200817794 九、發明說明 【發明所屬之技術領域】 本發明係關於在偏光子的單面將具有液晶化合物之塗 覆層的光學補償薄膜予以貼合的複合偏光板，及使用其之 液晶顯示裝置。本發明亦又關於製造上述構造之複合偏光 板的方法及製造其所用之光學補償薄膜的方法。詳言之， 係關於改善上述構造之複合偏光板或構成其之光學補償薄 膜之耐水性的技術。 【先前技術】 近年來，低消耗電力、低電壓動作、質量輕、薄型之 液晶顯示器已急速普及作爲行動電話、攜帶資訊終端、電 腦用之監視器、電視等之資料用顯示裝置。隨著液晶技術 的發展，已提案各式各樣型式的液晶顯示器，並且持續解 決回應速度和對比度、狹視野角之液晶顯示器的問題點。 液晶顯示器有TN ( Twisted Nematic :扭轉向列）、 STN ( Super Twisted Nematic :超扭轉向歹ij ) 、VA ([Technical Field] The present invention relates to a composite polarizing plate in which an optical compensation film having a coating layer of a liquid crystal compound is bonded to one surface of a polarizer, and a liquid crystal display device using the same. The present invention also relates to a method of manufacturing the composite polarizing plate of the above configuration and a method of producing the optical compensation film used therefor. More specifically, it relates to a technique for improving the water resistance of a composite polarizing plate or an optical compensation film constituting the above structure. [Prior Art] In recent years, liquid crystal displays having low power consumption, low voltage operation, light weight, and low thickness have been rapidly popularized as display devices for data such as mobile phones, portable information terminals, monitors for computers, and televisions. With the development of liquid crystal technology, various types of liquid crystal displays have been proposed, and the problems of liquid crystal displays that respond to speed and contrast and narrow viewing angles are continuously solved. The liquid crystal display has TN (Twisted Nematic), STN (Super Twisted Nematic), VA (
Vertical Alignment :垂直配向） 、IPS ( In-plane Switching :橫電場）等各式各樣的方式，但於此些方式中 ，因爲液晶分子爲具有相位差値所引起的漏光、和偏光板 中斜視時的軸角度不齊等，而分別存在成爲弱點之視野角 的狹窄方向（方位角）。作爲放大此類弱點視野角的方法 ，乃廣泛採用以相位差薄膜對於液晶元件和偏光板進行光 學補償的方法。如此之相位差薄膜或光學補償膜爲根據液 -5- 200817794 晶元件內之液晶的相位差値、配向方向、液晶分子的驅動 方式等，而改變最適之種類，故使用許多種類之物質。 此類相位差薄膜或光學補償薄膜之一者，爲於透明支 撐體上將液晶化合物塗層表現光學特性之類型者。通常， 於透明支撐體上塗佈液晶化合物而製作，但於許多情況， 爲了令此液晶化合物於某特定方向上配向，乃於透明支撐 體上預先形成配向膜。例如，於特開平9- 1 79 1 25號公報 (專利文獻1 )中，記載於透明支撐體上設置配向膜作成 附有配向膜的支撐體，並於此配向膜上設置圓盤性，化合 物所構成的光學異向層（光學補償層），作成光學補償薄 片。 配向膜的材質必須考慮配向特性和塗佈性、光學特性 、耐久性等而選擇適切的物質，特別由配向特性和塗佈性 方面而言，亦多選擇對於水頗無耐性的材料，換言之係由 親水性材料中選出。例如，於上述專利文獻1中，推薦以 聚乙烯醇作爲配向膜。配向膜和塗覆層以對於水無耐性之 材料所構成的情形中，於含有大量水分之環境下的耐久性 不足’例如，於闻溫•筒濕條件下液晶顯不器產生不適 。具體而言，於水的影響下，任一層喪失充分的密黏力時 ，經由構成偏光板之其他層的熱所造成的伸縮、和吸放濕 所造成之伸縮等之外部應力，則發生層間剝離和此層本身 的破壞。 若進一步詳細說明，發現於三乙醯纖維素等之纖維素 系樹脂所構成的透明支撐體上形成親水性的配向膜，再於 -6- 200817794 其上將形成液晶化合物之塗覆層的光學補償薄膜’接黏至 偏光子的單面，並且於偏光子的多面接黏通常之三乙醯纖 維素所構成之透明保護薄膜的偏光板’曝露於局溫筒濕條 件時，親水性的配向膜受到水分所影響，且於偏光板端部 配向膜與各層間的密黏力降低，故在透明支撐體/配向膜/ 液晶化合物之塗覆層的任一界面引起浮起，並且以此處爲 起點引起隧道狀的空隙往偏光板內部進行的現象。以下’ 將此種現象稱爲鑽隧道。圖5中，示出將發生鑽隧道之偏 光板的表面端部予以放大的照片。於此圖中，可知右側爲 偏光板之端，並且由此處成長出許多的隧道20。 〔專利文獻1〕特開平9- 1 79 1 25號公報 【發明內容】 (發明所欲解決之課題） 於是，本發明之課題爲在於纖維素系樹脂所構成之透 明支撐體上形成配向膜，再於其上形成液晶化合物之塗覆 層的光學補償薄膜、或者將此透明支撐體側貼合至偏光子 之複合偏光板中，即使此光學補償薄膜含有對於水之耐性 低之層時，亦可防止濕熱條件下之層間剝離和層破壞，並 且改良其耐水性。硏究之結果發現，對於此類對水耐性低 之構材施以紫外線照射處理，提高耐水性，取得不會發生 如上述不適之耐久性優良的複合偏光板，並且達到完成本 發明。 200817794 (解決課題之手段） 即’若根據本發明，則提供於纖維素系樹脂所構成之 透明支撐體上形成配向膜，再於其上形成液晶化合物之塗 覆層的光學補償薄膜，爲以其透明支撐體側貼合至偏光子 之單面而成的複合偏光板，此光學補償薄膜爲以裁斷成2 公分X5公分的長方形，並將液晶化合物的塗覆層作爲內側 ’以圓周爲5公分且高度爲2公分之圍成圓筒的狀態於60 °C溫水中浸漬60分鐘時所發生的氣泡密度爲未滿1〇〇個 /cm2般照射紫外線的複合偏光板。 於上述之複合偏光板中，光學補償薄膜爲如上述，將 2公分X5公分之長方形以液晶化合物之塗覆層爲內側般， 以圓周爲5公分且高度爲2公分之圍成圓筒的狀態於6〇t 溫水中浸漬60分鐘時所發生的氣泡密度爲60個/cm2以下 般施以紫外線照射處理爲佳。 於此複合偏光板中，於偏光子之光學補償薄膜貼合面 的反側面，貼合透明保護薄膜，則可將偏光子的兩面作成 保護的狀態。此情況之透明保護薄膜，以偏光子反側施以 表面處理爲佳。此透明保護薄膜例如以三乙醯纖維素等之 纖維素系樹脂所構成。 另一方面，光學補償薄膜中的配向膜，多以親水性之 樹脂所構成，例如’以聚乙烯醇系樹脂所構成。構成光學 補償薄膜之液晶化合物的塗覆層，可爲含有圓盤性液晶的 光學補償層。此光學補償層爲由具有圓盤性構造單位之液 晶化合物所構成之具有負的雙折射層，此圓盤性構造單位 -8 - 200817794 的圓盤面爲對於透明支撐體面傾斜，而圓盤性構造單位的 圓盤面與透明支撐體面所成之角度爲於光學補償層的厚度 方向上變化所構成。此時，圓盤性構造單位之圓盤面相對 於透明支撐體面所成之角度，於光學補償層之厚度方向中 隨著由光學補償層之透明支撐體側之距離增加而增加爲佳 〇 於構成光學補償薄膜之液晶化合物的塗覆層外側設置 感壓式接黏劑層，可貼合至液晶元件。 又’若根據本發明，則亦提供具備上述任一種複合偏 光板和液晶元件，並且於液晶元件的一面令上述的複合偏 光板以其光學補償薄膜側透過感壓式接黏劑層予以層合的 液晶顯示裝置。 更且’若根據本發明，亦提供如上述改善耐水性之複 合偏光板的製造方法，此方法爲於纖維素系樹脂所構成之 透明支撐體上形成配向膜，再於其上將形成液晶化合物之 塗覆層的光學補償薄膜，以其透明支撐體側貼合至偏光子 並製造複合偏光板時，關於前述光學補償薄膜，使用裁斷 成2公分X5公分之長方形，並以液晶化合物之塗覆層作爲 內側’以圓周爲5公分且高度爲2公分之圍成圓筒的狀態 於ό 0 C溫水中浸漬6 0分鐘時，以1 〇 〇個/ c m 2以上之密度 發生氣泡的素材’且對於此光學補償薄膜，以同一條件於 溫水中浸漬時發生氣泡的密度爲未滿丨〇〇個/cm2般對素材 照射紫外線’或者對前述光學補償薄膜貼合至偏光子後的 複合偏光板照射紫外線。 -9 - 200817794 又，若根據本發明，則亦提供使用於上述複合偏光板 之耐水性被改善之光學補償薄膜的製造方法，此方法爲關 於纖維素系樹脂所構成之透明支撐體上形成配向膜，再於 其上將形成液晶化合物之塗覆層的光學補償薄膜，對於使 用裁斷成2公分χ5公分之長方形，並以液晶化合物之塗覆 層作爲內側，以圓周爲5公分且高度爲2公分之圍成圓筒 的狀態於60°C溫水中浸漬60分鐘時，以1〇〇個/cm2以上 之密度發生氣體的素材，以同一條件於溫水中浸漬時發生 氣泡的密度爲未滿1 0 0個/ c m2般，照射紫外線。於此方法 中’一邊將光學補償薄膜的素材加熱一邊進行紫外線照射 爲更佳。 (發明之效果） 本發明之複合偏光板爲構成其的光學補償薄膜，即使 於含有親水性層，例如含有親水性配向膜之情形，亦可抑 制水分對其的影響，例如，將此複合偏光板放置於高溫高 濕之氛圍氣時，可防止其光學補償薄膜的層間剝離和層破 壞’更且可抑制其伴隨之鑽隧道的發生。配置此複合偏光 板的液晶顯示裝置，即使曝露於高溫•高濕條件下，亦可 保持安定的顯示品質。 又’根據本發明之複合偏光板的製造方法及光學補償 薄膜的製造方法’則可確實製造如上述改善耐水性的複合 偏光板、或使用其之耐水性已被改善的光學補償薄膜。 -10- 200817794 【實施方式】 以下，亦一邊參照適當圖面，一邊說明本發明之具體 的實施形態。本發明之複合偏光板之層構成例於圖1中以 剖面模式圖表示。圖1之（A )爲示出基本的層構成’此 複合偏光板爲於纖維素系樹脂所構成之透明支撐體3上形 成配向膜4，再於其上令形成液晶化合物之塗覆層5的光 學補償薄膜2，以其透明支撐體3側貼合至偏光子1之單 面所構成。於偏光子1之光學補償薄膜2貼合面之反側面 ，貼合透明保護薄膜7爲佳。又，如圖1之（B )所示般 ，此透明保護薄膜7爲其外側，即與偏光子1的反側，具 有表面處理層8爲佳。圖1之（B)，因爲除了於透明保 護薄膜7的外側設置表面處理層8以外，與圖1之（A ) 相同，故於（A )相同部分加以相同符號，並且省略重複 說明。於光學補償薄膜2之外側，即液晶化合物之塗覆層 5的表面，設置用以貼合至液晶元件的感壓式接黏劑層9 〇 首先，一邊參照圖1，一邊對於各層依序說明。 偏光子1爲透過具有指定方向之振動面的直線偏光， 並且吸收與其垂直方向具有振動面之直線偏光的光學元件 。具體而言，可列舉於聚乙烯醇系樹脂薄膜吸黏配向二色 性色素的薄膜。吸黏配向碘作爲二色性色素的碘系偏光子 、和吸黏配向二色性有機染料作爲二色性色素的染料系偏 光子均可使用。 構成光學補償薄膜2的透明支撐體3爲以纖維素系樹 -11 - 200817794 脂所構成。纖維素系樹脂具體而言可列舉二乙醯纖維素和 三乙醯纖維素等之乙醯纖維素系樹脂，其中一般使用三乙 醯纖維素。 於透明支撐體3上形成的配向膜4，多以親水性樹脂 所構成，特別一般爲以聚乙烯醇系樹脂所構成。聚乙烯醇 系樹脂例如亦可爲導入烷基等之改質聚乙烯醇。 通常，於透明支撐體3上形成此類親水性樹脂所構成 的塗覆層，並將其表面予以摩擦處理，作成配向膜4。 液晶性化合物之塗覆層5，例如亦有向列液晶爲傾斜 配向者（由新日本石油股份有限公司所販售的“NH Film” 等），但一般爲將含有圓盤性液晶的塗佈液予以塗覆，並 且配向的光學補償層。此光學補償層爲由具有圓盤性構造 單位之液晶性化合物所構成之具有負的雙折射層，其圓盤 性構造單位的圓盤面爲對於透明支撐體面傾斜，而此圓盤 性構造單位之圓盤面與透明支撐體面所成之角度爲於光學 補償層的厚度方向上變化爲佳。於此形態中，圓盤性構造 單位之圓盤面相對於透明支撐體面所成之角度，爲於光學 補償層之厚度方向中隨著由光學補償層之透明支撐體側的 距離增加而增加，所謂的混合配向亦爲有效。圓盤性構造 單位之圓盤面相對於透明支撐體面所成之角度，例如，以 5度〜5 0度左右之範圍由透明支撐體側依序增加的構造。 於透明支撐體上形成配向膜及圓盤性結晶之塗覆層的光學 補償薄膜具體例，可列舉由富士照相軟片（股）所販售之 “Wide Blue” Film (亦以 “WV Film”表現）等。 -12- 200817794 於偏光子1的另一面貼合的透明保護薄膜7，可使用 自以往所使用之任意的透明樹脂薄膜。例如，可使用聚嫌 烴、聚甲基丙烯酸甲酯、聚碳酸酯、聚對苯二甲酸乙二酯 、環狀烯烴系樹脂（原冰片烯系樹脂）等之薄膜、和三乙 醯纖維素和二乙醯纖維素等所代表之纖維素系樹脂的薄膜 。其中’較佳使用纖維素系樹脂，尤其以三乙醯纖維素之 薄膜。 於透明保護薄膜7之表面形成的表面處理層8，係用 以令偏光板應用於液晶顯示裝置時作爲顯示面側（辨視側 )，改良其物性所設置之層。 具體而言，可列舉用以改善表面之耐擦傷性等所設置 的硬塗層，用以防止外光回映和閃爍所設置的防眩層、用 以防止外光反射所設置的防止反射層，用以防止靜電發生 所設置的防止帶電層等。 硬塗層爲經由塗佈紫外線硬化型之硬塗樹脂，並且於 此處照射紫外線令其硬化的方法等則可設置。防眩層爲例 如塗佈已添加充塡劑的紫外線硬化型樹脂，並於此處照射 紫外線令其硬化，並且根據充塡劑出現凹凸的方法，令紫 外線硬化型樹脂以接觸浮雕模型的狀態照射紫外線，並且 硬化令凹凸出現的方法等則可設置。防止反射層爲經由令 金屬氧化物等以一層或數層澱積之方法等則可設置。又， 防止帶電層爲經由塗佈加入防止帶電劑的紫外線硬化型樹 脂，並於此處照射紫外線令其硬化之方法等則可設置。 於光學補償薄膜2的外側，即液晶化合物之塗覆層5 -13- 200817794 的表面，可設置用以貼合至液晶元件的感壓式接黏劑層9 。此感應式接黏劑層1 〇爲以丙烯酸系等之亦稱爲黏著劑 之感壓式接黏劑型式已知之黏著性樹脂所構成。 如上述所構成之複合偏光板中，如先前背景技術項所 說明般，曝露於高溫高濕條件時，配向膜，特別爲親水性 之配向膜受到水分影響，令配向膜與各層間的密黏力降低 ，故於透明支撐體/配向膜/液晶化合物之塗覆層的任一者 界面引起浮起，並且以此爲起點往偏光板內部進行隧道狀 之空隙的現象，即引起鑽隧道。若根據本發明者等人之調 查，於使用具有三乙醯纖維素薄膜所構成之透明支撐體上 形成聚乙烯醇系樹脂所構成的配向膜，再於其上形成圓盤 性液晶之塗覆層，以圓盤性液晶的圓盤面爲相對於透明支 撐體面傾斜，且此圓盤面與透明支撐體面所成之角度爲於 圓盤性液晶塗覆層之厚度方向中，隨著透明支撐體側之距 離增加而增加之構造之富士照相軟片（股）製之光學補償 薄膜“WV-SA”時，上述鑽隧道的發生顯著。 此類鑽隧道的發生認爲係起因於配向膜之聚乙烯醇系 樹脂的親水性，且其耐水性爲不充分爲其原因之一。於定 量性判斷此類耐水性低之構材的耐水性上，發現如下述之 方法爲有效的。 即，於圖2之（A )中以平面圖所示般，將對象薄膜 (光學補償薄膜）裁斷成2公分χ5公分之長方形。其次， 將此長方形，以液晶化合物之塗覆層爲內側般捲起，作成 圓周爲5公分且高度爲2公分的圓筒。此圍住之狀態於圖 -14- 200817794 2之（B )中以斜視圖表示。以圍住狀態接合的 (寬2公分之二個端部爲接合時）1〇，以接黏 以固定。以此狀態於60 °C之溫水中浸漬60分鐘 此時，耐水性差的樣品中，發生許多氣泡。 氣泡的原因爲水令三乙醯纖維素/配向膜/液晶塗 密黏力降低，故於層間發生浮起。因此，若爲對 性高的光學補償薄膜，則頗不會發生此類氣泡。 於如上述之溫水浸漬試驗中發生許多氣泡， 差的光學補償薄膜，其後，以通常之步驟貼合至 作成複合偏光板之情形中，於高溫高濕條件下， 剝離發生隧道狀之浮起和剝落的可能性爲非常高 爲了改善溫水浸漬試驗中發生許多氣泡的現 提高光學補償薄膜的耐水性，發現對此光學補償 紫外線照射處理則爲有效。於是，本發明中，對 系樹脂所構成之透明支撐體3上形成配向膜4， 形成液晶化合物之塗覆層5的光學補償薄膜2， 水性不夠充分的光學補償薄膜2，施以紫外線照 則可改善此光學補償薄膜2的耐水性。 圖3中，示出將如上述溫水浸漬試驗中發生 的光學補償薄膜表面，以倍率約1 0倍的放大鏡 燈觀察時的照片。又，於圖4中，示出將溫水浸 幾乎完全未發生氣泡的光學補償薄膜表面，以仓 倍的放大鏡罩以螢光燈觀察時的照片。光學補償 爲透明，故由任一側察看均觀察到氣泡，圖3及 樣品端部 P帶12予 〇 發生此類 覆層間之 於水之耐 且耐水性 偏光子， 經由層間 〇 象，並且 薄膜施以 於纖維素 再於其上 特別爲耐 射處理， 許多氣泡 罩以螢光 漬試驗中 姜率約10 薄膜本身 圖4的照 -15- 200817794 片爲由透明支撐體側所觀察者。 其後，如上述於6 0 °C之溫水中浸漬6 0分鐘後，由溫 水中取出，並觀察光學補償薄膜之表面時，以1〇〇個/cm2 以上之密度發生氣泡的光學補償薄膜，將其貼合至偏光子 作成複合偏光板之情形中，若將高溫高濕條件下經由光學 補償薄膜的層間剝離易發生鑽隧道，且氣泡的密度降低， 則難發生此類鑽隧道。於是，於上述所示之溫水浸漬試驗 中以1 00個/cm2以上之密度發生氣泡時，判定爲耐水性低 者，且於相同之溫水浸漬試驗中僅以未滿100個/cm2之密 度發生氣泡時，判定爲耐水性高者。耐水性高之基準爲發 生氣泡的密度爲60個/cm2以下爲更佳。 用以改善光學補償薄膜之耐水性的紫外線照射處理時 機爲接黏至偏光子前，即，即使對光學補償薄膜本身照射 紫外線亦無妨，且於作成複合偏光板後予以紫外線照射處 理亦可。紫外線照射爲由光學補償薄膜之液晶塗覆層側進 行爲佳。因此，作成複合偏光板後進行紫外線照射之情況 ，亦由光學補償薄膜之液晶塗覆層側照射爲佳。此處所謂 之紫外線照射’係意指照射至少於波長2 0 0〜4 0 0 n m範圍內 具有發光的紫外線，且所使用之光源例可列舉高壓水銀燈 和熔合燈等。又，即使於室溫下照射紫外線，亦可令積算 光量增多至某程度且取得充分效果。但是，於加熱下照射 紫外線者此效果較高，且即使減少積算光量亦可取得充分 的效果。以滾筒處理時，若考慮生產性等，則以處理時間 短者較有利，於4 0 °C〜1 5 0 °C之氛圍氣下以低積算光量照射 -16- 200817794 紫外線爲佳。又，若未過度進行紫外線照射，則亦有發生 著色和分解缺點的可能性，故由儘可能減低積算光量的觀 點而言，亦以加熱下照射紫外線的手法可稱爲較佳。 紫外線照射中的積算光量爲10〜l，500mJ/cm2左右之 範圍’故配合視需要進行的加熱溫度和所得耐水性的水準 ，適當決定即可。 經由紫外線照射處理提高耐水性的理由，例如，認爲 因爲提高配向膜和塗覆層的交聯度，故對於水變成難溶， 但詳細理由仍未查明。 如上述於本發明中，若改以參照圖1予以說明，則關 於纖維素系樹脂所構成之透明支撐體3上形成配向膜4， 再於其上形成液晶化合物之塗覆層5的光學補償薄膜2， 以其透明支撐體3側貼合至偏光子單面而成的複合偏光板 ’此光學補償薄膜2爲裁斷成2公分χ5公分之長方形，並 以液晶化合物之塗覆層5作爲內側，以圓周爲5公分且高 度爲2公分之圓筒圍住的狀態（參照圖2 )於60 °C之溫水 中浸漬60分鐘時發生的氣泡密度爲未滿1〇〇個/cm2般照 射紫外線所構成。 將圖1所示之複合偏光板與液晶元件組合作成液晶顯 示裝置上，以光學補償薄膜2側，透過感壓式接黏劑層9 貼合至液晶元件。 又’根據本發明之方法製造複合偏光板上，將纖維素 系樹脂所構成之透明支撐體3上形成配向膜4，再於其上 形成液晶化合物之塗覆層5的光學補償薄膜2，以其透明 -17- 200817794 支撐體3側貼合至偏光子1製造複合偏 學補償薄膜2，使用裁斷成2公分χ5公 液晶化合物的塗覆層5作爲內側，以圓 爲2公分之圍成圓筒的狀態（參照圖2 浸漬60分鐘時，以1〇〇個/ cm2以上之 材’並且相對於此光學補償薄膜，以同 漬時發生氣泡的密度爲未滿100個/cm2 外線或者對此光學補償薄膜貼合至偏光 照射紫外線。於施行如此的照射紫外線 提高複合偏光板的耐水性，特別於高溫 的耐性。 又’根據本發明之方法製造光學補 維素系樹脂所構成之透明支撐體3上形 其上形成液晶化合物之塗覆層5的光學 裁斷成2公分χ5公分之長方形，並以液 5作爲內側，以圓周爲5公分且高度爲 的狀態（參照圖2 )於6 0 °C之溫水中浸 100個/cm2以上之密度發生氣泡的素材 水中浸漬時發生氣泡的密度爲未滿1〇〇 外線。施行如此之紫外線照射處理，則 膜的耐水性。 此紫外線照射爲一邊將上述光學補 一邊進行爲佳。此時之加熱爲於4(TC以 度下進行爲佳，更且以採用60°C以上、 光板時，關於其光 分之長方形，並以 周爲5公分且高度 )於60°C之溫水中 密度發生氣泡的素 一條件於溫水中浸 般，對素材照射紫 子後的複合偏光板 照射處理下，則可 局濕條件中曝露時 償薄膜上，關於纖 成配向膜4，再於 補償薄膜2，對於 晶化合物的塗覆層 2公分之圍成圓筒 漬60分鐘時，以 ，以同一條件於溫 個/cm2般，照射紫 可提高光學補償薄 償薄膜之素材加熱 上1 5 0 °C以下之溫 1 2 0 °C以下之溫度 -18- 200817794 爲更佳。 〔實施例〕 以下’示出實施例進一步具體說明本發明，但本發明 不被此些例所限定。 〔實施例1〕 由富士照相軟片（股）所取得之“WV-SA”（商品名） 爲於三乙醯纖維素薄膜的單面形成聚乙烯醇系樹脂所構成 的配向膜’並於其上塗覆圓盤性液晶所構成的光學補償薄 膜。若由此薄膜切出2公分χ5公分之長方形，並以其液晶 塗覆層作爲內側且以圖2所示形態之圍住狀態，並於6 〇艺 之溫水中浸漬6 0分鐘，則以約2 3 0個/ c m2之密度發生氣 泡，確認耐水性差。以其作爲素材，對其液晶塗覆層側， 使用日本電池（股）製之紫外線照射裝置“ U v 9 〇 5 6，，於室溫 下照射紫外線。照射之光源爲使用高壓水銀燈，且積算光 量爲900mJ/cm2。紫外線照射後再以同上之方法評價耐水 性時’氣泡的發生數爲減少至約20個/cm2，確認耐水性 爲提局。 另外’準備由碘染色聚乙烯醇延拉薄膜所構成的偏光 子。於此偏光子的單面’將上述紫外線照射處理之附有光 學補償機能的薄膜，以其三乙醯纖維素薄膜側透過接黏劑 接黏，並於偏光子的另一面，將單面具有表面處理層之下 列四種三乙醯纖維素薄膜分別以三乙醯纖維素側（未設置 -19- 200817794 表面處理層之側）透過接黏劑接黏，作成複合偏光板。 (1 )單面設置防眩層的三乙醯纖維素薄膜（商品名 :“DTAC AG UV80 H-3”，大日本印刷（股）製）， (2)單面設置防眩層之另外的三乙醯纖維素薄膜（ 商品名：“DTAC AG5 UV80 H-13”，大日本印刷（股）製 )， (3 )單面以蒸鑛設置防止反射層的三乙醯纖維素薄 膜（商品名：“HT-ARPSMC”、凸版印刷（股）製）， (4 )單面設置清淨硬塗覆層的三乙醯纖維素薄膜（ 商品名：“80CHC”，凸版印刷（股）製）。 更且，於構成此複合偏光板之光學補償薄膜的液晶塗 覆層側，設置丙烯酸系之感壓式接黏劑（Lintech (股）製 之“P2 3 6 JP”）層，製作附有感壓式接黏劑層之複合偏光板 。將此附有感壓式接黏劑層之複合偏光板，以吸收軸方向 相對於長邊以半時鐘回轉45 °之角度，以對角約 8吋（ 200mm)之尺寸切成小片後，貼合至1.1mm厚之玻璃板， 並以溫度50°C，壓力5氣壓之條件進行20分鐘之加壓處 理後放置24小時。其次投入溫度65 °C、相對濕度90%的 高溫高濕烤爐，65小時後取出樣品觀察外觀時，使用設置 表面處理層之四種三乙醯纖維素薄膜的任一種均未發生剝 落和浮起等不良。 〔實施例2〕 對於實施例1所用相同之光學補償薄膜“WV-SA”的素 -20- 200817794 材，一邊加熱一邊照射紫外線。即，將此薄膜安裝至調整 至9 0 °C的加熱板上之後，使用實施例1所用之相同的紫外 線照射裝置，以積算光量爲50mJ/cm2由液晶塗覆層側進 行紫外線照射。紫外線照射後以實施例1相同之方法評價 耐水性時，確認以溫水試驗完全無氣泡發生，且耐水性高 〇 使用此紫外線照射處理的光學補償薄膜，同實施例Ϊ 製作附有感壓式接黏劑層之複合偏光板，並以同樣之方法 進行高溫高濕試驗。其結果，未發生剝落和浮起等之不良 〔比較例1〕 將實施例1所用相同之光學補償薄膜“WV-SA”之素材 就其原樣，未予以紫外線照射處理供使用，其他爲同實施 例1處理，製作附有感壓式接黏劑層的複合偏光板，並以 同樣之方法進行高溫高濕試驗。其結果，於光學補償薄膜 “WV-SA”的層間產生浮起，發生圖5所例示的鑽隧道。 〔參考例〕 使用與實施例2所用之素材不同批次，以溫水試驗之 氣泡的發生密度爲約3 00個/cm2的“WV-S A ”素材，根據實 施例2，令光學補償薄膜加熱之加熱板的設定溫度和紫外 線照射之積算光量變化時之以溫水浸漬試驗後所觀察的氣 泡數（個/cm2 )整理於表1。 •21 - 200817794 〔表1〕 令加熱溫度與積算光量變化時之溫水浸漬試驗後的氣泡數 (個 /cm2) 紫外線照射之積算光量 未照射 300mJ/cm2 600mJ/cm2 900mJ/cm2 300 加熱板之設定溫度 25〇C 300 180 30 60°C 6 6 4 【圖式簡單說明】 圖1爲示出本發明之複合偏光板之構成例的剖面模式 圖。 圖2爲光學補償薄膜於溫水試驗時之長方形樣品的平 面圖（A )、和將此長方形樣品於溫水中浸漬而以圍住狀 態表示的斜視圖（B )。 圖3爲示出紫外線照射前之光學補償薄膜於溫水試驗 時之表面狀態的照片。 圖4爲示出以溫水試驗幾乎完全未察見氣泡之光學補 償薄膜之表面狀態的照片。 圖5爲將發生鑽隧道之偏光板表面端部予以攝影的參 考照片。 【主要元件符號說明】 1 :偏光子 2 :光學補償薄膜 -22- 200817794 3 :透明支撐體 4 :配向膜 5 :液晶化合物之塗覆層 7 :透明保護薄膜 8 :表面處理層 9 :感壓式接黏劑層 1 〇 :光學補償薄膜捲起時的端部 1 2 :固定端部的接黏膠帶 20 :鑽隧道 -23«Vertical Alignment, IPS (In-plane Switching), and the like, but in these modes, liquid crystal molecules are leaky due to phase difference 和, and squint in polarizing plate When the axis angles are not uniform, the narrow direction (azimuth angle) of the viewing angle of the weak point exists. As a method of amplifying the viewing angle of such a weak point, a method of optically compensating a liquid crystal element and a polarizing plate with a retardation film is widely used. Such a retardation film or an optical compensation film is used in many types depending on the phase difference 液晶 of the liquid crystal in the liquid crystal element, the alignment direction, and the driving mode of the liquid crystal molecules. One of such retardation films or optical compensation films is one in which the liquid crystal compound coating exhibits optical characteristics on a transparent support. Usually, a liquid crystal compound is applied to a transparent support, but in many cases, an alignment film is formed on the transparent support in order to align the liquid crystal compound in a specific direction. Japanese Patent Publication No. Hei 9-1791 25 (Patent Document 1) discloses that an alignment film is provided on a transparent support to form a support having an alignment film, and a disc-shaped compound is provided on the alignment film. The optically anisotropic layer (optical compensation layer) is formed to form an optical compensation sheet. The material of the alignment film must be selected in consideration of alignment characteristics, coating properties, optical properties, durability, etc., and in particular, in terms of alignment characteristics and coating properties, materials which are relatively resistant to water, in other words, are selected. Selected from hydrophilic materials. For example, in the above Patent Document 1, it is recommended to use polyvinyl alcohol as an alignment film. In the case where the alignment film and the coating layer are composed of a material resistant to water, the durability in an environment containing a large amount of moisture is insufficient. For example, the liquid crystal display device is uncomfortable under the conditions of temperature and tube wetness. Specifically, under the influence of water, when any layer loses sufficient adhesion, the external stress caused by the heat of the other layers constituting the polarizing plate and the expansion and contraction caused by moisture absorption and desorption occur between the layers. Peeling and destruction of the layer itself. As will be described in more detail, it is found that a hydrophilic alignment film is formed on a transparent support composed of a cellulose resin such as triacetonitrile cellulose, and an optical layer of a coating layer of a liquid crystal compound is formed thereon on -6-200817794. The compensation film is adhered to one side of the polarizer, and the polarizing plate of the transparent protective film formed by the multi-facet bonding of the polarizer is usually exposed to the wet condition of the local temperature cylinder, and the hydrophilic alignment The film is affected by moisture, and the adhesion between the alignment film at the end of the polarizing plate and each layer is lowered, so that floating at any interface of the transparent support/alignment film/liquid crystal compound coating layer, and here A phenomenon in which a tunnel-like void is caused to the inside of the polarizing plate as a starting point. The following 'refers to this phenomenon as a drill tunnel. Fig. 5 is a photograph showing an enlarged surface end portion of a polarizing plate in which a tunnel is drilled. In the figure, it is understood that the right side is the end of the polarizing plate, and a large number of tunnels 20 are grown therefrom. [Problem to be Solved by the Invention] The object of the present invention is to form an alignment film on a transparent support composed of a cellulose resin. Further, an optical compensation film on which a coating layer of a liquid crystal compound is formed, or a composite polarizing plate having the transparent support side attached to a polarizer, even if the optical compensation film contains a layer having low resistance to water, It can prevent interlayer peeling and layer breakage under moist heat conditions, and improve its water resistance. As a result of the investigation, it has been found that such a material having low water resistance is subjected to ultraviolet irradiation treatment to improve water resistance, and a composite polarizing plate excellent in durability which does not cause the above discomfort is obtained, and the present invention has been completed. 200817794 (Means for Solving the Problem) In the optical compensation film in which the alignment film is formed on the transparent support made of the cellulose resin and the coating layer of the liquid crystal compound is formed thereon, a composite polarizing plate having a transparent support side attached to one side of the polarizer, the optical compensation film being cut into a rectangle of 2 cm X 5 cm, and the coating layer of the liquid crystal compound is taken as the inner side with a circumference of 5 A composite polarizing plate which is irradiated with ultraviolet rays at a temperature of less than 1 //cm 2 when the state of being surrounded by a cylinder and having a height of 2 cm is immersed in warm water of 60 ° C for 60 minutes. In the above-mentioned composite polarizing plate, the optical compensation film is in a state in which a rectangular shape of 2 cm X 5 cm is formed inside the coating layer of the liquid crystal compound, and the circumference is 5 cm and the height is 2 cm. It is preferable to apply ultraviolet irradiation treatment to a bubble density of 60 pieces/cm2 or less when immersed in 6 〇t warm water for 60 minutes. In the composite polarizing plate, the transparent protective film is bonded to the opposite side of the optical compensation film bonding surface of the polarizer, and both sides of the polarizer can be protected. In this case, the transparent protective film is preferably surface-treated with the opposite side of the polarizer. This transparent protective film is made of, for example, a cellulose-based resin such as triacetyl cellulose. On the other hand, the alignment film in the optical compensation film is usually composed of a hydrophilic resin, for example, a polyvinyl alcohol resin. The coating layer of the liquid crystal compound constituting the optical compensation film may be an optical compensation layer containing a discotic liquid crystal. The optical compensation layer is a negative birefringent layer composed of a liquid crystal compound having a disc-shaped structural unit, and the disc surface of the disc-shaped structural unit -8 - 200817794 is inclined to the surface of the transparent support body, and the disc shape The angle formed by the disk surface of the structural unit and the surface of the transparent support body is changed in the thickness direction of the optical compensation layer. At this time, the angle formed by the disc surface of the disc-shaped structural unit with respect to the transparent support surface increases in the thickness direction of the optical compensation layer as the distance from the transparent support side of the optical compensation layer increases. A pressure-sensitive adhesive layer is disposed on the outer side of the coating layer of the liquid crystal compound of the optical compensation film, and can be bonded to the liquid crystal element. Further, according to the present invention, there is provided a composite polarizing plate and a liquid crystal element comprising any of the above, and the composite polarizing plate is laminated on the side of the liquid crystal element with the optical compensation film side through the pressure-sensitive adhesive layer. Liquid crystal display device. Further, according to the present invention, there is also provided a method for producing a composite polarizing plate which is improved in water resistance as described above, which comprises forming an alignment film on a transparent support composed of a cellulose resin, and then forming a liquid crystal compound thereon. When the optical compensation film of the coating layer is bonded to the polarizer on the side of the transparent support and the composite polarizing plate is manufactured, the optical compensation film is cut into a rectangle of 2 cm X 5 cm and coated with a liquid crystal compound. When the layer is immersed in ό 0 C warm water for 60 minutes in a state where the circumference is 5 cm in circumference and 2 cm in height, the material of the bubble is generated at a density of 1 〇〇 / cm 2 or more. In the optical compensation film, the density of the bubbles generated when immersed in warm water under the same conditions is such that the material is irradiated with ultraviolet rays less than 丨〇〇/cm 2 or the composite polarizing plate after the optical compensation film is attached to the polarizer is irradiated. Ultraviolet light. -9 - 200817794 Further, according to the present invention, there is provided a method for producing an optical compensation film which is improved in water resistance of the composite polarizing plate, wherein the method is to form an alignment on a transparent support composed of a cellulose resin. a film, and an optical compensation film on which a coating layer of a liquid crystal compound is formed, for a rectangular shape cut into 2 cm χ 5 cm, and a coating layer of a liquid crystal compound as an inner side, having a circumference of 5 cm and a height of 2 When the state of the cylinder is immersed in 60 ° C warm water for 60 minutes, the gas is generated at a density of 1 / / cm 2 or more, and the density of bubbles generated when immersed in warm water under the same conditions is less than 1 0 0 / c m2, irradiated with ultraviolet light. In this method, it is more preferable to perform ultraviolet irradiation while heating the material of the optical compensation film. (Effect of the Invention) The composite polarizing plate of the present invention is an optical compensation film constituting the same, and even when a hydrophilic layer is contained, for example, a hydrophilic alignment film is contained, the influence of moisture on it can be suppressed, for example, the composite polarization is performed. When the plate is placed in a high-temperature and high-humidity atmosphere, the interlayer peeling and layer damage of the optical compensation film can be prevented, and the accompanying drilling tunnel can be suppressed. The liquid crystal display device equipped with this composite polarizing plate can maintain stable display quality even when exposed to high temperature and high humidity conditions. Further, the method for producing a composite polarizing plate and the method for producing an optical compensation film according to the present invention can reliably produce a composite polarizing plate having improved water resistance as described above or an optical compensation film having improved water resistance. -10- 200817794 [Embodiment] Hereinafter, specific embodiments of the present invention will be described with reference to the appropriate drawings. The layer constitution example of the composite polarizing plate of the present invention is shown in a sectional view in Fig. 1. Fig. 1(A) is a view showing a basic layer constitution. The composite polarizing plate is formed by forming an alignment film 4 on a transparent support 3 composed of a cellulose resin, and then forming a coating layer 5 for forming a liquid crystal compound thereon. The optical compensation film 2 is formed by bonding the side of the transparent support 3 to one side of the polarizer 1. Preferably, the transparent protective film 7 is bonded to the opposite side of the bonding surface of the optical compensation film 2 of the polarizer 1. Further, as shown in Fig. 1(B), the transparent protective film 7 is preferably provided on the outer side thereof, i.e., on the opposite side of the polarizer 1, with the surface treatment layer 8. (B) of FIG. 1 is the same as that of FIG. 1(A) except that the surface treatment layer 8 is provided on the outer side of the transparent protective film 7, and the same reference numerals are given to the same portions in (A), and the overlapping description will be omitted. On the outer side of the optical compensation film 2, that is, the surface of the coating layer 5 of the liquid crystal compound, a pressure-sensitive adhesive layer 9 for bonding to the liquid crystal element is provided. First, referring to FIG. 1, the layers are sequentially described. . The polarizer 1 is an optical element that transmits linearly polarized light having a vibration plane having a specified direction and absorbs linearly polarized light having a vibration plane in a direction perpendicular thereto. Specifically, a film of a polyvinyl alcohol-based resin film which adsorbs and aligns a dichroic dye can be mentioned. A dye-based polarizer which is an iodine-based polarizer which adsorbs iodine as a dichroic dye and a dichroic dye as a dichroic dye can be used. The transparent support 3 constituting the optical compensation film 2 is composed of cellulose resin -11 - 200817794. Specific examples of the cellulose-based resin include acetaminophen-based resins such as diethyl phthalocyanine and triethyl hydrazine cellulose. Among them, triethylene phthalocyanine is generally used. The alignment film 4 formed on the transparent support 3 is usually composed of a hydrophilic resin, and is generally made of a polyvinyl alcohol-based resin. The polyvinyl alcohol-based resin may be, for example, a modified polyvinyl alcohol obtained by introducing an alkyl group or the like. Usually, a coating layer composed of such a hydrophilic resin is formed on the transparent support 3, and the surface thereof is subjected to rubbing treatment to form an alignment film 4. The coating layer 5 of the liquid crystal compound is, for example, a nematic liquid crystal which is an oblique alignment ("NH Film" sold by Nippon Oil Co., Ltd.), but generally includes a coating containing a discotic liquid crystal. The liquid is applied and the optical compensation layer is aligned. The optical compensation layer is a negative birefringent layer composed of a liquid crystalline compound having a disc-shaped structural unit, and the disc surface of the disc-shaped structural unit is inclined to the transparent support surface, and the disc-shaped structural unit The angle between the disc surface and the transparent support surface is preferably changed in the thickness direction of the optical compensation layer. In this form, the angle formed by the disc surface of the disc-shaped structural unit with respect to the transparent support surface increases in the thickness direction of the optical compensation layer as the distance from the transparent support side of the optical compensation layer increases. The mixed alignment is also effective. The angle formed by the disk surface of the disk-shaped structural unit with respect to the surface of the transparent support body is, for example, a structure in which the transparent support body side is sequentially increased in a range of about 5 to 50 degrees. Specific examples of the optical compensation film which forms the coating film of the alignment film and the disc crystal on the transparent support include "Wide Blue" Film (also referred to as "WV Film") sold by Fuji Photo Film Co., Ltd. )Wait. -12- 200817794 The transparent protective film 7 bonded to the other surface of the polarizer 1 can be any transparent resin film which has been used conventionally. For example, a film of polyacrylic acid, polymethyl methacrylate, polycarbonate, polyethylene terephthalate, cyclic olefin resin (original borneol resin), and triacetyl cellulose can be used. A film of a cellulose resin represented by cellulose or the like. Among them, a cellulose resin, particularly a film of triacetyl cellulose, is preferably used. The surface treatment layer 8 formed on the surface of the transparent protective film 7 is used as a display surface side (viewing side) when the polarizing plate is applied to a liquid crystal display device, and the layer provided by the physical properties is improved. Specifically, a hard coat layer provided to improve the scratch resistance of the surface, an anti-glare layer provided to prevent external light reflection and flicker, and an anti-reflection layer provided to prevent external light reflection may be cited. A charging prevention layer or the like provided to prevent static electricity from being generated. The hard coat layer can be provided by a method of applying a UV-curable hard coat resin, and irradiating it with ultraviolet rays to harden it. The anti-glare layer is, for example, an ultraviolet curable resin to which an anti-drying agent has been added, and is irradiated with ultraviolet rays to harden it, and the ultraviolet curable resin is irradiated in a state of contacting the relief model according to the method in which the anti-tacking agent is uneven. Ultraviolet rays, and methods of hardening to cause irregularities can be set. The antireflection layer can be provided by a method of depositing one or more layers of a metal oxide or the like. Further, the antistatic layer can be provided by a method in which an ultraviolet curable resin which is prevented from being charged by a coating, and which is irradiated with ultraviolet rays to harden it. On the outer side of the optical compensation film 2, that is, the surface of the coating layer of the liquid crystal compound 5-13-200817794, a pressure-sensitive adhesive layer 9 for bonding to the liquid crystal element may be provided. The inductive adhesive layer 1 is made of an adhesive resin known in the form of a pressure-sensitive adhesive type, which is also called an adhesive. In the composite polarizing plate constructed as described above, as described in the prior art, when exposed to high temperature and high humidity conditions, the alignment film, particularly the hydrophilic alignment film, is affected by moisture, and the alignment film and the layers are closely adhered. Since the force is lowered, the interface of any of the transparent support/alignment film/liquid crystal compound coating layer causes floating, and a tunnel-like void is formed inside the polarizing plate as a starting point, that is, the tunnel is caused to be drilled. According to the investigation by the inventors of the present invention, an alignment film composed of a polyvinyl alcohol-based resin is formed on a transparent support having a film of triacetyl cellulose, and a coating of a discotic liquid crystal is formed thereon. The layer is inclined with respect to the transparent support surface by the disk surface of the discotic liquid crystal, and the angle between the disc surface and the transparent support surface is in the thickness direction of the discotic liquid crystal coating layer, with transparent support When the optical compensation film "WV-SA" manufactured by Fuji Photo Film Co., Ltd., which has a structure in which the distance on the body side is increased, is increased, the occurrence of the above-described drilling tunnel is remarkable. The occurrence of such a tunnel is considered to be due to the hydrophilicity of the polyvinyl alcohol-based resin of the alignment film, and the water resistance is insufficient. In order to quantitatively judge the water resistance of such a member having low water resistance, it has been found that the following method is effective. That is, the target film (optical compensation film) was cut into a rectangular shape of 2 cm χ 5 cm as shown in plan view in Fig. 2 (A). Next, the rectangular shape was rolled up inside the coating layer of the liquid crystal compound to form a cylinder having a circumference of 5 cm and a height of 2 cm. The state of this enclosure is shown in a perspective view in (B) of Fig. -14-200817794. It is joined by a surrounding state (when the two ends of the width of 2 cm are joined), and is fixed by bonding. In this state, it was immersed in warm water of 60 ° C for 60 minutes. At this time, many bubbles occurred in the sample having poor water resistance. The reason for the bubbles is that the water causes the triacetonitrile cellulose/alignment film/liquid crystal coating to have a low adhesive strength, so that floating occurs between the layers. Therefore, if it is a highly optically compensated film, such bubbles do not occur. In the warm water immersion test as described above, a plurality of bubbles, a poor optical compensation film are generated, and thereafter, in the case of bonding to a composite polarizing plate in a usual step, the tunnel is floated under high temperature and high humidity conditions. The possibility of lifting and peeling is very high. In order to improve the water resistance of the currently improved optical compensation film in which many bubbles occur in the warm water immersion test, it is found to be effective for the optically compensated ultraviolet irradiation treatment. Therefore, in the present invention, the alignment film 4 is formed on the transparent support 3 composed of the resin, the optical compensation film 2 of the coating layer 5 of the liquid crystal compound is formed, and the optical compensation film 2 having insufficient water is applied, and the ultraviolet ray is applied. The water resistance of the optical compensation film 2 can be improved. Fig. 3 is a photograph showing the surface of the optical compensation film which occurred in the above-mentioned warm water immersion test, observed at a magnification of about 10 times. Further, Fig. 4 shows a photograph of the surface of the optical compensation film in which the warm water is immersed almost completely without bubbles, and the magnifying glass cover is observed with a fluorescent lamp. The optical compensation is transparent, so bubbles are observed from either side. Figure 3 and the end of the sample P-band 12 are resistant to water and water-resistant polarizers between the coatings, via interlayers, and the film The cellulose is applied to the cellulose and is particularly resistant to radiation. Many bubble masks have a ginger ratio of about 10 in the fluorescence test. The film itself is observed on the transparent support side as shown in Fig. Thereafter, after immersing in warm water of 60 ° C for 60 minutes, and taking out from the warm water, and observing the surface of the optical compensation film, an optical compensation film in which bubbles are generated at a density of 1 Å/cm 2 or more is obtained. In the case where it is bonded to a polarizer to form a composite polarizing plate, if the tunnel is easily formed by the interlayer peeling of the optical compensation film under high temperature and high humidity conditions, and the density of the bubbles is lowered, such a tunnel is difficult to occur. Then, when bubbles are generated at a density of 100 pieces/cm 2 or more in the warm water immersion test described above, it is judged that the water resistance is low, and in the same warm water immersion test, only less than 100 pieces/cm 2 are used. When the density is bubbled, it is judged that the water resistance is high. The basis for high water resistance is preferably a density of 60 bubbles/cm 2 or less. The ultraviolet irradiation treatment timing for improving the water resistance of the optical compensation film is before the adhesion to the polarizer, that is, even if the optical compensation film itself is irradiated with ultraviolet rays, and the composite polarizing plate is formed, and the ultraviolet irradiation treatment may be performed. Ultraviolet irradiation is preferable for the side effect of the liquid crystal coating layer of the optical compensation film. Therefore, it is preferable that the ultraviolet light is irradiated after the composite polarizing plate is formed, and the liquid crystal coating layer side of the optical compensation film is also irradiated. Here, the term "ultraviolet irradiation" means irradiating ultraviolet rays having a light emission in a range of at least a wavelength of from 20,000 to 4,000 nm, and examples of the light source to be used include a high-pressure mercury lamp and a fusion lamp. Further, even when ultraviolet rays are irradiated at room temperature, the amount of integrated light can be increased to a certain extent and a sufficient effect can be obtained. However, the effect of irradiating ultraviolet rays under heating is high, and a sufficient effect can be obtained even if the amount of integrated light is reduced. When it is treated with a roller, it is advantageous to use a low processing time in consideration of productivity, etc., and to irradiate light with a low total amount of light in an atmosphere of 40 ° C to 150 ° C -16-200817794. Further, if the ultraviolet ray is not excessively applied, there is a possibility that the coloring and the decomposition are disadvantageous. Therefore, it is preferable to use a method of irradiating the ultraviolet ray under heating by reducing the amount of integrated light as much as possible. The amount of light to be accumulated in the ultraviolet ray irradiation is in the range of about 10 to 1 and about 500 mJ/cm2. Therefore, it may be appropriately determined in accordance with the heating temperature and the level of the obtained water resistance. The reason why the water resistance is improved by the ultraviolet irradiation treatment is, for example, considered to be that the degree of crosslinking between the alignment film and the coating layer is increased, so that the water becomes poorly soluble, but the detailed reason has not been ascertained. As described above, in the present invention, an optical compensation for forming the alignment film 4 on the transparent support 3 made of the cellulose resin and forming the coating layer 5 of the liquid crystal compound thereon will be described with reference to FIG. The film 2 is a composite polarizing plate which is bonded to one side of the polarizer by the transparent support 3 side. The optical compensation film 2 is cut into a rectangle of 2 cm χ 5 cm, and is coated with the coating layer 5 of the liquid crystal compound. In a state surrounded by a cylinder having a circumference of 5 cm and a height of 2 cm (refer to FIG. 2), the bubble density when immersed in 60 ° C of warm water for 60 minutes is less than 1 //cm 2 . Composition. The composite polarizing plate shown in Fig. 1 is bonded to a liquid crystal element group to form a liquid crystal display device, and is bonded to the liquid crystal element through the pressure-sensitive adhesive layer 9 on the side of the optical compensation film 2. Further, in the method of the present invention, a composite polarizing plate is produced, an alignment film 4 is formed on a transparent support 3 composed of a cellulose resin, and an optical compensation film 2 of a coating layer 5 of a liquid crystal compound is formed thereon. The transparent -17-200817794 support body 3 side is bonded to the polarizer 1 to manufacture the composite bias compensation film 2, and the coating layer 5 cut into 2 cm χ 5 gong liquid crystal compound is used as the inner side, and the circle is rounded to 2 cm. The state of the cylinder (refer to FIG. 2 when immersed for 60 minutes, the material is 1 / / cm 2 or more and relative to the optical compensation film, the density of bubbles occurring at the same stain is less than 100 / cm 2 outer line or The optical compensation film is bonded to the polarized light to illuminate the ultraviolet ray, and the ultraviolet ray is applied to improve the water resistance of the composite polarizing plate, particularly the high temperature resistance. Further, the transparent support body made of the optical fullinic resin is produced according to the method of the present invention. 3 The optical shape of the coating layer 5 on which the liquid crystal compound is formed is cut into a rectangle of 2 cm χ 5 cm, and the liquid 5 is used as the inner side, and the circumference is 5 cm and the height is Fig. 2) The density of bubbles generated when immersed in water with a density of 100/cm2 or more in 60 °C warm water is less than 1 〇〇 outside line. The water resistance of the film is treated by such ultraviolet irradiation. It is preferable that the ultraviolet irradiation is performed while the optical compensation side is performed. The heating at this time is preferably 4 (TC is preferably performed at a degree, and more preferably 60 ° C or more, a light plate, a rectangle of the light division thereof, And in the temperature of 60 ° C in the temperature of the water at a temperature of 60 ° C in the temperature of the bubble - the conditions of the conditions in the warm water immersion, the composite polarizing plate after irradiation of the material after the irradiation of the purple plate, the exposure can be exposed to wet conditions On the compensation film, the fiber alignment film 4 and the compensation film 2 are irradiated with a cylindrical stain for 2 minutes of the coating layer of the crystalline compound, and irradiated under the same conditions at a temperature of /cm 2 . The purple color can increase the material of the optical compensation thin film to be heated at a temperature of 150 ° C or less and the temperature of 1 2 0 ° C or lower is preferably -18-200817794. [Embodiment] Hereinafter, the embodiment will be further described in detail. Invention, but the invention [Example 1] "WV-SA" (trade name) obtained from Fuji Photo Film Co., Ltd. is a polyvinyl alcohol-based resin formed on one side of a triacetone cellulose film. The alignment film is coated with an optical compensation film made of a discotic liquid crystal. If the film is cut into a rectangle of 2 cm to 5 cm, and the liquid crystal coating layer is used as the inner side and in the form shown in FIG. When it is immersed in the warm water of 6 〇艺 for 60 minutes, bubbles are formed at a density of about 260 / c m2, and it is confirmed that the water resistance is poor. It is used as a material on the liquid crystal coating layer side. Japanese battery (unit) UV irradiation device "U v 9 〇 5 6, irradiated with ultraviolet rays at room temperature. The light source for illumination was a high-pressure mercury lamp, and the integrated light amount was 900 mJ/cm2. When the water resistance was evaluated by the same method as above after the ultraviolet irradiation, the number of occurrences of the bubbles was reduced to about 20 pieces/cm2, and it was confirmed that the water resistance was a result. Further, a polarizer composed of an iodine-dyed polyvinyl alcohol film was prepared. On the one side of the polarizer, the film with the optical compensation function attached to the ultraviolet irradiation is adhered to the triethylene cellulose film side through the adhesive, and has one side on the other side of the polarizer. The following four kinds of triacetyl cellulose films of the surface treatment layer were respectively adhered to the triethylene cellulose side (the side of the surface treatment layer not provided with -19-200817794) to form a composite polarizing plate. (1) A triacetone cellulose film (trade name: "DTAC AG UV80 H-3", manufactured by Dainippon Printing Co., Ltd.) in which an antiglare layer is provided on one side, and (2) an additional antiglare layer on one side. Triethylene fluorene cellulose film (trade name: "DTAC AG5 UV80 H-13", manufactured by Dainippon Printing Co., Ltd.), (3) Triethylene fluorene cellulose film with a single side to prevent reflection layer from steaming (trade name) : "HT-ARPSMC", embossed (manufactured by the company), (4) A triacetyl cellulose film (trade name: "80CHC", manufactured by letterpress printing) having a clean hard coating layer on one side. Further, an acrylic pressure-sensitive adhesive ("P2 3 6 JP" made by Lintech Co., Ltd.) layer was provided on the liquid crystal coating layer side of the optical compensation film constituting the composite polarizing plate to produce a feeling of attachment. A composite polarizer of a pressure-sensitive adhesive layer. The composite polarizing plate with the pressure-sensitive adhesive layer is attached to the angle of the absorption axis at a half-clock rotation angle of 45° with respect to the long side, and is cut into small pieces at a diagonal angle of about 8 吋 (200 mm). The glass plate was placed to a thickness of 1.1 mm, and subjected to a pressure treatment at a temperature of 50 ° C and a pressure of 5 atm for 20 minutes, and then left for 24 hours. Next, a high-temperature and high-humidity oven with a temperature of 65 ° C and a relative humidity of 90% was introduced, and when the sample was taken out after 65 hours, the appearance of the three kinds of triacetyl cellulose films provided with the surface treatment layer was not peeled off and floated. It is not good. [Example 2] The element -20-200817794 of the same optical compensation film "WV-SA" used in Example 1 was irradiated with ultraviolet rays while being heated. Namely, after the film was mounted on a hot plate adjusted to 90 ° C, the same ultraviolet light irradiation device as used in Example 1 was used to irradiate the liquid crystal coating layer side with ultraviolet light at an integrated light amount of 50 mJ/cm 2 . When the water resistance was evaluated by the same method as in Example 1 after the ultraviolet irradiation, it was confirmed that the optical compensation film was completely bubble-free in the warm water test, and the water resistance was higher than that of the optical compensation film treated by the ultraviolet irradiation treatment. The composite polarizing plate of the adhesive layer was subjected to the high temperature and high humidity test in the same manner. As a result, there was no problem such as peeling and floating. [Comparative Example 1] The material of the same optical compensation film "WV-SA" used in Example 1 was used as it is, and was not subjected to ultraviolet irradiation treatment, and the other was carried out. In Example 1, a composite polarizing plate with a pressure-sensitive adhesive layer was prepared, and a high-temperature and high-humidity test was carried out in the same manner. As a result, floating occurs between the layers of the optical compensation film "WV-SA", and the drill tunnel illustrated in Fig. 5 occurs. [Reference Example] Using the different batches of the material used in Example 2, the bubble density of the warm water test was about 300 Å/cm 2 "WV-S A " material, and according to Example 2, the optical compensation film was used. Table 1 shows the number of bubbles (number/cm2) observed after the warm water immersion test when the set temperature of the heated hot plate and the integrated light amount of the ultraviolet ray were changed. • 21 - 200817794 [Table 1] The number of bubbles after the warm water immersion test when the heating temperature and the integrated light amount are changed (units/cm2) The integrated light amount of the ultraviolet irradiation is not irradiated 300mJ/cm2 600mJ/cm2 900mJ/cm2 300 heating plate Setting Temperature 25〇C 300 180 30 60°C 6 6 4 BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic cross-sectional view showing a configuration example of a composite polarizing plate of the present invention. Fig. 2 is a plan view (A) of a rectangular sample of the optical compensation film in the warm water test, and a perspective view (B) showing the rectangular sample immersed in warm water to surround the state. Fig. 3 is a photograph showing the surface state of the optical compensation film before ultraviolet irradiation in the warm water test. Fig. 4 is a photograph showing the surface state of the optical compensation film in which the bubble is almost completely absent in the warm water test. Fig. 5 is a reference photograph for photographing the end surface of the polarizing plate on which the tunnel is drilled. [Explanation of main component symbols] 1 : Polarizer 2 : Optical compensation film-22- 200817794 3 : Transparent support 4 : Alignment film 5 : Coating layer of liquid crystal compound 7 : Transparent protective film 8 : Surface treatment layer 9 : Pressure sensitive Adhesive layer 1 〇: End of optical compensation film when rolled up 1 2: Adhesive tape 20 at fixed end: Drill tunnel -23«