TW201331642A - Method of manufacturing polarizing plate - Google Patents

Abstract

The present invention provides a method of manufacturing a polarizing plate having a transparent film being attached to one or both sides of a polarizing film, which is characterized by comprising: a coating step include coating an active energy ray hardening adhesive on one side of the transparent film, or on one or both sides of the polarizing film; a pasting step include forming a laminate with the transparent film laminated on one or both sides of the polarizing film via the adhesive, and then pasting the laminate clipped by a pair of pasting rollers rotating toward the direction of transport, wherein at least one roller is pressed toward to another pasting roller in order to paste the transparent film and the polarizing film; the irradiating steps include irradiating the laminate with active energy rays in order to harden the adhesive, wherein a dust removal roll is provided in contact with at least one of the pair of pasting rollers for removing the dust attached on the surface of the laminating roll.

Description

偏光板之製造方法 Method for manufacturing polarizing plate

本發明係關於一種有用於作為構成液晶顯示裝置等的光學零件之一的偏光板之製造方法。 The present invention relates to a method of manufacturing a polarizing plate which is used as one of optical parts constituting a liquid crystal display device or the like.

偏光膜，係以二色性色素吸附配向於聚乙烯醇系樹脂薄膜者被廣泛使用，已知有以碘作為二色性色素之碘系偏光膜、以二色性直接染料作為二色性色素之染料系偏光膜等。該些偏光膜，通常於其單面或兩面透過接合劑貼合三乙醯纖維素膜等的透明薄膜，成為偏光板。 The polarizing film is widely used as a dichroic dye to be adsorbed to a polyvinyl alcohol resin film, and an iodine-based polarizing film containing iodine as a dichroic dye and a dichroic dye as a dichroic dye are known. The dye is a polarizing film or the like. These polarizing films are usually laminated on a single surface or both surfaces with a transparent film such as a triacetyl cellulose film through a bonding agent to form a polarizing plate.

作為將透明薄膜積層於偏光膜的單面或兩面之方法，有預先將透明薄膜的表面，塗佈活性能量線硬化型樹脂後，將偏光膜與透明薄膜，藉由一對夾滾輪(貼合滾輪)夾壓而貼合，然後，照射活性能量線而硬化接合的方法(專利文獻1：日本特開2004-245925號公報、專利文獻2：日本特開2009-134190號公報、專利文獻3：日本特開2011-95560號公報)。 As a method of laminating a transparent film on one surface or both surfaces of a polarizing film, the active energy ray-curable resin is applied to the surface of the transparent film in advance, and the polarizing film and the transparent film are bonded by a pair of nip rollers. In the case of the squeezing of the squeezing and squeezing, the active energy ray is applied to the squeezing and squeezing and squeezing and squeezing and squeezing and squeezing. Japanese Laid-Open Patent Publication No. 2011-95560).

但是，於貼合滾輪的表面，於在製造步驟產生的灰塵等異物附著的情況，由於貼合滾輪與透明薄膜在夾著異物的狀態下進行按壓，所得的積層體有所謂產生凹痕(凹入； dent)或氣泡的問題。如此的問題，於使用活性能量線硬化型樹脂作為接合劑的情況特別容易產生。與使用其他聚乙烯醇系樹脂等作為接合劑的情況比較，活性能量線硬化型樹脂因黏度高，必須對積層體施加較高的壓力。 However, in the case where the foreign matter such as dust generated in the manufacturing step adheres to the surface of the bonding roller, the bonding roller and the transparent film are pressed while sandwiching the foreign matter, and the resulting laminated body has a so-called dent (concave). Enter Dent) or bubble problem. Such a problem is particularly likely to occur when an active energy ray-curable resin is used as a bonding agent. The active energy ray-curable resin has a high viscosity, and it is necessary to apply a high pressure to the laminated body as compared with the case where another polyvinyl alcohol-based resin or the like is used as the bonding agent.

(先前技術文獻) (previous technical literature)

專利文獻1：日本特開2004-245925號公報 Patent Document 1: Japanese Laid-Open Patent Publication No. 2004-245925

專利文獻2：日本特開2009-134190號公報 Patent Document 2: Japanese Laid-Open Patent Publication No. 2009-134190

專利文獻3：日本特開2011-95560號公報 Patent Document 3: Japanese Laid-Open Patent Publication No. 2011-95560

本發明係為了解決上述課題而成者，目的為提供可防止構成偏光板之積層體(貼合滾輪與透明薄膜)產生凹痕(凹入)或氣泡的偏光板之製造方法及偏光板之製造裝置。 The present invention has been made to solve the above problems, and an object of the invention is to provide a method for producing a polarizing plate and a polarizing plate which can prevent dents (recesses) or bubbles from being formed in a laminated body (a bonding roller and a transparent film) constituting a polarizing plate. Device.

本發明係將透明薄膜貼合於偏光膜的單面或兩面所構成的偏光板之製造方法，其特徵為具備：於前述透明薄膜的單面或者前述偏光膜的單面或兩面，塗佈活性能量線硬化型接合劑之接合劑塗佈步驟；在使前述透明薄膜透過前述接合劑積層於前述偏光膜的單面或兩面所構成的積層體夾於向傳送方向旋轉的一對貼合滾輪間的狀態，藉由至少一側的滾輪朝另一側的貼合滾輪的方向按壓，以貼合前述透明薄膜與前述偏光膜之貼合步驟；以及對前述積層體照射活性能量線，使前述接合劑硬化之 活性能量線照射步驟；其中以與前述一對貼合滾輪的至少之一者接觸之方式設置除塵滾輪，以除去附著於前述貼合滾輪表面之灰塵。 The present invention relates to a method for producing a polarizing plate comprising a transparent film bonded to one surface or both surfaces of a polarizing film, comprising: coating activity on one surface of the transparent film or on one or both sides of the polarizing film a bonding agent coating step of an energy ray-curable bonding agent; and a laminated body formed by laminating the transparent film through the bonding agent on one surface or both surfaces of the polarizing film, and sandwiching between a pair of bonding rollers rotating in a conveying direction a state in which a roller of at least one side is pressed toward a bonding roller of the other side to adhere a step of bonding the transparent film to the polarizing film; and the laminated body is irradiated with an active energy ray to make the bonding Hardening An active energy ray irradiation step; wherein the dust removing roller is provided in contact with at least one of the pair of bonding rollers to remove dust adhering to the surface of the bonding roller.

再者，較理想為以與前述除塵滾輪接觸之方式，設置轉印用黏著滾輪，以除去附著於前述除塵滾輪表面之灰塵。 Further, it is preferable to provide a transfer roller for transfer so as to be in contact with the dust removing roller to remove dust adhering to the surface of the dust removing roller.

再者，本發明亦關於透明薄膜貼合於偏光膜的單面或兩面所構成的偏光板之製造裝置，其特徵為具備：於前述透明薄膜的單面或者前述偏光膜的單面或兩面，塗佈活性能量線硬化型接合劑用之接合劑塗佈裝置；一邊傳送一邊夾壓使前述透明薄膜透過前述接合劑積層於前述偏光膜的單面或兩面所構成的積層體，藉此貼合前述透明薄膜與前述偏光膜用之一對貼合滾輪；以及對前述積層體照射活性能量線，使前述接合劑硬化用之活性能量線照射裝置；其中，以與前述一對貼合滾輪的至少之一者接觸之方式設置至少一個除塵滾輪。 Further, the present invention relates to a device for manufacturing a polarizing plate comprising a transparent film bonded to one surface or both surfaces of a polarizing film, characterized in that it is provided on one surface of the transparent film or on one or both sides of the polarizing film. A bonding agent coating device for applying an active energy ray-curable bonding agent; and laminating the transparent film by laminating the above-mentioned bonding agent on one surface or both surfaces of the polarizing film while being conveyed, thereby bonding a pair of bonding rollers for the transparent film and the polarizing film; and an active energy ray irradiation device for irradiating the laminated body with an active energy ray to cure the bonding agent; wherein at least one of the pair of bonding rollers is used One of the contacts is provided with at least one dust removing roller.

根據本發明，可提供防止構成偏光板之積層體(貼合滾輪與透明薄膜)產生凹痕(凹入)或氣泡之偏光板之製造方法及偏光板之製造裝置。 According to the present invention, it is possible to provide a method for producing a polarizing plate and a polarizing plate for preventing the occurrence of dents (recesses) or bubbles in the laminated body (the bonding roller and the transparent film) constituting the polarizing plate.

1‧‧‧偏光膜 1‧‧‧ polarizing film

2,3‧‧‧透明薄膜 2,3‧‧‧Transparent film

4‧‧‧積層體(偏光板) 4‧‧‧Laminated body (polarizer)

11,12‧‧‧接合劑塗佈裝置 11,12‧‧‧Adhesive coating device

13‧‧‧滾輪(冷卻滾輪) 13‧‧‧Roller (cooling roller)

14,15,16,17,18‧‧‧活性能量線照射裝置 14,15,16,17,18‧‧‧Active energy line irradiation device

19‧‧‧傳送用夾持滾輪 19‧‧‧Transporting roller

20‧‧‧捲取滾輪 20‧‧‧Rolling wheel

51,52‧‧‧貼合滾輪 51,52‧‧‧fit roller

51a,52a‧‧‧除塵滾輪 51a, 52a‧‧‧dust removal roller

51b,52b‧‧‧轉印用黏著滾輪 51b, 52b‧‧‧Adhesive roller for transfer

第1圖為表示關於本發明的偏光板之製造裝置的一實施態樣之概略側視圖。 Fig. 1 is a schematic side view showing an embodiment of a manufacturing apparatus for a polarizing plate of the present invention.

第2圖為表示本發明一實施態樣之概略側視圖。 Fig. 2 is a schematic side view showing an embodiment of the present invention.

第3圖為表示本發明其他實施態樣之概略側視圖。 Fig. 3 is a schematic side view showing another embodiment of the present invention.

(偏光膜) (polarized film)

本發明的偏光板所使用的偏光膜，具體地為於一軸延伸的聚乙烯醇系樹脂薄膜中使二色性色素吸附配向者。聚乙烯醇系樹脂可藉由皂化聚乙酸乙烯酯系樹脂而得到。作為聚乙酸乙烯酯系樹脂，除乙酸乙烯酯的單獨聚合物之聚乙酸乙烯酯外，例如乙酸乙烯酯以及可與其共聚合之其他單體的共聚物(例如乙烯-乙酸乙烯酯共聚物)等。作為可與乙酸乙烯酯共聚合之其他單體，其他例如不飽和羧酸類、烯烴類、乙烯醚類、不飽和磺酸類、具有銨基之丙烯醯胺類等。聚乙烯醇系樹脂的皂化度為85莫耳%以上，較理想為90莫耳%以上，更理想為98至100莫耳%。聚乙烯醇系樹脂的平均聚合度，通常為1000至10000，較理想為1500至5000。該些聚乙烯醇系樹脂可為改性者，例如可使用醛類改性之聚乙烯甲醛、聚乙烯乙醛、聚乙烯丁醛等。 The polarizing film used in the polarizing plate of the present invention is specifically one in which a dichroic dye is adsorbed and aligned in a polyvinyl alcohol-based resin film extending in one axis. The polyvinyl alcohol-based resin can be obtained by saponifying a polyvinyl acetate-based resin. As the polyvinyl acetate-based resin, in addition to polyvinyl acetate of a single polymer of vinyl acetate, for example, a copolymer of vinyl acetate and other monomers copolymerizable therewith (for example, an ethylene-vinyl acetate copolymer), etc. . As other monomers copolymerizable with vinyl acetate, other examples are, for example, unsaturated carboxylic acids, olefins, vinyl ethers, unsaturated sulfonic acids, acrylamides having an ammonium group, and the like. The degree of saponification of the polyvinyl alcohol-based resin is 85 mol% or more, more preferably 90 mol% or more, and still more desirably 98 to 100 mol%. The average degree of polymerization of the polyvinyl alcohol-based resin is usually from 1,000 to 10,000, more preferably from 1,500 to 5,000. These polyvinyl alcohol-based resins may be modified, and for example, aldehyde-modified polyethylene formaldehyde, polyvinyl acetaldehyde, polyvinyl butyral or the like may be used.

如此的聚乙烯醇系樹脂所製成之膜者係被使用作為偏光膜的原料薄膜。聚乙烯醇系樹脂製膜的方法無特別限制，可使用傳統習知適當的方法製膜。由聚乙烯醇系樹脂所構成的原料薄膜的膜厚無特別限制，例如為10至150μm的程度。通常以滾輪狀供給之厚度為20至100μm的範圍內，較理想為30至80μm的範圍內，而且，工業上實用的寬度為1500至6000 mm的範圍內。 A film made of such a polyvinyl alcohol-based resin is used as a raw material film of a polarizing film. The method for forming a film of a polyvinyl alcohol-based resin is not particularly limited, and a film can be formed by a conventionally known method. The film thickness of the raw material film composed of the polyvinyl alcohol-based resin is not particularly limited, and is, for example, about 10 to 150 μm. The thickness is usually in the range of 20 to 100 μm, more preferably 30 to 80 μm, and the industrially practical width is in the range of 1,500 to 6,000 mm.

市售有原料厚度為75μm的聚乙烯醇系薄膜(Vinylon VF-PS#7500、可樂麗製(Kuraray)/OPL film M-7500、日本合成製)、原料厚度為60μm的(Vinylon VF-PS#6000、可樂麗製、Vinylon VF-PE#6000、可樂麗製)等。 A commercially available polyvinyl alcohol-based film having a thickness of 75 μm (Vinylon VF-PS #7500, Kuraray/OPL film M-7500, manufactured by Nippon Synthetic Co., Ltd.), and a raw material thickness of 60 μm (Vinylon VF-PS#) 6000, Kuraray, Vinylon VF-PE #6000, Kuraray).

偏光膜，通常係經由將聚乙烯醇系樹脂薄膜以二色性色素染色而使二色性色素吸附之步驟(染色處理步驟)、將吸附有二色性色素的聚乙烯醇系樹脂薄膜以硼酸水溶液處理之步驟(硼酸處理步驟)以及藉由該硼酸水溶液之處理後進行水洗的步驟(水洗處理步驟)製造。 The polarizing film is usually a step of adsorbing a dichroic dye by dyeing a polyvinyl alcohol-based resin film to a dichroic dye (dyeing step), and a polyvinyl alcohol-based resin film having a dichroic dye adsorbed thereon as boric acid. The aqueous solution treatment step (boric acid treatment step) and the step of washing with the aqueous boric acid solution followed by water washing (water washing treatment step) are carried out.

而且，製造偏光膜時，通常將聚乙烯醇系樹脂薄膜進行一軸延伸，該一軸延伸可在染色處理步驟前進行，可在染色處理步驟中進行，亦可在染色處理步驟後進行。一軸延伸在染色處理步驟後進行的情況，該一軸延伸可在硼酸處理步驟前進行，亦可在硼酸處理步驟中進行。當然，可在該些複數階段進行一軸延伸。 Further, in the production of the polarizing film, the polyvinyl alcohol-based resin film is usually subjected to one-axis stretching, which may be performed before the dyeing treatment step, may be carried out in the dyeing treatment step, or may be carried out after the dyeing treatment step. The one-axis extension is performed after the dyeing treatment step, which may be performed before the boric acid treatment step or in the boric acid treatment step. Of course, one-axis extension can be performed during these complex stages.

一軸延伸，可在轉速相異的滾輪間進行一軸延伸，可使用熱滾輪進行一軸延伸。而且，可為在大氣中進行延伸的乾式延伸，可為藉由溶劑膨潤的狀態下進行延伸之濕式延伸。延伸倍率通常為3至8倍的程度。 One-axis extension allows one-axis extension between rollers with different rotational speeds, and one-axis extension can be performed using a hot roller. Further, it may be a dry stretching which is extended in the atmosphere, and may be a wet stretching which is extended by a solvent swelling state. The stretching ratio is usually from 3 to 8 times.

染色處理步驟中聚乙烯醇系樹脂薄膜藉由二色性色素之染色，係例如藉由將聚乙烯醇系樹脂薄膜浸漬於含有二色性色素的水溶液進行。作為二色性色素，例如使用碘、二色性染料等。於二色性染料，包含例如C.I.直接紅39等之雙偶氮化合物所構成的二色性直接染料、三偶氮、四偶 氮等化合物所構成的二色性直接染料。再者，聚乙烯醇系樹脂薄膜，於染色處理前，較理想為實施水的浸漬處理。 In the dyeing treatment step, the polyvinyl alcohol-based resin film is dyed with a dichroic dye, for example, by immersing the polyvinyl alcohol-based resin film in an aqueous solution containing a dichroic dye. As the dichroic dye, for example, iodine, a dichroic dye or the like is used. a dichroic dye comprising a dichromatic direct dye such as C.I. Direct Red 39 or the like, trisazo, tetrapyr A dichroic direct dye composed of a compound such as nitrogen. Further, the polyvinyl alcohol-based resin film is preferably subjected to water immersion treatment before the dyeing treatment.

於使用碘作為二色性色素的情況，通常採用於含有碘及碘化鉀的水溶液，浸漬聚乙烯醇系樹脂薄膜而染色之方法。該水溶液之碘的含量，通常對水每100重量份為0.01至1重量份，碘化鉀的含量通常對水每100重量份為0.5至20重量份。於使用碘作為二色性色素的情況，染色所使用之水溶液的溫度，通常為20至40℃，在該水溶液中的浸漬時間(染色時間)，通常為20至1800秒。 When iodine is used as the dichroic dye, it is usually used in a method in which an aqueous solution containing iodine and potassium iodide is impregnated with a polyvinyl alcohol-based resin film and dyed. The content of iodine in the aqueous solution is usually 0.01 to 1 part by weight per 100 parts by weight of water, and the content of potassium iodide is usually 0.5 to 20 parts by weight per 100 parts by weight of water. In the case where iodine is used as the dichroic dye, the temperature of the aqueous solution used for dyeing is usually 20 to 40 ° C, and the immersion time (dyeing time) in the aqueous solution is usually 20 to 1800 seconds.

另一方面，於使用二色性染料作為二色性色素的情況，通常採用於包含水溶液二色性染料的水溶液中浸漬聚乙烯醇系樹脂薄膜而染色之方法。該水溶液之二色性染料的含量，通常對水每100重量份為1×10^-4至10重量份，較理想為1×10^-3至1重量份，特別理想為1×10^-3至1×10^-2重量份。該水溶液可含有硫酸鈉等無機鹽作為染色助劑。於使用二色性染料作為二色性色素的情況，染色所使用的水溶液的溫度，通常為20至80℃，而且，對該水溶液的浸漬時間(染色時間)，通常為10至1800秒。 On the other hand, when a dichroic dye is used as a dichroic dye, a method of immersing a polyvinyl alcohol-based resin film in an aqueous solution containing an aqueous dichroic dye is generally used for dyeing. The content of the dichroic dye of the aqueous solution is usually from 1 × 10 ^-4 to 10 parts by weight, more preferably from 1 × 10 ^-3 to 1 part by weight, particularly preferably from 1 × 10 ^-3 to 100 parts by weight per 100 parts by weight of water. 1 × 10 ^-2 parts by weight. The aqueous solution may contain an inorganic salt such as sodium sulfate as a dyeing aid. In the case where a dichroic dye is used as the dichroic dye, the temperature of the aqueous solution used for dyeing is usually 20 to 80 ° C, and the immersion time (dyeing time) of the aqueous solution is usually 10 to 1800 seconds.

硼酸處理步驟係將二色性色素染色之聚乙烯醇系樹脂薄膜，藉由浸漬於含有硼酸水溶液進行。含有硼酸水溶液之硼酸的量，對水每100重量份，通常為2至15重量份，較理想為5至12重量份。於上述染色處理步驟中使用碘作為二色性色素的情況，該硼酸處理步驟所使用的含有硼酸的水溶液，較理想為含有碘化鉀。於該情況，含有硼酸的 水溶液中碘化鉀的量，對水每100重量份，通常為0.1至15重量份，較理想為5至12重量份。在含有硼酸的水溶液中之浸漬時間，通常為60至1200秒，較理想為150至600秒，更理想為200至400秒。含有硼酸的水溶液之溫度，通常為40℃以上，較理想為50至85℃，更理想為55至80℃。 The boric acid treatment step is a polyvinyl alcohol-based resin film obtained by dyeing a dichroic dye, and is immersed in an aqueous solution containing boric acid. The amount of boric acid containing an aqueous boric acid solution is usually from 2 to 15 parts by weight, preferably from 5 to 12 parts by weight, per 100 parts by weight of water. In the case where iodine is used as the dichroic dye in the dyeing step, the aqueous solution containing boric acid used in the boric acid treatment step preferably contains potassium iodide. In this case, containing boric acid The amount of potassium iodide in the aqueous solution is usually 0.1 to 15 parts by weight, preferably 5 to 12 parts by weight, per 100 parts by weight of water. The immersion time in an aqueous solution containing boric acid is usually 60 to 1200 seconds, more preferably 150 to 600 seconds, still more preferably 200 to 400 seconds. The temperature of the aqueous solution containing boric acid is usually 40 ° C or higher, more preferably 50 to 85 ° C, still more preferably 55 to 80 ° C.

接著於水洗處理步驟，將上述硼酸處理後的聚乙烯醇系樹脂薄膜，例如藉由浸漬於水而進行水洗處理。水洗處理之水的溫度通常為4至40℃，浸漬時間通常為1至120秒。水洗處理後，通常實施乾燥處理，以得到偏光膜。乾燥處理，例如適合使用熱風乾燥機、遠紅外線加熱器等進行。乾燥處理的溫度，通常為30至100℃，較理想為50至80℃。乾燥處理的時間，通常為60至600秒，較理想為120至600秒。 Then, in the water washing treatment step, the boric acid-treated polyvinyl alcohol-based resin film is subjected to a water washing treatment by, for example, immersing in water. The temperature of the water to be washed is usually 4 to 40 ° C, and the immersion time is usually 1 to 120 seconds. After the water washing treatment, a drying treatment is usually carried out to obtain a polarizing film. The drying treatment is suitably carried out, for example, using a hot air dryer, a far infrared heater or the like. The temperature of the drying treatment is usually from 30 to 100 ° C, preferably from 50 to 80 ° C. The drying treatment time is usually 60 to 600 seconds, preferably 120 to 600 seconds.

如此對聚乙烯醇系樹脂薄膜，實施一軸延伸、藉由二色性色素之染色、硼酸處理以及水洗處理，以得到偏光膜。該偏光膜的厚度，通常為5至50μm的範圍內。 Thus, the polyvinyl alcohol-based resin film is subjected to one-axis stretching, dyeing with a dichroic dye, boric acid treatment, and water washing treatment to obtain a polarizing film. The thickness of the polarizing film is usually in the range of 5 to 50 μm.

(透明薄膜) (transparent film)

本發明中，於上述偏光膜的單面或兩面，貼合有透明薄膜。於透明薄膜貼合於偏光膜的兩面之情況，各別的透明薄膜可為相同，亦可為不同種類的薄膜。 In the present invention, a transparent film is bonded to one surface or both surfaces of the polarizing film. In the case where the transparent film is attached to both sides of the polarizing film, the respective transparent films may be the same or different types of films.

作為構成透明薄膜的材料，例如環烯烴系樹脂、乙酸纖維素系樹脂、如聚對苯二甲酸乙二酯、聚萘二甲酸乙二酯或聚對苯二甲酸丁二酯之聚酯系樹脂、聚碳酸酯系樹 脂、如聚甲基丙烯酸甲酯(PMMA)等之丙烯酸系樹脂、如聚丙烯等的烯烴系樹脂等，可使用本領域傳統廣為使用之薄膜材料。 As a material constituting the transparent film, for example, a cycloolefin resin, a cellulose acetate resin, a polyester resin such as polyethylene terephthalate, polyethylene naphthalate or polybutylene terephthalate Polycarbonate tree As the fat, an acrylic resin such as polymethyl methacrylate (PMMA), an olefin resin such as polypropylene, or the like, a film material widely used in the art can be used.

所謂環烯烴系樹脂，係指具有例如降莰烯、多環降莰烯系單體般之環狀烯烴(環烯烴)所構成的單體單元之熱塑性樹脂(亦稱為熱塑性環烯烴系樹脂)。環烯烴系樹脂可為上述環烯烴的開環聚合物或使用2種以上的環烯烴之開環共聚物之氫化物，亦可為環烯烴與鏈狀烯烴、具有乙烯基之芳香族化合物等的加成聚合物。而且，導入極性基者亦為有效。 The term "cycloolefin type resin" means a thermoplastic resin (also referred to as a thermoplastic cycloolefin type resin) having a monomer unit composed of a cyclic olefin (cycloolefin) such as a norbornene or a polycyclic norbornene-based monomer. . The cycloolefin resin may be a ring-opening polymer of the above cycloolefin or a hydrogenated product of a ring-opening copolymer of two or more kinds of cyclic olefins, or a cyclic olefin, a chain olefin, or an aromatic compound having a vinyl group. Addition polymer. Moreover, it is also effective to introduce a polar base.

於使用環烯烴與鏈狀烯烴或/及具有乙烯基之芳香族化合物的共聚物的情況，作為鏈狀烯烴，例如乙烯、丙烯等，而且作為具有乙烯基之芳香族化合物，例如苯乙烯、α-甲基苯乙烯、核烷基取代苯乙烯等。於如此的共聚物，環烯烴所構成的單體單元可為50莫耳%以下(較理想為15至50莫耳%)。特別是使用環烯烴、鏈狀烯烴及具有乙烯基之芳香族化合物的三元共聚物的情況，環烯烴所構成的單體單元可為比上述較少的量。於如此的三元共聚物，鏈狀烯烴所構成的單體單元，通常為5至80莫耳%，具有乙烯基之芳香族化合物所構成的單體單元，通常為5至80莫耳%。 In the case of using a copolymer of a cyclic olefin and a chain olefin or/and an aromatic compound having a vinyl group, as a chain olefin such as ethylene, propylene or the like, and as an aromatic compound having a vinyl group such as styrene or α -methylstyrene, nucleoalkyl-substituted styrene, and the like. In such a copolymer, the monomer unit of the cyclic olefin may be 50 mol% or less (more desirably 15 to 50 mol%). In particular, in the case of using a terpolymer of a cyclic olefin, a chain olefin, and an aromatic compound having a vinyl group, the monomer unit composed of the cyclic olefin may be less than the above. In such a terpolymer, a monomer unit composed of a chain olefin is usually 5 to 80 mol%, and a monomer unit having a vinyl aromatic compound is usually 5 to 80 mol%.

環烯烴系樹脂，可使用適合的市售品，例如Topas(Ticona公司製)、Arton(JSR公司製)、ZEONOR(日本ZEON股份有限公司製)、ZEONEX(日本ZEON股份有 限公司製)、APL(三井化學股份有限公司製)、OXIS(大倉工業公司製)等。如此的環烯烴系樹脂製膜成為薄膜時，適合使用溶劑鑄膜法、熔融擠出法等習知的方法。而且，例如可使用Escena(積水化學工業股份有限公司製)、SCA40(積水化學工業股份有限公司製)、ZEONOR薄膜(股份有限公司Optes製)等預先製膜之環烯烴系樹脂製的薄膜之市售品。 For the cycloolefin resin, a commercially available product such as Topas (manufactured by Ticona Co., Ltd.), Arton (manufactured by JSR Corporation), ZEONOR (manufactured by Nippon Zeon Co., Ltd.), and ZEONEX (Japan ZEON Co., Ltd.) can be used. Limited company system), APL (manufactured by Mitsui Chemicals, Inc.), OXIS (manufactured by Okura Industrial Co., Ltd.), etc. When a film of such a cycloolefin-based resin is used as a film, a conventional method such as a solvent casting method or a melt extrusion method is suitably used. In addition, for example, a film made of a film of a cycloolefin-based resin prepared in advance, such as a scenamel (manufactured by Sekisui Chemical Co., Ltd.), SCA40 (manufactured by Sekisui Chemical Co., Ltd.), or a ZEONOR film (manufactured by Optes), can be used. Sale.

環烯烴系樹脂薄膜，可為一軸延伸或二軸延伸者。藉由延伸，可賦予環烯烴系樹脂薄膜任意的相位差值。延伸通常係一邊捲出薄膜捲狀物，一邊連續地進行，於加熱爐朝捲狀物的行進方向(薄膜的長度方向)、與其行進方向垂直的方向(薄膜的寬度方向)或其兩者延伸。加熱爐的溫度，通常採用從環烯烴系樹脂薄膜的玻璃轉化溫度附近至玻璃轉化溫度+100℃的範圍。延伸倍率，通常為1.1至6倍，較理想為1.1至3.5倍。 The cycloolefin-based resin film may be one-axis extension or biaxial extension. By extending, it is possible to impart an arbitrary retardation value to the cycloolefin-based resin film. The stretching is generally performed while continuously winding up the film roll, and is extended in the heating furnace toward the traveling direction of the roll (the longitudinal direction of the film), the direction perpendicular to the traveling direction (the width direction of the film), or both. The temperature of the heating furnace is usually in the range from the vicinity of the glass transition temperature of the cycloolefin-based resin film to the glass transition temperature + 100 °C. The stretching ratio is usually 1.1 to 6 times, preferably 1.1 to 3.5 times.

當環烯烴系樹脂薄膜為捲繞的捲狀物的狀態時，因薄膜彼此接合而容易產生結塊的傾向，通常貼合保護膜後，捲成為捲狀物。而且，環烯烴系樹脂薄膜，因一般表面活性差，較理想為於與偏光膜接合的表面進行電漿處理、電暈處理、紫外線照射處理、火焰處理、皂化處理等表面處理。其中，適合為較容易實施之電漿處理，特別是大氣壓電漿處理、電暈處理。 When the cycloolefin-based resin film is in the state of a wound roll, the film tends to be agglomerated because it is joined to each other, and after the protective film is bonded, it is wound into a roll. Further, the cycloolefin-based resin film is preferably subjected to surface treatment such as plasma treatment, corona treatment, ultraviolet irradiation treatment, flame treatment, or saponification treatment on the surface joined to the polarizing film due to poor surface activity. Among them, it is suitable for plasma treatment which is easier to implement, especially atmospheric piezoelectric slurry treatment and corona treatment.

所謂乙酸纖維素系樹脂，係指纖維素的部分或完全酯化物，例如纖維素的乙酸酯、丙酸酯、丁酸酯、該些的混 合酯等所構成的薄膜。更具體地，例如三乙醯纖維素薄膜、二乙醯纖維素薄膜、纖維素乙酸酯丙酸酯薄膜、纖維素乙酸酯丁酸酯薄膜等。作為如此的纖維素酯系樹脂薄膜，可適合使用適宜的市售品，例如Fujitac TD80(富士薄膜股份有限公司製)、Fujitac TD80UF(富士薄膜股份有限公司製)、Fujitac TD80UZ(富士薄膜股份有限公司製)、KC8UX2M(柯尼卡美能達股份有限公司製)、KC8UY(柯尼卡美能達股份有限公司製)、Fujitac TD60UL(富士薄膜股份有限公司製)、KC4UYW(柯尼卡美能達股份有限公司製)、KC6UAW(柯尼卡美能達股份有限公司製)等。 The term "cellulose acetate resin" means a partial or complete esterified product of cellulose, such as cellulose acetate, propionate, butyrate, a mixture of these. A film composed of a conjugate or the like. More specifically, for example, a triacetonitrile cellulose film, a diethylcellulose film, a cellulose acetate propionate film, a cellulose acetate butyrate film, or the like. As such a cellulose ester-based resin film, a commercially available product such as Fujitac TD80 (manufactured by Fuji Film Co., Ltd.), Fujitac TD80UF (manufactured by Fuji Film Co., Ltd.), and Fujitac TD80UZ (Fuji Film Co., Ltd.) can be suitably used. System), KC8UX2M (manufactured by Konica Minolta Co., Ltd.), KC8UY (manufactured by Konica Minolta Co., Ltd.), Fujitac TD60UL (manufactured by Fuji Film Co., Ltd.), KC4UYW (Konica Minolta Co., Ltd.) System), KC6UAW (manufactured by Konica Minolta Co., Ltd.), etc.

而且，作為透明薄膜，賦予相位差之乙酸纖維素系樹脂薄膜也適合使用。如此的賦予相位差之乙酸纖維素系樹脂薄膜之市售品，例如WV BZ 438(富士軟片股份有限公司製)、KC4FR-1(柯尼卡美能達股份有限公司製)、KC4CR-1(柯尼卡美能達股份有限公司製)、KC4AR-1(柯尼卡美能達股份有限公司製)等。乙酸纖維素，亦稱為乙醯纖維素、纖維素乙酸酯。 Further, as the transparent film, a cellulose acetate-based resin film which imparts a phase difference is also suitably used. Commercial products such as WV BZ 438 (made by Fujifilm Co., Ltd.), KC4FR-1 (manufactured by Konica Minolta Co., Ltd.), KC4CR-1 (Ke) Nika Minolta Co., Ltd.), KC4AR-1 (manufactured by Konica Minolta Co., Ltd.), etc. Cellulose acetate, also known as acetaminophen, cellulose acetate.

該些乙酸纖維素系樹脂薄膜容易吸水，而有偏光板的水分比例影響偏光板的端部鬆弛的情況。製造偏光板時的水分比例，越接近偏光板的保存環境，例如潔淨室的製造產線、捲狀物的保存倉庫之平衡水分比例越好，雖也與積層薄膜的構成有關，例如為2.0至3.5%的程度，更理想為2.5%至3.0%。該偏光板的水分比例的數值係以乾燥重量法測定者，為105℃/120分鐘後的重量變化。 These cellulose acetate-based resin films are likely to absorb water, and the moisture ratio of the polarizing plate affects the relaxation of the end portions of the polarizing plates. The ratio of the water content when manufacturing the polarizing plate is closer to the storage environment of the polarizing plate. For example, the ratio of the equilibrium moisture content of the manufacturing line of the clean room and the storage warehouse of the roll is better, although it is related to the composition of the laminated film, for example, 2.0 to The level of 3.5% is more preferably 2.5% to 3.0%. The numerical value of the moisture ratio of the polarizing plate was measured by the dry weight method and was a change in weight after 105 ° C / 120 minutes.

本發明的偏光板所使用的透明薄膜的厚度，較理想為薄者，太薄時強度降低，加工性變差。另一方面，太厚時，產生透明性降低、積層後所需的固化時間變長等的問題。因此，透明薄膜的適當厚度，例如為5至200μm，較理想為10至150μm，更理想為10至100μm。 The thickness of the transparent film used in the polarizing plate of the present invention is preferably thin, and when it is too thin, the strength is lowered and the workability is deteriorated. On the other hand, when it is too thick, there arises a problem that the transparency is lowered, and the curing time required after lamination is lengthened. Therefore, a suitable thickness of the transparent film is, for example, 5 to 200 μm, more preferably 10 to 150 μm, still more preferably 10 to 100 μm.

為了提高接合劑與偏光膜及/或透明薄膜的接合性，於偏光膜及/或透明薄膜，可實施電暈處理、火焰處理、電漿處理、紫外線處理、底塗(primer)塗佈處理、皂化處理等的表面改質處理。 In order to improve the bonding property between the bonding agent and the polarizing film and/or the transparent film, the polarizing film and/or the transparent film may be subjected to corona treatment, flame treatment, plasma treatment, ultraviolet treatment, primer coating treatment, Surface modification treatment such as saponification treatment.

而且，對於透明薄膜中，可各別單獨或2種以上組合實施抗眩光處理、抗反射處理、硬塗處理、帶電防止處理、抗污處理等表面處理。而且，透明薄膜及/或透明薄膜表面保護層，亦可含有二苯基酮系化合物、苯并***系化合物等紫外線吸收劑、苯基磷酸酯系化合物、鄰苯二甲酸酯系化合物等塑化劑。 Further, in the transparent film, surface treatment such as anti-glare treatment, anti-reflection treatment, hard coating treatment, electrification prevention treatment, and anti-stain treatment may be carried out alone or in combination of two or more kinds. Further, the transparent film and/or the transparent film surface protective layer may contain a UV absorber such as a diphenylketone compound or a benzotriazole compound, a phenyl phosphate compound, or a phthalate compound. Plasticizer.

再者，透明薄膜可具有作為相位差膜的功能、作為增亮膜的功能、作為反射膜的功能、作為半透過反射膜的功能、作為擴散膜的功能、作為光學補償膜的功能等之光學功能。於該情況，例如藉由於透明薄膜的表面，積層相位差膜、增亮膜、反射膜、半透過反射膜、擴散膜、光學補償膜等光學功能性薄膜，除了可具有如此的功能外，也可賦予透明薄膜自體如此的功能。而且，透明薄膜可具有如具有作為增亮膜的功能的擴散膜等複數功能。 Further, the transparent film may have a function as a retardation film, a function as a brightness enhancement film, a function as a reflection film, a function as a semi-transmissive reflection film, a function as a diffusion film, and a function as an optical compensation film. Features. In this case, for example, by the surface of the transparent film, an optical functional film such as a laminated retardation film, a brightness enhancement film, a reflective film, a semi-transmissive reflection film, a diffusion film, or an optical compensation film may have such a function. It can impart such a function to the transparent film itself. Further, the transparent film may have a plurality of functions such as a diffusion film having a function as a brightness enhancement film.

例如，於上述透明薄膜，實施日本專利第2841377號 公報、日本專利第3094113號公報等記載之延伸處理，藉由實施日本專利第3168850號公報記載之處理，可賦予作為相位差膜的功能。相位差膜之相位差特性，例如可適當選擇正面相位差值為5至100 nm，厚度方向相位差值為40至300 nm的範圍等。而且，於上述透明薄膜，以如日本特開2002-169025號公報或特開2003-29030號公報記載之方法，藉由形成細微孔，或者是藉由重疊選擇反射的中心波長相異的2層以上的膽固醇液晶層，可賦予作為增亮膜的功能。 For example, in the above transparent film, Japanese Patent No. 2841377 is implemented. In the extension process described in Japanese Patent No. 3094113, the process described in Japanese Patent No. 3168850 can be used to impart a function as a retardation film. The phase difference characteristic of the retardation film can be, for example, a range in which the front phase difference value is 5 to 100 nm, and the thickness direction retardation value is 40 to 300 nm. Further, in the above-mentioned transparent film, a micropore is formed by a method as described in JP-A-2002-169025 or JP-A-2003-29030, or a center wavelength of the reflection is selected by overlapping. The cholesteric liquid crystal layer above the layer can impart a function as a brightness enhancement film.

於上述透明薄膜中，若以蒸鍍或濺鍍等形成金屬薄膜，則可賦予作為反射膜或半透過反射膜的功能。於上述透明薄膜中，藉由塗佈包含微粒子之樹脂溶液，可賦予作為擴散膜之功能。而且，於上述透明薄膜，可藉由塗佈盤形液晶性化合物等的液晶性化合物，使其配向，賦予作為光學補償膜的功能。而且，於透明薄膜，可含有發現相位差的化合物。再者，可使用適當的接合劑，直接貼合各種光學功能性薄膜於偏光膜。作為光學功能性薄膜的市售品，例如DBEF(3M公司製、可從住友3M股份有限公司取得)等增亮膜、WV film(富士軟片股份有限公司製)等視角改良薄膜、Arton film(JSR股份有限公司製)、ZEONOR薄膜(股份有限公司Optes製)、Escena(積水化學工業股份有限公司製)、VA-TAC(柯尼卡美能達股份有限公司製)、SUMICALITE(住友化學股份有限公司製)等的相位差膜等。 In the transparent film, when a metal thin film is formed by vapor deposition, sputtering, or the like, a function as a reflective film or a semi-transmissive reflective film can be imparted. In the above transparent film, by applying a resin solution containing fine particles, it is possible to impart a function as a diffusion film. In addition, the transparent film can be aligned by applying a liquid crystal compound such as a disk-shaped liquid crystal compound to impart an optical compensation film. Further, in the transparent film, a compound having a phase difference can be found. Further, various optical functional films can be directly bonded to the polarizing film by using a suitable bonding agent. A commercially available product of an optical functional film, such as a brightness enhancement film such as DBEF (available from Sumitomo 3M Co., Ltd., manufactured by Sumitomo 3M Co., Ltd.), a viewing angle improving film such as WV film (made by Fujifilm Co., Ltd.), and Arton film (JSR) Co., Ltd.), ZEONOR film (manufactured by Optes, Inc.), Escena (manufactured by Sekisui Chemical Co., Ltd.), VA-TAC (manufactured by Konica Minolta Co., Ltd.), SUMICALITE (manufactured by Sumitomo Chemical Co., Ltd.) a retardation film or the like.

(活性能量線硬化型接合劑) (active energy ray hardening type bonding agent)

偏光膜與透明薄膜，係透過活性能量線硬化型接合劑而貼合。作為活性能量線硬化型接合劑，從耐候性、折射率、陽離子聚合性等的觀點，例如含有藉由活性能量線的照射會硬化之環氧樹脂的環氧系樹脂組成物所構成的接合劑。但是，不限於該些，可採用傳統偏光板製造使用的各種活性能量線硬化型接合劑(有機溶劑系接合劑、熱融化系接合劑、無溶劑型接合劑等)，例如丙烯醯胺、丙烯酸酯、胺甲酸乙酯丙烯酸酯、環氧丙烯酸酯等丙烯酸系樹脂組成物所構成的接合劑。 The polarizing film and the transparent film are bonded together by an active energy ray-curable bonding agent. The active energy ray-curable bonding agent is an adhesive composed of an epoxy resin composition containing an epoxy resin which is cured by irradiation with an active energy ray, from the viewpoints of weather resistance, refractive index, and cationic polymerizability. . However, the present invention is not limited thereto, and various active energy ray-curable bonding agents (organic solvent-based bonding agents, hot-melt-based bonding agents, solventless bonding agents, and the like) used for manufacturing conventional polarizing plates, such as acrylamide, acrylic acid, may be used. A bonding agent composed of an acrylic resin composition such as an ester, urethane acrylate or epoxy acrylate.

所謂環氧樹脂，係指分子內具有2個以上的環氧基之化合物。從耐候性、折射率、陽離子聚合性等的觀點，作為接合劑之硬化性環氧樹脂組成物所含有的環氧樹脂，較理想為分子內不包含芳香環的環氧樹脂(例如參考專利文獻1)。作為如此的環氧樹脂，可例如為氫化環氧樹脂、脂環式環氧樹脂、脂肪族環氧樹脂等。 The epoxy resin refers to a compound having two or more epoxy groups in the molecule. From the viewpoints of weather resistance, refractive index, cationic polymerizability, and the like, the epoxy resin contained in the curable epoxy resin composition as the bonding agent is preferably an epoxy resin containing no aromatic ring in the molecule (for example, refer to the patent literature) 1). As such an epoxy resin, a hydrogenated epoxy resin, an alicyclic epoxy resin, an aliphatic epoxy resin, etc. are mentioned, for example.

氫化環氧樹脂係可藉由將作為芳香族環氧樹脂的原料之聚羥基化合物在觸媒的存在下，藉由加壓下選擇性地進行核氫化反應所得之核氫化聚羥基化合物環氧丙基醚化的方法而得到。作為芳香族環氧樹脂，例如雙酚A的二環氧丙基醚、雙酚F的二環氧丙基醚以及雙酚S的二環氧丙基醚等的雙酚型環氧樹脂；酚酚醛樹脂(novolak)環氧樹脂、甲酚酚醛樹脂環氧樹脂以及羥基苯甲醛酚酚醛樹脂環氧樹脂等酚醛樹脂型環氧樹脂；四羥基苯基甲烷的環氧丙基 醚、四羥基二苯基酮的環氧丙基醚以及環氧化聚乙烯基酚等多官能基型環氧樹脂等。氫化環氧樹脂中，較理想為氫化雙酚A的環氧丙基醚。 The hydrogenated epoxy resin is a nuclear hydrogenated polyhydroxy compound propylene-propylene obtained by selectively performing a nuclear hydrogenation reaction under pressure by using a polyhydroxy compound as a raw material of an aromatic epoxy resin in the presence of a catalyst. Obtained by the method of etherification. Examples of the aromatic epoxy resin include a bisphenol epoxy resin such as diglycidyl ether of bisphenol A, diglycidyl ether of bisphenol F, and diepoxypropyl ether of bisphenol S; Phenolic resin type epoxy resin such as novolak epoxy resin, cresol novolac resin epoxy resin, and hydroxybenzaldehyde phenol novolac resin epoxy resin; epoxypropyl group of tetrahydroxyphenylmethane A polyfunctional epoxy resin such as an ether, a glycidyl ether of tetrahydroxydiphenyl ketone or an epoxidized polyvinyl phenol. Among the hydrogenated epoxy resins, a glycidyl ether of hydrogenated bisphenol A is preferred.

所謂脂環式環氧樹脂，係指分子內具有1個以上鍵結於脂環式環之環氧基的環氧樹脂。所謂「鍵結於脂環式環之環氧基」，係指下式所示的構造之橋接的氧原子-O-。下式中，m為2至5的整數。 The alicyclic epoxy resin refers to an epoxy resin having one or more epoxy groups bonded to an alicyclic ring in the molecule. The "epoxy group bonded to the alicyclic ring" means a bridged oxygen atom -O- of the structure shown by the following formula. In the following formula, m is an integer of 2 to 5.

除去上述式之(CH₂)_m中1個或複數個氫原子的形態之基鍵結於其他化學構造之化合物，可成為脂環式環氧樹脂。上述式之(CH₂)_m中1個或複數個氫原子，可適當地被甲基、乙基等直鏈狀烷基取代。脂環式環氧樹脂中，由於顯示良好的接合性，較理想為使用具有氧雜二環己烷環(上述式m=3者)之環氧樹脂、具有氧雜二環庚烷環(上述式m=4者)之環氧樹脂。以下，具體地例示較理想使用的脂環式環氧樹脂，但不限於該些化合物。 The group in which the form of one or a plurality of hydrogen atoms in the above formula (CH ₂ ) _m is bonded to a compound having another chemical structure can be an alicyclic epoxy resin. One or a plurality of hydrogen atoms in the above formula (CH ₂ ) _m may be appropriately substituted with a linear alkyl group such as a methyl group or an ethyl group. In the alicyclic epoxy resin, since it exhibits good adhesion, it is preferred to use an epoxy resin having an oxabicyclohexane ring (the above formula m=3) and an oxabicycloheptane ring (described above). Epoxy resin of the formula m=4). Hereinafter, the alicyclic epoxy resin which is preferably used is specifically exemplified, but is not limited to these compounds.

(a)下式(I)所示的環氧基環己烷羧酸環氧基環己基甲酯類： (a) Epoxycyclohexanecarboxylic acid epoxycyclohexyl methyl ester represented by the following formula (I):

(式中，R¹及R²互相獨立表示氫原子或碳數1至5之 直鏈狀烷基)。 (wherein R ¹ and R ² independently of each other represent a hydrogen atom or a linear alkyl group having 1 to 5 carbon atoms).

(b)下式(II)所示的烷二醇的環氧基環己烷羧酸酯類： (b) an epoxycyclohexanecarboxylic acid ester of an alkanediol represented by the following formula (II):

(式中，R³及R⁴互相獨立表示氫原子或碳數1至5之直鏈狀烷基，n表示2至20的整數)。 (wherein R ³ and R ⁴ independently of each other represent a hydrogen atom or a linear alkyl group having 1 to 5 carbon atoms, and n represents an integer of 2 to 20).

(c)下式(III)所示的二羧酸的環氧基環己基甲酯類： (c) Epoxycyclohexylmethyl esters of dicarboxylic acids represented by the following formula (III):

(式中，R⁵及R⁶互相獨立表示氫原子或碳數1至5之直鏈狀烷基，p表示2至20的整數)。 (wherein R ⁵ and R ⁶ each independently represent a hydrogen atom or a linear alkyl group having 1 to 5 carbon atoms, and p represents an integer of 2 to 20).

(d)下式(IV)所示的聚乙二醇的環氧基環己基甲醚類： (d) Epoxycyclohexyl methyl ether of polyethylene glycol represented by the following formula (IV):

(式中，R⁷及R⁸互相獨立表示氫原子或碳數1至5之直鏈狀烷基，q表示2至10的整數)。 (wherein R ⁷ and R ⁸ each independently represent a hydrogen atom or a linear alkyl group having 1 to 5 carbon atoms, and q represents an integer of 2 to 10).

(e)下式(V)所示的烷二醇的環氧基環己基甲醚類： (e) an epoxycyclohexyl methyl ether of an alkanediol represented by the following formula (V):

(式中，R⁹及R¹⁰互相獨立表示氫原子或碳數1至5之直鏈狀烷基，r表示2至20的整數)。 (wherein R ⁹ and R ¹⁰ independently of each other represent a hydrogen atom or a linear alkyl group having 1 to 5 carbon atoms, and r represents an integer of 2 to 20).

(f)下式(VI)所示的二環氧基三螺環化合物類： (f) a dicyclooxytrispirocyclic compound represented by the following formula (VI):

(式中，R¹¹及R¹²互相獨立表示氫原子或碳數1至5之直鏈狀烷基)。 (wherein R ¹¹ and R ¹² each independently represent a hydrogen atom or a linear alkyl group having 1 to 5 carbon atoms).

(g)下式(VII)所示的二環氧基單螺環化合物類： (g) a dicyclooxymonospirocyclic compound represented by the following formula (VII):

(式中，R¹³及R¹⁴互相獨立表示氫原子或碳數1至5之直鏈狀烷基)。 (wherein R ¹³ and R ¹⁴ independently of each other represent a hydrogen atom or a linear alkyl group having 1 to 5 carbon atoms).

(h)下式(VIII)所示的乙烯基環己烯二環氧化物類： (h) a vinylcyclohexene diepoxide represented by the following formula (VIII):

(式中，R¹⁵表示氫原子或碳數1至5之直鏈狀烷基)。 (wherein R ¹⁵ represents a hydrogen atom or a linear alkyl group having 1 to 5 carbon atoms).

(i)下式(IX)所示的環氧基戊基醚類： (i) Epoxypentyl ethers of the following formula (IX):

(式中，R¹⁶及R¹⁷互相獨立表示氫原子或碳數1至5之直鏈狀烷基)。 (wherein R ¹⁶ and R ¹⁷ independently of each other represent a hydrogen atom or a linear alkyl group having 1 to 5 carbon atoms).

(j)下式(X)所示的二環氧基三環癸烷類： (j) a dicyclooxytricyclodecane represented by the following formula (X):

(式中，R¹⁸表示氫原子或碳數1至5之直鏈狀烷基)。 (wherein R ¹⁸ represents a hydrogen atom or a linear alkyl group having 1 to 5 carbon atoms).

上述例示的脂環式環氧樹脂中，以下的脂環式環氧樹脂，有市售品或其類似物，因取得較容易等的理由，使用該些較理想。 Among the alicyclic epoxy resins exemplified above, the following alicyclic epoxy resins are commercially available or the like, and it is preferred to use them for reasons such as ease of use.

(A)7-氧雜雙環[4.1.0]庚烷-3-羧酸與(7-氧雜雙環[4.1.0]庚-3-基)甲醇的酯化物〔於式(I)，R¹=R²=H的化合物〕；(B)4-甲基-7-氧雜雙環[4.1.0]庚烷-3-羧酸與(4-甲基-7-氧雜雙環[4.1.0]庚-3-基)甲醇的酯化物〔於式(I)，R¹=4-CH₃、R²=4-CH₃的化合物〕；(C)7-氧雜雙環[4.1.0]庚烷-3-羧酸與1,2-乙二醇的酯化物〔於式(II)，R³=R⁴=H、n=2的化合物〕；(D)(7-氧雜雙環[4.1.0]庚-3-基)甲醇與己二酸的酯化物〔於式(III)，R⁵=R⁶=H、p=4的化合物〕；(E)(4-甲基-7-氧雜雙環[4.1.0]庚-3-基)甲醇與己 二酸的酯化物〔於式(III)，R⁵=4-CH₃、R⁶=4-CH₃、p=4的化合物〕；(F)(7-氧雜雙環[4.1.0]庚-3-基)甲醇與1,2-乙二醇的醚化物〔於式(V)，R⁹=R¹⁰=H、r=2的化合物〕。 (A) an ester of 7-oxabicyclo[4.1.0]heptane-3-carboxylic acid with (7-oxabicyclo[4.1.0]heptan-3-yl)methanol [in formula (I), R ¹ =R ² =H compound]; (B) 4-methyl-7-oxabicyclo[4.1.0]heptane-3-carboxylic acid and (4-methyl-7-oxabicyclo[4.1. An esterified product of 0]hept-3-yl)methanol [Compound of formula (I), R ¹ =4-CH ₃ , R ² =4-CH ₃ ]; (C) 7-oxabicyclo[4.1.0 An esterified product of heptane-3-carboxylic acid and 1,2-ethanediol [a compound of formula (II), R ³ = R ⁴ = H, n = 2); (D) (7-oxabicyclo) [4.1.0]Hept-3-yl) esterified product of methanol with adipic acid [Compound of formula (III), R ⁵ =R ⁶ =H, p=4]; (E)(4-methyl- An ester of 7-oxabicyclo[4.1.0]heptan-3-yl)methanol with adipic acid [in formula (III), R ⁵ =4-CH ₃ , R ⁶ =4-CH ₃ , p=4 a compound of (F)(7-oxabicyclo[4.1.0]heptan-3-yl)methanol and 1,2-ethanediol [in formula (V), R ⁹ =R ¹⁰ =H , compound of r=2].

而且，作為脂肪族環氧樹脂，可例如脂肪族多價醇或其環氧烷烴(alkylene oxide)加成物的聚環氧丙基醚。更具體地，例如1,4-丁二醇的二環氧丙基醚；1,6-己二醇的二環氧丙基醚；丙三醇的三環氧丙基醚；三羥基丙烷的三環氧丙基醚；聚乙二醇的二環氧丙基醚；丙二醇的二環氧丙基醚；於乙二醇、丙二醇及丙三醇等脂肪族多價醇，藉由加成1種或2種以上的環氧烷烴(環氧乙烷、環氧丙烷)所得之聚醚多元醇的聚環氧丙基醚等。 Further, as the aliphatic epoxy resin, for example, a polyepoxypropyl ether of an aliphatic polyvalent alcohol or an alkylene oxide adduct thereof can be used. More specifically, for example, diepoxypropyl ether of 1,4-butanediol; diepoxypropyl ether of 1,6-hexanediol; triepoxypropyl ether of glycerol; trihydroxypropane Triepoxypropyl ether; diepoxypropyl ether of polyethylene glycol; diepoxypropyl ether of propylene glycol; aliphatic polyvalent alcohol such as ethylene glycol, propylene glycol and glycerol, by addition 1 A polyepoxy propyl ether of a polyether polyol obtained by using two or more kinds of alkylene oxides (ethylene oxide or propylene oxide).

構成由環氧系樹脂組成物所成的接合劑之環氧樹脂，可只單獨使用1種，亦可併用2種以上。該組成物所使用的環氧樹脂的環氧當量，通常為30至3,000 g/當量，較理想為50至1,500 g/當量的範圍內。環氧當量低於30g/當量時，有硬化後的複合偏光板的可撓性低，接合強度低之可能性。另一方面，超過3,000 g/當量時，有與含於接合劑之其他成分的相溶性低之可能性。 The epoxy resin constituting the bonding agent of the epoxy resin composition may be used alone or in combination of two or more. The epoxy equivalent of the epoxy resin used in the composition is usually from 30 to 3,000 g/equivalent, more preferably from 50 to 1,500 g/equivalent. When the epoxy equivalent is less than 30 g/equivalent, the composite polarizing plate after curing has low flexibility and low joint strength. On the other hand, when it exceeds 3,000 g/eq, there is a possibility that the compatibility with other components contained in the binder is low.

於該接合劑，從反應性的觀點，作為環氧樹脂的硬化反應，較理想為使用陽離子聚合。因此，作為活性能量線硬化型的接合劑之硬化性環氧樹脂，較理想為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、電子線等的活性能量線之照射，產生陽離子物種 或路易士酸，引發環氧基的聚合反應。以下，將藉由活性能量線之照射而產生陽離子物種或路易士酸，引發環氧基的聚合反應之陽離子聚合起始劑，稱為「光陽離子聚合起始劑」。 In the binder, from the viewpoint of reactivity, it is preferred to use cationic polymerization as a curing reaction of the epoxy resin. Therefore, as the curable epoxy resin of the active energy ray-curable bonding agent, it is preferred to formulate a cationic polymerization initiator. The cationic polymerization initiator is irradiated with active energy rays such as visible light, ultraviolet rays, X-rays, electron beams, etc. to generate cationic species. Or Lewis acid, which initiates the polymerization of epoxy groups. Hereinafter, a cationic polymerization initiator which generates a cationic species or Lewis acid by irradiation with an active energy ray and initiates polymerization of an epoxy group is referred to as a "photocationic polymerization initiator".

使用光陽離子聚合起始劑，藉由活性能量線之照射而進行接合劑的硬化之方法，係在可在常溫下硬化，減少考慮偏光膜的耐熱性或因膨脹之彎曲之必要，在薄膜間可良好地接合之點有利。而且，光陽離子聚合起始劑係因光而進行觸媒作用，即使混合於環氧樹脂，其保存安定性與操作性仍佳。 The method of curing the bonding agent by irradiation with an active energy ray using a photocationic polymerization initiator is to be hardened at room temperature, and it is necessary to reduce the heat resistance of the polarizing film or the bending due to expansion, between the films. The point of good bonding is advantageous. Further, the photocationic polymerization initiator is subjected to a catalytic action by light, and even if it is mixed with an epoxy resin, its storage stability and workability are good.

作為光陽離子聚合起始劑，例如芳香族重氮鹽；芳香族錪鹽、芳香族鋶鹽等的鎓鹽；鐵-芳烴(iron-arene)錯合物等。 Examples of the photocationic polymerization initiator include an aromatic diazonium salt; an onium salt such as an aromatic onium salt or an aromatic onium salt; and an iron-arene complex.

作為芳香族重氮鹽，例如六氟銻酸苯重氮鹽、六氟磷酸苯重氮鹽、六氟硼酸苯重氮鹽等。而且，作為芳香族錪鹽，例如肆(五氟苯基)硼酸二苯基錪鹽、六氟磷酸二苯基錪鹽、六氟銻酸二苯基錪鹽、六氟磷酸二(4-壬基苯基)錪鹽等。 Examples of the aromatic diazonium salt include benzene diazonium hexafluoroantimonate, benzene diazonium hexafluorophosphate, and benzene diazonium hexafluoroborate. Further, as the aromatic phosphonium salt, for example, diphenylsulfonium sulfonium (pentafluorophenyl)borate, diphenylsulfonium hexafluorophosphate, diphenylphosphonium hexafluoroantimonate, and di(4-anthracene hexafluorophosphate) Base phenyl) sulfonium salt and the like.

作為芳香族鋶鹽，例如六氟磷酸三苯基鋶鹽、六氟銻酸三苯基鋶鹽、四(五氟苯基)硼酸三苯基鋶鹽、雙(六氟磷酸)4,4’-雙(二苯基鋶)二苯硫醚、雙(六氟銻酸)4,4’-雙[二(β-羥基乙氧基)苯基鋶]二苯硫醚、雙(六氟磷酸)4,4’-雙[二(β-羥基乙氧基)苯基鋶]二苯硫醚、六氟銻酸7-[二(對-甲苯基)鋶]-2-異丙基硫雜蒽酮 (thioxanthone)、四(五氟苯基)硼酸7-[二(對-甲苯基)鋶]-2-異丙基硫雜蒽酮、六氟磷酸4-苯基羰基-4’-二苯基鋶-二苯硫醚、六氟銻酸4-(對-第3丁基苯基羰基)-4’-二苯基鋶-二苯硫醚、四(五氟苯基)硼酸4-(對-第三丁基苯基羰基)-4’-二(對-甲苯基)鋶-二苯硫醚等。 As the aromatic phosphonium salt, for example, triphenylsulfonium hexafluorophosphate, triphenylsulfonium hexafluoroantimonate, triphenylsulfonium tetrakis(pentafluorophenyl)borate, bis(hexafluorophosphate) 4,4' - bis(diphenylfluorene)diphenyl sulfide, bis(hexafluoroantimonate) 4,4'-bis[bis(?-hydroxyethoxy)phenylhydrazine]diphenyl sulfide, bis(hexafluorophosphate) 4,4'-bis[bis(β-hydroxyethoxy)phenylhydrazine]diphenyl sulfide, hexafluoroantimonic acid 7-[bis(p-tolyl)purine]-2-isopropylsulfan Anthrone (thioxanthone), tetrakis(pentafluorophenyl)borate 7-[bis(p-tolyl)purine]-2-isopropylthioxanthone, 4-phenylcarbonyl-4'-diphenyl hexafluorophosphate鋶-diphenyl sulfide, hexafluoroantimonate 4-(p-butylphenylcarbonyl)-4'-diphenylanthracene-diphenyl sulfide, tetrakis(pentafluorophenyl)borate 4-(pair -T-butylphenylcarbonyl)-4'-bis(p-tolyl)indole-diphenyl sulfide.

而且，作為鐵-芳烴錯合物，例如六氟銻酸二甲苯-環戊二烯鐵(II)、六氟磷酸異丙苯-環戊二烯鐵(II)、二甲苯-環戊二烯鐵(II)-三(三氟甲基磺醯基)甲基化物(xylene-cyclopentadienyliron(II)tris(trifluoromethylsulfonyl)methanide)等。 Moreover, as an iron-aromatic complex, for example, xylene hexafluoroantimony-cyclopentadienyl iron (II), cumene hexafluoro-cyclopentadienyl iron (II), xylene-cyclopentadiene Iron (II)-tris(trifluoromethylsulfonyl)methide (xylene-cyclopentadienyliron(II) tris(trifluoromethylsulfonyl)methanide).

該些光陽離子聚合起始劑的市售品，可容易取得，以分別的商品名，例如「KAYALITE PCI-220」以及「KAYALITE PCI-620」(以上係日本化藥股份有限公司製)、「UVI-6990」(聯合碳化物公司製)、「ADEKA OPTOMER SP-150」以及「ADEKA OPTOMER SP-170」(以上係ADEKA公司製)、「CI-5102」、「CIT-1370」、「CIT-1682」、「CIP-1866S」、「CIP-2048S」以及「CIP-2064S」(以上係日本曹達股份有限公司製)、「DPI-101」、「DPI-102」、「DPI-103」、「DPI-105」、「MPI-103」、「MPI-105」、「BBI-101」、「BBI-102」、「BBI-103」、「BBI-105」、「TPS-101」、「TPS-102」、「TPS-103」、「TPS-105」、「MDS-103」、「MDS-105」、「DTS-102」以及「DTS-103」(以上係綠化學股份有限公司製)、「PI-2074」(Rhodia公司製)等。 Commercially available products of the photocationic polymerization initiators can be easily obtained, and the respective product names, for example, "KAYALITE PCI-220" and "KAYALITE PCI-620" (the above are manufactured by Nippon Kayaku Co., Ltd.), " UVI-6990" (made by Union Carbide), "ADEKA OPTOMER SP-150", and "ADEKA OPTOMER SP-170" (above ADEKA), "CI-5102", "CIT-1370", "CIT- 1682", "CIP-1866S", "CIP-2048S" and "CIP-2064S" (above is made by Japan Soda Co., Ltd.), "DPI-101", "DPI-102", "DPI-103", " DPI-105", "MPI-103", "MPI-105", "BBI-101", "BBI-102", "BBI-103", "BBI-105", "TPS-101", "TPS-" 102", "TPS-103", "TPS-105", "MDS-103", "MDS-105", "DTS-102" and "DTS-103" (above), "Green Chemical Co., Ltd.", " PI-2074" (made by Rhodia Corporation).

光陽離子聚合起始劑，可單獨只使用1種，亦可混合 2種以上使用。其中，使用芳香族鋶鹽，由於具有300 nm以上的波長區域之紫外線吸收特性，硬化性佳，因可賦予具有良好的機械強度、接合強度之硬化物，所以較理想。 Photocationic polymerization initiator, which can be used alone or in combination Two or more types are used. Among them, the aromatic sulfonium salt is preferred because it has ultraviolet light absorbing properties in a wavelength region of 300 nm or more and has excellent hardenability and can provide a cured product having good mechanical strength and joint strength.

光陽離子聚合起始劑的調配量，對環氧樹脂100重量份而言，通常為0.5至20重量份，較理想為1重量份以上，而且較理想為15重量份以下。光陽離子聚合起始劑的調配量，對環氧樹脂100重量份而言，低於0.5重量份時，硬化變得不充分，有機械強度、接合強度降低之傾向。而且，光陽離子聚合起始劑的調配量，對環氧樹脂100重量份而言，超過20重量份時，因硬化物中離子性物質增加，硬化物的吸濕性變高，耐久性能有降低的可能性。 The amount of the photocationic polymerization initiator to be added is usually 0.5 to 20 parts by weight, more preferably 1 part by weight or more, and more preferably 15 parts by weight or less, based on 100 parts by weight of the epoxy resin. When the amount of the photo-cationic polymerization initiator is less than 0.5 part by weight based on 100 parts by weight of the epoxy resin, the curing is insufficient, and the mechanical strength and the joint strength tend to be lowered. In addition, when the amount of the photocationic polymerization initiator is more than 20 parts by weight based on 100 parts by weight of the epoxy resin, the ionic substance in the cured product increases, the hygroscopic property of the cured product becomes high, and the durability is lowered. The possibility.

於使用光陽離子聚合起始劑的情況，硬化性環氧樹脂組成物，依據需要，可復含有光增感劑。藉由使用光增感劑，可提高陽離子聚合的反應性，提高硬化物的機械強度與接合強度。作為光增感劑，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、偶氮及重氮化合物、鹵化物、光還原性色素等。 In the case of using a photocationic polymerization initiator, the curable epoxy resin composition may further contain a photosensitizer as needed. By using a photosensitizer, the reactivity of cationic polymerization can be improved, and the mechanical strength and joint strength of the cured product can be improved. Examples of the photosensitizer include a carbonyl compound, an organic sulfur compound, a persulfide compound, a redox compound, an azo and a diazo compound, a halide, a photoreducible dye, and the like.

光增感劑的更具體例，例如安息香甲醚、安息香異丙醚及α,α-二甲氧基-α-苯基苯乙酮等安息香衍生物；二苯基酮、2,4-二氯二苯基酮、o-安息香基安息香酸甲酯、4,4’-雙(二甲基胺基)二苯基酮及4,4’-雙(二乙基胺基)二苯基酮等二苯基酮衍生物；2-氯硫雜蒽酮及2-異丙基硫雜蒽酮等硫雜蒽酮衍生物；2-氯蒽醌及2-甲基蒽醌等蒽醌衍生物；N-甲基吖啶酮及N-丁基吖啶酮等吖啶酮衍生物； 其他α,α-二乙氧基苯乙酮、二苯乙二酮、茀酮(Fluorenone)、氧雜蒽酮(Xanthone)、鈾化合物、鹵化物等。光增感劑，可單獨只使用1種，亦可併用2種以上。光增感劑，於硬化性環氧樹脂組成物100重量份中，含有0.1至20重量份的範圍內較理想。 More specific examples of the photosensitizer, such as benzoin methyl ether, benzoin isopropyl ether, and benzoin derivatives such as α,α-dimethoxy-α-phenylacetophenone; diphenyl ketone, 2,4-di Chlorodiphenyl ketone, o-benzoin benzoic acid methyl ester, 4,4'-bis(dimethylamino)diphenyl ketone and 4,4'-bis(diethylamino)diphenyl ketone Iso-diphenyl ketone derivatives; thioxanthone derivatives such as 2-chlorothiazinone and 2-isopropylthioxanthone; anthracene derivatives such as 2-chloroindole and 2-methylindole ; acridinone derivatives such as N-methylacridone and N-butylacridone; Other α,α-diethoxyacetophenone, diphenylethylenedione, Fluorenone, Xanthone, uranium compound, halide, and the like. The light sensitizer may be used alone or in combination of two or more. The light sensitizer is preferably contained in an amount of 0.1 to 20 parts by weight based on 100 parts by weight of the curable epoxy resin composition.

含於接合劑之環氧樹脂，因光陽離子聚合而硬化，亦可藉由光陽離子聚合以及熱陽離子聚合而硬化。於後者的情況，併用光陽離子聚合起始劑及熱陽離子聚合起始劑較理想。 The epoxy resin contained in the bonding agent is hardened by photocationic polymerization, and can be hardened by photocationic polymerization and thermal cationic polymerization. In the latter case, it is preferred to use a photocationic polymerization initiator and a thermal cationic polymerization initiator.

作為熱陽離子聚合起始劑，例如苯甲基鋶鹽、噻吩鹽(thiophenium)、四氫噻吩鹽(thiolanium)、苯甲基銨、吡啶鹽、聯胺鹽(hydrazinium)、羧酸酯、磺酸酯、胺醯亞胺等。該些熱陽離子聚合起始劑，作為市售品可容易取得，以分別的商品名，例如「Adeka opton CP77」及「Adeka opton CP66」(以上Adeka公司製)、「CI-2639」及「CI-2624」(以上曹達公司製)、「Sunaid SI-60L」、「Sunaid SI-80L」及「Sunaid SI-100L」(以上三新化學工業公司製)等。 As a thermal cationic polymerization initiator, for example, benzyl sulfonium salt, thiophenium salt, thiolanium salt, benzylammonium salt, pyridinium salt, hydrazinium, carboxylic acid ester, sulfonic acid Ester, amidoximine, and the like. These thermal cationic polymerization initiators are easily available as commercial products, and are respectively sold under the trade names of "Adeka opton CP77" and "Adeka opton CP66" (manufactured by Adeka Co., Ltd.), "CI-2639" and "CI". -2624" (manufactured by Soda Corporation), "Sunaid SI-60L", "Sunaid SI-80L" and "Sunaid SI-100L" (manufactured by Sanshin Chemical Industry Co., Ltd.).

活性能量線硬化型的接合劑，可復含有氧雜環丁烷類、多元醇類等促進陽離子聚合之化合物。 The active energy ray-curable bonding agent may contain a compound which promotes cationic polymerization such as oxetane or polyhydric alcohol.

氧雜環丁烷類為分子內具有4員環醚的化合物，例如3-乙基-3-羥基甲基氧雜環丁烷、1,4-雙[(3-乙基-3-氧雜環丁基)甲氧基甲基]苯、3-乙基-3-(苯氧基甲基)氧雜環丁烷、二[(3-乙基-3-氧雜環丁基)甲基]醚、3-乙基-3-(2-乙基己氧基甲基)氧雜環丁烷、酚酚醛樹脂氧雜環丁烷等。 該些氧雜環丁烷類，作為市售品可容易取得者，可舉例為以分別的商品名為「Aron oxetane OXT-101」、「Aron oxetane OXT-121」、「Aron oxetane OXT-211」、「Aron oxetane OXT-221」及「Aron oxetane OXT-212」(以上東亞合成股份有限公司製)者等。該些氧雜環丁烷類，在硬化性環氧樹脂組成物中，通常含有5至95重量%，較理想為30至70重量%的比例。 Oxetane is a compound having a 4-membered cyclic ether in the molecule, such as 3-ethyl-3-hydroxymethyloxetane, 1,4-bis[(3-ethyl-3-oxa) Cyclobutyl)methoxymethyl]benzene, 3-ethyl-3-(phenoxymethyl)oxetane, bis[(3-ethyl-3-oxetanyl)methyl An ether, 3-ethyl-3-(2-ethylhexyloxymethyl)oxetane, a phenol novolac oxetane or the like. These oxetanes are easily available as commercially available products, and can be exemplified by the trade names "Aron oxetane OXT-101", "Aron oxetane OXT-121", and "Aron oxetane OXT-211". "Aron oxetane OXT-221" and "Aron oxetane OXT-212" (manufactured by Toagosei Co., Ltd.). The oxetanes usually have a ratio of 5 to 95% by weight, preferably 30 to 70% by weight, based on the curable epoxy resin composition.

作為多元醇類，較理想為不存在酚性羥基以外的酸性基者，例如不具有羥基以外的官能基之多元醇化合物、聚酯多元醇化合物、聚己內酯多元醇化合物、具有酚性羥基之多元醇化合物、聚碳酸酯多元醇等。該些多元醇類的分子量，通常為48以上，較理想為62以上，更理想為100以上，而且較理想為1000以下。該些多元醇類，在硬化性環氧樹脂組成物中，通常含有50重量%以下，較理想為30重量%以下的比例。 The polyol is preferably an acid group other than a phenolic hydroxyl group, for example, a polyol compound having no functional group other than a hydroxyl group, a polyester polyol compound, a polycaprolactone polyol compound, and a phenolic hydroxyl group. Polyol compound, polycarbonate polyol, and the like. The molecular weight of these polyols is usually 48 or more, more preferably 62 or more, still more preferably 100 or more, and still more preferably 1,000 or less. These polyhydric alcohols usually contain 50% by weight or less, and more preferably 30% by weight or less, in the curable epoxy resin composition.

於活性能量線硬化型的接合劑，可再調配離子捕捉劑、抗氧化劑、鏈轉移劑、黏著賦予劑、熱塑性樹脂、填充劑、流動調整劑、整平劑、塑化劑、消泡劑等添加劑。作為離子捕捉劑，例如粉末狀的鉍系、銻系、鎂系、鋁系、鈣系、鈦系及該些混合系等的無機化合物，作為抗氧化劑，例如受阻酚系抗氧化劑等。 The active energy ray-curable bonding agent may be further formulated with an ion scavenger, an antioxidant, a chain transfer agent, an adhesion-imparting agent, a thermoplastic resin, a filler, a flow regulator, a leveling agent, a plasticizer, an antifoaming agent, etc. additive. Examples of the ion scavenger include inorganic compounds such as powdered lanthanoid, lanthanide, magnesium, aluminum, calcium, titanium, and such mixed systems, and examples of the antioxidant include a hindered phenol antioxidant.

於活性能量線硬化型的接合劑，可使用作為實質上不含有溶劑成分之無溶劑型接合劑，為了於各種塗佈方式為分別適合的黏度範圍，可含有溶劑，用以調整黏度。作為 溶劑，使用不降低偏光膜的光學特性、可良好地溶解環氧樹脂組成物者較理想，例如以甲苯為代表之烴類、以乙酸乙酯為代表之酯類等有機溶劑。本發明所使用的活性能量線硬化型的接合劑的黏度，例如為5至1000 mPa‧s的範圍，較理想為10至200 mPa‧s的範圍，更理想為20至100 mPa‧s的範圍。 As the active energy ray-curable bonding agent, a solventless bonding agent which does not substantially contain a solvent component can be used, and a solvent can be contained for adjusting the viscosity in order to have a suitable viscosity range for various coating methods. As The solvent is preferably an organic solvent such as a hydrocarbon represented by toluene or an ester represented by ethyl acetate, which is preferably used to dissolve the epoxy resin composition without lowering the optical characteristics of the polarizing film. The viscosity of the active energy ray-curing type bonding agent used in the present invention is, for example, in the range of 5 to 1000 mPa ‧ , more preferably in the range of 10 to 200 mPa ‧ s, more preferably in the range of 20 to 100 mPa ‧ s .

〈偏光板的製造方法〉 <Method of Manufacturing Polarizing Plate>

然後，一邊參考圖式，一邊說明本發明的偏光板之製造裝置及製造方法。第1圖為表示關於本發明的偏光板之製造裝置的一實施態樣的概略圖。 Next, a manufacturing apparatus and a manufacturing method of the polarizing plate of the present invention will be described with reference to the drawings. Fig. 1 is a schematic view showing an embodiment of a manufacturing apparatus of a polarizing plate of the present invention.

第1圖所示之偏光板之製造裝置30，沿著傳送方向依序設置：塗佈接合劑於透明薄膜2、3的單面用之接合劑塗佈裝置11、12；貼合透明薄膜2、3與偏光膜1而得到積層體4用之貼合滾輪(夾滾輪)51、52；於積層體4中，使透明薄膜2、3與偏光膜1密合之滾輪13；設置於相對該滾輪13的外圓周面的位置之第1活性能量線照射裝置14、15；設置於比其朝傳送方向更下游側之第2以後的活性能量線照射裝置16至18；以及傳送用夾滾輪19。 The polarizing plate manufacturing apparatus 30 shown in FIG. 1 is provided in order along the transport direction: a bonding agent coating device 11 and 12 for applying a bonding agent to one surface of the transparent films 2 and 3; and a transparent film 2; And the polarizing film 1 and the bonding roller (clamping roller) 51 and 52 for the laminated body 4, and the roller 13 in which the transparent film 2, 3 and the polarizing film 1 are adhered in the laminated body 4; The first active energy ray irradiation devices 14 and 15 at the positions of the outer circumferential surface of the roller 13 and the second and subsequent active energy ray irradiation devices 16 to 18 on the downstream side in the transport direction; and the transporting roller 19 .

首先，從捲狀物的狀態連續放出的透明薄膜2、3的單面，藉由接合劑塗佈裝置11、12塗佈活性能量線硬化型接合劑(接合劑塗佈步驟)。 First, an active energy ray-curable bonding agent (adhesive coating step) is applied to one surface of the transparent films 2 and 3 which are continuously discharged from the state of the roll by the bonding agent coating devices 11 and 12.

然後，於從捲狀物的狀態連續放出的偏光膜1的兩面，將塗佈有接合劑之透明薄膜2、3，透過接合劑積層所構成之積層體，在夾於向傳送方向旋轉的一對貼合滾輪 51、52間的狀態，藉由至少一側的貼合滾輪朝另一側的貼合滾輪的方向按壓，貼合偏光膜1與透明薄膜2、3，形成積層體4(貼合步驟)。 Then, on both sides of the polarizing film 1 continuously discharged from the state of the roll, the laminated body formed by the transparent film 2, 3 coated with the bonding agent and the layer of the bonding agent is sandwiched and rotated in the conveying direction. Fitting roller In the state of 51 and 52, the polarizing film 1 and the transparent films 2 and 3 are bonded together by the bonding roller of at least one side, and the laminated body 4 is formed, and the laminated body 4 is formed (bonding process).

然後，在該積層體4一邊密接於滾輪13的外圓周面一邊傳送的過程，從第1活性能量線照射裝置14、15朝滾輪13的外圓周面，照射活性能量線，使接合劑聚合硬化(活性能量線照射步驟)。 Then, the layered body 4 is conveyed while being in close contact with the outer circumferential surface of the roller 13, and the active energy ray is irradiated from the first active energy ray irradiation devices 14 and 15 toward the outer circumferential surface of the roller 13 to cause the bonding agent to be polymerized and hardened. (Active energy ray irradiation step).

再者，配置於傳送方向下游側之第2以後的活性能量線照射裝置16至18，係使接合劑完全聚合硬化之裝置，依據需要，可將之追加/省略。最後，積層體4通過傳送用夾持滾輪19，捲取於捲取滾輪20，作為偏光板。以下，詳細說明各步驟。 In addition, the second and subsequent active energy ray irradiation devices 16 to 18 disposed on the downstream side in the transport direction are devices for completely polymerizing and hardening the bonding agent, and may be added or omitted as necessary. Finally, the laminated body 4 is taken up by the take-up reel 20 by the conveyance holding roller 19 as a polarizing plate. Hereinafter, each step will be described in detail.

(接合劑塗佈步驟) (bonding agent coating step)

對透明薄膜2、3塗佈接合劑之方法，無特別限制，例如可利用刮刀(doctor blade)、線棒、狹縫塗佈法、缺角輪塗佈法(comma coater)、凹版塗佈法等各種塗佈方式。其中，考慮薄膜塗佈、路徑線的自由度、寬度的對應等，接合劑塗佈裝置11、12較理想為凹版滾輪。 The method of applying the bonding agent to the transparent films 2 and 3 is not particularly limited, and for example, a doctor blade, a wire bar, a slit coating method, a comma coater, or a gravure coating method can be used. Various coating methods. Among them, in consideration of film coating, degree of freedom of path lines, correspondence of width, and the like, the binder coating devices 11 and 12 are preferably gravure rollers.

於使用凹版滾輪作為接合劑塗佈裝置11、12進行接合劑的塗佈之情況，塗佈的接合劑之厚度(塗佈厚度)，較理想為約0.1至10μm，更理想為0.2μm至4μm。接合劑的塗佈厚度，根據對透明薄膜的線速度之凹版滾輪的速度比之牽引比調整。一般而言，牽引比(凹版滾輪的速度/線速度)調整為0.5至10，可調整接合劑的塗佈厚度為約 0.1至10μm。更具體地，透明薄膜2、3的線速度為10至100 m/分，凹版滾輪係與透明薄膜2、3的傳送方向相反方向地旋轉，凹版滾輪的速度為5至1000 m/分，可調整接合劑的塗佈厚度為約0.1至10μm。 In the case where the gravure roller is used as the bonding agent coating device 11, 12 for coating the bonding agent, the thickness (coating thickness) of the applied bonding agent is desirably about 0.1 to 10 μm, more desirably 0.2 μm to 4 μm. . The coating thickness of the bonding agent is adjusted according to the ratio of the speed of the intaglio roller to the linear speed of the transparent film. In general, the traction ratio (speed/line speed of the intaglio roller) is adjusted to 0.5 to 10, and the coating thickness of the bonding agent can be adjusted to be about 0.1 to 10 μm. More specifically, the linear speeds of the transparent films 2, 3 are 10 to 100 m/min, and the gravure roller system rotates in the opposite direction to the conveying direction of the transparent films 2, 3, and the speed of the intaglio roller is 5 to 1000 m/min. The coating thickness of the bonding agent is adjusted to be about 0.1 to 10 μm.

接合劑調製後，通常在15至40℃的範圍內之既定的溫度±5℃(例如既定的溫度為30℃的情況，30℃±5℃)，較理想為±3℃，更理想為±1℃的環境下塗佈。 After the bonding agent is prepared, it is usually at a predetermined temperature of 15 to 40 ° C ± 5 ° C (for example, a predetermined temperature of 30 ° C, 30 ° C ± 5 ° C), preferably ± 3 ° C, more preferably ± Coating at 1 ° C.

(貼合步驟) (Fitting step)

於本步驟，由上述步驟之塗佈有接合劑之透明薄膜2、3，透過接合劑，積層於從捲狀物的狀態連續放出的偏光膜1的兩面。該積層體，在夾於傳送方向旋轉的一對貼合滾輪51、52間的狀態，例如貼合滾輪51朝貼合滾輪52的方向按壓，使偏光膜1與透明薄膜2、3貼合，形成積層體4。此時，對貼合滾輪的按壓方向垂直的面成為±3°的範圍內的角度，較理想為±1°的範圍內的角度，特別理想為與垂直於按壓方向的面重疊，在貼合滾輪間傳送偏光膜。藉此，偏光膜與透明薄膜在貼合滾輪前接觸而不會產生氣泡。再者，貼合滾輪52可朝貼合滾輪51的方向按壓，亦可貼合滾輪51與貼合滾輪52兩者互相接近按壓。 In this step, the transparent films 2 and 3 coated with the bonding agent in the above-described steps are laminated on both surfaces of the polarizing film 1 continuously discharged from the state of the roll by the bonding agent. In the state in which the laminated body is interposed between the pair of bonding rollers 51 and 52 that are rotated in the conveying direction, for example, the bonding roller 51 is pressed in the direction of the bonding roller 52, and the polarizing film 1 and the transparent films 2 and 3 are bonded to each other. A laminate 4 is formed. In this case, the surface perpendicular to the pressing direction of the bonding roller is an angle within a range of ±3°, and preferably an angle within a range of ±1°, and particularly preferably overlaps with a surface perpendicular to the pressing direction. A polarizing film is conveyed between the rollers. Thereby, the polarizing film and the transparent film are in contact with each other before the bonding roller, and no air bubbles are generated. Further, the bonding roller 52 can be pressed in the direction in which the roller 51 is attached, or both the bonding roller 51 and the bonding roller 52 can be pressed close to each other.

而且，於第1圖，雖然顯示於透明薄膜2、3的單面，均勻塗佈接合劑，透明薄膜2、3的塗佈接合劑的面，與偏光膜1重疊，藉由貼合滾輪51、52貼合之方法，亦可於偏光膜1的兩面均勻塗佈接合劑，於偏光膜1的塗佈接合劑的面與透明薄膜2、3重疊，藉由貼合滾輪51、52貼合。 Further, in the first embodiment, the bonding agent is uniformly applied to one surface of the transparent films 2 and 3, and the surface of the transparent films 2 and 3 to which the bonding agent is applied is superposed on the polarizing film 1 by the bonding roller 51. In the method of bonding 52, the bonding agent may be uniformly applied to both surfaces of the polarizing film 1, and the surface of the polarizing film 1 to which the bonding agent is applied may be overlapped with the transparent films 2 and 3, and bonded by the bonding rollers 51 and 52. .

本發明的特徵為設置除塵滾輪，與一對貼合滾輪51、52的至少之一者接觸，以除去附著於前述貼合滾輪表面之灰塵。除塵滾輪係具有除去附著於前述貼合滾輪表面之灰塵等異物的機構之滾輪。例如，具備可除去附著於前述貼合滾輪表面之灰塵等異物之材料所構成之吸附層。如此的構成吸附層之材料，較理想為可除去附著於前述貼合滾輪表面之灰塵等異物，且不附著於貼合滾輪的表面之材料，例如非黏著性的高分子橡膠。作為非黏著性的高分子橡膠，例如聚矽氧(silicone)等。聚矽氧系高分子橡膠，可得到適度的黏著性。 A feature of the present invention is that a dust removing roller is provided to be in contact with at least one of the pair of bonding rollers 51, 52 to remove dust adhering to the surface of the bonding roller. The dust removing roller is a roller having a mechanism for removing foreign matter such as dust adhering to the surface of the bonding roller. For example, it has an adsorption layer made of a material that can remove foreign matter such as dust adhering to the surface of the bonding roller. The material constituting the adsorption layer is preferably a material that can remove foreign matter such as dust adhering to the surface of the bonding roller and does not adhere to the surface of the bonding roller, for example, a non-adhesive polymer rubber. As the non-adhesive polymer rubber, for example, silicone or the like. Polyoxymethylene polymer rubber provides moderate adhesion.

作為上述的除塵滾輪，可使用各種市售品。作為如此的市售品，例如YanGo公司製高分子橡膠除塵滾輪(RUS系列、HSS系列、LPS系列、SRR系列等)、TEKNEK公司製除塵滾輪。 As the above-described dust removing roller, various commercially available products can be used. As such a commercial item, for example, a polymer rubber dust removing roller (RUS series, HSS series, LPS series, SRR series, etc.) manufactured by YanGo Co., Ltd., and a dust removing roller manufactured by TEKNEK Corporation.

再者，可設置2個以上的除塵滾輪，與貼合滾輪51、52分別接觸，亦可設置只與貼合滾輪51、52之一者接觸之除塵滾輪。 Further, two or more dust removing rollers may be provided, and the bonding rollers 51 and 52 may be in contact with each other, or a dust removing roller that is in contact with only one of the bonding rollers 51 and 52 may be provided.

於第2圖，表示本發明一實施態樣之貼合滾輪以及除塵滾輪之概略側視圖。第2圖中，設置除塵滾輪51a，與貼合滾輪51接觸，用以除去附著於貼合滾輪51表面之灰塵，防止構成偏光板之積層體4(偏光膜1及透明薄膜2、3)產生凹痕(凹入)或氣泡。 Fig. 2 is a schematic side view showing a bonding roller and a dust removing roller according to an embodiment of the present invention. In the second drawing, the dust removing roller 51a is provided in contact with the bonding roller 51 to remove dust adhering to the surface of the bonding roller 51, and the laminated body 4 (the polarizing film 1 and the transparent film 2, 3) constituting the polarizing plate is prevented from being generated. Dent (recessed) or air bubbles.

於第3圖，表示本發明其他實施態樣之貼合滾輪、除塵滾輪以及轉印用黏著滾輪之概略側視圖。第3圖中，係 與第2圖同樣地設置除塵滾輪51a、52a，而進一步設置與除塵滾輪51a接觸之轉印用黏著滾輪51b，用以除去附著於除塵滾輪51a表面之灰塵，而且設置與除塵滾輪52a接觸之轉印用黏著滾輪52b，用以除去附著於除塵滾輪52a表面之灰塵。轉印用黏著滾輪備具備吸附其表面之灰塵等異物之黏著層。例如，該黏著層，可將複數片積層於轉印用黏著滾輪的表面，藉由剝離最表面使用完畢之黏著層，可容易地使新黏著層露出於最表面。藉由如此的操作，即使在使用中，也可維持轉印用黏著滾輪的吸附力，可防止因堆積於除塵滾輪表面之灰塵而使除塵滾輪的吸附力降低之情事。藉此，可更確實長時間地安定地除去附著於貼合滾輪51、52的灰塵。 Fig. 3 is a schematic side view showing a bonding roller, a dust removing roller, and an adhesive roller for transfer according to another embodiment of the present invention. In Figure 3, the system The dust removing rollers 51a and 52a are provided in the same manner as in the second embodiment, and the transfer adhesive roller 51b that is in contact with the dust removing roller 51a is further provided to remove dust adhering to the surface of the dust removing roller 51a, and is provided in contact with the dust removing roller 52a. The adhesive roller 52b is printed to remove dust adhering to the surface of the dust removing roller 52a. The adhesive roller for transfer is provided with an adhesive layer that adsorbs foreign matter such as dust on the surface. For example, in the adhesive layer, a plurality of sheets can be laminated on the surface of the transfer roller, and the new adhesive layer can be easily exposed to the outermost surface by peeling off the adhesive layer on the outermost surface. By such an operation, the adsorption force of the transfer roller for transfer can be maintained even during use, and the adsorption force of the dust removing roller can be prevented from being lowered due to dust deposited on the surface of the dust removing roller. Thereby, the dust adhering to the bonding rollers 51 and 52 can be removed stably for a long time.

轉印用黏著滾輪的材質無特別限制，但至少外圍的最表面係由可吸附灰塵等異物之黏著性材料所構成。作為如此的黏著性材料，例如丙烯酸系、胺甲酸乙酯(urethane)系黏著劑等。 The material of the transfer roller for transfer is not particularly limited, but at least the outermost surface of the periphery is made of an adhesive material that can adsorb foreign matter such as dust. As such an adhesive material, an acrylic type, an urethane type adhesive, etc. are mentioned, for example.

作為上述之轉印用黏著滾輪，可使用各種市售品。作為如此的市售品，例如YanGo公司製灰塵轉印用黏著膠帶滾輪、「Gapless^TM ULT」(商品名)、「Gapless^TM SRR」(商品名)或YanGo公司製「AMS黏著片滾輪(製品名)/ARSP Precut黏著片滾輪(商品名)」、TEKNEK公司製黏著滾輪。 As the above-mentioned transfer roller for transfer, various commercially available products can be used. As such a commercial item, for example, an adhesive tape roller for dust transfer by YanGo Co., Ltd., "Gapless ^TM ULT" (trade name), "Gapless ^TM SRR" (trade name), or "AMS adhesive sheet roller" manufactured by YanGo Co., Ltd. ) /ARSP Precut Adhesive Roller (trade name)", adhesive roller made by TEKNEK.

構成除塵滾輪的表面之材料對轉印用黏著滾輪的黏著力，較理想為0.20至2.00 kgf。更理想為0.30至1.00 kgf。 未達0.20 kgf時，在除塵能力不足的點上不理想，超過2.00 kgf時，在滾輪的旋轉不安定的點上不理想。再者，構成除塵滾輪的表面的黏著力，係使用數位推拉力計，於測定端子安裝轉印用黏著滾輪的紙片，接觸除塵滾輪表面的材料後，拉量規，以對應剝離時的負重。 The adhesion of the material constituting the surface of the dust removing roller to the transfer roller for transfer is preferably 0.20 to 2.00 kgf. More preferably, it is 0.30 to 1.00 kgf. When it is less than 0.20 kgf, it is not ideal at the point where the dust removal capacity is insufficient, and when it exceeds 2.00 kgf, it is not preferable at the point where the rotation of the roller is unstable. Further, the adhesive force constituting the surface of the dust removing roller is a digital push-pull force meter, and a paper sheet for attaching the transfer adhesive roller is attached to the measurement terminal, and the material of the surface of the dust removing roller is contacted, and then the gauge is pulled to correspond to the load at the time of peeling.

貼合滾輪的直徑無特別限制，較理想為50至400 mm。再者，一對貼合滾輪分別的直徑，可為相同，亦可為相異。貼合滾輪的寬度，較理想為300至3000 mm。 The diameter of the fitting roller is not particularly limited, and is preferably 50 to 400 mm. Furthermore, the diameters of the pair of bonding rollers may be the same or different. The width of the fitting roller is preferably 300 to 3000 mm.

除塵滾輪以及轉印用黏著滾輪的直徑無特別限制，但較理想為比除塵滾輪所接、觸之貼合滾輪的直徑小，更理想為50至150 mm。再者，除塵滾輪以及轉印用黏著滾輪分別的直徑，可為相同，亦可為相異。除塵滾輪以及轉印用黏著滾輪的寬度，較理想為300至3000 mm，可與除塵滾輪所接觸之貼合滾輪的寬度相同，更理想為稍長者。 The diameter of the dust removing roller and the transfer roller for transfer is not particularly limited, but it is preferably smaller than the diameter of the roller to which the dust removing roller is attached, and more preferably 50 to 150 mm. Furthermore, the diameters of the dust removing roller and the transfer roller for transfer may be the same or different. The width of the dust removing roller and the transfer roller for transfer is preferably 300 to 3000 mm, and the width of the bonding roller which is in contact with the dust removing roller is the same, and it is more preferably a slightly longer one.

作為貼合滾輪的材質，例如為金屬或橡膠。較理想為一對貼合滾輪之一者為金屬製滾輪，另一者為橡膠製滾輪。於一對貼合滾輪皆為金屬製的情況，容易因使用而於滾輪間受傷，有連續使用之困難。 The material of the bonding roller is, for example, metal or rubber. Preferably, one of the pair of bonding rollers is a metal roller, and the other is a rubber roller. When the pair of bonding rollers are made of metal, it is easy to be injured between the rollers due to use, and it is difficult to use continuously.

傳統的貼合滾輪，通常按壓的上側之貼合滾輪為橡膠製，下側之貼合滾輪為金屬製。此係因下側之貼合滾輪附有驅動馬達，以控制旋轉速度，下側之貼合滾輪為金屬製者，按壓時下側之貼合滾輪不會變形，貼合滾輪的圓周速度容易維持一定。但是，為了容易調整後述的正彎曲之彎曲，於本發明，較理想為按壓(上側)之貼合滾輪為金屬 製，另一(下側)貼合滾輪係至少其外圍表面為橡膠製。 In the conventional bonding roller, the upper bonding roller that is usually pressed is made of rubber, and the lower bonding roller is made of metal. This is because the lower side of the bonding roller is attached with a drive motor to control the rotation speed, and the lower side of the bonding roller is made of metal. When the pressing, the lower side of the bonding roller does not deform, and the circumferential speed of the bonding roller is easily maintained. for sure. However, in order to facilitate the adjustment of the bending of the positive bending described later, in the present invention, it is preferable that the pressing roller (the upper side) is a metal. The other (lower side) bonding roller is made of at least a peripheral surface of a rubber.

作為金屬製滾輪的母材，可使用各種習知的材質，較理想為不銹鋼，更理想為SUS304(包含18%的鉻與8%的鎳之不銹鋼)。於金屬製滾輪的表面，實施鉻電鍍處理較理想。 As the base material of the metal roller, various conventional materials can be used, and stainless steel is preferable, and SUS304 (containing 18% chromium and 8% nickel stainless steel) is more preferable. It is preferable to perform chrome plating on the surface of the metal roller.

橡膠製滾輪的材質無特別限制，例如NBR(腈橡膠)、泰坦(Titan)、胺甲酸乙酯、聚矽氧、EPDM(乙烯-丙烯-二烯橡膠)等，較理想為NBR、泰坦(Titan)、胺甲酸乙酯。橡膠滾輪的硬度，無特別限制，通常為60至100°，更理想為85至95°。再者，橡膠滾輪的硬度，可用根據JISK6253之硬度計測定。作為市售的硬度計，例如使用ASKA公司製橡膠硬度計「A型」等。具體而言，係於表面用棒狀物按壓時，以硬度計測定橡膠滾輪的表面阻力。 The material of the rubber roller is not particularly limited, and is, for example, NBR (nitrile rubber), Titan, urethane, polyoxymethylene, EPDM (ethylene-propylene-diene rubber), etc., preferably NBR, Titan (Titan) ), urethane. The hardness of the rubber roller is not particularly limited and is usually 60 to 100°, more preferably 85 to 95°. Further, the hardness of the rubber roller can be measured by a hardness meter according to JIS K6253. As a commercially available hardness tester, for example, a rubber hardness tester "A type" manufactured by ASKA Corporation or the like is used. Specifically, when the surface was pressed with a rod, the surface resistance of the rubber roller was measured by a durometer.

藉由貼合滾輪施加於積層體之壓力無特別限制，於使用金屬製滾輪與橡膠製滾輪作為一對貼合滾輪的情況，富士軟片製兩片式按壓箱(超低壓用)之瞬間壓力較理想為0.5至3.0 MPa，更理想為0.7至2.3 MPa。 The pressure applied to the laminated body by the bonding roller is not particularly limited, and when a metal roller and a rubber roller are used as a pair of bonding rollers, the instantaneous pressure of the two-piece pressing box (for ultra low pressure) made of Fujifilm is higher. It is preferably 0.5 to 3.0 MPa, more preferably 0.7 to 2.3 MPa.

除塵滾輪對貼合滾輪之按壓壓力(賦予除塵滾輪與貼合滾輪的接觸面之壓力)較理想為0.01至0.10 MPa，可藉由除塵滾輪的安裝角度適當調整。而且，轉印用黏著滾輪對除塵滾輪之按壓壓力(賦予轉印用黏著滾輪與除塵滾輪的接觸面之壓力)較理想為0.01至0.10 MPa，可藉由轉印用黏著滾輪的安裝角度適當調整。 The pressing pressure of the dust removing roller to the bonding roller (the pressure applied to the contact surface of the dust removing roller and the bonding roller) is preferably 0.01 to 0.10 MPa, which can be appropriately adjusted by the mounting angle of the dust removing roller. Further, the pressing pressure of the transfer roller for the dust removing roller (the pressure applied to the contact surface of the transfer roller and the dust removing roller) is preferably 0.01 to 0.10 MPa, which can be appropriately adjusted by the mounting angle of the transfer roller for transfer. .

設置於積層體4的貼合於液晶面板的面側之貼合滾輪 (第1貼合滾輪)的圓周速度，比相反側的貼合滾輪(第2貼合滾輪)的圓周速度快較理想。藉此，於所得之偏光板，可賦予貼合於液晶面板的面變成凸的，其相反側的面變成凹的彎曲(正彎曲)。於所得之偏光板，賦予貼合於液晶面板的面變成凹的，其相反側的面變成凸的彎曲(反彎曲)的情況，偏光板貼合於液晶胞時，中央部容易產生咬入氣泡等不良情形。再者，於該情況，使用金屬製滾輪作為第1貼合滾輪，使用至少外圍表面為橡膠製滾輪作為第2貼合滾輪較理想。 a bonding roller provided on the surface side of the laminated body 4 bonded to the liquid crystal panel The circumferential speed of the (first bonding roller) is preferably faster than the circumferential speed of the bonding roller (second bonding roller) on the opposite side. Thereby, in the obtained polarizing plate, the surface to be bonded to the liquid crystal panel can be made convex, and the surface on the opposite side becomes concave curved (positive bending). In the obtained polarizing plate, the surface to be bonded to the liquid crystal panel is concave, and the surface on the opposite side is convexly curved (reversely bent). When the polarizing plate is bonded to the liquid crystal cell, the central portion is likely to cause biting bubbles. Bad circumstances. Further, in this case, it is preferable to use a metal roller as the first bonding roller, and it is preferable to use a rubber roller as the second bonding roller on at least the outer surface.

再者，第2貼合滾輪的圓周速度為1時，第1貼合滾輪的圓周速度之比更理想為1.0050至1.0200。於第1貼合滾輪的圓周速度比該範圍快的情況，正彎曲的彎曲量變太大，偏光板貼合於液晶胞時，於端部容易產生咬入氣泡等不良情形，再者，於放置於嚴苛的環境下之情況，更加助長正彎曲，使偏光板的端部恐有從液晶胞剝離之虞。 Further, when the peripheral speed of the second bonding roller is 1, the ratio of the peripheral speed of the first bonding roller is more preferably from 1.050 to 1.0200. When the circumferential speed of the first bonding roller is faster than the range, the amount of bending of the positive bending becomes too large, and when the polarizing plate is bonded to the liquid crystal cell, a problem such as biting bubbles is likely to occur at the end portion, and further, the placing is performed. In the case of a harsh environment, the positive bending is further promoted, and the end portion of the polarizing plate may be peeled off from the liquid crystal cell.

滾輪13，其外圓周面係構成為鏡面之凸曲面，其表面一邊與積層體4密接，一邊傳送，一邊在該過程，藉由活性能量線照射裝置14、15，使接合劑聚合硬化。接合劑聚合硬化，只要使積層體4充分密接，滾輪13的直徑無特別限制。於接合劑未硬化狀態之積層體4，使通過滾輪13間的累積光量為10 mJ/cm²以上，照射活性能量線較理想。滾輪13，可與積層體4的線動作從動，或使其旋轉驅動，或者使其固定而積層體4可滑過其表面。而且，滾輪13係藉由活性能量線的照射而聚合硬化時，亦可作用為將積層體 4所產生的熱散熱之冷卻滾輪。於該情況，冷卻滾輪的表面溫度，較理想係設定為4至30℃。 The outer peripheral surface of the roller 13 is formed as a convex curved surface of the mirror surface, and the surface thereof is conveyed while being in close contact with the laminated body 4, and the bonding agent is polymerized and hardened by the active energy ray irradiation devices 14 and 15 in the process. The bonding agent is polymerized and hardened, and the diameter of the roller 13 is not particularly limited as long as the laminated body 4 is sufficiently adhered. In the layered body 4 in which the bonding agent is not cured, the amount of accumulated light passing between the rollers 13 is 10 mJ/cm ² or more, and it is preferable to irradiate the active energy ray. The roller 13 can be driven by the linear motion of the laminated body 4, or can be rotationally driven, or fixed, and the laminated body 4 can be slid over the surface thereof. Further, when the roller 13 is polymerized and cured by irradiation with an active energy ray, it can also function as a cooling roller that dissipates heat generated by the laminated body 4. In this case, the surface temperature of the cooling roller is desirably set to 4 to 30 °C.

(活性能量線照射步驟) (active energy ray irradiation step)

藉由活性能量線的照射，進行接合劑的聚合硬化所使用的光源，無特別限制，具有波長400 nm以下的發光分佈之光源較理想。作為如此的光源，例如低壓水銀燈、中壓水銀燈、高壓水銀燈、超高壓水銀燈、化學燈、黑光燈、微波激發水銀燈、金屬鹵化物燈。 The light source used for the polymerization hardening of the bonding agent by irradiation with the active energy ray is not particularly limited, and a light source having a light-emitting distribution of a wavelength of 400 nm or less is preferable. As such a light source, for example, a low pressure mercury lamp, a medium pressure mercury lamp, a high pressure mercury lamp, an ultra high pressure mercury lamp, a chemical lamp, a black light lamp, a microwave excited mercury lamp, and a metal halide lamp.

對活性能量線硬化型接合劑之光照射強度，由每一接合劑的組成決定，無特別限制，較理想為10至5000 mW/cm²。對樹脂組成物之光照射強度未達10 mW/cm²時，反應時間變得太長，超過5000 mW/cm²時，因從燈輻射之熱及組成物聚合時的發熱，可能產生接合劑的構成材料之環氧樹脂組成物等的黃變、偏光膜的劣化。再者，照射強度較理想為光陽離子聚合起始劑的活性化有效的波長區域之強度，更理想為波長400 nm以下之波長區域之強度，更加理想為波長280至320 nm之波長區域之強度。 The light irradiation intensity of the active energy ray-curable bonding agent is not particularly limited as long as it is determined by the composition of each bonding agent, and is preferably from 10 to 5,000 mW/cm ² . When the light irradiation intensity of the resin composition is less than 10 mW/cm ² , the reaction time becomes too long, and when it exceeds 5000 mW/cm ² , a bonding agent may be generated due to heat radiated from the lamp and heat generation during polymerization of the composition. The yellowing of the epoxy resin composition or the like of the constituent material and the deterioration of the polarizing film. Further, the intensity of the irradiation is preferably an intensity of a wavelength region effective for activation of the photocationic polymerization initiator, and more preferably a wavelength region of a wavelength of 400 nm or less, more preferably an intensity of a wavelength region of 280 to 320 nm. .

對活性能量線硬化型接合劑之活性能量線的照射時間，對於每一硬化的組成物進行之控制並無特別限制，但表示照射強度與照射時間的乘積之累積光量係設定為10 mJ/cm²以上，較理想為10至5,000 mJ/cm²。對上述接合劑之累積光量未達10 mJ/cm²時，來自引發劑之活性物種的產生不充分，接合劑的硬化變得不足。另一方面，其累積光量超過5,000 mJ/cm²時，照射時間變得非常長，對生產性 的提高變得不利。此時，隨著使用的薄膜、接合劑種類的組合等，需要的何種波長區域(UVA(320至390 nm))、UVB(280至320 nm))的累積光量不同。 The irradiation time of the active energy ray of the active energy ray-curable bonding agent is not particularly limited for the control of each hardened composition, but the cumulative light amount indicating the product of the irradiation intensity and the irradiation time is set to 10 mJ/cm. ² or more is more preferably 10 to 5,000 mJ/cm ² . When the cumulative light amount of the above bonding agent is less than 10 mJ/cm ² , the generation of the active species from the initiator is insufficient, and the hardening of the bonding agent becomes insufficient. On the other hand, when the cumulative light amount exceeds 5,000 mJ/cm ² , the irradiation time becomes extremely long, which is disadvantageous in improving productivity. At this time, depending on the film to be used, the combination of the types of the bonding agents, and the like, the required amount of light (UVA (320 to 390 nm)) and UVB (280 to 320 nm) are different.

於本發明，係對積層體照射活性能量線使接合劑聚合硬化，然而亦可併用藉由加熱之聚合硬化。 In the present invention, the layered body is irradiated with an active energy ray to cause the bonding agent to be polymerized and cured, but it may be used in combination with heat polymerization.

於活性能量線為紫外線的情況，在對積層體4照射活性能量線之步驟中，較理想為一邊對積層體4於長度方向(傳送方向)賦予100至800 N/m的張力，一邊以照射時間為0.1秒以上之線速度傳送積層體4。而且，紫外線的照射強度較理想為10 mW/cm²以上。 In the case where the active energy ray is ultraviolet ray, in the step of irradiating the laminated body 4 with the active energy ray, it is preferable to apply the tension to the longitudinal direction (transport direction) of the laminated body 4 by 100 to 800 N/m. The laminated body 4 is conveyed at a linear velocity of 0.1 second or longer. Further, the irradiation intensity of ultraviolet rays is preferably 10 mW/cm ² or more.

而且，於藉由活性能量線照射裝置14、15之活性能量線的累積光量為不充分的情況，較理想為進一步設置第2以後的活性能量線照射裝置16至18，追加照射活性能量線，促進積層體4的接合劑之硬化。該些全部步驟之累積光量設定為10 mJ/cm²以上，較理想為10至5,000 mJ/cm²。如此，於照射活性能量線的步驟，活性能量線的照射，較理想為分成複數次進行。 Further, when the accumulated light amount of the active energy ray by the active energy ray irradiation devices 14 and 15 is insufficient, it is preferable to further provide the second and subsequent active energy ray irradiation devices 16 to 18 to additionally illuminate the active energy ray. The hardening of the bonding agent of the laminated body 4 is promoted. The cumulative light amount of all of these steps is set to 10 mJ/cm ² or more, and more desirably 10 to 5,000 mJ/cm ² . Thus, in the step of irradiating the active energy ray, the irradiation of the active energy ray is preferably carried out in plural times.

為了確實進行偏光板(積層體)端部之接合劑的硬化，可舉例如無電極D燈泡之FUSION製「Light Hammer 10」，對薄膜的移動而言橫跨排列的方法等。 In order to secure the curing of the bonding agent at the end of the polarizing plate (layered body), for example, "Light Hammer 10" manufactured by FUSION, which is an electrodeless bulb, and a method of aligning the movement of the film, etc., may be mentioned.

活性能量線硬化型樹脂的硬化比例，亦即反應率，較理想為90%以上，更理想為95%以上。 The curing ratio of the active energy ray-curable resin, that is, the reaction rate is preferably 90% or more, more preferably 95% or more.

(偏光板捲取步驟) (Polarizing plate winding step)

捲取積層體(偏光板)4之張力為30 N/cm²至150 N/cm² 的範圍內。較理想為30 N/cm²至120 N/cm²的範圍內。未達30 N/cm²時，移動長條的捲狀物時，由於會引起捲取差異，所以不理想。大於150 N/cm²的情況，捲取的緊張強，有容易產生鬆弛的傾向。 The tension of the wound laminated body (polarizing plate) 4 is in the range of 30 N/cm ² to 150 N/cm ² . It is preferably in the range of 30 N/cm ² to 120 N/cm ² . When it is less than 30 N/cm ² , it is not preferable because the roll is moved when the long roll is moved. In the case of more than 150 N/cm ² , the tension of the coiling is strong, and there is a tendency that slack is likely to occur.

再者，捲的長度變得越長，因在相同張力容易引起捲取緊張(捲出時難以回復平坦的現象)，可將偏光板一邊捲至捲芯，一邊連續地或階段性地降低張力。如此賦予所謂之錐形狀以降低張力之方法中，此時的張力為150 N/cm²以下。 Further, the longer the length of the roll is, the more the winding tension is likely to be caused by the same tension (the phenomenon that it is difficult to return to flatness when unwinding), and the polarizing plate can be wound to the core while continuously or stepwisely reducing the tension. . In the method of imparting a so-called taper shape to reduce the tension as described above, the tension at this time is 150 N/cm ² or less.

捲取於捲芯之偏光板的長度無特別限制，較理想為100 m以上4000 m以下。 The length of the polarizing plate taken up by the winding core is not particularly limited, and is preferably 100 m or more and 4000 m or less.

圓筒狀的捲芯之直徑較理想為6至12吋。捲芯之直徑大者較理想，更理想為11吋、12吋等，再者於太大的情況，有移動、保管變困難的傾向。 The diameter of the cylindrical core is preferably 6 to 12 inches. The diameter of the core is larger, and it is more desirable to be 11 吋, 12 吋, etc., and in the case of too large, there is a tendency to move and store.

圓筒狀的捲芯之材質，因在無塵室使用，其自體發塵困難，可確保捲取寬度寬的偏光板在適當的強度下即可，無特別限制，可選擇FRP(玻璃纖維強化塑膠)等。 The material of the cylindrical core is difficult to self-drain due to its use in a clean room, and it can be ensured that the polarizing plate having a wide winding width can be at an appropriate strength, and is not particularly limited, and FRP (glass fiber) can be selected. Reinforced plastic).

實施例 Example

以下，舉出實施例，更詳細地說明本發明，但本發明不限於該些實施例。 Hereinafter, the present invention will be described in more detail by way of examples, but the invention is not limited thereto.

〔實施例1〕 [Example 1]

(偏光膜的製作) (production of polarizing film)

作為聚乙烯醇的原料薄膜，係使用聚合度2400、皂化度99.9莫耳%、厚度75μm、寬度3000 mm的長條聚乙烯 醇薄膜「VINYLON VF-PS#7500(可樂麗製)」。延伸係於處理槽前後的驅動夾滾輪賦予圓周速度差進行。 As a raw material film of polyvinyl alcohol, a long polyethylene having a polymerization degree of 2400, a degree of saponification of 99.9 mol%, a thickness of 75 μm, and a width of 3000 mm is used. Alcohol film "VINYLON VF-PS#7500 (made by Kuraray)". The driving clip roller extending before and after the processing tank imparts a peripheral speed difference.

首先，於使原料薄膜不鬆弛，保持薄膜的緊張狀態，於放入30℃的純水之膨潤槽中浸漬80秒，使薄膜充分膨潤，伴隨膨潤槽的膨潤，入口與出口的滾輪速度比為1.2。在夾滾輪進行除水後，於放入30℃的純水之水浸漬槽中，浸漬160秒。該槽中，機械方向的延伸倍率為1.09倍。 First, the raw material film was not slackened, and the film was kept in a state of tension. The film was immersed in a swelling tank of pure water at 30 ° C for 80 seconds to sufficiently swell the film, and the speed ratio of the inlet to the outlet was increased with the swelling of the swelling groove. 1.2. After the water was removed by the pinch roller, it was placed in a water dipping tank of pure water at 30 ° C, and immersed for 160 seconds. In this groove, the stretching ratio in the machine direction is 1.09 times.

然後，浸漬於放入碘/碘化鉀/水之重量比為0.02/2.0/100的水溶液之染色槽的同時，一邊以延伸倍率約1.5倍進行一軸延伸。然後，在放入碘化鉀/硼酸/水之重量比為12/3.7/100的水溶液之硼酸槽中，於55.5℃浸漬130秒的同時，一邊從原料的累積延伸倍率成為5.7倍為止進行一軸延伸。然後，在放入碘化鉀/硼酸/水之重量比為9/2.4/100的水溶液之硼酸槽中，於40℃浸漬60秒。 Then, it was immersed in a dyeing tank containing an aqueous solution of iodine/potassium iodide/water in a weight ratio of 0.02/2.0/100, and one-axis extension was carried out at a stretching ratio of about 1.5 times. Then, in a boric acid bath in which an aqueous solution of potassium iodide/boric acid/water in a weight ratio of 12/3.7/100 was placed, the mixture was immersed at 55.5 ° C for 130 seconds, and the axial stretching was performed from the cumulative stretching ratio of the raw material to 5.7 times. Then, it was immersed at 40 ° C for 60 seconds in a boric acid bath in which an aqueous solution of potassium iodide/boric acid/water in a weight ratio of 9/2.4/100 was placed.

再者，於水洗槽，以8℃的純水進行洗淨約16秒，然後，依序通過約60℃的乾燥爐、約85℃的乾燥爐，在該些乾燥爐的滯留時間合計為160秒，進行乾燥。如此，得到碘吸附配向之厚度28μm的偏光膜。 Further, the washing tank was washed with pure water at 8 ° C for about 16 seconds, and then sequentially passed through a drying furnace at about 60 ° C and a drying furnace at about 85 ° C, and the residence time in the drying furnaces was 160 in total. In seconds, dry. Thus, a polarizing film having a thickness of 28 μm in which iodine was adsorbed and aligned was obtained.

(偏光板的製作) (production of polarizing plate)

作為透明薄膜，準備厚度40μm的賦予相位差特性之乙酸纖維素系樹脂薄膜「KC4CR-1」(柯尼卡美能達公司製)以及厚度80μm的三乙醯纖維素薄膜「KC8UX2MW」(柯尼卡美能達公司製)。 A cellulose acetate-based resin film "KC4CR-1" (manufactured by Konica Minolta Co., Ltd.) having a thickness of 40 μm and a triacetyl cellulose film "KC8UX2MW" having a thickness of 80 μm were prepared as a transparent film (Konica). Minolta company system).

然後，於上述厚度40μm的賦予相位差特性之乙酸纖 維素系樹脂薄膜「KC4CR-1」的單面，使用接合劑塗佈裝置(Micro Chamber Doctor：富士機械公司製)，塗佈紫外線硬化型接合劑之環氧樹脂組成物「KR系列」(ADEKA公司製、包含陽離子聚合起始劑)。而且，於上述厚度80μm的三乙醯纖維素薄膜「KC8UX2MW」的單面，使用相同的接合劑塗佈裝置，塗佈紫外線硬化型接合劑之環氧樹脂組成物「KR系列」(ADEKA公司製、包含陽離子聚合起始劑)。此時，接合劑塗佈裝置的偏光膜積層體的線速度為25 m/分，使凹版滾輪與積層材料的傳送方向相反方向旋轉，厚度40μm的賦予相位差特性之乙酸纖維素系樹脂薄膜「KC4CR-1」上的接合劑層的厚度約為3.5μm，厚度80μm的三乙醯纖維素薄膜「KC8UX2MW」上的接合劑層的厚度約為3.5μm。 Then, the cellulose acetate fiber having a phase difference characteristic of 40 μm in thickness The epoxy resin composition "KR series" (ADEKA) of the ultraviolet curing type bonding agent was applied to the single side of the vitamin resin film "KC4CR-1" using a bonding agent coating device (Micro Chamber Doctor: manufactured by Fuji Machinery Co., Ltd.). Made by the company, including cationic polymerization initiator. Furthermore, the epoxy resin composition "KR series" (made by Adeka Co., Ltd.) of the ultraviolet curing type bonding agent was applied to the single surface of the above-mentioned three-layered cellulose film "KC8UX2MW" having a thickness of 80 μm. Containing a cationic polymerization initiator). At this time, the linear velocity of the polarizing film layered product of the adhesive application device was 25 m/min, and the cellulose acetate-based resin film having a phase difference characteristic of 40 μm in thickness was rotated in the opposite direction to the direction in which the intaglio roller was conveyed. The thickness of the bonding agent layer on KC4CR-1" was about 3.5 μm, and the thickness of the bonding agent layer on the triacetyl cellulose film "KC8UX2MW" having a thickness of 80 μm was about 3.5 μm.

然後，於上述偏光膜的兩面，將上述厚度40μm的賦予相位差特性之乙酸纖維素系樹脂薄膜「KC4CR-1」與厚度80μm的三乙醯纖維素薄膜「KC8UX2MW」，透過上述環氧樹脂組成物(紫外線硬化型接合劑)進行貼合。此時，於貼合滾輪，設置聚矽氧系除塵滾輪「HSS系列」(YanGo公司製)以及與該除塵滾輪接觸之轉印用黏著滾輪「AMS黏著片滾輪(製品名)/ARSP Precut黏著片滾輪(商品名)(YanGo公司製)」。而且，構成除塵滾輪表面的材料對轉印用黏著滾輪之黏著力為0.74 kgf。 Then, on the both surfaces of the polarizing film, a cellulose acetate-based resin film "KC4CR-1" having a phase difference characteristic of 40 μm and a triacetonitrile cellulose film "KC8UX2MW" having a thickness of 80 μm were passed through the epoxy resin. The material (ultraviolet curing type bonding agent) is bonded. In this case, the HSS series dust collector "HSS series" (manufactured by YanGo Co., Ltd.) and the transfer adhesive roller "AMS adhesive sheet roller (product name) / ARSP Precut adhesive sheet) which is in contact with the dust removing roller are provided. Roller (trade name) (manufactured by YanGo). Further, the material constituting the surface of the dust removing roller had an adhesion force to the transfer roller for transfer of 0.74 kgf.

上述2種透明薄膜貼合之偏光膜，一邊與長度方向上賦予600 N/m的張力之冷卻滾輪密接，一邊以線速度25 m/ 分移動，使其通過從金屬鹵化物燈2盞(GS-YUASA公司製、每1盞的電力為130 W/cm)照射之紫外線中，進行第1活性能量線照射步驟，然後，使其通過從設置之無電極D燈泡3盞(Fusion公司製「Light Hammer 10」、每1盞的電力為216 W/cm)照射之紫外線中，進行第2活性能量線照射步驟，製作偏光板。 The polarizing film in which the above two kinds of transparent films are bonded is adhered to a cooling roller which is given a tension of 600 N/m in the longitudinal direction, and has a linear velocity of 25 m/ The first active energy ray irradiation step was carried out by ultraviolet light irradiated from a metal halide lamp 2 (a power of 130 W/cm per one made by GS-YUASA Co., Ltd.), and then passed through. The second active energy ray irradiation step was carried out from the ultraviolet rays irradiated by the electrodeless D bulb 3 (the "Light Hammer 10" manufactured by Fusion Co., Ltd., and the electric power per Torr was 216 W/cm) to prepare a polarizing plate.

上述無電極D燈泡1盞，係將排列於薄膜的寬度方向之6台無電極D燈泡所構成的單元，於薄膜的長度方向配置成1列。 The electrodeless D bulb 1 is a unit composed of six electrodeless D bulbs arranged in the width direction of the film, and arranged in a row in the longitudinal direction of the film.

通過金屬鹵化物燈時，使貼合於上述偏光膜之厚度80μm的三乙醯纖維素薄膜「KC8UX2MW」與設定於23℃之冷卻滾輪之外圓周面接觸，從厚度40μm的賦予相位差特性之乙酸纖維素系樹脂薄膜「KC4CR-1」側照射紫外線。 In the case of a metal halide lamp, the triacetonitrile cellulose film "KC8UX2MW" having a thickness of 80 μm bonded to the polarizing film is brought into contact with the outer circumferential surface of the cooling roller set at 23 ° C, and the phase difference characteristic is imparted from a thickness of 40 μm. The cellulose acetate resin film "KC4CR-1" side is irradiated with ultraviolet rays.

(缺陷產生率的評價) (Evaluation of defect generation rate)

於實施例1，對生產的偏光板之長度(m)，調查起因於附著於貼合滾輪之異物的缺陷產生次數時，為4次/100萬m。結果表示於表1。 In the first embodiment, the length (m) of the produced polarizing plate was investigated 4 times/100,000 m when the number of occurrences of defects due to foreign matter adhering to the bonding roller was investigated. The results are shown in Table 1.

〔實施例2〕 [Example 2]

除了於貼合滾輪設置聚矽氧系除塵滾輪「LPS系列」(YanGo公司製)以及與該除塵滾輪接觸之轉印用黏著滾輪(YanGo公司製)，構成除塵滾輪表面的材料對轉印用黏著滾輪之黏著力為0.52 kgf以外，與實施例1同樣地製作偏光板。 In addition to the "LPS series" (manufactured by YanGo Co., Ltd.) and the transfer adhesive roller (manufactured by YanGo Co., Ltd.) which is in contact with the dust removing roller, the material constituting the surface of the dust removing roller is bonded to the transfer adhesive. A polarizing plate was produced in the same manner as in Example 1 except that the adhesion of the roller was 0.52 kgf.

(缺陷產生率的評價) (Evaluation of defect generation rate)

於實施例2，對生產的偏光板之長度(m)，調查起因於附著於貼合滾輪之異物的缺陷產生次數時，為4次/100萬m。結果表示於表1。 In the second embodiment, the length (m) of the produced polarizing plate was investigated 4 times/100,000 m when the number of occurrences of defects due to foreign matter adhering to the bonding roller was investigated. The results are shown in Table 1.

〔實施例3〕 [Example 3]

除了於貼合滾輪設置聚矽氧系除塵滾輪「RUS系列」(YanGo公司製)以及與該除塵滾輪接觸之轉印用黏著滾輪(YanGo公司製)，構成除塵滾輪表面的材料對轉印用黏著滾輪之黏著力為0.38 kgf以外，與實施例1同樣地製作偏光板。 In addition to the "rolling roller" "RUS series" (manufactured by YanGo Co., Ltd.) and the transfer roller (manufactured by YanGo Co., Ltd.) which is in contact with the dust removing roller, the material constituting the surface of the dust removing roller is bonded to the transfer roller. A polarizing plate was produced in the same manner as in Example 1 except that the adhesion of the roller was 0.38 kgf.

(缺陷產生率的評價) (Evaluation of defect generation rate)

於實施例3，對生產的偏光板之長度(m)，調查起因於附著於貼合滾輪之異物的缺陷產生次數時，為6次/100萬m。結果表示於表1。 In the third embodiment, the length (m) of the produced polarizing plate was investigated 6 times/100,000 m when the number of occurrences of defects due to foreign matter adhering to the bonding roller was investigated. The results are shown in Table 1.

〔實施例4〕 [Example 4]

除了於貼合滾輪不設置轉印用黏著滾輪以外，與實施例1同樣地製作偏光板。 A polarizing plate was produced in the same manner as in Example 1 except that the bonding roller was not provided with the bonding roller.

(起因於附著於貼合滾輪之異物的缺陷產生率的評價) (Evaluation of defect generation rate due to foreign matter attached to the bonding roller)

於實施例4，對生產的數量，調查起因於附著於貼合滾輪之異物的缺陷產生率時，為4次/30萬m。結果表示於表1。 In Example 4, when the amount of production due to foreign matter adhering to the bonding roller was investigated, the rate of occurrence of defects was 4 times/300,000 m. The results are shown in Table 1.

〔比較例1〕 [Comparative Example 1]

除了於貼合滾輪不設置除塵滾輪及轉印用黏著滾輪以外，與實施例1同樣地製作偏光板。 A polarizing plate was produced in the same manner as in Example 1 except that the dust removing roller and the transfer adhesive roller were not provided to the bonding roller.

(起因於附著於貼合滾輪之異物的缺陷產生率的評價) (Evaluation of defect generation rate due to foreign matter attached to the bonding roller)

於比較例1，對生產的數量，調查起因於附著於貼合滾輪之異物的缺陷產生率時，有4次以上/10萬m。結果表示於表1。 In Comparative Example 1, when the number of defects produced due to foreign matter adhering to the bonding roller was investigated, the number of productions was 4 or more and 100,000 m. The results are shown in Table 1.

(產業上的利用可能性) (industrial use possibility)

本發明的偏光板，可有效地應用於以液晶顯示裝置為代表之各種顯示裝置。 The polarizing plate of the present invention can be effectively applied to various display devices typified by liquid crystal display devices.

1‧‧‧偏光膜 1‧‧‧ polarizing film

2,3‧‧‧透明薄膜 2,3‧‧‧Transparent film

4‧‧‧積層體(偏光板) 4‧‧‧Laminated body (polarizer)

11,12‧‧‧接合劑塗佈裝置 11,12‧‧‧Adhesive coating device

13‧‧‧滾輪(冷卻滾輪) 13‧‧‧Roller (cooling roller)

14,15,16,17,18‧‧‧活性能量線照射裝置 14,15,16,17,18‧‧‧Active energy line irradiation device

19‧‧‧傳送用夾持滾輪 19‧‧‧Transporting roller

20‧‧‧捲取滾輪 20‧‧‧Rolling wheel

51,52‧‧‧貼合滾輪 51,52‧‧‧fit roller

Claims (3)

一種偏光板之製造方法，其係將透明薄膜貼合於偏光膜的單面或兩面所構成的偏光板之製造方法，其特徵為具備：於前述透明薄膜的單面或者前述偏光膜的單面或兩面，塗佈活性能量線硬化型接合劑之接合劑塗佈步驟；在使前述透明薄膜透過前述接合劑積層於前述偏光膜的單面或兩面所構成的積層體夾於向傳送方向旋轉的一對貼合滾輪間的狀態，藉由至少一側的滾輪朝另一側的貼合滾輪的方向按壓，以貼合前述透明薄膜與前述偏光膜之貼合步驟；以及對前述積層體照射活性能量線，使前述接合劑硬化之活性能量線照射步驟；並以與前述一對貼合滾輪的至少之一者接觸之方式設置除塵滾輪，用以除去附著於前述貼合滾輪表面之灰塵。 A method for producing a polarizing plate, which is a method for producing a polarizing plate comprising a transparent film bonded to one surface or both surfaces of a polarizing film, comprising: one side of the transparent film or one side of the polarizing film Or an adhesive coating step of applying an active energy ray-curable bonding agent on both sides; and a laminated body formed by laminating the transparent film through the bonding agent on one surface or both surfaces of the polarizing film, and rotating in a conveying direction a state in which a pair of bonding rollers are pressed by at least one roller toward the bonding roller on the other side to adhere the bonding step of the transparent film and the polarizing film; and to irradiate the laminated body with an activity The energy line is an active energy ray irradiation step of curing the bonding agent; and a dust removing roller is provided in contact with at least one of the pair of bonding rollers to remove dust adhering to the surface of the bonding roller. 如申請專利範圍第1項所述之偏光板之製造方法，復以與前述除塵滾輪接觸之方式設置轉印用黏著滾輪，用以除去附著於前述除塵滾輪表面之灰塵。 In the method for producing a polarizing plate according to the first aspect of the invention, the transfer roller for transfer is provided in contact with the dust removing roller to remove dust adhering to the surface of the dust removing roller. 一種偏光板之製造裝置，其係透明薄膜貼合於偏光膜的單面或兩面所構成的偏光板之製造裝置，其特徵為具備：於前述透明薄膜的單面或者前述偏光膜的單面或 兩面，塗佈活性能量線硬化型接合劑用之接合劑塗佈裝置；一邊傳送一邊夾壓令前述透明薄膜透過前述接合劑積層於前述偏光膜的單面或兩面所構成的積層體，藉此貼合前述透明薄膜與前述偏光膜用之一對貼合滾輪；以及對前述積層體照射活性能量線，使前述接合劑硬化用之活性能量線照射裝置；並以與前述一對貼合滾輪的至少之一者接觸之方式設置至少一個除塵滾輪。 A manufacturing apparatus of a polarizing plate which is a manufacturing apparatus of a polarizing plate which is formed by bonding a transparent film to one surface or both surfaces of a polarizing film, and is characterized in that: one surface of the transparent film or one surface of the polarizing film or An adhesive coating device for applying an active energy ray-curable bonding agent on both sides, and a laminated body formed by laminating the transparent film through the bonding agent on one surface or both surfaces of the polarizing film while being conveyed And a pair of bonding rollers for bonding the transparent film and the polarizing film; and an active energy ray irradiation device for irradiating the laminated body with an active energy ray to cure the bonding agent; and the pair of bonding rollers At least one of the dust removing rollers is disposed in contact with at least one of them.