TW201030080A

TW201030080A - Optical film, method for producing optical film, polarizing plate and liquid crystal display device

Info

Publication number: TW201030080A
Application number: TW098133195A
Authority: TW
Inventors: Minori Tamagawa
Original assignee: Konica Minolta Opto Inc
Priority date: 2008-10-06
Filing date: 2009-09-30
Publication date: 2010-08-16
Also published as: WO2010041513A1; CN102171020B; KR20110086797A; JPWO2010041513A1; JP5397382B2; CN102171020A

Abstract

Disclosed is an optical film having improved moisture absorption, heat resistance and brittleness at the same time. The optical film rarely causes light leakage, and has good reworkability. Also disclosed are a method for producing the optical film, a polarizing plate and a liquid crystal display device. The optical film is characterized in that the film contains an acrylic resin (A) and a cellulose ester resin (13) at a mass ratio of from 95:5 to 30:70, that the acrylic resin CAD has a weight average molecular weight Mw of not less than 1 10,000 but not more than 1,000,000, that the total degree of substitution (I) of acyl groups of the cellulose ester resin (13) is not less than 2.0 but not more than 3.0, and the substitution degree of acyl groups having 3-7 carbon atoms is not less than 1.2 but not more than 3.0, that the cellulose ester resin (13) has a weight average molecular weight Mw of not less than 75,000 but not more than 300,000, that the film has a tension softening point of 105-145 DEG C℃ and a folding endurance of 50-100 times, and that the film is produced by melt casting.

Description

201030080 六、發明說明【發明所屬之技術領域】本發明係有關光學薄膜、光學薄膜之製造方法、偏光板及液晶顯示裝置，更詳細而言係有關不易產生漏光，再加工性良好的光學薄膜、偏光板及液晶顯示裝置。【先前技術】 Φ 液晶顯示裝置係在液晶電視及個人電腦之液晶顯示器等的用途方面，需求越來越大。通常，液晶顯示裝置係以玻璃板挾著透明電極、液晶層、彩色濾光片等的液晶胞與設置於其兩側之2片偏光板所構成，各自的偏光板係以2片光學薄膜（偏光板保護薄膜）挾著偏光鏡（也稱爲偏光鏡、偏光膜）所構成。此偏光板保護薄膜通常使用纖維素三乙酸酯薄膜。此外，因近年技術進步，使液晶顯示裝置加速大型 φ 化，同時液晶顯示裝置之用途也多樣化。例如可作爲被設置在街頭或店舖之大型顯示器使用或被用於使用被稱爲數字標示板之顯示機器之公共場所的廣告用顯示器等。這種用途係假設用於室外，因此，因偏光薄膜之吸濕而有造成劣化的問題，偏光板保護薄膜需要更高的耐濕性。但是以往使用的纖維素三乙酸酯薄膜等之纖維素酯薄膜，很難得到充分的耐濕性。爲了改善耐濕性的技術，例如提案丙烯酸樹脂組合耐衝擊性丙烯酸橡膠-甲基丙烯酸甲酯共聚物或丁基改性乙 -5- 201030080 醯基纖維素以60〜90/40-1 0之量比的方法（例如專利文獻 1)。但是此方法係丙烯酸樹脂薄膜所具有之容易龜裂易脆特性（脆性）明顯，薄膜製造時或再加工步驟之斷裂等，不易安定製造特別是大型液晶顯示裝置用之光學薄膜。又，聚甲基丙烯酸甲酯（以下簡稱爲PMMA)所代表的丙烯酸樹脂薄膜，一般缺乏耐熱性，且高溫下使用、長期的使用等有形狀改變的問題。此問題不僅是作爲薄膜單體的物性，而且對於使用這種薄膜的偏光板、顯示裝置也是重要的課題。換言之，液晶顯示裝置中，隨著薄膜的變形，偏光板會產生捲曲，因此產生面板整體變形的問題。薄膜變形所造成的問題不僅是在背光側，也發生在辨識側表面位置使用時。也提案對於纖維素酯薄膜，混合可塑劑或爲了控制光學特性而混合丙烯酸樹脂的技術（專利文獻2)。但是在此所揭示之丙烯酸樹脂的分子量較小，因此無法得到充分的耐濕性，在高濕環境下因偏光板劣化或光學薄膜之光學値變化等的問題而無法改善漏光。專利文獻3提案混合丙烯酸樹脂與纖維素酯樹脂，以熔融流延法製造的薄膜。此方法也無法充分改善脆性。專利文獻3中也記載添加可塑劑的例子，但是原有必要的耐熱性變差，無法同時具有脆性與耐熱性。 [先行技術文獻] [專利文獻] -6- 201030080 [專利文獻1]特開平5_119217號公報 [專利文獻2]特開2003-12859號公報 [專利文獻3]特開2008-88417號公報【發明內容】 [發明之槪要] ' [發明欲解決的課題] φ 本發明有鑑於上述課題，以提供可同時改善吸濕性、耐熱性及脆性的光學薄膜爲目的，此外以提供不易產生漏光’再加工性良好的光學薄膜、其製造方法、偏光板及液晶顯示裝置爲目的。 [解決課題的手段] 本發明之上述目的可藉由以下構成來達成。 1. 一種光學薄膜，其特徵係使丙烯酸樹脂（A)與纖維 φ 素酯樹脂（B)爲95 : 5〜30 : 70的質量比，前述丙烯酸樹脂 (A)之重量平均分子量Mw爲110000以上1000000以下，該纖維素酯樹脂（B)之醯基總取代度（T)爲2.0以上3.0以下，碳數爲3以上、7以下之醯基之取代度爲1.2以上 3.〇以下，該纖維素酯樹脂（B)之重量平均分子量Mw爲 75000以上300000以下，張力軟化點爲105〜145 °C，耐折度爲50〜1〇〇次，且藉由熔融流延製膜方法所製造者。 2. —種光學薄膜之製造方法，其特徵係前述第1項之光學薄膜爲在搬送方向或寬度方向之至少任一方向進行延 201030080 伸所製造者，該延伸溫度爲延伸前之光學薄膜之 Tg〜Tg + 50〇c^ ° 3. —種偏光板，其特徵係具有前述第1項之光學薄膜。 4. 一種液晶顯示裝置，其特徵係具有前述第3項之偏光板" 發明效果藉由本發明可提供同時改善吸濕性、耐熱性及脆性的光學薄膜，藉此可提供不易產生漏光，再加工性良好的光學薄膜、其製造方法、偏光板及液晶顯示裝置。 [實施發明之形態] 以下詳細說明實施本發明之最佳形態。本發明之光學薄膜，其特徵係使丙烯酸樹脂（A)與纖維素酯樹脂（B)爲95: 5〜30: 70的質量比，使前述丙烯酸樹脂（A)之重量平均分子量Mw爲110000以上1000000以下’該纖維素酯樹脂（B)之醯基總取代度（T)爲2.0以上 3.0以下，碳數爲3以上、7以下之醯基之取代度爲1.2 以上3.0以下’該纖維素酯樹脂（B)之重量平均分子量Mw 爲75 000以上3 000 00以下作爲構成要件，其特性爲張力軟化點爲1〇5〜145°C，耐折度爲50〜100次，其製造方法係藉由熔融流延製膜方法者。 201030080 (丙烯酸樹脂（A)) 本發明所使用的丙烯酸樹脂也包括甲基丙烯酸樹脂。樹脂並無特別限制，但較佳爲由甲基丙烯酸甲酯單位 5 0〜99質量％，及可與此共聚之其他單體單位1〜50質量％所構成者。可共聚之其他單體例如有烷基之碳數爲2〜18的烷基甲基丙烯酸酯、烷基之碳數爲1~18之烷基丙烯酸酯、丙 ^ 烯酸、甲基丙烯酸等之α,β-不飽和酸、馬來酸、富馬酸、衣康酸等之含有不飽和基的二元羧酸、苯乙烯、a-甲基苯乙烯等之芳香族乙烯基化合物、丙烯腈、甲基丙烯腈等之 α,β -不飽和腈、馬來酸酐、馬來醯亞胺、Ν -取代馬來酿亞胺、戊二酸酐等，此等可單獨使用或倂用二種以上之單體。其中從共聚物之耐熱分解性及流動性的觀點，較佳爲甲基丙烯酸酯、乙基丙烯酸酯、η-丙基丙烯酸酯、η_丁基 φ 丙烯酸酯、s-丁基丙烯酸酯、2-乙基己基丙烯酸酯等，特佳爲使用甲基丙烯酸酯或η-丁基丙烯酸酯。本發明之光學薄膜所使用的丙烯酸樹脂（Α)從改善光學薄膜用之脆性及改善與纖維素酯樹脂（Β)相溶時之透明性的觀點，重量平均分子量（Mw)爲120000以上〜1000000 以下。丙烯酸樹脂（A)之重量平均分子量（Mw)最佳爲 130000〜300000的範圍內。本發明之丙烯酸樹脂的重量平均分子量可藉由凝膠滲 -9 - 201030080 透色譜法（以下簡稱GPC)測定。測定條件如下述。溶劑：二氯甲烷柱：Shodex K8 06、K8 05、K8 03 G(昭和電工（股）製連接使用3支）柱溫度：2 5 °C 試料濃度：0.1質量％檢測器：RI Model 504(GL Science 公司製）幫浦：L6000(日立製作所（股）製）流量：1 . Oml/min 校正曲線：使用標準聚苯乙烯STK standard聚苯乙烯（東曹（股）製）Mw = 2,800,000~500之13個樣品的校正曲線。1 3個樣品以大致等間隔使用較佳。本發明之丙烯酸樹脂（A)的製造方法並無特別限制，可使用懸浮聚合、乳化聚合、塊狀聚合或溶液聚合等公知的任何一種方法。其中聚合起始劑可使用一般的過氧化物系及偶氮系的聚合起始劑，也可使用氧化還原系。聚合溫度若爲懸浮或乳化聚合可以30~ 100 °C，塊狀或溶液聚合可以8 0〜160 °C進行聚合。爲了控制所得之共聚物的還原黏度，也可以烷基硫醇等作爲連鏈轉移劑使用，進行聚合。本發明之丙烯酸樹脂也可使用市售物，例如Delpet 60N、80N(旭化成化學（股）製）、Dianal BR52、BR80、 BR8 3、BR8 5、BR8 8 (三菱人造絲（股）製）、KT7 5 (電化學工業（股）製）等。丙烯酸樹脂也可倂用二種以上。 201030080 (纖維素酯樹脂（B)) 本發明之纖維素酯樹脂（B)，特別是從改善脆性或與丙烯酸樹脂（A)相溶時之透明性的觀點，較佳爲醯基之總取代度（T)爲 2.0〜3.0，碳數 3~7之醯基的取代度爲 1.2~3.0，碳數3〜7之醯基的取代度爲2.0〜3.0。換言之，本發明之纖維素酯樹脂係被碳數3〜7之醯基取代的纖維素 ' 酯樹脂，具體而言，較佳爲使用丙醯基、丁醯基等，特佳 φ 爲使用丙醯基。纖維素酯樹脂（B)之醯基的總取代度爲低於2.0時，換言之，纖維素酯分子之2，3，6位之羥基殘度高於1.0 時，丙烯酸樹脂（A)與纖維素酯樹脂（B)無法充分相溶，作爲光學薄膜用時會有混濁的問題。此外，即使醯基之總取代度爲2.0以上，但碳數3 ~7 之醯基的取代度低於1 · 2時，仍無法得到充分相溶性，或脆性降低。例如即使醯基之總取代度爲2.0以上，但碳數 φ 2之醯基，即乙醯基之取代度較高，碳數3-7之醯基的取代度低於1.2時，相溶性會降低，混濁上升。又，即使醯基之總取代度爲2.0以上，但碳數8以上之醯基的取代度較高，碳數3 ~7之醯基的取代度低於1.2 時，脆性變差而無法得到所希望的特性。本發明之纖維素酯樹脂（B)的醯基取代度係總取代度 (T)爲 2.0〜3.0，碳數爲3〜7之醯基的取代度爲1.2-3.0 時，不會有問題，但是碳數3~7以外之醯基，即乙醯基及碳數爲8以上之醯基的取代度總計較佳爲1 .3以下。 -11 - 201030080 又，纖維素酯樹脂（B)之醯基的總取代度（T)更佳爲 2.5〜3_0。本發明中，前述醯基可爲脂肪族醯基或芳香族醯基。其爲脂肪族醯基時，可爲直鏈或支鏈，尙可具有取代基。本發明之醯基的碳數係包含醯基之取代基者。上述纖維素酯樹脂（Β)爲具有作爲取代基之芳香族醯基時，在芳香族環上取代之取代基X的數量較佳爲0〜5 個。此時仍需留意使包含取代基之碳數爲3〜7之醯基的取代度成爲1.2〜3.0。例如爲了使苯醯基之碳數成爲7，而具有含碳之取代基時，使苯醯基之碳數成爲8以上，而不含碳數爲3〜7的醯基。此外，在芳香族環上取代之取代基的數量爲2個以上時，彼此可相同或相異，且可相互連結形成縮合多環化合物（例如萘、茚、茚滿、菲、喹啉、異喹啉、色烯、色滿、酞嗪、吖啶、吲哚、吲哚滿等）。如上述之纖維素酯樹脂（Β)係具有含有碳數3~7之脂肪族醯基之至少1種的構造，可作爲用於本發明之纖維素樹脂的構造使用。本發明之纖維素酯樹脂（Β)的取代度係醯基之總取代度（Τ)爲 2.0~3.0，碳數爲 3-7 之醯基的取代度爲 1.2~3.0。另外，碳數爲3~7之醯基以外，即乙醯基與碳數爲8 以上之醯基之取代度的總和爲1 · 3以下之較佳的構造。本發明之纖維素酯樹脂（Β)特佳爲選自纖維素乙酸酯 201030080 丙酸酯、纖維素乙酸酯丁酸酯、纖維素乙酸酯苯甲酸酯、纖維素丙酸酯、纖維素丁酸酯中之至少一種，即較佳爲具有碳原子數3或4的醯基作爲取代基者。此等中特佳的纖維素酯樹脂爲纖維素乙酸酯丙酸酯或纖維素丙酸酯。 • 未被醯基取代之部分通常以羥基的形態存在。這些可 ' 以公知的方法合成。 φ 又，乙醯基之取代度或其他之醯基的取代度可藉由 ASTM-D817-96所規定的方法得到。本發明之纖維素酯樹脂的重量平均分子量（Mw)，特別是從與丙烯酸樹脂（A)之相溶性、改善脆性的觀點爲 75000以上’較佳爲 75000〜300000的範圍，更佳爲 1 00000~240000 的範圍，特佳爲 1 60000-240000 者。纖維素酯樹脂之重量平均分子量（Mw)低於75000時，耐熱性及脆性之改善效果不足，無法得到本發明的效果。本發明 φ 可混合使用二種以上的纖維素樹脂。本發明之光學薄膜中，含有丙烯酸樹脂（A)與纖維素酯樹脂（B)係95 : 5〜30 : 70的質量比，且爲相溶狀態，較佳爲95 : 5〜50 : 5 0，更佳爲90 : 10〜60 : 40。丙烯酸樹脂（A)與纖維素酯樹脂（B)之質量比爲多於 95 : 5，丙烯酸樹脂（A)較多時，無法充分得到纖維素酯樹脂（B)的效果’又，質量比少於30: 70，丙烯酸樹脂較少時，耐濕性不足。本發明之光學薄膜較佳爲含有相溶狀態之丙烯酸樹脂 -13- 201030080 (A)與纖維素酯樹脂（B)。例如可藉由玻璃轉化溫度T g來判斷丙烯酸樹脂（A)與纖維素酯樹脂（B)是否成爲相溶狀態。例如兩者之樹脂的玻璃轉化溫度不同時，混合兩者的樹脂時，因存在各自樹脂之玻璃轉化溫度，因此混合物之玻璃轉化溫度也有2個以上，但兩者之樹脂相溶時，各自樹脂固有的玻璃轉化溫度消失，成爲1個玻璃轉化溫度，成爲相溶後之樹脂的玻璃轉化溫度。又’此處所謂的玻璃轉化溫度係指使用差示掃描熱量測定器（Perkin Elmer公司製 DSC-7型），以升溫速度 2〇°C/分鐘測定後，依JIS K7121(l 987)求得之中間點玻璃轉化溫度（Tmg)。丙烯酸樹脂（A)與纖維素酯樹脂（B)各自較佳爲非結晶性樹脂，又，其中一方爲結晶性高分子，或一部分具有結晶性的高分子，但本發明之丙烯酸樹脂（A)與纖維素酯樹脂（B)爲相溶，且成爲非結晶性樹脂爲佳。本發明之光學薄膜中之丙烯酸樹脂（A)的重量平均分子量（Mw)及纖維素酯樹脂（B)之重量平均分子量（Mw)及取代度係使用兩者之樹脂對於溶劑之溶解性的差異，進行區分後，各自進行測定而得。區分樹脂時，藉由添加相溶於僅溶解於其中之一之溶劑中的樹脂，再萃取溶解的樹脂來區分，此時可進行加熱操作或回流。可以2個步驟以上組合此等溶劑之組合，再區分樹脂。將溶解後之樹脂與以不溶物殘留的樹脂進行過 -14 - 201030080 濾’對於含有萃取物之溶液藉由使溶劑蒸發、乾燥的操作以區分樹脂。此等區分後的樹脂可藉由高分子之一般結構解析來限定。本發明之光學薄膜含有丙烯酸樹脂（A)及纖維素酯樹月旨（B)以外的樹脂時，也可以相同方法區分。 . 又’相溶後之樹脂的重量平均分子量（Mw)各自不同 • 時’可藉由凝膠滲透色譜法（GPC)，高分子量物先被溶 φ 離，越低分子量物需經過越長時間後始被溶離，故容易區分且可測定分子量。又’藉由GPC測定相溶後樹脂之分子量，同時可分開取得每段時間溶離後之樹脂溶液，餾除溶劑，經乾燥後的樹脂以定量進行結構解析，檢出不同分子量之每一分區的樹脂組成，可分別限定相溶之樹脂。又，將預先以對溶劑之溶解性之差異分開取得的樹脂，各自以GPC測定分子量分布，可各自檢出相溶的樹脂。 φ 又’本發明中，「以相溶狀態含有丙烯酸樹脂（A)與纖維素酯樹脂（B)」係指混合各樹脂（聚合物），結果成爲相溶的狀態，並不包含纖維素酯樹脂（B)中混合單體、二聚物或低聚物等之丙烯酸樹脂的前驅物後，藉由聚合而爲混合樹脂的狀態。例如，在纖維素酯樹脂（B)中混合單體、二聚物或低聚物等之丙烯酸樹脂的前驅物後，藉由聚合得到混合樹脂的步驟係聚合反應複雜，且此方法所製作之樹脂，難以控制反應，分子量調整也困難。又，以此種方法合成樹脂 -15- 201030080 時’大多會產生接枝聚合、交聯反應或環化反應，且常有不溶解於溶劑的情形或無法藉由加熱熔融，因此很難將混合樹脂中之丙烯酸樹脂予以溶離測定重量平均分子量 (Mw)，故難以控制物性，無法作爲可安定製造光學薄膜的樹脂使用。本發明之光學薄膜在不損及光學薄膜用的功能下，可由含有丙烯酸樹脂（A)、纖維素酯樹脂（B)以外之樹脂及添加劑所構成。_ 含有丙烯酸樹脂（A)、纖維素酯樹脂（B)以外的樹脂時’所添加之樹脂可爲相溶狀態，或不相溶而混合著。本發明之光學薄膜中之丙烯酸樹脂（A)與纖維素酯樹脂（B)的總質量較佳爲光學薄膜之55質量％以上，更佳爲 60質量％以上，特佳爲70質量％以上。使用丙烯酸樹脂（A)及纖維素酯樹脂（B)以外之樹脂及添加劑時，在不損及本發明之光學薄膜功能的範圍內調整添加量爲佳。 (丙烯酸粒子（C)) 本發明之光學薄膜較佳爲可含有丙烯酸粒子。本發明之丙烯酸粒子（C)係指於含有相溶狀態之前述丙烯酸樹脂（A)及纖維素酯樹脂（B)之光學薄膜中，以粒子狀態（也稱非相溶狀態）存在的丙烯酸成分。上述丙烯酸粒子（C)係例如將製作之光學薄膜採取所定量後，溶解於溶劑後進行攪拌，使充分溶解分散後，使 -16- 201030080 用具有未達丙烯酸粒子（C)之平均粒徑之孔徑的PTFE製薄膜過濾器過濾，過濾捕集之不溶物的重量較佳爲添加於光學薄膜之丙烯酸粒子（C)的90質量％以上。本發明所使用的丙烯酸粒子（C)並無特別限制，較佳爲具有2層以上之層構造之丙烯酸粒子（C)，特佳爲下述多層構造丙烯酸系粒狀複合物。多層構造丙烯酸系粒狀複合物係指由中心部向外周 φ 部’具有最內硬質層聚合物，顯示橡膠彈性之交聯軟質層聚合物及最外硬質層聚合物重疊爲層狀所成之構造的粒子狀丙烯酸系聚合物。換言之，多層構造丙烯酸系粒狀聚合物係指由中心部朝向外周部’由最內硬質層、交聯軟質層及最外硬質層所構成的多層構造丙烯酸系粒狀聚合物。較佳爲使用此3層芯殼構造之多層構造丙烯酸系粒狀複合物。本發明之丙烯酸系樹脂組成物所使用的多層構造丙烯 φ 酸系粒狀複合物之較佳形態’例如有下述者。例如由（a) 由甲基丙烯酸甲酯8 0〜9 8.9質量％、烷基之碳數爲卜8的烷基丙烯酸酯1~20質量％、及多官能性接枝劑〇.〇1〜03 質量％所構成之單體混合物進行聚合而得的最內硬質層聚合物’（b)在上述最內硬質層聚合物之存在下，由烷基之碳數爲4〜8的垸基丙稀酸醋75〜98.5質量％、多官能性交聯劑0 · 0 1〜5質量％及多官能性接枝劑〇 · 5 ~ 5質量％所構成之單體混合物進行聚合而得的交聯軟質層聚合物、（c)在上述最內硬質層及交聯軟質層所構成的聚合物存在下，由 -17- 201030080 甲基丙烯酸甲酯80~99質量°/。與烷基之碳數爲1〜8之烷基丙烯酸酯1〜20質量％所構成之單體混合物進行聚合而得的最外硬層聚合物所構成的3層構造，且所得的3層構造聚合物爲最內硬質層聚合物（a)5〜40質量％，軟質層聚合物（b)30〜60質量％，及最外硬質層聚合物（c)20〜50質量％所構成，以丙酮區分時，有不溶部分，該不溶部分之甲基乙基酮膨潤度爲1.5~4.0的丙烯酸系粒狀聚合物。又如特公昭60-17406號公報或特公平3-39095號公報所揭示，不僅規定多層構造丙烯酸系粒狀複合物之各層的組成及粒徑，也將多層構造丙烯酸系粒狀複合物之拉伸彈性率及丙酮不溶部分之甲基乙基酮膨潤度設定在特定範圍內，可實現更充分之耐衝擊性及耐應力白化性的平衡。構成多層構造丙烯酸系粒狀複合物之最內硬質層聚合物（a)較佳爲由甲基丙烯酸甲酯80〜98.9質量％、烷基之碳數爲1〜8的烷基丙烯酸酯1〜20質量％及多官能性接枝劑 0.01〜0.3質量％所構成之單體混合物進行聚合所得者。烷基之碳數爲1〜8的烷基丙烯酸酯，例如有甲基丙烯酸酯、乙基丙烯酸酯、η-丙基丙烯酸酯、η-丁基丙烯酸酯、s-丁基丙烯酸酯、2-乙基己基丙烯酸酯等，較佳爲使用甲基丙烯酸酯及η-丁基丙烯酸酯。最內硬質層聚合物（a)中之烷基丙烯酸酯單位的比例爲1〜20質量％，該單位未達1質量％時，聚合物之熱分解性變大，又該單位超過20質量％時，最內硬質層聚合物（c) 之玻璃轉化溫度降低，3層構造丙烯酸系粒狀複合物之耐 -18- 201030080 衝擊性賦予效果降低，故均不佳。多官能性接枝劑例如有具有不同之可聚合之官能基的多官能性單體，例如丙烯酸、甲基丙烯酸、馬來酸、富馬酸之烯丙酯等。較佳爲使用烯丙基甲基丙烯酸酯。使用多官能性接枝劑係用於使最內硬質層聚合物與軟質層聚合物進行化學鍵結，因此，最內硬質層聚合時所用的比例爲 0.0 1 ~0.3 質量％。 φ 構成丙烯酸系粒狀複合物之交聯軟質層聚合物（b)較佳爲在上述最內硬質層聚合物（a)之存在下，由烷基之碳數爲1〜8的烷基丙烯酸酯75〜98.5質量％、多官能性交聯劑0.0 1〜5質量％及多官能性接枝劑0.5〜5質量％所構成之單體混合物進行聚合而得者。其中烷基之碳數爲4〜8的烷基丙烯酸酯，較佳爲使用 η-丁基丙烯酸酯及2-乙基己基丙烯酸酯。又，此等聚合性單體也可與25質量％以下的可共聚 φ 之其他單官能性單體共聚。可共聚之其他單官能性單體，例如有苯乙烯及取代苯乙烯衍生物。烷基之碳數爲4〜8的烷基丙烯酸酯與苯乙烯之比例係當前者越多時，聚合物（b)之玻璃轉化溫度越低，即越能軟質化。又從樹脂組成物之透明性的觀點，軟質層聚合物（b) 之常溫下的折射率較佳爲接近最內硬質層聚合物（a)、最外硬質層聚合物（c)及硬質熱塑性丙烯酸樹脂，考慮這些後選定兩者的比例。 -19- 201030080 多官能性接枝劑可使用如前述最內硬質層聚合物（a) 之項所舉者。在此所用之多官能性接枝劑係爲了使軟質層聚合物（b)與最外硬質層聚合物（〇進行化學性鍵結，該最內硬質層聚合時所使用的比例，從耐衝擊性賦予效果的觀點，較佳爲0.5〜5質量％。多官能性交聯劑可使用二乙烯基化合物、二烯丙基化合物、二丙烯酸化合物、二甲基丙烯酸化合物等一般已知的交聯劑，較佳爲使用聚乙二醇二丙烯酸酯（分子量 200-600) ° 此處使用之多官能性交聯劑係用於軟質層（b)聚合時生成交聯構造，使具有耐衝擊性賦予的效果。但是先前多官能性接枝劑用於軟質層之聚合時，某程度上可生成軟質層（b)之交聯構造，因此多官能性交聯劑非必須成份，但從耐衝擊性賦予效果的觀點，多官能性交聯劑用於軟質層聚合時的比例，較佳爲〇.〇1~5質量％。構成多層構造丙烯酸系粒狀複合物之最外硬質層聚合物（c)較佳爲在上述最內硬質層聚合物（a)及軟質層聚合物 (b)之存在下，由甲基丙烯酸甲酯80〜99質量％及烷基之碳數爲1~8的烷基丙烯酸酯1〜20質量％所構成之單體混合物進行聚合而得者。其中烷基丙烯酸酯可使用前述者’較佳爲使用甲基丙烯酸酯及乙基丙烯酸酯。最外硬質層（c)中之烷基丙烯酸酯單位的比例較佳爲1〜20質量％。又，最外硬質層（c)之聚合時’爲了提升與丙烯酸樹 201030080 脂（A)之相溶性’爲了調節分子量’可將院基硫醇等作爲鏈轉移劑使用。特別是最外硬質層上設置分子量由內側朝外側逐次減少的梯狀，可改良延伸與耐衝擊性之平衡性’故較佳。具體的方法係將形成最外硬質層用之單體混合物分割爲2個以上，依序增加每次添加之鏈轉移劑量的方法’可使形成最外硬質層之聚合物的分子量’由多層構造丙烯酸系粒狀 ❹ 複合物之內側朝外側減少。此時所形成的分子量可藉由測定將每次使用之單體混合物各自單獨在相同條件聚合所得之聚合物的分子量而得知。本發明較適合使用的丙烯酸粒子（C)之粒徑並無特別限定，較佳爲1 Onm以上、1 OOOnm以下，更佳爲20nm以上、500nm以下，特佳爲50nm以上、400nm以下。本發明較適合使用之多層構造聚合物的丙烯酸系粒狀 φ 複合物中，芯與殼之質量比並無特別限定，但是多層構造聚合物全體爲100質量份時，芯層較佳爲50質量份以上，90質量份以下，更佳爲60質量份以上，80質量份以下。此芯層係指最內硬質層。這種多層構造丙烯酸系粒狀複合物之市售品，例如有三菱人造絲公司製“metablen”、鐘淵化學工業公司製 “kanes”、吳羽化學工業公司製“ParaIoid，，、R〇hm and Haas 公司製“Acryi〇id” 、 ganz 化成工業公司製 “staphiloid”及 kuraray 公司製 “parapet SA，，等，此等可單 -21 - 201030080 獨使用或使用2種以上。又，作爲本發明較適合使用之丙烯酸粒子（c)’較適用之接枝共聚合物之丙烯酸粒子（C1)的具體例有在橡膠質聚合物之存在下，將不飽和羧酸酯系單體、不飽和羧酸系單體、芳香族乙烯基系單體，及必要時可與此等共聚之其他乙烯基系單體所構成之單體混合物進行共聚而得的接枝共聚物。接枝共聚物之丙烯酸粒子（C1)所使用的橡膠質聚合物並無特別限制，可使用二烯系橡膠、丙烯酸系橡膠及乙烯系橡膠等。具體例有聚丁二烯、苯乙烯-丁二烯共聚物、苯乙烯-丁二烯之嵌段共聚物、丙烯腈-丁二烯共聚物、丙烯酸丁酯-丁二烯共聚物、聚異戊二烯、丁二烯-甲基丙烯酸甲酯共聚物、丙烯酸丁酯-甲基丙烯酸甲酯共聚物'丁二烯-丙烯酸乙酯共聚物、乙烯-丙烯共聚物、乙烯-丙烯-二烯系共聚物、乙烯-異戊二烯共聚物、及乙烯-丙烯酸甲酯共聚物等。此等橡膠質聚合物可使用1種或2種以上的混合物。又，本發明之光學薄膜中添加丙烯酸粒子（C)時，從可得到透明性較高之薄膜的觀點，丙烯酸樹脂（A)與纖維素酯樹脂（B)之混合物的折射率與丙烯酸粒子（C)之折射率接近較佳。具體而言，丙烯酸粒子（C)與丙烯酸樹脂（A)之折射率差較佳爲〇.〇5以下，更佳爲0.02以下，特佳爲〇 . 0 1以下。爲了滿足這種折射率條件時，可藉由調整丙烯酸樹脂 -22- 201030080 (A)之各單體單位組成比的方法，及/或調整丙烯酸粒子（C) 所使用的橡膠質聚合物或單體之組成比的方法等，可縮小折射率差，而得到透明性優異的光學薄膜。此處所謂的折射率差係指在丙烯酸樹脂（A)可溶的溶劑中，以適當條件將本發明之光學薄膜充分溶解形成白濁溶液後，藉由離心分離等操作，分離成溶劑可溶部分及不溶部分，此可溶部分（丙烯酸樹脂（A))及不溶部分（丙烯酸 φ 粒子（C))分別純化後，顯示測得的折射率（23°C、測定波長：550nm)之差。本發明中，丙烯酸樹脂（A)中調配丙烯酸粒子（C)的方法並無特別限定，較佳爲使用預先摻混丙烯酸樹脂（A)及其他任意成份後，一般於200〜3 5 0°C下添加丙烯酸粒子 (C)，同時藉由單軸或雙軸擠壓機進行均勻熔融混練的方法。此外，可使用將預先分散有丙烯酸粒子（C)的溶液添 φ 加於溶解有丙烯酸樹脂（A)及纖維素酯樹脂（B)的溶液（摻雜液）進行混合的方法或將丙烯酸粒子（C)及其他任意之添加劑溶解、混合後的溶液進行連線（inline)添加等的方法。本發明之丙烯酸粒子也可使用市售品。例如有metablen W-341(C2)(三菱人造絲（股）製）、 chemisnow MR-2G(C3)、MS-3 00X(C4)(綜硏化學（股）製）等。本發明之光學薄膜中，相對於構成該薄膜之樹脂總質 -23- 201030080 量，較佳爲含有0.5〜30質量％之丙烯酸粒子（c)，更佳爲含有1 ·〇〜15質量％的範圍。 <其他的添加劑> 本發明之光學薄膜中較佳爲含有賦予薄膜加工性的可塑劑、防止薄膜劣化之抗氧化劑、賦予紫外線吸收功能之紫外線吸收劑、賦予薄膜滑性的微粒子（消光劑）等的添加劑。 <可塑劑> 可塑劑例如有酞酸酯系、脂肪酸酯系、偏苯三甲酸酯系、磷酸酯系、聚酯系或環氧系等。其中較佳爲使用聚酯系及酞酸酯系的可塑劑。聚酯系可塑劑雖具有比酞酸二辛酯等酞酸酯系之可塑劑更優異的非移行性及耐萃取性，但可塑化效果及相溶性稍差。因此’可因應用途選擇此等可塑劑，或藉由倂用可適用於廣範圍的用途。聚酯系可塑劑係一價〜四價之羧酸與一價〜六價之醇的反應物，但主要可使用二價羧酸與乙二醇反應所得者。代表性的二價羧酸例如有戊二酸、衣康酸、己二酸、酞酸、壬二酸、癸二酸等。特別是使用己二酸、酞酸等時，可得可塑化特性優異者。乙二醇例如有乙烯、丙烯、1,3-丁烯、1,4-丁烯、 1,6-六甲烯、新戊烯 '二乙烯、三乙烯、二丙烯等之乙二 -24- 201030080 醇。此等二價羧酸及乙二醇可各自單獨使用或混合使用。此酯系之可塑劑可爲酯、低聚酯、聚酯型中任何一種，分子量可爲1〇〇〜1 0000的範圍，較佳爲600~3000的範圍時可塑化效果較大。又，可塑劑之黏度雖與分子結構及分子量有關，但若爲己二酸系可塑劑時，從相溶性、可塑化效率的關係，以 200〜5000MPa«s(25°C)的範圍較佳。另外，可倂用一些聚 φ 醋系可塑劑。可塑劑相對於本發明之光學薄膜100質量份，較佳爲添加0.5~30質量份。可塑劑之添加量超過30質量份時，表面具黏性，因此實用上不佳。 (抗氧化劑）本發明中，抗氧化劑可使用公知者。特佳爲使用內酯系、硫系、酚系、雙鍵系、受阻胺 φ 系、磷系化合物。 , 例如較佳爲含有 Ciba Japan股份公司之商品名 “ I r g a f 〇 s X P 4 0 ”、“ I r g a f o s X P 6 0 ” 的市售品。上述酚系化合物較佳爲具有2,6 -二烷基酚之結構者，例如有 Ciba Japan 股份公司以“Irganox 1 076”、 “IrganoxlOlO”、（股）ADEKA“ADEKASTAB AO-50”之商品名所市售者。201030080 6. Technical Field The present invention relates to an optical film, a method for producing an optical film, a polarizing plate, and a liquid crystal display device, and more particularly to an optical film which is less prone to light leakage and has good reworkability. Polarizer and liquid crystal display device. [Prior Art] Φ The liquid crystal display device is in demand for use in liquid crystal televisions and liquid crystal displays of personal computers. Generally, a liquid crystal display device is formed by arranging a liquid crystal cell such as a transparent electrode, a liquid crystal layer, a color filter or the like on a glass plate with two polarizing plates provided on both sides thereof, and each polarizing plate is made of two optical films ( The polarizer protective film is composed of a polarizer (also called a polarizer or a polarizing film). This polarizing plate protective film is usually a cellulose triacetate film. In addition, due to technological advances in recent years, the liquid crystal display device has been accelerated to a large size, and the use of the liquid crystal display device has also been diversified. For example, it can be used as an advertisement display that is used in a large display installed on a street or a store, or used in a public place where a display device called a digital signage is used. This use is assumed to be used outdoors, and therefore, the polarizing plate protective film requires higher moisture resistance due to the problem of deterioration due to moisture absorption of the polarizing film. However, cellulose ester films such as cellulose triacetate films which have been conventionally used have difficulty in obtaining sufficient moisture resistance. In order to improve the moisture resistance technology, for example, it is proposed that an acrylic resin combination impact resistant acrylic rubber-methyl methacrylate copolymer or butyl modified ethyl-5-201030080 fluorenyl cellulose is 60 to 90/40-1 0 A method of the ratio (for example, Patent Document 1). However, this method is advantageous in that the acrylic resin film has an easy cracking and brittleness property (brittleness), and the film is broken during production or rework, and it is not easy to manufacture an optical film for a large liquid crystal display device. Further, an acrylic resin film represented by polymethyl methacrylate (hereinafter abbreviated as PMMA) generally lacks heat resistance, and has a problem of shape change such as use at a high temperature and long-term use. This problem is not only a physical property of a film monomer, but also an important problem for a polarizing plate or a display device using such a film. In other words, in the liquid crystal display device, as the film is deformed, the polarizing plate is curled, thereby causing a problem that the entire panel is deformed. The problem caused by the deformation of the film occurs not only on the backlight side but also when the side surface position is recognized. A technique of mixing a plasticizer with a cellulose ester film or mixing an acrylic resin for controlling optical characteristics has also been proposed (Patent Document 2). However, since the molecular weight of the acrylic resin disclosed herein is small, sufficient moisture resistance cannot be obtained, and in a high-humidity environment, light leakage cannot be improved due to problems such as deterioration of the polarizing plate or change in optical enthalpy of the optical film. Patent Document 3 proposes a film produced by a melt casting method in which an acrylic resin and a cellulose ester resin are mixed. This method also does not sufficiently improve the brittleness. Patent Document 3 also describes an example in which a plasticizer is added, but the heat resistance which is indispensable in the prior art is deteriorated, and it is not possible to have both brittleness and heat resistance. [Patent Document] -6-201030080 [Patent Document 1] Japanese Laid-Open Patent Publication No. JP-A No. Hei. [The subject of the invention] ' [Problems to be solved by the invention] φ In view of the above problems, the present invention has an object of providing an optical film capable of simultaneously improving moisture absorption, heat resistance and brittleness, and furthermore, to provide light leakage. An optical film having good workability, a method for producing the same, a polarizing plate, and a liquid crystal display device are intended. [Means for Solving the Problem] The above object of the present invention can be achieved by the following configuration. An optical film characterized in that the acrylic resin (A) and the fiber φ-ester resin (B) have a mass ratio of 95:5 to 30:70, and the weight average molecular weight Mw of the acrylic resin (A) is 110,000 or more. 1,000,000 or less, the total ester group (T) of the cellulose ester resin (B) is 2.0 or more and 3.0 or less, and the degree of substitution of the fluorenyl group having 3 or more and 7 or less carbon atoms is 1.2 or more and 3. The ester-ester resin (B) has a weight average molecular weight Mw of 75,000 or more and 300,000 or less, a tensile softening point of 105 to 145 ° C, a folding endurance of 50 to 1 〇〇, and is produced by a melt casting film forming method. . 2. A method of producing an optical film, characterized in that the optical film of the first item is manufactured by stretching in 201030080 in at least one of a transport direction and a width direction, and the extension temperature is an optical film before extension. Tg~Tg + 50〇c^ ° 3. A polarizing plate characterized by having the optical film of the above item 1. 4. A liquid crystal display device characterized by having the polarizing plate of the third item. According to the present invention, an optical film which simultaneously improves moisture absorption, heat resistance and brittleness can be provided, whereby light leakage is less likely to occur, and An optical film having good workability, a method for producing the same, a polarizing plate, and a liquid crystal display device. [Mode for Carrying Out the Invention] The best mode for carrying out the invention will be described in detail below. The optical film of the present invention is characterized in that the acrylic resin (A) and the cellulose ester resin (B) have a mass ratio of 95:5 to 30:70, and the weight average molecular weight Mw of the acrylic resin (A) is 110,000 or more. 1,000,000 or less, the total thiol group (T) of the cellulose ester resin (B) is 2.0 or more and 3.0 or less, and the degree of substitution of the fluorenyl group having 3 or more and 7 or less carbon atoms is 1.2 or more and 3.0 or less. The weight average molecular weight Mw of the resin (B) is 75 000 or more and 300 000 or less as a constituent element, and the characteristic is that the tension softening point is 1〇5 to 145 ° C, and the folding resistance is 50 to 100 times, and the manufacturing method thereof is A method of film formation by melt casting. 201030080 (Acrylic Resin (A)) The acrylic resin used in the present invention also includes a methacrylic resin. The resin is not particularly limited, but is preferably composed of 100 to 99% by mass of methyl methacrylate unit and 1 to 50% by mass of other monomer units copolymerizable therewith. Other monomers copolymerizable include, for example, an alkyl methacrylate having an alkyl group having 2 to 18 carbon atoms, an alkyl group having an alkyl group having 1 to 18 carbon atoms, a acrylic acid, methacrylic acid or the like. An aromatic vinyl compound such as an unsaturated group-containing dicarboxylic acid such as α,β-unsaturated acid, maleic acid, fumaric acid or itaconic acid, styrene or a-methylstyrene, or acrylonitrile , α,β-unsaturated nitrile such as methacrylonitrile, maleic anhydride, maleimide, hydrazine-substituted maleimide, glutaric anhydride, etc., which may be used alone or in combination of two or more. Monomer. Among them, from the viewpoints of thermal decomposition resistance and fluidity of the copolymer, methacrylate, ethyl acrylate, η-propyl acrylate, η-butyl φ acrylate, s-butyl acrylate, and 2 are preferable. Ethylhexyl acrylate or the like, particularly preferably methacrylate or η-butyl acrylate. The acrylic resin used in the optical film of the present invention has a weight average molecular weight (Mw) of from 120,000 to 1,000,000 from the viewpoint of improving the brittleness of the optical film and improving the transparency when it is compatible with the cellulose ester resin. the following. The weight average molecular weight (Mw) of the acrylic resin (A) is preferably in the range of from 130,000 to 300,000. The weight average molecular weight of the acrylic resin of the present invention can be measured by gel permeation -9 - 201030080 by chromatography (hereinafter referred to as GPC). The measurement conditions are as follows. Solvent: Dichloromethane column: Shodex K8 06, K8 05, K8 03 G (3 joints used by Showa Denko Co., Ltd.) Column temperature: 2 5 °C Sample concentration: 0.1% by mass Detector: RI Model 504 (GL Science company) Pump: L6000 (Hitachi Manufacturing Co., Ltd.) Flow: 1. Oml/min Calibration curve: Standard polystyrene STK standard polystyrene (made by Tosoh Corporation) Mw = 2,800,000~500 Calibration curve for 13 samples. It is preferred to use 13 samples at approximately equal intervals. The method for producing the acrylic resin (A) of the present invention is not particularly limited, and any known method such as suspension polymerization, emulsion polymerization, bulk polymerization or solution polymerization can be used. As the polymerization initiator, a general peroxide-based or azo-based polymerization initiator may be used, and a redox system may also be used. The polymerization temperature may be 30 to 100 ° C for suspension or emulsion polymerization, and polymerization may be carried out at 80 to 160 ° C in bulk or solution polymerization. In order to control the reduction viscosity of the obtained copolymer, an alkylthiol or the like may be used as a chain transfer agent to carry out polymerization. Commercially available materials such as Delpet 60N, 80N (made by Asahi Kasei Chemicals Co., Ltd.), Dianal BR52, BR80, BR8 3, BR8 5, BR8 8 (manufactured by Mitsubishi Rayon Co., Ltd.), KT7 can also be used as the acrylic resin of the present invention. 5 (electrochemical industry (stock) system) and so on. Acrylic resins may be used in combination of two or more kinds. 201030080 (Cellulose ester resin (B)) The cellulose ester resin (B) of the present invention is preferably a total substitution of a mercapto group from the viewpoint of improving the brittleness or the transparency when it is compatible with the acrylic resin (A). The degree of substitution (T) is 2.0 to 3.0, the degree of substitution of the fluorenyl group having 3 to 7 carbon atoms is 1.2 to 3.0, and the degree of substitution of the fluorenyl group having 3 to 7 carbon atoms is 2.0 to 3.0. In other words, the cellulose ester resin of the present invention is a cellulose 'ester resin substituted with a fluorenyl group having 3 to 7 carbon atoms. Specifically, a propyl group, a butyl group or the like is preferably used, and particularly preferably φ is a propyl group. . The total degree of substitution of the thiol group of the cellulose ester resin (B) is less than 2.0, in other words, when the hydroxyl residue at the 2, 3, and 6 positions of the cellulose ester molecule is higher than 1.0, the acrylic resin (A) and cellulose The ester resin (B) is not sufficiently compatible, and there is a problem of turbidity when used as an optical film. Further, even if the total substitution degree of the fluorenyl group is 2.0 or more, when the degree of substitution of the fluorenyl group having 3 to 7 carbon atoms is less than 1.25, sufficient compatibility or brittleness is not obtained. For example, even if the total substitution degree of the fluorenyl group is 2.0 or more, the sulfhydryl group having a carbon number of φ 2 , that is, the degree of substitution of the acetyl group is higher, and the degree of substitution of the fluorenyl group having 3 to 7 carbon atoms is less than 1.2, the compatibility is Lower, turbidity rises. Further, even if the total substitution degree of the fluorenyl group is 2.0 or more, the degree of substitution of the fluorenyl group having 8 or more carbon atoms is high, and when the degree of substitution of the fluorenyl group having 3 to 7 carbon atoms is less than 1.2, the brittleness is deteriorated and the The desired characteristics. The cellulose ester resin (B) of the present invention has a thiol substitution degree of a total degree of substitution (T) of 2.0 to 3.0, and a substitution degree of a fluorenyl group having a carbon number of 3 to 7 of 1.2 to 3.0 is not problematic. However, the degree of substitution of the fluorenyl group having 3 to 7 carbon atoms, that is, an oxime group and a fluorenyl group having 8 or more carbon atoms is preferably at most 1.3. -11 - 201030080 Further, the total substitution degree (T) of the thiol group of the cellulose ester resin (B) is more preferably 2.5 to 3_0. In the present invention, the above mercapto group may be an aliphatic mercapto group or an aromatic mercapto group. When it is an aliphatic fluorenyl group, it may be a straight chain or a branched chain, and hydrazine may have a substituent. The carbon number of the fluorenyl group of the present invention is a substituent containing a fluorenyl group. When the cellulose ester resin (fluorene) is an aromatic fluorenyl group having a substituent, the number of substituents X substituted on the aromatic ring is preferably from 0 to 5. At this time, it is to be noted that the degree of substitution of the fluorenyl group having a carbon number of 3 to 7 containing a substituent is 1.2 to 3.0. For example, when the carbon number of the benzoquinone group is 7 and the carbon-containing substituent is used, the carbon number of the phenylhydrazine group is 8 or more, and the fluorenyl group having 3 to 7 carbon atoms is not contained. Further, when the number of the substituents substituted on the aromatic ring is two or more, they may be the same or different from each other, and may be bonded to each other to form a condensed polycyclic compound (for example, naphthalene, anthracene, indane, phenanthrene, quinoline, or different). Quinoline, chromene, chroman, pyridazine, acridine, anthracene, anthracene, etc.). The above-mentioned cellulose ester resin (Β) has a structure containing at least one of aliphatic aliphatic groups having 3 to 7 carbon atoms, and can be used as a structure for the cellulose resin of the present invention. The degree of substitution of the cellulose ester resin (yttrium) of the present invention is a total degree of substitution (Τ) of the thiol group of 2.0 to 3.0, and the degree of substitution of the fluorenyl group having a carbon number of 3 to 7 is 1.2 to 3.0. Further, in addition to the fluorenyl group having 3 to 7 carbon atoms, the sum of the substitution degrees of the fluorenyl group and the fluorenyl group having 8 or more carbon atoms is preferably 1/3 or less. The cellulose ester resin (Β) of the present invention is particularly preferably selected from the group consisting of cellulose acetate 201030080 propionate, cellulose acetate butyrate, cellulose acetate benzoate, cellulose propionate, At least one of the cellulose butyrates, that is, a fluorenyl group having 3 or 4 carbon atoms is preferred as the substituent. Particularly preferred cellulose ester resins are cellulose acetate propionate or cellulose propionate. • The part that is not replaced by a thiol group usually exists in the form of a hydroxyl group. These can be synthesized in a known manner. φ Further, the degree of substitution of the acetamidine group or the degree of substitution of other thiol groups can be obtained by the method specified in ASTM-D817-96. The weight average molecular weight (Mw) of the cellulose ester resin of the present invention is, in particular, from the viewpoint of compatibility with the acrylic resin (A) and improvement of brittleness, in the range of 75,000 or more, preferably 75,000 to 300,000, more preferably 100,000. Range of ~240000, especially for 1 60000-240000. When the weight average molecular weight (Mw) of the cellulose ester resin is less than 75,000, the effect of improving heat resistance and brittleness is insufficient, and the effects of the present invention cannot be obtained. In the present invention, two or more kinds of cellulose resins may be used in combination. The optical film of the present invention contains a mass ratio of the acrylic resin (A) to the cellulose ester resin (B) of 95: 5 to 30: 70, and is in a compatible state, preferably 95: 5 to 50: 5 0 More preferably 90: 10~60: 40. When the mass ratio of the acrylic resin (A) to the cellulose ester resin (B) is more than 95:5, when the acrylic resin (A) is large, the effect of the cellulose ester resin (B) cannot be sufficiently obtained', and the mass ratio is small. At 30:70, when the acrylic resin is small, the moisture resistance is insufficient. The optical film of the present invention is preferably an acrylic resin-13-201030080 (A) and a cellulose ester resin (B) in a compatible state. For example, whether or not the acrylic resin (A) and the cellulose ester resin (B) are in a compatible state can be judged by the glass transition temperature T g . For example, when the glass transition temperatures of the resins of the two are different, when the resins of the two are mixed, the glass transition temperature of the respective resins is present, so that the glass transition temperature of the mixture is also two or more, but when the resins of the two are compatible, the respective resins are used. The intrinsic glass transition temperature disappears and becomes one glass transition temperature, which becomes the glass transition temperature of the resin after the compatibility. In addition, the term "glass transition temperature" as used herein refers to a differential scanning calorimeter (DSC-7 model manufactured by Perkin Elmer Co., Ltd.), and is measured at a temperature increase rate of 2 〇 ° C/min, and then obtained according to JIS K7121 (l 987). The intermediate point glass transition temperature (Tmg). Each of the acrylic resin (A) and the cellulose ester resin (B) is preferably a non-crystalline resin, and one of them is a crystalline polymer or a part of a polymer having crystallinity, but the acrylic resin of the present invention (A) It is compatible with the cellulose ester resin (B) and is preferably an amorphous resin. The weight average molecular weight (Mw) of the acrylic resin (A) and the weight average molecular weight (Mw) and the degree of substitution of the cellulose ester resin (B) in the optical film of the present invention are the difference in solubility of the resin using the solvent. After the distinction is made, each is measured. When the resin is distinguished, it is distinguished by adding a resin in which the phase is dissolved in the solvent dissolved only in one of them, and then extracting the dissolved resin, and heating or refluxing can be performed at this time. The combination of these solvents can be combined in two or more steps to distinguish the resin. The dissolved resin and the resin remaining as insoluble matter are subjected to -14 - 201030080 filtration. The solution containing the extract is distinguished from the resin by evaporating and drying the solvent. These differentiated resins can be defined by the general structural analysis of the polymer. When the optical film of the present invention contains a resin other than the acrylic resin (A) and the cellulose ester tree (B), it can be distinguished by the same method. Moreover, the weight average molecular weight (Mw) of the resin after the difference is different. • By gel permeation chromatography (GPC), the high molecular weight substance is first dissolved, and the lower the molecular weight, the longer it takes. After being dissolved, it is easy to distinguish and the molecular weight can be measured. In addition, the molecular weight of the resin after dissolving is determined by GPC, and the resin solution after each period of time is separately obtained, the solvent is distilled off, and the dried resin is quantitatively analyzed for structure, and each partition of different molecular weight is detected. The resin composition can respectively define a compatible resin. Further, each of the resins separately obtained by the difference in the solubility of the solvent was measured for molecular weight distribution by GPC, and each of the resins was detected. In the present invention, the "containing the acrylic resin (A) and the cellulose ester resin (B) in a compatible state" means mixing the respective resins (polymers), and as a result, they are in a compatible state, and do not contain the cellulose ester. In the resin (B), a precursor of an acrylic resin such as a monomer, a dimer or an oligomer is mixed, and then the state of the resin is mixed by polymerization. For example, after mixing a precursor of an acrylic resin such as a monomer, a dimer or an oligomer in the cellulose ester resin (B), the step of obtaining a mixed resin by polymerization is complicated in polymerization, and the method is produced. Resin, it is difficult to control the reaction, and molecular weight adjustment is also difficult. Moreover, when the resin is synthesized in this way, -15-201030080, most of them will undergo graft polymerization, crosslinking reaction or cyclization reaction, and often do not dissolve in a solvent or melt by heating, so it is difficult to mix. Since the acrylic resin in the resin is dissolved and the weight average molecular weight (Mw) is measured, it is difficult to control the physical properties, and it cannot be used as a resin capable of stably producing an optical film. The optical film of the present invention can be composed of a resin other than the acrylic resin (A) and the cellulose ester resin (B) and an additive, without impairing the function of the optical film. _ When the resin other than the acrylic resin (A) or the cellulose ester resin (B) is contained, the resin to be added may be in a compatible state or may be incompatible with each other. The total mass of the acrylic resin (A) and the cellulose ester resin (B) in the optical film of the present invention is preferably 55 mass% or more, more preferably 60 mass% or more, and particularly preferably 70 mass% or more of the optical film. When a resin other than the acrylic resin (A) and the cellulose ester resin (B) and an additive are used, it is preferred to adjust the amount of addition within a range that does not impair the function of the optical film of the present invention. (Acrylic Particle (C)) The optical film of the present invention preferably contains acrylic particles. The acrylic particles (C) of the present invention are acrylic components which are present in a particle state (also referred to as an incompatible state) in an optical film containing the acrylic resin (A) and the cellulose ester resin (B) in a compatible state. . The acrylic particles (C) are obtained by, for example, taking the optical film produced in a predetermined amount, dissolving in a solvent, stirring, and sufficiently dissolving and dispersing, and then using -16-201030080 to have an average particle diameter of the non-acrylic particles (C). The PTFE membrane filter having a pore size is filtered, and the weight of the insoluble matter collected by filtration is preferably 90% by mass or more based on the acrylic particles (C) added to the optical film. The acrylic particles (C) used in the present invention are not particularly limited, and are preferably acrylic particles (C) having a layer structure of two or more layers, and particularly preferably an acrylic-based particulate composite having the following multilayer structure. The multi-layered structure of the acrylic granular composite means that the innermost portion of the central portion φ portion has the innermost hard layer polymer, and the rubber-elastic crosslinked soft layer polymer and the outermost hard layer polymer are laminated to form a layer. A particulate acrylic polymer of the structure. In other words, the multilayer structure acrylic particulate polymer refers to a multilayer structure acrylic particulate polymer composed of an innermost hard layer, a crosslinked soft layer, and an outermost hard layer from the center portion toward the outer peripheral portion. It is preferable to use the multilayer structure of the three-layer core-shell structure to form an acrylic granular composite. The preferred embodiment of the multilayer structure propylene φ acid-based particulate composite used in the acrylic resin composition of the present invention is as follows. For example, (a) from 0 to 98.9% by mass of methyl methacrylate, from 1 to 20% by mass of the alkyl acrylate having a carbon number of the alkyl group, and a polyfunctional grafting agent 〇.〇1~ 03% by mass of the monomer mixture formed by polymerization of the innermost hard layer polymer' (b) in the presence of the innermost hard layer polymer, the alkyl group having a carbon number of 4 to 8 in the alkyl group Crosslinked softness obtained by polymerizing a monomer mixture composed of a dilute vinegar of 75 to 98.5% by mass, a polyfunctional crosslinking agent of 0·0 1 to 5 mass%, and a polyfunctional grafting agent 〇·5 to 5 mass% The layer polymer, (c) in the presence of the polymer consisting of the innermost hard layer and the crosslinked soft layer, is from -17 to 201030080 methyl methacrylate 80 to 99 mass%. A three-layer structure composed of an outermost hard layer polymer obtained by polymerizing a monomer mixture composed of an alkyl acrylate having an alkyl group having 1 to 8 carbon atoms and having a carbon number of 1 to 20%, and the obtained three-layer structure The polymer is composed of the innermost hard layer polymer (a) 5 to 40% by mass, the soft layer polymer (b) 30 to 60% by mass, and the outermost hard layer polymer (c) 20 to 50% by mass. In the case of acetone separation, there is an insoluble portion, and the insoluble portion has an ethyl ketone having a degree of swelling of methyl ethyl ketone of 1.5 to 4.0. Further, as disclosed in Japanese Patent Publication No. Sho 60-17406 or Japanese Patent Publication No. Hei-3-39095, the composition and particle diameter of each layer of the multilayered acrylic particulate composite are specified, and the multilayered structural acrylic composite is also pulled. The elongation modulus and the methyl ethyl ketone swelling degree of the acetone-insoluble portion are set within a specific range, and a balance of more sufficient impact resistance and stress whitening resistance can be achieved. The innermost hard layer polymer (a) constituting the multilayer structure acrylic granular composite is preferably an alkyl acrylate 1 to 80% by mass of methyl methacrylate and 1 to 8 carbon atoms of the alkyl group. A monomer mixture composed of 20% by mass and a polyfunctional grafting agent of 0.01 to 0.3% by mass is obtained by polymerization. The alkyl acrylate having an alkyl group having 1 to 8 carbon atoms, for example, methacrylate, ethacrylate, η-propyl acrylate, η-butyl acrylate, s-butyl acrylate, 2- As the ethylhexyl acrylate or the like, methacrylate and η-butyl acrylate are preferably used. The ratio of the alkyl acrylate unit in the innermost hard layer polymer (a) is 1 to 20% by mass, and when the unit is less than 1% by mass, the thermal decomposition property of the polymer becomes large, and the unit exceeds 20% by mass. When the glass transition temperature of the innermost hard layer polymer (c) is lowered, the impact resistance imparting effect of the -18-201030080 of the three-layer structure acrylic granular composite is lowered, so that it is not preferable. The polyfunctional grafting agent is, for example, a polyfunctional monomer having a different polymerizable functional group such as acrylic acid, methacrylic acid, maleic acid, allyl fumarate or the like. It is preferred to use allyl methacrylate. The polyfunctional grafting agent is used to chemically bond the innermost hard layer polymer to the soft layer polymer. Therefore, the ratio of the innermost hard layer polymerization is 0.0 1 to 0.3 mass%. Φ The crosslinked soft layer polymer (b) constituting the acrylic granular composite is preferably an alkylacrylic acid having an alkyl group having 1 to 8 carbon atoms in the presence of the innermost hard layer polymer (a). The monomer mixture of 75 to 98.5% by mass of the ester, 0.01 to 5% by mass of the polyfunctional crosslinking agent, and 0.5 to 5% by mass of the polyfunctional grafting agent is obtained by polymerization. The alkyl acrylate wherein the alkyl group has a carbon number of 4 to 8, preferably η-butyl acrylate and 2-ethylhexyl acrylate. Further, these polymerizable monomers may be copolymerized with 25% by mass or less of another monofunctional monomer copolymerizable φ. Other monofunctional monomers which are copolymerizable are, for example, styrene and substituted styrene derivatives. When the ratio of the alkyl acrylate having an alkyl group of 4 to 8 to styrene is as high as possible, the lower the glass transition temperature of the polymer (b), the softer it is. Further, from the viewpoint of the transparency of the resin composition, the refractive index at room temperature of the soft layer polymer (b) is preferably close to the innermost hard layer polymer (a), the outermost hard layer polymer (c), and the hard thermoplastic. Acrylic resin, consider the ratio of these two after considering these. -19- 201030080 A polyfunctional grafting agent can be used as described above for the innermost hard layer polymer (a). The polyfunctional grafting agent used herein is used to make the soft layer polymer (b) and the outermost hard layer polymer (chemically bonded, the ratio of the innermost hard layer to be polymerized from impact resistance). The viewpoint of the effect of imparting the effect is preferably 0.5 to 5% by mass. The polyfunctional crosslinking agent may be a generally known crosslinking agent such as a divinyl compound, a diallyl compound, a diacrylic compound or a dimethacrylic compound. Preferably, polyethylene glycol diacrylate (molecular weight: 200-600) is used. The polyfunctional crosslinking agent used herein is used for forming a crosslinked structure during the polymerization of the soft layer (b) to impart impact resistance. However, when the polyfunctional grafting agent is used for the polymerization of the soft layer, the crosslinked structure of the soft layer (b) can be formed to some extent, so that the polyfunctional crosslinking agent is not essential, but the impact resistance is imparted. The ratio of the polyfunctional crosslinking agent to the soft layer polymerization is preferably from ~1 to 5% by mass. The outermost hard layer polymer (c) constituting the multilayer structure acrylic granular composite is preferably. For the most In the presence of the hard layer polymer (a) and the soft layer polymer (b), the alkyl acrylate having a methyl methacrylate content of 80 to 99% by mass and the alkyl group having a carbon number of 1 to 8 is 1 to 20% by mass. The monomer mixture is polymerized, wherein the alkyl acrylate can be used as described above, preferably using methacrylate and ethyl acrylate. The alkyl acrylate unit in the outermost hard layer (c) The ratio is preferably from 1 to 20% by mass. Further, in the polymerization of the outermost hard layer (c), in order to improve the compatibility with the acrylic tree 201030080 grease (A), in order to adjust the molecular weight, a hospital-based mercaptan or the like may be used. The chain transfer agent is used. In particular, the outermost hard layer is provided with a ladder shape in which the molecular weight is gradually decreased from the inner side to the outer side, and the balance between the elongation and the impact resistance can be improved. Therefore, the specific method is to form the outermost hard layer. The monomer mixture is divided into two or more, and the method of sequentially increasing the chain transfer dose per addition 'the molecular weight of the polymer forming the outermost hard layer' is from the inner side of the multilayered acrylic granular ruthenium complex to the outer side. cut back. The molecular weight formed at that time can be known by measuring the molecular weight of the polymer obtained by separately polymerizing each of the monomer mixtures used under the same conditions. The particle size of the acrylic particles (C) which are more suitably used in the present invention is not particularly The thickness is preferably 1 Onm or more and 1 0.000 nm or less, more preferably 20 nm or more and 500 nm or less, and particularly preferably 50 nm or more and 400 nm or less. The acrylic granule φ composite of the multilayer structure polymer which is more suitable for use in the present invention. The mass ratio of the core to the shell is not particularly limited. When the total amount of the multilayer structure polymer is 100 parts by mass, the core layer is preferably 50 parts by mass or more, 90 parts by mass or less, more preferably 60 parts by mass or more, and 80 parts by mass. The core layer is referred to as the innermost hard layer. Commercial products of the multilayered structure of the acrylic granular composite are, for example, "metablen" manufactured by Mitsubishi Rayon Co., Ltd., "kanes" manufactured by Kaneka Chemical Industry Co., Ltd., and Wu Yu. Chemical Industry Corporation "ParaIoid,", "Acryi〇id" by Röhm and Haas, "staphiloid" by ganz Chemical Industry Co., Ltd. and "parapet SA" by kuraray company, , These can be a single -21--201030080 used singly or two or more kinds. Further, a specific example of the acrylic particles (C1) which is a suitable grafting copolymer for the acrylic particles (c) which are preferably used in the present invention is an unsaturated carboxylic acid ester in the presence of a rubbery polymer. A graft copolymer obtained by copolymerizing a monomer, an unsaturated carboxylic acid monomer, an aromatic vinyl monomer, and, if necessary, a monomer mixture composed of other vinyl monomers copolymerized therewith. The rubbery polymer used for the acrylic particles (C1) of the graft copolymer is not particularly limited, and a diene rubber, an acrylic rubber, a vinyl rubber or the like can be used. Specific examples are polybutadiene, styrene-butadiene copolymer, styrene-butadiene block copolymer, acrylonitrile-butadiene copolymer, butyl acrylate-butadiene copolymer, polyiso Pentadiene, butadiene-methyl methacrylate copolymer, butyl acrylate-methyl methacrylate copolymer 'butadiene-ethyl acrylate copolymer, ethylene-propylene copolymer, ethylene-propylene-diene A copolymer, an ethylene-isoprene copolymer, and an ethylene-methyl acrylate copolymer. These rubbery polymers may be used alone or in combination of two or more. Further, when the acrylic particles (C) are added to the optical film of the present invention, the refractive index of the mixture of the acrylic resin (A) and the cellulose ester resin (B) and the acrylic particles are from the viewpoint of obtaining a film having high transparency. The refractive index of C) is close to better. Specifically, the difference in refractive index between the acrylic particles (C) and the acrylic resin (A) is preferably 〇. 5 or less, more preferably 0.02 or less, and particularly preferably 〇 0 1 or less. In order to satisfy such a refractive index condition, the monomer composition ratio of each of the acrylic resin-22-201030080 (A) may be adjusted, and/or the rubbery polymer or single used for the acrylic particle (C) may be adjusted. The method of the composition ratio of the body can reduce the refractive index difference and obtain an optical film excellent in transparency. Here, the refractive index difference means that the optical film of the present invention is sufficiently dissolved in a solvent soluble in the acrylic resin (A) to form a white turbid solution under appropriate conditions, and then separated into a solvent-soluble portion by centrifugation or the like. In the insoluble portion, the soluble portion (acrylic resin (A)) and the insoluble portion (acrylic acid φ particles (C)) were respectively purified to show the difference between the measured refractive index (23 ° C, measurement wavelength: 550 nm). In the present invention, the method of formulating the acrylic particles (C) in the acrylic resin (A) is not particularly limited, and it is preferred to use the acrylic resin (A) and other optional components in advance, usually at 200 to 350 ° C. A method of uniformly adding the acrylic particles (C) while performing uniform melt kneading by a uniaxial or biaxial extruder. Further, a method in which a solution in which acrylic particles (C) are dispersed in advance is added to a solution (dopant) in which an acrylic resin (A) and a cellulose ester resin (B) are dissolved may be used for mixing or acrylic particles ( C) A method in which a solution obtained by dissolving and mixing any of the other additives is added inline or the like. Commercially available products can also be used for the acrylic particles of the present invention. For example, there are metablen W-341 (C2) (manufactured by Mitsubishi Rayon Co., Ltd.), chemisnow MR-2G (C3), and MS-3 00X (C4) (manufactured by Suga Chemical Co., Ltd.). In the optical film of the present invention, it is preferable to contain 0.5 to 30% by mass of the acrylic particles (c), more preferably 1 to 15 15% by mass, based on the total mass of the resin constituting the film, -23 to 201030080. range. <Other Additives> The optical film of the present invention preferably contains a plasticizer that imparts processability to the film, an antioxidant that prevents deterioration of the film, an ultraviolet absorber that imparts an ultraviolet absorbing function, and a fine particle that imparts film slip properties (matting agent) ) and other additives. <Plasticizer> The plasticizer is, for example, a phthalate ester, a fatty acid ester, a trimellitate, a phosphate, a polyester or an epoxy. Among them, polyester-based and phthalate-based plasticizers are preferably used. Although the polyester-based plasticizer has superior non-migration property and extraction resistance to a phthalate-based plasticizer such as dioctyl phthalate, the plasticizing effect and compatibility are slightly inferior. Therefore, these plasticizers can be selected for the purpose of use, or can be applied to a wide range of applications by use. The polyester-based plasticizer is a reactant of a monovalent to tetravalent carboxylic acid and a monovalent to hexavalent alcohol, but mainly obtained by reacting a divalent carboxylic acid with ethylene glycol. Representative divalent carboxylic acids are, for example, glutaric acid, itaconic acid, adipic acid, citric acid, sebacic acid, sebacic acid and the like. In particular, when adipic acid, citric acid or the like is used, it is excellent in plasticizing properties. The ethylene glycol is, for example, ethylene, propylene, 1,3-butene, 1,4-butene, 1,6-hexamethylene, neopentene 'diethylene, triethylene, dipropylene, etc. Ethylene-24-201030080 alcohol. These divalent carboxylic acids and ethylene glycol may each be used singly or in combination. The ester-based plasticizer may be any one of an ester, an oligoester, and a polyester type, and has a molecular weight of from 1 Å to 1,000,000, preferably from 600 to 3,000. Further, although the viscosity of the plasticizer is related to the molecular structure and the molecular weight, in the case of an adipic acid plasticizer, the relationship between the compatibility and the plasticizing efficiency is preferably in the range of 200 to 5000 MPa «s (25 ° C). . In addition, some poly φ vinegar plasticizers can be used. The plasticizer is preferably added in an amount of 0.5 to 30 parts by mass based on 100 parts by mass of the optical film of the invention. When the amount of the plasticizer added exceeds 30 parts by mass, the surface is sticky, and thus it is practically unsatisfactory. (Antioxidant) In the present invention, a known one can be used as the antioxidant. Particularly preferred are lactone-based, sulfur-based, phenol-based, double-bonded, hindered amine φ-based, and phosphorus-based compounds. For example, it is preferably a commercial product containing the trade names "I r g a f 〇 s X P 4 0 " and "I r g a f o s X P 6 0 " of Ciba Japan Co., Ltd. The phenolic compound is preferably a structure having a 2,6-dialkylphenol. For example, there is a trade name of "Irganox 1 076", "IrganoxlOlO", or "ADEKA" ADEKASTAB AO-50 by Ciba Japan Co., Ltd. Commercially available.

上述磷系化合物較佳爲例如有住友化學股份公司 “SumilizerGP”、股份公司 ADEKA 之商品名 “ADK STAB -25- 201030080 PEP-24G”、“ADK STAB P EP - 3 6，，及 “ A D K STAB 3010，，、 Ciba Japan股份公司之商品名“IRGAFOS P-EPQ”、堺化學工業股份公司之商品名“GSY-P1 01”之市售品。上述受阻胺系化合物較佳爲例如有Ciba Japan股份公司之商品名“Tinuvinl44”及“Tinuvin770”、股份公司 ADEKA之商品名“ADK STAB LA-52” 所市售者。上述硫系化合物較佳爲例如有住友化學股份公司之商品名 “Sumilizer TPL-R”及 “Sumilizer TP-D”所市售者。上述雙鍵系化合物較佳爲例如有住友化學股份公司之商品名 “Sumilizer GM”及 “Sumilizer GS”所市售者。酸捕捉劑爲可含有如美國專利第4，1 37,20 1號說明書所記載之具有環氧基的化合物。這些抗氧化劑等係配合再生使用時之步驟決定適當的添加量，但是一般相對於薄膜之主原料的樹脂添加 0.05〜20質量％，較佳爲0.1〜1質量％的範圍。這些抗氧化劑相較於使用單獨一種，不如倂用數種不同體系的化合物，可得到相乘效果。例如較佳爲倂用內酯系、磷系、酚系及雙鍵系化合物。 <著色劑> 本發明較佳爲使用著色劑。著色劑係指染料或顏料―，但是本發明係指具有使液晶畫面之色調形成藍色調的效果或調整黃色指數、降低霧度者。著色劑可使用各種染料、顏料，較佳爲蒽醌染料、偶 •26- 201030080 氮染料、酞青顏料等。 <紫外線吸收劑> 本發明所使用之紫外線吸收劑，其並無特別限制，例如有氧基二苯甲酮系化合物、苯并三唑系化合物、水楊酸酯系化合物、二苯甲酮系化合物、氰基丙烯酸酯系化合物、三嗪系化合物、鎳錯鹽系化合物、無機粉體等。也可 ❹ 爲高分子型紫外線吸收劑。 <消光劑> 本發明爲了賦予薄膜之滑性，以添加消光劑較佳。本發明可使用的消光劑只要是不影響所得之薄膜的透明性，熔融時具有耐熱性時’可爲無機化合物或有機化合物’例如有滑石、雲母、沸石、矽藻土、燒成矽酸鈣、高嶺土、絹雲母、膨潤土、蒙脫石、黏土、二氧化矽'石英參粉末、玻璃珠、玻璃粉、玻璃片、中玻璃纖維、砍灰石 (Wollastonite)、氮化硼、碳化硼、硼化鈦、碳酸鎂、重質碳酸與、輕質碳酸15、砂酸銘、较酸銘、砂酸鎂、銘砂酸鎂、二氧化鋁、二氧化矽、氧化鋅、二氧化鈦、氧化鐵、氧化鎂、氧化锆、氫氧化鋁、氫氧化鈣、氫氧化鎂、硫酸鈣、硫酸鋇、碳化矽、碳化鋁、碳化鈦、氮化鋁、氮化矽、氮化鈦、白碳等。這些消光劑可單獨或倂用兩種以上使用。可倂用粒徑或形狀（例如針狀與球狀等）之不同粒子， -27- 201030080 藉以兼具高度的透明性與滑性。這些當中，因與纖維素酯之折射率相近，因此特佳爲使用透明性（霧度）優異的二氧化矽。二氧化矽的具體例可使用具有Aerosil 200V、Aerosil R972V、Aerosil R972、R974、R812、200、300、R202、 0X50、TT600、NAX50(以上日本 Aerosil(股）製）、 SEAHOSTAR KEP-10、SEAHOSTAR KEP-30、 SEAHOSTAR K E P - 5 0 (以上、股份公司日本觸媒製）、 S y 1 〇ph ob i c 1 0 0 (富士 S i 1 y si a 製）、ni p s e al E2 2 0 A(日本 Silica 工業製）、ADMAFINE SO(admatechs 製）等之商品名的市售品等。粒子的形狀例如可使用不定形、針狀、扁平、球狀等，無特別限定，特別是使用球狀粒子時，所得之薄膜的透明性良好，因此較佳。粒子之大小係因接近可見光之波長時，光產生散射，透明性變差，因此小於可見光之波長爲佳，在可見光之波長之1 /2以下更佳。粒子之大小爲過小時，有時無法改善滑性，因此特佳爲80nm~180nm的範圍。粒子之大小係粒子爲1次粒子的凝集體時，係指凝集體的大小。又，粒子爲非球狀時，相當於其投影面積之圓的直徑。 (黏度降低劑）本發明中，以減低熔融黏度爲目的，可添加氫鍵性溶 -28- 201030080 劑。所謂氫鍵性溶劑係指如J_N. Israelachvili著、「分子間力與表面力j (近藤保、大島廣行翻譯，McGraw-Hill 出版、1991年）所記載的電負性原子（氧、氮、氟、氯）與電負性原子經共價鍵之氫原子間所產生，可產生氫原子介質「鍵」之有機溶劑，即鍵力距較大，且含氫的鍵，例如含有0-H(氧氫鍵）、N-H(氮氫鍵）、F-H(氟氫鍵），可使接近之分子彼此排列的有機溶劑。 φ 這些具有相較於纖維素樹脂之分子間氫鍵，在與纖維素之間形成更強氫鍵之能力者，本發明所進行的熔融流延法係相較於使用之纖維素樹脂單獨之玻璃轉化溫度，藉由添加氫鍵性溶劑，可使纖維素樹脂組成物之熔融溫度更低，或相同熔融溫度下，相較於纖維素樹脂，能使含有氫鍵性溶劑之纖維素樹脂組成物之熔融黏度更低。本發明中，脆性的指標係藉由是否爲「不會引起延性破壞之光學薄膜」的基準來判斷。可得到不會引起延性破 φ 壞、改善脆性的光學薄膜，於製作大型液晶顯示裝置用之偏光板時，可得到製造時不會發生斷裂或龜裂，操作性優異的光學薄膜。在此延性破壞係定義爲相較於某材料所具有的強度，因更大應力作用產生的斷裂，且最終斷裂前，會伴隨材料明顯之延伸及收縮的破壞。本發明中，是否爲「不會引起延性破壞之光學薄膜」係藉由即使將薄膜折彎成2之較大應力作用，也無斷裂等之破壞來評估（此評估稱爲耐折度）。即使施加這種較大應力也不會產生延性破壞的光學 -29 - 201030080 薄膜時，即使作爲大型化液晶顯示裝置用的偏光板保護薄膜使用時，也可充分減少製造時斷裂等問題，此外，即使一度貼合後，再剝離使用光學薄膜時，也不會發生斷裂，可充分適用於光學薄膜之薄型化。耐折度爲50〜100次時，即使作爲大型化液晶顯示裝置用之偏光板保護薄膜使用時，也可充分降低製造時之斷裂的問題，即使一度貼合後，再剝離使用光學薄膜時，也不會發生斷裂，可充分適用於光學薄膜之薄型化。耐折度未達50次時，製造時容易產生斷裂，且再加工性差。又超過100次時，增加膜厚可達成，但是不適用於液晶顯示裝置之薄型化。因此，薄膜薄膜的情況，較適合爲 5 0 ~ 1 0 0 次。本發明中，耐熱性的指標爲使用張力軟化點。隨著液晶顯示裝置大型化，背光光源的亮度日益提高，以及數字標牌等用於屋外用途，而要求更高亮度，因此光學薄膜需要具有耐更高溫環境下使用，但張力軟化點爲l〇5~145°C 時，可判斷爲具有充分的耐熱性。特佳爲控制於 110〜130 °C。張力軟化點未達°C時，無法耐背光光源所產生的熱量，薄膜產生變形或容易漏光。此外’以相溶狀態含有丙烯酸樹脂（A)與纖維素酯樹脂（B)的構成’僅能確認至145°C。因此，張力軟化點較佳爲l〇5°C~l45°C。顯示光學薄膜之張力軟化點之溫度的具體測定方法，例如使用萬能拉力測試機（Tensilon)(ORIENTEC公司製 RTC- 1 225A)，將光學薄膜切成120mm(長）x l〇mm(寬）後， 201030080 以10N的張力拉伸，同時以3〇°C/min之升溫速度繼續升溫’到達9N的時點的溫度測定3次，求其平均値。又’從耐熱性的觀點，光學薄膜之玻璃轉化溫度（Tg) 較佳爲110°C以上。更佳爲120°C以上，特佳爲150°C以上。此處所謂的玻璃轉化溫度係指使用差示掃描熱量測定器（Perkin Elmer公司製D S C - 7型），以升溫速度20t/分 φ 鐘進行測定後，依據 JIS K7 1 2 1 (1 987)所得的中間點玻璃轉化溫度（Tmg)。判斷本發明之光學薄膜之透明性的指標係使用霧度値 (濁度）。特別是屋外使用之液晶顯示裝置，即使於明亮場所’也要求能得到充分亮度及高對比，因此，霧度値必須爲1.0%以下，更佳爲0.5%以下。依據含有丙烯酸系樹脂（A)及纖維素酯樹脂（B)之本發明的光學薄膜可得到高透明性，但爲了改善其他物性，而 φ 使用丙烯酸粒子時，以縮小樹脂（丙烯酸系樹脂（A)與纖維素酯樹脂（B))與丙烯酸粒子（C)之折射率差，可防止霧度値上升。此外，表面之粗糙度也會以表面霧度的形態影響霧度値’因此，可藉由將丙烯酸粒子（C)之粒徑及添加量抑制於前述範圍內及縮小製膜時之薄膜接觸部之表面粗糙度。又，本發明之光學薄膜的吸濕性可藉由相對於濕度變化之尺寸變化來評估。相對於濕度變化之尺寸變化的評估方法可使用下述方 -31 - 201030080 法。於製作後之光學薄膜的流延方向，2處作記號（十字）’在60°C、90%RH下處理1〇〇〇小時，使用光學顯微鏡測定處理前及處理後之記號（十字）的距離，求得尺寸變化率（％)。尺寸變化率（％)係以下述式所示。尺寸變化率（％) = [(al-a2)/al]x 100 al:熱處理前之距離 a2:熱處理後之距離以光學薄膜作爲液晶顯示裝置之偏光板用保護薄膜使用時，因吸濕之尺寸變化，使光學薄膜發生斑點或相位差値的變化，產生對比降低及色斑等的問題。特別是用於屋外使用之液晶顯示裝置的偏光板保護薄膜時，上述問題更明顯。但上述條件之尺寸變化率（％)未達0.5%時，評估爲顯示充分低吸濕性的光學薄膜。更佳爲未達0.3%。又，本發明之光學薄膜係薄膜面內之直徑5μηι以上的缺點較佳爲1個/l〇cm四方以下，更佳爲0.5個/10cm 四方以下，特佳爲0.1個/10cm四方以下。缺點之直徑係指缺點爲圓形時表示其直徑，非圓形時可利用下述方法使用顯微鏡觀察缺點的範圍後決定其最大徑（外接圓的直徑）。缺點的範圍係當缺點爲氣泡或異物時，係指以微分干擾顯微鏡之透過光線觀察缺點時之影子的大小。缺點爲滾筒傷痕之轉印或擦傷等表面形狀的變化時，可以微分干擾顯微鏡之反射光觀察缺點確認大小。 -32- 201030080 又’以反射光觀察時，若缺點大小不明確時，可在表面蒸鍍鋁或鈾再觀察。欲以生產性良好得到以該缺點頻度表示之品質優良的薄膜時’可在流延前以高精度過濾聚合物溶液、或提高流延機周邊之清淨度’或階段性設定流延後的乾燥條件，可有效率且抑制發泡進行乾燥。缺點個數多於1個/10cm四方時，例如於後步驟之加 φ 工時等，對薄膜施加張力時，有時以缺點爲基點，薄膜斷裂’生產性降低。又’缺點直徑爲5 μιη以上時，偏光板觀察等可以目視確認，作爲光學構件使用時，有時會產生売點。此外’無法以目視確認時，在該薄膜上形成硬化層等時，有時塗劑無法均勻形成，造成缺點（未確實塗佈）的情形。在此缺點係指在溶液製膜之乾燥步驟中，因溶劑急速蒸發所產生之薄膜中的空洞（發泡缺點）或製膜原液中之異 φ 物或混入製膜中之異物所產生之薄膜中的異物（異物缺點）。本發明之光學薄膜係依據JIS-K7 127-1 999所測定，至少一方向之斷裂伸度較佳爲10%以上，更佳爲20%以上。斷裂伸度之上限並無特別限制，現實上爲約250%。爲了增大斷裂伸度時，可抑制因異物或發泡所產生之薄膜中的缺點。本發明之光學薄膜的厚度較佳爲20μιη以上，更佳爲 -33- 201030080 3 0μιη以上。本發明之光學薄膜，其全光線透過率較佳爲90%以上，更佳爲93 %以上。又現實的上限爲99%。爲了達成以該全光線透過率所表示之優良透明性時，可藉由不要導入會吸收可見光之添加劑及共聚合成份、或以高精度過濾去除聚合物中的異物，或降低薄膜內部之光的擴散或吸收。本發明之光學薄膜滿足上述物性時，特別適合作爲大保板光偏的用置裝示顯晶液之途用外屋或置裝。示用顯使晶膜液薄型護 <藉由熔融流延製膜方法之光學薄膜的製造方法> 本發明之光學薄膜之製造方法係將以95 : 5〜30 : 70 之質量比含有丙烯酸樹脂（Α)與纖維素酯樹脂（Β)者進行熔融，自模中擠壓流延至冷卻輥上之光學薄膜的製造方法。以下說明製造方法之整體。 <熔融顆粒製造步驟> 熔融擠壓用之由丙烯酸樹脂（Α)、纖維素酯樹脂（Β)、其他添加劑所構成之構成光學薄膜的組成物，通常預先混練形成顆粒化較佳。顆粒化可爲已知的方法，例如將乾燥丙烯酸樹脂 (Α) '乾燥纖維素酯樹脂（Β)或其他添加劑利用供料器供給擠壓機，利用單軸或雙軸擠壓機混練後，由模中擠出絲狀，再以水冷或空冷，進行切斷。 -34- 201030080 爲了防止原材料分解，於擠壓前將原材料乾燥很重要。特別是纖維素酯易吸濕，因此使用除濕熱風乾燥機或真空乾燥機，以70〜140。(：乾燥3小時以上，使水分率成爲 2 00PPm以下’更佳爲i〇〇ppm以下。添加劑可於供給擠壓機之前先行混合，或分別以各自之供料器供給。爲了均勻混合，於事前混合抗氧化劑等少量的添加劑較佳。參混合抗氧化劑時可爲固體彼此混合，必要時可將抗氧化劑溶解於溶劑中’再含浸於丙烯酸樹脂（A)、纖維素酯樹脂（B)中混合，或噴霧混合。真空諾塔混合機等可同時乾燥及混合，故較佳。又，供料器或由模之出口等與接觸空氣時，形成除濕空氣或除濕後之N2氣體等氣氛較佳。擠壓機係抑制剪斷力，爲了避免樹脂劣化（分子量降低、著色、生成凝膠等）’顆粒化盡可能在低溫下加工。 φ 例如雙軸擠壓機時’較佳爲使用深溝型螺杆，以同方向轉動爲佳。從混練均勻性的觀點，較佳爲咬合型。使用以上所得的顆粒進行薄膜製膜。也可未經顆粒化’直接以供料器將原材料粉末供給擠壓機，直接進行薄膜製膜。 <將熔融混合物由模中擠押至冷卻輥的步驟> 將製作後之顆粒使用1軸或2軸型的擠壓機，在進行擠壓時之熔融溫度Tm爲200〜300 °C，以葉片式（leaf disk -35- 201030080 filter)過濾器等過濾除去異物後’由T模共擠壓成薄膜狀，在冷卻輥上固化，與彈性接觸輥壓押的狀態下’進行流延。自供料斗導入至擠壓機時，較佳爲真空下或減壓下或惰性氣體氣氛下，防止氧化分解等。Tm係擠壓機之模出口部分的溫度。模上有損傷或有可塑劑之凝集物等異物附著時，有時會產生條紋狀的缺陷。這種缺陷也稱爲模線，爲了降低模線等之表面缺陷時，由擠壓機至模的配管中，較佳爲形成盡可能減少樹脂之滯留部的構造。僅可能使用模之內部或模唇上無損傷等者。擠壓機或模等與熔融樹脂接觸的內面，較佳爲降低表面粗度或使用表面能較低的材質等，或實施不易附著熔融樹脂的表面加工。具體而言，例如將硬銨鉻或陶瓷溶射者硏磨使其表面粗度成爲0.2S以下者。本發明之冷卻輥並無特別限制，可爲高剛性金屬輥，內部具備流通可控制溫度之熱介質或冷介質之構造的輥，大小不受限，只要是能充分冷卻被熔融擠出之薄膜的大小即可，通常冷卻輥之直徑爲l〇〇mm〜lm。冷卻輥之表面材質可爲碳鋼、不銹鋼、鋁、鈦等。又爲了提升表面硬度，或改良與樹脂之剝離性，較佳爲實施電鑛硬鉻、電鑛鎳、電鍍非晶質鉻等，或陶瓷溶射等的表面處理。冷卻輥表面之表面粗糙度Ra較佳爲0.1 μιη以下，更 -36- 201030080 佳爲0·05μπι以下。輥表面越平滑時，所得薄膜之表面也越平滑。當然又以表面加工後的表面再硏磨，成爲上述表面粗糙度較佳。本發明之彈性接觸輥可使用如特開平03-124425號、特開平08-224772號、特開平07- 1 00960號、特開平10-272676 號、WO97-028950、特開平 1 1-235747 號、特開 2002-36332 號、特開 2005-1 72940 號或特開 2005-2802 1 7 φ 號所記載之表面爲薄膜金屬套管被覆矽橡膠輥。薄膜由冷卻輥剝離時，較佳爲抑制張力，防止薄膜變形。 <延伸步驟> 本發明中，如上述所得之薄膜通過與冷卻輥接觸之步驟後，較佳爲在至少一方向延伸1.01〜3.0倍。藉由延伸可實現本發明之脆性。 • 較佳爲在縱（薄膜搬送方向）、橫（寬度方向）兩方向各自延伸1. 1~2.0倍》延伸方法較佳爲使用已知的輥延伸機及拉幅器等。特別是光學薄膜兼具偏光板保護薄膜時，延伸方向爲寬度方向，與偏光薄膜之層合爲輥形態，故較佳。在寬度方向進行延伸，光學薄膜之遲相軸爲寬度方向。通常、延伸倍率爲1.1〜3.0倍，較佳爲1.2〜1.5倍，延伸溫度通常爲構成薄膜之樹脂的Tg~Tg + 50°C，較佳爲 -37- 201030080The phosphorus-based compound is preferably, for example, Sumitomo Chemical Co., Ltd. "Sumilizer GP", the company name "ADEK STAB -25-201030080 PEP-24G", "ADK STAB P EP - 3 6, and " ADK STAB 3010". ,, the product name of "IGAGASOS P-EPQ" of Ciba Japan Co., Ltd., and the trade name of "GSY-P1 01" of the company. The hindered amine-based compound is preferably sold under the trade names "Tinuvinl 44" and "Tinuvin 770" of Ciba Japan Co., Ltd., and the trade name "ADK STAB LA-52" of the company ADEKA. The above-mentioned sulfur-based compound is preferably, for example, commercially available from Sumitomo Chemical Co., Ltd. under the trade names "Sumilizer TPL-R" and "Sumilizer TP-D". The above double bond compound is preferably commercially available, for example, from Sumitomo Chemical Co., Ltd. under the trade names "Sumilizer GM" and "Sumilizer GS". The acid scavenger is a compound having an epoxy group as described in the specification of U.S. Patent No. 4,1,37,20. These antioxidants and the like are used in combination with the step of regenerating to determine an appropriate addition amount, but it is generally added in an amount of 0.05 to 20% by mass, preferably 0.1 to 1% by mass based on the resin of the main raw material of the film. These antioxidants can be multiplied compared to the use of a single compound which is not as good as several different systems. For example, a lactone-based, phosphorus-based, phenol-based or double-bonded compound is preferred. <Colorant> The present invention preferably uses a colorant. The coloring agent means a dye or a pigment, but the present invention means an effect of causing a hue of a liquid crystal screen to form a blue hue or adjusting a yellowness index and reducing haze. As the colorant, various dyes and pigments can be used, and preferably an anthraquinone dye, an even 26-201030080 nitrogen dye, an indigo pigment, or the like. <Ultraviolet absorber> The ultraviolet absorber used in the present invention is not particularly limited, and examples thereof include an oxybenzophenone-based compound, a benzotriazole-based compound, a salicylate-based compound, and a diphenyl group. A ketone compound, a cyanoacrylate compound, a triazine compound, a nickel stear salt compound, an inorganic powder or the like. It can also be a polymeric UV absorber. <Matting Agent> In order to impart slipperiness to the film, it is preferred to add a matting agent. The matting agent which can be used in the present invention does not affect the transparency of the obtained film, and when it has heat resistance upon melting, it can be an inorganic compound or an organic compound such as talc, mica, zeolite, diatomaceous earth, or calcined calcium citrate. , kaolin, sericite, bentonite, montmorillonite, clay, cerium oxide 'quartz ginseng powder, glass beads, glass powder, glass flakes, medium glass fiber, ash stone (Wollastonite), boron nitride, boron carbide, boron Titanium, magnesium carbonate, heavy carbonic acid and light carbonic acid 15, sand acid Ming, acid, magnesium silicate, magnesium sulphate, alumina, cerium oxide, zinc oxide, titanium dioxide, iron oxide, oxidation Magnesium, zirconia, aluminum hydroxide, calcium hydroxide, magnesium hydroxide, calcium sulfate, barium sulfate, tantalum carbide, aluminum carbide, titanium carbide, aluminum nitride, tantalum nitride, titanium nitride, white carbon, and the like. These matting agents can be used singly or in combination of two or more. Different particles of particle size or shape (such as needles and spheres) can be used, -27- 201030080 to have a high degree of transparency and slip. Among these, since the refractive index of the cellulose ester is similar, it is particularly preferable to use cerium oxide having excellent transparency (haze). Specific examples of cerium oxide may be used with Aerosil 200V, Aerosil R972V, Aerosil R972, R974, R812, 200, 300, R202, 0X50, TT600, NAX50 (made by Japan Aerosil Co., Ltd.), SEAHOSTAR KEP-10, SEAHOSTAR KEP -30, SEAHOSTAR KEP - 5 0 (above, the company's Japanese catalyst system), S y 1 〇ph ob ic 1 0 0 (Fuji S i 1 y si a system), ni pse al E2 2 0 A (Japan Silica Commercial products, and commercial products such as ADMAFINE SO (admatechs). The shape of the particles can be, for example, an amorphous shape, a needle shape, a flat shape, a spherical shape, or the like, and is not particularly limited. Particularly, when spherical particles are used, the obtained film has good transparency, which is preferable. When the size of the particles is close to the wavelength of visible light, light is scattered and the transparency is deteriorated. Therefore, the wavelength of the particles is preferably smaller than the wavelength of visible light, and more preferably 1 or less of the wavelength of visible light. When the size of the particles is too small, the slip property may not be improved, so that it is particularly preferably in the range of 80 nm to 180 nm. When the particle size is a confluence of primary particles, it means the size of the aggregate. Further, when the particles are non-spherical, they correspond to the diameter of the circle of the projected area. (Viscosity reducing agent) In the present invention, a hydrogen bond-soluble -28-201030080 agent can be added for the purpose of reducing the melt viscosity. The hydrogen-bonding solvent refers to an electronegative atom (oxygen, nitrogen, fluorine) as described in J_N. Israelachvili, "Intermolecular Forces and Surface Forces j (Kondo, Oshima Hiroshima, McGraw-Hill, 1991). , chlorine) and an electronegative atom generated by a covalent bond between hydrogen atoms, can produce a hydrogen atomic medium "bond" of the organic solvent, that is, a bond with a large distance, and a hydrogen-containing bond, for example, contains 0-H ( An oxygen-hydrogen bond, NH (nitrogen-hydrogen bond), and FH (fluorine-hydrogen bond) are organic solvents in which close molecules are arranged. φ These have the ability to form stronger hydrogen bonds with cellulose than the intermolecular hydrogen bonds of the cellulose resin, and the melt casting method carried out by the present invention is separate from the cellulose resin used alone. Glass transition temperature, by adding a hydrogen bonding solvent, the melting temperature of the cellulose resin composition can be made lower, or the cellulose resin containing a hydrogen bonding solvent can be composed at a same melting temperature as compared with the cellulose resin. The melt viscosity of the substance is lower. In the present invention, the index of brittleness is judged by whether or not it is a "optical film which does not cause ductile damage". An optical film which does not cause ductile fracture and improves brittleness can be obtained. When a polarizing plate for a large liquid crystal display device is produced, an optical film which does not cause cracking or cracking during production and which has excellent handleability can be obtained. In this ductile failure system is defined as the fracture caused by the action of a larger stress than the strength of a material, and the damage of the material is obviously accompanied by the extension and shrinkage of the material before the final fracture. In the present invention, whether or not the "optical film which does not cause ductile damage" is evaluated by the fact that even if the film is bent to a large stress of 2, no damage such as breakage is evaluated (this evaluation is called folding resistance). Even when an optical -29 - 201030080 film which does not cause ductile damage is applied even when such a large stress is applied, even when it is used as a polarizing plate protective film for a large-sized liquid crystal display device, problems such as breakage during production can be sufficiently reduced. Even when the optical film is peeled off once after bonding, the film is not broken, and it can be sufficiently applied to the thinning of the optical film. When the folding resistance is 50 to 100 times, even when used as a polarizing plate protective film for a large-sized liquid crystal display device, the problem of breakage during production can be sufficiently reduced, and even when the optical film is peeled off after being bonded once, It also does not break, and is sufficiently suitable for thinning of an optical film. When the folding resistance is less than 50 times, breakage is likely to occur during production, and the reworkability is poor. When the number is more than 100 times, the film thickness can be increased, but it is not suitable for the thinning of the liquid crystal display device. Therefore, in the case of a thin film film, it is more suitable for 50 to 1000 times. In the present invention, the index of heat resistance is the use of a tension softening point. With the large-scale liquid crystal display device, the brightness of the backlight source is increasing, and the digital signage is used for outdoor use, and higher brightness is required, the optical film needs to be used in a higher temperature environment, but the tension softening point is l〇5. When it is ~145 ° C, it can be judged that it has sufficient heat resistance. It is especially suitable for control at 110~130 °C. When the tension softening point is less than °C, the heat generated by the backlight source cannot be withstood, and the film is deformed or easily leaked. Further, the constitution of the acrylic resin (A) and the cellulose ester resin (B) in a compatible state was confirmed only to 145 °C. Therefore, the tension softening point is preferably from 10 ° C to 14 ° C. A specific measurement method for displaying the temperature at the tension softening point of the optical film, for example, using a universal tensile tester (Tensilon) (RTC-1 225A, manufactured by ORIENTEC Co., Ltd.), and cutting the optical film into 120 mm (length) x l 〇 mm (width), 201030080 Tensile at a tension of 10 N while continuing to raise the temperature at a temperature increase rate of 3 ° C/min. The temperature at the time of reaching 9 N was measured three times, and the average enthalpy was determined. Further, from the viewpoint of heat resistance, the glass transition temperature (Tg) of the optical film is preferably 110 ° C or higher. More preferably, it is 120 ° C or more, and particularly preferably 150 ° C or more. Here, the glass transition temperature is measured by a differential scanning calorimeter (DSC-7 type manufactured by Perkin Elmer Co., Ltd.) at a temperature increase rate of 20 t/min φ, and then obtained according to JIS K7 1 2 1 (1 987). The intermediate point of glass transition temperature (Tmg). The index for judging the transparency of the optical film of the present invention is haze (turbidity). In particular, a liquid crystal display device used outside the house is required to have sufficient brightness and high contrast even in a bright field. Therefore, the haze 値 must be 1.0% or less, more preferably 0.5% or less. According to the optical film of the present invention containing the acrylic resin (A) and the cellulose ester resin (B), high transparency can be obtained, but in order to improve other physical properties, when acryl particles are used, the resin (acrylic resin) is used. The difference in refractive index between the cellulose ester resin (B) and the acrylic particles (C) prevents the haze from rising. In addition, the roughness of the surface also affects the haze in the form of surface haze. Therefore, the particle size and the amount of the acrylic particles (C) can be suppressed within the above range and the film contact portion at the time of film formation can be reduced. Surface roughness. Further, the hygroscopicity of the optical film of the present invention can be evaluated by dimensional change with respect to humidity change. The method of evaluating the dimensional change with respect to the change in humidity may use the following method -31 - 201030080. In the casting direction of the optical film after the production, two marks (cross) were treated at 60 ° C and 90% RH for 1 hour, and the mark (cross) before and after the treatment was measured using an optical microscope. Distance, the rate of change in size (%). The dimensional change rate (%) is represented by the following formula. Dimensional change rate (%) = [(al-a2)/al]x 100 al: distance before heat treatment a2: distance after heat treatment when the optical film is used as a protective film for a polarizing plate of a liquid crystal display device, due to moisture absorption The dimensional change causes the optical film to undergo speckle or phase difference changes, resulting in problems such as contrast reduction and color unevenness. Especially in the case of a polarizing plate protective film for a liquid crystal display device used outdoors, the above problem is more conspicuous. However, when the dimensional change rate (%) of the above conditions was less than 0.5%, it was evaluated as an optical film showing sufficiently low hygroscopicity. More preferably, it is less than 0.3%. Further, the defect of the optical film-based film of the present invention having a diameter of 5 μm or more in the surface is preferably 1 / l 〇 cm square or less, more preferably 0.5 /10 cm square or less, and particularly preferably 0.1 /10 cm square or less. The diameter of the defect means that the diameter is a circular shape, and when it is not circular, the maximum diameter (diameter of the circumscribed circle) can be determined by observing the range of the defect using a microscope by the following method. The disadvantage is that when the defect is a bubble or a foreign matter, it refers to the size of the shadow when the defect is observed by the differential light of the microscope. The disadvantage is that when the surface shape changes such as transfer or scratch of the roller flaw, the reflected light of the microscope can be differentially observed to confirm the size. -32- 201030080 In addition, when observing light, if the size of the defect is not clear, aluminum or uranium may be vapor deposited on the surface and observed. When it is desired to obtain a film of excellent quality represented by the frequency of the defect with good productivity, 'the polymer solution can be filtered with high precision before casting, or the cleanness of the periphery of the casting machine can be improved' or the drying after casting can be set in stages. Conditions can be efficiently and inhibit foaming for drying. When the number of the defects is more than one /10 cm square, for example, when the tension is applied to the film in the subsequent step, when the tension is applied to the film, the film may be broken and the productivity may be lowered. Further, when the diameter of the defect is 5 μm or more, the observation of the polarizing plate or the like can be visually confirmed, and when used as an optical member, defects may occur. Further, when it is not possible to visually confirm that a hardened layer or the like is formed on the film, the coating agent may not be uniformly formed, which may cause a defect (not surely applied). The disadvantages herein refer to voids in the film (foaming defects) caused by rapid evaporation of the solvent in the drying step of the solution film formation, or a film produced by the foreign matter in the film forming solution or the foreign matter mixed in the film forming film. Foreign matter in the middle (foreign foreign matter). The optical film of the present invention has an elongation at break in at least one direction of preferably 10% or more, more preferably 20% or more, as measured in accordance with JIS-K7 127-1999. The upper limit of the elongation at break is not particularly limited, and is actually about 250%. In order to increase the elongation at break, defects in the film due to foreign matter or foaming can be suppressed. The thickness of the optical film of the present invention is preferably 20 μm or more, more preferably -33 to 201030080 3 0 μm or more. The optical film of the present invention preferably has a total light transmittance of 90% or more, more preferably 93% or more. The upper limit of reality is 99%. In order to achieve excellent transparency represented by the total light transmittance, it is possible to reduce the foreign matter in the polymer or to reduce the light inside the film by not introducing an additive or a copolymerizable component that absorbs visible light, or filtering it with high precision. Diffusion or absorption. When the optical film of the present invention satisfies the above physical properties, it is particularly suitable for use as a large-scale substrate for the display of the display liquid crystal. The present invention relates to a method for producing an optical film by a melt casting film forming method. The method for producing an optical film of the present invention comprises acrylic acid in a mass ratio of 95:5 to 30:70. A method of producing an optical film in which a resin (yttrium) and a cellulose ester resin are melted and extruded from a mold onto a cooling roll. The entire manufacturing method will be described below. <Step of Producing Molten Particles> The composition constituting the optical film composed of an acrylic resin, a cellulose ester resin, and other additives for melt extrusion is usually mixed in advance to form granules. The granulation may be a known method, for example, after drying a dry acrylic resin (dry) cellulose ester resin (Β) or other additives to a press using a feeder, after being kneaded by a single-axis or a double-axis extruder, The wire is extruded from the mold, and then cut off by water cooling or air cooling. -34- 201030080 In order to prevent the decomposition of raw materials, it is important to dry the raw materials before extrusion. In particular, the cellulose ester is hygroscopic, so a dehumidifying hot air dryer or a vacuum dryer is used, 70 to 140. (: drying for 3 hours or more, so that the water content is less than 200 ppm or less 'more preferably i 〇〇 ppm or less. The additives may be mixed before being supplied to the extruder, or separately supplied by respective feeders. For uniform mixing, It is preferred to mix a small amount of an additive such as an antioxidant beforehand. When the antioxidant is mixed, the solid may be mixed with each other, and if necessary, the antioxidant may be dissolved in a solvent to be further impregnated with the acrylic resin (A) and the cellulose ester resin (B). Mixing, or spray mixing. Vacuum Nouta mixer can be dried and mixed at the same time, so it is better. Also, when the feeder or the outlet of the mold is in contact with air, the atmosphere such as dehumidified air or dehumidified N2 gas is formed. Preferably, the extruder suppresses the shearing force, in order to avoid resin degradation (molecular weight reduction, coloring, gel formation, etc.) 'granulation is processed as low temperature as possible. φ For example, in a twin-screw extruder, it is better to use a deep groove. The type of screw is preferably rotated in the same direction. From the viewpoint of kneading uniformity, the bite type is preferred. The film obtained by the above-mentioned particles is used for film formation. The raw material powder is supplied to the extruder by a feeder, and the film is directly formed into a film. <Step of extruding the molten mixture from the mold to the cooling roll> Using the 1- or 2-axis type extrusion of the produced pellet The melt temperature Tm at the time of extrusion is 200 to 300 ° C, and is filtered by a blade type (leaf disk -35 - 201030080 filter) filter to remove foreign matter, and then co-extruded into a film shape by a T die, and is cooled. The roll is solidified and cast in a state of being pressed against the elastic contact roll. When the feed hopper is introduced into the extruder, it is preferably under vacuum or under reduced pressure or under an inert gas atmosphere to prevent oxidative decomposition, etc. Tm extrusion The temperature at the exit portion of the die of the press. When foreign matter such as damage or agglomerates of plasticizer adheres to the mold, streaky defects may occur. This defect is also called a mold line, in order to reduce the surface of the mold line or the like. In the case of a defect, it is preferable to form a structure in which the resin retaining portion is as small as possible in the piping from the extruder to the mold. It is only possible to use the inside of the mold or the mold lip without damage, etc. The extruder or the mold and the like are melted. The inner surface of the resin contact is preferably A surface roughness of a low surface roughness or a low surface energy, or surface processing which does not adhere to a molten resin is carried out. Specifically, for example, hard ammonium chrome or a ceramic sprayer is honed to have a surface roughness of 0.2 S or less. The chill roll of the present invention is not particularly limited, and may be a high-rigidity metal roll having a structure in which a heat medium or a cold medium having a controllable temperature is passed, and the size is not limited as long as it is capable of sufficiently cooling the film which is melt-extruded. The size of the cooling roller is usually l〇〇mm~lm. The surface of the cooling roller can be carbon steel, stainless steel, aluminum, titanium, etc. In order to improve the surface hardness or improve the peelability of the resin, The surface treatment of hard chrome, electro-mineral nickel, electroplated amorphous chromium, etc., or ceramic spray, etc. The surface roughness Ra of the surface of the chill roll is preferably 0.1 μm or less, more preferably -36-201030080 ·05μπι or less. The smoother the surface of the roll, the smoother the surface of the resulting film. Of course, the surface after surface processing is further honed to have a better surface roughness. The elastic contact roller of the present invention can be used, for example, in Japanese Laid-Open Patent Publication No. Hei 03-124425, No. Hei 08-224772, No. Hei 07-00 960, No. Hei 10-272676, WO 97-028950, and No. 1 1-235747. The surface described in JP-A-2002-36332, JP-A-2005-1 72940 or JP-A-2005-2802 1 7 φ is a film metal sleeve coated with a rubber roller. When the film is peeled off by the cooling roll, it is preferable to suppress the tension and prevent the film from being deformed. <Extension Step> In the present invention, after the film obtained as described above is passed through the step of contacting the cooling roll, it is preferably extended in at least one direction by 1.01 to 3.0 times. The brittleness of the present invention can be achieved by extension. Preferably, the extension method is preferably 1. 1 to 2.0 times in both the longitudinal direction (film transport direction) and the lateral direction (width direction). The extension method preferably uses a known roll stretcher and tenter. In particular, when the optical film has a polarizing plate protective film, the extending direction is the width direction, and the polarizing film is laminated in the form of a roll, which is preferable. Extending in the width direction, the retardation axis of the optical film is in the width direction. Usually, the stretching ratio is 1.1 to 3.0 times, preferably 1.2 to 1.5 times, and the stretching temperature is usually Tg to Tg + 50 ° C of the resin constituting the film, preferably -37 to 201030080.

Tg〜Tg + 50°c的溫度範圍內進行。延伸係在長度方向或寬度方向被控制之均勻溫度分布下進行延伸較佳。較佳爲±2 °C以內’更佳爲± 1 °C以內’特佳爲±0.5 °C以內。爲了以上述方法所製作之光學薄膜之延遲調整或降低尺寸變化率，可將薄膜在長度方向或寬度方向產生收縮。欲在長度方向產生收縮時，例如寬度延伸暫時夾具鬆開，於長度方向上鬆弛或橫延伸機之相鄰相之夾具之間隔慢慢縮小，使薄膜收縮的方法。遲相軸方向之均勻性也重要，相對於薄膜寬度方向，角度較佳爲-5~ + 5°，更佳爲-1~+Γ之範圍，特佳爲-〇·5~ + 0.5°之範圍，特佳爲-0.1 ~ +0.1°之範圍。此等之偏差係可藉由使延伸條件最佳化來達成。本發明之光學薄膜係由鄰接之山之頂點至谷之底點的高度爲300nm以上，斜率爲3 00nm/mm以上之長度方向上無連續的條紋較佳。條紋的形狀係使用表面粗度計測定，具體而言，使用 Mitutoyo製SV-3100S4，前端形狀爲圓錐60°、前端曲率半徑2μιη之觸針（鑽石針）施加測定力0.7 5mN之荷重，以測定速度l.Omm/sec在薄膜之寬度方向進行掃描，作爲Z 軸（厚度方向）分解能0.001 μιη測定剖面曲線。由此曲線可知，條紋之高度係讀取由山之頂點至谷之底點的垂直距離（Η)。條紋之斜率係讀取由山之頂點至谷之底點的水平距離（L)，垂直距離（Η)除以水平距離（L)而 201030080 得。 <含有溶劑量> 本發明之光學薄膜係藉由熔融流延製膜方法製作，因此以輥狀薄膜捲繞的時點，含有的溶劑量爲0.0 1質量％以下。含有溶劑量可藉由下述方法測定。將各試料置入20ml之密閉玻璃容器內，以下述頂部 φ 空間加熱條件處理後，以下述氣體色譜對於預先使用的溶劑製作檢量線來測定。含有溶劑量係以相對於光學薄膜之整體質量之質量份表示。It is carried out in a temperature range of Tg to Tg + 50 °C. The extension is preferably extended in a uniform temperature distribution in which the length direction or the width direction is controlled. It is preferably within ±2 °C, more preferably within ±1 °C, and particularly preferably within ±0.5 °C. In order to adjust the retardation of the optical film produced by the above method or to reduce the dimensional change rate, the film may be shrunk in the longitudinal direction or the width direction. When it is desired to cause shrinkage in the longitudinal direction, for example, the width extension temporary jig is loosened, and the interval in which the longitudinal direction is relaxed or the adjacent phase of the transverse stretching machine is gradually reduced to shrink the film. The uniformity of the direction of the slow phase axis is also important. The angle is preferably -5 to +5°, more preferably -1 to +Γ, relative to the width direction of the film, and particularly preferably -〇·5~ + 0.5° The range is particularly preferably in the range of -0.1 to +0.1°. These deviations can be achieved by optimizing the extension conditions. The optical film of the present invention preferably has a height of 300 nm or more from the apex of the adjacent mountain to the bottom of the valley, and a continuous stripe having a slope of 300 nm/mm or more in the longitudinal direction is preferable. The shape of the stripe was measured using a surface roughness meter. Specifically, a load of 0.75 mN was measured using a stylus (diamond needle) having a front end shape of a cone of 60° and a tip radius of curvature of 2 μm using a SV-3100S4 manufactured by Mitutoyo. The speed of 1.0 mm/sec was scanned in the width direction of the film, and the profile curve was measured as a Z-axis (thickness direction) decomposition energy of 0.001 μm. From this curve, the height of the stripe reads the vertical distance (Η) from the vertex of the mountain to the bottom point of the valley. The slope of the stripe is read from the horizontal distance (L) from the apex of the mountain to the bottom of the valley, and the vertical distance (Η) divided by the horizontal distance (L) and 201030080. <The amount of the solvent to be contained> The optical film of the present invention is produced by a melt-casting film forming method. Therefore, the amount of the solvent contained in the roll-form film is 0.01% by mass or less. The amount of solvent contained can be determined by the following method. Each sample was placed in a sealed glass vessel of 20 ml, and treated under the following top φ space heating conditions, and then subjected to the following gas chromatography to prepare a calibration curve for the solvent to be used in advance. The amount of solvent contained is expressed in parts by mass relative to the overall mass of the optical film.

機器二 HP 社 5890SERIES II 柱：J&W 社 DB-WAX(內徑 0.32mm、長度 30m)Machine 2 HP 5890SERIES II Column: J&W Society DB-WAX (inner diameter 0.32mm, length 30m)

檢出：FID GC升溫條件：以4(TC保持5分鐘後，以8(TC/分鐘升溫至1 0 0 °c φ 頂部空間加熱條件：120°c、20min <清掃設備> 本發明之製造裝置中’較佳爲附加自動清掃皮帶及輥的裝置。清掃裝置無特別限定，例如有夾持刷.輥、吸水輕、黏著輕、擦拭輥等的方式、吹送清淨空氣之吹拂方式、以雷射之燒毀裝置、或此等之組合。夾持清掃用輥的方式時’改變皮帶線速度與輥線速度時’清掃效果較大。 -39- 201030080 本發明之光學薄膜較佳爲長條薄膜，具體而言係表示 100m〜5000m者’通常以輥狀被提供的形態。此外，薄膜之寬度較佳爲1.3~4m，更佳爲1.4〜2m。本發明之光學薄膜之膜厚無特別限定，使用於後述之偏光板保護薄膜時，較佳爲 20~200μιη，更佳爲 25~100μιη，特佳爲 30~80μιη。Detection: FID GC temperature rising condition: 4 (TC held for 5 minutes, 8 (TC / min warming to 1000 ° c φ head space heating conditions: 120 ° c, 20 min < cleaning equipment > The present invention In the manufacturing apparatus, it is preferable to add a device for automatically cleaning the belt and the roller. The cleaning device is not particularly limited, and is, for example, a brush, a roller, a light-absorbent, a light-adhesive, a wiping roller, or the like, and a blowing method for blowing clean air. Laser burnt device, or a combination of the same. When the method of cleaning the roll is held, the 'cleaning effect is large when changing the belt line speed and the roll line speed. -39- 201030080 The optical film of the present invention is preferably a strip The film, specifically, a form of 100 m to 5000 m is usually provided in the form of a roll. Further, the width of the film is preferably 1.3 to 4 m, more preferably 1.4 to 2 m. The film thickness of the optical film of the present invention is not particularly large. When it is used for a polarizing plate protective film to be described later, it is preferably 20 to 200 μm, more preferably 25 to 100 μm, and particularly preferably 30 to 80 μm.

〔偏光板〕本發明之光學薄膜作爲偏光板用保護薄膜使用時，可以一般方法製作偏光板。本發明之光學薄膜的背面側設置黏著層，再貼合於浸漬於碘溶液中延伸製作之偏光子之至少一表面上較佳。[Polarizing Plate] When the optical film of the present invention is used as a protective film for a polarizing plate, a polarizing plate can be produced by a general method. It is preferable that the optical film of the present invention has an adhesive layer on the back side thereof and is attached to at least one surface of the polarizer which is formed by stretching in an iodine solution.

在另一面即使使用本發明之光學薄膜，也可使用另外的偏光板保護薄膜。例如較佳爲使用市售的纖維素酯薄膜 (例如 ’ Konica Minolta KC8UX ' KC4UX ' KC5UX ' KC8UY、KC4UY、KC12UR、KC8UCR-3、KC8UCR-4、 KC8UCR-5 、 KC8UE 、 KC4UE 、 KC4FR-3 、 KC4FR-4 、 KC4HR-1 ' KC8UY-HA、KC 8UX-RH A、以上爲 KonicaOn the other hand, even if the optical film of the present invention is used, an additional polarizing plate can be used to protect the film. For example, it is preferred to use a commercially available cellulose ester film (for example, 'Konica Minolta KC8UX ' KC4UX ' KC5UX ' KC8UY, KC4UY, KC12UR, KC8UCR-3, KC8UCR-4, KC8UCR-5, KC8UE, KC4UE, KC4FR-3, KC4FR -4, KC4HR-1 'KC8UY-HA, KC 8UX-RH A, the above is Konica

Minolta Opto(股）製）等。偏光板之主要構成要素的偏光子係指僅通過一定方向之偏波面之光的元件，現在已知之代表性偏光子係聚乙烯醇系偏光薄膜’此係將聚乙烯醇系薄膜以碘染色者與經二色性染料染色者。偏光子係使用將聚乙烯醇水溶液製膜’將此一軸延伸 -40- 201030080 後染色或染色後進行一軸延伸，較佳爲以硼化合物進行耐久性處理者。上述黏著層所使用的黏著劑係黏著層之至少一部分使用25°C下之貯存彈性模數爲1.0xlO4~1.0xl09Pa之範圍的黏著劑，也可使用塗佈黏著劑，貼合後藉由各種化學反應形成高分子量物或交聯構造之硬化型黏著劑。具體例如有胺基甲酸乙酯系黏著劑、環氧系黏著劑、 φ 水性高分子-異氰酸酯系黏著劑、熱硬化型丙烯酸黏著劑等之硬化型黏著劑、濕氣硬化胺基甲酸乙酯黏著劑、聚醚甲基丙烯酸酯型、酯系甲基丙烯酸酯型、氧化型聚醚甲基丙烯酸酯等之厭氣性黏著劑、氰基丙烯酸酯系之瞬間黏著劑、丙烯酸酯及過氧化物系之雙液型瞬間黏著劑等。上述黏著劑可爲一液型、或使用前混合2液以上再使用的型。又上述黏著劑可爲以有機溶劑爲介質的溶劑系、或水 φ 爲主成份之介質的乳液型、膠體分散液型、水溶液型等的水系、或無溶劑型。上述黏著劑液的濃度可由黏著後之膜厚、塗佈方法、塗佈條件等適當決定，一般爲0.1〜50質量％。 [液晶顯示裝置] 將貼合本發明之光學薄膜之偏光板組裝於液晶顯示裝置’可製作各種辨識性優異的液晶顯示裝置，特別是適用於大型液晶顯示裝置或數字標牌等屋外用途的液晶顯示 -41 - 201030080 器。本發明之偏光板係介於前述黏著層等貼合於液晶胞上。本發明之偏光板較佳爲用於反射型、透過型、半透過型LCD或TN型、STN型、〇CB型、HAN型、VA型 (PVA型、MVA型）、IPS型（包含FFS方式）等各種驅動方式的LCD。特別是畫面爲30吋以上’更佳爲30吋~54吋之大畫面的顯示裝置’在畫面周邊部無泛白等’可長時間Minolta Opto (share) system, etc. The polarizer of the main constituent elements of the polarizing plate refers to an element that passes only the light of the deflecting surface in a certain direction, and a representative polarizing film-based polyvinyl alcohol-based polarizing film is now known. Dyeing with dichroic dyes. The polarizer is formed by forming a film of a polyvinyl alcohol aqueous solution. The one-axis is extended from -40 to 201030080, and then dyed or dyed, and then subjected to one-axis stretching, and it is preferred to carry out durability treatment with a boron compound. At least a part of the adhesive-based adhesive layer used in the adhesive layer is an adhesive having a storage elastic modulus at 25 ° C of 1.0 x 10 4 to 1.0 x 109 Pa, or a coating adhesive may be used, and various types of adhesives may be used after bonding. The chemical reaction forms a hardening type adhesive having a high molecular weight or a crosslinked structure. Specific examples include a urethane-based adhesive, an epoxy-based adhesive, a φ aqueous polymer-isocyanate-based adhesive, a thermosetting acrylic adhesive, and the like, and a moisture-curing urethane adhesive. Anionic adhesive such as polyether methacrylate type, ester type methacrylate type, oxidized polyether methacrylate, cyanoacrylate type instant adhesive, acrylate and peroxide It is a two-liquid type instant adhesive. The above-mentioned adhesive may be a one-liquid type or a type in which two or more liquids are mixed before use. Further, the above-mentioned adhesive may be an aqueous solution of a solvent type containing an organic solvent or a medium containing water φ as a main component, a colloidal dispersion type, an aqueous solution type or the like, or a solventless type. The concentration of the above-mentioned adhesive liquid can be appropriately determined by the film thickness after adhesion, the coating method, the coating conditions, and the like, and is usually 0.1 to 50% by mass. [Liquid crystal display device] The liquid crystal display device can be fabricated by assembling a polarizing plate to which the optical film of the present invention is bonded to a liquid crystal display device. In particular, it can be applied to liquid crystal displays for outdoor use such as large liquid crystal display devices or digital signage. -41 - 201030080. The polarizing plate of the present invention is bonded to the liquid crystal cell by the adhesion layer or the like. The polarizing plate of the present invention is preferably used for reflective, transmissive, semi-transmissive LCD or TN type, STN type, 〇CB type, HAN type, VA type (PVA type, MVA type), IPS type (including FFS mode). ) LCDs of various driving methods. In particular, a display device having a screen size of 30 吋 or more and more preferably 30 吋 to 54 ’ is not whitened at the periphery of the screen.

維持其效果。 Q 此外，具有色斑、閃光或凹凸不勻較少’即使長時間觀賞眼睛也不疲勞的效果。【實施方式】實施例以下將舉實施例具體說明本發明’但本發明非限定於此等。 ❹ 實施例1 [丙烯酸樹脂之調製] 藉由公知的方法調製以下的丙烯酸樹脂A2-A7及 MSI、2。 A2 :單體質量比（MMA : MA = 97 : 3)、Mwl 20000 A3:單體質量比（MMA: MA = 97: 3)、Mwl40000 A4:單體質量比（MMA: MA = 97: 3)、Mw200000 A5:單體質量比（MMA: MA = 97: 3)、Mw500000 -42- 201030080 A6:單體質量比（MMA: MA = 97: 3)、Mw550000 A7:單體質量比（MMA: MA = 94: 6)、MwlOOOOOO MMA :甲基丙烯酸甲酯 ΜΑ :甲基丙烯酸酯其他使用以下市售的丙烯酸樹脂。將A1 acrypet V(三菱人造絲（股）製）MwlOOOOO A2 70質量份 '纖維素酯爲纖維素乙酸酯丙酸酯（乙 φ 醯基之取代度0.19、丙醯基之取代度2.56、總醯基取代度 2.75、Mw = 200000)30 質量份、Tinuvin92 8 (Ciba Japan (股）製）1.5質量份、ADK STAB PEP-36(旭電化工業（股）製）〇.〇1 質量份、Irganoxl010(ciba Japan (股）製）0.5 質量份、SumilizerGS(住友化學（股）製）0.2質量份的比例調配形成構成光學薄膜1的組成物1。將上述組成物分別使用真空諾塔混合機在 80°C、 1 Torr下混合3小時同時進一步乾燥。將乾燥後之組成物 φ 使用2軸式擠壓機，以235 °C熔融混合形成顆粒化。將上述顆粒使用各自之1軸擠壓機，使用由T模層合，在熔融溫度240°C下，熔融擠出成薄膜狀於表面溫度 90°C之第1冷卻輥上，藉由擠壓成形得到總膜厚1 50μχη之鑄膜。此時，在第1冷卻輥上’將薄膜以具有2mm厚之金屬表面的彈性接觸輥緊壓。接著，將此薄膜藉由利用輥周速差的拉伸機’在 1 5 5 °C (組成物之T g 1 2 5 °C )下’於搬送方向延伸1.3倍’再導入具有預熱區、延伸區、保持區、冷卻區（各區間也具 -43- 201030080 有確實將各區間隔熱用的中性區）之寬度方向之延伸機的拉幅器中，在寬度方向以155°C延伸1.3倍後，冷卻至 3 0°C後將夾具鬆開’裁斷夾具握持部得到寬2500mm、膜厚80μιη的光學薄膜1 上述光學薄膜1之製作中，除了將丙烯酸樹脂（Α)、纖維素酯樹脂（Β)之種類、分子量、組成比、可塑劑之有無、延伸條件、膜厚如表1變更外，同樣操作得到本發明及比較的光學薄膜2〜30。此等之溶劑含量均爲0.01質量％以下。可塑劑1 : DOΑ(二辛基己二酸酯） 201030080Maintain its effect. Q In addition, there are fewer spots, flashes, or unevenness of the bumper'. Even if you look at your eyes for a long time, you will not fatigue. [Embodiment] Hereinafter, the present invention will be specifically described by way of examples, but the present invention is not limited thereto.实施 Example 1 [Preparation of acrylic resin] The following acrylic resins A2-A7, MSI, and 2 were prepared by a known method. A2: monomer mass ratio (MMA: MA = 97: 3), Mwl 20000 A3: monomer mass ratio (MMA: MA = 97: 3), Mwl40000 A4: monomer mass ratio (MMA: MA = 97: 3) , Mw200000 A5: monomer mass ratio (MMA: MA = 97: 3), Mw500000 -42- 201030080 A6: monomer mass ratio (MMA: MA = 97: 3), Mw550000 A7: monomer mass ratio (MMA: MA = 94: 6), MwlOOOOOO MMA: Methyl methacrylate ΜΑ : Methacrylate Others The following commercially available acrylic resins were used. A1 acrypet V (manufactured by Mitsubishi Rayon Co., Ltd.) MwlOOOOOO A2 70 parts by mass of 'cellulose ester is cellulose acetate propionate (degree of substitution of ethyl φ fluorenyl group 0.19, degree of substitution of propyl fluorenyl group 2.56, total Sulfhydryl substitution degree 2.75, Mw = 200000) 30 parts by mass, Tinuvin 92 8 (manufactured by Ciba Japan Co., Ltd.) 1.5 parts by mass, ADK STAB PEP-36 (made by Asahi Kasei Co., Ltd.) 〇.〇1 parts by mass, Irganoxl010 (manufactured by Ciba Japan Co., Ltd.) 0.5 parts by mass of a Sumilizer GS (manufactured by Sumitomo Chemical Co., Ltd.) in a ratio of 0.2 parts by mass to form a composition 1 constituting the optical film 1. The above compositions were separately dried by using a vacuum Nota mixer at 80 ° C and 1 Torr for 3 hours. The dried composition φ was melt-mixed at 235 ° C to form pellets using a 2-axis extruder. The above pellets were laminated on a first cooling roll having a surface temperature of 90 ° C by laminating a T-die using a T-die and melt-extruding into a film at a melt temperature of 240 ° C. A cast film having a total film thickness of 150 μm was formed. At this time, the film was pressed on the first cooling roll by a spring contact roll having a metal surface of 2 mm thick. Next, the film was further introduced into the preheating zone by a stretching machine using a peripheral speed difference of the rolls at a temperature of 1 5 5 ° C (T g 1 2 5 ° C of the composition) to extend 1.3 times in the conveying direction. In the tenter of the extension machine of the width direction of the extension zone, the holding zone, and the cooling zone (the zone also has -43-201030080, which has a neutral zone for heat insulation of each zone), 155 ° C in the width direction After extending 1.3 times, after cooling to 30 ° C, the jig is released. 'The cutting jig grip portion is obtained. The optical film 1 having a width of 2500 mm and a film thickness of 80 μm is produced in the above optical film 1 except for the acrylic resin. The type, molecular weight, composition ratio of the ester resin, the presence or absence of the plasticizer, the extension conditions, and the film thickness were changed as shown in Table 1, and the optical films 2 to 30 of the present invention and comparatively obtained were obtained in the same manner. The solvent content of these is 0.01% by mass or less. Plasticizer 1: DOΑ(dioctyl adipate) 201030080

1 【§ tt m s S "Ί s § s 8 § S s g § § s s s s to g s 1 ol °°: 8 s s s u Φ g s o g § s »-H Π s § F-1 § s 1 s »-H M s o 〇〇 s »H s wi g s — S' r-J : s s s s tH s § s rH s rH 進盎樹· 卿 CO i—l X CO CO rH X CO rH s X CO i-H CO X _j X eo CO 1-H X X X CO r*4 <〇： rH ¢0 rH ' ~i 00 »H <〇 X X ¢0 fH S tH X €〇 tH K rH ! X X ¢0 »—I CO — 枳 m 辋 m !·υ 域 s in in rH s W s •H K K K? tn tn ffi in in *H in ΙΛ -ϋ s：掛· 闻φ cn •-η X CO •Ή CO •H X CO I X CO CO X X CO f-H CO X X X CO — CO iH CO »H CO r·^ X X CO rH K »-H X CO — rH X X oo rH CO »H rs m Sp »—4 S3 rH β 一 K — ffi »Ή S Ί s s B — ί8 ffi pH ID ΚΛ — ir> in 蘅劉 Φ _ X x X X X CQ CO CO CO CO X o Ϊ m x 0 1 m )51 X X X X X X j X ~·1 X X —H CO ~ w a k X CO m m £ X X X X g P m t? i m 寂 1? i t? — w m 链\ 璀< ·~«-χ 另 > 沄 \ o 另 \ o s \ o 另 \ o 另另 \ o 另 \ o 沄 \ o § \ O O 00 \ o § > 另 \ o 另 \ o s \ o 8 *-i in \ s 钨 \ S | s S \ S o \ 另 s \ § g \ 〇 ζ O 沄 \ O s \ o > S \ O 另 \ o w \ o SS m 1H Μ 提 I 1 o 8 〇 0 1 i 0 1 § i | o o 8 I 0 1 I e o 0 1 § 1 o 8 〇 i I s i g o | o 8 8 1 O 8 8 w 0 1 〇 8 8 M 0 1 M o s o E o § s I § I 1 0 1 卜 0 1 00 o o tr> e«a 〇« s c^i s s c4 s cq s c4 s 0¾ 沄 s <s is (O in s w s s i8 ca s s S N s csj s csi g o o 1 s ca ir> <〇 in 〇i m m5^ & Ln cs U) K oi ci K N in 〇j Λ c^i lf> ci in w lr <N) LO <N) l〇 N K s u> ci Lf3 N u> ci LO ei ui N u> cj lq N g rH o o S CSJ s N ci ci 婴 «ί< 1E X o o § 1 8 2 o o N I 1 f-^ I 8 3 i R I § 0 1 M o g 8 ir> I S 〇 1 s 1 o 0 1 o 0 1 o i O 8 8 2 1 2 I § f-4 I I 〇 § rH 8 o § o o § o 8 s o g s rH 8 o § I o § I CS| 〇 § s pH 顒 £ 5 S £ 滕趟 CM < w < <M < 00 < CO < 1— < 寸 < < l〇 < 1C < CO < < < *H < < 03 < w < CM < w < w < (M < ca < < <M < OJ < w < < N < N < CO < Hi «Η w CO !Λ CD 00 a o rH eg 2 21 LO CO 0〇 2 SJ 器 σ> CSJ § -45- 201030080 膜薄學光之得所估評述下以法方估評 (玻璃轉化溫度）延伸前之光學薄膜的Tg係大致與製作後之光學薄膜相同，因此藉由測定光學薄膜之Tg，代替延伸前之光學薄膜的Tg。 2 3°C、5 5%RH之氣氛下、玻璃轉化溫度係指使用差示掃描熱量測定器（Perkin Elmer公司製DSC-7型），以升溫速度20°C/分鐘測定後，依JIS K7 1 2 1 (1 987)求得之中間點玻璃轉化溫度（Tmg)(°C )。 (張力軟化點） 2 3°C、55%RH之氣氛下、使用萬能拉力測試機 (Tensilon)(ORIENTEC 公司製 RTC- 1 225A)進行下述評估。將光學薄膜切成120mm(長）xl0mm(寬）後，以10N的張力拉伸，同時以3 〇t/min之升溫速度繼續升溫’到達 9N時點的溫度（t )測定3次，求其平均値。 (耐折度）將光學薄膜切成120mm(長）xl〇mm(寬）後，在調成溫度2 3 °C、調濕成相對濕度5 5 %RH的室內，經4小時調濕後，依據IS0877 6/2-1988，求出藉由折彎直到切斷爲止之往復次數。 -46 - 201030080 [表2] 光學薄膜 No. Tg /•C 張力軟化點 /.C 耐折度 /次備註 1 125 121 80 本發明 2 125 121 70 本發明 3 125 121 50 本發明 4 125 122 70 本發明 5 125 122 50 本發明 6 122 123 80 本發明 7 122 123 70 本發明 8 122 123 50 本發明 9 122 123 70 本發明 10 122 123 50 本發明 11 125 123 50 本發明 12 115 100 70 比較例 13 125 114 10 比較例 14 115 100 70 比較例 15 125 114 10 比較例 16 113 103 0 比較例 17 120 105 55 本發明 18 127 123 70 本發明 19 128 126 70 本發明 20 130 131 80 本發明 21 125 135 80 本發明 22 133 145 100 比較例 23 128 125 30 比較例 24 120 115 70 本發明 25 125 121 20 比較例 26 120 115 55 本發明 27 145 110 10 比較例 28 120 117 20 比較例 29 120 118 50 本發明 30 125 121 90 本發明1 [§ tt ms S "Ί s § s 8 § S sg § § ssss to gs 1 ol °°: 8 sssu Φ gsog § s »-H Π s § F-1 § s 1 s »-HM so 〇〇s »H s wi gs — S' rJ : ssss tH s § s rH s rH into the tree · qing CO i—l X CO CO rH X CO rH s X CO iH CO X _j X eo CO 1-HXXX CO r*4 <〇: rH ¢0 rH ' ~i 00 »H <〇XX ¢0 fH S tH X €〇tH K rH ! XX ¢0 »—I CO — 枳m 辋m !·υ Domain s In in rH s W s •HKKK? tn tn ffi in in *H in ΙΛ -ϋ s: hang· smell φ cn •-η X CO •Ή CO •HX CO IX CO CO XX CO fH CO XXX CO — CO iH CO »H CO r·^ XX CO rH K »-HX CO — rH XX oo rH CO »H rs m Sp »—4 S3 rH β·K — ffi »Ή S Ί ss B — ί8 ffi pH ID ΚΛ — ir&gt ; in 蘅刘Φ _ X x XXX CQ CO CO CO CO X o Ϊ mx 0 1 m )51 XXXXXX j X ~·1 XX —H CO ~ wak X CO mm £ XXXX g P mt? im 寂 1? it? — wm chain \ 璀< ·~«-χ another> 沄\ o another \ os \ o another \ o another \ o another \ o 沄 \ o § \ OO 00 \ o § &gt ; another \ o another \ os \ o 8 *-i in \ s tungsten \ S | s S \ S o \ another s \ § g \ 〇ζ O 沄 \ O s \ o > S \ O another \ ow \ o SS m 1H Μ I 1 o 8 〇0 1 i 0 1 § i | oo 8 I 0 1 I eo 0 1 § 1 o 8 〇i I sigo | o 8 8 1 O 8 8 w 0 1 〇8 8 M 0 1 M oso E o § s I § I 1 0 1 卜 0 1 00 oo tr> e«a 〇« sc^iss c4 s cq s c4 s 03⁄4 沄s <s is (O in swss i8 ca ss SN s csj s csi goo 1 s ca ir><〇in 〇im m5^ & Ln cs U) K oi ci KN in 〇j Λ c^i lf> ci in w lr <N) LO <N l〇NK s u> ci Lf3 N u> ci LO ei ui N u> cj lq N g rH oo S CSJ s N ci ci infant «ί< 1E X oo § 1 8 2 oo NI 1 f-^ I 8 3 i RI § 0 1 M og 8 ir> IS 〇1 s 1 o 0 1 o 0 1 oi O 8 8 2 1 2 I § f-4 II 〇§ rH 8 o § oo § o 8 sogs rH 8 o § I o § I CS| 〇§ s pH 5 £ 5 S £ 趟 CM < w << M < 00 < CO < 1 - < inch <<l〇< 1C < CO <<< *H << 03 < w < CM < w < w < (M < ca <<<< M < OJ < w << N < N < CO < Hi «Η w CO !Λ CD 00 ao rH eg 2 21 LO CO 0〇2 SJ σ> CSJ § -45- 201030080 The evaluation of the thin film of light is evaluated by the French side (glass transition temperature). The Tg of the optical film before stretching is almost the same as that of the optical film after the fabrication, so the Tg of the optical film is measured instead. The Tg of the optical film before stretching. 2 3 ° C, 5 5% RH atmosphere, glass transition temperature refers to the use of differential scanning calorimeter (Perkin Elmer company DSC-7 type), measured at a temperature increase rate of 20 ° C / min, according to JIS K7 1 2 1 (1 987) Find the intermediate point glass transition temperature (Tmg) (°C). (Tensile softening point) The following evaluation was carried out under an atmosphere of 3 ° C and 55% RH using a Tencelon tester (RTC-1 225A, manufactured by ORIENTEC Co., Ltd.). After the optical film was cut into 120 mm (length) x 10 mm (width), the film was stretched at a tension of 10 N while the temperature was raised at a temperature increase rate of 3 〇t/min. The temperature (t) at the point of reaching 9 N was measured three times, and the average was obtained. value. (Folding resistance) After the optical film was cut into 120 mm (length) x l 〇 mm (width), it was adjusted to a temperature of 23 ° C, and the humidity was adjusted to a relative humidity of 5 5 % RH. After 4 hours of conditioning, According to IS0877 6/2-1988, the number of reciprocations by bending until cutting is determined. -46 - 201030080 [Table 2] Optical film No. Tg /•C Tensile softening point /.C Folding resistance / Sub-remark 1 125 121 80 The present invention 2 125 121 70 The present invention 3 125 121 50 The present invention 4 125 122 70 The present invention 5 125 122 50 The invention 6 122 123 80 The invention 7 122 123 70 The invention 8 122 123 50 The invention 9 122 123 70 The invention 10 122 123 50 The invention 11 125 123 50 The invention 12 115 100 70 Comparative example 13 125 114 10 Comparative Example 14 115 100 70 Comparative Example 15 125 114 10 Comparative Example 16 113 103 0 Comparative Example 17 120 105 55 The present invention 18 127 123 70 The present invention 19 128 126 70 The present invention 20 130 131 80 The present invention 21 125 135 80 invention 22 133 145 100 comparative example 23 128 125 30 comparative example 24 120 115 70 invention 25 125 121 20 comparative example 26 120 115 55 invention 27 145 110 10 comparative example 28 120 117 20 comparative example 29 120 118 50 The invention 30 125 121 90 the invention

<偏光板及液晶顯示裝置之製作> (偏光板之製作）如下述製作以各光學薄膜作爲偏光板保護薄膜的偏光板。 '. 將厚度120μιη之長捲筒聚乙烯醇薄膜浸漬於含有碘1 質量份、硼酸4質量份之水溶液100質量份中，在50 °C以 5倍在搬送方向進行延伸製作偏光子。 -47- 201030080 其次，於此偏光子之單面使用丙烯酸接著劑，對實施例1所製作之光學薄膜1施予電暈處理後，進行貼合。再於偏光子之另一面貼合進行鹼皂化處理後之相位差薄膜的 Konica Minolta tac K C 8 U C R - 5 (Kon i ca Minolta Opto(股）製），進行乾燥製作偏光板PI。以同樣方式使用光學薄膜2~30製作偏光板P2~P30。 (再加工性） 23°C、55%RH之氣氛下 '將製作之偏光板裁切成 20cmX 20cm之大小的正方形，使用丙烯酸系接著劑，與玻璃基板貼合。接著，將貼合後之偏光板由角的部分，以 5N的強度自玻璃上剝離。對於1種類試料，以100片的偏光板進行此作業，計算偏光板有裂縫，無法完全剝離之偏光板的片數。再加工性係以下述基準，設置等級。〇：〇~5片〇 △ : 6 ~ 1 0 片 △ : 1 1~15 片 X : 1 6片以上再加工性爲△水準以上時，實用上無問題，但是〇△ 水準以上較佳，〇水準特佳。〔液晶顯示裝置之製作〕使用上述製作之各偏光板，評估光學薄膜之顯示特性。將Sharp(股）製32吋電視AQ-32AD5之預先貼合之兩 201030080 面的偏光板予以剝離後’使Konica Minolta tac KC8UCR-5成爲液晶胞之玻璃面側，且使吸收軸朝向與預先貼合之偏光板相同的方向的狀態，分別貼合上述製作的偏光板，製作各液晶顯示裝置。然後，在23°C、55%RH之環境下’ 12小時連續點亮背光，在暗室中以目視觀察全面黑顯示狀態，評估漏光。結果如表3所示。 (漏光）以目視藉由下述基準評估黑顯示時之漏光。〇：完全無漏光： X :強的漏光有1~2處<Production of Polarizing Plate and Liquid Crystal Display Device> (Production of Polarizing Plate) A polarizing plate in which each optical film is used as a polarizing plate protective film is produced as follows. A long-rolled polyvinyl alcohol film having a thickness of 120 μm was immersed in 100 parts by mass of an aqueous solution containing 1 part by mass of iodine and 4 parts by mass of boric acid, and was extended at 50 ° C in a direction of 5 times to produce a polarizer. -47-201030080 Next, the optical film 1 produced in Example 1 was subjected to corona treatment using an acrylic adhesive on one side of the polarizer, and then bonded. Konica Minolta tac K C 8 U C R - 5 (manufactured by Kon i ca Minolta Opto Co., Ltd.) which was subjected to alkali saponification treatment on the other side of the polarizer, and dried to prepare a polarizing plate PI. The polarizing plates P2 to P30 were produced in the same manner using the optical films 2 to 30. (Reworkability) Under the atmosphere of 23 ° C and 55% RH, the polarizing plate produced was cut into a square having a size of 20 cm × 20 cm, and bonded to a glass substrate using an acrylic adhesive. Next, the laminated polarizing plate was peeled off from the glass by the strength of 5 N from the corner portion. For one type of sample, this operation was performed with 100 sheets of polarizing plates, and the number of polarizing plates in which the polarizing plates were cracked and could not be completely peeled off was calculated. The reworkability is set based on the following criteria. 〇: 〇~5 pieces 〇 △ : 6 ~ 1 0 pieces △ : 1 1~15 pieces X : 1 6 pieces or more When the reworkability is above △ level, there is no problem in practical use, but 〇 △ level is better than above, 〇 Very good standard. [Production of Liquid Crystal Display Device] The display characteristics of the optical film were evaluated using the polarizing plates prepared above. After peeling off the two polarized plates of the 201030080 surface of the 32-inch TV AQ-32AD5 made by Sharp, the Konica Minolta tac KC8UCR-5 becomes the glass side of the liquid crystal cell, and the absorption axis is oriented in advance. In the same direction as the polarizing plates, the polarizing plates produced above were bonded to each other to produce liquid crystal display devices. Then, the backlight was continuously lit for 12 hours in an environment of 23 ° C and 55% RH, and the total black display state was visually observed in a dark room to evaluate light leakage. The results are shown in Table 3. (Light leakage) The light leakage at the time of black display was evaluated by visual observation by the following criteria. 〇: No light leakage at all: X: Strong light leakage has 1~2 places

-49 - 201030080 [表3] 光學薄膜 No. 再加工性漏光備註 1 〇〇本發明 2 〇△ 〇本發明 3 〇△ 〇本發明 4 〇△ 〇本發明 5 Δ 〇本發明 6 〇〇本翻 7 〇△ 〇本發明 8 〇△ 〇本發明 9 〇△ 〇本發明 10 △ 〇本發明 11 Δ 〇本發明 12 〇△ X 比較例 13 X 〇比較例 14 〇△ X 比較例 15 X 〇比較例 16 X X 比較例 17 △ 〇本發明 18 〇〇本發明 19 〇〇本發明 20 〇〇本發明 21 〇〇本發明 22 〇 X 比較例 23 X 〇比較例 24 〇△ 〇本發明 25 X 〇比較例 26 Δ 〇本發明 27 X X 比較例 28 X 〇比較例 29 △ 〇本發明 30 〇〇本發明本發明之光學薄膜係再加工性佳，不易產生漏光’很明顯相較於比較例有改善。實施例2 <丙烯酸粒子（C1)之調製> 將離子交換水38.2L、二辛基磺基琥珀酸鈉111.6g投入內容積60L之附回流冷卻器的反應器中，以250rpm的 -50- 201030080 轉數攪拌，同時氮氣氛下升溫至75 °C形成事實上無氧影響的狀態。投入APS 0.3 6g攪拌5分鐘後，再一次添加由 MMA 1 657g、BA 21.6g及ALMA 1.68g所構成的單體混合物，檢測出發熱峰後，再保持20分鐘，完成最內硬質層之聚合。其次投入APS 3.4 8g，攪拌5分鐘後以120分鐘連續添力卩由 B A 8105g ' PEGDA(200)31.9g 及 ALMA 264.0g 所 φ 構成的單體混合物，添加結束後再保持120分鐘完成軟質層之聚合。接著投入APS 1.32g，攪拌5分鐘後以20分鐘連續添加由MMA 2106g、BA 201.6g所構成的單體混合物，添加結束後再保持20分鐘完成最外硬質層1之聚合。接著投入APS 1 .3 2g，5分鐘後以20分鐘連續添加由 MMA 3148g、BA 201.6g 及 n-OM lO.lg 所構成的單體混合物，添加結束後再保持20分鐘。升溫至95 T：後保持60 φ 分鐘，完成最外硬質層2之聚合。此採取少量上述所得之聚合物乳膠，藉由吸光度法得到平均粒徑0. 1 Ομηι。將剩餘之乳膠投入3質量％硫酸鈉溫水溶液中，進行鹽析、凝固後接著重複脫水、洗淨後再乾燥’得到3層構造之丙烯酸基粒子（C η。上述簡略符號係各自爲下述材料。 ΜΜΑ :甲基丙烯酸甲酯 ΜΑ :甲基丙烯酸酯 BA : η-丁基丙烯酸酯 -51 - 201030080 ALMA:烯丙基甲基丙烯酸酯 PEGDA ··聚乙二醇二丙稀酸酯（分子量2〇〇) n-OM : η-辛基硫醇 A P S :過硫酸錢以下除了將丙烯酸樹脂（A)、纖維素酯樹脂（b)、丙烯酸粒子（C )、組成比如表4所記載改變外，與實施例1所記載之光學薄膜2的製造方法同樣操作，製作光學薄膜 2-1與2-2，再與光學薄膜1之製造方法同樣操作製作光 ❹ 學薄膜1-1〜1-6。含有丙烯酸樹脂之薄膜2-3係將下述紫外線吸收劑與其他樹脂同時添加，與2-2同樣製作。-49 - 201030080 [Table 3] Optical film No. Reworked light leakage Remark 1 〇〇 The present invention 2 〇 △ 〇 The present invention 3 〇 △ 〇 The present invention 4 〇 △ 〇 The present invention 5 Δ 〇 The present invention 6 〇〇本7 〇 △ 〇〇发明〇〇〇〇〇〇〇〇〇〇〇〇〇〇发明发明发明发明发明发明发明发明发明发明发明发明发明 X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X 16 XX Comparative Example 17 △ 〇 Present Invention 18 〇〇 Present Invention 19 〇〇 Present Invention 20 〇〇 Present Invention 21 〇〇 Present Invention 22 〇 X Comparative Example 23 X 〇 Comparative Example 24 〇 △ 〇 The present invention 25 X 〇 Comparative Example 26 Δ 〇 The present invention 27 XX Comparative Example 28 X 〇 Comparative Example 29 △ 〇 The present invention 30 〇〇 The optical film of the present invention is excellent in reworkability and is less likely to cause light leakage, which is obviously improved compared to the comparative example. Example 2 <Preparation of Acrylic Particles (C1)> 118.2 g of ion-exchanged water and 111.6 g of sodium dioctylsulfosuccinate were placed in a reactor equipped with a reflux condenser at an internal volume of 60 L, at a temperature of 250 rpm - 50 - 201030080 The number of revolutions is stirred and the temperature is raised to 75 °C in a nitrogen atmosphere to form a state of virtually no oxygen. After stirring 6 minutes of APS 0.3 6 g, a monomer mixture composed of MMA 1 657 g, BA 21.6 g and ALMA 1.68 g was further added, and after the starting heat peak was detected, the polymerization was continued for 20 minutes to complete the polymerization of the innermost hard layer. Next, APS 3.4 8g was charged, and after stirring for 5 minutes, the monomer mixture composed of BA 8105g 'PEGDA (200) 31.9 g and ALMA 264.0 g φ was continuously added for 120 minutes. After the addition, the soft layer was completed for 120 minutes. polymerization. Then, 1.32 g of APS was charged, and after stirring for 5 minutes, a monomer mixture composed of MMA 2106 g and BA 201.6 g was continuously added over 20 minutes, and after completion of the addition, the polymerization of the outermost hard layer 1 was completed for 20 minutes. Then, APS 1.3g was charged, and after 5 minutes, a monomer mixture composed of MMA 3148g, BA 201.6g, and n-OM 10g.g was continuously added for 20 minutes, and the addition was continued for 20 minutes. The temperature was raised to 95 T: after 60 φ minutes, the polymerization of the outermost hard layer 2 was completed. 1 Ομηι。 By taking a small amount of the above obtained polymer latex, by the absorbance method to obtain an average particle diameter of 0.1 Ομηι. The remaining latex was poured into a 3 mass% sodium sulfate warm aqueous solution to carry out salting out and solidification, followed by repeated dehydration, washing, and then drying to obtain a three-layer structure of acrylic-based particles (C η. The above abbreviated symbols are each described below. Material: Methyl methacrylate ΜΑ : Methacrylate BA : η-butyl acrylate -51 - 201030080 ALMA: Allyl methacrylate PEGDA · Polyethylene glycol diacrylate (molecular weight 2〇〇) n-OM : η-octyl mercaptan APS: Persulfate money, except that the acrylic resin (A), the cellulose ester resin (b), the acrylic particles (C), and the composition are as described in Table 4 The optical films 2-1 and 2-2 were produced in the same manner as in the method for producing the optical film 2 described in the first embodiment, and the optical film 1-1 to 1-6 was produced in the same manner as in the method of producing the optical film 1. The film 2-3 containing an acrylic resin was prepared by adding the following ultraviolet absorber together with other resins, and the same procedure as in 2-2.

Tinuviη 1 09(Ciba Japan (股）製） 1.5 質量份Tinuviη 1 09 (manufactured by Ciba Japan Co., Ltd.) 1.5 parts by mass

Tinuvinl71(Ciba Japan (股）製） 0.7 質量份此等光學薄膜之溶劑含量均爲0.01質量％以下。 ❿ -52- 201030080 備註 1本發MJ s m 锊丨本發明1 1本發明1 丨本發明1 ί本發明1 丨本發明1 s m 捋丨本發明1 1本發明1 1本發明1 膜厚u») 延伸後 § s § § 5 § g 延伸前 § S s pH s — ο o ο s § 延伸條件寬度方向 II CO rH X X CO CO 1—< CQ rH 00 •Η CO CO rH X X 延伸溫度 •C in in ΙΛ in rH u> in in P*4 tn 2 in tn in in •-H 長度方向 $1 cn X X cn rH CO CO r-i CO rH CO rH PO rH X X 延伸溫度 •C to lo LC LO »-H LO in in in rH in in s in in rH 可塑劑 _ 1 m 卿 X X X X X X X X X X X 組成比 (A/B/C) 質量份 70/30/- 70/30/- 66.5/28.5/5 69/30/1 64/35/1 59/40/1 69/30/1 64/35/1 59/40/1 69/30/1 69/30/1 粒子之構造 1 1 3層芯殻 3層芯殻 3層芯殼 3層芯殼 3層芯殻 3層芯殻 3層芯殼 3層芯殻 3層芯殼丙烯酸粒子 (C) 1 1 ▼Η u T"H o iH o f—t u u o rH o ϋ fH υ 光學薄膜 No. i w 1 CO 1 03 1 00 1 rH 寸 1 in 1 <〇 1 i-H (Μ 1 Μ CO t wTinuvinl 71 (manufactured by Ciba Japan Co., Ltd.) 0.7 parts by mass The solvent content of these optical films is 0.01% by mass or less. ❿ -52- 201030080 Remark 1 The present invention MJ sm 锊丨 The present invention 1 1 The present invention 1 丨 The present invention 1 本 The present invention 1 丨 The present invention 1 sm 捋丨 The present invention 1 1 The present invention 1 1 The present invention 1 Film thickness u» After extension § s § § 5 § g Before extension § S s pH s — ο o ο § § Extension condition width direction II CO rH XX CO CO 1—< CQ rH 00 •Η CO CO rH XX Extension temperature•C In in ΙΛ in rH u> in in P*4 tn 2 in tn in in •-H length direction $1 cn XX cn rH CO CO ri CO rH CO rH PO rH XX extension temperature • C to lo LC LO »-H LO In in r r in in s in in rH plasticizer _ 1 m qing XXXXXXXXXXX composition ratio (A/B/C) parts by mass 70/30/- 70/30/- 66.5/28.5/5 69/30/1 64/ 35/1 59/40/1 69/30/1 64/35/1 59/40/1 69/30/1 69/30/1 Construction of particles 1 1 3-layer core shell 3-layer core shell 3-layer core shell 3-layer core shell 3-layer core shell 3-layer core shell 3-layer core shell 3-layer core shell 3-layer core shell acrylic particles (C) 1 1 ▼Η u T"H o iH of-tuuo rH o ϋ fH υ Optical film No Iw 1 CO 1 03 1 00 1 rH inch 1 in 1 <〇1 iH (Μ 1 Μ CO tw

-53- 201030080 對於此等試料，進行與實施例1同樣的評估。結果如表5所示。 [表5] 光學薄膜 No. Tg /.c 張力軟化點 /.C 耐折度 /次再加工性漏光備註 1 125 121 80 〇〇本發明 2 125 121 70 〇△ 〇本發明 2-1 125 120 80 〇〇本發明 1-1 125 121 85 〇〇本發明 1-2 127 123 90 〇〇本發明 1-3 128 126 90 〇〇本發明 1-4 125 121 60 〇〇本發明 1-5 127 123 60 〇〇本發明 1-6 128 126 65 〇〇本發明 2-2 122 121 75 〇〇本發明 2-3 122 121 75 〇〇本發明如上述，本發明之光學薄膜中再添加丙烯酸微粒子時，可進一步改善耐折度及再加工性。【圖式簡單說明】 [圖1]係表示實施本發明之光學薄膜之製造方法之裝置之一之實施形態的槪略流程圖。【主要元件符號說明】 1 :擠壓機 2 :過濾器 3 :靜態混合機 4 :流延模 5:旋轉支持體（第1冷卻輥） 6:夾壓旋轉體（接觸輥） -54- 201030080 7 :旋轉支持體（第2冷卻輥） 8:旋轉支持體（第3冷卻輥） 9、 10、 11、 13、 14:搬運輥 1 2 :延伸機 1 5 :切割機 16 :捲取裝置 F:本發明之光學薄膜-53- 201030080 The same evaluation as in Example 1 was carried out for these samples. The results are shown in Table 5. [Table 5] Optical film No. Tg /.c Tensile softening point /. C Folding resistance / Secondary reworkability Light leakage Remarks 1 125 121 80 〇〇 The present invention 2 125 121 70 〇 △ 〇 The present invention 2-1 125 120 80 〇〇 invention 1-1 125 121 85 〇〇 invention 1-2 127 123 90 〇〇 invention 1-3 128 126 90 〇〇 invention 1-4 125 121 60 〇〇 invention 1-5 127 123 60 〇〇 The present invention 1-6 128 126 65 〇〇 The present invention 2-2 122 121 75 〇〇 2-3 122 121 75 〇〇 The present invention, as described above, when the acrylic film of the present invention is further added with acrylic fine particles, The folding resistance and reworkability can be further improved. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic flow chart showing an embodiment of an apparatus for carrying out the method for producing an optical film of the present invention. [Explanation of main component symbols] 1 : Extruder 2 : Filter 3 : Static mixer 4 : Casting die 5 : Rotating support (1st cooling roll) 6 : Clamping rotating body (contact roller) -54- 201030080 7 : Rotating support (second cooling roll) 8 : Rotating support (third cooling roll) 9, 10, 11, 13, 14: conveying roller 1 2 : stretching machine 1 5 : cutting machine 16: winding device F : Optical film of the invention

-55--55-

Claims

201030080 VII. Application for patents 1. An optical film characterized in that the acrylic resin (A) and the cellulose ester resin (B) have a mass ratio of 95:5 to 30:70, and the weight of the aforementioned acrylic resin (A) The average molecular weight Mw is 1 10,000 or more and 1,000,000 or less, the total thiol group (T) of the cellulose ester resin (B) is 2.0 or more and 3.0 or less, and the degree of substitution of the fluorenyl group having 3 or more and 7 or less carbon atoms is 1.2 or more and 3.0 or less, the cellulose ester resin (B) has a weight average molecular weight Mw of 75,000 or more and 300,000 or less, a tensile softening point of 105 to 145 ° C, a folding endurance of 50 to 100 times, and melt casting. Manufacturer of film making methods. 2. A method of producing an optical film, characterized in that the optical film of claim 1 is produced by extending in at least one of a transport direction and a width direction, and the extension temperature is an optical film before extension. Tg~Tg + 50 °C. 3. A polarizing plate characterized by having an optical film of the first application of the patent scope. A liquid crystal display device characterized by having a polarizing plate of claim 3 of the patent application.