TWI681874B - Composite polarizing plate and liquid crystal panel using the polarizing plate - Google Patents

Abstract

This invention provides a composite polarizing plate with small decrease of polarization degree under high temperature, and a liquid crystal panel with high thermal resistance.

The composite polarizing plate are composed by laminating a first protective film, a first polarizing film with a thickness of 15 μ m or less, and a second polarizing film with a thickness of 15 μ m or less in this order, wherein the absorption axis of the first polarizing film is roughly parallel to the absorption axis of the second polarizing film.

Description

複合偏光板及使用該偏光板之液晶面板 Composite polarizing plate and liquid crystal panel using the polarizing plate

本發明係關於耐久性優異之複合偏光板、以及使用該偏光板之液晶面板。 The present invention relates to a composite polarizing plate excellent in durability and a liquid crystal panel using the polarizing plate.

近年來，液晶顯示裝置係活用其消費電力少、於低電壓下運作、輕量且薄型之優點，作為行動電話、攜帶式情報終端、電腦用顯示器、電視等情報用顯示裝置而迅速地普及。伴隨液晶技術的發展，提案有多種模式之液晶顯示裝置，響應速度及對比、窄視角等液晶顯示之問題點逐漸被解決。如此情況之中，液晶顯示裝置也在車載用途等要求有高耐久性之領域發展。然而，對於如溫度95℃之嚴苛耐久試驗，在使用以往的經碘將聚乙烯醇系樹脂染色之偏光板會有偏光度降低程度大之問題。 In recent years, liquid crystal display devices have taken advantage of the advantages of low power consumption, operation at low voltage, light weight, and thinness, and they have rapidly spread as information display devices for mobile phones, portable information terminals, computer monitors, and televisions. With the development of liquid crystal technology, liquid crystal display devices with multiple modes have been proposed, and the problems of liquid crystal display such as response speed and contrast, narrow viewing angle have been gradually solved. Under such circumstances, liquid crystal display devices are also developing in fields requiring high durability, such as in-vehicle applications. However, for a severe endurance test such as a temperature of 95° C., the polarizing plate using a conventional polyvinyl alcohol-based resin dyed with iodine has a problem that the degree of polarization is greatly reduced.

日本特開2002-072162號公報(專利文獻1)中，揭示在投影型顯示裝置之光射出側使用2片偏光板之構成，但為了將偏光板冷卻而將2片偏光板以空間上分離之方式配置。當採用使冷卻用氣體通過2片偏光板之間、或者將熱傳導度高之藍寶石或水晶夾在2片偏光板之間之 構成時，在空氣層或水晶等界面中，由折射率差所致之反射大，會有光的利用效率降低之問題。 Japanese Unexamined Patent Publication No. 2002-072162 (Patent Document 1) discloses a configuration in which two polarizing plates are used on the light exit side of a projection-type display device, but in order to cool the polarizing plates, the two polarizing plates are spatially separated Way configuration. When a cooling gas is passed between two polarizing plates, or a sapphire or crystal with high thermal conductivity is sandwiched between two polarizing plates At the time of composition, the reflection caused by the difference in refractive index is large at the interface such as the air layer or crystal, and there is a problem that the efficiency of using light decreases.

又，日本特開平10-133196號公報(專利文獻2)中，揭示一種液晶投影機用而直接積層有耐熱性經提升之偏光板之複合偏光板。然而，於厚度20至30μm之偏光膜的雙面配置有作為保護層之三乙醯纖維素膜之偏光板中，加熱時之偏光膜的收縮力大，有時會產生液晶面板彎曲、偏光板剝離等問題。又，使用熱傳導度成為0.8W/m‧K以上之玻璃等材料作為偏光膜之保護層時，會有裁切等加工不易且生產效率低之問題。由於如此情形，也有不易藉由在複合偏光板表面設置表面處理層來賦予功能性之問題。 In addition, Japanese Patent Laid-Open No. 10-133196 (Patent Document 2) discloses a composite polarizing plate for a liquid crystal projector in which a polarizing plate with improved heat resistance is directly laminated. However, in a polarizing plate in which a triacetyl cellulose film as a protective layer is disposed on both sides of a polarizing film having a thickness of 20 to 30 μm, the shrinking force of the polarizing film during heating is large, which may cause bending of the liquid crystal panel and polarizing plate Problems such as stripping. In addition, when using materials such as glass with a thermal conductivity of 0.8 W/m‧K or more as the protective layer of the polarizing film, there is a problem that the processing such as cutting is not easy and the production efficiency is low. Due to such circumstances, there is also a problem that it is not easy to impart functionality by providing a surface treatment layer on the surface of the composite polarizer.

[先前技術文獻] [Prior Technical Literature] [專利文獻] [Patent Literature]

[專利文獻1]日本特開2002-072162號公報 [Patent Document 1] Japanese Patent Application Publication No. 2002-072162

[專利文獻2]日本特開平10-133196號公報 [Patent Document 2] Japanese Patent Laid-Open No. 10-133196

本發明之目的係提供在高溫下的偏光度降低程度小、耐熱耐久性優異之複合偏光板。本發明之另一個目的係提供耐熱性高的液晶面板。 An object of the present invention is to provide a composite polarizing plate with a small degree of reduction in polarization degree at high temperature and excellent heat resistance durability. Another object of the present invention is to provide a liquid crystal panel with high heat resistance.

亦即，若依據本發明，提供一種複合偏光 板，其係依序積層第1保護膜、厚度15μm以下之第1偏光膜、厚度15μm以下之第2偏光膜而成，且第1偏光膜之吸收軸與第2偏光膜之吸收軸略呈平行。 That is, according to the present invention, a composite polarized light is provided The board is formed by sequentially stacking a first protective film, a first polarizing film with a thickness of 15 μm or less, and a second polarizing film with a thickness of 15 μm or less, and the absorption axis of the first polarizing film and the absorption axis of the second polarizing film are slightly parallel.

又，若依據本發明，亦提供一種複合偏光板，其係於第2偏光膜之與積層有第1偏光膜之面為相反側之面積層第2保護膜。 In addition, according to the present invention, there is also provided a composite polarizing plate which is a second protective film on the area layer of the second polarizing film opposite to the surface on which the first polarizing film is laminated.

該複合偏光板中，較佳係具有第1偏光膜及第1保護膜之第1偏光板的單體穿透率小於具有第2偏光膜及第2保護膜之第2偏光板的單體穿透率，較佳係第1偏光膜厚度與第2偏光膜之厚度差為5μm以下。又，亦提供一種複合偏光板，其係為了貼合於液晶面板，而在第2保護膜之與積層有第2偏光膜之面為相反側之面具備黏著劑層。 In this composite polarizing plate, it is preferable that the single polarizing plate having the first polarizing film and the first protective film has a single cell transmission rate smaller than that of the second polarizing plate having the second polarizing film and the second protective film. The transmittance is preferably such that the difference between the thickness of the first polarizing film and the thickness of the second polarizing film is 5 μm or less. In addition, there is also provided a composite polarizing plate, which is provided with an adhesive layer on the surface of the second protective film opposite to the side where the second polarizing film is deposited for bonding to the liquid crystal panel.

第2保護膜較佳係含有選自由纖維素系樹脂、聚烯烴系樹脂及丙烯酸系樹脂所成群組之至少一種，厚度方向之相位差值較佳係-10至10nm。 The second protective film preferably contains at least one selected from the group consisting of cellulose-based resins, polyolefin-based resins, and acrylic-based resins, and the phase difference in the thickness direction is preferably -10 to 10 nm.

又，若依據本發明，亦提供一種複合偏光板，其係在第1偏光膜與第2偏光膜之間具有第3保護膜。 Furthermore, according to the present invention, there is also provided a composite polarizing plate having a third protective film between the first polarizing film and the second polarizing film.

第3保護膜，較佳係包含纖維素系樹脂，並且在波長590nm之面內之相位差值Re(590)為10nm以下，在波長590nm之厚度方向之相位差值Rth(590)之絕對值為10nm以下。 The third protective film preferably contains a cellulose-based resin, and the retardation value Re(590) in the plane at a wavelength of 590 nm is 10 nm or less, and the absolute value of the retardation value Rth(590) in the thickness direction at a wavelength of 590 nm Below 10nm.

又，若依據本發明，亦提供一種液晶面板，其係以上述複合偏光板經由黏著劑而積層於液晶單元之至 少一側而成者。 Furthermore, according to the present invention, there is also provided a liquid crystal panel which is laminated to the liquid crystal cell by the above-mentioned composite polarizer through an adhesive The lesser side.

若依據本發明，藉由積層厚度15μm以下之2片偏光膜，可得到耐熱耐久性優異之複合偏光板及液晶面板。 According to the present invention, by laminating two polarizing films with a thickness of 15 μm or less, a composite polarizing plate and a liquid crystal panel excellent in heat resistance and durability can be obtained.

10‧‧‧複合偏光板 10‧‧‧Composite polarizer

11A‧‧‧第1偏光膜 11A‧‧‧The first polarizing film

11B‧‧‧第2偏光膜 11B‧‧‧The second polarizing film

12A‧‧‧第1保護膜 12A‧‧‧The first protective film

12B‧‧‧第2保護膜 12B‧‧‧Second protective film

13、14‧‧‧黏著劑層 13, 14‧‧‧ Adhesive layer

15‧‧‧第3保護膜 15‧‧‧The third protective film

20‧‧‧表面處理層 20‧‧‧Surface treatment layer

第1圖係表示本發明之複合偏光板之層構成之剖面示意圖之一例。 FIG. 1 is an example of a schematic cross-sectional view showing the layer structure of the composite polarizing plate of the present invention.

第2圖係表示本發明之複合偏光板之層構成之剖面示意圖之一例。 FIG. 2 is an example of a schematic cross-sectional view showing the layer structure of the composite polarizing plate of the present invention.

第3圖係表示本發明之複合偏光板之層構成之剖面示意圖之一例。 FIG. 3 is an example of a schematic cross-sectional view showing the layer structure of the composite polarizing plate of the present invention.

參照第1圖，說明本發明之複合偏光板10之層構成。本發明之複合偏光板10係依序積層第1保護膜12A、第1偏光膜11A、第2偏光膜11B而構成。於第2偏光膜11B之與積層有第1偏光膜11A之面為相反側之面，較佳係積層第2保護膜12B。於第1保護膜12A之與第1偏光膜11A之貼合面為相反側之面，形成表面處理層20亦為有用。 The layer structure of the composite polarizer 10 of the present invention will be described with reference to FIG. The composite polarizing plate 10 of the present invention is formed by sequentially stacking a first protective film 12A, a first polarizing film 11A, and a second polarizing film 11B. On the surface of the second polarizing film 11B that is opposite to the surface on which the first polarizing film 11A is laminated, the second protective film 12B is preferably laminated. It is also useful to form the surface treatment layer 20 on the surface of the first protective film 12A where the bonding surface of the first polarizing film 11A is on the opposite side.

又，參照第2圖，本發明之複合偏光板10係依序積層第1保護膜12A、第1偏光膜11A、第3保護膜15、第2偏光膜11B而構成。於第2偏光膜11B之與積 層有第3保護膜15之面為相反側之面，較佳係積層第2保護膜12B。於第1保護膜12A之與第1偏光膜11A之貼合面為相反側之面，形成表面處理層20亦為有用。 Further, referring to FIG. 2, the composite polarizing plate 10 of the present invention is formed by sequentially stacking a first protective film 12A, a first polarizing film 11A, a third protective film 15, and a second polarizing film 11B. The product of the second polarizing film 11B The surface with the third protective film 15 on the opposite side is preferably a layered second protective film 12B. It is also useful to form the surface treatment layer 20 on the surface of the first protective film 12A where the bonding surface of the first polarizing film 11A is on the opposite side.

本發明之複合偏光板中，第1偏光膜11A與第2偏光膜11B係以其吸收軸略呈平行之方式配置。本說明書中，略呈平行係指兩者所成之角並未嚴密限定為0°，而例如在0±5°之範圍內，較佳係在0±3°之範圍內。 In the composite polarizing plate of the present invention, the first polarizing film 11A and the second polarizing film 11B are arranged such that their absorption axes are slightly parallel. In this specification, slightly parallel means that the angle formed by the two is not strictly limited to 0°, but is, for example, within a range of 0±5°, preferably within a range of 0±3°.

以下，有時將含有第1保護膜12A與第1偏光膜11A之積層體稱為第1偏光板，將含有第2偏光膜11B與第2保護膜12B之積層體稱為第2偏光板。第3保護膜15包含在第1偏光板或第2偏光板之任一者中。亦即，較佳係本發明之複合偏光板10具有由第1偏光板與第2偏光板積層而成之層構成。 Hereinafter, the laminate including the first protective film 12A and the first polarizing film 11A may be referred to as a first polarizing plate, and the laminate including the second polarizing film 11B and the second protective film 12B may be referred to as a second polarizing plate. The third protective film 15 is included in either the first polarizing plate or the second polarizing plate. That is, it is preferable that the composite polarizing plate 10 of the present invention has a layer structure in which the first polarizing plate and the second polarizing plate are laminated.

為了抑制高溫環境下之偏光板之收縮力，將第1偏光膜、第2偏光膜之厚度皆設為15μm以下。又，藉由使第1偏光板之單體穿透率設為小於第2偏光板之單體穿透率，可使複合偏光板之單體穿透率更提高。 In order to suppress the shrinkage force of the polarizing plate in a high-temperature environment, the thicknesses of the first polarizing film and the second polarizing film are both set to 15 μm or less. In addition, by setting the monomer transmittance of the first polarizer to be smaller than that of the second polarizer, the monomer transmittance of the composite polarizer can be further improved.

再者，第1偏光膜之厚度與第2偏光膜之厚度之差較佳係5μm以下。第2保護膜較佳係含有選自由纖維素系樹脂、聚烯烴系樹脂及丙烯酸系樹脂所成群組之至少一種。又，第2保護膜之厚度方向之相位差值較佳係-10至10nm。 Furthermore, the difference between the thickness of the first polarizing film and the thickness of the second polarizing film is preferably 5 μm or less. The second protective film preferably contains at least one selected from the group consisting of cellulose resins, polyolefin resins, and acrylic resins. In addition, the phase difference in the thickness direction of the second protective film is preferably -10 to 10 nm.

複合偏光板10，可在第2偏光膜上或第2保護膜上積層黏著劑層14。可將複合偏光板經由黏著劑層 14而貼合於液晶單元，以得到液晶面板。通常，偏光板係貼合於液晶單元之雙面，但本發明之複合偏光板可適合使用於液晶顯示裝置之視認側及背面側或其兩者。 In the composite polarizing plate 10, an adhesive layer 14 may be laminated on the second polarizing film or the second protective film. The composite polarizer can be passed through the adhesive layer 14 Laminated to the liquid crystal cell to obtain a liquid crystal panel. Generally, the polarizing plate is attached to both sides of the liquid crystal cell, but the composite polarizing plate of the present invention can be suitably used for the viewing side and the back side of the liquid crystal display device or both.

第3保護膜15，較佳係使用包含纖維素系樹脂膜，且在波長590nm之面內之相位差值Re(590)為10nm以下，在波長590nm之厚度方向之相位差值Rth(590)之絕對值為10nm以下者。 As the third protective film 15, it is preferable to use a cellulose-based resin film, and the retardation value Re(590) in the plane at a wavelength of 590 nm is 10 nm or less, and the retardation value Rth(590) in the thickness direction at a wavelength of 590 nm The absolute value is less than 10nm.

本發明之複合偏光板，在被放置於高溫環境下之後，雖有各個偏光板之偏光度降低之虞，但因2片偏光板是以平行偏光(parallel nicol)之方式積層，故就複合偏光板而言可抑制偏光度降低。 After the composite polarizing plate of the present invention is placed in a high-temperature environment, although the polarization degree of each polarizing plate may be reduced, the two polarizing plates are laminated in parallel nicol, so the composite polarizing plate For the board, the decrease in polarization degree can be suppressed.

以下，一邊參照第1圖及第2圖所附之符號，一邊依序詳細說明構成本發明之複合偏光板、液晶面板之各自之構件。 Hereinafter, the members constituting the composite polarizing plate and the liquid crystal panel of the present invention will be described in detail in order while referring to the symbols attached to FIGS. 1 and 2.

[偏光膜] [Polarizing film]

構成複合偏光板10之第1偏光膜11A、第2偏光膜11B，通常可經過下述步驟而製造：將聚乙烯醇系樹脂膜一軸延伸之步驟；將聚乙烯醇系樹脂膜使用二色性色素進行染色而吸附二色性色素之步驟；將吸附有二色性色素之聚乙烯醇系樹脂膜使用硼酸水溶液進行處理而使其交聯之步驟；及在藉由硼酸水溶液而進行之交聯處理後進行水洗之步驟。 The first polarizing film 11A and the second polarizing film 11B constituting the composite polarizing plate 10 can usually be manufactured through the following steps: a step of uniaxially extending the polyvinyl alcohol-based resin film; dichroism is used for the polyvinyl alcohol-based resin film The step of dyeing the pigment to adsorb the dichroic pigment; the step of treating the polyvinyl alcohol resin film adsorbed with the dichroic pigment with a boric acid aqueous solution to make it crosslink; and the crosslinking by the boric acid aqueous solution Steps of water washing after treatment.

聚乙烯醇系樹脂可藉由將聚乙酸乙烯酯系 樹脂皂化而製造。聚乙酸乙烯酯系樹脂，除了可為屬於乙酸乙烯酯的均聚物之聚乙酸乙烯酯之外，亦可為乙酸乙烯酯和可與乙酸乙烯酯共聚合之其他單體之共聚物。就可與乙酸乙烯酯共聚合之其他單體而言，可列舉例如：不飽和羧酸類、烯烴類、乙烯醚類、不飽和磺酸類、具有銨基之丙烯醯胺類等。 Polyvinyl alcohol-based resin can be Manufactured by saponification of resin. The polyvinyl acetate-based resin may be a copolymer of vinyl acetate and other monomers copolymerizable with vinyl acetate, in addition to polyvinyl acetate which is a homopolymer of vinyl acetate. Examples of other monomers copolymerizable with vinyl acetate include unsaturated carboxylic acids, olefins, vinyl ethers, unsaturated sulfonic acids, and propylene amides having an ammonium group.

聚乙烯醇系樹脂之皂化度，通常係85至100莫耳%左右，較佳係98莫耳%以上。聚乙烯醇系樹脂亦可經過改質，例如可使用經醛類改質之聚乙烯縮甲醛(polyvinyl formal)、聚乙烯縮乙醛(polyvinyl acetal)等。聚乙烯醇系樹脂之聚合度，通常係1,000至10,000左右，較佳係1,500至5,000左右。 The saponification degree of the polyvinyl alcohol-based resin is usually about 85 to 100 mol%, preferably 98 mol% or more. The polyvinyl alcohol-based resin may also be modified. For example, polyvinyl formal modified with polyvinyl aldehyde and polyvinyl acetal may be used. The degree of polymerization of the polyvinyl alcohol-based resin is usually about 1,000 to 10,000, preferably about 1,500 to 5,000.

將此種聚乙烯醇系樹脂製膜而成者，可作為偏光膜之原捲膜而使用。將聚乙烯醇系樹脂製膜之方法無特別限定，可用公知方法製膜。聚乙烯醇系樹脂原捲膜之膜厚係例如10至100μm左右，較佳係10至50μm左右。 A film made of such a polyvinyl alcohol-based resin can be used as the original roll of polarizing film. The method of forming the polyvinyl alcohol resin film is not particularly limited, and the film can be formed by a known method. The film thickness of the original roll of polyvinyl alcohol-based resin is, for example, about 10 to 100 μm, preferably about 10 to 50 μm.

聚乙烯醇系樹脂膜之一軸延伸可在藉由二色性色素而進行之染色前、在染色的同時、或在染色後進行。當將一軸延伸在染色後進行時，該一軸延伸可在硼酸處理前進行，亦可在硼酸處理中進行。當然，亦可在此處所示之複數個階段進行一軸延伸。一軸延伸，可採用在周速相異之輥間進行一軸延伸之方法、或使用熱輥進行一軸延伸之方法等。又，一軸延伸，可藉由在大氣中進行延伸 之乾式延伸來進行，亦可藉由使用水等溶劑使聚乙烯醇系樹脂膜在膨潤之狀態進行延伸之濕式延伸來進行。延伸倍率通常係3至8倍左右。 The one-axis extension of the polyvinyl alcohol-based resin film may be performed before dyeing by the dichroic dye, simultaneously with dyeing, or after dyeing. When the uniaxial stretching is performed after dyeing, the uniaxial stretching may be performed before boric acid treatment, or may be performed in boric acid treatment. Of course, it is also possible to perform uniaxial extension in the plural stages shown here. For uniaxial extension, a method of uniaxial extension between rollers with different peripheral speeds, or a method of uniaxial extension using hot rollers, etc. may be used. Also, one axis can be extended by extending in the atmosphere The dry stretching can also be performed by wet stretching using a solvent such as water to stretch the polyvinyl alcohol-based resin film in a swollen state. The stretch magnification is usually about 3 to 8 times.

聚乙烯醇系樹脂膜之藉由二色性色素而進行之染色，例如可藉由將聚乙烯醇系樹脂膜浸漬於含有二色性色素之水溶液中之方法來進行。就二色性色素而言，具體上可用碘、二色性有機染料。再者，聚乙烯醇系樹脂膜，較佳係在染色處理之前，事先施以浸漬於水而膨潤之處理。 The dyeing of the polyvinyl alcohol-based resin film by the dichroic dye can be performed, for example, by immersing the polyvinyl alcohol-based resin film in the aqueous solution containing the dichroic dye. As for dichroic pigments, iodine and dichroic organic dyes can be specifically used. In addition, it is preferable that the polyvinyl alcohol-based resin film is swollen by immersion in water before dyeing.

使用碘作為二色性色素時，通常採用將聚乙烯醇系樹脂膜浸漬於含有碘及碘化鉀之水溶液而染色之方法。相對於水100重量份，該水溶液中之碘之含量通常係0.01至1重量份左右，相對於水100重量份，碘化鉀之含量通常係0.5至20重量份左右。染色所用之水溶液之溫度通常係20至40℃左右。又，於該水溶液之浸漬時間(染色時間)通常係20至1,800秒左右。 When iodine is used as a dichroic dye, a method of immersing a polyvinyl alcohol-based resin film in an aqueous solution containing iodine and potassium iodide and dyeing is generally used. The content of iodine in the aqueous solution is usually about 0.01 to 1 part by weight relative to 100 parts by weight of water, and the content of potassium iodide is usually about 0.5 to 20 parts by weight relative to 100 parts by weight of water. The temperature of the aqueous solution used for dyeing is usually about 20 to 40°C. In addition, the immersion time (dyeing time) in the aqueous solution is usually about 20 to 1,800 seconds.

另一方面，使用二色性有機染料作為二色性色素時，通常採用將聚乙烯醇系樹脂膜浸漬於含有水溶性二色性有機染料之水溶液而染色之方法。相對於水100重量份，該水溶液中之二色性有機染料之含量通常係1×10^-4至10重量份左右，較佳係1×10^-3至1重量份。該染料水溶液可含有如硫酸鈉等無機鹽作為染色助劑。染色所用之二色性有機染料水溶液之溫度，通常係20至80℃左右。又，於該水溶液之浸漬時間(染色時間)通常係10至1,800 秒左右。 On the other hand, when a dichroic organic dye is used as a dichroic dye, a method of immersing a polyvinyl alcohol-based resin film in an aqueous solution containing a water-soluble dichroic organic dye and dyeing is generally used. The content of the dichroic organic dye in the aqueous solution is usually about 1×10 ⁻⁴ to 10 parts by weight, preferably 1×10 ⁻³ to 1 part by weight, relative to 100 parts by weight of water. The aqueous dye solution may contain inorganic salts such as sodium sulfate as a dyeing aid. The temperature of the aqueous solution of the dichroic organic dye used for dyeing is usually about 20 to 80°C. In addition, the immersion time (dyeing time) in the aqueous solution is usually about 10 to 1,800 seconds.

在藉由二色性色素而進行之染色後之硼酸處理，可藉由將經染色之聚乙烯醇系樹脂膜浸漬於含有硼酸之水溶液之方法來進行。相對於水100重量份，含有硼酸之水溶液中之硼酸之含量通常係2至15重量份左右，較佳係5至12重量份。使用碘作為二色性色素時，該含有硼酸之水溶液較佳係含有碘化鉀。相對於水100重量份，含有硼酸之水溶液中之碘化鉀之含量通常係0.1至15重量份左右，較佳係5至12重量份。於含有硼酸之水溶液之浸漬時間通常係60至1,200秒左右，較佳係150至600秒，更佳係200至400秒。含有硼酸之水溶液之溫度通常係50℃以上，較佳係50至85℃，更佳係60至80℃。 The boric acid treatment after the dyeing with the dichroic pigment can be performed by immersing the dyed polyvinyl alcohol-based resin film in an aqueous solution containing boric acid. The content of boric acid in the aqueous solution containing boric acid is usually about 2 to 15 parts by weight, preferably 5 to 12 parts by weight relative to 100 parts by weight of water. When iodine is used as the dichroic dye, the aqueous solution containing boric acid preferably contains potassium iodide. The content of potassium iodide in the aqueous solution containing boric acid is usually about 0.1 to 15 parts by weight, preferably 5 to 12 parts by weight relative to 100 parts by weight of water. The immersion time in the aqueous solution containing boric acid is usually about 60 to 1,200 seconds, preferably 150 to 600 seconds, and more preferably 200 to 400 seconds. The temperature of the aqueous solution containing boric acid is usually above 50°C, preferably 50 to 85°C, more preferably 60 to 80°C.

硼酸處理後之聚乙烯醇系樹脂膜，通常進行水洗處理。水洗處理，可藉由例如將經硼酸處理之聚乙烯醇系樹脂膜浸漬於水之方法來進行。水洗可使用含有碘化鉀之溶液。水洗處理中之水之溫度通常係5至40℃左右。又，浸漬時間通常係1至120秒左右。 The polyvinyl alcohol resin film after boric acid treatment is usually washed with water. The water washing treatment can be performed by, for example, immersing the boric acid-treated polyvinyl alcohol-based resin film in water. For washing, a solution containing potassium iodide can be used. The temperature of the water in the washing process is usually about 5 to 40°C. In addition, the immersion time is usually about 1 to 120 seconds.

水洗後施以乾燥處理，得到偏光膜。乾燥處理可使用熱風乾燥機、遠紅外線加熱器來進行。乾燥處理之溫度通常係30至100℃左右，較佳係50至80℃。乾燥處理之時間通常係60至600秒左右，較佳係120至600秒。藉由乾燥處理，使偏光膜中之水分率減少到實用程度。該水分率通常係5至20重量%左右，較佳係8至15重量%。水分率低於5重量%時，會有失去偏光膜之可撓性、乾燥 後損傷或破裂之情形。又，水分率超過20重量%時，會有熱安定性不足之傾向。 After washing with water, a drying treatment is applied to obtain a polarizing film. The drying process can be performed using a hot air dryer or a far-infrared heater. The drying temperature is usually about 30 to 100°C, preferably 50 to 80°C. The drying time is usually about 60 to 600 seconds, preferably 120 to 600 seconds. By drying, the moisture content in the polarizing film is reduced to a practical level. The moisture content is usually about 5 to 20% by weight, preferably 8 to 15% by weight. When the moisture content is less than 5% by weight, it will lose the flexibility and dryness of the polarizing film After damage or rupture. In addition, when the moisture content exceeds 20% by weight, the thermal stability tends to be insufficient.

依照以上方式，可製造使二色性色素吸附配向於聚乙烯醇系樹脂膜而成之偏光膜。 According to the above method, a polarizing film obtained by aligning a dichroic dye with a polyvinyl alcohol-based resin film can be manufactured.

又，偏光膜之製造步驟中之聚乙烯醇系樹脂膜之延伸、染色、硼酸處理、水洗步驟、乾燥步驟，可依據例如日本特開2012-159778號所記載之方法來進行。該文獻記載之方法中，使用藉由對基材膜塗佈聚乙烯醇系樹脂而形成會成為偏光膜之聚乙烯醇系樹脂層之方法係亦為有用。 In addition, the stretching, dyeing, boric acid treatment, water washing step, and drying step of the polyvinyl alcohol resin film in the manufacturing process of the polarizing film can be performed according to the method described in Japanese Patent Application Laid-Open No. 2012-159778, for example. In the method described in this document, it is also useful to use a method of forming a polyvinyl alcohol-based resin layer that will become a polarizing film by applying a polyvinyl alcohol-based resin to a base film.

從抑制高溫環境下之偏光度降低之觀點來看、且從可保持良好外觀之觀點來看，較佳係使偏光膜本身之收縮力低。若欲使高溫環境下之偏光膜之收縮力抑制為低值，較佳係使偏光膜厚度為12μm以下。從可賦予良好的光學特性之觀點來看，偏光膜之厚度通常係3μm以上。 From the viewpoint of suppressing the decrease in the degree of polarization in a high-temperature environment, and from the viewpoint of maintaining a good appearance, it is preferable to make the shrinkage force of the polarizing film itself low. If the shrinkage force of the polarizing film in a high-temperature environment is to be suppressed to a low value, it is preferable that the thickness of the polarizing film is 12 μm or less. From the viewpoint of imparting good optical characteristics, the thickness of the polarizing film is usually 3 μm or more.

第1偏光膜11A之厚度與第2偏光膜11B之厚度之差的程度較佳係5μm以下。更佳係3μm以下。如此使用厚度差小之偏光膜，藉此可將高溫環境下之尺寸變化以第1偏光膜11A與第2偏光膜11B而配合。因此，認為起因於由2片偏光膜之熱收縮差所導致之應力差而發生之偏光膜裂縫係受到抑制。 The degree of difference between the thickness of the first polarizing film 11A and the thickness of the second polarizing film 11B is preferably 5 μm or less. More preferably, it is 3 μm or less. In this way, a polarizing film with a small thickness difference is used, whereby the first polarizing film 11A and the second polarizing film 11B can be matched with the dimensional change in a high-temperature environment. Therefore, it is considered that the cracking of the polarizing film caused by the difference in stress caused by the difference in thermal shrinkage of the two polarizing films is suppressed.

偏光膜於80℃之溫度保持240分鐘時，較佳係其吸收軸方向之寬度每2mm之收縮力為2N以下。該 收縮力大於2N時，高溫環境下之尺寸變化量變大且偏光膜之收縮力變大，故偏光膜有變得容易發生破裂或剝離之傾向。當使延伸倍率下降、或使偏光膜之厚度薄時，偏光膜之收縮力有變成2N以下之傾向。 When the polarizing film is maintained at a temperature of 80°C for 240 minutes, it is preferable that the shrinkage force per 2 mm of the width in the absorption axis direction is 2 N or less. The When the shrinkage force is greater than 2N, the amount of dimensional change in a high-temperature environment becomes larger and the shrinkage force of the polarizing film becomes larger, so the polarizing film tends to easily break or peel. When the stretching magnification is decreased or the thickness of the polarizing film is made thin, the shrinking force of the polarizing film tends to become 2N or less.

又，2片偏光膜之吸收軸方向之寬度每2mm之收縮力之差較佳係1N以下，更佳係0.5N以下。如同後述，本發明之複合偏光板中，較佳係第2偏光板之單體穿透率大於第1偏光板之單體穿透率，故2片偏光膜之收縮力之大小亦可相異，例如收縮力之差可為0.1N以上。 In addition, the difference in shrinkage force per 2 mm of the width of the two polarizing films in the absorption axis direction is preferably 1 N or less, more preferably 0.5 N or less. As described later, in the composite polarizer of the present invention, it is preferred that the second polarizer has a monomer transmission rate greater than that of the first polarizer, so the shrinkage forces of the two polarizing films may also be different For example, the difference in contraction force may be 0.1 N or more.

[第1保護膜12A] [1st protective film 12A]

複合偏光板10所用之第1保護膜12A可由透明樹脂膜構成。尤其，較佳係由透明性、機械的強度、熱安定性、水分遮蔽性等優異之材料構成。本說明書中，透明樹脂膜係指可見光區域中之單體穿透率為80%以上之樹脂膜。 The first protective film 12A used in the composite polarizing plate 10 may be composed of a transparent resin film. In particular, it is preferably composed of a material excellent in transparency, mechanical strength, thermal stability, moisture shielding properties, and the like. In this specification, the transparent resin film refers to a resin film having a monomer transmittance of 80% or more in the visible light region.

就第1保護膜12A而言，可使用由纖維素系樹脂、鏈狀聚烯烴系樹脂、環狀聚烯烴系樹脂、丙烯酸系樹脂、聚醯亞胺系樹脂、聚碳酸酯系樹脂、聚酯系樹脂等在該領域廣泛使用來作為以往保護膜之形成材料之材料所形成之膜。就構成保護膜12A之材料而言，例如較佳係纖維素系樹脂。 For the first protective film 12A, cellulose resin, chain polyolefin resin, cyclic polyolefin resin, acrylic resin, polyimide resin, polycarbonate resin, polyester can be used Films made of materials such as resins are widely used in the field as materials for forming conventional protective films. The material constituting the protective film 12A is preferably a cellulose resin, for example.

纖維素系樹脂，可為纖維素之羥基中之氫原子之一部分或全部經乙醯基、丙醯基及/或丁醯基取代之纖維素的有機酸酯或混合有機酸酯。可列舉例如：由纖維 素的乙酸酯、丙酸酯、丁酸酯、該等之混合酯等而成者。其中，較佳係三乙醯纖維素、二乙醯纖維素、纖維素乙酸酯丙酸酯、纖維素乙酸酯丁酸酯等。 The cellulose-based resin may be an organic acid ester or a mixed organic acid ester of cellulose in which a part or all of the hydrogen atoms in the hydroxyl groups of cellulose are substituted with acetyl, propyl and/or butyl acetyl groups. Examples include: fiber It is made of acetate, propionate, butyrate, mixed ester of these, etc. Among them, triacetyl cellulose, diethyl cellulose, cellulose acetate propionate, cellulose acetate butyrate and the like are preferred.

該等樹脂，在無損透明性之範圍內可調配適宜的添加物。就添加物而言，可列舉例如：抗氧化劑、紫外線吸收劑、抗靜電劑、滑劑、成核劑、防霧劑、抗結塊劑(antiblocking agent)、相位差降低劑、安定劑、加工助劑、塑化劑、耐衝擊助劑、消光劑、抗菌劑、防霉劑等。該等添加物亦可併用複數種。 These resins can be formulated with suitable additives within the range of no loss of transparency. Examples of additives include antioxidants, ultraviolet absorbers, antistatic agents, slip agents, nucleating agents, anti-fogging agents, antiblocking agents, retardation reducing agents, stabilizers, and processing agents Additives, plasticizers, impact-resistant additives, matting agents, antibacterial agents, mildew inhibitors, etc. These additives can also be used in combination.

就從上述樹脂製膜成薄膜之方法而言，適當地選擇任意之最適宜之方法即可。可使用例如下述方法：將經溶解於溶劑中之樹脂流延至金屬製帶(band)或滾筒(drum)，將溶劑乾燥去除而得到膜之溶劑鑄造法；將樹脂加熱至其熔融溫度以上，混練並從模具擠出，冷卻而得到膜之熔融擠製法等。熔融擠製法中，可擠製單層膜，亦可同時擠製多層膜。 As for the method of forming a film from the above resin, any suitable method may be appropriately selected. For example, the following method may be used: a solvent casting method in which a resin dissolved in a solvent is cast to a metal band or drum, and the solvent is dried and removed to obtain a film; and the resin is heated above its melting temperature, Kneading and extruding from the die, cooling to obtain the film melt extrusion method, etc. In the melt extrusion method, a single-layer film can be extruded, or a multi-layer film can also be extruded at the same time.

該等樹脂之膜可容易取得市售品。若列舉市售之膜之例，就纖維素系樹脂膜而言，分別以商品名表示，有：FUJIFILM股份有限公司所販售之“FUJITAC(註冊商標)TD”、KONICA MINOLTA股份有限公司所販售之“KONICA MINOLTA TAC FILM KC”等。 Films of these resins can be easily obtained from commercially available products. To cite examples of commercially available films, cellulose-based resin films are indicated by their trade names, respectively: "FUJITAC (registered trademark) TD" sold by FUJIFILM Co., Ltd. and KONICA MINOLTA Co., Ltd. "KONICA MINOLTA TAC FILM KC", etc.

[第1保護膜12A之表面處理層20] [Surface treatment layer 20 of the first protective film 12A]

第1保護膜12A，可在與貼合第1偏光膜11A之面為 相反側之面具有表面處理層20。就該表面處理層20而言，可列舉例如具有細微的表面凹凸形狀之硬塗層。硬塗層較佳係鉛筆硬度比H硬。該鉛筆硬度為H或比H小時，表面容易受傷，負傷時液晶顯示裝置之視認性變差。鉛筆硬度係依據JIS K 5600-5-4：1999「塗料一般試驗方法-第5部：塗膜之機械性質-第4節：刮痕硬度(鉛筆法)」來求取，以使用各硬度之鉛筆刮劃時未產生傷之最硬的鉛筆硬度來表示。 The first protective film 12A can be formed on the surface to which the first polarizing film 11A is bonded The surface on the opposite side has the surface treatment layer 20. The surface treatment layer 20 may include, for example, a hard coat layer having a fine surface uneven shape. The hard coat layer preferably has a pencil hardness harder than H. When the pencil hardness is H or less than H, the surface is easy to be injured, and the visibility of the liquid crystal display device becomes worse when injured. The pencil hardness is obtained in accordance with JIS K 5600-5-4: 1999 "General Test Methods for Paints-Part 5: Mechanical Properties of Coating Films-Section 4: Scratch Hardness (Pencil Method)" to use the hardness It is indicated by the hardness of the hardest pencil that does not cause any damage when the pencil is scratched.

具有表面處理層20之第1保護膜12A，較佳係以使其霧度值成為0.1至45%之範圍，更佳係成為5至40%之範圍。霧度值在比45%大之區域時，雖可減少外光之倒映，但黑顯示畫面之緻密度會降低。又，霧度值低於0.1%時，無法得到充分的防眩性能，外光會倒映在畫面而為不佳。在此，霧度值係依據JIS K 7136：2000「塑膠-透明材料之霧度之求取方法」來求取。 The first protective film 12A having the surface treatment layer 20 preferably has a haze value in the range of 0.1 to 45%, and more preferably in the range of 5 to 40%. When the haze value is greater than 45%, although the reflection of external light can be reduced, the density of the black display screen will be reduced. Also, when the haze value is less than 0.1%, sufficient anti-glare performance cannot be obtained, and the external light is reflected on the screen, which is not good. Here, the haze value is obtained in accordance with JIS K 7136: 2000 "Method for determining the haze of plastic-transparent materials".

具有細微的表面凹凸形狀之硬塗層，可藉由下述方法來形成：在樹脂膜表面形成含有有機微粒子或無機微粒子之塗膜之方法；在形成含有或不含有機微粒子或無機微粒子之塗膜後，用經賦予凹凸形狀之輥按壓之方法，例如壓印(emboss)法等。此種塗膜，可藉由例如在樹脂膜表面塗佈含有由硬化性樹脂而成之黏結劑(binder)成分與有機微粒子或無機微粒子之塗佈液(硬化性樹脂組成物)之方法等來形成。 The hard coat layer with fine surface unevenness can be formed by the following method: a method of forming a coating film containing organic fine particles or inorganic fine particles on the surface of the resin film; and forming a coating containing or not containing organic fine particles or inorganic fine particles After the film is applied, a method of pressing with a roller having an uneven shape, such as an emboss method. Such a coating film can be obtained, for example, by applying a coating solution (curable resin composition) containing a binder component made of a curable resin and organic fine particles or inorganic fine particles on the surface of the resin film, etc. form.

就無機微粒子而言，可使用例如氧化矽、 膠質氧化矽、氧化鋁、氧化鋁溶膠、鋁矽酸鹽、氧化鋁-氧化矽複合氧化物、高嶺土、滑石、雲母、碳酸鈣、磷酸鈣等。又，就有機微粒子而言，可使用交聯聚丙烯酸粒子、甲基丙烯酸甲酯/苯乙烯共聚物樹脂粒子、交聯聚苯乙烯粒子、交聯聚甲基丙烯酸甲酯粒子、聚矽氧(silicone)樹脂粒子、或聚醯亞胺粒子等樹脂粒子。 For inorganic fine particles, for example, silica, Colloidal silica, alumina, alumina sol, aluminosilicate, alumina-silica composite oxide, kaolin, talc, mica, calcium carbonate, calcium phosphate, etc. As for the organic fine particles, cross-linked polyacrylic acid particles, methyl methacrylate/styrene copolymer resin particles, cross-linked polystyrene particles, cross-linked polymethyl methacrylate particles, polysilicone ( (silicone) resin particles, or resin particles such as polyimide particles.

用以使無機微粒子或有機微粒子分散之黏結劑成分，只要從會成為高硬度(硬塗)之材料來選擇決定即可。就黏結劑成分而言，可使用光硬化性樹脂、熱硬化性樹脂、電子束硬化性樹脂等，但從生產性、所得之表面處理層20之硬度等之觀點來看，較佳係光硬化性樹脂。就光硬化性樹脂而言，可適當地使用市售者。例如可將三羥甲基丙烷三丙烯酸酯、新戊四醇四丙烯酸酯等多官能丙烯酸酯單獨或組合2種以上使用，於其中混合“IRGACURE(註冊商標)907”、“IRGACURE(註冊商標)184”或“Lucirin(註冊商標)TPO”(皆為BASF公司所販售之商品名)等光聚合起始劑，做成光硬化性樹脂。使用光硬化性樹脂時，於其中分散無機微粒子或有機微粒子而得到樹脂組成物，將所得之樹脂組成物塗佈於樹脂膜上，藉由照射光，可形成在黏結劑樹脂中分散有無機微粒子或有機微粒子之硬塗層。 The binder component used to disperse the inorganic fine particles or the organic fine particles can be selected and determined from materials that will become high hardness (hard coating). As the binder component, photo-curable resin, thermosetting resin, electron beam curable resin, etc. can be used, but from the viewpoint of productivity, hardness of the surface treatment layer 20 obtained, etc., it is preferably photo-curable Sexual resin. For photocurable resins, commercially available ones can be used as appropriate. For example, multifunctional acrylates such as trimethylolpropane triacrylate and neopentyl alcohol tetraacrylate can be used alone or in combination of two or more, and "IRGACURE (registered trademark) 907" and "IRGACURE (registered trademark)" can be mixed therein. 184" or "Lucirin (registered trademark) TPO" (both are trade names sold by BASF) and other photopolymerization initiators, which are made into photocurable resins. When a photocurable resin is used, inorganic fine particles or organic fine particles are dispersed therein to obtain a resin composition, and the resulting resin composition is coated on a resin film, and by irradiating light, inorganic fine particles can be formed dispersed in the binder resin Or a hard coating of organic particles.

就構成光硬化性樹脂之多官能丙烯酸酯而言，除了上述之三羥甲基丙烷三丙烯酸酯、新戊四醇四丙烯酸酯等單體型者之外，還可使用胺甲酸酯丙烯酸酯、多 元醇(甲基)丙烯酸酯、或具有含2個以上羥基之烷基之(甲基)丙烯酸系寡聚物等寡聚物型者。 For the multifunctional acrylate constituting the photocurable resin, in addition to the monomer types such as trimethylolpropane triacrylate and neopentyl tetraacrylate, the urethane acrylate can also be used ,many An oligomer type such as a monohydric alcohol (meth)acrylate or a (meth)acrylic oligomer having an alkyl group containing two or more hydroxyl groups.

在此所謂的胺甲酸酯丙烯酸酯，係例如使用(甲基)丙烯酸及/或(甲基)丙烯酸酯、多元醇、以及二異氰酸酯而調製。具體而言，可藉由從(甲基)丙烯酸及/或(甲基)丙烯酸酯與多元醇調製殘留至少1個羥基之羥基(甲基)丙烯酸酯，並使其與二異氰酸酯反應之方法來製造胺甲酸酯丙烯酸酯。該等(甲基)丙烯酸及/或(甲基)丙烯酸酯、多元醇、以及二異氰酸酯可分別使用1種，亦可將2種以上組合使用。又，可依目的而添加各種添加劑。 The urethane acrylate here is prepared, for example, using (meth)acrylic acid and/or (meth)acrylate, polyol, and diisocyanate. Specifically, it can be prepared by preparing (meth)acrylic acid and/or (meth)acrylic acid ester and polyhydric alcohol, a hydroxy (meth)acrylic acid ester with at least one hydroxyl group remaining, and reacting it with diisocyanate Manufacture of urethane acrylate. These (meth)acrylic acid and/or (meth)acrylates, polyols, and diisocyanates may be used alone or in combination of two or more. In addition, various additives can be added depending on the purpose.

就在製造胺甲酸酯丙烯酸酯時所用之(甲基)丙烯酸酯而言，可列舉例如：(甲基)丙烯酸甲酯、(甲基)丙烯酸乙酯、(甲基)丙烯酸丙酯、(甲基)丙烯酸異丙酯、及(甲基)丙烯酸丁酯等(甲基)丙烯酸烷酯；(甲基)丙烯酸環己酯等(甲基)丙烯酸環烷酯。 Examples of the (meth)acrylate used in the manufacture of urethane acrylate include methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, ( Alkyl (meth)acrylates such as isopropyl meth)acrylate and butyl (meth)acrylate; cycloalkyl (meth)acrylates such as cyclohexyl (meth)acrylate.

同樣於製造胺甲酸酯丙烯酸酯時所用之多元醇，係分子內具有至少2個羥基之化合物。若列舉具體例，則有：乙二醇、三亞甲基二醇、丙二醇、二乙二醇、二丙二醇、新戊二醇、1,3-丁烷二醇、1,4-丁烷二醇、1,6-己烷二醇、1,9-壬烷二醇、1,10-癸烷二醇、2,2,4-三甲基-1,3-戊烷二醇、3-甲基-1,5-戊烷二醇、羥基三甲基乙酸的新戊二醇酯、環己烷二羥甲基、1,4-環己烷二醇、螺二醇(spiroglycol)、三環癸烷二羥甲基、氫化雙酚A、環氧乙烷加成雙酚A、環氧丙烷加成雙酚A、三羥甲基乙烷、三-二 羥甲基丙烷、甘油、3-甲基戊烷-1,3,5-三醇、新戊四醇、二新戊四醇、三新戊四醇、葡萄糖類等。 The polyol used in the manufacture of urethane acrylate is also a compound having at least two hydroxyl groups in the molecule. Specific examples are: ethylene glycol, trimethylene glycol, propylene glycol, diethylene glycol, dipropylene glycol, neopentyl glycol, 1,3-butanediol, 1,4-butanediol , 1,6-hexanediol, 1,9-nonanediol, 1,10-decanediol, 2,2,4-trimethyl-1,3-pentanediol, 3-methyl 1,5-pentanediol, neopentyl glycol hydroxytrimethylacetate, cyclohexane dimethylol, 1,4-cyclohexanediol, spiroglycol, tricyclic Decane dimethylol, hydrogenated bisphenol A, ethylene oxide addition bisphenol A, propylene oxide addition bisphenol A, trimethylol ethane, tri-di Hydroxymethylpropane, glycerin, 3-methylpentane-1,3,5-triol, neopentaerythritol, dipentaerythritol, tripentaerythritol, glucose, etc.

同樣於製造胺甲酸酯丙烯酸酯時所用之二異氰酸酯，可為芳香族、脂肪族或脂環式之各種二異氰酸酯類。若列舉具體例，則有：四亞甲基二異氰酸酯、六亞甲基二異氰酸酯、異佛酮二異氰酸酯、2,4-甲苯二異氰酸酯、1,5-萘二異氰酸酯、二苯基-4,4’-二異氰酸酯、3,3’-二甲基二苯基-4,4’-二異氰酸酯、苯二甲基二異氰酸酯、三甲基六亞甲基二異氰酸酯、二苯基甲烷-4,4’-二異氰酸酯、及該等中具有芳香環之化合物之氫化物等。 Similarly, the diisocyanates used in the manufacture of urethane acrylates can be aromatic, aliphatic or alicyclic diisocyanates. Specific examples include: tetramethylene diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, 2,4-toluene diisocyanate, 1,5-naphthalene diisocyanate, diphenyl-4, 4'-diisocyanate, 3,3'-dimethyldiphenyl-4,4'-diisocyanate, xylylene diisocyanate, trimethylhexamethylene diisocyanate, diphenylmethane-4, 4'-diisocyanate, and hydrides of compounds with aromatic rings among them.

若列舉可成為多官能丙烯酸酯之多元醇(甲基)丙烯酸酯之具體例，則有：新戊四醇二(甲基)丙烯酸酯、新戊四醇三(甲基)丙烯酸酯、新戊四醇四(甲基)丙烯酸酯、二新戊四醇六(甲基)丙烯酸酯、1,6-己烷二醇二(甲基)丙烯酸酯等。該等可分別單獨使用，亦可組合使用。再者，可視需要而添加各種添加劑。多元醇(甲基)丙烯酸酯較佳係含有新戊四醇三丙烯酸酯及新戊四醇四丙烯酸酯。該等可為共聚物，亦可為混合物。 Specific examples of polyhydric alcohol (meth)acrylates that can become polyfunctional acrylates include: neopentaerythritol di(meth)acrylate, neopentaerythritol tri(meth)acrylate, neopentyl Tetraol tetra(meth)acrylate, dipentaerythritol hexa(meth)acrylate, 1,6-hexanediol di(meth)acrylate, etc. These can be used individually or in combination. Furthermore, various additives may be added as needed. The polyol (meth)acrylate preferably contains neopentyl tetraacrylate and neopentyl tetraacrylate. These can be copolymers or mixtures.

再者，就別的可成為多官能丙烯酸酯之具有含有2個以上之羥基之烷基之(甲基)丙烯酸系寡聚物而言，可列舉例如：具有2,3-二羥基丙基之(甲基)丙烯酸系寡聚物、或具有2-羥基乙基及2,3-二羥基丙基之(甲基)丙烯酸系寡聚物。 In addition, other (meth)acrylic oligomers having an alkyl group containing two or more hydroxyl groups that can become polyfunctional acrylates include, for example, those having 2,3-dihydroxypropyl groups. (Meth)acrylic oligomer, or (meth)acrylic oligomer having 2-hydroxyethyl and 2,3-dihydroxypropyl.

若列舉構成光硬化性樹脂之光聚合起始劑 之具體例，則有：2,2-二甲氧基-2-苯基苯乙酮、苯乙酮、二苯甲酮、氧雜蒽酮(xanthone)、3-甲基苯乙酮、4-氯二苯甲酮、4,4’-二甲氧基二苯甲酮、苯偶姻丙基醚、安息香雙甲醚(benzil dimethyl ketal)、N,N,N’,N’-四甲基-4,4’-二胺基二苯甲酮、1-(4-異丙基苯基)-2-羥基-2-甲基丙烷-1-酮、其他硫雜蒽酮(thioxanthone)系化合物等。 If the photopolymerization initiator constituting the photocurable resin is listed Specific examples are: 2,2-dimethoxy-2-phenylacetophenone, acetophenone, benzophenone, xanthone, 3-methylacetophenone, 4 -Chlorobenzophenone, 4,4'-dimethoxybenzophenone, benzoin propyl ether, benzil dimethyl ketal, N,N,N',N'-tetramethyl -4,4'-diaminobenzophenone, 1-(4-isopropylphenyl)-2-hydroxy-2-methylpropane-1-one, other thioxanthone series Compounds etc.

光硬化性樹脂可視需要而在溶解於溶媒之狀態使用。就溶媒而言，可使用以乙酸乙酯、乙酸丁酯為首之各種有機溶媒。 The photo-curable resin can be used in a state of being dissolved in a solvent if necessary. As for the solvent, various organic solvents including ethyl acetate and butyl acetate can be used.

又，光硬化性樹脂可含有調平劑，可列舉例如氟系或聚矽氧系之調平劑。就聚矽氧系調平劑而言，可列舉反應性聚矽氧、聚二甲基矽氧烷、聚醚改質聚二甲基矽氧烷、聚甲基烷基矽氧烷。較佳係反應性聚矽氧及矽氧烷系調平劑。藉由使用反應性聚矽氧之調平劑，而可對硬塗層表面賦予滑動性，可長期間維持優異之耐擦傷性。另一方面，使用矽氧烷系之調平劑時，可提升膜形成能力。 In addition, the photocurable resin may contain a leveling agent, and for example, a fluorine-based or polysiloxane-based leveling agent may be mentioned. Examples of the polysiloxane-based leveling agent include reactive polysiloxane, polydimethylsiloxane, polyether-modified polydimethylsiloxane, and polymethylalkylsiloxane. It is preferably a reactive polysiloxane and a silicone leveling agent. By using a reactive polysilicone leveling agent, slidability can be imparted to the surface of the hard coat layer, and excellent scratch resistance can be maintained for a long period of time. On the other hand, when the silicone leveling agent is used, the film forming ability can be improved.

就反應性聚矽氧之調平劑而言，可列舉具有矽氧烷鍵與丙烯醯基或羥基者。具體例，可列舉如以下之共聚物。(a)二甲基矽氧烷/3-丙烯醯基-2-羥基丙氧基丙基矽氧烷/2-丙烯醯基-3-羥基丙氧基丙基矽氧烷之共聚物、(b)二甲基矽氧烷/羥基丙基矽氧烷/三(ω-異氰酸基烷基)異三聚氰酸/脂肪族聚酯之共聚物、(c)二甲基矽氧烷/末端為丙烯酸酯之聚伸烷二醇烷基 矽氧烷/末端為羥基之聚伸烷二醇烷基矽氧烷之共聚物。 Examples of the leveling agent of reactive polysiloxane include those having a siloxane bond and an acryl group or hydroxyl group. Specific examples include the following copolymers. (a) Copolymer of dimethylsiloxane/3-propenyl-2-hydroxypropoxypropylsiloxane/2-propenyl-3-hydroxypropoxypropylsiloxane, ( b) Copolymer of dimethylsiloxane/hydroxypropylsiloxane/tris(ω-isocyanatoalkyl)isocyanuric acid/aliphatic polyester, (c)dimethylsiloxane /Polyalkylene glycol alkyl terminated with acrylate Copolymer of siloxane/polyalkylene glycol alkyl siloxane with hydroxyl groups at the end.

若列舉市售之反應性聚矽氧之具體例，皆以商品名表示，有：DIC股份有限公司所販售之“GRANDIC(註冊商標)PC-4100”、BYK Chemie Japan股份有限公司所販售之“BYK-UV3500”、“BYK-UV3750”、“BYK-370”、“BYK-371”、“BYK-375”、及“BYK-377”等。 Specific examples of commercially available reactive polysiloxanes are listed under trade names, including: "GRANDIC (registered trademark) PC-4100" sold by DIC Corporation, and sold by BYK Chemie Japan Co., Ltd. The "BYK-UV3500", "BYK-UV3750", "BYK-370", "BYK-371", "BYK-375", "BYK-377" and so on.

藉由使用以上所例示之丙烯酸系黏結劑成分(黏結劑樹脂)，可在提升與保護膜之密著性的同時亦提升機械強度，並可形成能夠有效防止表面受傷之表面處理層20。 By using the acrylic adhesive component (adhesive resin) exemplified above, the mechanical strength can be improved while improving the adhesion with the protective film, and the surface treatment layer 20 that can effectively prevent surface injuries can be formed.

藉由壓印法設置具有細微表面凹凸形狀之硬塗層時，於樹脂膜上形成未硬化之硬塗層，在對其按壓形成有細微凹凸形狀之模具的同時使該硬塗層硬化，使模具的形狀轉印到該硬塗層即可。模具形狀對硬塗層之轉印較佳係藉由壓印來進行，就壓印而言，較佳係使用屬於光硬化性樹脂的一種之紫外線硬化性樹脂之UV壓印法。藉由壓印法形成細微表面凹凸形狀時，硬塗層可含有或不含無機或有機微粒子。 When the hard coat layer with fine surface unevenness is provided by the imprint method, an unhardened hard coat layer is formed on the resin film, and the hard coat layer is hardened while pressing the mold formed with the fine unevenness to make The shape of the mold can be transferred to the hard coat layer. The transfer of the shape of the mold to the hard coat layer is preferably performed by imprinting. For imprinting, it is preferably a UV imprinting method using an ultraviolet curable resin which is a type of photocurable resin. When the fine surface unevenness is formed by the imprint method, the hard coat layer may or may not contain inorganic or organic fine particles.

UV壓印法中，於保護膜表面形成紫外線硬化性樹脂層，在使該紫外線硬化性樹脂層按壓至模具凹凸面的同時進行硬化，藉此而使模具凹凸面轉印於紫外線硬化性樹脂層。具體而言，於樹脂膜上塗佈紫外線硬化性樹脂，在使經塗佈之紫外線硬化性樹脂與模具凹凸面密著之狀態，從樹脂膜側照射紫外線而使紫外線硬化性樹脂硬 化，然後，將形成有硬化後之紫外線硬化性樹脂層之樹脂膜從模具剝離，藉此使模具形狀轉印於紫外線硬化性樹脂。紫外線硬化性樹脂之種類無特別限制，例如可使用前述者。又，亦可使用藉由適當地選定光聚合起始劑而能以波長比紫外線長之可見光進行硬化之可見光硬化性樹脂來代替紫外線硬化性樹脂。 In the UV imprinting method, an ultraviolet-curable resin layer is formed on the surface of the protective film, and the ultraviolet-curable resin layer is pressed against the concave-convex surface of the mold while curing, thereby transferring the concave-convex surface of the mold to the ultraviolet-curable resin layer . Specifically, the ultraviolet curable resin is coated on the resin film, and in a state where the coated ultraviolet curable resin is in close contact with the uneven surface of the mold, the ultraviolet curable resin is irradiated from the resin film side to harden the ultraviolet curable resin Then, the resin film formed with the cured ultraviolet curable resin layer is peeled from the mold, thereby transferring the shape of the mold to the ultraviolet curable resin. The type of ultraviolet curable resin is not particularly limited, and for example, the aforementioned ones can be used. Furthermore, instead of the ultraviolet curable resin, a visible light curable resin that can be cured with visible light having a longer wavelength than ultraviolet light by appropriately selecting a photopolymerization initiator can be used.

表面處理層20之厚度無特別限定，但較佳係2至30μm，更佳係3至30μm之範圍。表面處理層20之厚度低於2μm時，變得難以得到充分的硬度，會有表面變得容易受傷之傾向。又，其厚度大於30μm時，會有變得容易破裂、或表面處理層之硬化收縮導致第1保護膜12A捲曲而使生產性降低之傾向。 The thickness of the surface treatment layer 20 is not particularly limited, but it is preferably in the range of 2 to 30 μm, more preferably in the range of 3 to 30 μm. When the thickness of the surface treatment layer 20 is less than 2 μm, it becomes difficult to obtain sufficient hardness, and the surface tends to be easily injured. In addition, when the thickness is greater than 30 μm, the first protective film 12A tends to be easily cracked or the hardening shrinkage of the surface treatment layer curls, which reduces productivity.

第1保護膜12A，如同前述，較佳係藉由硬塗層賦予霧度，但亦可藉由在形成硬塗層的同時，於保護膜中分散無機或有機微粒子而賦予霧度。為此所使用之無機或有機微粒子之具體例，係與上述所揭示者相同。 The first protective film 12A, as described above, is preferably provided with a haze by a hard coat layer, but it can also be provided by dispersing inorganic or organic fine particles in the protective film while forming the hard coat layer. Specific examples of the inorganic or organic fine particles used for this purpose are the same as those disclosed above.

對於第1保護膜12A，除了兼任硬塗層之前述防眩處理(霧度賦予處理)之外，亦可施行如抗靜電處理、防污處理、或抗菌處理等各種追加之表面處理，亦可形成由液晶性化合物或其高分子量化合物等所成之塗層。再者，抗靜電功能除了表面處理以外，亦可賦予於例如黏著劑層等偏光板的其他部分。 For the first protective film 12A, in addition to the aforementioned anti-glare treatment (haze imparting treatment) that also serves as a hard coat layer, various additional surface treatments such as antistatic treatment, antifouling treatment, or antibacterial treatment can also be performed. Form a coating made of liquid crystal compounds or high molecular weight compounds. Furthermore, in addition to surface treatment, the antistatic function can also be imparted to other parts of the polarizing plate such as an adhesive layer.

[第2保護膜12B] [Second protective film 12B]

就第2保護膜12B而言，可為與第1保護膜12A相同之膜，亦可為不同之膜。 The second protective film 12B may be the same film as the first protective film 12A, or may be a different film.

就第2保護膜12B而言，從相位差值之調控容易且取得容易來看，較佳係含有纖維素系樹脂、聚烯烴系樹脂或丙烯酸系樹脂。在此所謂的聚烯烴系樹脂係包含鏈狀聚烯烴系樹脂及環狀聚烯烴系樹脂。 The second protective film 12B preferably contains cellulose-based resins, polyolefin-based resins, or acrylic-based resins since it is easy to adjust the phase difference value and is easy to obtain. Here, the so-called polyolefin resin includes chain polyolefin resin and cyclic polyolefin resin.

就纖維素系樹脂而言，可使用與第1保護膜12A相同者。 For the cellulose resin, the same as the first protective film 12A can be used.

環狀聚烯烴系樹脂，係例如將降莰烯及其他環戊二烯衍生物等環狀烯烴單體在觸媒存在下聚合所得者。使用此種環狀聚烯烴系樹脂時，容易得到後述具有既定相位差值之保護膜。 The cyclic polyolefin resin is obtained, for example, by polymerizing cyclic olefin monomers such as norbornene and other cyclopentadiene derivatives in the presence of a catalyst. When such a cyclic polyolefin resin is used, it is easy to obtain a protective film having a predetermined phase difference value described later.

就環狀聚烯烴系樹脂而言，可列舉例如：將從環戊二烯與烯烴類或(甲基)丙烯酸或其酯類藉由狄耳士-阿德爾反應(Diels-Alder reaction)所得之降莰烯或其衍生物作為單體進行開環移位聚合，並藉由其後續之氫化而得之樹脂；將從二環戊二烯與烯烴類或(甲基)丙烯酸或其酯類藉由狄耳士-阿德爾反應所得之四環十二烯或其衍生物作為單體進行開環移位聚合，並藉由其後續之氫化而得之樹脂；將選自降莰烯、四環十二烯、該等之衍生物、及其他環狀烯烴單體中之至少2種單體同樣進行開環移位共聚合，並藉由其後續之氫化而得之樹脂；使降莰烯、四環十二烯、或該等之衍生物等環狀烯烴，與鏈狀烯烴及/或具有乙烯基之芳香族化合物進行加成共聚合所得之樹脂等。 Examples of cyclic polyolefin resins include, for example, those obtained by a Diels-Alder reaction from cyclopentadiene and olefins or (meth)acrylic acid or its esters Resin obtained by carrying out ring-opening shift polymerization of norbornene or its derivatives as monomers and subsequent hydrogenation; borrowed from dicyclopentadiene and olefins or (meth)acrylic acid or its esters Tetracyclododecene or its derivative obtained by Diels-Adel reaction as a monomer for ring-opening shift polymerization, and resin obtained by subsequent hydrogenation; will be selected from norbornene, tetracyclo Dodecene, derivatives of these, and at least two monomers among other cyclic olefin monomers are also subjected to ring-opening shift copolymerization, and a resin obtained by subsequent hydrogenation; Resin obtained by addition copolymerization of cyclic olefins such as tetracyclododecene, or derivatives thereof, and chain olefins and/or aromatic compounds having a vinyl group.

環狀聚烯烴系樹脂可容易取得市售品。若列舉市售品之例，分別以商品名表示，有：由TOPAS ADVANCED POLYMERS GmbH生產並且在日本由POLYPLASTICS股份有限公司所販售之“TOPAS”、JSR股份有限公司所販售之“ARTON(註冊商標)”、日本Zeon股份有限公司所販售之“ZEONOR(註冊商標)”及“ZEONEX(註冊商標)”、三井化學股份有限公司所販售之“APEL(註冊商標)”等。 The cyclic polyolefin-based resin can be easily obtained on the market. If listed as examples of commercially available products, they are indicated by trade names, respectively: "TOPAS" manufactured by TOPAS ADVANCED POLYMERS GmbH and sold by POLYPLASTICS Co., Ltd. in Japan, and "ARTON (registered "Trademark)", "ZEONOR (registered trademark)" and "ZEONEX (registered trademark)" sold by Zeon Corporation, Japan, and "APEL (registered trademark)" sold by Mitsui Chemicals Corporation, etc.

鏈狀聚烯烴系樹脂之典型例為聚乙烯系樹脂及聚丙烯系樹脂。其中，可適合使用：丙烯之均聚物；或者是以丙烯為主體，並使可與丙烯共聚合之共聚單體(例如乙烯)以1至20重量%之比率，較佳係以3至10重量%之比率共聚合而成之共聚物。 Typical examples of chain polyolefin resins are polyethylene resins and polypropylene resins. Among them, it can be suitably used: a homopolymer of propylene; or a propylene-based comonomer copolymerizable with propylene (for example, ethylene) at a ratio of 1 to 20% by weight, preferably 3 to 10 A copolymer made by copolymerization at a ratio of% by weight.

聚丙烯系樹脂可含有脂環族飽和烴樹脂。藉由含有脂環族飽和烴樹脂，變得容易調控相位差值。相對於聚丙烯系樹脂，脂環族飽和烴樹脂之含量係以設為0.1至30重量%較有利，更佳之含量係3至20重量%。脂環族飽和烴樹脂之含量未達0.1重量%時，無法充分得到調控相位差值之效果，另一方面，其含量超過30重量%時，會有從保護膜經時性地產生脂環族飽和烴樹脂的滲出(bleed out)之疑慮。 The polypropylene-based resin may contain an alicyclic saturated hydrocarbon resin. By containing alicyclic saturated hydrocarbon resin, it becomes easy to adjust the phase difference value. Relative to the polypropylene-based resin, the content of the alicyclic saturated hydrocarbon resin is preferably set to 0.1 to 30% by weight, and the more preferable content is 3 to 20% by weight. When the content of the alicyclic saturated hydrocarbon resin is less than 0.1% by weight, the effect of adjusting the phase difference cannot be sufficiently obtained. On the other hand, when the content exceeds 30% by weight, the alicyclic resin may be generated from the protective film over time. There is doubt about saturated hydrocarbon resin bleed out.

丙烯酸系樹脂，典型上為含有50重量%以上之甲基丙烯酸甲酯單元之聚合物。甲基丙烯酸甲酯單元之含量較佳係70重量%以上，亦可為100重量%。 Acrylic resins are typically polymers containing more than 50% by weight of methyl methacrylate units. The content of the methyl methacrylate unit is preferably 70% by weight or more, or 100% by weight.

從如上述之樹脂製膜成薄膜之方法，只要適當地選擇因應各個樹脂之方法即可，例如可採用上述溶劑鑄造法、熔融擠製法等。其中，對於聚烯烴系樹脂、丙烯酸系樹脂，從生產性之觀點來看，較佳係採用熔融擠製法。另一方面，纖維素系樹脂一般係藉由溶劑鑄造法製膜。 The method for forming a film from the resin as described above may be selected as long as the method corresponding to each resin is appropriately selected. For example, the above-mentioned solvent casting method, melt extrusion method, etc. may be used. Among them, for polyolefin resins and acrylic resins, from the viewpoint of productivity, a melt extrusion method is preferably used. On the other hand, cellulose-based resins are generally produced by solvent casting.

當液晶單元為橫向電場(IPS：In-Plane Switching)模式時，為了不損害到該IPS模式液晶單元原本具有的廣視角特性，第2保護膜12B較佳係厚度方向之相位差值Rth在-10至10nm之範圍。厚度方向之相位差值Rth，係將從面內之平均折射率減去厚度方向之折射率後得到之值乘以膜之厚度所得之值，並且係以下述式(a)來定義。又，面內之相位差值Re，係將面內之折射率差乘以膜之厚度所得之值，並且係以下述式(b)來定義。 When the liquid crystal cell is in the In-Plane Switching (IPS) mode, in order not to damage the wide viewing angle characteristic originally possessed by the IPS mode liquid crystal cell, the second protective film 12B preferably has a phase difference value Rth in the thickness direction of − The range of 10 to 10 nm. The phase difference value Rth in the thickness direction is a value obtained by subtracting the refractive index in the thickness direction from the in-plane average refractive index multiplied by the thickness of the film, and is defined by the following formula (a). In addition, the in-plane phase difference value Re is a value obtained by multiplying the in-plane refractive index difference by the thickness of the film, and is defined by the following formula (b).

Rth=[(n_x+n_y)/2-n_z]×d (a) Rth=[(n _x +n _y )/2-n _z ]×d (a)

Re=(n_x-n_y)×d (b) Re=(n _x -n _y )×d (b)

式中，n_x係膜面內之x軸方向(面內慢軸方向)之折射率，n_y係膜面內之y軸方向(面內快軸方向，且係在面內與x軸直交之方向)之折射率，n_z係與膜面垂直之z軸方向(厚度方向)之折射率，然後，d係膜之厚度。 In the formula, n _x is the refractive index in the x-axis direction (in-plane slow axis direction) of the film surface, n _y is the y-axis direction in the film surface (in-plane fast axis direction, and is orthogonal to the x axis in the plane) Direction), n _z is the refractive index in the z-axis direction (thickness direction) perpendicular to the film surface, and then d is the thickness of the film.

在此，相位差值可為在可見光之中心附近之500至650nm左右之範圍且任意波長之值，但本說明書中係以在波長590nm之相位差值為標準。厚度方向之相位差值Rth及面內之相位差值Re可使用市售之各種相位差計來測定。 Here, the phase difference value may be in the range of about 500 to 650 nm near the center of visible light and a value at any wavelength, but in this specification, the phase difference value at a wavelength of 590 nm is used as a standard. The phase difference value Rth in the thickness direction and the in-plane phase difference value Re can be measured using various commercially available phase difference meters.

就將樹脂膜之厚度方向之相位差值Rth調控為在-10至10nm之範圍內之方法而言，可列舉在製作膜時，盡量使殘留在厚度方向之變形變小之方法。例如，上述溶劑鑄造法中，可採用將在使該流延樹脂溶液乾燥時產生之厚度方向之殘留收縮變形藉由熱處理而緩和之方法等。另一方面，上述熔融擠製法中，為了防止在將樹脂膜從模具擠出到冷卻為止之期間延伸，可採用盡量縮減從模具到冷卻滾筒為止之距離，並且以使膜不會延伸之方式調控擠出量與冷卻滾筒之旋轉速度之方法等。又，與溶劑鑄造法同樣地，可採用藉由熱處理使殘留在所得之膜之變形緩和之方法。 As a method of adjusting the phase difference value Rth in the thickness direction of the resin film to be in the range of -10 to 10 nm, a method of reducing the deformation remaining in the thickness direction as much as possible when producing the film can be cited. For example, in the above-mentioned solvent casting method, a method of alleviating the residual shrinkage deformation in the thickness direction generated when the casting resin solution is dried by heat treatment can be used. On the other hand, in the above-mentioned melt extrusion method, in order to prevent the extension of the resin film from the die to the cooling period, the distance from the die to the cooling drum can be reduced as much as possible, and the film can be controlled so as not to stretch The method of extrusion and the rotation speed of the cooling drum. In addition, as with the solvent casting method, a method of alleviating the deformation of the remaining film by heat treatment can be used.

[第3保護膜15] [3rd protective film 15]

第3保護膜15可使用與第1保護膜12A同樣的樹脂膜。第3保護膜15可為與第1保護膜12A相同之膜，亦可為不同之膜。就第3保護膜15而言，從相位差值之調控容易且取得容易之觀點來看，較佳係纖維素系樹脂。就纖維素系樹脂膜而言，可使用與第1保護膜12A相同者。 The third protective film 15 can use the same resin film as the first protective film 12A. The third protective film 15 may be the same film as the first protective film 12A, or may be a different film. The third protective film 15 is preferably a cellulose-based resin from the viewpoint of easy adjustment of the phase difference value and easy acquisition. For the cellulose resin film, the same as the first protective film 12A can be used.

為了抑制第3保護膜15所致之消偏光導致之複合偏光板之偏光度降低，第3保護膜15較佳係在波長590nm之面內之相位差值Re(590)為10nm以下，且在波長590nm之厚度方向之相位差值Rth(590)之絕對值為10nm以下。 In order to suppress the decrease in the polarization degree of the composite polarizer caused by the depolarization caused by the third protective film 15, the third protective film 15 preferably has a phase difference value Re(590) in the plane of wavelength 590nm of 10nm or less, and The absolute value of the phase difference value Rth(590) in the thickness direction at a wavelength of 590 nm is 10 nm or less.

就將第3保護膜之厚度方向之相位差值Rth 調控為在10nm以下之範圍內之方法而言，只要使用與第2保護膜同樣之手法即可。 The thickness difference of the third protective film in the thickness direction Rth As for the method of adjusting to within the range of 10 nm or less, it is only necessary to use the same method as the second protective film.

[偏光膜與保護膜之貼合] [Lamination of polarizing film and protective film]

可藉由接著劑或黏著劑來進行第1偏光膜11A與第1保護膜12A之貼合、第2偏光膜11B與第2保護膜12B之貼合、以及第1偏光膜11A與第3保護膜15或第2偏光膜11B與第3保護膜15之貼合。 The bonding of the first polarizing film 11A and the first protective film 12A, the bonding of the second polarizing film 11B and the second protective film 12B, and the first polarizing film 11A and the third protection can be performed by an adhesive or an adhesive The film 15 or the second polarizing film 11B is bonded to the third protective film 15.

本說明書中，有時將第1偏光膜11A與第2偏光膜11B合稱而簡稱為偏光膜，將第1保護膜12A、第2保護膜12B與第3保護膜15合稱而簡稱為保護膜。 In this specification, the first polarizing film 11A and the second polarizing film 11B may be collectively referred to as a polarizing film, and the first protective film 12A, the second protective film 12B and the third protective film 15 may be collectively referred to as a protective. membrane.

將偏光膜與保護膜貼合之接著劑層，可將其厚度設為0.01至30μm左右，較佳係0.01至10μm，更佳係0.05至5μm。只要接著劑層之厚度在該範圍，則積層之保護膜與偏光膜之間不會產生浮起或剝離，可得到實用上沒有問題之接著力。將偏光膜與保護膜貼合之黏著劑層，可將其厚度設為5至50μm左右，較佳係5至30μm，更佳係10至25μm。 The thickness of the adhesive layer to which the polarizing film and the protective film are bonded can be set to about 0.01 to 30 μm, preferably 0.01 to 10 μm, more preferably 0.05 to 5 μm. As long as the thickness of the adhesive layer is within this range, no floating or peeling occurs between the laminated protective film and the polarizing film, and practically no adhesive force can be obtained. The thickness of the adhesive layer for bonding the polarizing film and the protective film can be set to about 5 to 50 μm, preferably 5 to 30 μm, and more preferably 10 to 25 μm.

接著劑層之形成，可依被黏附體之種類及目的而使用適宜、適當的接著劑，又，亦可視需要而使用錨定塗佈劑(anchor coating agent)。就接著劑而言，可列舉例如：溶劑型接著劑、乳液型接著劑、感壓性接著劑、再濕性接著劑、聚縮合型接著劑、無溶劑型接著劑、膜狀接著劑、熱熔型接著劑等。 For the formation of the adhesive layer, an appropriate and appropriate adhesive can be used according to the type and purpose of the adherend, and an anchor coating agent can also be used as needed. Examples of the adhesive include solvent adhesives, emulsion adhesives, pressure-sensitive adhesives, rewet adhesives, polycondensation adhesives, solventless adhesives, film adhesives, and heat. Melt adhesives, etc.

就較佳之接著劑之一而言，可列舉水系接著劑，亦即接著劑成分溶解或分散於水中者。若列舉可溶解於水之接著劑成分之例，則有聚乙烯醇系樹脂。又，若列舉可分散於水之接著劑成分之例，則有具有親水基之胺甲酸酯系樹脂。水系接著劑，可藉由將此種接著劑成分與視需要所調配之追加的添加劑一起混合於水中而調製。若列舉可成為水系接著劑之市售之聚乙烯醇系樹脂之例，則有：KURARAY股份有限公司所販售之羧基改質聚乙烯醇之“KL-318”等。 As one of the preferable adhesives, water-based adhesives can be cited, that is, those whose components of the adhesive are dissolved or dispersed in water. If an example of an adhesive component soluble in water is given, there is a polyvinyl alcohol-based resin. In addition, if an example of an adhesive component that can be dispersed in water is cited, there are urethane resins having a hydrophilic group. The water-based adhesive can be prepared by mixing such an adhesive component with additional additives formulated as necessary in water. Examples of commercially available polyvinyl alcohol-based resins that can be used as water-based adhesives include "KL-318" of carboxy-modified polyvinyl alcohol sold by KURARAY Corporation.

水系接著劑可視需要而含有交聯劑。若列舉交聯劑之例，則有：胺化合物、醛化合物、羥甲基化合物、水溶性環氧樹脂、異氰酸酯化合物、多價金屬鹽等。將聚乙烯醇系樹脂作為接著劑成分時，較佳可使用以乙二醛為首之醛化合物、以羥甲基三聚氰胺為首之羥甲基化合物、水溶性環氧樹脂等作為交聯劑。在此，水溶性環氧樹脂，可為例如使聚醯胺多胺與表氯醇反應所得之聚醯胺環氧樹脂，該聚醯胺多胺係屬於二伸乙三胺或三伸乙四胺等聚伸烷多胺與己二酸等二羧酸之反應物。若列舉水溶性環氧樹脂之市售品之例，則有：田岡化學工業股份有限公司所販售之“Sumirez Resin(註冊商標)650(30)”等。 The water-based adhesive may contain a cross-linking agent if necessary. Examples of crosslinking agents include amine compounds, aldehyde compounds, methylol compounds, water-soluble epoxy resins, isocyanate compounds, and polyvalent metal salts. When a polyvinyl alcohol-based resin is used as an adhesive component, an aldehyde compound including glyoxal, a methylol compound including methylolmelamine, a water-soluble epoxy resin, and the like can be preferably used as a crosslinking agent. Here, the water-soluble epoxy resin may be, for example, a polyamide epoxy resin obtained by reacting polyamide polyamine with epichlorohydrin. The polyamide polyamine belongs to diethylenetriamine or triethylenetetramine The reactant of polyalkylene polyamine such as amine and dicarboxylic acid such as adipic acid. Examples of commercially available water-soluble epoxy resins include "Sumirez Resin (registered trademark) 650 (30)" sold by Takaoka Chemical Industry Co., Ltd.

可藉由在偏光膜及/或貼合於該偏光膜之保護膜之接著面塗佈水系接著劑，並使兩者貼合後，施以乾燥處理，而得到偏光板。在進行接著之前，若事先對保護膜施以皂化處理、電暈放電處理、電漿處理、或底塗(primer) 處理等易接著處理以提高濕潤性係亦為有效。乾燥溫度可設為例如50至100℃左右。乾燥處理後，在比室溫略高之溫度，例如30至50℃左右之溫度熟化1至10天左右，就進一步提高接著力而言為較佳。 The polarizing plate can be obtained by applying an aqueous adhesive on the bonding surface of the polarizing film and/or the protective film bonded to the polarizing film, and bonding the two, followed by drying treatment. Before proceeding, if the protective film is subjected to saponification treatment, corona discharge treatment, plasma treatment, or primer It is also effective for easy follow-up treatment such as treatment to improve wettability. The drying temperature can be set to, for example, about 50 to 100°C. After the drying process, it is aged at a temperature slightly higher than room temperature, for example, at a temperature of about 30 to 50° C. for about 1 to 10 days, which is preferable in terms of further improving the adhesion.

就另一較佳之接著劑而言，可列舉含有藉由活性能量線之照射或加熱而硬化之環氧化合物之硬化性接著劑組成物。在此，硬化性環氧化合物係分子內具有至少2個環氧基者。此時，偏光膜與保護膜之接著，可藉由對該接著劑組成物之塗佈層照射活性能量線或賦予熱而使接著劑所含之硬化性環氧化合物硬化之方法來進行。環氧化合物之硬化，一般係藉由環氧化合物之陽離子聚合來進行。又，從生產性之觀點來看，該硬化較佳係藉由活性能量線之照射來進行。 As another preferable adhesive, a hardening adhesive composition containing an epoxy compound hardened by irradiation or heating of active energy rays can be cited. Here, those having at least two epoxy groups in the molecule of the curable epoxy compound. At this time, the bonding of the polarizing film and the protective film can be performed by irradiating the coating layer of the adhesive composition with active energy rays or applying heat to harden the curable epoxy compound contained in the adhesive. The curing of epoxy compounds is generally carried out by cationic polymerization of epoxy compounds. In addition, from the viewpoint of productivity, the hardening is preferably performed by irradiation of active energy rays.

從耐候性、折射率、陽離子聚合性等之觀點來看，硬化性接著劑組成物所含之環氧化合物，較佳係分子內不含芳香環者。就分子內不含芳香環之環氧化合物而言，可例示氫化環氧化合物、脂環式環氧化合物、脂肪族環氧化合物等。適合使用於此種硬化性接著劑組成物之環氧化合物，例如已於日本特開2004-245925號公報中詳細說明，但在此亦大略說明。 From the viewpoint of weather resistance, refractive index, cationic polymerizability, etc., the epoxy compound contained in the curable adhesive composition is preferably one that does not contain an aromatic ring in the molecule. Examples of epoxy compounds containing no aromatic ring in the molecule include hydrogenated epoxy compounds, alicyclic epoxy compounds, and aliphatic epoxy compounds. An epoxy compound suitable for use in such a hardenable adhesive composition has been described in detail in Japanese Patent Laid-Open No. 2004-245925, for example, but it is also outlined here.

氫化環氧化合物，可為將使屬於芳香族環氧化合物之原料之芳香族多羥基化合物在觸媒存在下及加壓下選擇性進行核氫化反應所得之核氫化多羥基化合物進行環氧丙基醚化而成者。就屬於芳香族環氧化合物之原料 之芳香族多羥基化合物而言，可列舉例如：雙酚A、雙酚F、及雙酚S等雙酚類；苯酚酚醛清漆(phenol novolac)樹脂、甲酚酚醛清漆樹脂、及羥基苯甲醛苯酚酚醛清漆樹脂等酚醛清漆型樹脂；四羥基二苯基甲烷、四羥基二苯甲酮、及聚乙烯基苯酚等多官能型化合物等。可藉由使此種芳香族多羥基化合物進行核氫化反應，並使所得之核氫化多羥基化合物與表氯醇反應，而進行環氧丙基醚化。就適合的氫化環氧化合物而言，可列舉經氫化之雙酚A之環氧丙基醚。 Hydrogenated epoxy compound may be a glycidyl group obtained by subjecting an aromatic polyhydroxy compound which is a raw material of an aromatic epoxy compound to a nuclear hydrogenation reaction obtained by selective nuclear hydrogenation reaction in the presence of a catalyst and under pressure Etherified. Raw materials that belong to aromatic epoxy compounds Examples of aromatic polyhydroxy compounds include bisphenols such as bisphenol A, bisphenol F, and bisphenol S; phenol novolac resin, cresol novolac resin, and hydroxybenzaldehyde phenol Novolac resins such as novolac resins; polyfunctional compounds such as tetrahydroxydiphenylmethane, tetrahydroxybenzophenone, and polyvinylphenol. Epoxypropyl etherification can be carried out by subjecting such an aromatic polyhydroxy compound to a nuclear hydrogenation reaction and reacting the resulting nuclear hydrogenated polyhydroxy compound with epichlorohydrin. Examples of suitable hydrogenated epoxy compounds include hydrogenated glycidyl ethers of bisphenol A.

脂環式環氧化合物係分子內具有至少1個鍵結於脂環式環之環氧基之化合物。「鍵結於脂環式環之環氧基」係意指下述式所示之結構中之架橋之氧原子-O-，該式中，m係2至5之整數。 An alicyclic epoxy compound is a compound having at least one epoxy group bonded to an alicyclic ring in the molecule. "Epoxy group bonded to an alicyclic ring" means a bridged oxygen atom -O- in the structure represented by the following formula, in which m is an integer of 2 to 5.

將該式中之(CH₂)_m中之1個或複數個氫原子去除之形態之基與其他化學結構鍵結而成之化合物，係可成為脂環式環氧化合物。又，形成脂環式環之(CH₂)_m中之1個或複數個氫原子可經甲基、乙基等直鏈狀烷基適當地取代。脂環式環氧化合物之中，具有氧雜雙環己烷環(上述式中m=3者)、氧雜雙環庚烷環(上述式中m=4者)之環氧化合物因顯示優異之接著性，故可較佳使用。以下，揭示脂環式環氧化合物之具體例。在此，首先列舉化合物名，然後表示分別對應之化學式，化合物名與其對應之化學式係 附上相同符號。 The compound formed by bonding one or more hydrogen atoms in (CH ₂ ) _m in the formula to other chemical structures can become an alicyclic epoxy compound. In addition, one or more hydrogen atoms in (CH ₂ ) _m forming an alicyclic ring may be appropriately substituted with a linear alkyl group such as methyl or ethyl. Among the alicyclic epoxy compounds, epoxy compounds having an oxabicyclohexane ring (m=3 in the above formula) and an oxacyclocycloheptane ring (m=4 in the above formula) show excellent adhesion Sex, so it can be used better. Hereinafter, specific examples of the alicyclic epoxy compound will be disclosed. Here, the name of the compound is listed first, and then the corresponding chemical formulas are indicated respectively. The compound name and the corresponding chemical formula are appended with the same symbol.

A：3,4-環氧基環己烷甲酸3,4-環氧基環己基甲酯、B：3,4-環氧基-6-甲基環己烷甲酸3,4-環氧基-6-甲基環己基甲酯、C：伸乙基雙(3,4-環氧基環己烷甲酸酯)、D：己二酸雙(3,4-環氧基環己基甲基)酯、E：己二酸雙(3,4-環氧基-6-甲基環己基甲基)酯、F：二乙二醇雙(3,4-環氧基環己基甲基醚)、G：乙二醇雙(3,4-環氧基環己基甲基醚)、H：2,3,14,15-二環氧基-7,11,18,21-四氧雜三螺[5.2.2.5.2.2]二十一烷、I：3-(3,4-環氧基環己基)-8,9-環氧基-1,5-二氧雜螺[5.5]十一烷、J：4-乙烯基環己烯二氧化物、K：檸檬烯二氧化物、L：雙(2,3-環氧基環戊基)醚、M：二環戊二烯二氧化物等。 A: 3,4-epoxycyclohexanecarboxylic acid 3,4-epoxycyclohexyl methyl ester, B: 3,4-epoxy-6-methylcyclohexanecarboxylic acid 3,4-epoxy -6-methylcyclohexyl methyl ester, C: ethylidene bis(3,4-epoxycyclohexane formate), D: bis(3,4-epoxycyclohexylmethyl adipate) )Ester, E: bis(3,4-epoxy-6-methylcyclohexylmethyl) adipate, F: diethylene glycol bis(3,4-epoxycyclohexylmethyl ether) , G: ethylene glycol bis (3,4-epoxycyclohexyl methyl ether), H: 2,3,14,15-diepoxy-7,11,18,21-tetraoxa trispiro [5.2.2.5.2.2] Eicosane, I: 3-(3,4-epoxycyclohexyl)-8,9-epoxy-1,5-dioxaspiro[5.5]undecane , J: 4-vinylcyclohexene dioxide, K: limonene dioxide, L: bis(2,3-epoxycyclopentyl) ether, M: dicyclopentadiene dioxide, etc.

脂肪族環氧化合物可為脂肪族多元醇或其環氧烷(alkylene oxide)加成物之聚環氧丙基醚。更具體而 言，可列舉：丙二醇之二環氧丙基醚；1,4-丁烷二醇之二環氧丙基醚；1,6-己烷二醇之二環氧丙基醚；甘油之三環氧丙基醚；三羥甲基丙烷之三環氧丙基醚；對於乙二醇、丙二醇及甘油等脂肪族多元醇加成環氧烷(例如環氧乙烷、環氧丙烷)所得之聚醚多元醇之聚環氧丙基醚(例如聚乙二醇之二環氧丙基醚)等。 The aliphatic epoxy compound may be a polyglycidyl ether of an aliphatic polyhydric alcohol or an alkylene oxide adduct thereof. More specific and For example, diglycidyl ether of propylene glycol; diglycidyl ether of 1,4-butanediol; diglycidyl ether of 1,6-hexanediol; tricyclic glycerol Oxypropyl ether; triglycidoxypropyl ether of trimethylolpropane; polymer obtained by adding alkylene oxide (such as ethylene oxide and propylene oxide) to aliphatic polyols such as ethylene glycol, propylene glycol and glycerin Polyglycidyl ether of ether polyol (such as diglycidyl ether of polyethylene glycol) and the like.

硬化性接著劑組成物中，環氧化合物可單獨使用1種，亦可併用2種以上。其中，該環氧化合物較佳係含有分子內具有至少1個鍵結於脂環式環之環氧基之脂環式環氧化合物。 In the curable adhesive composition, one type of epoxy compound may be used alone, or two or more types may be used in combination. Among them, the epoxy compound preferably contains an alicyclic epoxy compound having at least one epoxy group bonded to an alicyclic ring in the molecule.

硬化性接著劑組成物所用之環氧化合物通常係具有30至3,000g/當量之範圍內之環氧當量，該環氧當量較佳係50至1,500g/當量之範圍。使用環氧當量低於30g/當量之環氧化合物時，會有硬化後之偏光板之可撓性降低、或接著強度降低之可能性。另一方面，具有超過3,000g/當量之環氧當量之化合物，會有與接著劑組成物所含之其他成分的相溶性降低之可能性。 The epoxy compound used in the curable adhesive composition generally has an epoxy equivalent in the range of 30 to 3,000 g/equivalent, and the epoxy equivalent is preferably in the range of 50 to 1,500 g/equivalent. When an epoxy compound having an epoxy equivalent of less than 30 g/equivalent is used, there is a possibility that the flexibility of the polarizing plate after hardening may decrease, or the strength may subsequently decrease. On the other hand, a compound having an epoxy equivalent of more than 3,000 g/equivalent may reduce the compatibility with other components contained in the adhesive composition.

從反應性之觀點來看，較佳係使用陽離子聚合作為環氧化合物之硬化反應。為此，於含有環氧化合物之硬化性接著劑組成物中，較佳係調配陽離子聚合起始劑。陽離子聚合起始劑，係藉由可見光線、紫外線、X射線、及電子束等活性能量線之照射或加熱而產生陽離子種或路易斯酸，並使環氧基之聚合反應開始。從作業性之觀點來看，較佳係對陽離子聚合起始劑賦予潛在性。以下， 將藉由活性能量線之照射而產生陽離子種或路易斯酸並使環氧基之聚合反應開始之陽離子聚合起始劑稱為「光陽離子聚合起始劑」，將藉由熱而產生陽離子種或路易斯酸並使環氧基之聚合反應開始之陽離子聚合起始劑稱為「熱陽離子聚合起始劑」。 From the viewpoint of reactivity, it is preferable to use cationic polymerization as the hardening reaction of the epoxy compound. For this reason, it is preferable to mix a cationic polymerization initiator in the hardenable adhesive composition containing an epoxy compound. The cationic polymerization initiator generates a cationic species or a Lewis acid by irradiation or heating of active energy rays such as visible rays, ultraviolet rays, X-rays, and electron beams, and starts the polymerization reaction of epoxy groups. From the viewpoint of workability, it is preferable to impart potentiality to the cationic polymerization initiator. the following, The cationic polymerization initiator that generates cationic species or Lewis acid by the irradiation of active energy rays and initiates the polymerization reaction of epoxy groups is called "photocationic polymerization initiator", and the cationic species or The cationic polymerization initiator that causes the Lewis acid to start the polymerization reaction of the epoxy group is called "thermal cationic polymerization initiator".

使用光陽離子聚合起始劑並藉由活性能量線之照射進行而接著劑組成物之硬化之方法，就可在常溫常濕下進行硬化、且減少考慮偏光膜之耐熱性或膨脹所致之變形的需要、並可使保護膜與偏光膜良好地接著之特點而言為有利。又，光陽離子聚合起始劑係藉由光發揮催化作用，故即使與環氧化合物混合，其保存安定性、作業性仍優異。 The method of curing the adhesive composition by using photo-cationic polymerization initiator and irradiating with active energy rays can cure at normal temperature and humidity, and reduce the deformation caused by considering the heat resistance or expansion of the polarizing film It is advantageous in terms of the need for the protective film and the polarizing film to be adhered well. In addition, the photo-cationic polymerization initiator exerts a catalytic effect by light, so even if it is mixed with an epoxy compound, its storage stability and workability are still excellent.

就光陽離子聚合起始劑而言，可列舉例如：芳香族重氮鹽；芳香族錪鹽及芳香族鋶鹽等鎓鹽、鐵-重烯(allene)錯合物等。相對於環氧化合物100重量份，光陽離子聚合起始劑之調配量通常係0.5至20重量份，較佳係1重量份以上，且較佳係15重量份以下。相對於環氧化合物100重量份，光陽離子聚合起始劑之調配量低於0.5重量份時，硬化變得不充分，會有硬化物之機械強度、接著強度降低之傾向。另一方面，相對於環氧化合物100重量份，光陽離子聚合起始劑之調配量超過20重量份時，硬化物中之離子性物質增加而使硬化物之吸濕性變高，會有耐久性能降低之可能性。 Examples of the photo-cationic polymerization initiator include aromatic diazonium salts; onium salts such as aromatic iodonium salts and aromatic cerium salts, and iron-allene complexes. The formulation amount of the photocationic polymerization initiator is usually 0.5 to 20 parts by weight, preferably 1 part by weight or more, and preferably 15 parts by weight or less with respect to 100 parts by weight of the epoxy compound. When the amount of the photocationic polymerization initiator is less than 0.5 parts by weight relative to 100 parts by weight of the epoxy compound, the curing becomes insufficient, and the mechanical strength and subsequent strength of the cured product tend to decrease. On the other hand, when the amount of the photocationic polymerization initiator exceeds 20 parts by weight with respect to 100 parts by weight of the epoxy compound, the ionic substance in the hardened material increases, so that the hygroscopicity of the hardened material becomes high and there is durability Possibility of reduced performance.

使用光陽離子聚合起始劑時，硬化性接著 劑組成物可視需要而進一步含有光增感劑。藉由使用光增感劑，可使陽離子聚合之反應性提升，並使硬化物之機械強度、接著強度提升。就光增感劑而言，可列舉例如：羰基化合物、有機硫化合物、過硫化物、氧化還原系化合物、偶氮化合物、重氮化合物、鹵化合物、光還原性色素等。調配光增感劑時，相對於硬化性接著劑組成物100重量份，光增感劑之量較佳係在0.1至20重量份之範圍內。又，為了提升硬化速度，可使用萘醌衍生物等增感助劑。 When using photo-cationic polymerization initiator, The agent composition may further contain a photosensitizer if necessary. By using a light sensitizer, the reactivity of cationic polymerization can be improved, and the mechanical strength and subsequent strength of the hardened product can be improved. Examples of the photosensitizer include carbonyl compounds, organic sulfur compounds, persulfides, redox compounds, azo compounds, diazo compounds, halogen compounds, and photoreducible dyes. When blending the photosensitizer, the amount of the photosensitizer is preferably in the range of 0.1 to 20 parts by weight with respect to 100 parts by weight of the curable adhesive composition. In addition, in order to increase the curing rate, sensitizing aids such as naphthoquinone derivatives can be used.

另一方面，就熱陽離子聚合起始劑而言，可列舉：苯甲基鋶鹽、噻吩鎓鹽、四氫噻吩鎓鹽、苯甲基銨、吡啶鎓鹽、肼鎓鹽(hydrazinium salt)、羧酸鹽、磺酸鹽、胺醯亞胺等。 On the other hand, examples of the thermal cationic polymerization initiator include benzyl alkane salt, thienium salt, tetrahydrothienium salt, benzyl ammonium, pyridinium salt, hydrazinium salt, Carboxylates, sulfonates, amides, etc.

含有環氧化合物之硬化性接著劑組成物，較佳係如同前述藉由光陽離子聚合而硬化，但亦可使上述熱陽離子聚合起始劑存在並藉由熱陽離子聚合而硬化，也可併用光陽離子聚合與熱陽離子聚合。當併用光陽離子聚合與熱陽離子聚合時，硬化性接著劑組成物較佳係含有光陽離子聚合起始劑與熱陽離子聚合起始劑兩者。 The hardening adhesive composition containing an epoxy compound is preferably hardened by photocationic polymerization as described above, but the above thermal cationic polymerization initiator may also be present and hardened by thermal cationic polymerization, or light may be used in combination Cationic polymerization and thermal cationic polymerization. When photocationic polymerization and thermal cationic polymerization are used in combination, the curable adhesive composition preferably contains both a photocationic polymerization initiator and a thermal cationic polymerization initiator.

又，硬化性接著劑組成物，可進一步含有氧雜環丁烷化合物、多元醇化合物等促進陽離子聚合之化合物。氧雜環丁烷化合物係分子內具有4員環醚之化合物。調配氧雜環丁烷化合物時，在硬化性接著劑組成物中，其量通常係5至95重量%，較佳係5至50重量%。又，多元醇化合物，可為包含乙二醇、六亞甲基二醇、聚乙二醇 等之伸烷二醇或其寡聚物、聚酯多元醇、聚己內酯多元醇、聚碳酸酯多元醇等。調配多元醇化合物時，在硬化性接著劑組成物中，其量通常係50重量%以下，較佳係30重量%以下。 In addition, the curable adhesive composition may further contain a compound that promotes cationic polymerization, such as an oxetane compound and a polyol compound. Oxetane compounds are compounds with a 4-membered cyclic ether in the molecule. When blending the oxetane compound, the amount of the curable adhesive composition is usually 5 to 95% by weight, preferably 5 to 50% by weight. In addition, the polyol compound may include ethylene glycol, hexamethylene glycol, and polyethylene glycol. Alkylene glycol or its oligomer, polyester polyol, polycaprolactone polyol, polycarbonate polyol, etc. When blending a polyol compound, the amount of the curable adhesive composition is usually 50% by weight or less, preferably 30% by weight or less.

再者，硬化性接著劑組成物，在無損其接著性之情況下，可含有其他添加劑，例如：離子阱劑、抗氧化劑、鏈轉移劑、增感劑、賦黏劑、熱塑性樹脂、填充劑、流動調整劑、塑化劑、消泡劑等。就離子阱劑而言，可列舉例如：包含粉末狀之鉍系、銻系、鎂系、鋁系、鈣系、鈦系、該等之混合系等之無機化合物，就抗氧化劑而言，可列舉例如受阻苯酚系抗氧化劑等。 Furthermore, the curable adhesive composition may contain other additives such as: ion trapping agent, antioxidant, chain transfer agent, sensitizer, tackifier, thermoplastic resin, filler without compromising its adhesiveness , Flow regulator, plasticizer, defoamer, etc. Examples of the ion trapping agent include inorganic compounds including powdered bismuth-based, antimony-based, magnesium-based, aluminum-based, calcium-based, titanium-based, and mixtures of these, and antioxidants may be used. Examples include hindered phenol antioxidants.

將含有環氧化合物之硬化性接著劑組成物塗佈於偏光膜或保護膜之接著面、或者該等雙方之接著面之後，以塗佈有接著劑之面貼合，照射活性能量線或加熱而使未硬化之接著劑層硬化，可使偏光膜與保護膜接著。就接著劑之塗佈方法而言，例如可採用刮刀(doctor blade)、線棒、模具塗佈、缺角輪塗佈機(comma coater)、凹版塗佈機等各種塗佈方式。 After applying the hardening adhesive composition containing an epoxy compound to the adhesive surface of the polarizing film or the protective film, or the adhesive surface of both, the surface coated with the adhesive is bonded, and the active energy ray is irradiated or heated By hardening the uncured adhesive layer, the polarizing film and the protective film can be adhered. As for the coating method of the adhesive, various coating methods such as doctor blade, wire bar, die coating, comma coater, and gravure coater can be used.

該硬化性接著劑組成物，基本上可作為實質上不含溶劑之無溶劑型接著劑使用，但各塗佈方式有各自最適宜的黏度範圍，因此，亦可為了黏度調整而含有溶劑。溶劑較佳係不會使偏光膜之光學性能降低，且良好地溶解以環氧化合物為首之各成分之有機溶劑，例如可使用以甲苯為代表之烴類、以乙酸乙酯為代表之酯類等。 This hardenable adhesive composition can basically be used as a solventless adhesive that does not substantially contain a solvent. However, each coating method has its own optimum viscosity range. Therefore, a solvent may be included for viscosity adjustment. The solvent is preferably an organic solvent that does not degrade the optical properties of the polarizing film and dissolves the components including epoxy compounds, such as hydrocarbons represented by toluene and esters represented by ethyl acetate. Wait.

藉由活性能量線之照射來進行接著劑組成物之硬化時，活性能量線可使用前述各種類者，但從操作容易且照射光量等之調控容易的觀點來看，較佳可使用紫外線。活性能量線(例如紫外線)之照射強度、照射量，係在不影響以偏光膜之偏光度為首之各種光學性能、及以保護膜之透明性及相位差特性為首之各種光學性能之範圍內，以保持適度的生產性之方式適當地決定。 When curing the adhesive composition by irradiation with active energy rays, the aforementioned various types of active energy rays can be used. However, from the viewpoint of ease of operation and ease of control of the amount of light irradiation and the like, it is preferable to use ultraviolet rays. The irradiation intensity and irradiation amount of active energy rays (such as ultraviolet rays) are within a range that does not affect various optical properties such as the polarization degree of the polarizing film, and various optical properties including the transparency and phase difference characteristics of the protective film. Appropriately decided in a way that maintains moderate productivity.

藉由熱來進行接著劑組成物之硬化時，可用一般已知之方法加熱。通常，在硬化性接著劑組成物中調配之熱陽離子聚合起始劑係在產生陽離子種、路易斯酸之溫度以上進行加熱，具體之加熱溫度係例如50至200℃左右。 When the adhesive composition is hardened by heat, it can be heated by a generally known method. Generally, the thermal cationic polymerization initiator formulated in the curable adhesive composition is heated above the temperature at which cationic species and Lewis acid are generated, and the specific heating temperature is, for example, about 50 to 200°C.

[第1偏光板與第2偏光板之積層] [Lamination of first polarizer and second polarizer]

第1偏光板與第2偏光板之積層，可使用和偏光膜與保護膜之貼合所用之接著劑相同者。就另一形態而言，第1偏光板與第2偏光板之積層使用黏著劑亦為較佳。 For the lamination of the first polarizing plate and the second polarizing plate, the same adhesive as that used for bonding the polarizing film and the protective film can be used. In another aspect, it is also preferable to use an adhesive for the lamination of the first polarizing plate and the second polarizing plate.

[黏著劑層13] [Adhesive layer 13]

第1偏光板與第2偏光板之積層所用之黏著劑層13只要係光學透明性優異且包含適度的濕潤性、凝集性、接著性等之黏著特性優異者即可，但較佳係進一步地耐久性等亦優異者。具體而言，形成黏著劑層13之黏著劑，較佳係含有丙烯酸系樹脂之黏著劑(丙烯酸系黏著劑)。 The adhesive layer 13 used for the lamination of the first polarizing plate and the second polarizing plate may be one that has excellent optical transparency and excellent adhesion characteristics including moderate wettability, agglomeration, and adhesion, but it is preferably further Those with excellent durability. Specifically, the adhesive forming the adhesive layer 13 is preferably an adhesive containing an acrylic resin (acrylic adhesive).

丙烯酸系黏著劑所含之丙烯酸系樹脂係以丙烯酸丁酯、丙烯酸乙酯、丙烯酸異辛酯、及丙烯酸2-乙基己酯等丙烯酸烷酯為主要單體之樹脂。該丙烯酸系樹脂通常共聚合有極性單體。極性單體係指具有聚合性不飽和鍵結及極性官能基之化合物，在此，聚合性不飽和鍵結，一般係源自(甲基)丙烯醯基者，又，極性官能基可為羧基、羥基、醯胺基、胺基、環氧基等。若列舉極性單體之具體例：(甲基)丙烯酸、(甲基)丙烯酸2-羥基丙酯、(甲基)丙烯酸2-羥基乙酯、(甲基)丙烯醯胺、(甲基)丙烯酸2-N,N-二甲基胺基乙酯、(甲基)丙烯酸環氧丙酯等。 The acrylic resin contained in the acrylic adhesive is a resin mainly composed of alkyl acrylate such as butyl acrylate, ethyl acrylate, isooctyl acrylate, and 2-ethylhexyl acrylate. The acrylic resin is usually copolymerized with a polar monomer. Polar single system refers to a compound having a polymerizable unsaturated bond and a polar functional group. Here, the polymerizable unsaturated bond is generally derived from a (meth)acryloyl group, and the polar functional group may be a carboxyl group , Hydroxyl, amide, amine, epoxy, etc. To give specific examples of polar monomers: (meth)acrylic acid, 2-hydroxypropyl (meth)acrylate, 2-hydroxyethyl (meth)acrylate, (meth)acrylamide, (meth)acrylic acid 2-N,N-dimethylaminoethyl, glycidyl (meth)acrylate, etc.

又，丙烯酸系黏著劑中，通常交聯劑係與丙烯酸系樹脂一起調配。交聯劑之代表例，可列舉分子內具有至少2個異氰酸基(-NCO)之異氰酸酯化合物。 In addition, in the acrylic adhesive, the crosslinking agent is usually formulated together with the acrylic resin. Representative examples of the crosslinking agent include isocyanate compounds having at least two isocyanate groups (-NCO) in the molecule.

黏著劑，可進一步調配各種添加劑。適合的添加劑，可列舉矽烷偶合劑、抗靜電劑等。矽烷偶合劑係就提高與玻璃之接著力而言為有效。抗靜電劑係就減少或防止靜電產生而言為有效。 Adhesives can be further formulated with various additives. Suitable additives include silane coupling agents and antistatic agents. The silane coupling agent is effective in improving the adhesion with glass. Antistatic agents are effective in reducing or preventing the generation of static electricity.

黏著劑層13可藉由下述方法來形成：調製使上述黏著劑成分溶解於有機溶劑中而成之黏著劑組成物，將其直接塗佈於欲接著之2片偏光板之貼合面(偏光膜或保護膜)之任一者，並將溶劑乾燥去除之方法；或者，將上述黏著劑組成物塗佈於施有離型處理之由樹脂膜所成之基材膜之離型處理面，將溶劑乾燥去除而作成黏著劑層，將其貼附於2片偏光板之貼合面(偏光膜或保護膜)之任一 者，並將黏著劑層轉印之方法。藉由前者之直接塗佈法形成黏著劑層13時，通常於其表面貼合施有離型處理之樹脂膜(亦稱為隔片(separator))，將黏著劑層表面暫時保護直到使用時為止。從屬於有機溶劑溶液之黏著劑組成物的操作性之觀點等來看，大多採用後者之轉印法，此時，從最初於形成黏著劑層時所用之經離型處理之基材膜在貼附於偏光板後可直接當作隔片之特點來看，亦為合適。 The adhesive layer 13 can be formed by preparing an adhesive composition obtained by dissolving the adhesive component in an organic solvent, and applying it directly to the bonding surface of two polarizing plates to be adhered ( Polarizing film or protective film), and the method of drying and removing the solvent; or, the above adhesive composition is applied to the release treatment surface of the base film made of resin film subjected to release treatment , The solvent is dried and removed to make an adhesive layer, and it is attached to any of the bonding surfaces (polarizing film or protective film) of two polarizing plates And transfer the adhesive layer. When the adhesive layer 13 is formed by the former direct coating method, a resin film (also called a separator) with a release treatment is usually attached to the surface to temporarily protect the surface of the adhesive layer until use until. From the viewpoint of the operability of the adhesive composition belonging to the organic solvent solution, the latter transfer method is mostly used. In this case, the substrate film that has been subjected to the release treatment used for the initial formation of the adhesive layer is attached. Attached to the polarizer, it can be used as a separator directly, which is also suitable.

將2片偏光板經由接著劑或黏著劑而積層之前，事先於欲貼合之偏光膜面及保護膜面或黏著劑面進行電暈處理、電漿處理等亦為有用。 Before laminating two polarizing plates through an adhesive or an adhesive, it is also useful to perform corona treatment and plasma treatment on the polarizing film surface and the protective film surface or the adhesive surface to be bonded in advance.

[黏著劑層14] [Adhesive layer 14]

於第2保護膜12B之與第2偏光膜11B之貼合面為相反側之面形成之黏著劑層14，只要係光學透明性優異且包含適度的濕潤性、凝集性、接著性等之黏著特性優異者即可，但較佳係使用進一步地耐久性等亦優異者。具體而言，形成黏著劑層之黏著劑，較佳可使用含有丙烯酸系樹脂之黏著劑(丙烯酸系黏著劑)。具體而言，可使用與前述黏著劑13相同者。 The adhesive layer 14 formed on the surface of the second protective film 12B that is opposite to the bonding surface of the second polarizing film 11B, as long as it is excellent in optical transparency and includes moderate wettability, cohesiveness, adhesion, etc. Those having excellent characteristics may be sufficient, but those having further excellent durability and the like are preferred. Specifically, for the adhesive forming the adhesive layer, an adhesive containing an acrylic resin (acrylic adhesive) can be preferably used. Specifically, the same as the aforementioned adhesive 13 can be used.

黏著劑層14與黏著劑層13同樣地可含有各種添加劑。其中，黏著劑層14較佳係含有抗靜電劑。一般而言，在將偏光板經由黏著劑層貼合於液晶單元時，係將直到貼合前都覆蓋並將黏著劑層暫時保護之表面保護膜(隔片)剝除後，貼合於液晶單元，但因將該表面保護膜剝 除時所產生之靜電，而產生液晶單元內之液晶之配向不良，此現象有時會導致液晶顯示裝置之顯示不良。就減少或防止此種靜電之產生之手段而言，以於黏著劑調配抗靜電劑為有效。 The adhesive layer 14 may contain various additives in the same manner as the adhesive layer 13. Among them, the adhesive layer 14 preferably contains an antistatic agent. Generally speaking, when the polarizing plate is bonded to the liquid crystal cell via the adhesive layer, the surface protective film (separator) that covers and temporarily protects the adhesive layer before peeling is peeled off and then bonded to the liquid crystal Unit, but due to the peeling of the surface protection film The static electricity generated during the time division causes the alignment of the liquid crystal in the liquid crystal cell to be poor. This phenomenon sometimes leads to poor display of the liquid crystal display device. In terms of reducing or preventing the generation of such static electricity, it is effective to formulate antistatic agents in the adhesive.

將第2保護膜12B與黏著劑層14貼合時，對欲將第2保護膜12B與黏著劑層14貼合之面，分別進行電暈處理、電漿處理等亦為有用。 When the second protective film 12B and the adhesive layer 14 are bonded, it is also useful to perform corona treatment, plasma treatment, etc., respectively on the surface where the second protective film 12B and the adhesive layer 14 are to be bonded.

[複合偏光板之製造方法] [Manufacturing method of composite polarizer]

就製造本發明之複合偏光板之方法而言，無特別限制，例如製造由第1保護膜12A與第1偏光膜11A積層而成之第1偏光板A、以及由第2保護膜12B與第2偏光膜11B積層而成之第2偏光板B。然後，於第1偏光板A或第2偏光板B之偏光膜上形成黏著劑層13。若將如此製作之第1偏光板A及第2偏光板B經由黏著劑層13且以輥對輥(roll to roll)來貼合，則得到複合偏光板10。再者，此時，第1偏光膜11A與第2偏光膜11B係經由黏著劑層或接著劑層而直接貼合。進一步將黏著劑層14形成於第2保護膜12B上而得到附有黏著劑之複合偏光板。附有黏著劑之複合偏光板可經由黏著劑14而貼合於液晶單元。 The method of manufacturing the composite polarizing plate of the present invention is not particularly limited. For example, the first polarizing plate A formed by laminating the first protective film 12A and the first polarizing film 11A, and the second protective film 12B and the second polarizing film are manufactured. 2 The second polarizing plate B formed by laminating the polarizing films 11B. Then, an adhesive layer 13 is formed on the polarizing film of the first polarizing plate A or the second polarizing plate B. If the first polarizing plate A and the second polarizing plate B produced in this way are bonded via a roll to roll through the adhesive layer 13, a composite polarizing plate 10 is obtained. Furthermore, at this time, the first polarizing film 11A and the second polarizing film 11B are directly bonded via an adhesive layer or an adhesive layer. Further, the adhesive layer 14 is formed on the second protective film 12B to obtain a composite polarizing plate with an adhesive. The composite polarizer with an adhesive can be attached to the liquid crystal cell via the adhesive 14.

又，就製造本發明之複合偏光板之方法而言，例如，製造由第1保護膜12A、第1偏光膜11A及第3保護膜15積層而成之第1偏光板A’，以及由第2保護膜12B與第2偏光膜11B積層而成之第2偏光板B’。然 後，於第1偏光板A’之第3保護膜15上或第2偏光板B’之偏光膜上形成黏著劑層13。若將如此製作之第1偏光板A’及第2偏光板B’經由黏著劑13且以輥對輥來貼合，則得到複合偏光板10。進一步將黏著劑層14形成於第2保護膜12B上而得到附有黏著劑之複合偏光板。附有黏著劑之複合偏光板可經由黏著劑層14而貼合於液晶單元。 In addition, as for the method of manufacturing the composite polarizing plate of the present invention, for example, the first polarizing plate A′ formed by laminating the first protective film 12A, the first polarizing film 11A, and the third protective film 15 and the first polarizing plate A′ 2 A second polarizing plate B'formed by stacking a protective film 12B and a second polarizing film 11B. Ran After that, an adhesive layer 13 is formed on the third protective film 15 of the first polarizing plate A'or the polarizing film of the second polarizing plate B'. If the first polarizing plate A'and the second polarizing plate B'produced in this way are bonded by roller-to-roll via the adhesive 13, a composite polarizing plate 10 is obtained. Further, the adhesive layer 14 is formed on the second protective film 12B to obtain a composite polarizing plate with an adhesive. The composite polarizer with an adhesive can be attached to the liquid crystal cell via the adhesive layer 14.

又，將前述第1偏光板A(或A’)及第2偏光板B(或B’)藉由無溶劑型接著劑且以輥對輥貼合而製作複合偏光板10之方法，係亦適合使用。 In addition, the method of manufacturing the composite polarizing plate 10 by combining the first polarizing plate A (or A') and the second polarizing plate B (or B') with a solvent-free adhesive and using roll-to-roll bonding is also Suitable for use.

如上述將2個偏光板積層而製造複合偏光板時，第1偏光板之單體穿透率較佳係38.0至43.0%，更佳係40.0至42.5%。第2偏光板之單體穿透率較佳係40.0至45.0%，更佳係41.0至43.0%。又，第1偏光板之偏光度及第2偏光板之偏光度皆較佳係99.90%以上，更佳係99.95%以上。 As described above, when two polarizing plates are laminated to manufacture a composite polarizing plate, the monomer transmittance of the first polarizing plate is preferably 38.0 to 43.0%, and more preferably 40.0 to 42.5%. The monomer transmittance of the second polarizing plate is preferably 40.0 to 45.0%, more preferably 41.0 to 43.0%. In addition, the polarization degree of the first polarizing plate and the polarization degree of the second polarizing plate are preferably 99.90% or more, more preferably 99.95% or more.

如此，本發明之複合偏光板中，較佳係第2偏光板之單體穿透率大於第1偏光板之單體穿透率。第1偏光板之單體穿透率與第2偏光板之單體穿透率之差，較佳係0.1%以上，更佳係超過0.2%，亦可為0.4%以上。差之上限雖無特別限制，但通常係5%以下，較佳係2%以下，更佳係1%以下。 In this way, in the composite polarizing plate of the present invention, it is preferable that the second polarizing plate has a monomer transmittance greater than that of the first polarizing plate. The difference between the monomer transmittance of the first polarizer and the monomer polarizer of the second polarizer is preferably 0.1% or more, more preferably more than 0.2%, or 0.4% or more. Although the upper limit of the difference is not particularly limited, it is usually 5% or less, preferably 2% or less, and more preferably 1% or less.

又，將構成複合偏光板10之全部的膜使用水系接著劑或無溶劑型接著劑以1次積層，係為生產效率佳而適合使用。 In addition, all the films constituting the composite polarizing plate 10 are laminated in one order using an aqueous adhesive or a solventless adhesive, which is suitable for good production efficiency.

藉由上述製造方法所得之複合偏光板之偏光度較佳係99.95%以上，更佳係99.99%以上，再更佳係99.995%以上。又，本發明之複合偏光板即使在投入95℃之烘箱1000小時之耐熱試驗後，仍抑制偏光度之降低。例如，就前述耐熱試驗後之複合偏光板之偏光度而言，可為99.95%以上，亦可為99.99%以上。從別的觀點來看，前述耐熱試驗前後之偏光度降低程度之大小，在本發明之複合偏光板中，可為0.010%以下，較佳係可為0.005%以下，更佳係可為0.003%以下。 The polarization degree of the composite polarizing plate obtained by the above manufacturing method is preferably 99.95% or more, more preferably 99.99% or more, and even more preferably 99.995% or more. In addition, the composite polarizing plate of the present invention suppresses the decrease in the degree of polarization even after being put into a 95°C oven for 1000 hours of heat resistance test. For example, the polarization degree of the composite polarizer after the aforementioned heat resistance test may be 99.95% or more, or 99.99% or more. From another point of view, the degree of reduction in the degree of polarization before and after the heat resistance test can be 0.010% or less in the composite polarizer of the present invention, preferably 0.005% or less, and more preferably 0.003% the following.

[液晶單元] [LCD unit]

液晶單元具有2片單元基板(cell substrate)、與夾在該等基板間之液晶層。單元基板一般大多以玻璃構成，但亦可為塑膠基板。此外，本發明之液晶面板所用之液晶單元本身可由其領域所採用之各種物件而構成。 The liquid crystal cell has two cell substrates and a liquid crystal layer sandwiched between the substrates. The unit substrate is generally composed of glass, but it may also be a plastic substrate. In addition, the liquid crystal cell used in the liquid crystal panel of the present invention can be composed of various objects used in its field.

[液晶面板] [LCD panel]

可藉由將複合偏光板10經由黏著劑層14貼合於液晶單元，而製作液晶面板。通常，偏光板係貼合於液晶單元之雙面，但本發明之複合偏光板適合使用於液晶顯示裝置之視認側及背面側或其雙面。 The liquid crystal panel can be manufactured by bonding the composite polarizer 10 to the liquid crystal cell through the adhesive layer 14. Generally, the polarizing plate is attached to both sides of the liquid crystal cell, but the composite polarizing plate of the present invention is suitable for use on the viewing side and the back side of the liquid crystal display device or both sides thereof.

(實施例) (Example)

以下，列示實施例進一步具體地說明本發明，但本發明不限於該等例子。例中，表示含量或使用量 之「份」及「%」，在無特別註記時，係重量基準。再者，以下例子中之各物性之測定係依據下述方法進行。 In the following, the examples are listed to further specifically explain the present invention, but the present invention is not limited to these examples. In the example, it indicates the content or amount used The "parts" and "%" are the basis of weight when there is no special note. In addition, the measurement of each physical property in the following example is performed according to the following method.

(1)厚度之測定： (1) Determination of thickness:

使用Nikon股份有限公司製之數位測微計“MH-15M”來測定。 It was measured using a digital micrometer "MH-15M" made by Nikon Corporation.

(2)面內相位差值及厚度方向之相位差值之測定： (2) Measurement of in-plane phase difference and thickness phase difference:

使用王子計測機器股份有限公司製之以平行偏光旋轉法為原理之相位差計“KOBRA(註冊商標)-WPR”，在23℃之溫度，測定在波長590nm之面內相位差值及厚度方向之相位差值。 Using the phase difference meter "KOBRA (registered trademark)-WPR" based on the principle of the parallel polarization rotation method manufactured by Oji Measuring Equipment Co., Ltd., the in-plane phase difference value and the thickness direction at a wavelength of 590 nm are measured at a temperature of 23°C Phase difference value.

(3)偏光膜之收縮力之測定： (3) Determination of shrinkage force of polarizing film:

使用荻野精機製作所股份有限公司製之Super Cutter並以使偏光膜之吸收軸方向成為長軸之方式裁切為寬度2mm×長度50mm之片段。將所得之短條狀偏光膜作為收縮力測定試樣。於熱機械分析裝置[日立High-Tech Science股份有限公司製之“TMA/6100”]以使夾頭(chuck)間距離為10mm之方式設置收縮力測定試樣，將試驗片在20℃之室內放置充分的時間後，將試樣之室內溫度於1分鐘從20℃昇溫至80℃，並將昇溫後試樣室內溫度設定為維持在80℃。昇溫後放置4小時之後，在80℃之環境下對測定試樣之長邊方向之收縮力進行測定。該測定中，靜負載設為 0mN，治具使用SUS製之探針(probe)。 Using Super Cutter manufactured by Ogino Seiki Co., Ltd., and cutting the polarizing film so that the absorption axis direction becomes the long axis, it is cut into fragments of 2 mm in width×50 mm in length. The obtained short strip-shaped polarizing film was used as a shrinkage force measurement sample. A thermomechanical analyzer ["TMA/6100" manufactured by Hitachi High-Tech Science Co., Ltd.] was used to set the shrinkage force measurement sample so that the distance between the chucks was 10 mm, and the test piece was placed in a 20°C room After leaving for a sufficient time, the temperature of the sample chamber was increased from 20°C to 80°C in 1 minute, and the temperature of the sample chamber was set to be maintained at 80°C after the temperature was raised. After the temperature was raised and left for 4 hours, the shrinkage force in the longitudinal direction of the measurement sample was measured in an environment of 80°C. In this measurement, the static load is 0mN, the SUS probe is used for the jig.

(4)偏光板之偏光度及單體穿透率之測定： (4) Determination of the polarization degree of the polarizing plate and the penetration rate of the monomer:

使用附積分球之分光光度計[日本分光股份有限公司製之「V7100」，2度視野；C光源]進行測定。 A spectrophotometer with an integrating sphere ["V7100" manufactured by Japan Spectroscopy Co., Ltd., 2 degree field of view; C light source] was used for measurement.

[製造例1]偏光膜1之製作 [Manufacture example 1] Production of polarizing film 1

將厚度20μm之聚乙烯醇膜(平均聚合度約2400，皂化度99.9莫耳%以上)以乾式延伸而一軸延伸為約4倍，進一步在保持緊張狀態下，於40℃純水中浸漬40秒後，於碘/碘化鉀/水之重量比為0.052/5.7/100之水溶液中以28℃浸漬30秒而進行染色處理。然後，於碘化鉀/硼酸/水之重量比為11.0/6.2/100之水溶液中以70℃浸漬120秒。繼而，以8℃純水洗淨15秒後，在以300N張力保持之狀態下，以60℃乾燥50秒然後以75℃乾燥20秒，得到於聚乙烯醇膜吸附配向有碘之厚度7μm之吸收型偏光膜。測定所得之偏光膜之收縮力，結果為1.7N。 A polyvinyl alcohol film with a thickness of 20 μm (average degree of polymerization of about 2400 and saponification degree of 99.9 mol% or more) is dry-extended and uniaxially stretched to about 4 times, and further immersed in 40°C pure water for 40 seconds while maintaining tension After that, it was immersed in an aqueous solution having a weight ratio of iodine/potassium iodide/water of 0.052/5.7/100 at 28°C for 30 seconds to perform dyeing treatment. Then, it was immersed in an aqueous solution having a weight ratio of potassium iodide/boric acid/water of 11.0/6.2/100 at 70°C for 120 seconds. Then, after washing with 8°C pure water for 15 seconds, it was dried at 60°C for 50 seconds and then at 75°C for 20 seconds while maintaining the tension of 300N. The thickness of the iodine adsorbed on the polyvinyl alcohol film was 7 μm. Absorption polarizing film. The shrinkage force of the obtained polarizing film was measured and found to be 1.7N.

[製造例2]偏光膜2之製作 [Manufacture example 2] Production of polarizing film 2

將厚度30μm之聚乙烯醇膜(平均聚合度約2400，皂化度99.9莫耳%以上)以乾式延伸而一軸延伸約4倍，進一步在保持緊張狀態下，於40℃純水中浸漬40秒後，於碘/碘化鉀/水之重量比為0.052/5.7/100之水溶液中以28℃浸漬30秒而進行染色處理。然後，於碘化鉀/硼酸/水之重量 比為11.0/6.2/100之水溶液中以70℃浸漬120秒。繼而，以8℃純水洗淨15秒後，在以300N張力保持之狀態下，以60℃乾燥50秒然後以75℃乾燥20秒，得到於聚乙烯醇膜吸附配向有碘之厚度12μm之吸收型偏光膜。測定所得之偏光膜之收縮力，結果為2.0N。 A polyvinyl alcohol film with a thickness of 30 μm (average degree of polymerization of about 2400 and saponification degree of 99.9 mol% or more) is stretched dry and uniaxially stretched by about 4 times, and further immersed in 40°C pure water for 40 seconds while maintaining tension ，Immersion in an aqueous solution with a weight ratio of iodine/potassium iodide/water of 0.052/5.7/100 at 28℃ for 30 seconds for dyeing treatment. Then, the weight of potassium iodide/boric acid/water The aqueous solution having a ratio of 11.0/6.2/100 was immersed at 70°C for 120 seconds. Then, after washing with 8°C pure water for 15 seconds, it was dried at 60°C for 50 seconds and then at 75°C for 20 seconds while maintaining the tension of 300N, to obtain a thickness of 12 μm with iodine adsorbed on the polyvinyl alcohol film. Absorption polarizing film. The shrinkage force of the obtained polarizing film was measured and found to be 2.0N.

[製造例3]偏光膜3之製作 [Manufacture example 3] Production of polarizing film 3

將平均聚合度1100且皂化度99.5莫耳%之乙醯乙醯基改質聚乙烯醇粉末[日本合成化學工業股份有限公司製之商品名「GOHSEFIMER(註冊商標)Z-200」]溶解於95℃熱水，調製3%濃度之水溶液。於此水溶液中，相對於聚乙烯醇之固形分6份，以5份之比例混合作為交聯劑之水溶性聚醯胺環氧樹脂[田岡化學工業股份有限公司製之商品名「Sumirez Resin(註冊商標)650」，固形分濃度30%之水溶液]，作成底塗用塗佈液。然後，對基材膜(厚度110μm，熔點163℃之聚丙烯膜)施以電暈處理後，將底塗用塗佈液使用微凹版塗佈機塗佈於於其電暈處理面。然後，以80℃乾燥10分鐘，形成厚度0.2μm之底塗層。 Dissolve acetoacetylate modified polyvinyl alcohol powder with an average polymerization degree of 1100 and a saponification degree of 99.5 mol% [trade name "GOHSEFIMER (registered trademark) Z-200" manufactured by Nippon Synthetic Chemical Industry Co., Ltd.] in 95 ℃ hot water, prepare 3% strength aqueous solution. In this aqueous solution, a water-soluble polyamide epoxy resin [trade name "Sumirez Resin (manufactured by Taoka Chemical Industry Co., Ltd. made by Taoka Chemical Industry Co., Ltd.) is mixed as a cross-linking agent at a ratio of 5 parts relative to the solid content of polyvinyl alcohol in 6 parts. Registered trademark) 650", an aqueous solution with a solid concentration of 30%], used as a coating liquid for undercoating. Then, after corona treatment was applied to the base film (polypropylene film having a thickness of 110 μm and a melting point of 163° C.), the coating liquid for undercoating was applied to the corona treatment surface using a microgravure coater. Then, it was dried at 80°C for 10 minutes to form an undercoat layer with a thickness of 0.2 μm.

然後，將平均聚合度2400且皂化度98.0至99.0莫耳%之聚乙烯醇粉末[由KURARAY股份有限公司取得之商品名「PVA124」]溶解於95℃熱水，調製8%濃度之聚乙烯醇水溶液。將所得之水溶液使用唇式塗佈機於室溫塗佈於上述基材膜之底塗層上，以80℃乾燥20分鐘，製作由基材膜/底塗層/聚乙烯醇層所成之積層膜。 Then, a polyvinyl alcohol powder with an average polymerization degree of 2400 and a saponification degree of 98.0 to 99.0 mol% [trade name "PVA124" obtained from KURARAY Co., Ltd.] was dissolved in hot water at 95°C to prepare an 8% concentration polyvinyl alcohol Water solution. The obtained aqueous solution was applied to the undercoat layer of the above-mentioned base film using a lip coater at room temperature, and dried at 80°C for 20 minutes to prepare the base film/undercoat layer/polyvinyl alcohol layer. Laminated film.

其次，將所得之積層膜，於溫度160℃以自由端縱向一軸延伸為5.8倍。如此所得之積層延伸膜之整體厚度係28.5μm，聚乙烯醇層之厚度係5.0μm。 Next, the obtained laminated film was extended at a temperature of 160° C. with a free end longitudinal axis extending 5.8 times. The overall thickness of the laminated stretched film thus obtained was 28.5 μm, and the thickness of the polyvinyl alcohol layer was 5.0 μm.

將所得之積層延伸膜於水/碘/碘化鉀之重量比為100/0.35/10之水溶液中以26℃浸漬90秒而染色後，以10℃純水洗淨。然後，將該積層延伸膜於水/硼酸/碘化鉀之重量比為100/9.5/5之水溶液中以76℃浸漬300秒，使聚乙烯醇交聯。繼而，以10℃純水洗淨10秒，最後於80℃進行200秒之乾燥處理。藉由以上操作，製作在聚丙烯基材膜上形成有由吸附配向有碘之聚乙烯醇層所成之厚度5μm之偏光膜3的偏光性積層膜。將所得之偏光膜從基材剝離並測定收縮力，結果為1.45N。 The obtained laminated stretched film was immersed in an aqueous solution having a water/iodine/potassium iodide weight ratio of 100/0.35/10 at 26°C for 90 seconds for dyeing, and then washed with pure water at 10°C. Then, the laminated stretched film was immersed in an aqueous solution having a water/boric acid/potassium iodide weight ratio of 100/9.5/5 at 76°C for 300 seconds to crosslink polyvinyl alcohol. Then, it was washed with pure water at 10°C for 10 seconds, and finally dried at 80°C for 200 seconds. Through the above operation, a polarizing laminate film in which a polarizing film 3 having a thickness of 5 μm formed by a polyvinyl alcohol layer having iodine adsorbed and aligned on the polypropylene base film is produced. The obtained polarizing film was peeled from the substrate and the shrinkage force was measured. The result was 1.45N.

[製造例4]偏光膜4之製作 [Manufacture example 4] Production of polarizing film 4

將厚度60μm之聚乙烯醇膜(平均聚合度約2400，皂化度99.9莫耳%以上)以乾式延伸而一軸延伸為約4倍，進一步在保持緊張狀態下，於40℃純水中浸漬40秒後，於碘/碘化鉀/水之重量比為0.052/5.7/100之水溶液中以28℃浸漬30秒而進行染色處理。然後，於碘化鉀/硼酸/水之重量比為11.0/6.2/100之水溶液中以70℃浸漬120秒。繼而，以8℃純水洗淨15秒後，在以300N張力保持之狀態下，以60℃乾燥50秒然後以75℃乾燥20秒，得到於聚乙烯醇膜吸附配向有碘之厚度23μm之吸收型偏光子。測定所得之偏光膜之收縮力，結果為3.1N。 A polyvinyl alcohol film with a thickness of 60 μm (average degree of polymerization of about 2400, saponification degree of 99.9 mol% or more) is dry-stretched and uniaxially stretched to about 4 times, and further immersed in 40°C pure water for 40 seconds while maintaining tension After that, it was immersed in an aqueous solution having a weight ratio of iodine/potassium iodide/water of 0.052/5.7/100 at 28°C for 30 seconds to perform dyeing treatment. Then, it was immersed in an aqueous solution having a weight ratio of potassium iodide/boric acid/water of 11.0/6.2/100 at 70°C for 120 seconds. Then, after washing with pure water at 8°C for 15 seconds, it was dried at 60°C for 50 seconds and then at 75°C for 20 seconds while maintaining the tension of 300N. The thickness of the iodine adsorbed on the polyvinyl alcohol film was 23 μm. Absorption polarizer. The shrinkage force of the obtained polarizing film was measured and found to be 3.1N.

[製造例5]水系接著劑之製作 [Production Example 5] Preparation of water-based adhesive

相對於水100重量份，溶解3重量份之羧基改質聚乙烯醇[由KURARAY股份有限公司取得之商品名「KL-318」]，並於該水溶液中添加1.5重量份之屬於水溶性環氧樹脂之聚醯胺環氧系添加劑[由田岡化學工業股份有限公司取得之商品名「Sumirez Resin(註冊商標)650(30)」，固形分濃度30重量%之水溶液]，調製水系接著劑。 Dissolve 3 parts by weight of carboxy-modified polyvinyl alcohol [trade name "KL-318" obtained from KURARAY Co., Ltd.] with respect to 100 parts by weight of water, and add 1.5 parts by weight of water-soluble epoxy to the aqueous solution Polyamide epoxy-based additives for resins [trade name "Sumirez Resin (registered trademark) 650(30)", an aqueous solution with a solid content concentration of 30% by weight obtained from Tiangang Chemical Industry Co., Ltd.], to prepare an aqueous adhesive.

[製造例6]包含硬化性環氧系樹脂組成物之接著劑之製作 [Production Example 6] Preparation of adhesive containing curable epoxy resin composition

將作為屬於脂環式環氧系樹脂之相當於上述式D之二羧酸之環氧基環己基甲酯類的己二酸雙(3,4-環氧基環己基甲基)酯100份、作為氫化環氧系樹脂之氫化雙酚A之二環氧丙基醚25份、及作為光陽離子聚合起始劑之4,4’-雙(二苯基二氫硫基)二苯基硫醚 雙(六氟磷酸鹽)2.2份混合後，進行脫泡，得到包含硬化性環氧系樹脂組成物之接著劑A。再者，光陽離子聚合起始劑係以50質量%碳酸丙烯酯溶液之形式調配。 100 parts of bis(3,4-epoxycyclohexylmethyl) adipate, which is an epoxycyclohexyl methyl ester corresponding to the dicarboxylic acid of the above formula D, which is an alicyclic epoxy resin , 25 parts of diglycidyl ether of hydrogenated bisphenol A as hydrogenated epoxy resin, and 4,4'-bis(diphenyldihydrothio)diphenylsulfide as photo-cationic polymerization initiator After 2.2 parts of ether bis(hexafluorophosphate) were mixed, defoaming was performed to obtain an adhesive A containing a curable epoxy resin composition. Furthermore, the photo-cationic polymerization initiator is formulated in the form of a 50% by mass propylene carbonate solution.

[黏著劑A、B] [Adhesives A, B]

準備以下2種黏著劑。 Prepare the following 2 adhesives.

黏著劑A：厚度25μm之片(sheet)狀黏著劑[Lintec股份有限公司製之「P-3132」] Adhesive A: A sheet-shaped adhesive with a thickness of 25 μm ["P-3132" manufactured by Lintec Corporation]

黏著劑B：厚度15μm之片狀黏著劑[Lintec股份有限公司製之「P-0082」] Adhesive B: Sheet adhesive with a thickness of 15 μm ["P-0082" manufactured by Lintec Corporation]

[保護膜A、B、C] [Protection film A, B, C]

準備以下3種保護膜。 Prepare the following 3 types of protective film.

保護膜A：KONICA MINOLTA股份有限公司製之附有硬塗層之三乙醯纖維素膜；25KCHCN-TC(厚度32μm) Protective film A: Triacetyl cellulose film with hard coating made by KONICA MINOLTA Co., Ltd.; 25KCHCN-TC (thickness 32μm)

保護膜B：KONICA MINOLTA股份有限公司製之三乙醯纖維素膜；KC2CT(厚度20μm、在波長590nm之面內相位差值=1.2nm、在波長590nm之厚度方向相位差=1.3nm) Protective film B: Triacetyl cellulose film manufactured by KONICA MINOLTA Co., Ltd.; KC2CT (thickness 20 μm, phase difference in the plane of wavelength 590 nm = 1.2 nm, phase difference in the thickness direction of wavelength 590 nm = 1.3 nm)

保護膜C：日本Zeon股份有限公司製之環狀聚烯烴系樹脂膜；ZF14-013(厚度13μm、在波長590nm之面內相位差值=0.8nm、在波長590nm之厚度方向相位差=3.4nm) Protective film C: cyclic polyolefin resin film made by Zeon Co., Ltd., Japan; ZF14-013 (thickness 13 μm, in-plane retardation value at a wavelength of 590 nm = 0.8 nm, and thickness direction retardation at a wavelength of 590 nm = 3.4 nm )

[製造例7] [Production Example 7]

(偏光板A-1之製作) (Production of polarizer A-1)

對保護膜A進行皂化處理。以使保護膜A之三乙醯纖維素面成為與偏光膜1之貼合面之方式，將保護膜A與偏光膜1以水系接著劑接著，得到偏光板A-1。偏光板A-1之單體穿透率為42.0%。 Saponification treatment is performed on the protective film A. The polarizing plate A-1 was obtained by bonding the protective film A and the polarizing film 1 with an aqueous adhesive so that the triacetyl cellulose surface of the protective film A became the bonding surface with the polarizing film 1. The monomer penetration rate of polarizing plate A-1 was 42.0%.

[製造例8] [Production Example 8]

(偏光板B-1之製作) (Production of polarizer B-1)

對保護膜B進行皂化處理。以使保護膜B之三乙醯纖 維素面成為與偏光膜1之貼合面之方式，將保護膜B與偏光膜1以水系接著劑接著，得到偏光板B-1。偏光板B-1之單體穿透率為42.5%。 Saponification treatment is performed on the protective film B. In order to make the protective film B of triacetyl The voxel surface becomes a bonding surface with the polarizing film 1, and the protective film B and the polarizing film 1 are bonded with an aqueous adhesive to obtain a polarizing plate B-1. The monomer transmittance of polarizing plate B-1 was 42.5%.

[製造例9] [Production Example 9]

(偏光板C-1之製作) (Production of polarizer C-1)

對保護膜C之一側之表面施以電暈處理。以使保護膜C之施有電暈處理之面成為與偏光膜1之貼合面之方式，將保護膜C與偏光膜1以水系接著劑接著，得到偏光板C-1。偏光板C-1之單體穿透率為42.3%。 The surface of one side of the protective film C is subjected to corona treatment. The protective film C and the polarizing film 1 were bonded with an aqueous adhesive so that the corona-treated surface of the protective film C became the bonding surface with the polarizing film 1 to obtain a polarizing plate C-1. The monomer penetration rate of the polarizing plate C-1 was 42.3%.

[製造例10] [Production Example 10]

(偏光板D-1之製作) (Production of polarizer D-1)

對保護膜A進行皂化處理。以使保護膜A之三乙醯纖維素面成為與偏光膜2之貼合面之方式，將保護膜A與偏光膜2以水系接著劑接著，得到偏光板D-1。偏光板D-1之單體穿透率為42.0%。 Saponification treatment is performed on the protective film A. The polarizing plate D-1 was obtained by bonding the protective film A and the polarizing film 2 with an aqueous adhesive so that the triacetyl cellulose surface of the protective film A became the bonding surface with the polarizing film 2. The monomer penetration rate of polarizing plate D-1 was 42.0%.

[製造例11] [Production Example 11]

(偏光板E-1之製作) (Production of polarizer E-1)

對保護膜B進行皂化處理。以使保護膜B之三乙醯纖維素面成為與偏光膜2之貼合面之方式，將保護膜B與偏光膜2以水系接著劑接著，得到偏光板E-1。偏光板E-1之單體穿透率為42.5%。 Saponification treatment is performed on the protective film B. The polarizing plate E-1 was obtained by bonding the protective film B and the polarizing film 2 with an aqueous adhesive so that the triacetyl cellulose surface of the protective film B became the bonding surface with the polarizing film 2. The monomer transmittance of polarizing plate E-1 was 42.5%.

[製造例12] [Production Example 12]

(偏光板F-1之製作) (Production of polarizer F-1)

對保護膜C之一側之表面進行電暈處理。以使保護膜C之施有電暈處理之面成為與偏光膜2之貼合面之方式，將保護膜C與偏光膜2以水系接著劑接著，得到偏光板F-1。偏光板F-1之單體穿透率為42.3%。 The surface of one side of the protective film C is subjected to corona treatment. The protective film C and the polarizing film 2 were bonded with an aqueous adhesive so that the corona-treated surface of the protective film C became the bonding surface with the polarizing film 2 to obtain a polarizing plate F-1. The monomer transmittance of polarizing plate F-1 was 42.3%.

[製造例13] [Production Example 13]

(偏光板G-1之製作) (Production of polarizer G-1)

對保護膜A進行皂化處理，對保護膜C之一側之表面進行電暈處理。以使保護膜A之三乙醯纖維素面、偏光膜2、保護膜C之施有電暈處理之面成為貼合面之方式將3片膜以水系接著劑貼合，得到偏光板G-1。偏光板G-1之單體穿透率為42.3%。 Saponification treatment is performed on the protective film A, and corona treatment is performed on the surface on one side of the protective film C. Three sheets of film were bonded with an aqueous adhesive so that the triacetyl cellulose surface of the protective film A, the polarizing film 2, and the corona-treated surfaces of the protective film C became the bonding surface to obtain the polarizing plate G-1 . The monomer penetration rate of polarizing plate G-1 was 42.3%.

[製造例14] [Production Example 14]

(偏光板H-1之製作) (Production of polarizing plate H-1)

對保護膜A進行皂化處理。以使保護膜A之三乙醯纖維素面成為貼合面之方式，將保護膜A以水系接著劑貼合於形成有偏光膜3之製造例3所製作之偏光性積層膜之與基材膜為相反側之面(偏光膜面)，僅將基材膜剝離而得到偏光板H-1。偏光板H-1之單體穿透率為41.2%。 Saponification treatment is performed on the protective film A. The protective film A was bonded to the polarizing laminate film produced in Production Example 3 with the polarizing film 3 and the base film in such a manner that the triacetyl cellulose surface of the protective film A became the bonding surface. It is the surface on the opposite side (polarizing film surface), and only the base film is peeled off to obtain polarizing plate H-1. The monomer penetration rate of polarizing plate H-1 was 41.2%.

[製造例15至22] [Production Examples 15 to 22]

除了將製造例7至14所用之水系接著劑變更為上述包含硬化性環氧系樹脂組成物之接著劑以外，以同樣方式製作偏光板I-1至偏光板P-1。貼合時，使用附有帶式運送機之紫外線照射裝置(燈：Fusion D燈、積算光量1500mJ/cm²)進行紫外線照射，於室溫放置1小時而進行。 The polarizing plate I-1 to the polarizing plate P-1 were produced in the same manner except that the aqueous adhesive used in Production Examples 7 to 14 was changed to the adhesive containing the curable epoxy resin composition described above. At the time of bonding, an ultraviolet irradiation device (lamp: Fusion D lamp, integrated light amount 1500 mJ/cm ² ) with a belt conveyor was used to irradiate the ultraviolet rays, and left at room temperature for 1 hour.

所製造之偏光板之單體穿透率分別為下述者。 The individual transmittances of the manufactured polarizing plates are as follows.

再者，()內表示相同構成之以水系接著劑所製作之偏光板。 In addition, () shows the polarizing plate made with the water-based adhesive of the same structure.

製造例15 偏光板I-1(偏光板A-1)：單體穿透率為42.0% Production Example 15 Polarizing plate I-1 (polarizing plate A-1): monomer transmittance is 42.0%

製造例16 偏光板J-1(偏光板B-1)：單體穿透率為42.5% Production Example 16 Polarizing plate J-1 (polarizing plate B-1): monomer transmittance is 42.5%

製造例17 偏光板K-1(偏光板C-1)：單體穿透率為42.3% Production Example 17 Polarizing Plate K-1 (Polarizing Plate C-1): Monomer transmittance is 42.3%

製造例18 偏光板L-1(偏光板D-1)：單體穿透率為42.0% Production Example 18 Polarizing plate L-1 (polarizing plate D-1): monomer transmittance is 42.0%

製造例19 偏光板M-1(偏光板E-1)：單體穿透率為42.5% Production Example 19 Polarizing plate M-1 (polarizing plate E-1): monomer transmittance is 42.5%

製造例20 偏光板N-1(偏光板F-1)：單體穿透率為42.3% Production Example 20 Polarizing Plate N-1 (Polarizing Plate F-1): Monomer transmittance is 42.3%

製造例21 偏光板O-1(偏光板G-1)：單體穿透率為42.3% Production Example 21 Polarizing plate O-1 (polarizing plate G-1): monomer transmittance is 42.3%

製造例22 偏光板P-1(偏光板H-1)：單體穿透率為41.2% Production Example 22 Polarizing plate P-1 (polarizing plate H-1): monomer transmittance is 41.2%

[製造例23] [Production Example 23]

(偏光板Q-1之製作) (Production of polarizer Q-1)

除了將偏光板A-1中之偏光膜1變更為偏光膜4以外，以同樣方式製作偏光板。偏光板Q-1之單體穿透率為42.0%。 A polarizing plate was produced in the same manner except that the polarizing film 1 in the polarizing plate A-1 was changed to the polarizing film 4. The monomer penetration rate of the polarizing plate Q-1 was 42.0%.

[製造例24] [Production Example 24]

(偏光板R-1之製作) (Production of polarizer R-1)

除了將偏光板B-1中之偏光膜1變更為偏光膜4以外，以同樣方式製作偏光板。偏光板R之單體穿透率為42.5%。 A polarizing plate was produced in the same manner except that the polarizing film 1 in the polarizing plate B-1 was changed to the polarizing film 4. The monomer penetration rate of the polarizing plate R is 42.5%.

[製造例25] [Production Example 25]

(偏光板A-2之製作) (Production of polarizer A-2)

對保護膜A與保護膜B進行皂化處理。以使保護膜A之三乙醯纖維素面及保護膜B之三乙醯纖維素面成為與偏光膜1之貼合面之方式，將保護膜A與偏光膜1與保護膜B以水系接著劑接著，得到偏光板A-2。偏光板A-2之單體穿透率為42.0%。 Saponification treatment is performed on the protective film A and the protective film B. The protective film A and the polarizing film 1 and the protective film B are adhered with an aqueous adhesive so that the triacetyl cellulose surface of the protective film A and the triacetyl cellulose surface of the protective film B become the bonding surface with the polarizing film 1 To obtain polarizing plate A-2. The monomer penetration rate of polarizing plate A-2 was 42.0%.

[製造例26] [Production Example 26]

(偏光板B-2之製作) (Production of polarizer B-2)

對保護膜B進行皂化處理。以使保護膜B之三乙醯纖維素面成為與偏光膜1之貼合面之方式，將保護膜B與偏光膜1以水系接著劑接著，得到偏光板B-2。偏光板B-2之單體穿透率為42.5%。 Saponification treatment is performed on the protective film B. The polarizing plate B-2 was obtained by bonding the protective film B and the polarizing film 1 with an aqueous adhesive so that the triacetyl cellulose surface of the protective film B became the bonding surface with the polarizing film 1. The monomer transmittance of polarizing plate B-2 was 42.5%.

[製造例27] [Production Example 27]

(偏光板C-2之製作) (Production of polarizer C-2)

對保護膜C之一側之表面施以電暈處理。以使施有電 暈處理之面成為與偏光膜1之貼合面之方式，將保護膜C與偏光膜1以水系接著劑接著，得到偏光板C-2。偏光板C-2之單體穿透率為42.3%。 The surface of one side of the protective film C is subjected to corona treatment. So that Shi Youdian The halo-treated surface becomes a bonding surface with the polarizing film 1, and the protective film C and the polarizing film 1 are bonded with an aqueous adhesive to obtain a polarizing plate C-2. The monomer penetration rate of polarizing plate C-2 was 42.3%.

[製造例28] [Production Example 28]

(偏光板D-2之製作) (Production of polarizer D-2)

對保護膜A與保護膜B進行皂化處理。以使保護膜A之三乙醯纖維素面及保護膜B之三乙醯纖維素面成為與偏光膜2之貼合面之方式，將保護膜A與偏光膜2與保護膜B以水系接著劑接著，得到偏光板D-2。偏光板D-2之單體穿透率為42.0%。 Saponification treatment is performed on the protective film A and the protective film B. The protective film A and the polarizing film 2 and the protective film B are adhered with an aqueous adhesive in such a manner that the triacetyl cellulose surface of the protective film A and the triacetyl cellulose surface of the protective film B become the bonding surfaces with the polarizing film 2 To obtain polarizing plate D-2. The monomer penetration rate of the polarizing plate D-2 was 42.0%.

[製造例29] [Production Example 29]

(偏光板E-2之製作) (Production of polarizing plate E-2)

對保護膜B進行皂化處理。以使保護膜B之三乙醯纖維素面成為與偏光膜2之貼合面之方式，將保護膜B與偏光膜2以水系接著劑接著，得到偏光板E-2。偏光板E-2之單體穿透率為42.5%。 Saponification treatment is performed on the protective film B. The polarizing plate E-2 was obtained by bonding the protective film B and the polarizing film 2 with an aqueous adhesive so that the triacetyl cellulose surface of the protective film B became the bonding surface with the polarizing film 2. The monomer transmittance of polarizing plate E-2 was 42.5%.

[製造例30] [Production Example 30]

(偏光板F-2之製作) (Production of polarizer F-2)

對保護膜C之一側之表面施以電暈處理。以使保護膜C之施有電暈處理之面成為與偏光膜2之貼合面之方式，將保護膜C與偏光膜2以水系接著劑接著，得到偏光板 F-2。偏光板F-2之單體穿透率為42.3%。 The surface of one side of the protective film C is subjected to corona treatment. The protective film C and the polarizing film 2 are bonded with an aqueous adhesive so that the corona-treated surface of the protective film C becomes the bonding surface with the polarizing film 2 to obtain a polarizing plate F-2. The monomer penetration rate of polarizing plate F-2 was 42.3%.

[製造例31] [Production Example 31]

(偏光板G-2之製作) (Production of polarizer G-2)

對保護膜A進行皂化處理，對保護膜C之一側之表面進行電暈處理。以使保護膜A之三乙醯纖維素面及保護膜C之施有電暈處理之面成為與偏光膜2之貼合面之方式，將保護膜A與偏光膜2與保護膜C以水系接著劑貼合，得到偏光板G-2。偏光板G-2之單體穿透率為42.3%。 Saponification treatment is performed on the protective film A, and corona treatment is performed on the surface on one side of the protective film C. The protective film A, the polarized cellulose surface of the protective film A and the corona-treated surface of the protective film C become the bonding surface with the polarizing film 2, the protective film A, the polarizing film 2 and the protective film C are adhered by water The agent is bonded to obtain polarizing plate G-2. The monomer penetration rate of polarizing plate G-2 was 42.3%.

[製造例32] [Production Example 32]

(偏光板H-2之製作) (Production of polarizing plate H-2)

對保護膜A及保護膜B進行皂化處理。從製造例3所製作之偏光性積層膜僅將基材膜剝離，得到偏光膜3。將已進行皂化處理之保護膜A之三乙醯纖維素面與偏光膜3與保護膜B以水系接著劑接著，得到偏光板H-2。偏光板H-2之單體穿透率為41.2%。 Saponification treatment is performed on the protective film A and the protective film B. Only the base film was peeled from the polarizing laminate film produced in Production Example 3, and the polarizing film 3 was obtained. The triacetyl cellulose surface of the protective film A that has been saponified, the polarizing film 3 and the protective film B are adhered with an aqueous adhesive to obtain a polarizing plate H-2. The monomer penetration rate of the polarizing plate H-2 was 41.2%.

[製造例33至40] [Production Examples 33 to 40]

除了將製造例25至32所用之水系接著劑變更為包含硬化性環氧系樹脂組成物之接著劑以外，以同樣方式製作偏光板I-2至偏光板P-2。貼合時，使用附有帶式運送機之紫外線照射裝置(燈：Fusion D燈、積算光量1500mJ/cm²)進行紫外線照射，於室溫放置1小時而進行。 The polarizing plates I-2 to P-2 were produced in the same manner except that the water-based adhesive used in Production Examples 25 to 32 was changed to an adhesive containing a curable epoxy resin composition. At the time of bonding, an ultraviolet irradiation device (lamp: Fusion D lamp, integrated light amount 1500 mJ/cm ² ) with a belt conveyor was used to irradiate the ultraviolet rays, and left at room temperature for 1 hour.

所製造之偏光板之單體穿透率分別為下述者。 The individual transmittances of the manufactured polarizing plates are as follows.

再者，()內表示相同構成之以水系接著劑製作之偏光板。 In addition, () shows the polarizing plate of the same structure made with the water-based adhesive agent.

製造例33 偏光板I-2(偏光板A-2)：單體穿透率為42.0% Production Example 33 Polarizing plate I-2 (polarizing plate A-2): monomer transmittance is 42.0%

製造例34 偏光板J-2(偏光板B-2)：單體穿透率為42.5% Production Example 34 Polarizing plate J-2 (polarizing plate B-2): monomer transmittance is 42.5%

製造例35 偏光板K-2(偏光板C-2)：單體穿透率為42.3% Production Example 35 Polarizing Plate K-2 (Polarizing Plate C-2): Monomer transmittance is 42.3%

製造例36 偏光板L-2(偏光板D-2)：單體穿透率為42.0% Production Example 36 Polarizing Plate L-2 (Polarizing Plate D-2): Monomer transmittance is 42.0%

製造例37 偏光板M-2(偏光板E-2)：單體穿透率為42.5% Production Example 37 Polarizing Plate M-2 (Polarizing Plate E-2): The monomer transmittance is 42.5%

製造例38 偏光板N-2(偏光板F-2)：單體穿透率為42.3% Production Example 38 Polarizing plate N-2 (polarizing plate F-2): monomer transmittance is 42.3%

製造例39 偏光板O-2(偏光板G-2)：單體穿透率為42.3% Production Example 39 Polarizing plate O-2 (polarizing plate G-2): monomer transmittance is 42.3%

製造例40 偏光板P-2(偏光板H-2)：單體穿透率為41.2% Production Example 40 Polarizing Plate P-2 (Polarizing Plate H-2): Monomer transmittance is 41.2%

[製造例41] [Production Example 41]

(偏光板Q-2之製作) (Production of polarizer Q-2)

除了將偏光板A-2中之偏光膜1變更為偏光膜4以外，以同樣方式製作偏光板。偏光板Q-2之單體穿透率為42.0%。 A polarizing plate was produced in the same manner except that the polarizing film 1 in the polarizing plate A-2 was changed to the polarizing film 4. The monomer penetration rate of polarizing plate Q-2 was 42.0%.

[製造例42] [Production Example 42]

(偏光板R-2之製作) (Production of polarizer R-2)

除了將偏光板B-2中之偏光膜1變更為偏光膜4以外，以同樣方式製作偏光板。偏光板R-2之單體穿透率為42.5%。 A polarizing plate was produced in the same manner except that the polarizing film 1 in the polarizing plate B-2 was changed to the polarizing film 4. The monomer penetration rate of polarizing plate R-2 was 42.5%.

[實施例1] [Example 1]

使用黏著劑B，以使偏光板之吸收軸互相平行之方式，將偏光板A-1中之偏光膜1與偏光板B-1中之偏光膜1貼合。此時，事先對欲貼合之偏光膜表面及黏著劑表面進行電暈處理。於如此所得之複合偏光板之保護膜B側貼合黏著劑A。貼合黏著劑A時，亦事先對保護膜表面及黏著劑表面進行電暈處理。複合偏光板之偏光度為99.998%，單體穿透率為38.6%。 Using the adhesive B, the polarizing film 1 in the polarizing plate A-1 and the polarizing film 1 in the polarizing plate B-1 are bonded so that the absorption axes of the polarizing plates are parallel to each other. At this time, corona treatment is performed on the polarizing film surface and the adhesive surface to be bonded in advance. Adhesive A was bonded to the protective film B side of the composite polarizing plate thus obtained. When attaching Adhesive A, corona treatment is also performed on the surface of the protective film and the surface of the adhesive in advance. The polarization degree of the composite polarizer is 99.998%, and the monomer penetration rate is 38.6%.

將所製作之複合偏光板切為40mm見方，貼合於Corning公司製之EAGLE XG，製作耐熱評估用試樣。將如此所製作之試樣投入95℃之烘箱中1000小時。耐熱試驗後之偏光度為99.996%。 The produced composite polarizing plate was cut into 40 mm squares and attached to EAGLE XG manufactured by Corning Corporation to prepare samples for heat resistance evaluation. The sample thus prepared was put into an oven at 95°C for 1000 hours. The polarization degree after the heat resistance test was 99.996%.

[實施例2] [Example 2]

使用黏著劑B，以使偏光板之吸收軸互相平行之方式，將偏光板A-1中之偏光膜1與偏光板C-1中之偏光膜1貼合。此時，事先對欲貼合之偏光膜表面及黏著劑表面進行電暈處理。於如此所得之複合偏光板之保護膜C側貼合黏著劑A。貼合黏著劑A時，亦事先對保護膜表面及黏著劑表面進行電暈處理。複合偏光板之偏光度為99.998%，單體穿透率為38.6%。 Using the adhesive B, the polarizing film 1 in the polarizing plate A-1 and the polarizing film 1 in the polarizing plate C-1 are bonded so that the absorption axes of the polarizing plates are parallel to each other. At this time, corona treatment is performed on the polarizing film surface and the adhesive surface to be bonded in advance. Adhesive A was bonded to the protective film C side of the composite polarizing plate thus obtained. When attaching Adhesive A, corona treatment is also performed on the surface of the protective film and the surface of the adhesive in advance. The polarization degree of the composite polarizer is 99.998%, and the monomer penetration rate is 38.6%.

將所製作之複合偏光板切為40mm見方，貼合於Corning公司製之EAGLE XG，製作耐熱評估用試樣。將如此所製作之試樣投入95℃之烘箱中1000小時。耐熱 試驗後之偏光度為99.996%。 The produced composite polarizing plate was cut into 40 mm squares and attached to EAGLE XG manufactured by Corning Corporation to prepare samples for heat resistance evaluation. The sample thus prepared was put into an oven at 95°C for 1000 hours. Heat-resistant The polarization degree after the test was 99.996%.

[實施例3] [Example 3]

使用黏著劑B，以使偏光板之吸收軸互相平行之方式，將偏光板D-1中之偏光膜2與偏光板E-1中之偏光膜2貼合。此時，事先對欲貼合之偏光膜表面及黏著劑表面進行電暈處理。於如此所得之複合偏光板之保護膜B側貼合黏著劑A。貼合黏著劑A時，亦事先對保護膜表面及黏著劑表面進行電暈處理。複合偏光板之偏光度為99.998%，單體穿透率為38.6%。 Using the adhesive B, the polarizing film 2 in the polarizing plate D-1 and the polarizing film 2 in the polarizing plate E-1 are bonded so that the absorption axes of the polarizing plates are parallel to each other. At this time, corona treatment is performed on the polarizing film surface and the adhesive surface to be bonded in advance. Adhesive A was bonded to the protective film B side of the composite polarizing plate thus obtained. When attaching Adhesive A, corona treatment is also performed on the surface of the protective film and the surface of the adhesive in advance. The polarization degree of the composite polarizer is 99.998%, and the monomer penetration rate is 38.6%.

將所製作之複合偏光板切為40mm見方，貼合於Corning公司製之EAGLE XG，製作耐熱評估用試樣。將如此所製作之試樣投入95℃之烘箱中1000小時。耐熱試驗後之偏光度為99.997%。 The produced composite polarizing plate was cut into 40 mm squares and attached to EAGLE XG manufactured by Corning Corporation to prepare samples for heat resistance evaluation. The sample thus prepared was put into an oven at 95°C for 1000 hours. The polarization degree after the heat resistance test was 99.997%.

[實施例4] [Example 4]

使用黏著劑B，以使偏光板之吸收軸互相平行之方式，將偏光板D-1中之偏光膜2與偏光板F-1中之偏光膜2貼合。此時，事先對欲貼合之偏光膜表面及黏著劑表面進行電暈處理。於如此所得之複合偏光板之保護膜C側貼合黏著劑A。貼合黏著劑A時，亦事先對保護膜表面及黏著劑表面進行電暈處理。複合偏光板之偏光度為99.998%，單體穿透率為38.6%。 Using the adhesive B, the polarizing film 2 in the polarizing plate D-1 and the polarizing film 2 in the polarizing plate F-1 are bonded so that the absorption axes of the polarizing plates are parallel to each other. At this time, corona treatment is performed on the polarizing film surface and the adhesive surface to be bonded in advance. Adhesive A was bonded to the protective film C side of the composite polarizing plate thus obtained. When attaching Adhesive A, corona treatment is also performed on the surface of the protective film and the surface of the adhesive in advance. The polarization degree of the composite polarizer is 99.998%, and the monomer penetration rate is 38.6%.

將所製作之複合偏光板切為40mm見方，貼 合於Corning公司製之EAGLE XG，製作耐熱評估用試樣。將如此所製作之試樣投入95℃之烘箱中1000小時。耐熱試驗後之偏光度為99.997%。 Cut the produced composite polarizer into 40mm square and paste Combined with EAGLE XG manufactured by Corning Corporation, a sample for heat resistance evaluation was prepared. The sample thus prepared was put into an oven at 95°C for 1000 hours. The polarization degree after the heat resistance test was 99.997%.

[實施例5] [Example 5]

使用黏著劑B，以使偏光板之吸收軸互相平行之方式，將偏光板A-1中之偏光膜1與偏光板F-1中之偏光膜2貼合。此時，事先對欲貼合之偏光膜表面及黏著劑表面進行電暈處理。於如此所得之複合偏光板之保護膜C側貼合黏著劑A。貼合黏著劑A時，亦事先對保護膜表面及黏著劑表面進行電暈處理。複合偏光板之偏光度為99.998%，單體穿透率為38.6%。 Using the adhesive B, the polarizing film 1 in the polarizing plate A-1 and the polarizing film 2 in the polarizing plate F-1 are bonded so that the absorption axes of the polarizing plates are parallel to each other. At this time, corona treatment is performed on the polarizing film surface and the adhesive surface to be bonded in advance. Adhesive A was bonded to the protective film C side of the composite polarizing plate thus obtained. When attaching Adhesive A, corona treatment is also performed on the surface of the protective film and the surface of the adhesive in advance. The polarization degree of the composite polarizer is 99.998%, and the monomer penetration rate is 38.6%.

將所製作之複合偏光板切為40mm見方，貼合於Corning公司製之EAGLE XG，製作耐熱評估用試樣。將如此所製作之試樣投入95℃之烘箱中1000小時。耐熱試驗後之偏光度為99.996%。 The produced composite polarizing plate was cut into 40 mm squares and attached to EAGLE XG manufactured by Corning Corporation to prepare samples for heat resistance evaluation. The sample thus prepared was put into an oven at 95°C for 1000 hours. The polarization degree after the heat resistance test was 99.996%.

[實施例6] [Example 6]

使用黏著劑B，以使偏光板之吸收軸互相平行之方式，將偏光板D-1中之偏光膜2與偏光板C-1中之偏光膜1貼合。此時，事先對欲貼合之偏光膜表面及黏著劑表面進行電暈處理。於如此所得之複合偏光板之保護膜C側貼合黏著劑A。貼合黏著劑A時，亦事先對保護膜表面及黏著劑表面進行電暈處理。複合偏光板之偏光度為 99.998%，單體穿透率為38.6%。 Using the adhesive B, the polarizing film 2 in the polarizing plate D-1 and the polarizing film 1 in the polarizing plate C-1 are bonded so that the absorption axes of the polarizing plates are parallel to each other. At this time, corona treatment is performed on the polarizing film surface and the adhesive surface to be bonded in advance. Adhesive A was bonded to the protective film C side of the composite polarizing plate thus obtained. When attaching Adhesive A, corona treatment is also performed on the surface of the protective film and the surface of the adhesive in advance. The polarization degree of the composite polarizer is 99.998%, monomer penetration rate is 38.6%.

將所製作之複合偏光板切為40mm見方，貼合於Corning公司製之EAGLE XG，製作耐熱評估用試樣。將如此所製作之試樣投入95℃之烘箱中1000小時。耐熱試驗後之偏光度為99.996%。 The produced composite polarizing plate was cut into 40 mm squares and attached to EAGLE XG manufactured by Corning Corporation to prepare samples for heat resistance evaluation. The sample thus prepared was put into an oven at 95°C for 1000 hours. The polarization degree after the heat resistance test was 99.996%.

[實施例7] [Example 7]

使用黏著劑B，以使偏光板之吸收軸互相平行之方式，將偏光板H-1中之偏光膜3與偏光板C-1中之偏光膜1貼合。此時，事先對欲貼合之偏光膜表面及黏著劑表面進行電暈處理。於如此所得之複合偏光板之保護膜C側貼合黏著劑A。貼合黏著劑A時，亦事先對保護膜表面及黏著劑表面進行電暈處理。複合偏光板之偏光度為99.997%，單體穿透率為37.9%。 Using the adhesive B, the polarizing film 3 in the polarizing plate H-1 and the polarizing film 1 in the polarizing plate C-1 are bonded so that the absorption axes of the polarizing plates are parallel to each other. At this time, corona treatment is performed on the polarizing film surface and the adhesive surface to be bonded in advance. Adhesive A was bonded to the protective film C side of the composite polarizing plate thus obtained. When attaching Adhesive A, corona treatment is also performed on the surface of the protective film and the surface of the adhesive in advance. The polarization degree of the composite polarizing plate is 99.997%, and the monomer transmission rate is 37.9%.

將所製作之複合偏光板切為40mm見方，貼合於Corning公司製之EAGLE XG，製作耐熱評估用試樣。將如此所製作之試樣投入95℃之烘箱中1000小時。耐熱試驗後之偏光度為99.996%。 The produced composite polarizing plate was cut into 40 mm squares and attached to EAGLE XG manufactured by Corning Corporation to prepare samples for heat resistance evaluation. The sample thus prepared was put into an oven at 95°C for 1000 hours. The polarization degree after the heat resistance test was 99.996%.

[實施例8] [Example 8]

除了將實施例1之偏光板A-1變更為偏光板I-1，將偏光板B-1變更為偏光板J-1以外，以同樣方式製作複合偏光板。複合偏光板之偏光度為99.998%，單體穿透為率38.6%。 A composite polarizing plate was produced in the same manner except that the polarizing plate A-1 of Example 1 was changed to the polarizing plate I-1 and the polarizing plate B-1 was changed to the polarizing plate J-1. The polarization degree of the composite polarizer is 99.998%, and the single penetration rate is 38.6%.

將所製作之複合偏光板切為40mm見方，貼合於Corning公司製之EAGLE XG，製作耐熱評估用試樣。將如此所製作之試樣投入95℃之烘箱中1000小時。耐熱試驗後之偏光度為99.996%。 The produced composite polarizing plate was cut into 40 mm squares and attached to EAGLE XG manufactured by Corning Corporation to prepare samples for heat resistance evaluation. The sample thus prepared was put into an oven at 95°C for 1000 hours. The polarization degree after the heat resistance test was 99.996%.

[實施例9] [Example 9]

除了將實施例2之偏光板A-1變更為偏光板I-1，將偏光板C-1變更為偏光板K-1以外，以同樣方式製作複合偏光板。複合偏光板之偏光度為99.998%，單體穿透率為38.6%。 A composite polarizing plate was produced in the same manner except that the polarizing plate A-1 of Example 2 was changed to the polarizing plate I-1 and the polarizing plate C-1 was changed to the polarizing plate K-1. The polarization degree of the composite polarizer is 99.998%, and the monomer penetration rate is 38.6%.

將所製作之複合偏光板切為40mm見方，貼合於Corning公司製之EAGLE XG，製作耐熱評估用試樣。將如此所製作之試樣投入95℃之烘箱中1000小時。耐熱試驗後之偏光度為99.996%。 The produced composite polarizing plate was cut into 40 mm squares and attached to EAGLE XG manufactured by Corning Corporation to prepare samples for heat resistance evaluation. The sample thus prepared was put into an oven at 95°C for 1000 hours. The polarization degree after the heat resistance test was 99.996%.

[實施例10] [Example 10]

除了將實施例3之偏光板D-1變更為偏光板L-1，將偏光板E-1變更為偏光板M-1以外，以同樣方式製作複合偏光板。複合偏光板之偏光度為99.998%，單體穿透率為38.6%。 A composite polarizing plate was produced in the same manner except that the polarizing plate D-1 of Example 3 was changed to the polarizing plate L-1 and the polarizing plate E-1 was changed to the polarizing plate M-1. The polarization degree of the composite polarizer is 99.998%, and the monomer penetration rate is 38.6%.

將所製作之複合偏光板切為40mm見方，貼合於Corning公司製之EAGLE XG，製作耐熱評估用試樣。將如此所製作之試樣投入95℃之烘箱中1000小時。耐熱試驗後之偏光度為99.997%。 The produced composite polarizing plate was cut into 40 mm squares and attached to EAGLE XG manufactured by Corning Corporation to prepare samples for heat resistance evaluation. The sample thus prepared was put into an oven at 95°C for 1000 hours. The polarization degree after the heat resistance test was 99.997%.

[實施例11] [Example 11]

除了將實施例4之偏光板D-1變更為偏光板L-1，將偏光板F-1變更為偏光板N-1以外，以同樣方式製作複合偏光板。複合偏光板之偏光度為99.998%，單體穿透率為38.6%。 A composite polarizing plate was produced in the same manner except that the polarizing plate D-1 of Example 4 was changed to the polarizing plate L-1 and the polarizing plate F-1 was changed to the polarizing plate N-1. The polarization degree of the composite polarizer is 99.998%, and the monomer penetration rate is 38.6%.

將所製作之複合偏光板切為40mm見方，貼合於Corning公司製之EAGLE XG，製作耐熱評估用試樣。將如此所製作之試樣投入95℃之烘箱中1000小時。耐熱試驗後之偏光度為99.997%。 The produced composite polarizing plate was cut into 40 mm squares and attached to EAGLE XG manufactured by Corning Corporation to prepare samples for heat resistance evaluation. The sample thus prepared was put into an oven at 95°C for 1000 hours. The polarization degree after the heat resistance test was 99.997%.

[實施例12] [Example 12]

除了將實施例5之偏光板A-1變更為偏光板I-1，將偏光板F-1變更為偏光板N-1以外，以同樣方式製作複合偏光板。複合偏光板之偏光度為99.998%，單體穿透率為38.6%。 A composite polarizing plate was produced in the same manner except that the polarizing plate A-1 of Example 5 was changed to the polarizing plate I-1 and the polarizing plate F-1 was changed to the polarizing plate N-1. The polarization degree of the composite polarizer is 99.998%, and the monomer penetration rate is 38.6%.

將所製作之複合偏光板切為40mm見方，貼合於Corning公司製之EAGLE XG，製作耐熱評估用試樣。將如此所製作之試樣投入95℃之烘箱中1000小時。耐熱試驗後之偏光度為99.996%。 The produced composite polarizing plate was cut into 40 mm squares and attached to EAGLE XG manufactured by Corning Corporation to prepare samples for heat resistance evaluation. The sample thus prepared was put into an oven at 95°C for 1000 hours. The polarization degree after the heat resistance test was 99.996%.

[實施例13] [Example 13]

除了將實施例6之偏光板D-1變更為偏光板L-1，將偏光板C-1變更為偏光板K-1以外，以同樣方式製作複合 偏光板。複合偏光板之偏光度為99.998%，單體穿透率為38.6%。 A composite was produced in the same manner except that the polarizing plate D-1 of Example 6 was changed to polarizing plate L-1 and the polarizing plate C-1 was changed to polarizing plate K-1 Polarizer. The polarization degree of the composite polarizer is 99.998%, and the monomer penetration rate is 38.6%.

將所製作之複合偏光板切為40mm見方，貼合於Corning公司製之EAGLE XG，製作耐熱評估用試樣。將如此所製作之試樣投入95℃之烘箱中1000小時。耐熱試驗後之偏光度為99.996%。 The produced composite polarizing plate was cut into 40 mm squares and attached to EAGLE XG manufactured by Corning Corporation to prepare samples for heat resistance evaluation. The sample thus prepared was put into an oven at 95°C for 1000 hours. The polarization degree after the heat resistance test was 99.996%.

[實施例14] [Example 14]

除了將實施例7之偏光板H-1變更為偏光板P-1，將偏光板C-1變更為偏光板K-1以外，以同樣方式製作複合偏光板。複合偏光板之偏光度為99.997%，單體穿透率為37.9%。 A composite polarizing plate was produced in the same manner except that the polarizing plate H-1 of Example 7 was changed to the polarizing plate P-1 and the polarizing plate C-1 was changed to the polarizing plate K-1. The polarization degree of the composite polarizing plate is 99.997%, and the monomer transmission rate is 37.9%.

將所製作之複合偏光板切為40mm見方，貼合於Corning公司製之EAGLE XG，製作耐熱評估用試樣。將如此所製作之試樣投入95℃之烘箱中1000小時。耐熱試驗後之偏光度為99.996%。 The produced composite polarizing plate was cut into 40 mm squares and attached to EAGLE XG manufactured by Corning Corporation to prepare samples for heat resistance evaluation. The sample thus prepared was put into an oven at 95°C for 1000 hours. The polarization degree after the heat resistance test was 99.996%.

[實施例15] [Example 15]

使用黏著劑B，以使偏光板之吸收軸互相平行之方式，將偏光板A-2中之保護膜B與偏光板B-2中之偏光膜1貼合。此時，事先對欲貼合之保護膜表面、偏光膜表面及黏著劑表面進行電暈處理。於如此所得之複合偏光板之成為最外層之保護膜B側貼合黏著劑A。貼合黏著劑A時，亦事先對保護膜表面及黏著劑表面進行電暈處理。複合偏 光板之偏光度為99.998%，單體穿透率為38.6%。 Using the adhesive B, the protective film B in the polarizing plate A-2 and the polarizing film 1 in the polarizing plate B-2 are bonded in such a manner that the absorption axes of the polarizing plates are parallel to each other. At this time, corona treatment is performed on the surface of the protective film, the surface of the polarizing film and the surface of the adhesive to be bonded in advance. Adhesive A was attached to the protective film B side of the composite polarizing plate thus obtained as the outermost layer. When attaching Adhesive A, corona treatment is also performed on the surface of the protective film and the surface of the adhesive in advance. Compound bias The polarizing degree of the light plate is 99.998%, and the monomer penetration rate is 38.6%.

將所製作之複合偏光板切為40mm見方，貼合於Corning公司製之EAGLE XG，製作耐熱評估用試樣。將如此所製作之試樣投入95℃之烘箱中1000小時。耐熱試驗後之偏光度為99.996%。 The produced composite polarizing plate was cut into 40 mm squares and attached to EAGLE XG manufactured by Corning Corporation to prepare samples for heat resistance evaluation. The sample thus prepared was put into an oven at 95°C for 1000 hours. The polarization degree after the heat resistance test was 99.996%.

[實施例16] [Example 16]

使用黏著劑B，以使偏光板之吸收軸互相平行之方式，將偏光板A-2中之保護膜B與偏光板C-2中之偏光膜1貼合。此時，事先對欲貼合之保護膜表面、偏光膜表面及黏著劑表面進行電暈處理。於如此所得之複合偏光板之保護膜C側貼合黏著劑A。貼合黏著劑A時，亦事先對保護膜表面及黏著劑表面進行電暈處理。複合偏光度為99.998%，單體穿透率為38.6%。 Using the adhesive B, the protective film B in the polarizing plate A-2 and the polarizing film 1 in the polarizing plate C-2 are laminated so that the absorption axes of the polarizing plates are parallel to each other. At this time, corona treatment is performed on the surface of the protective film, the surface of the polarizing film and the surface of the adhesive to be bonded in advance. Adhesive A was bonded to the protective film C side of the composite polarizing plate thus obtained. When attaching Adhesive A, corona treatment is also performed on the surface of the protective film and the surface of the adhesive in advance. The composite polarization degree is 99.998%, and the monomer penetration rate is 38.6%.

將所製作之複合偏光板切為40mm見方，貼合於Corning公司製之EAGLE XG，製作耐熱評估用試樣。將如此所製作之試樣投入95℃之烘箱中1000小時。耐熱試驗後之偏光度為99.996%。 The produced composite polarizing plate was cut into 40 mm squares and attached to EAGLE XG manufactured by Corning Corporation to prepare samples for heat resistance evaluation. The sample thus prepared was put into an oven at 95°C for 1000 hours. The polarization degree after the heat resistance test was 99.996%.

[實施例17] [Example 17]

使用黏著劑B，以使偏光板之吸收軸互相平行之方式，將偏光板D-2中之保護膜B與偏光板E-2中之偏光膜2貼合。此時，事先對欲貼合之保護膜表面、偏光膜表面及黏著劑表面進行電暈處理。於如此所得之複合偏光板之 成為最外層之保護膜B側貼合黏著劑A。貼合黏著劑A時，亦事先對保護膜表面及黏著劑表面進行電暈處理。複合偏光板之偏光度為99.998%，單體穿透率為38.6%。 Using the adhesive B, the protective film B in the polarizing plate D-2 and the polarizing film 2 in the polarizing plate E-2 are bonded in such a manner that the absorption axes of the polarizing plates are parallel to each other. At this time, corona treatment is performed on the surface of the protective film, the surface of the polarizing film and the surface of the adhesive to be bonded in advance. Of the composite polarizers thus obtained Adhesive A is attached to the outermost protective film B side. When attaching Adhesive A, corona treatment is also performed on the surface of the protective film and the surface of the adhesive in advance. The polarization degree of the composite polarizer is 99.998%, and the monomer penetration rate is 38.6%.

將所製作之複合偏光板切為40mm見方，貼合於Corning公司製之EAGLE XG，製作耐熱評估用試樣。將如此所製作之試樣投入95℃之烘箱中1000小時。耐熱試驗後之偏光度為99.997%。 The produced composite polarizing plate was cut into 40 mm squares and attached to EAGLE XG manufactured by Corning Corporation to prepare samples for heat resistance evaluation. The sample thus prepared was put into an oven at 95°C for 1000 hours. The polarization degree after the heat resistance test was 99.997%.

[實施例18] [Example 18]

使用黏著劑B，以使偏光板之吸收軸互相平行之方式，將偏光板D-2中之保護膜B與偏光板F-2中之偏光膜2貼合。此時，事先對欲貼合之保護膜表面、偏光膜表面及黏著劑表面進行電暈處理。於如此所得之複合偏光板之保護膜C側貼合黏著劑A。貼合黏著劑A時，亦事先對保護膜表面及黏著劑表面進行電暈處理。複合偏光板之偏光度為99.998%，單體穿透率為38.6%。 Using the adhesive B, the protective film B in the polarizing plate D-2 and the polarizing film 2 in the polarizing plate F-2 are bonded in such a manner that the absorption axes of the polarizing plates are parallel to each other. At this time, corona treatment is performed on the surface of the protective film, the surface of the polarizing film and the surface of the adhesive to be bonded in advance. Adhesive A was bonded to the protective film C side of the composite polarizing plate thus obtained. When attaching Adhesive A, corona treatment is also performed on the surface of the protective film and the surface of the adhesive in advance. The polarization degree of the composite polarizer is 99.998%, and the monomer penetration rate is 38.6%.

將所製作之複合偏光板切為40mm見方，貼合於Corning公司製之EAGLE XG，製作耐熱評估用試樣。將如此所製作之試樣投入95℃之烘箱中1000小時。耐熱試驗後之偏光度為99.997%。 The produced composite polarizing plate was cut into 40 mm squares and attached to EAGLE XG manufactured by Corning Corporation to prepare samples for heat resistance evaluation. The sample thus prepared was put into an oven at 95°C for 1000 hours. The polarization degree after the heat resistance test was 99.997%.

[實施例19] [Example 19]

使用黏著劑B，以使偏光板之吸收軸互相平行之方式，將偏光板A-2中之保護膜B與偏光板F-2中之偏光膜 2貼合。此時，事先對欲貼合之保護膜表面、偏光膜表面及黏著劑表面進行電暈處理。於如此所得之複合偏光板之保護膜C側貼合黏著劑A。貼合黏著劑A時，亦事先對保護膜表面及黏著劑表面進行電暈處理。複合偏光板之偏光度為99.998%，單體穿透率為38.6%。 Using the adhesive B, the protective film B in the polarizing plate A-2 and the polarizing film in the polarizing plate F-2 are aligned in such a manner that the absorption axes of the polarizing plates are parallel to each other 2 fit. At this time, corona treatment is performed on the surface of the protective film, the surface of the polarizing film and the surface of the adhesive to be bonded in advance. Adhesive A was bonded to the protective film C side of the composite polarizing plate thus obtained. When attaching Adhesive A, corona treatment is also performed on the surface of the protective film and the surface of the adhesive in advance. The polarization degree of the composite polarizer is 99.998%, and the monomer penetration rate is 38.6%.

將所製作之複合偏光板切為40mm見方，貼合於Corning公司製之EAGLE XG，製作耐熱評估用試樣。將如此所製作之試樣投入95℃之烘箱中1000小時。耐熱試驗後之偏光度為99.996%。 The produced composite polarizing plate was cut into 40 mm squares and attached to EAGLE XG manufactured by Corning Corporation to prepare samples for heat resistance evaluation. The sample thus prepared was put into an oven at 95°C for 1000 hours. The polarization degree after the heat resistance test was 99.996%.

[實施例20] [Example 20]

使用黏著劑B，以使偏光板之吸收軸互相平行之方式，將偏光板D-2中之保護膜B與偏光板C-2中之偏光膜1貼合。此時，事先對欲貼合之保護膜表面、偏光膜表面及黏著劑表面進行電暈處理。於如此所得之複合偏光板之保護膜C側貼合黏著劑A。貼合黏著劑A時，亦事先對保護膜表面及黏著劑表面進行電暈處理。複合偏光板之偏光度為99.998%，單體穿透率為38.6%。 Using the adhesive B, the protective film B in the polarizing plate D-2 and the polarizing film 1 in the polarizing plate C-2 are bonded in such a manner that the absorption axes of the polarizing plates are parallel to each other. At this time, corona treatment is performed on the surface of the protective film, the surface of the polarizing film and the surface of the adhesive to be bonded in advance. Adhesive A was bonded to the protective film C side of the composite polarizing plate thus obtained. When attaching Adhesive A, corona treatment is also performed on the surface of the protective film and the surface of the adhesive in advance. The polarization degree of the composite polarizer is 99.998%, and the monomer penetration rate is 38.6%.

將所製作之複合偏光板切為40mm見方，貼合於Corning公司製之EAGLE XG，製作耐熱評估用試樣。將如此所製作之試樣投入95℃之烘箱中1000小時。耐熱試驗後之偏光度為99.996%。 The produced composite polarizing plate was cut into 40 mm squares and attached to EAGLE XG manufactured by Corning Corporation to prepare samples for heat resistance evaluation. The sample thus prepared was put into an oven at 95°C for 1000 hours. The polarization degree after the heat resistance test was 99.996%.

[實施例21] [Example 21]

使用黏著劑B，以使偏光板之吸收軸互相平行之方式，將偏光板H-2中之保護膜B與偏光板C-2中之偏光膜1貼合。此時，事先對欲貼合之保護膜表面、偏光膜表面及黏著劑表面進行電暈處理。於如此所得之複合偏光板之保護膜C側貼合黏著劑A。貼合黏著劑A時，亦事先對保護膜表面及黏著劑表面進行電暈處理。複合偏光度為99.997%，單體穿透率為37.9%。 Using the adhesive B, the protective film B in the polarizing plate H-2 and the polarizing film 1 in the polarizing plate C-2 are bonded in such a manner that the absorption axes of the polarizing plates are parallel to each other. At this time, corona treatment is performed on the surface of the protective film, the surface of the polarizing film and the surface of the adhesive to be bonded in advance. Adhesive A was bonded to the protective film C side of the composite polarizing plate thus obtained. When attaching Adhesive A, corona treatment is also performed on the surface of the protective film and the surface of the adhesive in advance. The composite polarization degree was 99.997%, and the monomer penetration rate was 37.9%.

將所製作之複合偏光板切為40mm見方，貼合於Corning公司製之EAGLE XG，製作耐熱評估用試樣。將如此所製作之試樣投入95℃之烘箱中1000小時。耐熱試驗後之偏光度為99.996%。 The produced composite polarizing plate was cut into 40 mm squares and attached to EAGLE XG manufactured by Corning Corporation to prepare samples for heat resistance evaluation. The sample thus prepared was put into an oven at 95°C for 1000 hours. The polarization degree after the heat resistance test was 99.996%.

[實施例22] [Example 22]

除了將實施例15之偏光板A-2變更為偏光板I-2，將偏光板B-2變更為偏光板J-2以外，以同樣方式製作複合偏光板。複合偏光板之偏光度為99.998%，單體穿透率為38.6%。 A composite polarizing plate was produced in the same manner except that the polarizing plate A-2 of Example 15 was changed to the polarizing plate I-2 and the polarizing plate B-2 was changed to the polarizing plate J-2. The polarization degree of the composite polarizer is 99.998%, and the monomer penetration rate is 38.6%.

將所製作之複合偏光板切為40mm見方，貼合於Corning公司製之EAGLE XG，製作耐熱評估用試樣。將如此所製作之試樣投入95℃之烘箱中1000小時。耐熱試驗後之偏光度為99.996%。 The produced composite polarizing plate was cut into 40 mm squares and attached to EAGLE XG manufactured by Corning Corporation to prepare samples for heat resistance evaluation. The sample thus prepared was put into an oven at 95°C for 1000 hours. The polarization degree after the heat resistance test was 99.996%.

[實施例23] [Example 23]

除了將實施例16之偏光板A-2變更為偏光板I-2，將 偏光板C-2變更為偏光板K-2以外，以同樣方式製作複合偏光板。複合偏光度為99.998%，單體穿透率為38.6%。 In addition to changing the polarizing plate A-2 of Example 16 to polarizing plate I-2, the The polarizing plate C-2 was changed to the polarizing plate K-2, and a composite polarizing plate was produced in the same manner. The composite polarization degree is 99.998%, and the monomer penetration rate is 38.6%.

將所製作之複合偏光板切為40mm見方，貼合於Corning公司製之EAGLE XG，製作耐熱評估用試樣。將如此所製作之試樣投入95℃之烘箱中1000小時。耐熱試驗後之偏光度為99.996%。 The produced composite polarizing plate was cut into 40 mm squares and attached to EAGLE XG manufactured by Corning Corporation to prepare samples for heat resistance evaluation. The sample thus prepared was put into an oven at 95°C for 1000 hours. The polarization degree after the heat resistance test was 99.996%.

[實施例24] [Example 24]

除了將實施例17之偏光板D-2變更為偏光板L-2，將偏光板E-2變更為偏光板M-2以外，以同樣方式製作複合偏光板。複合偏光板之偏光度為99.998%，單體穿透率為38.6%。 A composite polarizing plate was produced in the same manner except that the polarizing plate D-2 of Example 17 was changed to polarizing plate L-2 and polarizing plate E-2 was changed to polarizing plate M-2. The polarization degree of the composite polarizer is 99.998%, and the monomer penetration rate is 38.6%.

將所製作之複合偏光板切為40mm見方，貼合於Corning公司製之EAGLE XG，製作耐熱評估用試樣。將如此所製作之試樣投入95℃之烘箱中1000小時。耐熱試驗後之偏光度為99.997%。 The produced composite polarizing plate was cut into 40 mm squares and attached to EAGLE XG manufactured by Corning Corporation to prepare samples for heat resistance evaluation. The sample thus prepared was put into an oven at 95°C for 1000 hours. The polarization degree after the heat resistance test was 99.997%.

[實施例25] [Example 25]

除了將實施例18之偏光板D-2變更為偏光板L-2，將偏光板F-2變更為偏光板N-2以外，以同樣方式製作複合偏光板。複合偏光板之偏光度為99.998%，單體穿透率為38.6%。 A composite polarizing plate was produced in the same manner except that the polarizing plate D-2 of Example 18 was changed to polarizing plate L-2 and polarizing plate F-2 was changed to polarizing plate N-2. The polarization degree of the composite polarizer is 99.998%, and the monomer penetration rate is 38.6%.

將所製作之複合偏光板切為40mm見方，貼合於Corning公司製之EAGLE XG，製作耐熱評估用試樣。 將如此所製作之試樣投入95℃之烘箱中1000小時。耐熱試驗後之偏光度為99.997%。 The produced composite polarizing plate was cut into 40 mm squares and attached to EAGLE XG manufactured by Corning Corporation to prepare samples for heat resistance evaluation. The sample thus prepared was put into an oven at 95°C for 1000 hours. The polarization degree after the heat resistance test was 99.997%.

[實施例26] [Example 26]

除了將實施例19之偏光板A-2變更為偏光板I-2，將偏光板F-2變更為偏光板N-2以外，以同樣方式製作複合偏光板。複合偏光板之偏光度為99.998%，單體穿透率為38.6%。 A composite polarizing plate was produced in the same manner except that the polarizing plate A-2 of Example 19 was changed to polarizing plate I-2 and the polarizing plate F-2 was changed to polarizing plate N-2. The polarization degree of the composite polarizer is 99.998%, and the monomer penetration rate is 38.6%.

將所製作之複合偏光板切為40mm見方，貼合於Corning公司製之EAGLE XG，製作耐熱評估用試樣。將如此所製作之試樣投入95℃之烘箱中1000小時。耐熱試驗後之偏光度為99.996%。 The produced composite polarizing plate was cut into 40 mm squares and attached to EAGLE XG manufactured by Corning Corporation to prepare samples for heat resistance evaluation. The sample thus prepared was put into an oven at 95°C for 1000 hours. The polarization degree after the heat resistance test was 99.996%.

[實施例27] [Example 27]

除了將實施例20之偏光板D-2變更為偏光板L-2，將偏光板C-2變更為偏光板K-2以外，以同樣方式製作複合偏光板。複合偏光板之偏光度為99.998%，單體穿透率為38.6%。 A composite polarizing plate was produced in the same manner except that the polarizing plate D-2 of Example 20 was changed to the polarizing plate L-2 and the polarizing plate C-2 was changed to the polarizing plate K-2. The polarization degree of the composite polarizer is 99.998%, and the monomer penetration rate is 38.6%.

將所製作之複合偏光板切為40mm見方，貼合於Corning公司製之EAGLE XG，製作耐熱評估用試樣。將如此所製作之試樣投入95℃之烘箱中1000小時。耐熱試驗後之偏光度為99.996%。 The produced composite polarizing plate was cut into 40 mm squares and attached to EAGLE XG manufactured by Corning Corporation to prepare samples for heat resistance evaluation. The sample thus prepared was put into an oven at 95°C for 1000 hours. The polarization degree after the heat resistance test was 99.996%.

[實施例28] [Example 28]

除了將實施例21之偏光板H-2變更為偏光板P-2，將偏光板C-2變更為偏光板K-2以外，以同樣方式製作複合偏光板。複合偏光度為99.997%，單體穿透率為37.9%。 A composite polarizing plate was produced in the same manner except that the polarizing plate H-2 of Example 21 was changed to the polarizing plate P-2 and the polarizing plate C-2 was changed to the polarizing plate K-2. The composite polarization degree was 99.997%, and the monomer penetration rate was 37.9%.

將所製作之複合偏光板切為40mm見方，貼合於Corning公司製之EAGLE XG，製作耐熱評估用試樣。將如此所製作之試樣投入95℃之烘箱中1000小時。耐熱試驗後之偏光度為99.996%。 The produced composite polarizing plate was cut into 40 mm squares and attached to EAGLE XG manufactured by Corning Corporation to prepare samples for heat resistance evaluation. The sample thus prepared was put into an oven at 95°C for 1000 hours. The polarization degree after the heat resistance test was 99.996%.

[比較例1] [Comparative Example 1]

於偏光板G-1中之保護膜C上貼合黏著劑A。貼合黏著劑A時，事先對保護膜表面及黏著劑表面進行電暈處理。偏光板G-1之偏光度為99.993%。 Adhesive A is attached to the protective film C in the polarizing plate G-1. When attaching Adhesive A, corona the surface of the protective film and the surface of the adhesive in advance. The polarization degree of polarizing plate G-1 is 99.993%.

將所製作之偏光板切為40mm見方，貼合於Corning公司製之EAGLE XG，製作耐熱評估用試樣。將如此所製作之試樣投入95℃之烘箱中1000小時。耐熱試驗後之偏光度為99.94%。 The produced polarizing plate was cut into 40 mm squares and attached to EAGLE XG manufactured by Corning Corporation to prepare samples for heat resistance evaluation. The sample thus prepared was put into an oven at 95°C for 1000 hours. The polarization degree after the heat resistance test was 99.94%.

[比較例2] [Comparative Example 2]

於偏光板O-1中之保護膜C上貼合黏著劑A。貼合黏著劑A時，事先對保護膜表面及黏著劑表面進行電暈處理。偏光板O-1之偏光度為99.993%。 Adhesive A is attached to the protective film C in the polarizing plate O-1. When attaching Adhesive A, corona the surface of the protective film and the surface of the adhesive in advance. The polarization degree of polarizing plate O-1 is 99.993%.

將所製作之偏光板切為40mm見方，貼合於Corning公司製之EAGLE XG，製作耐熱評估用試樣。將如此所製作之試樣投入95℃之烘箱中1000小時。耐熱試驗 後之偏光度為99.94%。 The produced polarizing plate was cut into 40 mm squares and attached to EAGLE XG manufactured by Corning Corporation to prepare samples for heat resistance evaluation. The sample thus prepared was put into an oven at 95°C for 1000 hours. Heat resistance test The later polarization degree is 99.94%.

[比較例3] [Comparative Example 3]

除了將實施例1之偏光板A-1變更為偏光板Q-1，將偏光板B-1變更為偏光板R-1以外，以同樣方式製作複合偏光板。複合偏光板之偏光度為99.998%，單體穿透率為38.6%。 A composite polarizing plate was produced in the same manner except that the polarizing plate A-1 of Example 1 was changed to the polarizing plate Q-1 and the polarizing plate B-1 was changed to the polarizing plate R-1. The polarization degree of the composite polarizer is 99.998%, and the monomer penetration rate is 38.6%.

將所製作之複合偏光板切為40mm見方，貼合於Corning公司製之EAGLE XG，製作耐熱評估用試樣。將如此所製作之試樣投入95℃之烘箱中1000小時。耐熱試驗後之偏光度為99.996%，但在從偏光板端部算起為1mm以內的區域發生剝離。 The produced composite polarizing plate was cut into 40 mm squares and attached to EAGLE XG manufactured by Corning Corporation to prepare samples for heat resistance evaluation. The sample thus prepared was put into an oven at 95°C for 1000 hours. The polarization degree after the heat resistance test was 99.996%, but peeling occurred in a region within 1 mm from the end of the polarizing plate.

[比較例4] [Comparative Example 4]

於偏光板G-2中之保護膜C上貼合黏著劑A。貼合黏著劑A時，事先對保護膜表面及黏著劑表面進行電暈處理。偏光板G-2之偏光度為99.993%。 Adhesive A is attached to the protective film C in the polarizing plate G-2. When attaching Adhesive A, corona the surface of the protective film and the surface of the adhesive in advance. The polarization degree of polarizing plate G-2 is 99.993%.

將所製作之偏光板切為40mm見方，貼合於Corning公司製之EAGLE XG，製作耐熱評估用試樣。將如此所製作之試樣投入95℃之烘箱中1000小時。耐熱試驗後之偏光度為99.94%。 The produced polarizing plate was cut into 40 mm squares and attached to EAGLE XG manufactured by Corning Corporation to prepare samples for heat resistance evaluation. The sample thus prepared was put into an oven at 95°C for 1000 hours. The polarization degree after the heat resistance test was 99.94%.

[比較例5] [Comparative Example 5]

於偏光板O-2中之保護膜C上貼合黏著劑A。貼合黏 著劑A時，事先對保護膜表面及黏著劑表面進行電暈處理。偏光板O-2之偏光度為99.993%。 Adhesive A is attached to the protective film C in the polarizing plate O-2. Laminating When applying agent A, corona treatment is performed on the surface of the protective film and the surface of the adhesive in advance. The polarizing degree of polarizing plate O-2 is 99.993%.

將所製作之偏光板切為40mm見方，貼合於Corning公司製之EAGLE XG，製作耐熱評估用試樣。將如此所製作之試樣投入95℃之烘箱中1000小時。耐熱試驗後之偏光度為99.94%。 The produced polarizing plate was cut into 40 mm squares and attached to EAGLE XG manufactured by Corning Corporation to prepare samples for heat resistance evaluation. The sample thus prepared was put into an oven at 95°C for 1000 hours. The polarization degree after the heat resistance test was 99.94%.

[比較例6] [Comparative Example 6]

除了將實施例15之偏光板A-2變更為偏光板Q-2，將偏光板B-2變更為偏光板R-2以外，以同樣方式製作複合偏光板。複合偏光板之偏光度為99.998%，單體穿透率為38.6%。 A composite polarizing plate was produced in the same manner except that the polarizing plate A-2 of Example 15 was changed to polarizing plate Q-2 and the polarizing plate B-2 was changed to polarizing plate R-2. The polarization degree of the composite polarizer is 99.998%, and the monomer penetration rate is 38.6%.

將所製作之複合偏光板切為40mm見方，貼合於Corning公司製之EAGLE XG，製作耐熱評估用試樣。將如此所製作之試樣投入95℃之烘箱中1000小時。耐熱試驗後之偏光度為99.996%，但在從偏光板端部算起為1mm以內的區域發生剝離。 The produced composite polarizing plate was cut into 40 mm squares and attached to EAGLE XG manufactured by Corning Corporation to prepare samples for heat resistance evaluation. The sample thus prepared was put into an oven at 95°C for 1000 hours. The polarization degree after the heat resistance test was 99.996%, but peeling occurred in a region within 1 mm from the end of the polarizing plate.

將各實施例所製作之複合偏光板之層構成表示於表1及2。又，將實施例及比較例之結果表示於表3。 Tables 1 and 2 show the layer configuration of the composite polarizer produced in each example. In addition, the results of Examples and Comparative Examples are shown in Table 3.

(產業上之可利用性) (Industry availability)

若依據本發明，則可得到耐熱耐久性優異之複合偏光板及液晶面板。 According to the present invention, a composite polarizing plate and a liquid crystal panel excellent in heat resistance and durability can be obtained.

10‧‧‧複合偏光板 10‧‧‧Composite polarizer

11A‧‧‧第1偏光膜 11A‧‧‧The first polarizing film

11B‧‧‧第2偏光膜 11B‧‧‧The second polarizing film

12A‧‧‧第1保護膜 12A‧‧‧The first protective film

12B‧‧‧第2保護膜 12B‧‧‧Second protective film

13、14‧‧‧黏著劑層 13, 14‧‧‧ Adhesive layer

20‧‧‧表面處理層 20‧‧‧Surface treatment layer

Claims (6)

一種複合偏光板，其係依序積層第1保護膜、厚度15μm以下之第1偏光膜、及厚度15μm以下之第2偏光膜而成；其中，第1偏光膜之吸收軸與第2偏光膜之吸收軸所成之角係在0±5°之範圍內；第1偏光膜之厚度與第2偏光膜之厚度之差為5μm以下；於第2偏光膜之與積層有第1偏光膜之面為相反側之面，積層有第2保護膜；於第2保護膜之與積層有第2偏光膜之面為相反側之面，積層有用以貼合於液晶單元之黏著劑層；具有第1偏光膜及第1保護膜之第1偏光板之單體穿透率係小於具有第2偏光膜及第2保護膜之第2偏光板之單體穿透率。 A composite polarizing plate is formed by sequentially laminating a first protective film, a first polarizing film with a thickness of 15 μm or less, and a second polarizing film with a thickness of 15 μm or less; wherein, the absorption axis of the first polarizing film and the second polarizing film The angle formed by the absorption axis is within the range of 0±5°; the difference between the thickness of the first polarizing film and the thickness of the second polarizing film is 5 μm or less; the difference between the thickness of the second polarizing film and the layer having the first polarizing film The surface on the opposite side is laminated with the second protective film; on the surface of the second protective film that is opposite to the layer with the second polarizing film is the surface on the opposite side, the laminated layer is useful as an adhesive layer for bonding to the liquid crystal cell; 1 The unit transmittance of the first polarizing plate of the polarizing film and the first protective film is smaller than the unit transmittance of the second polarizing plate having the second polarizing film and the second protective film. 如申請專利範圍第1項所述之複合偏光板，其中，第2保護膜係含有選自由纖維素系樹脂、聚烯烴系樹脂及丙烯酸系樹脂所成群組之至少一種。 The composite polarizing plate as described in item 1 of the patent application, wherein the second protective film contains at least one selected from the group consisting of cellulose-based resins, polyolefin-based resins and acrylic resins. 如申請專利範圍第1項或第2項所述之複合偏光板，其中，第2保護膜之厚度方向之相位差值係-10至10nm。 The composite polarizing plate as described in item 1 or item 2 of the patent application range, wherein the phase difference in the thickness direction of the second protective film is -10 to 10 nm. 如申請專利範圍第1項或第2項所述之複合偏光板，其中，於第1偏光膜與第2偏光膜之間具有第3保護膜。 The composite polarizing plate as described in item 1 or 2 of the patent application scope, wherein a third protective film is provided between the first polarizing film and the second polarizing film. 如申請專利範圍第4項所述之複合偏光板，其中，第3保護膜係包含纖維素系樹脂膜，且在波長590nm之面 內之相位差值Re(590)為10nm以下，在波長590nm之厚度方向之相位差值Rth(590)之絕對值為10nm以下者。 The composite polarizing plate as described in item 4 of the patent application range, wherein the third protective film includes a cellulose resin film and has a wavelength of 590 nm The internal retardation value Re(590) is 10 nm or less, and the absolute value of the retardation value Rth(590) in the thickness direction at a wavelength of 590 nm is 10 nm or less. 一種液晶面板，其係於液晶單元之至少一側之面配置有申請專利範圍第1項或第2項所述之複合偏光板。 A liquid crystal panel in which a composite polarizing plate as described in item 1 or 2 of the patent application scope is arranged on at least one side of a liquid crystal cell.

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