the laminate in air at a high temperature (for example, 95° C. or higher) before stretching in a boric acid aqueous solution, if necessary. Moreover, in this embodiment, it is preferable to subject the laminated body to the dry shrinkage process which shrinks by 2% or more in the width direction by heating while being conveyed in the longitudinal direction. Typically, the manufacturing method of this embodiment includes sequentially performing aerial assisted stretching treatment, dyeing treatment, underwater stretching treatment, and drying shrinkage treatment on the laminate. By introducing auxiliary stretching, even when PVA is coated on a thermoplastic resin, the crystallinity of PVA can be improved, and high optical characteristics can be achieved. At the same time, by improving the alignment of PVA in advance, when it is immersed in water in the subsequent dyeing process and stretching process, problems such as reduction of alignment of PVA and dissolution can be prevented, and higher optical properties can be achieved. Furthermore, when the PVA-based resin layer is immersed in a liquid, compared with the case where the PVA-based resin layer does not contain a halide, disorder of alignment of polyvinyl alcohol molecules and a decrease in alignment can be suppressed. Thereby, the optical characteristics of the polarizing element obtained through the process of immersing the laminate in liquid, such as dyeing and underwater stretching, can be improved. Furthermore, optical characteristics can be improved by shrinking the laminate in the width direction by drying shrinkage treatment. The obtained 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. The peeling surface, or any suitable protective layer is used on the surface opposite to the peeling surface as required. The details of the manufacturing method of such a polarizing element are described in, for example, Japanese Patent Laid-Open No. 2012-73580 and Japanese Patent No. 6470455. The entire descriptions of these publications are incorporated herein by reference.

A-2.相位差層 上述相位差層之厚度雖亦取決於其構成(為單一層還是具有積層構造)，但較佳為8 μm以下，更佳為5 μm以下。另一方面，相位差層之厚度例如為1 μm以上。再者，於相位差層為積層構造之情形時，「相位差層之厚度」係指各相位差層之厚度之合計。具體而言，「相位差層之厚度」不包含接著層之厚度。 A-2. Retardation layer The thickness of the aforementioned retardation layer also depends on its composition (single layer or multilayer structure), but it is preferably 8 μm or less, more preferably 5 μm or less. On the other hand, the thickness of the retardation layer is, for example, 1 μm or more. Furthermore, when the retardation layer has a laminated structure, the "thickness of the retardation layer" means the sum of the thicknesses of the respective retardation layers. Specifically, the "thickness of the retardation layer" does not include the thickness of the adhesive layer.

作為上述相位差層，較佳為使用液晶化合物之配向固化層(液晶配向固化層)。藉由使用液晶化合物，例如可使所獲得之相位差層之nx與ny之差相比於非液晶材料特別大，故而可使用以獲得所期望之面內相位差之相位差層之厚度特別小。因此，可實現附有相位差層之偏光板之明顯之薄型化。於本說明書中所謂「配向固化層」，係指液晶化合物於層內在特定之方向配向，且其配向狀態固定之層。再者，「配向固化層」如下所述係包含使液晶單體硬化而獲得之配向硬化層之概念。於相位差層中，代表性的是，棒狀之液晶化合物以排列於相位差層之遲相軸方向之狀態配向(水平配向)。As the retardation layer, it is preferable to use an alignment-cured layer (liquid crystal alignment-cured layer) of a liquid crystal compound. By using a liquid crystal compound, for example, the difference between nx and ny of the obtained retardation layer can be particularly large compared with non-liquid crystal materials, so the thickness of the retardation layer that can obtain the desired in-plane retardation can be used to be particularly small . Therefore, significant thinning of the polarizing plate with the retardation layer can be realized. The so-called "alignment solidified layer" in this specification refers to a layer in which liquid crystal compounds are aligned in a specific direction within the layer, and the alignment state is fixed. In addition, the "alignment hardened layer" as described below includes the concept of an alignment hardened layer obtained by hardening a liquid crystal monomer. In the retardation layer, typically, the rod-shaped liquid crystal compound is aligned (horizontal alignment) in a state aligned in the slow axis direction of the retardation layer.

上述液晶配向固化層可藉由以下步驟而形成，即，對特定之基材之表面實施配向處理，於該表面塗佈包含液晶化合物之塗佈液而使該液晶化合物於與上述配向處理對應之方向配向，並將該配向狀態固定。作為配向處理，可採用任意之適當的配向處理。具體而言，可列舉機械性的配向處理、物理性的配向處理、化學性的配向處理。作為機械性的配向處理之具體例，可列舉摩擦處理、延伸處理。作為物理性的配向處理之具體例，可列舉磁場配向處理、電場配向處理。作為化學性的配向處理之具體例，可列舉斜向蒸鍍法、光配向處理。各種配向處理之處理條件可根據目的而採用任意之適當的條件。The above-mentioned liquid crystal alignment solidified layer can be formed by the following steps, that is, performing an alignment treatment on the surface of a specific substrate, coating the coating liquid containing a liquid crystal compound on the surface, and making the liquid crystal compound in a position corresponding to the above-mentioned alignment treatment. direction alignment, and the alignment state is fixed. As the alignment treatment, any appropriate alignment treatment can be employed. Specifically, mechanical alignment treatment, physical alignment treatment, and chemical alignment treatment are mentioned. Specific examples of mechanical alignment treatment include rubbing 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 vapor deposition and photo-alignment treatment. As the treatment conditions of various alignment treatments, any appropriate conditions can be adopted according to the purpose.

液晶化合物之配向藉由以根據液晶化合物之種類而顯示液晶相之溫度來處理而進行。藉由進行此種溫度處理，而液晶化合物呈液晶狀態，該液晶化合物對應於基材表面之配向處理方向而配向。Alignment of the liquid crystal compound is performed by treating at a temperature at which a liquid crystal phase is displayed depending on the type of the liquid crystal compound. By performing such temperature treatment, the liquid crystal compound is in a liquid crystal state, and the liquid crystal compound is aligned corresponding to the direction of the alignment treatment on the surface of the substrate.

於1個實施方式中，配向狀態之固定係藉由將如上所述配向之液晶化合物冷卻而進行。於液晶化合物為聚合性單體或交聯性單體之情形時，配向狀態之固定係藉由對如上所述配向之液晶化合物實施聚合處理或交聯處理而進行。In one embodiment, the alignment state is fixed by cooling the liquid crystal compound aligned as described above. In the case where the liquid crystal compound is a polymerizable monomer or a crosslinkable monomer, the alignment state is fixed by performing polymerization treatment or crosslinking treatment on the liquid crystal compound aligned as described above.

液晶化合物之具體例及配向固化層之形成方法之詳細情況記載於日本專利特開2006-163343號公報。該公報之記載作為參考引用於本說明書中。Specific examples of liquid crystal compounds and details of a method for forming an alignment solidified layer are described in Japanese Patent Laid-Open No. 2006-163343. The description of this publication is incorporated in this specification as a reference.

相位差層如上所述，可為單一層，亦可為具有兩層以上之積層構造。As mentioned above, the retardation layer may be a single layer or may have a laminated structure having two or more layers.

與圖示例不同，於相位差層為單一層之情形時之1個實施方式中，相位差層可作為λ/4板發揮功能。具體而言，相位差層之Re(550)較佳為100 nm～180 nm，更佳為110 nm～170 nm，進而較佳為110 nm～160 nm。相位差層之厚度可以獲得λ/4板之所期望之面內相位差之方式調整。於相位差層為上述液晶配向固化層之情形時，其厚度例如為1.0 μm～2.5 μm。於本實施方式中，相位差層之遲相軸與偏光元件之吸收軸所成之角度較佳為40°～50°，更佳為42°～48°，進而較佳為44°～46°。又，較佳為，相位差層顯示相位差值根據測定光之波長而變大之逆波長色散特性。Unlike the illustrated example, in one embodiment where the retardation layer is a single layer, the retardation layer can function as a λ/4 plate. Specifically, the Re(550) of the retardation layer is preferably from 100 nm to 180 nm, more preferably from 110 nm to 170 nm, and still more preferably from 110 nm to 160 nm. The thickness of the retardation layer can be adjusted in such a way that a desired in-plane retardation of the λ/4 plate is obtained. When the retardation layer is the liquid crystal alignment solidified layer described above, its thickness is, for example, 1.0 μm to 2.5 μm. In this embodiment, the angle formed by the retardation axis of the retardation layer and the absorption axis of the polarizer is preferably 40°-50°, more preferably 42°-48°, further preferably 44°-46° . Moreover, it is preferable that the retardation layer exhibits inverse wavelength dispersion characteristics in which the retardation value increases according to the wavelength of the measurement light.

如圖所示，於相位差層20具有積層構造之情形時之1個實施方式中，相位差層20具有自偏光板10側依次配置有第一相位差層(H層)21與第二相位差層(Q層)22之兩層之積層構造。H層代表性的是可作為λ/2板發揮功能，Q層代表性的是可作為λ/4板發揮功能。具體而言，H層之Re(550)較佳為200 nm～300 nm，更佳為220 nm～290 nm，進而較佳為230 nm～280 nm；Q層之Re(550)較佳為100 nm～180 nm，更佳為110 nm～170 nm，進而較佳為110 nm～150 nm。H層之厚度可以獲得λ/2板之所期望之面內相位差之方式調整。於H層為上述液晶配向固化層之情形時，其厚度例如為2.0 μm～4.0 μm。Q層之厚度可以獲得λ/4板之所期望之面內相位差之方式調整。於Q層為上述液晶配向固化層之情形時，其厚度例如為1.0 μm～2.5 μm。於本實施方式中，H層之遲相軸與偏光元件之吸收軸所成之角度較佳為10°～20°，更佳為12°～18°，進而較佳為12°～16°；Q層之遲相軸與偏光元件之吸收軸所成之角度較佳為70°～80°，更佳為72°～78°，進而較佳為72°～76°。再者，H層及Q層之配置順序亦可相反，H層之遲相軸與偏光元件之吸收軸所成之角度及Q層之遲相軸與偏光元件之吸收軸所成之角度亦可相反。又，各層(例如H層及Q層)亦可顯示相位差值根據測定光之波長而變大之逆波長色散特性，亦可顯示相位差值根據測定光之波長而變小之正波長色散特性，亦可顯示相位差值幾乎不根據測定光之波長而變化之平坦波長色散特性。As shown in the figure, in one embodiment where the retardation layer 20 has a laminated structure, the retardation layer 20 has a first retardation layer (H layer) 21 and a second retardation layer arranged in order from the polarizing plate 10 side. The laminated structure of the two layers of the poor layer (Q layer) 22. The H layer typically functions as a λ/2 plate, and the Q layer typically functions as a λ/4 plate. Specifically, the 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; the Re(550) of the Q layer is preferably 100 nm nm to 180 nm, more preferably 110 nm to 170 nm, further preferably 110 nm to 150 nm. The thickness of the H layer can be adjusted in such a way that a desired in-plane retardation of the λ/2 plate is obtained. When the H layer is the liquid crystal alignment solidified layer, its thickness is, for example, 2.0 μm to 4.0 μm. The thickness of the Q layer can be adjusted in such a way as to obtain the desired in-plane retardation of the λ/4 plate. In the case where the Q layer is the above liquid crystal alignment solidified layer, its thickness is, for example, 1.0 μm to 2.5 μm. In this embodiment, the angle formed by the retardation axis of the H layer and the absorption axis of the polarizer is preferably 10°-20°, more preferably 12°-18°, further preferably 12°-16°; The angle formed by the retardation axis of the Q layer and the absorption axis of the polarizing element is preferably 70°-80°, more preferably 72°-78°, further preferably 72°-76°. Furthermore, the configuration order of the H layer and the Q layer can also be reversed, 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 on the contrary. In addition, each layer (such as the H layer and the Q layer) can also show the reverse wavelength dispersion characteristic that the retardation value becomes larger according to the wavelength of the measurement light, and can also display the positive wavelength dispersion characteristic that the retardation value becomes smaller according to the wavelength of the measurement light. , It can also show a flat wavelength dispersion characteristic that the retardation value hardly changes according to the wavelength of the measurement light.

相位差層(於具有積層構造之情形時為至少一個層)，代表性的是顯示折射率特性為nx＞ny＝nz之關係。再者，「ny＝nz」不僅為ny與nz完全相等之情形，包含實質上相等之情形。因此，於不損及本發明之效果之範圍內，可存在ny＞nz或ny＜nz之情形。相位差層之Nz係數較佳為0.9～1.5，更佳為0.9～1.3。The retardation layer (at least one layer in the case of having a laminated structure) typically exhibits a relationship of nx>ny=nz in refractive index characteristics. Furthermore, "ny=nz" is not only the case where ny and nz are completely equal, but also the case where they are substantially equal. Therefore, ny>nz or ny<nz may exist within the range that does not impair the effects of the present invention. The Nz coefficient of the retardation layer is preferably from 0.9 to 1.5, more preferably from 0.9 to 1.3.

如上所述，相位差層較佳為液晶配向固化層。作為上述液晶化合物，例如可列舉液晶相為向列相之液晶化合物(向列型液晶)。作為此種液晶化合物，例如能夠使用液晶聚合物、液晶單體。液晶化合物之液晶性之表現機構可為向液性，亦可為向熱性。液晶聚合物及液晶單體可分別單獨使用，亦可組合使用。As mentioned above, the phase difference layer is preferably a liquid crystal alignment solidified layer. As said liquid crystal compound, the liquid crystal compound (nematic liquid crystal) whose liquid crystal phase is a nematic phase is mentioned, for example. As such liquid crystal compounds, for example, liquid crystal polymers and liquid crystal monomers can be used. The expression mechanism of the liquid crystallinity of the liquid crystal compound may be liquid tropism or thermotropism. The liquid crystal polymer and the liquid crystal monomer may be used alone or in combination.

於液晶化合物為液晶單體之情形時，該液晶單體較佳為聚合性單體及交聯性單體。其原因在於，藉由使液晶單體聚合或交聯(即硬化)，可使液晶單體之配向狀態固定。於使液晶單體配向之後，例如若使液晶單體彼此聚合或交聯，則藉此可將上述配向狀態固定。此處，藉由聚合而形成聚合物，藉由交聯而形成立體網狀構造，但該等為非液晶性。因此，所形成之相位差層例如不會產生由液晶性化合物特有之溫度變化所致之向液晶相、玻璃相、結晶相之轉移。其結果，相位差層成為不會對溫度變化產生影響之穩定性極優異之相位差層。When the liquid crystal compound is a liquid crystal monomer, the liquid crystal monomer is preferably a polymerizable monomer and a crosslinkable monomer. The reason for this is that the alignment state of the liquid crystal monomer can be fixed by polymerizing or crosslinking (ie, hardening) the liquid crystal monomer. After aligning the liquid crystal monomers, for example, if the liquid crystal monomers are polymerized or cross-linked, the alignment state can be fixed. Here, a polymer is formed by polymerization, and a three-dimensional network structure is formed by crosslinking, but these are non-liquid crystalline. Therefore, the retardation layer formed does not undergo transition to a liquid crystal phase, a glass phase, or a crystalline phase due to temperature changes peculiar to liquid crystal compounds, for example. As a result, the retardation layer becomes an extremely excellent retardation layer that does not have influence on temperature changes.

液晶單體顯示液晶性之溫度範圍根據其種類而不同。具體而言，該溫度範圍較佳為40℃～120℃，進而較佳為50℃～100℃，最佳為60℃～90℃。The temperature range in which a liquid crystal monomer exhibits liquid crystallinity differs depending on its type. Specifically, the temperature range is preferably from 40°C to 120°C, more preferably from 50°C to 100°C, most preferably from 60°C to 90°C.

作為上述液晶單體，可採用任意之適當的液晶單體。例如，可使用日本專利特表2002-533742(WO00/37585)、EP358208(US5211877)、EP66137(US4388453)、WO93/22397、EP0261712、DE19504224、DE4408171、及GB2280445等中所記載之聚合性液晶原基化合物等。作為此種聚合性液晶原基化合物之具體例，例如，可列舉BASF公司之商品名LC242、Merck公司之商品名E7、Wacker-Chem公司之商品名LC-Sillicon-CC3767。作為液晶單體，較佳為向列性液晶單體。Any appropriate liquid crystal monomer can be used as the liquid crystal monomer. For example, polymerizable mesogen compounds described in Japanese Patent Application Laid-Open No. 2002-533742 (WO00/37585), EP358208 (US5211877), EP66137 (US4388453), WO93/22397, EP0261712, DE19504224, DE4408171, and GB2280445 can be used. wait. Specific examples of such polymerizable mesogen compounds include, for example, BASF's brand name LC242, Merck's brand name E7, and Wacker-Chem's brand name LC-Sillicon-CC3767. As the liquid crystal monomer, a nematic liquid crystal monomer is preferred.

於另一實施方式中，相位差層20具有可作為λ/4板發揮功能之第一相位差層21、及折射率特性顯示nz＞nx＝ny之關係之第二相位差層22(所謂正C板)之積層構造。關於λ/4板之詳細情況如上所述。於本實施方式中，第一相位差層之遲相軸與偏光元件之吸收軸所成之角度較佳為40°～50°，更佳為42°～48°，進而較佳為44°～46°。又，較佳為，第一相位差層顯示相位差值根據測定光之波長而變大之逆波長色散特性。In another embodiment, the retardation layer 20 has a first retardation layer 21 which can function as a λ/4 plate, and a second retardation layer 22 whose refractive index characteristics show the relationship of nz>nx=ny (so-called positive C plate) laminated structure. Details about the λ/4 plate are as described above. In this embodiment, the angle formed by the retardation axis of the first retardation layer and the absorption axis of the polarizer is preferably 40°-50°, more preferably 42°-48°, further preferably 44°- 46°. Moreover, it is preferable that the first retardation layer exhibits inverse wavelength dispersion characteristics in which the retardation value increases according to the wavelength of the measurement light.

上述正C板之厚度方向之相位差Rth(550)較佳為-50 nm～-300 nm，更佳為-70 nm～-250 nm，進而較佳為-90 nm～-200 nm，特佳為-100 nm～-180 nm。此處，「nx＝ny」不僅包含nx與ny嚴格地相等之情形時，亦包含nx與ny實質上相等之情形時。正C板之面內相位差Re(550)例如未達10 nm。The retardation Rth(550) in the thickness direction of the positive C plate is preferably -50 nm to -300 nm, more preferably -70 nm to -250 nm, and further preferably -90 nm to -200 nm, especially preferably It is -100 nm ~ -180 nm. Here, "nx=ny" includes not only the case where nx and ny are strictly equal, but also the case where nx and ny are substantially equal. The in-plane retardation Re(550) of the positive C plate is, for example, less than 10 nm.

具有nz＞nx＝ny之折射率特性之第二相位差層可由任意之適當的材料形成，但較佳為，包括含有固定為垂直配向之液晶材料之膜。可垂直配向之液晶材料(液晶化合物)可為液晶單體，亦可為液晶聚合物。作為該液晶化合物及該相位差層之形成方法之具體例，可列舉日本專利特開2002-333642號公報之[0020]～[0028]中所記載之液晶化合物及該相位差層之形成方法。於該情形時，第二相位差層之厚度較佳為0.5 μm～5 μm。The second retardation layer having a refractive index characteristic of nz>nx=ny may be formed of any appropriate material, but preferably includes a film containing a liquid crystal material fixed in a homeotropic alignment. The vertically aligned liquid crystal material (liquid crystal compound) can be a liquid crystal monomer or a liquid crystal polymer. Specific examples of the liquid crystal compound and the method for forming the retardation layer include the liquid crystal compound and the method for forming the retardation layer described in [0020] to [0028] of JP-A-2002-333642. In this case, the thickness of the second retardation layer is preferably from 0.5 μm to 5 μm.

A-3.偏光板與相位差層之關係 上述偏光板之厚度與上述相位差層之厚度之合計(以下，存在簡稱為「總厚度」之情形)較佳為83 μm以下，更佳為70 μm以下，進而較佳為66 μm以下。另一方面，總厚度例如為25 μm以上。 A-3. Relationship between polarizer and retardation layer The total of the thickness of the polarizing plate and the thickness of the retardation layer (hereinafter, may be simply referred to as "total thickness") is preferably 83 μm or less, more preferably 70 μm or less, and still more preferably 66 μm or less. On the other hand, the total thickness is, for example, 25 μm or more.

上述偏光板之厚度相對於上述相位差層之厚度之比(偏光板之厚度/相位差層之厚度，以下存在簡稱為「厚度比」之情形)較佳為5以上，更佳為8以上，進而較佳為10以上。另一方面，厚度比較佳為30以下，更佳為25以下。The ratio of the thickness of the polarizing plate to the thickness of the retardation layer (thickness of the polarizing plate/thickness of the retardation layer, hereinafter referred to as “thickness ratio”) is preferably 5 or more, more preferably 8 or more, Furthermore, it is more preferably 10 or more. On the other hand, the thickness ratio is preferably 30 or less, more preferably 25 or less.

自與偏光元件11之第二主面11b鄰接而配置之層至相位差層20為止之積層部、與第一保護層12之在40℃及92%RH時之透濕度之差為350 g/m 2・24 h以上，亦可為400 g/m 2・24 h以上，亦可為500 g/m 2・24 h以上。本發明人等發現在配置於偏光元件之第一主面側及第二主面側之層之透濕度具有此種關係之情形時，存在容易產生上述翹曲之問題之傾向。具體而言，發現容易受所放置之環境(例如溫度)之影響。再者，所謂鄰接係指隔著接著層而相鄰。 The difference in moisture permeability at 40°C and 92%RH between the laminated portion of the layer disposed adjacent to the second main surface 11b of the polarizing element 11 and the retardation layer 20 and the first protective layer 12 is 350 g/ m 2 ·24 h or more, or 400 g/m 2 ·24 h or more, or 500 g/m 2 ·24 h or more. The inventors of the present invention have found that when the moisture permeability of the layer arranged on the first main surface side and the second main surface side of the polarizing element has such a relationship, the above-mentioned problem of warpage tends to occur easily. In particular, it was found to be easily affected by the environment in which it is placed, such as temperature. In addition, the so-called adjacency means that they are adjacent to each other through the adhesive layer.

第一保護層12之在40℃及92%RH時之透濕度例如為100 g/m 2・24 h以下，亦可為80 g/m 2・24 h以下，亦可為60 g/m 2・24 h以下。作為第一保護層12，例如包含選自由環烯烴系樹脂膜、聚烯烴系樹脂膜及(甲基)丙烯酸系樹脂膜所組成之群之至少一者。另一方面，第一保護層12之在40℃及92%RH時之透濕度例如為5 g/m 2・24 h以上。再者，於實施上述表面處理之情形時，對包含表面處理層在內之第一保護層12之透濕度進行測定。 The moisture permeability of the first protective layer 12 at 40°C and 92%RH is, for example, 100 g/m 2 ·24 h or less, or 80 g/m 2 ·24 h or less, or 60 g/m 2・Below 24 hours. The first protective layer 12 includes, for example, at least one member selected from the group consisting of a cycloolefin resin film, a polyolefin resin film, and a (meth)acrylic resin film. On the other hand, the moisture permeability of the first protective layer 12 at 40° C. and 92% RH is, for example, 5 g/m 2 ·24 h or more. Furthermore, when the above-mentioned surface treatment is performed, the water vapor transmission rate of the first protective layer 12 including the surface treatment layer is measured.

自與偏光元件11之第二主面11b鄰接而配置之層至相位差層20為止之積層部之在40℃及92%RH時之透濕度例如為400 g/m 2・24 h以上，亦可為450 g/m 2・24 h以上，亦可為500 g/m 2・24 h以上，亦可為600 g/m 2・24 h以上，亦可為700 g/m 2・24 h以上。於使用液晶化合物之配向固化層作為相位差層之情形時，可滿足此種透濕度。再者，於圖1所示之第一實施方式中，自與偏光元件11之第二主面11b鄰接而配置之層至相位差層20為止之積層部，係指自第一相位差層21至第二相位差層22為止之積層部。於圖2所示之第二實施方式中，自與偏光元件11之第二主面11b鄰接而配置之層至相位差層20為止之積層部，係指自第二保護層13至第二相位差層22為止之積層部。作為第二保護層13例如使用纖維素系樹脂膜。 The moisture permeability at 40°C and 92%RH of the laminated portion from the layer disposed adjacent to the second main surface 11b of the polarizing element 11 to the retardation layer 20 is, for example, 400 g/m 2 ·24 h or more. It can be 450 g/m 2 24 h or more, 500 g/m 2 24 h or more, 600 g/m 2 24 h or 700 g/m 2 24 h or more . Such moisture permeability can be satisfied when an alignment-cured layer of a liquid crystal compound is used as a retardation layer. Moreover, in the first embodiment shown in FIG. 1 , the laminated part from the layer arranged adjacent to the second main surface 11 b of the polarizing element 11 to the retardation layer 20 refers to the layer from the first retardation layer 21 The laminated part up to the second retardation layer 22 . In the second embodiment shown in FIG. 2 , from the layer arranged adjacent to the second main surface 11 b of the polarizing element 11 to the laminated part of the retardation layer 20 means from the second protective layer 13 to the second phase layer. The build-up part up to the difference layer 22. As the second protective layer 13, for example, a cellulose-based resin film is used.

A-4.第一保護膜 第一保護膜31可由任意之適當的材料形成。作為形成材料之具體例，可列舉：聚對苯二甲酸乙二酯(PET)、聚萘二甲酸乙二酯(PEN)、聚對苯二甲酸丁二酯(PBT)等聚酯系聚合物；二乙醯纖維素、三乙醯纖維素等纖維素系聚合物；聚碳酸酯系聚合物；聚甲基丙烯酸甲酯等(甲基)丙烯酸系聚合物；聚降冰片烯等環烯烴系聚合物。該等可單獨使用，亦可將兩種以上組合使用。 A-4. The first protective film The first protective film 31 may be formed of any appropriate material. Specific examples of forming materials include polyester-based polymers such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), and polybutylene terephthalate (PBT). Cellulose polymers such as diacetyl cellulose and triacetyl cellulose; polycarbonate polymers; (meth)acrylic polymers such as polymethyl methacrylate; cycloolefins such as polynorbornene polymer. These may be used alone or in combination of two or more.

第一保護膜在40℃及92%RH時之透濕度較佳為30 g/m 2・24 h以下，更佳為20 g/m 2・24 h以下，進而較佳為15 g/m 2・24 h以下。另一方面，第一保護膜之在40℃及92%RH時之透濕度例如為1 g/m 2・24 h以上。 The moisture permeability of the first protective film at 40°C and 92%RH is preferably 30 g/m 2 ·24 h or less, more preferably 20 g/m 2 ·24 h or less, still more preferably 15 g/m 2・Below 24 hours. On the other hand, the moisture permeability of the first protective film at 40° C. and 92% RH is, for example, 1 g/m 2 ·24 h or more.

第一保護膜之厚度較佳為10 μm～50 μm，更佳為15 μm～35 μm。The thickness of the first protective film is preferably from 10 μm to 50 μm, more preferably from 15 μm to 35 μm.

如上所述，第一保護膜31可隔著黏著劑層而貼合於偏光板10。作為黏著劑層，可採用任意之適當的構成。作為具體例，可列舉丙烯酸系黏著劑、橡膠系黏著劑、矽酮系黏著劑、聚酯系黏著劑、胺基甲酸酯系黏著劑、環氧系黏著劑、及聚醚系黏著劑。藉由調整形成黏著劑之基質樹脂之單體之種類、數量、組合及調配比、以及交聯劑之調配量、反應溫度、反應時間等，可製備具有與目的對應之所期望之特性之黏著劑。黏著劑之基質樹脂可單獨使用，亦可將兩種以上組合使用。基質樹脂較佳為丙烯酸樹脂(具體而言，黏著劑層較佳為由丙烯酸系黏著劑構成)。黏著劑層之厚度例如為5 μm～15 μm。黏著劑層之25℃時之儲存模數例如為1.0×10 5Pa～1.0×10 7Pa。 As mentioned above, the first protective film 31 can be attached to the polarizing plate 10 through the adhesive layer. Arbitrary appropriate structures can be employ|adopted as an adhesive layer. Specific examples include acrylic adhesives, rubber adhesives, silicone adhesives, polyester adhesives, urethane adhesives, epoxy adhesives, and polyether adhesives. By adjusting the type, quantity, combination and blending ratio of the monomers forming the matrix resin of the adhesive, as well as the blending amount of the crosslinking agent, reaction temperature, reaction time, etc., it is possible to prepare adhesives with desired characteristics corresponding to the purpose agent. The matrix resin of the adhesive can be used alone or in combination of two or more. The matrix resin is preferably an acrylic resin (specifically, the adhesive layer is preferably composed of an acrylic adhesive). The thickness of the adhesive layer is, for example, 5 μm˜15 μm. The storage modulus of the adhesive layer at 25°C is, for example, 1.0×10 5 Pa˜1.0×10 7 Pa.

於1個實施方式中，使用在第一保護膜上預先形成有上述黏著劑層之積層物(以下，稱為「表面保護膜」)。表面保護膜之厚度較佳為20 μm～60 μm，更佳為25 μm～45 μm。再者，如上所述，於將第一保護膜剝離之情形時，可與黏著劑層一起(連同表面保護膜一起)剝離。In one embodiment, a laminate (hereinafter referred to as "surface protection film") in which the above-mentioned adhesive layer is previously formed on the first protection film is used. The thickness of the surface protection film is preferably from 20 μm to 60 μm, more preferably from 25 μm to 45 μm. Furthermore, as described above, when peeling off the first protective film, it can be peeled together with the adhesive layer (together with the surface protective film).

A-5.第二保護膜 第二保護膜32可由任意之適當的塑膠膜構成。作為塑膠膜之具體例，可列舉聚對苯二甲酸乙二酯(PET)膜、聚乙烯膜、聚丙烯膜。如上所述，第二保護膜32可作為隔離膜發揮功能。具體而言，作為第二保護膜32，較佳為使用表面被用剝離劑塗佈之塑膠膜。作為剝離劑之具體例，可列舉矽酮系剝離劑、氟系剝離劑、丙烯酸長鏈烷基酯系剝離劑。 A-5. Second protective film The second protective film 32 can be made of any suitable plastic film. Specific examples of the plastic film include polyethylene terephthalate (PET) films, polyethylene films, and polypropylene films. As described above, the second protective film 32 can function as an isolation film. Specifically, as the second protective film 32, it is preferable to use a plastic film whose surface is coated with a release agent. Specific examples of the release agent include silicone-based release agents, fluorine-based release agents, and long-chain alkyl acrylate-based release agents.

第二保護膜在40℃及92%RH時之透濕度較佳為30 g/m 2・24 h以下，更佳為20 g/m 2・24 h以下，進而較佳為15 g/m 2・24 h以下。另一方面，第二保護膜之在40℃及92%RH時之透濕度例如為1 g/m 2・24 h以上。 The moisture permeability of the second protective film at 40°C and 92%RH is preferably 30 g/m 2 ·24 h or less, more preferably 20 g/m 2 ·24 h or less, still more preferably 15 g/m 2・Below 24 hours. On the other hand, the moisture permeability of the second protective film at 40° C. and 92% RH is, for example, 1 g/m 2 ·24 h or more.

第二保護膜之厚度較佳為20 μm～80 μm，更佳為35 μm～55 μm。The thickness of the second protective film is preferably from 20 μm to 80 μm, more preferably from 35 μm to 55 μm.

A-6.積層體之製作 積層體可藉由至少將上述偏光板與上述相位差層積層而獲得。 A-6. Fabrication of laminated body A laminated body can be obtained by laminating|stacking at least the said polarizing plate and the said retardation layer.

偏光板與相位差層之積層例如係一面以輥搬送該等，一面(藉由所謂卷對卷)進行。積層代表性的是，藉由對形成於基材之液晶配向固化層實施轉印而進行。如圖2所示，於相位差層具有積層構造之情形時，可將各相位差層依序積層(轉印)於偏光板，亦可將相位差層之積層物積層(轉印)於偏光板。The lamination of the polarizing plate and the retardation layer is carried out, for example, while conveying them with a roll (by so-called roll-to-roll). Lamination is typically performed by transferring a liquid crystal alignment solidified layer formed on a substrate. As shown in Figure 2, when the phase difference layer has a laminated structure, each phase difference layer can be laminated (transferred) on the polarizing plate in sequence, or the layered product of the phase difference layer can be laminated (transferred) on the polarizer. plate.

上述轉印例如使用活性能量線硬化型接著劑來進行。活性能量線硬化型接著劑之硬化後之厚度(接著劑層之厚度)較佳為0.4 μm以上，更佳為0.4 μm～3.0 μm，進而較佳為0.6 μm～1.5 μm。再者，例如，存在起因於用於偏光板與相位差層之積層之接著劑(具體而言，活性能量線硬化型接著劑之硬化時之收縮)，而於偏光板與相位差層之積層後產生翹曲之情形。於偏光板與相位差層之積層後產生之翹曲之方向例如向偏光板側凸出。翹曲存在沿著偏光板10(偏光元件11)之吸收軸方向產生之傾向。The above-described transfer is performed using, for example, an active energy ray-curable adhesive. The thickness of the active energy ray-curable adhesive after curing (thickness of the adhesive layer) is preferably at least 0.4 μm, more preferably 0.4 μm to 3.0 μm, and still more preferably 0.6 μm to 1.5 μm. Furthermore, for example, there is an adhesive used for lamination of a polarizing plate and a retardation layer (specifically, shrinkage during hardening of an active energy ray-curable adhesive), and the lamination of a polarizing plate and a retardation layer Afterwards, warping occurs. The direction of the warp generated after lamination of the polarizing plate and the retardation layer is, for example, protruding toward the polarizing plate side. Warpage tends to occur along the absorption axis direction of the polarizing plate 10 (polarizing element 11 ).

較佳為，偏光板與相位差層之積層於水蒸氣量(A1)為10.2 g/m 3以下之環境下進行。積層中之水蒸氣量(A1)更佳為6.0 g/m 3～10.0 g/m 3，進而較佳為8.0 g/m 3～9.5 g/m 3。藉由在水蒸氣量(A1)為此種範圍之環境下進行積層，例如下述加濕處理之效果變得明顯。積層中之此種水蒸氣量(A1)例如可藉由在溫度18℃～25℃之範圍使相對濕度根據溫度變化而實現。水蒸氣量(A1)例如於溫度為18℃之情形時，可藉由使相對濕度為65%RH以下而實現；又，例如，於溫度為20℃之情形時，可藉由使相對濕度為55%RH以下而實現；又，例如，於溫度為23℃之情形時，可藉由使相對濕度為45%RH以下而實現。再者，相對濕度之下限例如可為30%RH。 Preferably, the lamination of the polarizing plate and the retardation layer is carried out in an environment with a water vapor content (A1) of 10.2 g/m 3 or less. The water vapor content (A1) in the laminate is more preferably from 6.0 g/m 3 to 10.0 g/m 3 , and still more preferably from 8.0 g/m 3 to 9.5 g/m 3 . By performing lamination in an environment in which the amount of water vapor (A1) is within such a range, the effect of, for example, the following humidification treatment becomes apparent. Such an amount of water vapor (A1) in the laminate can be realized, for example, by changing the relative humidity according to the temperature in the range of 18°C to 25°C. For example, when the temperature is 18°C, the amount of water vapor (A1) can be achieved by making the relative humidity below 65%RH; and, for example, when the temperature is 20°C, it can be achieved by making the relative humidity 55%RH or less; and, for example, when the temperature is 23°C, it can be achieved by making the relative humidity 45%RH or less. Furthermore, the lower limit of relative humidity may be 30%RH, for example.

如上所述，於積層體進而具有上述第一保護膜、上述第二保護膜、上述其他功能層(例如，導電層、其他相位差層)之情形時，該等可於特定之位置利用任意之適當的方法積層或形成。As mentioned above, when the laminate further has the above-mentioned first protective film, the above-mentioned second protective film, and the above-mentioned other functional layers (for example, conductive layers, other retardation layers), these can be used at specific positions. Appropriate methods of lamination or formation.

於1個實施方式中，積層體係可藉由將偏光板與相位差層積層而製作積層體前驅物，且於所獲得之積層體前驅物積層第一保護膜及第二保護膜而獲得。In one embodiment, the laminated system can be obtained by laminating a polarizing plate and a retardation layer to produce a laminate precursor, and laminating a first protective film and a second protective film on the obtained laminate precursor.

上述積層體前驅物與第一保護膜之積層例如藉由將上述表面保護膜貼合而進行。積層體前驅物與第二保護膜32之積層例如使用黏著劑進行。黏著劑之厚度(配置於相位差層20與第二保護膜32之間之黏著劑層之厚度)例如為10 μm～20 μm。Lamination of the above-mentioned laminate precursor and the first protective film is carried out by bonding the above-mentioned surface protective film together, for example. Lamination of the laminate precursor and the second protective film 32 is performed using, for example, an adhesive. The thickness of the adhesive (thickness of the adhesive layer disposed between the retardation layer 20 and the second protective film 32 ) is, for example, 10 μm˜20 μm.

上述積層體可供於加濕處理。藉由對積層體實施加濕處理，而對積層體(較佳為，偏光元件)賦予水分，可矯正於上述偏光板與相位差層之積層後產生之翹曲。再者，較佳為，於下述捆包時，不會於捆包之積層體產生翹曲。The above-mentioned laminate can be used for humidification treatment. By subjecting the laminate to a humidification treatment, moisture is imparted to the laminate (preferably, a polarizing element), and warpage generated after lamination of the above-mentioned polarizing plate and retardation layer can be corrected. Furthermore, it is preferable that warping does not occur in the laminated body of the packing during the following packing.

上述加濕處理例如可藉由將積層體放置於18℃～34℃及60%RH～90%RH之環境下而進行。加濕處理時之水蒸氣量(A2)較佳為10.5 g/m 3～30 g/m 3，更佳為11 g/m 3～20 g/m 3。 The above-mentioned humidification treatment can be performed, for example, by placing the laminate in an environment of 18° C. to 34° C. and 60% RH to 90% RH. The water vapor amount (A2) during humidification treatment is preferably 10.5 g/m 3 to 30 g/m 3 , more preferably 11 g/m 3 to 20 g/m 3 .

上述加濕處理時之水蒸氣量(A2)例如於溫度為18℃之情形時，可藉由使相對濕度為80%RH以上而實現；又，例如，於溫度為20℃之情形時，可藉由使相對濕度為60%RH以上而實現；又，例如，於溫度為23℃之情形時，可藉由使相對濕度為50%RH以上而實現。再者，相對濕度之上限例如可為100%RH。The amount of water vapor (A2) during the above-mentioned humidification treatment, for example, can be achieved by making the relative humidity 80%RH or higher when the temperature is 18°C; and, for example, when the temperature is 20°C, it can be It can be realized by making the relative humidity 60%RH or more; and, for example, when the temperature is 23°C, it can be realized by making the relative humidity 50%RH or more. Furthermore, the upper limit of relative humidity may be 100%RH, for example.

於1個實施方式中，於滿足較上述水蒸氣量(A1)多之水蒸氣量之環境下對積層體實施加濕處理。更詳細而言，加濕處理時之水蒸氣量(A2)與上述水蒸氣量(A1)之差較佳為0.5 g/m 3以上，更佳為1.0 g/m 3～28 g/m 3，進而較佳為1.0 g/m 3～12 g/m 3，特佳為1.5 g/m 3～10 g/m 3，最佳為1.5 g/m 3～8 g/m 3。藉由於此種條件下進行加濕，可對積層體賦予適當量之水分。更詳細而言，可不使積層體收縮地對積層體賦予水分。於加濕處理中，若賦予至積層體之水分量過多，則例如存在產生凸出之方向與初始之翹曲相反之翹曲、及/或於面內與初始之翹曲之方向正交之方向之翹曲的情形。 In one embodiment, the laminate is subjected to a humidification treatment in an environment satisfying a water vapor amount larger than the above-mentioned water vapor amount (A1). More specifically, the difference between the water vapor amount (A2) during the humidification treatment and the aforementioned water vapor amount (A1) is preferably 0.5 g/m 3 or more, more preferably 1.0 g/m 3 to 28 g/m 3 , and more preferably 1.0 g/m 3 to 12 g/m 3 , particularly preferably 1.5 g/m 3 to 10 g/m 3 , most preferably 1.5 g/m 3 to 8 g/m 3 . By humidifying under such conditions, an appropriate amount of water can be given to the laminate. More specifically, moisture can be imparted to the laminate without causing the laminate to shrink. In the humidification process, if the amount of moisture given to the laminate is too high, for example, there may be warpage in which the direction of protrusion is opposite to the initial warpage, and/or in-plane warpage perpendicular to the direction of the initial warpage. The case of warping in the direction.

加濕處理之時間較佳為6小時以上，更佳為12小時以上，進而較佳為18小時以上。另一方面，加濕處理之時間例如48小時以下。The time for the humidification treatment is preferably at least 6 hours, more preferably at least 12 hours, and still more preferably at least 18 hours. On the other hand, the time of the humidification treatment is, for example, 48 hours or less.

B.捆包 圖3係表示將積層體捆包之狀態之一例之模式性的立體圖，圖4係圖3所示之捆包體之橫剖視圖。如圖所示，將積層體100利用捆包材110進行捆包而獲得捆包體200。具體而言，捆包體200可藉由將積層體100放入至具有開口部之袋狀之捆包材110之內部之後，將開口部封閉而獲得。於圖示例中，將放入有積層體100之袋狀之捆包材110之開口部封閉來對積層體捆包，但捆包方法並不限定於此。例如，亦可利用片狀之捆包材包裝積層體而獲得捆包體。 B. Bale Fig. 3 is a schematic perspective view showing an example of a state in which the laminate is packed, and Fig. 4 is a cross-sectional view of the packed body shown in Fig. 3 . As shown in the figure, the laminated body 100 is packed by the packing material 110, and the packing body 200 is obtained. Specifically, the packing body 200 can be obtained by putting the laminated body 100 in the inside of the bag-shaped packing material 110 which has an opening part, and closing an opening part. In the illustrated example, the opening of the bag-shaped packing material 110 in which the laminate 100 is placed is closed to pack the laminate, but the packing method is not limited to this. For example, a laminated body can be packaged with a sheet-shaped packing material to obtain a packed body.

如圖所示，將重疊複數個單片狀之積層體100而成之重疊體102利用捆包材110進行捆包。具體而言，於捆包之前，使積層體為特定尺寸之單片狀。較佳為，單片狀之積層體例如可藉由將長條狀之積層體或者積層體前驅物切斷而獲得。於圖示例中，將單片狀之積層體捆包，例如亦可將長條狀之積層體以捲取為卷狀之狀態進行捆包。As shown in the drawing, a stacked body 102 formed by stacking a plurality of single-sheet-shaped laminated bodies 100 is packed with a packing material 110 . Specifically, before packaging, the laminate is made into a single sheet of a specific size. Preferably, the monolithic laminate can be obtained, for example, by cutting a long laminate or a laminate precursor. In the illustrated example, a single sheet-shaped laminate is packaged, for example, a strip-shaped laminate may be packaged in a rolled state.

上述捆包材之熱導率為0.2 W/m・K以下，較佳為0.1 W/m・K以下，更佳為0.06 W/m・K以下，進而較佳為0.03 W/m・K以下。藉由使用此種捆包材，可使由賦予至積層體之熱所致之影響變少，而抑制於所獲得之附有相位差層之偏光板產生翹曲。另一方面，捆包材之熱導率例如為0.001 W/m・K以上。The thermal conductivity of the above packing material is 0.2 W/m・K or less, preferably 0.1 W/m・K or less, more preferably 0.06 W/m・K or less, further preferably 0.03 W/m・K or less . By using such a packing material, the influence by the heat given to a laminated body can be reduced, and generation|occurrence|production of warpage in the obtained polarizing plate with a retardation layer can be suppressed. On the other hand, the thermal conductivity of the packaging material is, for example, 0.001 W/m·K or more.

作為捆包材，代表性的是使用樹脂片材。作為樹脂片材，較佳為使用聚對苯二甲酸乙二酯(PET)、聚萘二甲酸乙二酯(PEN)、聚對苯二甲酸丁二酯(PBT)等聚酯系片材。又，作為捆包材，亦可使用在樹脂片材積層有任意之適當的層之積層片材。作為積層於樹脂片材之層，例如可列舉包含鋁、銅等金屬之金屬層、包含氧化鋁、氧化矽等氧化物之氧化物層。 捆包材之厚度例如為1 mm～6 mm。 Typically, a resin sheet is used as a packing material. As the resin sheet, polyester-based sheets such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), and polybutylene terephthalate (PBT) are preferably used. Moreover, as a packing material, the laminated sheet which laminated|stacked arbitrary appropriate layers on the resin sheet can also be used. As a layer laminated|stacked on a resin sheet, the metal layer containing metals, such as aluminum and copper, and the oxide layer containing oxides, such as aluminum oxide and silicon oxide, are mentioned, for example. The thickness of the packing material is, for example, 1 mm to 6 mm.

如圖所示，自可更確實地抑制由熱所致之影響之觀點而言，較佳為將捆包體內部密閉。As shown in the figure, it is preferable to seal the inside of the package from the viewpoint of more reliably suppressing the influence of heat.

上述捆包體可保管特定之期間。本發明之1個實施方式之附有相位差層之偏光板之保管方法包含保管上述捆包體之步驟。藉由將上述積層體利用特定之捆包材進行捆包，而於保管(包含輸送)時，可抑制於所獲得之附有相位差層之偏光板產生翹曲。如此一來，藉由本發明之實施方式獲得之附有相位差層之偏光板，例如可良好地積層於圖像顯示面板。The above-mentioned package can be stored for a specific period of time. The storage method of the polarizing plate with retardation layer which concerns on one Embodiment of this invention includes the process of storing the said package body. By bundling the above-mentioned laminate with a specific packing material, during storage (including transportation), generation of warpage in the obtained polarizing plate with a retardation layer can be suppressed. In this way, the polarizing plate with the retardation layer obtained by the embodiment of the present invention can be well laminated on an image display panel, for example.

自捆包前至保管後之偏光板與相位差層之積層部分之每單位體積之重量減少較佳為0.2%以下，更佳為0.1%以下。此種重量減少可藉由使用上述特定之捆包材抑制由熱所致之影響而達成。藉由使重量減少為此種範圍，可有效地抑制所獲得之附有相位差層之偏光板之翹曲。 [實施例] The weight loss per unit volume of the laminated portion of the polarizing plate and retardation layer from before packaging to after storage is preferably at most 0.2%, more preferably at most 0.1%. Such weight reduction can be achieved by suppressing the effects of heat by using the above-mentioned specific packing material. By reducing the weight to such a range, the warpage of the obtained polarizing plate with a retardation layer can be effectively suppressed. [Example]

以下，藉由實施例對本發明具體地進行說明，但本發明並不受該等實施例限定。再者，厚度、熱導率及透濕度係藉由下述測定方法而測定出之值。又，只要未特別明記，則實施例及比較例中之「份」及「%」為重量基準。 ＜厚度＞ 10 μm以下之厚度係使用掃描式電子顯微鏡(日本電子公司製造，製品名「JSM-7100F」)來測定。超過10 μm之厚度係使用數位式測微計(安立公司製造，製品名「KC-351C」)來測定。 ＜熱導率＞ 藉由雷射閃光測定法而求出捆包材之熱導率。具體而言，對捆包材藉由加熱雷射閃光測定法熱常數測定裝置(先進理工公司製造，製品名「TC-1200RH」)而測定20℃-70℃之熱擴散率，根據比熱・密度之相乘值算出捆包材之熱導率。 ＜透濕度＞ 藉由透濕度杯式法(JIS Z0208-1976)而求出透濕度。 Hereinafter, although an Example demonstrates this invention concretely, this invention is not limited by these Examples. In addition, thickness, thermal conductivity, and moisture permeability are the values measured by the following measuring methods. In addition, unless otherwise specified, "parts" and "%" in Examples and Comparative Examples are based on weight. ＜Thickness＞ The thickness of 10 μm or less was measured using a scanning electron microscope (manufactured by JEOL Ltd., product name "JSM-7100F"). The thickness exceeding 10 μm was measured using a digital micrometer (manufactured by Anritsu Corporation, product name "KC-351C"). ＜Thermal conductivity＞ The thermal conductivity of the packaging material was obtained by laser flash measurement. Specifically, thermal diffusivity at 20°C to 70°C was measured with a thermal constant measuring device (manufactured by Advanced Technology Co., Ltd., product name "TC-1200RH") for the packaging material. The multiplied value calculates the thermal conductivity of the packing material. ＜Moisture permeability＞ The moisture permeability was determined by the moisture permeability cup method (JIS Z0208-1976).

[實施例1] (偏光板之製作) 作為熱塑性樹脂基材，使用長條狀、Tg約75℃之非晶質之間苯二甲酸共聚合聚對苯二甲酸乙二酯膜(厚度：100 μm)，對該樹脂基材之單面實施電暈處理。 將對聚乙烯醇(聚合度4200，皂化度99.2莫耳%)及乙醯乙醯基改性PVA(日本合成化學工業公司製造，商品名「GOHSEFIMER」)以9：1混合而成之PVA系樹脂100重量份添加碘化鉀13重量份而成者溶解於水中，製備PVA水溶液(塗佈液)。 藉由在樹脂基材之電暈處理面塗佈上述PVA水溶液並以60℃進行乾燥，而形成厚度13 μm之PVA系樹脂層，製作積層體。 將所獲得之積層體於130℃之烘箱內在縱方向(長度方向)單軸延伸(空中輔助延伸處理)至2.4倍。 繼而，使積層體於液溫40℃之不溶化浴(相對於水100重量份調配硼酸4重量份而獲得之硼酸水溶液)中浸漬30秒鐘(不溶化處理)。 繼而，將積層體以最終獲得之偏光元件之單體透過率(Ts)成為所期望之值的方式一面調整濃度，一面於液溫30℃之染色浴(相對於水100重量份將碘與碘化鉀以1：7之重量比調配而獲得之碘水溶液)中浸漬60秒鐘(染色處理)。 繼而，將積層體於液溫40℃之交聯浴(相對於水100重量份調配碘化鉀3重量份、調配硼酸5重量份而獲得之硼酸水溶液)中浸漬30秒鐘(交聯處理)。 然後，將積層體一面浸漬於液溫70℃之硼酸水溶液(硼酸濃度4重量%，碘化鉀濃度5重量%)，一面於周速不同之輥間在縱方向(長度方向)以總延伸倍率成為5.5倍之方式進行單軸延伸(水中延伸處理)。 然後，將積層體浸漬於液溫20℃之洗淨浴(相對於水100重量份調配碘化鉀4重量份而獲得之水溶液)中(洗淨處理)。 然後，將積層體一面於保持在約90℃之烘箱中進行乾燥，一面接觸於表面溫度保持在約75℃之SUS製之加熱輥(乾燥收縮處理)。 如此一來，於樹脂基材上形成厚度約5 μm之偏光元件，獲得具有樹脂基材/偏光元件之構成之積層體。 [Example 1] (Production of Polarizing Plate) As the thermoplastic resin substrate, a long amorphous isophthalic acid copolymerized polyethylene terephthalate film (thickness: 100 μm) with a Tg of about 75°C was used. Implement corona treatment. PVA system made by mixing polyvinyl alcohol (polymerization degree 4200, saponification degree 99.2 mole%) and acetoacetyl modified PVA (manufactured by Nippon Synthetic Chemical Industry Co., Ltd., trade name "GOHSEFIMER") at a ratio of 9:1 What added 100 weight part of resins and 13 weight part of potassium iodide was dissolved in water, and the PVA aqueous solution (coating liquid) was prepared. The above-mentioned PVA aqueous solution was applied to the corona-treated surface of the resin substrate and dried at 60° C. to form a PVA-based resin layer with a thickness of 13 μm, thereby producing a laminate. The obtained laminate was uniaxially stretched (in-air assisted stretching treatment) to 2.4 times in the longitudinal direction (longitudinal direction) in an oven at 130°C. Next, the laminated body was immersed for 30 seconds in an insolubilization bath (an aqueous solution of boric acid prepared by mixing 4 parts by weight of boric acid with respect to 100 parts by weight of water) at a liquid temperature of 40° C. (insolubilization treatment). Next, while adjusting the concentration so that the single transmittance (Ts) of the finally obtained polarizing element becomes a desired value, the laminate is placed in a dyeing bath at a liquid temperature of 30°C (iodine and potassium iodide to 100 parts by weight of water Immerse in an iodine aqueous solution prepared at a weight ratio of 1:7 for 60 seconds (dyeing treatment). Next, the laminate was immersed in a crosslinking bath (a boric acid aqueous solution obtained by mixing 3 parts by weight of potassium iodide and 5 parts by weight of boric acid with respect to 100 parts by weight of water) at a liquid temperature of 40° C. for 30 seconds (crosslinking treatment). Then, the laminated body was immersed in a boric acid aqueous solution (boric acid concentration: 4% by weight, potassium iodide concentration: 5% by weight) at a liquid temperature of 70°C, and placed between rollers with different peripheral speeds in the longitudinal direction (lengthwise direction) at a total stretch ratio of 5.5. Doubling method for uniaxial stretching (stretching treatment in water). Then, the laminate was immersed in a cleaning bath (an aqueous solution obtained by mixing 4 parts by weight of potassium iodide with respect to 100 parts by weight of water) at a liquid temperature of 20° C. (washing treatment). Then, the laminated body was dried in an oven kept at about 90° C., and was brought into contact with a heating roller made of SUS whose surface temperature was kept at about 75° C. (drying shrinkage treatment). In this way, a polarizing element with a thickness of about 5 μm was formed on the resin substrate to obtain a laminate having a composition of resin substrate/polarizing element.

於所獲得之積層體之偏光元件側，經由紫外線硬化型接著劑而貼合HC-COP膜(在40℃及92%RH時之透濕度30 g/m 2・24 h，厚度27 μm)作為第一保護層。再者，HC-COP膜係於環烯烴系樹脂(COP)膜(厚度25 μm)形成有HC層(厚度2 μm)之膜，以COP膜成為偏光元件側之方式貼合。繼而，自偏光元件剝離樹脂基材而獲得具有HC-COP膜(第一保護層)/偏光元件之構成之偏光板。 On the polarizing element side of the obtained laminate, an HC-COP film (water vapor transmission rate at 40°C and 92%RH: 30 g/m 2 ·24 h, thickness 27 μm) was attached via a UV-curable adhesive as First layer of protection. In addition, the HC-COP film is a film in which an HC layer (2 μm in thickness) is formed on a cycloolefin-based resin (COP) film (25 μm in thickness), and the COP film is bonded so that the polarizer side faces. Then, the resin base material was peeled off from the polarizing element, and the polarizing plate which has the structure of HC-COP film (1st protective layer)/polarizing element was obtained.

(相位差層之製作) 將顯示向列液晶相之聚合性液晶(BASF公司製造：商品名「Paliocolor LC242」，由下述式表示)10 g、與相對於該聚合性液晶化合物之光聚合起始劑(BASF公司製造：商品名「Irgacure907」)3 g溶解於甲苯40 g，製備液晶組合物(塗佈液)。 [化1]

Figure 02_image001
(Preparation of Retardation Layer) 10 g of a polymerizable liquid crystal exhibiting a nematic liquid crystal phase (manufactured by BASF Corporation: trade name "Paliocolor LC242", represented by the following formula) was prepared by photopolymerizing with respect to the polymerizable liquid crystal compound. 3 g of an initiator (manufactured by BASF Corporation: trade name "Irgacure 907") was dissolved in 40 g of toluene to prepare a liquid crystal composition (coating liquid). [chemical 1]
Figure 02_image001

將聚對苯二甲酸乙二酯(PET)膜(厚度38 μm)表面使用摩擦布摩擦來實施配向處理。配向處理之方向，在貼合於偏光板時相對於偏光元件之吸收軸之方向自視認側觀察成為15°方向。於該配向處理表面，藉由棒式塗佈機而塗佈上述液晶塗佈液，藉由以90℃加熱乾燥2分鐘而使液晶化合物配向。對如此形成之液晶層使用金屬鹵化物燈照射1 mJ/cm 2之光，使該液晶層硬化，藉此，於PET膜上形成液晶配向固化層A(H層)。液晶配向固化層A之厚度為2.5 μm，面內相位差Re(550)為270 nm。進而，液晶配向固化層A顯示nx＞ny＝nz之折射率特性。 The surface of a polyethylene terephthalate (PET) film (38 μm in thickness) was rubbed with a rubbing cloth to perform an alignment treatment. The direction of the alignment treatment is a direction of 15° when viewed from the viewing side relative to the direction of the absorption axis of the polarizing element when it is attached to the polarizing plate. On this alignment-treated surface, the above-mentioned liquid crystal coating liquid was coated with a bar coater, and the liquid crystal compound was aligned by heating and drying at 90° C. for 2 minutes. The thus formed liquid crystal layer was irradiated with light of 1 mJ/cm 2 using a metal halide lamp to harden the liquid crystal layer, thereby forming a liquid crystal alignment solidified layer A (H layer) on the PET film. The thickness of the liquid crystal alignment solidified layer A is 2.5 μm, and the in-plane retardation Re(550) is 270 nm. Furthermore, the liquid crystal alignment solidified layer A exhibits a refractive index characteristic of nx>ny=nz.

變更塗佈厚度，及使配向處理方向相對於偏光元件之吸收軸之方向自視認側觀察成為75°方向，除此以外與上述相同地，於PET膜上形成液晶配向固化層B(Q層)。液晶配向固化層B之厚度為1.5 μm，面內相位差Re(550)為140 nm。進而，液晶配向固化層B顯示nx＞ny＝nz之折射率特性。Change the coating thickness, and make the direction of the alignment treatment relative to the direction of the absorption axis of the polarizer to be 75° when viewed from the viewing side, and form the liquid crystal alignment solidified layer B (Q layer) on the PET film in the same way as above . The thickness of the liquid crystal alignment solidified layer B is 1.5 μm, and the in-plane retardation Re(550) is 140 nm. Furthermore, the liquid crystal alignment solidified layer B exhibits a refractive index characteristic of nx>ny=nz.

(積層體之製作) 於所獲得之偏光板之偏光元件側，依次轉印所獲得之液晶配向固化層A(H層)及液晶配向固化層B(Q層)。此時，以偏光元件之吸收軸與液晶配向固化層A之遲相軸所成之角度為15°、偏光元件之吸收軸與液晶配向固化層B之遲相軸所成之角度為75°之方式進行轉印(貼合)。各轉印經由紫外線硬化型接著劑(厚度1.0 μm)而進行。如此一來，獲得積層體前驅物。再者，轉印(貼合)係一面以輥搬送一面進行。進而，轉印(貼合)係於水蒸氣量為9.3 g/m 3之環境下(23℃及45%RH)進行。 所獲得之積層體前驅物之總厚度為36 μm，厚度比為8。又，自液晶配向固化層A至液晶配向固化層B之積層部之在40℃及92%RH時之透濕度為500 g/m 2・24 h。 (Preparation of Laminate) The obtained liquid crystal alignment solidified layer A (H layer) and liquid crystal alignment solidified layer B (Q layer) were sequentially transferred to the polarizing element side of the obtained polarizing plate. At this time, the angle formed by the absorption axis of the polarizer and the slow axis of the liquid crystal alignment solidified layer A is 15°, and the angle formed by the absorption axis of the polarizer and the slow axis of the liquid crystal alignment solidified layer B is 75°. Transfer printing (lamination) in a certain way. Each transfer was performed via an ultraviolet curable adhesive (thickness: 1.0 μm). In this way, a laminate precursor is obtained. In addition, transfer (bonding) was performed while being conveyed by a roller. Furthermore, the transfer (bonding) was carried out in an environment (23° C. and 45% RH) with a water vapor volume of 9.3 g/m 3 . The total thickness of the obtained laminate precursor was 36 μm, and the thickness ratio was 8. In addition, the moisture permeability at 40°C and 92%RH of the layered part from the liquid crystal alignment solidified layer A to the liquid crystal alignment solidified layer B is 500 g/m 2 ·24 h.

繼而，於積層體前驅物之偏光板之第一保護層側貼合表面保護膜(厚度38 μm)。再者，表面保護膜係於PET系膜(厚度28 μm，透濕度20 g/m 2・24 h)形成有黏著劑層(厚度10 μm)之膜。 進而，於積層體前驅物之液晶配向固化層B(Q層)側，隔著黏著劑層(厚度15 μm)來貼合隔離膜(厚度38 μm，透濕度20 g/m 2・24 h)而獲得積層體。 Next, a surface protective film (thickness: 38 μm) was attached to the first protective layer side of the polarizing plate of the laminate precursor. In addition, the surface protection film is a film with an adhesive layer (thickness 10 μm) formed on a PET film (thickness 28 μm, moisture permeability 20 g/m 2 ·24 h). Furthermore, on the liquid crystal alignment solidified layer B (Q layer) side of the laminate precursor, a separator (thickness 38 μm, moisture permeability 20 g/m 2・24 h) was attached via an adhesive layer (thickness 15 μm) To obtain a laminate.

將所獲得之長條狀之積層體沿著相對於長度方向及寬度方向(與長度方向正交之方向)為45°之方向切斷，獲得144 mm×73 mm之單片狀之積層體。再者，長度方向相當於偏光元件之吸收軸方向。 以相同之方式製作合計200片之144 mm×73 mm之單片狀之積層體。 The obtained elongated laminate was cut along a direction at 45° with respect to the longitudinal direction and the width direction (direction perpendicular to the longitudinal direction) to obtain a single-sheet laminate of 144 mm×73 mm. Furthermore, the longitudinal direction corresponds to the absorption axis direction of the polarizer. A total of 200 single-sheet laminates of 144 mm×73 mm were fabricated in the same manner.

(加濕處理) 對所獲得之200片之單片狀之積層體實施加濕處理。加濕處理係以23℃及60%RH(水蒸氣量為12.4 g/m 3)進行24小時。 (Humidification treatment) Humidification treatment was performed on the obtained 200 sheet-like laminates. Humidification treatment was carried out at 23°C and 60%RH (water vapor volume: 12.4 g/m 3 ) for 24 hours.

(捆包) 於具有開口部之袋狀之捆包材(PET系片材，熱導率0.01～0.03 W/m・K，厚度4mm)之內部放入200片加濕處理後之積層體之後，將捆包材之開口部封閉而獲得捆包體。 (bale) Put 200 sheets of humidified laminates inside a bag-shaped packaging material (PET-based sheet, thermal conductivity 0.01-0.03 W/m・K, thickness 4mm) with an opening, and pack the package The opening of the material is closed to obtain a package.

將所獲得之捆包體於40℃之環境下保管10小時。如此一來，獲得附有相位差層之偏光板。The obtained package was stored in an environment of 40° C. for 10 hours. In this way, a polarizing plate with a retardation layer was obtained.

[實施例2] 藉由下述所示之方法獲得偏光板，及於所獲得之偏光板之第二保護層側積層相位差層而獲得積層體，除此以外與實施例1相同地，獲得附有相位差層之偏光板。 [Example 2] A polarizing plate was obtained by the method shown below, and a retardation layer was laminated on the second protective layer side of the obtained polarizing plate to obtain a laminate. In the same manner as in Example 1, a retardation layer was obtained. The polarizer.

(偏光板之製作) 將厚度30 μm之聚乙烯醇(PVA)系樹脂膜(可樂麗製造，製品名「PE3000」)之長條卷在藉由輥延伸機以於長度方向成為5.9倍之方式沿長度方向單軸延伸之同時，依次實施膨潤、染色、交聯、洗淨處理之後，最後實施乾燥處理，藉此製作厚度12 μm之偏光元件。 上述膨潤處理係一面以20℃之純水進行處理一面延伸至2.2倍。繼而，染色處理係一面於以獲得之偏光元件之單體透過率成為45.0%之方式對碘濃度進行調整之碘與碘化鉀之重量比為1：7的30℃之水溶液中進行處理，一面延伸至1.4倍。繼而，交聯處理係採用2階段之交聯處理，第1階段之交聯處理係一面於40℃之溶解有硼酸與碘化鉀之水溶液中進行處理，一面延伸至1.2倍。第1階段之交聯處理之水溶液之硼酸含量為5.0重量%，碘化鉀含量為3.0重量%。第2階段之交聯處理係一面於65℃之溶解有硼酸與碘化鉀之水溶液中進行處理，一面延伸至1.6倍。第2階段之交聯處理之水溶液之硼酸含量為4.3重量%，碘化鉀含量為5.0重量%。繼而，洗淨處理係於20℃之碘化鉀水溶液中進行處理。洗淨處理之水溶液之碘化鉀含量為2.6重量%。最後，以70℃乾燥處理5分鐘而獲得偏光元件。 (Production of Polarizing Plate) A long strip of polyvinyl alcohol (PVA)-based resin film (manufactured by Kuraray, product name "PE3000") with a thickness of 30 μm is rolled and uniaxially stretched in the longitudinal direction by a roll stretcher so as to be 5.9 times the longitudinal direction. Simultaneously, swelling, dyeing, cross-linking, and washing were performed sequentially, and finally drying was performed to produce a polarizing element with a thickness of 12 μm. The above-mentioned swelling treatment was extended to 2.2 times while being treated with pure water at 20°C. Next, the dyeing treatment was carried out in an aqueous solution at 30°C whose weight ratio of iodine and potassium iodide was adjusted to be 1:7 so that the single transmittance of the obtained polarizing element became 45.0%. 1.4 times. Then, the cross-linking treatment is a two-stage cross-linking treatment. The first-stage cross-linking treatment is performed in an aqueous solution of boric acid and potassium iodide dissolved at 40° C., and extended to 1.2 times. The boric acid content of the aqueous solution of the crosslinking treatment in the first stage was 5.0% by weight, and the content of potassium iodide was 3.0% by weight. The cross-linking treatment in the second stage is carried out in an aqueous solution of boric acid and potassium iodide dissolved at 65° C., while extending to 1.6 times. The boric acid content of the aqueous solution of the second-stage crosslinking treatment was 4.3% by weight, and the content of potassium iodide was 5.0% by weight. Next, washing treatment was carried out in a potassium iodide aqueous solution at 20°C. The potassium iodide content of the aqueous solution of washing|cleaning process was 2.6 weight%. Finally, a polarizing element was obtained by drying at 70° C. for 5 minutes.

於上述偏光元件之單側，貼合HC-COP膜(在40℃及92%RH時之透濕度20 g/m 2・24 h，厚度29 μm)作為第一保護層。再者，HC-COP膜係於環烯烴系樹脂(COP)膜(厚度26 μm)形成有HC層(厚度3 μm)之膜，以COP膜成為偏光元件側之方式貼合。繼而，於偏光元件之另一單側，貼合Re(550)為0 nm之TAC膜(厚度20 μm)作為第二保護層。如此一來，獲得具有HC-COP膜(第一保護層)/偏光元件/TAC膜(第二保護層)之構成之偏光板。 On one side of the above-mentioned polarizing element, stick HC-COP film (at 40°C and 92%RH, the moisture permeability is 20 g/ m2 ·24 h, the thickness is 29 μm) as the first protective layer. In addition, the HC-COP film is a film in which an HC layer (3 μm in thickness) is formed on a cycloolefin-based resin (COP) film (26 μm in thickness), and the COP film is bonded so that the polarizer side faces. Then, on the other side of the polarizing element, a TAC film (thickness 20 μm) with Re(550) of 0 nm was pasted as the second protective layer. In this way, a polarizing plate having a composition of HC-COP film (first protective layer)/polarizer/TAC film (second protective layer) was obtained.

自TAC膜至液晶配向固化層B為止之積層部之在40℃及92%RH時之透濕度為600 g/m 2・24 h。 The moisture permeability of the lamination part from the TAC film to the liquid crystal alignment solidified layer B at 40°C and 92%RH is 600 g/m 2 ·24 h.

[比較例1] 於捆包時，使用具有開口部之袋狀之捆包材(聚乙烯片材，熱導率0.3～0.4 W/m・K，厚度500 μm)，除此以外，與實施例1相同地獲得附有相位差層之偏光板。 [Comparative example 1] When packing, use a bag-shaped packing material (polyethylene sheet, thermal conductivity 0.3 to 0.4 W/m·K, thickness 500 μm) with an opening, except that it is obtained in the same manner as in Example 1. Polarizing plate with retardation layer.

[比較例2] 除了不將積層體捆包以外，與實施例1相同地獲得附有相位差層之偏光板。 [Comparative example 2] A polarizing plate with a retardation layer was obtained in the same manner as in Example 1 except that the laminate was not packaged.

[參考例1] 於製作偏光板時，使用HC-TAC膜(在40℃及92%RH時之透濕度600 g/m 2・24 h，厚度32 μm)代替HC-COP膜作為第一保護層，及不將積層體捆包，除此以外，與實施例1相同地獲得附有相位差層之偏光板。再者，HC-TAC膜係於TAC膜(厚度25 μm)形成有HC層(厚度7 μm)之膜，以TAC膜成為偏光元件側之方式貼合。 [Reference Example 1] When making a polarizing plate, use HC-TAC film (at 40°C and 92%RH, moisture permeability 600 g/ m2 ·24 h, thickness 32 μm) instead of HC-COP film as the first protection A polarizing plate with a retardation layer was obtained in the same manner as in Example 1 except that the laminate was not packaged. In addition, the HC-TAC film is a film in which the HC layer (7 μm in thickness) was formed on the TAC film (25 μm in thickness), and was bonded so that the TAC film was on the polarizer side.

[參考例2] 於製作偏光板時，使用HC-TAC膜(在40℃及92%RH時之透濕度600 g/m 2・24 h，厚度32 μm)代替HC-COP膜作為第一保護層，及不將積層體捆包，除此以外，與實施例2相同地獲得附有相位差層之偏光板。再者，HC-TAC膜係於TAC膜(厚度25 μm)形成有HC層(厚度7 μm)之膜，以TAC膜成為偏光元件側之方式貼合。 [Reference Example 2] When making a polarizing plate, use HC-TAC film (at 40°C and 92%RH, moisture permeability 600 g/m 2 ·24 h, thickness 32 μm) instead of HC-COP film as the first protection A polarizing plate with a retardation layer was obtained in the same manner as in Example 2 except that the laminate was not packaged. In addition, the HC-TAC film is a film in which the HC layer (7 μm in thickness) was formed on the TAC film (25 μm in thickness), and was bonded so that the TAC film was on the polarizer side.

對實施例及比較例進行下述評估。評估結果彙總於表1。 ＜評估＞ 1.翹曲之變化量 於實施例及比較例中，使用保管(捆包)前之積層體及附有相位差層之偏光板作為試驗片。測定將試驗片以其相位差層側成為平面側之方式靜置於平面上時之距平面最高之部分的高度，求出翹曲量。此處，對於翹曲，將向靜置面側凸出之情形設為「正(+)」，將向與靜置面為相反側凸出之情形設為「負(-)」。 繼而，求出附有相位差層之偏光板之翹曲量與保管(捆包)前之積層體之翹曲量的差(翹曲之變化量)。再者，表1中記載之值為12片之值之平均值。 2.偏光板與相位差層之積層部分之每單位體積之重量變化 於實施例及比較例中，測定保管(捆包)前之積層體及附有相位差層之偏光板之重量，且測定表面保護膜及隔離膜(包含黏著劑層)之重量，利用下述式算出重量變化(%)。再者，表1中記載之值為測定出之樣品之最小值與最大值。 (保管前之積層體之重量－附有相位差層之偏光板之重量)/(保管前之積層體之重量－表面保護膜及隔離膜(包含黏著劑層)之重量)×100 The following evaluations were performed on Examples and Comparative Examples. The evaluation results are summarized in Table 1. ＜Evaluation＞ 1. Variation of warpage In Examples and Comparative Examples, the laminate before storage (packaging) and the polarizing plate with the retardation layer were used as test pieces. The height of the highest part from the plane when the test piece was placed on the plane so that the retardation layer side became the plane side was measured, and the amount of warpage was obtained. Here, regarding the warpage, the case where it bulges toward the static surface side is defined as "positive (+)", and the case where it bulges toward the side opposite to the static surface is defined as "negative (-)". Next, the difference between the amount of warpage of the polarizing plate with a retardation layer and the amount of warpage of the laminate before storage (packaging) (the amount of change in warpage) was obtained. In addition, the value described in Table 1 is the average value of the value of 12 sheets. 2. The weight change per unit volume of the laminated part of the polarizing plate and the retardation layer In Examples and Comparative Examples, the weight of the laminate and the polarizing plate with the retardation layer before storage (packaging), and the weight of the surface protection film and the separator (including the adhesive layer) were measured using the following Formula to calculate the weight change (%). In addition, the values recorded in Table 1 are the minimum and maximum values of the measured samples. (The weight of the laminate before storage - the weight of the polarizing plate with the retardation layer)/(the weight of the laminate before storage - the weight of the surface protection film and the isolation film (including the adhesive layer)) × 100

[表1]    實施例1 實施例2 比較例1 比較例2 捆包材之熱導率 (W/m·K) 0.01-0.03 0.01-0.03 0.3-0.4 - 翹曲之變化量 (mm) 5 5 25 40 重量變化 (%) 0.05-0.2 0.05-0.2 0.3-0.5 0.4-0.6 [Table 1] Example 1 Example 2 Comparative example 1 Comparative example 2 Thermal conductivity of packing material (W/m·K) 0.01-0.03 0.01-0.03 0.3-0.4 - Variation of Warpage (mm) 5 5 25 40 Weight change (%) 0.05-0.2 0.05-0.2 0.3-0.5 0.4-0.6

於實施例中，翹曲得到抑制。再者，藉由保管而翹曲之方向變化為(-)方向。 於參考例1、2中，實質上未確認到保管前後之翹曲之變化。 [產業上之可利用性] In the examples, warpage is suppressed. In addition, the direction of warping by storage changes to (-) direction. In Reference Examples 1 and 2, substantially no change in warpage before and after storage was observed. [Industrial availability]

本發明之1個實施方式之附有相位差層之偏光板用作圖像顯示裝置之附有相位差層之偏光板，尤其，可較佳地用於能夠彎曲或者屈曲、摺疊、或捲取之圖像顯示裝置。作為圖像顯示裝置，代表性的是，可列舉液晶顯示裝置、有機EL顯示裝置、無機EL顯示裝置。The polarizing plate with a retardation layer according to one embodiment of the present invention is used as a polarizing plate with a retardation layer for an image display device, and in particular, it can be preferably used for bending or bending, folding, or rolling. image display device. Representative examples of image display devices include liquid crystal display devices, organic EL display devices, and inorganic EL display devices.

10:偏光板 11:偏光元件 11a:第一主面 11b:第二主面 12:第一保護層 13:第二保護層 20:相位差層 21:第一相位差層 22:第二相位差層 31:第一保護膜 32:第二保護膜 100:積層體 102:重疊體 110:捆包材 200:捆包體 10: polarizer 11: Polarizing element 11a: the first main surface 11b: Second main surface 12: The first protective layer 13: Second protective layer 20: Retardation layer 21: The first retardation layer 22: The second retardation layer 31: The first protective film 32:Second protective film 100: laminated body 102: Overlap 110: packing material 200: Bale body

圖1係表示本發明之第一實施方式之積層體之概略構成之模式性的剖視圖。 圖2係表示本發明之第二實施方式之積層體之概略構成之模式性的剖視圖。 圖3係表示將積層體捆包之狀態之一例之模式性的立體圖。 圖4係圖3所示之捆包體之橫剖視圖。 FIG. 1 is a schematic cross-sectional view showing a schematic configuration of a laminate according to a first embodiment of the present invention. Fig. 2 is a schematic cross-sectional view showing a schematic configuration of a laminate according to a second embodiment of the present invention. Fig. 3 is a schematic perspective view showing an example of a state in which laminates are packed. Fig. 4 is a cross-sectional view of the packing body shown in Fig. 3 .

100:積層體 100: laminated body

102:重疊體 102: Overlap

110:捆包材 110: packing material

200:捆包體 200: Bale body

Claims (14)

一種附有相位差層之偏光板之製造方法，其包含如下步驟： 準備具有偏光板及相位差層之積層體，該偏光板包含具有相互對向之第一主面及第二主面之偏光元件與配置於上述偏光元件之上述第一主面側之第一保護層，該相位差層配置於上述偏光元件之上述第二主面側； 利用熱導率為0.2 W/m・K以下之捆包材將上述積層體捆包而獲得捆包體；及 保管上述捆包體； 自與上述偏光元件之上述第二主面鄰接而配置之層至上述相位差層為止之積層部、與上述第一保護層之在40℃及92%RH時之透濕度之差為350 g/m 2・24 h以上。 A method of manufacturing a polarizing plate with a retardation layer, comprising the steps of: preparing a laminate having a polarizing plate and a retardation layer, the polarizing plate comprising polarized light having a first main surface and a second main surface facing each other The element and the first protective layer arranged on the first main surface side of the above-mentioned polarizing element, and the phase difference layer is arranged on the second main surface side of the above-mentioned polarizing element; A packing material obtained by packing the above-mentioned layered body; and storing the above-mentioned packaged body; The difference between the moisture permeability of the first protective layer at 40°C and 92%RH is more than 350 g/m 2 ·24 h. 如請求項1之製造方法，其中上述第一保護層之在40℃及92%RH時之透濕度為100 g/m 2・24 h以下。 The manufacturing method according to claim 1, wherein the moisture permeability of the above-mentioned first protective layer at 40°C and 92%RH is 100 g/m 2 ·24 h or less. 如請求項1或2之製造方法，其中上述積層部之在40℃及92%RH時之透濕度為400 g/m 2・24 h以上。 The manufacturing method according to claim 1 or 2, wherein the moisture permeability of the above-mentioned laminated part at 40°C and 92%RH is 400 g/m 2 ·24 h or more. 如請求項1至3中任一項之製造方法，其中上述偏光板具有配置於上述偏光元件與上述相位差層之間之第二保護層。The manufacturing method according to any one of claims 1 to 3, wherein the polarizing plate has a second protective layer disposed between the polarizing element and the retardation layer. 如請求項1至4中任一項之製造方法，其中上述相位差層係液晶化合物之配向固化層。The manufacturing method according to any one of claims 1 to 4, wherein the retardation layer is an alignment solidified layer of a liquid crystal compound. 如請求項1至5中任一項之製造方法，其中上述相位差層具有兩層以上之積層構造。The manufacturing method according to any one of claims 1 to 5, wherein the retardation layer has a laminated structure of two or more layers. 如請求項1至6中任一項之製造方法，其中上述積層體依次具有第一保護膜、上述偏光板、上述相位差層、及第二保護膜。The manufacturing method according to any one of claims 1 to 6, wherein the laminate has the first protective film, the polarizing plate, the retardation layer, and the second protective film in this order. 如請求項7之製造方法，其中上述第一保護膜之在40℃及92%RH時之透濕度為30 g/m 2・24 h以下。 The manufacturing method according to claim 7, wherein the moisture permeability of the above-mentioned first protective film at 40°C and 92%RH is 30 g/m 2 ·24 h or less. 如請求項7或8之製造方法，其中上述第二保護膜之在40℃及92%RH時之透濕度為30 g/m 2・24 h以下。 The manufacturing method according to claim 7 or 8, wherein the moisture permeability of the second protective film at 40°C and 92%RH is 30 g/m 2 ·24 h or less. 如請求項1至9中任一項之製造方法，其中將單片狀之上述積層體捆包而獲得上述捆包體。The manufacturing method according to any one of claims 1 to 9, wherein the packaged body is obtained by packing the above-mentioned laminated body in the form of a single sheet. 如請求項1至10中任一項之製造方法，其中上述偏光板之厚度與上述相位差層之厚度之合計為83 μm以下。The manufacturing method according to any one of claims 1 to 10, wherein the sum of the thickness of the polarizing plate and the thickness of the retardation layer is 83 μm or less. 如請求項1至11中任一項之製造方法，其包含將上述偏光板與上述相位差層使用活性能量線硬化型接著劑積層之步驟。The manufacturing method according to any one of claims 1 to 11, which includes the step of laminating the polarizing plate and the retardation layer with an active energy ray-curable adhesive. 如請求項1至12中任一項之製造方法，其包含在上述捆包前對上述積層體實施加濕處理之步驟。The manufacturing method according to any one of claims 1 to 12, which includes the step of performing a humidification treatment on the above-mentioned laminate before the above-mentioned packaging. 一種附有相位差層之偏光板之保管方法，其包含如下步驟： 準備具有偏光板及相位差層之積層體，該偏光板包含具有相互對向之第一主面及第二主面之偏光元件與配置於上述偏光元件之上述第一主面側之第一保護層，該相位差層配置於上述偏光元件之上述第二主面側； 利用熱導率為0.2 W/m・K以下之捆包材將上述積層體捆包而獲得捆包體；及 保管上述捆包體； 自與上述偏光元件之上述第二主面鄰接而配置之層至上述相位差層為止之積層部、與上述第一保護層之在40℃及92%RH時之透濕度之差為350 g/m 2・24 h以上。 A storage method for a polarizing plate with a retardation layer, comprising the steps of: preparing a laminate having a polarizing plate and a retardation layer, the polarizing plate comprising polarized light having a first principal surface and a second principal surface opposite to each other The element and the first protective layer arranged on the first main surface side of the above-mentioned polarizing element, and the phase difference layer is arranged on the second main surface side of the above-mentioned polarizing element; A packing material obtained by packing the above-mentioned layered body; and storing the above-mentioned packaged body; The difference between the moisture permeability of the first protective layer at 40°C and 92%RH is more than 350 g/m 2 ·24 h.
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