200946993 六、發明說明： 【發明所屬之技術領域】 本發明係有關一種偏光板之製造方法 經由接著劑層而積層於由聚乙烯醇椒昨'’其係將保護膜' 一側，藉此而製造偏光板。 、日斤構成之偏光膜之 【先前技術】 偏光板係廣泛使用作為液晶顯示裝中 元件、或偏光之檢測元件。此等偏光…之偏光供給 ο 乙酸纖維素所構成之保護膜接著於由聚 光膜而成者，但近年來，隨著液、構成之偏 筆記型電腦和手機等攜帶式機器、‘1=普遍用於 視等，而要求薄型輕量化。另外，由』=大= 用場所變得更廣泛，故同時亦要求提升耐久性㈣7使 例如，在曰本特開平1〇_186133八 中，為了達成薄型輕量化查“專利文獻1) 而案僅將保護膜積層於偏氺 φ 侧:Γ偏先板。另外，在曰本特開 :=(專利文獻2)中，提案-種偏光板之製造方法， 其係僅將 =膜積層於偏光膜之一側而製成偏光板。然 而如該利文獻】、2所記載，若僅將保護膜積層於偏 光膜之側而，造偏光板，則在將偏光膜與保護膜積層 後在使，、乾燥之乾燥步射，當配置成使偏光板之偏光 膜側處於下方I使保護膜側處於上方時會有容易發生 使保護族側變成凸型（因而使偏細側㈣凸型）之捲曲 (稱為逆捲曲）問題。 320903 200946993 若逆捲曲大，則當將偏光膜面以與液晶面板表面對合 之方向（亦即從液晶面板來看，使保護膜位於外側）經由 黏著劑層等使偏光板貼合於液晶面板時，已知在黏著劑層 與液晶面板之間容易產生氣泡（例如參照曰本特‘ 2004-184809 (專利文獻 3))。 此逆捲曲被認為係由於在偏光膜與保護膜積層後之 乾燥步驟中偏光膜收縮而導致之現象’藉由在偏光膜不易 發生收縮之溫度40。(：以下進行乾燥即可抑制。另一方面， 若乾燥溫度低’則為了使偏光板充分乾燥， 需.要長時間之 ❹ 乾燥，而有生產上之問題。若欲在有限之時間中進行乾燥， 則會因乾燥不足而偏光板發生不均勻之問題。當以偏光板 表面反射螢光燈時，此不均勻現象會使螢光燈之影像明顯 地變形。第1圖係表示使螢光燈反射於發生不均勻現象之 偏光极表面時的狀態，由此可知螢光燈之影像係明顯地變 形。 【發明内容】 (發明欲解決之課題） 於是，本發明之目的係提供一種有效率地製造偏光板 t方法’其係經由接著劑層將保護膜積層於由聚匕婦醇樹 月曰所構成之偏光臈之一侧，藉此而製造捲曲情形少之偏光 板。 (解決課題之方法） 本發明者等為了達成上述 目的而進行精心研究’結果 發現將保護膜經由水系接著劑層而積層於由聚乙嫜醇樹脂 320903 200946993 所構成之偏光膜之一側以製造偏光板時，在使用水系接 劑層而將偏光膜與保護膜積層後，藉由以特定之乾燥條件 進行乾燥，即可有效地獲得捲曲情形少之偏光板。亦即， 本發明係如下述。 本發明係提供一種偏光板之製造方法’其包含下述步 驟：將保護膜經由水系接著劑層而貼合於由聚乙烯醇樹脂 所構成之偏光臈之一側的貼合步驟、以及使偏光膜與保護 膜之貼合物乾燥的乾燥步驟。其中’乾燥步驟係包含下述 ❻—步驟·:在溫.度保持於未達〇。〇之乾燒爐中滯留至其合計滞 留時間成為150秒以上的低浪乾操步驟、以及在溫度保持 於50 C以上.之乾魚爐中滯留:裏其合计滯留時'間成為150秒 以下的高溫乾燥步驟。 本發明之偏光板之製造方法中’乾無步驟較佳係依據 低溫乾燥步驟、高溫乾燥步鱗、低溫乾燥步雜之順序進行。 本發明之偏光板之製造方法中之保護膜’係以由乙酸 ❹纖維素樹腊所構成之薄膜為德。 本發明之偏光板之製造方法中’尚溫乾燥步驟中之乾 燥爐溫度係以保持於6〇。(：以下為佳。 (發明之效果） 若依據本發明，甴於是夜保護膜積層於由聚乙烯醇所 構成之偏光膜之一側，故比起雨侧皆積層有保護膜之偏光 一 板，可使偏光板厚度變薄，炎f有效地製造捲曲量少之偏 光板。 . 【實施方式】 5 320903 200946993 本發明之偏光板之製造方法基本上包含下述步驟：將 _ 保護f經由水系接著劑層而貼合於由聚乙烯醇樹脂所構成 之偏光膜之一侧的貼合步騨、以及使偏光膜與保護祺之貼 合物在特定條件下乾燥的乾燥步驟。若依據本發明之偏光 板之製造方法，由於是使保護膜積層於由聚乙烯醇所構成 之偏光膜之一侧，故比起雨侧皆積層有保護膜之偏光板， 可使偏光板厚度變薄，並可有效地製造捲曲量少之偏光板。 本發明之偏光板之製造方法中供應貼合步騍之偏光 膜，具體上係對於聚乙烯醇樹脂膜施予單轴延伸及以二色 性色素進行染色處理，並使該二色性色素吸附配向而成 〇 者。構成偏光膜之聚乙烯醇樹脂通常可藉由將聚乙酸乙稀 酯樹脂予以皂化而獲得。聚乙烯醇樹脂之皂化度通常為約 85莫耳％以上，較佳為約90莫耳％以上，更佳為約99莫 耳％至100莫耳％。就聚乙酸乙烯酯系樹脂而言，除了屬 於乙酸乙烯酯之均聚物的聚乙酸乙烯酯以外，尚可列舉如 乙酸乙烯醋與可與其共聚合之其他單體的共聚物，例如乙 稀-乙酸乙烯酯共聚物等。就可與乙酸乙烯酯共聚合之其他 Ο 單體而言，可列舉如不飽和羧酸、烯烴、乙烯基醚、不飽 和績酸等。聚乙烯醇樹脂之聚合度通常為1〇〇〇至1〇〇〇〇 左右，較佳為1500至5000左右。 此等聚乙烯醇樹脂亦可經改質，例如可使用經醛改質 之聚乙稀基縮甲( P〇lyvinyl f〇rmal )、聚乙烯基縮藤 (polyvinyl acetal )、聚乙稀基縮丁搭（p〇iyVinyi butyral) 等。通常’就製造偏光膜之原始材料而言，係使用厚度20 6 320903 200946993 至 1〇0 # m (較佳為30至80//m)之聚乙烯醇樹脂膜之夫 延伸膜。工業上係以薄膜寬度1500 S 4_nm為且實 性。將此未延相依_處理、祕處理、观處f t ===:乾，直Γ酸處理為止之步· 5,50μιη。 經乾燥而獲得之偏光暝之厚度例如為 、偏光膜之製作方法係大致分成2種製造方 〇200946993 VI. Description of the Invention: [Technical Field] The present invention relates to a method for producing a polarizing plate which is laminated on the side of a protective film by a polyvinyl alcohol pepper via an adhesive layer. A polarizing plate is manufactured. A polarizing film composed of a Japanese jin. [Prior Art] A polarizing plate is widely used as a component in a liquid crystal display device or a detecting element for polarized light. Polarized light supply of such polarized light... The protective film composed of cellulose acetate is followed by a light-collecting film. However, in recent years, with the liquid, the portable computer such as a notebook computer and a mobile phone, '1= It is commonly used for viewing and is required to be thin and lightweight. In addition, it is required to increase the durability (4) 7 for example, in the case of 曰本特开平1〇_1861338, in order to achieve a thin and lightweight check "Patent Document 1" Only the protective film is laminated on the side of the 氺φ Γ: Γ 先 。 。 。 。 : : : = = = = = = = = = = = = = = = = = = = = = 专利 专利 专利 专利 专利 专利 = = = = = = = = A polarizing plate is formed on one side of the film. However, as described in the above, if only the protective film is laminated on the side of the polarizing film to form a polarizing plate, the polarizing film and the protective film are laminated. Dry drying step, when arranged such that the polarizing film side of the polarizing plate is below I and the protective film side is above, the protective group side is likely to be convex (and thus the thin side (four) convex type) Curl (referred to as reverse curl) problem. 320903 200946993 If the reverse curl is large, the polarizing film surface is placed in the direction of the liquid crystal panel (that is, the protective film is located outside from the liquid crystal panel) via the adhesive layer. When the polarizing plate is attached to the liquid crystal panel, it is known Air bubbles are easily generated between the adhesive layer and the liquid crystal panel (for example, refer to 曰本特' 2004-184809 (Patent Document 3)). This reverse curl is considered to be due to shrinkage of the polarizing film in the drying step after the polarizing film and the protective film are laminated. The phenomenon caused by the phenomenon that the polarizing film is less likely to shrink 40 ((: The following drying can be suppressed. On the other hand, if the drying temperature is low), in order to sufficiently dry the polarizing plate, it takes a long time. Dry, but there are production problems. If you want to dry in a limited time, there will be unevenness of the polarizing plate due to insufficient drying. This unevenness will occur when the fluorescent lamp is reflected on the surface of the polarizing plate. The image of the fluorescent lamp is significantly deformed. Fig. 1 shows a state in which the fluorescent lamp is reflected on the surface of the polarizing electrode where unevenness occurs, and it is understood that the image of the fluorescent lamp is significantly deformed. The object of the present invention is to provide a method for efficiently producing a polarizing plate t. A polarizing plate having a small amount of curling is produced on the side of the polarizing enamel which is formed by the crucible. (The method of solving the problem) The inventors of the present invention conducted intensive studies to achieve the above object, and found that the protective film was passed through the aqueous adhesive layer. When a polarizing plate is laminated on one side of a polarizing film composed of polyacetal resin 320903 200946993, the polarizing film and the protective film are laminated using a water-based adhesive layer, and then dried by a specific drying condition. The present invention is as follows. The present invention provides a method for producing a polarizing plate, which comprises the steps of: bonding a protective film via a water-based adhesive layer. a step of bonding on one side of a polarizing ray composed of a polyvinyl alcohol resin, and a drying step of drying a laminate of the polarizing film and the protective film. The 'drying step' includes the following ❻-steps: maintained at a temperature of less than 〇.低 干 干 干 干 干 低 低 低 低 低 低 低 低 低 150 150 150 150 150 150 150 150 150 150 150 150 150 150 150 150 150 150 150 150 150 150 150 150 150 150 150 150 150 150 150 150 150 150 150 150 150 150 150 150 150 High temperature drying step. In the method for producing a polarizing plate of the present invention, the step of drying is preferably carried out in the order of a low-temperature drying step, a high-temperature drying step, and a low-temperature drying step. The protective film ' in the method for producing a polarizing plate of the present invention is a film composed of cellulose acetate wax. In the method for producing a polarizing plate of the present invention, the drying oven temperature in the still drying step is maintained at 6 Torr. (The following is preferable. (Effect of the invention) According to the present invention, since the night protective film is laminated on one side of the polarizing film composed of polyvinyl alcohol, a polarizing plate having a protective film is laminated on the rain side. The thickness of the polarizing plate can be made thin, and the polarizing plate having a small amount of curl can be efficiently produced. [Embodiment] 5 320903 200946993 The manufacturing method of the polarizing plate of the present invention basically comprises the following steps: _protecting f via a water system a bonding step of bonding the coating layer to one side of the polarizing film made of a polyvinyl alcohol resin, and a drying step of drying the bonding film of the polarizing film and the protective layer under specific conditions. In the method for producing a polarizing plate, since the protective film is laminated on one side of the polarizing film made of polyvinyl alcohol, the polarizing plate having a protective film laminated on the rain side can reduce the thickness of the polarizing plate, and The polarizing plate having a small amount of curling can be efficiently produced. In the method for producing a polarizing plate of the present invention, a polarizing film of a bonding step is supplied, specifically, a uniaxial stretching is applied to the polyvinyl alcohol resin film, and a dichroic dye is introduced. The dyeing treatment is carried out, and the dichroic dye is adsorbed and aligned. The polyvinyl alcohol resin constituting the polarizing film can be usually obtained by saponifying a polyvinyl acetate resin. The degree of saponification of the polyvinyl alcohol resin is usually About 85 mol% or more, preferably about 90 mol% or more, more preferably about 99 mol% to 100 mol%. In the case of a polyvinyl acetate resin, in addition to a homopolymer belonging to vinyl acetate In addition to polyvinyl acetate, copolymers such as vinyl vinegar and other monomers copolymerizable therewith, such as ethylene-vinyl acetate copolymer, etc., may be cited as other copolymers copolymerizable with vinyl acetate. The body may, for example, be an unsaturated carboxylic acid, an olefin, a vinyl ether or an unsaturated acid. The degree of polymerization of the polyvinyl alcohol resin is usually from about 1 Torr to about 1 Torr, preferably from 1,500 to 1,500. 5,000 or so. These polyvinyl alcohol resins can also be modified, for example, aldehyde-modified polyethylene fluorene (P〇lyvinyl f〇rmal), polyvinyl vine (polyvinyl acetal), polyethylene Dilute condensate (p〇iyVinyi butyral), etc. 'For the original material for manufacturing a polarizing film, a polyvinyl alcohol resin film stretch film of thickness 20 6 320903 200946993 to 1〇0 # m (preferably 30 to 80//m) is used. The film width is 1500 S 4_nm and it is solid. This is not extended, _ treatment, secret treatment, observation ft ===: dry, straight acid treatment step 5 · 50μιη. The thickness is, for example, a method of producing a polarizing film, which is roughly divided into two manufacturing methods.
Si係醇樹脂膜於嫩惰性氣體中進行單二ί 伸後’依膨潤處理步驟、染色處理步 ：：軸延 水洗處理询之順輕聽减理 镇^驟及 法。第2種方法係將未延伸之聚乙稀 之方 膨潤處理步驟、染色處理步驟、賴處理^以水溶液依 步驟之順序進雜缝理，並在概處理m洗處理 步驟中㈣式雜單軸㈣，最錢行細之前之 ❹ 佳。延伸方法可==數個步驟中進行為 ，例如有'^m # 親間具有周速差而進行―二 之數目和二口 :序:=:處- 附加上述第】種及第2種方法未記載之2於=的而 例可列舉如:在赠處理後，以不含领酸之：:::之 打的浸潰處理（埃化物處理）或以不_^含^ = 320903 . 7 200946993 等之水溶液進行的浸潰處理（鋅處理）等。 膨潤處理步驟係以去除薄膜表面之異物、去除薄膜中 之塑化劑、賦予下一步驟之易染色性、使薄膜可塑化等作 為目的而進行。關於處理條件，係在可達成此等目的之範 圍内，且在不會極端溶解基材薄膜、不會產生失透明化等 不良情形之範圍内決定。使預先在氣體中經延伸之薄膜進 行膨潤時，例如係在20至70°C，較佳為30至60°C之水溶 液中浸潰薄膜而進行。薄膜之浸潰時間為30至300秒，較 佳為60至240秒。而在使未先經延伸之原始膜進行膨潤 時，例如係在10至50°C，較佳為20至40°C之水溶液中浸 潰薄膜而進行。薄膜之浸潰時間為30至300秒，較佳為 60至240秒。 在膨潤處理步驟中，由於薄膜容易在寬度方向膨潤而 使薄膜產生皺紋等問題。故較佳係以擴寬輥（擴張輥）、螺 旋輥（spiral roll )、齒冠親（crown roll )、布導引器（cloth guider )、彎曲棒（bend bar)、拉幅機央等周知之擴張裝置 去除薄膜之皺紋，並同時運送薄膜。以使浴中之薄膜運送 安定化作為目的，將膨潤浴中之水流以水中淋浴來控制、 或是併用EPC ( Edge Position Control裝置：用以檢測薄膜 之端部並防止薄膜之蛇行的裝置）等之方法亦為有用。在 本步驟中，由於薄膜也會往薄膜之運送方向膨潤擴大，故 為了消除薄膜在運送方向之鬆弛，以進行例如控制處理槽 前後之運送輥之速度等手段為佳。另外，關於使用之膨潤 處理浴，除了純水以外，亦可使用以0.01至0.1重量％之 8 320903 200946993 機鹽本特開平06侧16號公報）、無機酸、無 、岭性有機溶媒、醇類等而成之水溶液。 中使色處理步驟，其目的係於薄膜 目的之配向等。處理條件係在可達成此等 透明化等且在不會極端溶解基材薄膜、不會產生失 素時，敎範㈣蚊。纽_作為二色性色 Ο 件下，你田ΐ10至45°c(較佳為20至3rc)之溫度條 重量比為碘/碘化鉀/水=(0 003至0 2) ol 化鋅等h卷订次潰處理。亦可使用其他硬化物（例如碘 m 切化鉀。又，亦可將其他魏物與硬化钾 爛酸2化Γ:亦可共存有魏物以外之化合^ 氯化鋅、虱化鈷等。添加有硼酸時，就含有碘 古與下述硼酸處理區隔。只要是相對於水1〇〇 丄 有碟^3重量份以上者，即可視為染色槽。重量伤含 在20:使用一色性色素作為水溶性二色性染料時，例如传 以。t (較佳為30至账)之溫度條件下^ ，:、、、一色姓染料/水：（〇〇〇1至〇1) /1〇〇濃度之 在使色:秒ί較佳為6〇至3〇。秒)進行浸漬處理。 可含有^ 染料之水溶液中，可含有染色助劑等，亦 可酸鋼等無機鹽、界面活性劑等。二色性4 獨使用，亦可併用2種以上之二色性染料。“ 如上所述’亦可在染色槽中使薄膜延伸。關於延伸， 320903 . 200946993 後之失轉具有周速差之方法等進行。另 出入口吱置播：s步驟同樣地，在染色浴中及/或染色浴 ;曲棒;擴寬耗(擴張親)、碟旋輥、齒冠輕-布導引器、 二=係藉由在相對於水100"份含有顧1至 重量伤之水溶液中’將經二色性 樹脂膜予以浸清而、隹一 卞邑之聚乙烯醇糸 仃。虽一色性色素為碘時，以含有碘 化物1至3〇曹暑々乂炎乂土 ^ ❹ $。，量為佳。碘化物可列舉如碘化鉀、碘化鋅 备’隹亦可共存有蛾化物以外之化合物，例如氣化鋅、 氯、氣化鍅、硫代硫酸鈉、亞硫酸鉀、硫酸鈉等。 棚酸處理係為了達成由交聯所致之耐水化和色相調 整（防止帶有藍色色調等）等而實施者。為了達成由交聯 所致之耐水化而進行硼酸處理時，亦可因應需要而在硼酸 以外或與硼酸一起使用乙二醛、戊二醛等交聯劑。又，有 時亦將用以達成耐水化之硼酸處理稱呼為耐水化處理、交 聯處理、固定化處理等名稱。另外，有時亦將用以達成色 相調整之硼酸處理稱呼為補色處理、再染色處理等名稱。 此獨酸處理係依據其目的而適當變更棚酸及碘化物 之濃度、處理浴之溫度。用以達成耐水化之硼酸處理、用 以達成色相—調整之硼酸處理係並非特別區別者，可依據下 述條件而實施。當將原始膜予以膨潤處理、染色處理、硼 酸處理’並且硼酸處理係以達成由交聯所致之耐水化作為 目的時，係使用相對於水100重量份含有硼酸3至1〇重量 份、碘化物1至20重量份之硼酸處理浴，通常在50至70 10 320903 200946993 °C，較佳為55至65°C之溫度下進行。浸潰時間為卯至3〇〇 秒。又，在對預先經延伸之薄膜進行染色處理、硼酸處理 時，棚酸處理浴之溫度通常為50至85Ϊ，較佳為55至8〇 在用以達成耐水化之蝴酸處理後，亦可進行用以達成 色相調整之硼酸處理。例如，當二色性染料為碘時，為了 達成上述目的，係使用相對於水100重量份含有硼酸【至 5重量份、碘化物3至30重量份之硼酸處理浴，通常在1〇 ❹ ❹ 至45¾之溫度下進行。浸潰時間通常為3至3〇〇秒，較佳 為10至24〇秒。後績之用以達成色相調整之硼酸處理，相 較於甩以達成耐水化之棚酸處理，通常是以 度、較高之識化物濃度、較低之溫度進行-又低之,駿濃' 此等棚酸處理可由複數個步驟所構成，、 2至5個步驟進行。此時，所使用之各嗍酸^常多半是幻 液組成、溫度係在上述範圍内，可為相同或不理槽之呔遂 複數偭步驟來進行上述用以達成耐水化之 同。可轉由 Ί.駿廬挪 逹成色相調整之硼酸處理。現、甩以 地進行薄膜之延伸。最終之累計延伸倍率為4理歩驟4i 佳為4.5至6.5倍。在此’所謂「累計延伸佟=7倍， 始臈長度方向之基準長度在所有延伸處理結」係相 成為多長之長度，例如，在原始膜中原本為1史4 在所有延伸處理結束後之薄膜中若成為5m， m之部为 延伸倍率專5倍。 、此時之累 32〇9〇3 11 200946993 處理後，進行水洗處理。水洗處理係將為了達 *主 或色相調整而經硼酸處理之聚乙烯醇樹脂膜 浸潰於水中，藉ώ w 1 田以水作為淋浴來噴霧、或併用浸潰與喷 =進'水洗處理中水之溫度通常為2至桃，浸潰時 間為2至12〇秒。 〇 〇 延伸處理後之各個步驟中，可進行張力控制 膜之張力分別在實質上成為-定。具體而言，當在 * &理步驟巾結束延伸時’係在其後之硼酸處理步驟及 水洗處理步驟中進行張力控制。當在染色處理步驟之前步 驟中、^束延伸時’係在包含染色處理步驟及酸處理步驟 之後續步驟中進行張力控制。當侧酸處理步驟係由複數個 硼^處理步驟所構成時，較佳係在最初或從最初開始至第 2段為止之蝴酸處理步驟中延伸前述薄膜、並在從已進行 人伸處理之觸酸處理步驟之下—個爛酸處理步驟至水洗步 驟為j的各個步驟中進行張力控制，或是在從最初開始至 第3段為止之費處理步驟中延伸前述薄膜、並在從已進 行L申處理之爛酸處理步驟之下__個爛酸處理步驟至水洗 步驟為止的各解财騎張力㈣，但^#性而言， 更佳係j最初或從最初開始至第2段為止之硼酸處理步驟 中延伸前述薄膜、並在從已進行延伸處理之魏處理步驟 之下一個餐處理步驟至水洗步驟為止的各個步驟中進行 另外’在砸處理後，當進行如上述之埃化物 處理或鋅處理時，在此等步驟中亦可進行張力控制。 從膨潤處理结洗處料权各個步财之張力係 320903 12 200946993 。 可為相同或不同。張力控制中對於薄膜之張力並無特別限 疋’可適當設定在每奉位見度為150至200.0N/m，較佳為 600至15〇〇N/m之範園内。當張力小於150N/m時，薄膜 容易產生皺紋等.。另，方面，當張力超過2000N/m時，則 • 會產生因薄臈之破裂和軸承之磨損所致之低壽命化等問 題。另外’’此每單位寬度之張力係由該步驟 < 入口附近 之薄膜寬度與張力檢測器之張力值所計算出。此外，進行 張力控制.時，雖然不f避免地會有若干延伸.收.縮之倩形，.. ❹但此等通常不包含於延伸處理中。 在偏光膜製作步驟之最後，進行乾燥處理。乾燥處理 係以逐漸改變張力並多階段進行之方法為佳，但從設備上 之限制來看，通常係以2至3段進行。當以2段進行時， 别段之張力較佳係設定在600至15〇〇N/m之範圍内，後段 之張力較佳係設定在300至l2〇〇N/m之範圍内。當張力太 大時，薄膜之破裂變多，當張力太小時，則皺紋變多，故 ❹為不佳。另外，前段之乾燥溫度較佳係設定在3〇至9〇。〇 之％圍内，後段之乾燥溫度較佳係設定在至1⑻。C之-範 圍内。當溫度太高時，薄膜之破裂變多且光學特性下降， 當溫度太低時，則條紋變多，故為不佳。乾燥處理時間例 如可為60至000秒’各段之乾燥時間可為相同或不同。若 時間太長，則在生產性方面為不佳，若時間太短，則乾燥 不夠充分而不佳。 另外，供本發明之偏先板之製造方法中所使用之偏光 膜，其水分率係無特別限制，較佳為3至14重量％之範圍 13 320903 200946993 為3至1〇重量%之範圍内，特佳為3至8重量y =著=;r未達3重量二= 偏光膜之：=4得容易裂開而難以處理，又，當 容易收縮之虞。：：％時，偏光膜在乾熱環境下有 前後重量變化而算出偏=在丨阶乾熱下減1小時之 内之水分率的偏』之水分率。具有上述較佳範圍 度及乾燥時如獲得/可藉由例如控制偏光膜之乾燥溫 •XP ittAfter the Si-based alcohol resin film is subjected to a single extension in a tender inert gas, the swelling treatment step, the dyeing treatment step, the following step, the water treatment, and the treatment are performed. In the second method, the unexpanded polyethylene swelling treatment step, the dyeing treatment step, the aging treatment, the aqueous solution according to the order of the steps, and the singular processing of the (4) type singular axis (4) The best money before the fine line is good. The extension method can be performed in a number of steps, for example, there is a '^m # 亲 亲 亲 亲 亲 亲 亲 亲 亲 亲 亲 周 ― ― ― ― ― ― ― ― ― ― : : : : : : : : : : : : : : : : : : : The undocumented 2 is exemplified by, for example, after the treatment, the impregnation treatment (the treatment of the ED) without the acid:::: or the _^ containing ^ = 320,903. 7 Immersion treatment (zinc treatment) by an aqueous solution such as 200946993. The swelling treatment step is carried out for the purpose of removing foreign matter on the surface of the film, removing the plasticizer in the film, imparting dyeability to the next step, plasticizing the film, and the like. The treatment conditions are determined within a range in which such a purpose can be achieved, and in a case where the base film is not extremely dissolved and no loss of transparency occurs. When the film which has been previously stretched in the gas is swollen, for example, the film is impregnated in an aqueous solution of 20 to 70 ° C, preferably 30 to 60 ° C. The film has a dipping time of 30 to 300 seconds, preferably 60 to 240 seconds. On the other hand, when the original film which has not been stretched first is swollen, for example, the film is impregnated in an aqueous solution of 10 to 50 ° C, preferably 20 to 40 ° C. The film is impregnated for 30 to 300 seconds, preferably 60 to 240 seconds. In the swelling treatment step, the film is likely to swell in the width direction to cause wrinkles and the like in the film. Therefore, it is preferable to use a widening roller (expansion roller), a spiral roller, a crown roll, a cloth guider, a bend bar, a tenter, etc. The expansion device removes wrinkles from the film and simultaneously transports the film. For the purpose of stabilizing the transport of the film in the bath, the water in the swelling bath is controlled by a shower in the water, or EPC (Edge Position Control device: device for detecting the end of the film and preventing the meandering of the film) is used in combination. The method is also useful. In this step, since the film is swollen and expanded in the direction in which the film is conveyed, it is preferable to control the slack of the film in the transport direction, for example, to control the speed of the transport roller before and after the treatment tank. In addition, as for the swelling treatment bath to be used, in addition to pure water, it is also possible to use 0.01 to 0.1% by weight of 8 320903 200946993 machine salt, Beckering 06 side No. 16 publication, inorganic acid, no, ferrous organic solvent, alcohol An aqueous solution such as a class. The intermediate color processing step is for the alignment of the film purpose. The treatment conditions are such that, when such transparency and the like are achieved, and the substrate film is not extremely dissolved and no depletion occurs, the cockroach (four) mosquitoes are used. New _ as a dichroic color ,, your temperature ratio of 10 to 45 ° C (preferably 20 to 3 rc) is iodine / potassium iodide / water = (0 003 to 0 2) ol zinc, etc. The volume is ordered to be broken. Other hardened materials (for example, iodine m-cut potassium) can be used. In addition, other Wei materials and hardened potassium rotten acid can be used to form bismuth: co-existing with chemical compounds other than Wei materials, zinc chloride, cobalt hydride, and the like. When boric acid is added, it contains iodine and the following boric acid treatment zone. As long as it is more than 3 parts by weight with respect to water, it can be regarded as a dyeing tank. The weight injury is contained in 20: use one color When the dye is used as a water-soluble dichroic dye, for example, it is passed at a temperature of t (preferably 30 to account). ^, :,, a color name dye/water: (〇〇〇1 to 〇1) /1 The enthalpy concentration is in the color: seconds ί is preferably 6 〇 to 3 〇. sec. The aqueous solution containing the dye may contain a dyeing assistant or the like, and may also be an inorganic salt such as acid steel or a surfactant. Dichroic 4 can be used alone or in combination with two or more dichroic dyes. "As mentioned above, the film can also be stretched in the dyeing tank. Regarding the extension, 320903. 200946993, the rotation is delayed by the method of the circumferential speed difference, etc. The other inlet and outlet are placed: the s step is the same, in the dyeing bath and / or dye bath; curved rod; widening consumption (expansion pro), disc roller, crown light-cloth guide, two = by using in the water relative to the water 100 " 'Polyvinyl alcohol oxime which is immersed in a dichroic resin film. Although the one-color pigment is iodine, it contains 1 to 3 碘 〇 〇 〇 〇 。 。 。 。 , , , , , , , , , , , The amount of the iodide may be, for example, potassium iodide or zinc iodide. Compounds other than moth compounds such as zinc sulfide, chlorine, gasified bismuth, sodium thiosulfate, potassium sulfite, sodium sulfate, etc. may be present. The linic acid treatment is carried out in order to achieve hydration resistance and hue adjustment (prevention of blue color tone, etc.) by crosslinking, etc. In order to achieve hydration resistance by crosslinking, it is also possible to perform boric acid treatment. Use of glyoxal or pentane with or without boric acid as needed A cross-linking agent such as an aldehyde. In addition, a boric acid treatment for achieving water resistance is sometimes referred to as a water-resistant treatment, a cross-linking treatment, an immobilization treatment, etc. In addition, a boric acid treatment for achieving hue adjustment may be used. The name is called complementary color treatment, re-dye treatment, etc. This acid-only treatment changes the concentration of shed acid and iodide and the temperature of the treatment bath according to the purpose. To achieve the hydration-resistant boric acid treatment, to achieve hue-adjustment The boric acid treatment system is not particularly distinguished, and can be carried out according to the following conditions: when the original film is subjected to swelling treatment, dyeing treatment, boric acid treatment, and boric acid treatment is carried out for the purpose of achieving water resistance by crosslinking, Using a boric acid treatment bath containing 3 to 1 part by weight of boric acid and 1 to 20 parts by weight of iodide with respect to 100 parts by weight of water, usually at a temperature of 50 to 70 10 320903 200946993 ° C, preferably 55 to 65 ° C The immersion time is 卯 to 3 〇〇. Further, when the pre-stretched film is subjected to dyeing treatment or boric acid treatment, the temperature of the linic acid treatment bath is usually 50 to 85 Å, preferably After 55 to 8 〇 to achieve the hydration-resistant sulphuric acid treatment, boric acid treatment for achieving hue adjustment can also be performed. For example, when the dichroic dye is iodine, in order to achieve the above purpose, the use is relative to water. 100 parts by weight of a boric acid treatment bath containing boric acid [to 5 parts by weight, iodide 3 to 30 parts by weight, usually at a temperature of from 1 Torr to 453⁄4. The immersion time is usually from 3 to 3 sec., preferably from 3 to 3 sec. It is 10 to 24 sec. The boric acid treatment for achieving hue adjustment after the performance is compared with hydrazine to achieve hydration resistance, usually with a degree, a higher concentration of the compound, and a lower temperature - And low, Jun Con' can be composed of a plurality of steps, and 2 to 5 steps. At this time, each of the phthalic acid used is often composed of a phantom liquid, and the temperature is within the above range. The same can be done for the same or to avoid the hydration of the tank. It can be transferred to 硼. Jun 庐 逹 逹 色 into the hue adjustment of boric acid treatment. The film is now stretched out. The final cumulative stretch ratio is 4.5 to 6.5 times better. Here, the so-called "accumulated extension 佟 = 7 times, the length of the reference length in the length direction is the length of all the extension processing knots", for example, in the original film, originally 1 history 4 after all the extension processing ends When the film is 5 m, the part of m is 5 times the stretching ratio. At this time, after the treatment, 32〇9〇3 11 200946993, the water is washed. The water washing treatment is performed by immersing the boric acid-treated polyvinyl alcohol resin film in water for the purpose of adjusting the main or hue, and spraying the water with the water as a shower, or using the dipping and spraying together in the water washing treatment. The temperature of the water is usually 2 to peach and the dipping time is 2 to 12 seconds. 〇 各个 In each step after the elongation treatment, the tension of the tension control film can be substantially constant. Specifically, the tension control is performed in the subsequent boric acid treatment step and the water washing treatment step when the * & When the step is extended before the dyeing step, the tension is controlled in a subsequent step including the dyeing step and the acid treating step. When the side acid treatment step is constituted by a plurality of boron treatment steps, it is preferred to extend the film in the initial acid treatment step from the beginning or from the beginning to the second stage, and to perform the stretching treatment from the prior art. Under the acid treatment step - a rotting acid treatment step to the water washing step, the tension control is performed in each step of j, or the film is extended in the cost processing step from the beginning to the third paragraph, and The L-acid handling step of the L-treatment process is __ a bit of the acid-riding tension until the water-washing step (4), but in the case of ^#, it is better that the system j is initially or from the beginning to the second paragraph. Extending the foregoing film in the boric acid treatment step, and performing the other steps in the respective steps from the meal treatment step to the water washing step under the Wei treatment step in which the elongation treatment has been carried out, after performing the treatment as described above. In the case of zinc or zinc treatment, tension control can also be carried out in these steps. From the swelling treatment of the knot washing material right, the tension of each step is 320903 12 200946993. Can be the same or different. The tension of the film in the tension control is not particularly limited, and can be appropriately set in a range of from 150 to 200.0 N/m, preferably from 600 to 15 N/m. When the tension is less than 150 N/m, the film is liable to cause wrinkles and the like. On the other hand, when the tension exceeds 2000 N/m, there is a problem that the life is shortened due to the breakage of the thin crucible and the wear of the bearing. Further, the tension per unit width is calculated from the film width in the vicinity of the entrance & the tension value of the tension detector. In addition, when the tension control is performed, although there is a certain amount of extension, the shrinkage, and the like, are not included in the extension processing. At the end of the polarizing film production step, a drying treatment is performed. The drying treatment is preferably carried out in a plurality of stages by gradually changing the tension, but in terms of equipment limitations, it is usually carried out in 2 to 3 stages. When it is carried out in two stages, the tension of the other sections is preferably set in the range of 600 to 15 〇〇 N/m, and the tension in the latter stage is preferably set in the range of 300 to 12 〇〇 N/m. When the tension is too large, the crack of the film becomes large, and when the tension is too small, the wrinkles become more, so that the flaw is not good. Further, the drying temperature of the preceding stage is preferably set to 3 Torr to 9 Torr. Within the % of 〇, the drying temperature of the latter stage is preferably set to 1 (8). Within the C-range. When the temperature is too high, the cracking of the film becomes large and the optical characteristics are degraded. When the temperature is too low, the streaks become large, which is not preferable. The drying treatment time can be, for example, 60 to 000 seconds. The drying time of each stage can be the same or different. If the time is too long, it is not good in terms of productivity. If the time is too short, the drying is not sufficient. Further, the polarizing film used in the method for producing a partial sheet of the present invention has a moisture content of not particularly limited, and is preferably in the range of 3 to 14% by weight. 13 320903 200946993 is in the range of 3 to 1% by weight. , especially good for 3 to 8 weight y = with =; r not up to 3 weight two = polarizing film: = 4 is easy to crack and difficult to handle, and, when it is easy to shrink. In the case of ::%, the polarizing film has a weight change before and after the dry heat environment, and the water content of the partial change of the moisture content within one hour of the dry heat of the step is calculated. Having the above preferred range and drying/when drying, for example, by controlling the drying temperature of the polarizing film • XP itt
辛音推、#醇樹月旨膜料單轴延伸、以二色七 色素進仃之*色處理及- 之厚度通常為5至^之=—。此偏絲 制，月之偏光板之製造方法巾，於此偏光膜之"~ 乙 接著劑層而積層’以製成偏光板。就销 護膜而吕’可列舉如環烯烴樹脂膜、三乙酸纖維素、 酸，維素等乙酸纖維素樹脂膜、聚對苯二曱酸乙二酯— 〇 蔡甲酸乙一酉曰、聚對笨二甲酸丁二醋等聚醋樹脂膜；】 碳酸§曰細曰膜、丙婦酸系樹脂膜、聚丙烯樹脂膜等在該《 域中從以往至今廣泛使用之薄膜。 了作為本發明之保護膜使用之環烯煙樹脂，係可適當 地使用適且之市售品’例如Topas( Ticona公司製）、ARTON (JSR股份有限公司製）、zE〇n〇r(日本ZE〇N股份有限 公司製）、ZEONEX (曰本ZE0N股份有f艮公司製,）、APEL (三井化學股份有限公司製）等。當將此等環烯烴樹脂製 膜而作成薄膜時，係適宜使用溶劑澆鑄法、熔融楼壓法等 14 320903The singularity of the singularity of the singularity of the singularity of the singularity of the singularity of the singularity of the singularity of In the method of manufacturing a polarizing plate of the moon, a polarizing plate is formed by laminating a layer of the polarizing film. As for the pin film, L' can be exemplified by a cyclic olefin resin film, a cellulose acetate resin such as cellulose triacetate, an acid, a vitamin, a cellulose terephthalate resin, a polyethylene terephthalate, a ruthenium phthalate, and a polypair. A polyester resin film such as a diced dicarboxylic acid butyl vinegar; a film which is widely used in the field from the past, such as a carbonic acid 曰 fine film, a propylene glycol resin film, or a polypropylene resin film. For the cycloolefin resin to be used as the protective film of the present invention, a commercially available product such as Topas (manufactured by Ticona Co., Ltd.), ARTON (manufactured by JSR Co., Ltd.), and zE〇n〇r (Japan) can be suitably used. ZE〇N Co., Ltd., ZEONEX (manufactured by Sakamoto ZE0N Co., Ltd.), APEL (manufactured by Mitsui Chemicals, Inc.), etc. When the cycloolefin resin is formed into a film to form a film, a solvent casting method, a molten floor pressing method, or the like is suitably used.
200946993 J '周知之方法。另外’亦可使用例如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（〇ptes股份有限公司製）等預先經製 膜之環烯烴樹脂製薄膜之市售品。 環烯煙樹脂膜可為經單軸延伸或雙軸延伸者。藉由延 伸，即可賦予任意之相位差值於環烯烴樹脂膜。延伸通常 係一邊連續進行將膜輥捲出、同時在加熱爐中，朝輥之進 行方向、與該進行方向垂直之方向、或該等兩方向進行延 © 伸。加熱爐之溫度通常係約從環烯烴系樹脂之破璃轉移溫 度至玻璃轉移溫度+ 100。(：之範圍。延伸之倍率通常為11 至6倍，較佳為1.1至3.5倍。 環烯烴樹脂膜一般由於其表面活性差，故以在與偏光 膜接著之表面進行電漿處理、電暈處理、紫外線照射處理、 火焰（flame)處理、專化處理等表面處理為佳。其中，以 較容易實施之電漿處理、電暈處理為較佳。 φ 另外，本發明中可作為保護膜使用之乙酸纖維素樹脂 膜係可適當地使用適宜之市售品，例如Fujitac TD80 (富 士薄膜股份有限公司製）、FujitacTD80UF (富士薄膜股份 有限公司製）、Fujitac TD80UZ (富士薄膜股份有限公司 製）、Fujitac TD40UZ (富士薄膜股份有限公司製）、 KC8CX2M( Konica Minolta Opto 股份有限公司製）、KC4UY (Konica Minolta Opto股份有限公司製)等。 對於乙酸纖維素樹脂膜之表面，亦可因應用途而施予 防眩處理、硬塗處理.、抗靜電處理、抗反射處理等表面處 15 320903 200946993 理。另外，為了改善視角特性，亦可形成液晶層等。又， 為了賦予相位差，亦可將纖維素樹脂膜予以延伸。此外， 為了提高與偏光膜之接著性，通常對此乙酸纖維素樹脂膜 施予皂化處理。皂化處理可採用浸潰於氫氧化鈉或氫氧化 鉀等臉性水溶液中之方法。 當上述之保護膜為輥狀態時，由於膜有容易互相接著 而發生黏接之傾向，故在輥之端部施予凹凸加工、或在端 部插入條帶（ribbon )、或貼合防護膜而製成輥捲。 保護膜之厚度以薄者為佳，但若太薄，會使強度降 低、加工性變差。另一方面，若太厚，則會產生使透明性 降低、或在積層後所需之硬化時間變長等問題。因此，保 護膜之適當厚度為例如5至100# m左右，較佳為10至80 // m，更佳為20至40 // m。 在本發明之偏光板之製造方法中，偏光膜與保護膜係 經由使用聚乙烯醇樹脂水溶液、水系二液型胺酯系乳液接 著劑等之水系接著劑層而貼合。 當將與偏光膜之接著面以皂化處理等進行親水化處 理而製成之乙酸纖維素膜作為保護膜使用時，聚乙烯醇樹 脂水溶液可適用於作為接著劑。作為接著劑使用之聚乙烯 醇樹脂中，除了將屬於乙酸乙烯酯之均聚物的聚乙酸乙烯 酯予以皂化處理而獲得之乙烯醇均聚物以外，尚可列舉如 將乙酸乙烯酯與可與其共聚合之其他單體的共聚物予以皂 化處理而獲得之乙烯醇共聚物、再將該等之羥基予以部分 改質之改質聚乙烯醇聚合物等。水系接著劑中亦可添加多 16 320903 200946993 元搭、水溶性環氧化合物、三聚氛胺化合物、氧化錐化合 物、鋒化合物等添加劑。當使用此等水系接著劑時，由: 所得之接著劑層通常為一以下，即使以通常:光= 微鏡觀察截面，事實上亦觀料_接著劑層。 ❹ 祕細與㈣賴合之韻絲特難定，可列舉 =述之m接㈣均勻地塗佈於偏_及/或保護膜 廿f面’將另一方之薄膜重合於塗佈面，藉由輥進行貼合， 並加以乾燥。通常接著劑係在調製後於15至贼之溫度 下塗佈’貼合溫度通常為15至30。(：之範圍。 將偏光膜與保護膜貼合時，為了保護與倾膜相反侧 偏先膜表面不受損傷等，亦可貼合可剝離之防護膜。例 了在偏光板之偏細面形成轉劑層之情料，此防護膜 可在不需要其之階段將其剝離。 防護膜與偏光膜之間之剝離力為〇 〇1至5N/25mm， =佳為謂至2N/25mm，更佳為〇.〇1至〇 5聽匪。剝 =力若未達O.Oi廳顏，則由於偏光膜與防護膜之密著 力小，而使防賴有部分㈣之情m若剝離力超 過5 N/25mm，則由於難以從偏光膜將防護膜剝離而為 不佳。 防護膜之材質可使用容易處理且可確保某種程度透 明性的聚乙烯樹脂、聚丙烯樹脂、聚笨乙烯樹脂、聚對苯 ，曱酸乙二醋樹脂等，並可將由此等之i種或2種以上成 形為單層或多層狀之膜作為保護膜使用。 就此等防護膜而言’I體上可列舉如在聚乙婦樹脂膜 320903 17 200946993 表面形成有黏著劑層之（恤_八化研股份有限公 司所販賣）、在對苯二甲酸乙二醋樹脂膜表面形成有點著劑 層之E-Mask (日泰带 、粟電工股份有限公司製）、在對笨二甲酸 乙二醋樹脂膜表面形成有黏著劑層之Mastaek (藤森 股份有限公司製）之市售品。 ^ 其中’以單獨即姆偏光膜具有黏著性之自我黏著性之 防護膜’由於不需保護防護膜表面之黏著劑層而為簡便， 故為更加適用_L述對偏光膜顯示較佳剝離力之自我黏著 性樹脂膜之市售品可列舉如由聚乙婦樹脂所構成之 Toretec ( Toray股份有限公司製）等。 ❹ 另外，保護膜係以魚眼（fisheye)等缺陷少者為佳。 若有缺陷’則其形狀會轉印至偏光膜，有時會因此而成為 偏光膜之缺陷。 _ 在本發明之偏光板之製造方法中，將偏光膜與保護膜 貼合後，為了去除水系接著劑中所含有之水，將積層臈乾 燥。可藉由連續通過經簡於適#溫度之乾燥爐而進行= 燥，例如，可藉由連續通過乾燥爐内並將乾燥後之偏光板❹ 捲取成輥狀而進行，但並不限定於此。本發明之偏光板之 製造方法之特徵係該乾燥步驟包含下述步驟：在溫度保持 於未違50°C之乾燥爐中滯留至其合計滯留時間為丨5〇秒以 上的低溫乾燥步驟；以及在溫度保持於5〇°c以上之乾燥爐 中滯留至其合計滯留時間為150秒以下的高溫乾燥步驟。 本發明中之低屋乾燥步驟，係在溫度保持於未達 °C之乾燥爐中滯留至合計滯留時間為150秒以上而進行乾 • 320903 18 200946993 燥的步驟。當低溫乾燥步驟中之乾燥溫度超過％ 於低溫乾鮮㈣轉在（此麵步驟會相當 步驟），絲製造之偏找上會_咖著之雜曲皿^ 件不同，有時會使偏光板無法保持板狀之型態而成^ 狀。若欲有效地抑料捲曲，職溫獅步射之=_ f較佳為桃以下。另外，從防止偏光膜與保護^^ 離之觀點來看，低溫乾燥步驟中之乾燥溫度較 = 上’更佳為40。(：以上。 〇Μ ❹ 低溫乾齡驟中之乾燥時間只要在i 5 q秒以上即可， 達15^1觀點來看，常為12GG秒以下。當乾燥時間未 之傾6 乂 ’在歷經高溫乾燥步驟時會有逆捲曲情形變大 d噴向。 ❹ 弋以）·卜於本發明中之馬溫乾燥步驟，係在溫度保持於50 驟。當中滞留至合計滯留時間為150秒以下的步 乾燥ϋΓ乙、步驟中之乾燥溫度未達5crc時’由於高溫 故若欲低溫乾燥步驟)， 生彦… 燥則需要長時間之乾燥，而有 曲的觀從防止因偏光膜收縮而造成明顯彎 下。”來看，面>皿乾燥步驟中之乾燥溫度較佳為6(rc以 但若欲才，燥步驟中之乾燥時間只要在i5G秒以下即可， 偏光柄以限之時間中進行乾燥’則會有因乾燥不足而使 勻之傾向’故通常為2°秒以上。當高溫乾 乾_間超過15〇秒時，會有逆捲曲情形變大 320903 19 200946993 之傾向。另外，當高溫乾燥步驟中之乾燥時間為〇秒時（亦 即高溫乾燥步驟不存在時），雖然不會發生逆捲曲，但由於 乾燥溫度低，若欲充分進行偏光板之乾燥則需要長時間之 乾燥，而有生產上之問題。 在本發明之偏光板之製造方法中，低溫乾燥步驟及高 溫乾燥步驟可依此順序進行，亦可依相反之順序進行，亦 可依序組合複數次低溫乾燥步驟及高溫乾燥步驟。若最先 進行高溫乾燥步驟，則偏光板之光學特性，尤其是垂直之 色相會有容易變藍之傾向，故乾燥步驟係以低溫乾燥步驟 先進行為佳，尤以低溫乾燥步驟、高溫乾燥步驟、低溫乾 燥步驟之順序進行為更佳。另外，當進行複數次低温乾燥 步驟及高溫乾燥步驟時，上述乾燥時間係為各個低溫乾燥 步驟之合計時間、各個高溫乾燥步驟之合計時間。亦即， 如上所述，當以低溫乾燥步驟、高溫乾燥步驟、低溫乾燥 步驟之順序進行乾燥步驟時，低溫乾燥步驟之乾燥時間係 相當於最初之低溫乾燥步驟之乾燥時間與最後之低溫乾燥 步驟之乾燥時間的合計時間。 在本發明之偏光板之製造方法中，如上所述，由於乾 燥步驟包含低溫乾燥步驟及高溫乾燥步驟，故相較於以 往，可製造捲曲少之偏光板。在此，「偏光板之捲曲」係指 當在平面上設置偏光板時，偏光板呈現凸狀或凹狀之狀 態。所謂「逆捲曲」係指在平面上設置成使偏光膜側處於 下面且使保護膜侧處於上面時，呈現凸型之捲曲；另外， 表示其相反狀態之「正捲曲」係指在平面上設置成使保護 20 320903 200946993 膜侧處於下面且使偏光膜侧處於上面時，呈現凸型之捲曲。 偏光板之捲曲例如可如下述而測定。首先，從製造之 偏光板，以相對於吸收轴（MD方向）呈45。之角度裁切 出250mmx300mm之長方形之測定樣品，並於經管理成溫 度23°C±2°C、相對濕度5〇%±5%之環境下，靜置於平面上 1小時。然後’使已捲曲而呈凸狀之面在下，置於平面上， 在位於接近長方形樣品之TD方向（垂直於吸收軸之方向） 之對角線上的角部，測定偏光板與平面之距離，由於角部 ❹有2處，故以其平均值作為捲曲測定值。由於捲曲測定值 為偏光板角部與平面之距離’故偏光板相對於平面若不為 凹狀則會難以測定，捲曲值本身會測定為零或正值。當偏 光板呈現逆捲曲時’求出使保護膜侧在下面偏光膜侧在上 面並置於平面上時的捲曲值。相反地，偏光膜侧成為凸狀 且保護膜侧成為凹狀之狀態即稱為「順捲曲」。當為順捲曲 時’求出使成為凸狀之偏光膜在下面且使保護膜側在上面 ❹並置於平板上時的捲曲值。在本說明書中，逆捲曲時之捲 曲值係以負值表示，順捲曲時之捲曲值係以正值表示，惟 「捲曲情形大」時之大小係以捲曲值之絕對值作為基準。 若為逆捲曲且其絕對值大，則在將偏光膜面以與液晶 面板表面成為對合之方向（亦即從液晶面板來看，使保護 膜位於外側）經由黏著劑層等而使偏光板貼合於液晶面板 時’黏者劑層與液晶面板間有容易產生氣泡之傾向。由於 容易產生氣泡之逆捲曲之捲曲值通常為— 5mm左右，故本 發明所製作之偏光板為逆捲曲時’其捲曲值係以在〇至〜 320903 21 200946993 5mm之範圍内為佳。另外，在為順捲曲時，當以偏光模側 經由黏著劑層等而貼合於液晶面板等時’若從中央往周圍 播壓推廣，即可不混入氣泡等而進行貼合，因此，即使其 捲曲值大也不會造成大問題，而可充分容許至+ 20mm左 右。惟’本發明所製作之偏光板的狀態係僅在由聚乙烯醇 樹脂所構成之偏光膜之一侧貼合保護膜的狀態，並具有由 聚乙婦醇樹脂所構成之偏光膜容易收縮的性質，故幾乎不 顯示大之噸捲曲值。 本發明之偏光板之製造方法中之乾燥步驟所使用的 ❹ 乾燥爐’從使上述低溫乾燥步驟及高溫乾燥步驟適宜進行 之觀點來看，以使用乾燥溫度可設定成3〇至6〇〇c (更佳 為40至60°C )之範圍者為佳。亦即，可使用可設定成能 在低溫乾燥步驟之較佳乾燥溫度之下限值30。(：、與高溫乾 燥步驟之較佳乾燥溫度之上限值60°C之範圍内進行乾燥 的乾燥爐。如上所述，此係由於當上述溫度未達3(TC時， 偏光膜與保護膜之間有容易剝離之傾向，另外，當超過⑼ C時，有因偏光膜收縮而造成明顯彎曲之虞之故。乾燥爐❹ 中之積層膜之合計滯留時間可為例如超過15〇秒且在侧 秒以下’尤其是從生產性之觀點來看，以在⑺至的 之範圍内為更佳。 y 在本發明之偏光板之製造方法中，在上述 後，亦可於室溫或務高於室溫之溫度，例如2〇至 右之溫度以至_小時左右進行熟化㈣e)。熟 溫度一般係設定成低於乾燥時所採用之溫度。 320903 22 200946993 如此而獲得之偏光板，通常係在其至少一側形成黏著 劑層。當在偏光板之偏光膜面形成黏著劑層時，為達成該 目的而使用之黏著劑係以在23至8〇〇c之溫度範圍中皆具 有 0.15 至 iMPa 之貯藏彈性係數（storage eiastic m〇dulus) Ο200946993 J 'The method of knowing. In addition, it is also possible to use, for example, a film made of a cycloolefin resin which has been previously formed into a film, such as Escena (manufactured by Sekisui Chemical Co., Ltd.), SCA40 (manufactured by Sekisui Chemical Co., Ltd.), or ZEONOR film (manufactured by 〇ptes Co., Ltd.). Commercial products. The cyclomethine resin film may be uniaxially stretched or biaxially stretched. By extending, any phase difference can be imparted to the cycloolefin resin film. The stretching is usually carried out while continuously winding the film roll while being in the heating furnace, extending in the direction in which the rolls are traveling, in the direction perpendicular to the direction of progress, or in both directions. The temperature of the furnace is usually about from the glass transition temperature of the cycloolefin resin to the glass transition temperature + 100. (The range of the stretching. The stretching ratio is usually 11 to 6 times, preferably 1.1 to 3.5 times. The cycloolefin resin film is generally subjected to plasma treatment, corona on the surface adjacent to the polarizing film due to its poor surface activity. Surface treatment such as treatment, ultraviolet irradiation treatment, flame treatment, special treatment, etc. is preferred. Among them, plasma treatment and corona treatment which are relatively easy to perform are preferred. φ In addition, the present invention can be used as a protective film. For the cellulose acetate resin film, a commercially available product such as Fujitac TD80 (manufactured by Fuji Film Co., Ltd.), Fujitac TD80UF (manufactured by Fuji Film Co., Ltd.), Fujitac TD80UZ (manufactured by Fuji Film Co., Ltd.), and the like can be suitably used. Fujitac TD40UZ (manufactured by Fuji Film Co., Ltd.), KC8CX2M (manufactured by Konica Minolta Opto Co., Ltd.), KC4UY (manufactured by Konica Minolta Opto Co., Ltd.), etc. The surface of the cellulose acetate resin film can also be treated according to the use. Surface treatment such as glare treatment, hard coating treatment, antistatic treatment, anti-reflection treatment, etc. 15 320903 200946993 The liquid crystal layer can be formed by improving the viewing angle characteristics, and the cellulose resin film can be extended in order to impart a phase difference. Further, in order to improve the adhesion to the polarizing film, the cellulose acetate resin film is usually saponified. The saponification treatment may be carried out by immersing in a facial aqueous solution such as sodium hydroxide or potassium hydroxide. When the above-mentioned protective film is in a roll state, since the film has a tendency to adhere to each other easily, the roller is inclined. The end portion is subjected to uneven processing, or a ribbon is inserted at the end portion, or a protective film is bonded to form a roll. The thickness of the protective film is preferably thin, but if it is too thin, the strength is lowered. On the other hand, if it is too thick, there arises a problem that the transparency is lowered or the hardening time required after lamination is lengthened. Therefore, the appropriate thickness of the protective film is, for example, about 5 to 100 #m. Preferably, it is 10 to 80 // m, and more preferably 20 to 40 // m. In the method for producing a polarizing plate of the present invention, the polarizing film and the protective film are passed through a polyvinyl alcohol resin aqueous solution or a water-based two-liquid type. Amine ester emulsion When a cellulose acetate film prepared by hydrophilizing a contiguous surface with a polarizing film or the like is used as a protective film, the polyvinyl alcohol resin aqueous solution can be suitably used as a protective film. In the polyvinyl alcohol resin used as the adhesive, in addition to the vinyl alcohol homopolymer obtained by saponifying the polyvinyl acetate which is a homopolymer of vinyl acetate, for example, vinyl acetate is exemplified. A vinyl alcohol copolymer obtained by saponifying a copolymer with another monomer copolymerizable therewith, and a modified polyvinyl alcohol polymer obtained by partially modifying the hydroxyl groups. Additives such as a water-soluble epoxy compound, a trimeric amine compound, an oxidized cone compound, and a front compound may be added to the aqueous binder. When such a water-based adhesive is used, the resulting adhesive layer is usually one or less, and even if the cross section is observed by usual light = micromirror, the adhesive layer is actually observed.秘 Secrets and (4) It is difficult to determine the rhyme of the rhyme, which can be enumerated as follows: m is connected (4) uniformly applied to the partial _ and/or protective film 廿f surface', and the other film is superposed on the coated surface. It is bonded by a roller and dried. Typically, the adhesive is applied at a temperature of 15 to the temperature of the thief after conditioning. The bonding temperature is usually 15 to 30. (In the range of the polarizing film and the protective film, in order to protect the film from the opposite side of the film, the film may be adhered to the peeling film. For example, the film is formed on the fine side of the polarizing plate. In the case of the transfer layer, the protective film can be peeled off at the stage where it is not required. The peeling force between the protective film and the polarizing film is 〇〇1 to 5N/25mm, = preferably is 2N/25mm, more佳为〇.〇1至〇5匪匪. Stripping = force if it does not reach O.Oi Hall, because the adhesion between the polarizing film and the protective film is small, and the repulsion has a part (4) if the peeling force exceeds 5 N/25mm, it is difficult to peel off the protective film from the polarizing film. The material of the protective film can be made of polyethylene resin, polypropylene resin, polystyrene resin, which is easy to handle and can ensure a certain degree of transparency. Polyphenylene terephthalate, bismuth citrate resin, etc., and a film in which one or two or more of these types are formed into a single layer or a plurality of layers can be used as a protective film. For example, if an adhesive layer is formed on the surface of the polyethylene resin film 320903 17 200946993 (shirt_八化研股份) Co., Ltd. sells) E-Mask (made by Ritai Belt, Sutong Electric Co., Ltd.) with a small coating layer on the surface of the ethylene terephthalate resin film, on the surface of the ethylenediacetate resin film A commercially available product of Mastaek (manufactured by Fujimori Co., Ltd.) having an adhesive layer. ^ Among them, a self-adhesive protective film having an adhesive film alone is not required to protect the adhesive layer on the surface of the protective film. For the sake of simplicity, the commercially available product of the self-adhesive resin film which exhibits a good peeling force to the polarizing film is exemplified by Toretec (manufactured by Toray Co., Ltd.) which is composed of polyacetal resin. ❹ In addition, it is preferable that the protective film has a small defect such as a fisheye. If there is a defect, the shape is transferred to the polarizing film, which may cause a defect of the polarizing film. _ Polarizing light in the present invention In the method for producing a sheet, after the polarizing film and the protective film are bonded together, the layered crucible is dried in order to remove the water contained in the water-based adhesive, and can be dried by continuously passing through a drying oven which is simple in temperature. , For example, it can be carried out by continuously passing through the drying furnace and winding the dried polarizing plate 成 into a roll shape, but the invention is not limited thereto. The method for producing a polarizing plate of the present invention is characterized in that the drying step includes the following Step: a low-temperature drying step in which the temperature is maintained in a drying oven not exceeding 50 ° C until the total residence time is 丨 5 〇 seconds or more; and staying in the drying furnace where the temperature is maintained at 5 ° C or more to the total The high-temperature drying step with a residence time of 150 seconds or less. The low-temperature drying step in the present invention is carried out in a drying oven maintained at a temperature of less than ° C until the total residence time is 150 seconds or more to dry. • 320903 18 200946993 Step: When the drying temperature in the low-temperature drying step exceeds % at low temperature and dry (four), the step of silk production will be quite different. The polarizing plate cannot be maintained in a plate shape. If you want to effectively suppress the curl, the temperature lion step is =_ f is preferably below the peach. Further, from the viewpoint of preventing the polarizing film from being protected, the drying temperature in the low-temperature drying step is more preferably 40. (: Above. 〇Μ 干燥 Drying time in low temperature dry age can be as long as i 5 q seconds or more, up to 15^1 point of view, often less than 12GG seconds. When the drying time is not inclined 6 乂' in the history In the high-temperature drying step, there is a case where the reverse curling state becomes large and d is sprayed. ❹ · ·) The drying step of the horse temperature in the present invention is maintained at a temperature of 50 sec. When it is retained to the total residence time of 150 seconds or less, the drying temperature in the step is less than 5crc. 'If the temperature is high, it is required to be dried at a low temperature.】Shenyan... It takes a long time to dry, and there is a song. The view is prevented from causing a significant bend due to shrinkage of the polarizing film. "Look, the drying temperature in the surface drying step is preferably 6 (rc, but if desired, the drying time in the drying step can be as long as i5 G seconds or less, and the polarizing handle is dried in a limited time) There is a tendency to be uniform due to insufficient drying. Therefore, it is usually 2° or more. When the temperature is dry and dried for more than 15 seconds, there is a tendency that the reverse curl becomes larger 320903 19 200946993. In addition, when drying at a high temperature In the step, the drying time is leap seconds (that is, when the high-temperature drying step does not exist), although the reverse curl does not occur, since the drying temperature is low, if the drying of the polarizing plate is sufficiently performed, it takes a long time to dry, and In the manufacturing method of the polarizing plate of the present invention, the low-temperature drying step and the high-temperature drying step may be performed in this order, or may be performed in the reverse order, or may be combined with a plurality of low-temperature drying steps and high-temperature drying in sequence. If the high-temperature drying step is first performed, the optical characteristics of the polarizing plate, especially the vertical hue, tend to become blue, so the drying step is performed first in a low-temperature drying step. Preferably, the step of performing the low temperature drying step, the high temperature drying step, and the low temperature drying step is more preferably. In addition, when the plurality of low temperature drying steps and the high temperature drying step are performed, the drying time is the total time of each low temperature drying step, The total time of each high-temperature drying step, that is, as described above, when the drying step is performed in the order of the low-temperature drying step, the high-temperature drying step, and the low-temperature drying step, the drying time of the low-temperature drying step is equivalent to the initial low-temperature drying step. The total time of the drying time and the drying time of the final low-temperature drying step. In the method for producing a polarizing plate of the present invention, as described above, since the drying step includes a low-temperature drying step and a high-temperature drying step, it can be manufactured as compared with the prior art. Here, the "curl of the polarizing plate" refers to a state in which the polarizing plate is convex or concave when a polarizing plate is provided on a plane. The term "reverse curling" means that the surface is placed on the plane so that When the side of the polarizing film is below and the side of the protective film is on top, a convex curl is present; In addition, the "positive curl" indicating the opposite state means that the convex shape is curled when the film side is disposed on the plane and the film side is placed on the side of the polarizing film. The curl of the polarizing plate can be, for example, as follows. First, from the manufactured polarizing plate, a rectangular measurement sample of 250 mm x 300 mm was cut at an angle of 45° with respect to the absorption axis (MD direction), and managed to a temperature of 23 ° C ± 2 ° C, relative In an environment with a humidity of 5〇%±5%, place it on the surface for 1 hour. Then 'make the curled, convex surface below, on the plane, in the TD direction close to the rectangular sample (perpendicular to the absorption axis) In the corner of the diagonal line, the distance between the polarizing plate and the plane is measured. Since there are two corners, the average value is used as the curl measurement value. Since the curl measurement value is the distance between the corner of the polarizing plate and the plane. 'Therefore, the polarizing plate is difficult to measure if it is not concave with respect to the plane, and the curl value itself is measured to be zero or positive. When the polarizing plate exhibits reverse curl, the curl value when the protective film side is on the lower polarizing film side and placed on the plane is determined. On the other hand, the state in which the polarizing film side is convex and the protective film side is concave is called "smooth curl". When it is a smooth curl, the curl value when the polarizing film which is convex is formed below and the protective film side is placed on the upper surface and placed on the flat plate is determined. In the present specification, the curl value at the time of the reverse curl is represented by a negative value, and the curl value at the time of the curl is expressed by a positive value, but the magnitude of the "large curl condition" is based on the absolute value of the curl value. In the case of reverse curling and a large absolute value, the polarizing film is placed in a direction in which the surface of the liquid crystal panel is aligned with the surface of the liquid crystal panel (that is, the protective film is positioned outside from the liquid crystal panel), and the polarizing plate is applied via an adhesive layer or the like. When it is bonded to a liquid crystal panel, there is a tendency for air bubbles to easily occur between the adhesive layer and the liquid crystal panel. Since the curl value of the reverse curl which is likely to generate bubbles is usually about -5 mm, the polarizing plate produced by the present invention is reversely curled. The curl value is preferably in the range of 〇 to ～320903 21 200946993 5 mm. In addition, when the film is bonded to the liquid crystal panel or the like via the adhesive layer or the like, the film is spread from the center to the periphery, so that it can be bonded without being mixed with air bubbles or the like. A large curl value does not cause a big problem, but can be sufficiently tolerated to about +20 mm. The state of the polarizing plate produced by the present invention is a state in which the protective film is adhered only to one side of the polarizing film made of a polyvinyl alcohol resin, and the polarizing film composed of the polyethyl alcohol resin is easily shrunk. Nature, so almost no large tonnage curl value. The 干燥 drying furnace used in the drying step in the method for producing a polarizing plate of the present invention can be set to 3 〇 to 6 〇〇 c from the viewpoint of suitably performing the above-described low-temperature drying step and high-temperature drying step. The range of (more preferably 40 to 60 ° C) is preferred. That is, a limit value 30 which can be set to be lower than the preferred drying temperature in the low temperature drying step can be used. (:, a drying oven which is dried in a range of 60 ° C above the preferred drying temperature of the high-temperature drying step. As described above, this is because when the above temperature is less than 3 (TC, the polarizing film and the protective film) There is a tendency to be easily peeled off, and when it exceeds (9) C, there is a possibility of significant bending due to shrinkage of the polarizing film. The total residence time of the laminated film in the drying furnace may be, for example, more than 15 sec. The side seconds or less 'especially from the viewpoint of productivity, it is more preferably in the range of (7) to y. y In the method for producing a polarizing plate of the present invention, after the above, it may be at room temperature or high Curing at room temperature, for example, from 2 Torr to the temperature of the right to about _hour (4) e). The cooking temperature is generally set to be lower than the temperature used for drying. 320903 22 200946993 The polarizing plate thus obtained is usually An adhesive layer is formed on at least one side thereof. When an adhesive layer is formed on the surface of the polarizing film of the polarizing plate, the adhesive used for the purpose has a thickness of 0.15 to iMPa in a temperature range of 23 to 8 〇〇c. Storage elastic coefficient (storage eiastic m〇dulus) Ο
者為佳。通常之光學膜用途所使用之黏著劑，其貯藏彈性 係數僅為〇.lMPa左右，貯藏彈性係數高於此值之黏著劑 係適合用於偏光膜面。.藉由使黏著劑之貯藏彈性係數在上 述範圍内’即可將高溫環境下隨著偏光膜收縮而產生之尺 寸變化抑制成較小’而獲得良好之耐久性。黏著劑之貯藏 彈丨生係數可使用DYNAMIC ANALYZER RDA II =(RE〇METRIC公司製），將試驗片作為—㈣醜厚之 圓柱，並藉由作成1Hz之頻率而求得。 另-方面，就偏光板之保護膜面上所形成的黏著劑而 言^除了可使用上述貯_性係數高者以外，亦可無特別 =制地使用顯示比其低之貯藏彈性係數者，例如通常光學 j用之顯示O.IMPa左右或其以下之貯藏彈性係數的黏 -本發明所用之黏著劑可列舉如丙埽酸系、橡谬、 =、聚發氧（sm識〇、聚乙_樹脂等。另外，能 硬2型、熱硬化型等黏著劑亦尤其可作為上述藏, 數高之黏著劑使用。此等中，以明w 、τ 等優，丙烯酸系作為基礎聚合物々著=佳耐熱 丙烯醆丁酯、(甲基）丙烯酸乙 7口使用（甲基 % Q甲基）丙烯酸異辛黯 320903 23 200946993 (甲基）丙烯酸2-乙基己酯等（甲基）丙烯酸酯聚合物， ’ 或由此等（甲基）丙烯酸酯之2種以上所成之共聚合聚合 物。再者，此等聚合物中共聚合有極性單體。極性單體可 列舉如（曱基）丙烯酸、（曱基）丙烯酸2-羥基丙酯、（甲 基）丙烯酸羥基乙酯、（甲基）丙烯醯胺、（曱基）丙烯酸 Ν，Ν·二曱基胺基乙酯、（甲基）丙烯酸環氧丙酯等具有羧 基、羥基、醢胺基、胺基、環氧基等官能基之單體。 此等丙烯酸系黏著劑當然可單獨使用，但通常是與交 聯劑併用。交聯劑可例示如：屬於2價或多價之金屬鹽， 〇 且與羧基形成羧酸金屬鹽者；屬於多元胺化合物，且與羧 基形成醯胺鍵者；屬於聚環氧化合物或聚醇化合物，且與 羧基形成酯鍵者；屬於聚異氰酸酯化合物，且與羧基形成 醯胺鍵者等。其中，廣泛使用聚異氰酸酯化合物作為有機 系交聯劑。 「能量線硬化型黏著劑」係指具有受到紫外線或電子 線等能量線之照射而硬化的性質，且在照射能量線前亦具 Λ u 有黏著性而密著於薄膜等被著體，經能量線之照射會硬化 而具有可調整密著力之性質的黏著劑。能量線硬化型黏著 劑尤以使用紫外線硬化型黏著劑為佳。能量線硬化型黏著 劑一般以丙稀酸系黏著劑與能量線聚合性化合物作為主成 分。通常會更進一步調配交聯劑，又，亦可因應需要而調 配光聚合起始劑或光增感劑。 在黏著劑組成物中，除了上述聚合物及交聯劑以外， 為了調整黏著劑之黏著力、凝集力、黏性、彈性係數、玻 24 320903 200946993 璃轉移溫度等，亦可 之樹脂類、賦予點著性配屬於^然物或合成物 染料、顏料、消泡劍、府曰抗氧化劑、紫外線吸收劑、 添加劑。亦可更進人2制劑、光聚合起始劑等適當 黏著劑層。 ，3有微粒子而製成顯示光散射性之 黏著劑層之厚产 w ο 明之目的之薄型偏二至4〇"m為佳，但為了獲得本發 之範圍内，從期望佈及加工性、耐久性之特性 子之尺寸變==看： 發生-著性超出範圍等丨::::性下降’…則會容易 層之方法1'並二::偏方法中’形成黏著劑 祺面、保護膜而+制在偏光板之一側或兩侧（偏光 物之各成八的^該二者），塗佈含有包括上述基礎聚合 φ _氧以:之=形成黏著劑層後，將經施予 可名門“間隔物（separat〇r)積層而獲得；亦 面、二腊上形成㈣劑層後’轉印至偏光板之偏光膜 ”硬膜面、或該等二者並進行積層。此外，在偏井妬 =形成黏著劑層時，亦可因應需要而在偏光板之黏著劑層 少成面及黏著劑層的至少一方施予密著處理，例如電暈處 ’已形成之黏著劑層之表面通常是以經施予脫模 處理之間暍物薄膜所保護’並在將此偏光板貼合至液晶單 元或其他光學膜等之前，剝下該間隔物薄膜。 依本發明之製造方法所製造之偏光板，通常具有太… 320903 200946993 之輥材料或薄片（sheet)材料之型態，為了獲得所期望之 形狀與透過轴之偏光板，以具有銳利刀刃的裁切工具進行 切斷（tip cut)。因此，在經切斷而獲得之偏光板小片（tip ) 中，於外周端部中，偏光膜會產生往外部露出之狀態。 將此狀態之偏光板小片進行例如熱衝擊試驗等耐久 性試驗時，比起一般所使用之偏光板，亦即比起將偏光膜 之兩面以纖維素樹脂膜等予以保護之偏光板，有容易發生 剝離或破裂等不良情形之傾向。為了避免此等不良情形， 本發明所得之偏光板小片係以將外周端面藉由飛切法（fly cut method)等連續地切削者為佳。 (實施例） 以下，依據實施例而更詳細說明本發明，但本發明不 限定於此等例。例中，表示含量或使用量之「％」及「份」， 只要未特別標記，即為重量基準。 <實施例1> 將平均聚合度約2400、皂化度99.9莫耳％以上之厚 度75/zm之聚乙烯醇膜以乾式進行單軸延伸至約5倍，再 繼續保持緊繃狀態，並於60°C之純水中浸潰1分鐘後，於 碘/碘化鉀/水之重量比為0.1/5/100之水溶液中以28°C浸潰 60秒。然後，於碘化鉀/硼酸/水之重量比為10.5/7:5/100 之水溶液中以72°C浸潰300秒。繼而以10°C之純水洗淨5 秒後，以90°C乾燥180秒，而獲得使碘吸附配向於聚乙烯 醇中而成之偏光膜。 另外，在100份之水中，使經完全皂化之聚乙烯醇 26 320903 200946993 (Kuraray Poval 117H，Kuraray 股份有限公司製）3份、 經乙酿乙酿基改質之聚乙稀醇（Gohsefimer 200，曰本合 成化學工業股伤有限公司製）3份、氯化辞（jsjacalai Tesque 股份有限公司所販售）0.18份、乙二醛（Nacalai Tesque 股份有限公司所販售）1.4份溶解，而調製聚乙烯醇樹脂 接著劑。. 在先則所得之偏光膜之一面，經由上述接著劑，以夾 輥將經皂化處理之由三乙酸纖維素所構成之厚度仙“也之 ©薄膜（KCWY ’ Kcmica Minolta Opto股份有限公司製）予 以貼合。一邊使貼合物之張力保持於43〇N/m，一邊以 t乾燥Μ秒、以饥乾燥61秒、以抑乾燥ιΐ7秒、以 机乾燥118秒，而獲得偏光板。總之，是以未達$代之 溫度乾燥193秒（低溫乾燥步驟），以5〇。〇以上之溫度乾 燥117秒（高溫乾燥步驟）。 評估所得偏光板之捲曲值為Q 5mm(順捲曲），可身 =捲曲量小之偏光板。另外，在偏紐之表面無不句 情形。 / <實施例2至5及比較例1至5>It is better. In general, the adhesive used in the optical film application has a storage elastic modulus of only about l.1 MPa, and an adhesive having a storage elastic modulus higher than this value is suitable for the polarizing film surface. By making the storage elastic modulus of the adhesive within the above range, it is possible to suppress the dimensional change caused by the contraction of the polarizing film in a high-temperature environment to be small, and to obtain good durability. The storage of the adhesive can be obtained by using DYNAMIC ANALYZER RDA II = (manufactured by RE〇METRIC Co., Ltd.) as a (4) ugly cylinder and by calculating the frequency of 1 Hz. On the other hand, in the case of the adhesive formed on the protective film surface of the polarizing plate, in addition to the above-described high storage coefficient, it is also possible to use a storage elastic modulus which is lower than the display. For example, the viscosity of the storage elastic modulus of the optical display is usually about 0. IMPa or less. The adhesive used in the present invention may, for example, be propionic acid, rubber, =, polyoxygen (sm), polyethyl _ Resin, etc. In addition, an adhesive such as a hard type 2 or a thermosetting type can be used as the above-mentioned high-viscosity adhesive. In this case, acrylics are used as the base polymer. = good heat-resistant butyl butyl acrylate, (meth) acrylate 7 (methyl% Q methyl) acrylate isoindole 320903 23 200946993 (meth) acrylate 2-ethylhexyl ester and other (meth) acrylic acid a copolymer polymer, or a copolymerized polymer of two or more kinds of (meth) acrylates, etc. Further, these polymers are copolymerized with a polar monomer. The polar monomer may be exemplified by Acrylic acid, 2-hydroxypropyl (meth) acrylate, (methyl) Hydroxyethyl enoate, (meth) acrylamide, hydrazine (mercapto) acrylate, fluorenyl dimethyl methacrylate, glycidyl (meth) acrylate, etc., having a carboxyl group, a hydroxyl group, a decylamino group, a monomer having a functional group such as an amino group or an epoxy group. These acrylic adhesives may of course be used singly, but usually in combination with a crosslinking agent, and the crosslinking agent may, for example, be a metal salt of a divalent or polyvalent value. And forming a carboxylic acid metal salt with a carboxyl group; belonging to a polyamine compound and forming a guanamine bond with a carboxyl group; belonging to a polyepoxy compound or a polyalcohol compound, and forming an ester bond with a carboxyl group; belonging to a polyisocyanate compound, and The carboxyl group forms a guanamine bond, etc. Among them, a polyisocyanate compound is widely used as an organic crosslinking agent. The "energy ray-curable adhesive" is a property which is hardened by irradiation with an energy ray such as an ultraviolet ray or an electron beam, and is Before the irradiation of the energy ray, there is also an adhesive which adheres to a film such as a film and is hardened by irradiation with an energy ray, and has an adhesive property. The energy ray-curable adhesive is particularly It is preferred to use an ultraviolet curing adhesive. The energy ray-curing adhesive generally uses an acrylic acid-based adhesive and an energy ray-polymerizable compound as a main component. Usually, the crosslinking agent is further formulated, and may be formulated as needed. Photopolymerization initiator or photo-sensitizer. In the adhesive composition, in addition to the above polymer and cross-linking agent, in order to adjust the adhesive adhesion, cohesive force, viscosity, elastic modulus, glass 24 320903 200946993 Transfer temperature, etc., can also be used as a resin, imparting a point-matching property or a synthetic dye, a pigment, a defoaming sword, a house anti-oxidant, a UV absorber, an additive. A suitable adhesive layer such as a polymerization initiator, 3 is a microparticle to form a light-scattering adhesive layer, and a thin type is preferably 2 to 4 〇"m, but in order to obtain the hair In the range of the desired fabric, the dimensionality of the fabric and the durability of the product == see: occurrence-inability beyond the range, etc. ::::: Sexual decline '...will be easy to layer 1' and 2: : Partial method Adhesive agent surface, protective film + made on one side or both sides of the polarizing plate (the polarized matter is formed into two), the coating contains the above-mentioned basic polymerization φ _ oxygen to form a bond After the agent layer, it is obtained by applying a layered "separat〇r" layer; the surface layer, the (four) agent layer on the two waxes, the 'transfer film transferred to the polarizing plate', the hard film surface, or the like The two are layered together. Further, in the case of forming a pressure-sensitive adhesive layer, it is also possible to apply a close treatment to at least one of the adhesive layer of the polarizing plate and the adhesive layer as needed, for example, the formed adhesive layer at the corona. The surface is usually protected by a film of the film applied between the release treatments and the spacer film is peeled off before the polarizing plate is attached to the liquid crystal cell or other optical film or the like. The polarizing plate manufactured by the manufacturing method of the present invention usually has a shape of a roll material or a sheet material of 320903 200946993, in order to obtain a polarizing plate of a desired shape and a transmission axis, to have a sharp cutting edge. The cutting tool is tip cut. Therefore, in the polarizing plate tip obtained by cutting, the polarizing film is exposed to the outside in the outer peripheral end portion. When the polarizing plate of this state is subjected to a durability test such as a thermal shock test, it is easier than a polarizing plate which is generally used, that is, a polarizing plate which protects both sides of the polarizing film with a cellulose resin film or the like. There is a tendency to cause problems such as peeling or cracking. In order to avoid such a problem, the polarizing plate piece obtained by the present invention is preferably such that the outer peripheral end face is continuously cut by a fly cut method or the like. (Embodiment) Hereinafter, the present invention will be described in more detail based on examples, but the present invention is not limited thereto. In the example, the "%" and "parts" indicating the content or the amount used are based on weight unless otherwise specified. <Example 1> A polyvinyl alcohol film having an average polymerization degree of about 2400 and a saponification degree of 99.9 mol% or more and a thickness of 75/zm was uniaxially stretched to about 5 times in a dry manner, and then kept in a tight state, and then After immersing in pure water at 60 ° C for 1 minute, it was immersed in an aqueous solution of iodine/potassium iodide/water in a weight ratio of 0.1/5/100 at 28 ° C for 60 seconds. Then, it was immersed at 72 ° C for 300 seconds in an aqueous solution of potassium iodide / boric acid / water in a weight ratio of 10.5 / 7: 5 / 100. Then, it was washed with pure water of 10 ° C for 5 seconds, and then dried at 90 ° C for 180 seconds to obtain a polarizing film obtained by iodine adsorption to polyvinyl alcohol. In addition, in 100 parts of water, 3 parts of fully saponified polyvinyl alcohol 26 320903 200946993 (Kuraray Poval 117H, manufactured by Kuraray Co., Ltd.), modified polyethylene glycol (Gohsefimer 200, 3 parts of 曰本合成化学工业股伤有限公司), 0.18 parts of chlorination (sold by jsjacalai Tesque Co., Ltd.), 1.4 parts of glyoxal (sold by Nacalai Tesque Co., Ltd.) dissolved, and modulated Vinyl alcohol resin adhesive. On the surface of the polarizing film obtained in the first place, the saponified cellulose triacetate was used as a squeezing surface to form a film of the thickness of the film (KCWY 'Kcmica Minolta Opto Co., Ltd.) The polarizing plate was obtained by keeping the tension of the composition at 43 〇 N/m, drying it for t seconds, drying for 61 seconds, drying it for 7 seconds, and drying it for 118 seconds. , drying at 193 seconds (low temperature drying step) at a temperature less than $, drying at 117 seconds at a temperature above 5 ( (high temperature drying step). The curl value of the obtained polarizing plate was evaluated to be Q 5 mm (cis curl). It can be a polarizing plate having a small amount of curling. In addition, there is no case on the surface of the partial button. / <Examples 2 to 5 and Comparative Examples 1 to 5>
以下’如表1所示，組合低溫燥步 驟而製作偏光板，評估料^ 一乾W 述方法在接近TD方向之對角線上之 ^ 如上所述而意指為逆捲曲，無負號者(= 為順捲曲。比較例4、5者表示為「筒狀」，係指 320903 27 200946993 此等是以逆捲曲，亦即以偏光膜側成為内侧之狀態而捲成 筒狀之意。 [表1] mi Μ 堞 堞 mi 壊 m / / TD捲曲 (mm) UD 〇 〇 τ* LC ΙΟ I CO T* 〇 筒狀 筒狀 滯留時間（秒） P S CNI 卜 CM 卜 ο ▼Ή s r"4 00 rH 〇 C<l N 〇 Γ— C£> CO 卜 ς〇 CO g 糊 1 CO τ—< 295 LO σ> CM 00 卜 I 00 r"H C>3 CO r-^ § 卜 ς〇 CO Ο ο 第4段 00 τ*Η to τΗ § 叫 8 ο § Ο *—< 2§ t—e <D s ο i-H σ> CO 1·*^ § ο 1 § r-H 第3段 LO »—1 to 寸 Oft CO *—ί σ> CO v-l g g rH g r-< IO g τ—l cn CO σ> CO g σ> CO τ-Η s σ» CO rH 第2段 1-Hl <〇 ΙΛ LO § w 卜 LO LO S ΙΟ cn CO οα s 卜 s οα 第1段 寸 f—1 ο CD — CO irH m rH CO rH σ> CO CD 1-H § CD s <〇 e 1 避 滯留時間（秒） 乾燥iffiK CC) 滯留時間（秒） 乾燥酿CC) 滯留時間（秒） 乾燥酿m 滞留時間（秒) 乾燥臟cc) 滯留時間（秒） 乾燥謎CC) 滞留時間（秒） 乾燥酿ra 1滯留時間（秒）1 乾燥酿cc> 滞留時間（秒〉 纖酿cc) 滯留時間（秒） 乾燥溫度cc) 滯留時間（秒） 實施例1 實施例2 實施例3 實施例4 實施例5 比較例1 比較例2 比較例3 比較例4 比較例5 28 320903 200946993 •由表1可知，在貼合保護膜後之乾燥步驟中，若50 °C以上之滯留時間變長，則逆捲曲會變大，尤其如比較例 4、5所示，當乾燥步驟整體為50°C以上時，經裁切成250mm x300mm大小的偏光板會顯示呈筒狀之逆捲曲，相對於 此，若依據本發明而採用未達50°C之低溫乾澡步驟且同時 組合50°C以上之高溫乾澡步驟，即可製造捲曲情形小之偏 光板。 【圖式簡單說明】 © 第1圖係表示使螢光燈反射於產生不均勻之偏光板表 面時之狀態的圖。 【主要元件符號說明】 〇 ❹ 29 320903The following is as shown in Table 1. The polarizing plate is prepared by combining the low-temperature drying step, and the evaluation method is as follows: on the diagonal line close to the TD direction, as described above, it means reverse curl, and no negative sign (= In the case of Comparative Examples 4 and 5, it is referred to as "cylinder", and is referred to as 320903 27 200946993. This is a reverse crimping, that is, a state in which the polarizing film side is inside and rolled into a cylindrical shape. [Table 1 ] mi Μ 堞堞mi 壊m / / TD curl (mm) UD 〇〇τ* LC ΙΟ I CO T* 〇 cylindrical tube retention time (seconds) PS CNI 卜 卜 ο Ή s r"4 00 rH 〇C<l N 〇Γ—C£> CO ς〇CO g paste 1 CO τ—< 295 LO σ> CM 00 卜 I 00 r"H C>3 CO r-^ § ς〇 ς〇 CO Ο ο 4th paragraph 00 τ*Η to τΗ § 8 ο § Ο *—< 2§ t-e <D s ο iH σ> CO 1·*^ § ο 1 § rH 3rd paragraph LO »-1 To OOft CO *—ί σ> CO vl gg rH g r-< IO g τ—l cn CO σ> CO g σ> CO τ-Η s σ» CO rH 2nd segment 1-Hl <〇ΙΛ LO § w 卜 LO LO S ΙΟ cn CO οα s 卜 s οα 1st segment f-1 ο CD — CO irH m rH CO rH σ> CO CD 1-H § CD s <〇e 1 Avoidance time (seconds) Dry ifiK CC) Residence time (seconds) Dry brewing CC) Residence time (seconds) Dry brewing m Retention time (seconds) Dry dirty cc) Residence time (seconds) Drying puzzle CC) Residence time (seconds) Dry brewing ra 1 residence time (seconds) 1 Dry brewing cc> Staying time (seconds) Fiber cc) Residence time (seconds) Drying temperature cc) Residence time (seconds) Example 1 Example 2 Example 3 Example 4 Example 5 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 28 320903 200946993 • It can be seen from Table 1 that in the drying step after bonding the protective film, if the residence time at 50 ° C or more becomes longer, the reverse curl becomes larger, especially as shown in Comparative Examples 4 and 5, when the drying step is as a whole. When the temperature is 50 ° C or more, the polarizing plate cut into a size of 250 mm x 300 mm may exhibit a cylindrical reverse curl. In contrast, according to the present invention, a low temperature dry bathing step of less than 50 ° C is employed and 50 combinations are simultaneously combined. The high-temperature dry bathing step above °C can produce a small bias in the curling situation. Light board. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view showing a state in which a fluorescent lamp is reflected on a surface of a polarizing plate which generates unevenness. [Main component symbol description] 〇 ❹ 29 320903