201219817 六、發明說明： 【發明所屬之技術領域】 本發明係關於一種保護片及偏光板。 【先前技術】 近年來，液晶顯示裝置由於薄、輕且消耗電力小，因 此被廣泛使用代替CRT。具體而言，從計算機、時鐘等小 型物品，至汽車用測量儀器、PC螢幕及電視等大型物品， 皆廣泛使用液晶顯示裝置。 被裝入液晶顯示裝置之液晶顯示元件’係具有液晶胞 (liquid crystal cell )、與配置於液晶胞兩面之一對的偏光 板。此偏光板包含有片狀之偏光元件、與配置於此偏光元 件兩面之一對的保護片。保護片係用以保護偏光元件之結 構的薄片，一般而言，係由雙折射率小、透明性優異之三 乙醯基纖維素（triacetylcellulose )(以下，記載為「TAC」。） 形成。 然而’此TAC的耐濕熱性並不夠充分，若於高溫或高 濕下使用以TAC作為偏光元件保護膜之偏光板，則會有偏 光度及色調等之偏光板性能下降的缺點。i Μ對於斜方 向之入射光會產生相位差。近年來隨著液晶顯示器大型化 不斷發展’該相位差已顯荃祕糾 頟者地對視角特性造成影響》 因此’係研究使用耐埶性 生丙烯酸系樹脂來代替TAC。 具體而δ，係研究具有 聚合物之基質相、與含…“ _夂糸树月曰作為主 相的海島結構保護片（例 ‘"、聚。物之为散 例如，參照日本特開2〇10— 70646 201219817 號公報）。 然而，上述日本特開201 〇 — 70646號公報之保護片中， 上述分散相之丙烯酸系橡膠之平均粒徑為相對較大的〇 〇5 〜〇‘35 // m，因此會有無法充分確保保護片之透明性的 題。 專利文獻1 :日本特開2010- 70646號公報 【發明内容】 本發明係有鑑於此等不良情形而完成者，本發明之課 題在於提供一種富有耐熱性與可撓性且透明性高之保護 片’及一種具有該保護片的偏光板。 用以解決上述課題而完成之發明為： 一種保護片，係具有含耐熱性丙烯酸系樹脂作為主聚 合物之基質相、與含丙烯酸系橡膠作為主聚合物之分散相 的海島結構保護片； 該基質相與分散相之折射率差為〇 〇1以下； 該分散相之平均粒徑為lnm以上未達5〇nm。 該保護片中，基質相含有耐熱性丙烯酸系樹脂作為主 聚合物，分散相含有丙烯酸系橡膠作為主聚合物，因此， 不但富有耐熱性及可撓性，且基質相與分散相之折射率差 為〇.〇1以下，此外，由於分散相之平均粒徑為inm以上未 達50nm，故透明性高。尤其，由於分散層之平均粒徑未達 5〇nrn，因此可獲得極高的透明性。也就是說，理論上小於 可見光波長之一半的粒子雖不會對透明性造成不良影響， 但實際上卻會因為短波長側之可見光的影響而呈白濁然 4 201219817 而，只要如上述般未達5〇nm，即不會受到上述短波長側之 可見光的影響’而獲得極高的透明性。 又，該保護片中，分散相之含量較佳為5質量％以上 40質量％以下。由於在上述下限值以上，故可充分發揮必 需的可撓性，X由於在上述上限值以下，故可充分發揮必 需的透明性。 並且，於該保護片中，較佳為平面方向之延遲值為〇nm 以上15nm以下，厚度方向之延遲值為—15nm以上〇nm以 下。藉此，於穿透該保護片之透射光不易產生相位差因 此’即使使用作為例如偏光板等具有偏光功能之薄片的保 護片’亦具有不會阻礙此偏光功能的優點。 又，該保護片中，耐熱性丙烯酸系樹脂之總透光率較 佳為90%以上，藉此，可獲得充分之透明性。又，維卡軟 化點（Vicat softening point)較佳為 1〇5t 以上 i4(rc 以下。 藉由在上述下值以上，在使用料例㈣光板之保護片 時，可發揮充分之而t熱性’且藉由在上述上限值以下，則 在製作保護片時有易於溶融耐熱性丙烯酸系樹脂、易於製 造之優點。 上述耐熱性丙烯酸系樹脂較佳為在主鏈具有環結構。 藉此可使該保護片具有耐熱性更高之效果。 又，該保護片中，較佳為對單面或兩面實施有消光 (mat)加工。藉此，會具有「易於藉接著劑等將經實施過 該消光加工之面貼附於其他構件」的優點。例如，可使用 水系接著劑將經實施過該消光加工之面接著於偏光元件， 201219817 藉此使該保護片牢固地接著於偏光元件而形成偏光板。 又，該保護片中，較佳為具備有積層於單面之硬塗層， 藉由該硬塗層，可提高耐擦傷性。又，該硬塗層較佳為藉 由塗佈丙烯酸系塗料而形成，藉此，可確保薄片的透明性。 另，該發明亦包含具備片狀偏光元件、與藉接著劑層 積層於此偏光元件兩面之一對該保護片的偏光板。 如上所述，本發明之保護片富有耐熱性及可撓性，並 具有透明性高的效果》 【實施方式】 以下，一邊參照適當圖式，一邊說明本發明之實施形 態的保護片。 本實施形態之保護片，具有含耐熱性丙烯酸系樹脂作 為主聚合物之基質相、與含丙烯酸系橡膠作為主聚合物之 分散相。該保護片中，上述分散相分散於上述基質相中而 形成海島結構。以下對各相進行説明。 <基質相> 上述基質相含有作為主聚合物之耐熱性丙烯酸系樹 脂。此耐熱性丙烯酸系樹脂，意指含有丙烯酸、曱基丙烯 酸及此等之衍生物等丙烯酸系單體作為單體成分的聚合 物。此耐熱性丙烯酸系樹脂，例如可列舉將選自甲基丙稀 酸環己I旨、曱基丙稀酸三級丁環己酯、曱基丙烯酸曱酯等 曱基丙烯酸烷酯；丙烯酸曱酯、丙烯酸乙酯、丙烯酸丁酯、 丙烯酸異丙酯、丙烯酸2 —乙基己酯等丙烯酸烷酯之丨種或 複數種丙稀酸系單體加以聚合而成者。此耐熱性丙稀酸系 6 201219817 樹脂亦包含將丙烯酸系單體與其他單體成分加以共聚而成 者。於此種共聚之情形時，其他單體成分之含有率（共聚 比例）相對於構成耐熱性丙烯酸系樹脂之總單體成分較佳 在60質量％以下，更佳在5〇質量％以下，再更佳在4〇質 量％以下。 上述耐熱性丙烯酸系樹脂，較佳為含有甲基丙烯酸甲 醋作為單體成分之聚合物。藉由使耐熱性丙烯酸系樹脂含 有甲基丙烯酸甲酯作為單體成分，可提升所得之耐熱性丙 烯酸系樹脂之相溶性。含有甲基丙烯酸甲酯作為單體成分 之聚合物’可列舉甲基丙稀酸甲酯之均聚物、甲基丙烯酸 甲醋與其他單體之共聚物等。可與曱基丙烯酸曱酯共聚之 其他單體’例如可列舉甲基丙烯酸甲酯以外之甲基丙烯酸 烷酯類；丙烯酸烷酯類；α _羥曱基丙烯酸烷酯類；苯乙 烯、鄰甲基苯乙烯、對甲基苯乙烯、2,4_二甲基苯乙烯、 乙基苯乙烯、對三級丁基苯乙烯等經烷基取代之笨乙烯， α —曱基苯乙烯、α-曱基一對曱基苯乙烯等經α_烷基 取代之笨乙烯等的芳香族乙烯化合物類；丙烯腈、甲基丙 烯腈等不飽和腈類；Ν—苯基順丁烯二醯亞胺、ν—環己基 馬來醯亞胺（N—cyclohexylmaleimide)等順丁烯二醯亞胺 類，順丁烯二酸酐等不飽和羧酸酐類；丙烯酸、甲基丙烯 酸、順丁烯二酸等不飽和羧酸類等。此等其他之單體，從 提升所得之保護片的可撓性及耐熱性的觀點而言，較佳為 α—羥甲基丙烯酸烷酯類、苯乙烯、經烷基取代之苯乙稀、 經α —烧基取代之苯乙稀、不飽和缓酸類，更佳為〇 —經 201219817 曱基丙烯酸烷酯類、苯乙烯、經α_烷基取代之苯乙烯、 不飽和羧酸類，其中’再更佳為α _羥曱基丙烯酸曱酯、 苯乙烯、α —甲基苯乙烯、曱基丙烯酸。使用羥甲基 丙烯酸烷酯類作為其他單體而與曱基丙烯酸曱酯共聚時， 進一步藉由進行脫水反應，由於會形成含有部分聚合物主 鍵之内酯環’故會特別使所得之耐熱性丙烯酸系樹脂的耐 熱性獲得提升。此等之單體可單獨使用1種或組合複數種 使用。於此種甲基丙烯酸甲酯與其他單體之共聚物中，其 他單體成分之含有率相對於甲基丙烯酸甲酯，較佳在50質 量％以下。 上述可與甲基丙烯酸曱酯共聚之其他單體，較佳為丙 稀酸烷酯類《藉由使用丙烯酸烷酯類作為其他單體，可提 升所得之耐熱性丙烯酸系樹脂的耐熱溫度，且可使成形加 工時的流動性變高。於此種曱基丙烯酸曱酯與丙烯酸烷酯 類之共聚物中，丙烯酸烷酯類單體成分之含有率，從提升 耐熱性的觀點而言，較佳為相對於總單體成分在〇丨質量％ 以上15質量％以下，更佳在〇.2質量％以上14質量％以 下’再更佳為1質量％以上12質量％以下。 上述丙烯酸烷酯類，即使是丙烯酸曱酯及丙烯酸乙酯 與甲基丙烯酸甲酯少量共聚，由於亦可顯著得到上述成形 加工時之流動性的改良效果，故較佳。 上述耐熱性丙烯酸系樹脂，亦可使用同排（is〇tactic ) 聚甲基丙烯酸酯或對排（syndiotactic )聚曱基丙烯酸酯。 又，耐熱性丙烯酸系樹脂亦可直接使用市售品，或是從成 8 201219817 為前驅物之市售品來製造。 製造上述耐熱性丙稀酸系樹脂之方法，可採用以往公 知之方法，例如可採用鑄造聚合、塊狀聚合、懸浮聚人： 溶液聚合、乳化聚合、陰離子聚合等聚合方法。較 使用懸洋劑或乳化劑之塊狀聚合或溶液聚合，藉 :小異物的混入…溶液聚合之情形，可使用甲笨等芳 族烴溶齊卜X，於塊狀聚合之情形時，可藉由加熱所產 之游離自由基或電離性放射線照射來啟動聚合。又，用 :聚合反應之聚合起始劑’例如可使用偶氮雙異丁腈等偶 氮化合物、過氧化苯甲酿、過氧化月桂醯、三級丁過氧一2 一己酸乙酯等有機過氧化物等。 劑 具體而S，可列舉丨，1 —雙（三級丁過氧）一3,3,5 ,又，於90<t以上之溫度條件下進行聚合時，一般雖然 採用’合液聚合’但較佳為在可溶於有機溶劑之聚合起始劑 中’使用10小時半衰期溫度在8〇t以上者。此種聚合起始 杰|| « 曰 fit从一 裒己燒環己燒過氧化物（cyclohexane peroxide )、2 5 2’5 —（苯曱醯過氧（benzoylperoxy ))己院、 禺氮雙（1 J衣己腈（1 — cyclohexanecarbonitrile ))、 (胺甲醯偶氮（earbam〇ylaz。））異丁腈等。此等聚合 起始劑於上述聚合反應之使用量，相對於用於聚合之總 體10〇質量份，較佳為〇 〇〇5〜5質量份。 於聚合反應中’視需要可使用分子量調節劑。此分子 量調節劑，可按 _ J』株用—般於自由基聚合中所使用者。具體而 。例如可使用丁硫醇、辛硫醇、十二烷基硫醇、疏乙酸2 201219817 —乙基己醋等硫醇化合物。此等之分子量調節劑，較佳為 在使上述耐熱性㈣㈣樹脂之分子量成為所欲範圍的濃 度範圍作添加。 另，耐熱性丙烯酸系樹脂之製造方法，例如可使用曰 本特公昭63 - 1964號公報等記載之方法。χ，耐熱性丙稀 酸系樹脂’可藉由將甲基丙烯酸烷酯及/或丙烯酸烷酯與 其他1種類以上之單體加以共聚，製成3元以上之共聚物。 於上述3元以上之共聚物中，與曱基丙烯酸烷酯及/ 或丙烯酸烷酯共聚之其他單體成分，例如可採用苯乙烯、 «—曱基苯乙烯、鄰甲基苯乙烯、對曱基苯乙烯、鄰乙基 笨乙烯、對乙基苯乙烯及對三級丁基苯乙烯等芳香族乙烯 化合物類；丙烯腈、甲基丙烯腈、乙基丙烯腈等不飽和腈 類；Ν—甲基順丁烯二醯亞胺、Ν_乙基順丁烯二醯亞胺、 N J衣己基馬來醯亞胺、Ν —苯基順丁稀二醯亞胺等順丁稀 一醯亞胺類；丙烯醯胺、曱基丙烯醯胺、N_曱基丙烯醯胺、 丁氧基甲基丙稀醯胺（but oxy me thy 1 acrylamide )、N —丙基 甲基丙烯醯胺等（甲基）丙稀醯胺類；順丁烯二酸酐、伊 康酸酐（itaconic acid anhydride )等不飽和羧酸酐類；丙烯 酉变甲基丙稀®久 '巴豆酸、cn —取代之丙稀酸、〇： —取代 之甲基丙烯酸、順丁烯二酸等不飽和羧酸類；（甲基）丙 烯酸曱酯、（甲基）丙烯酸乙酯、（甲基）丙烯酸正丙酯、 (曱基）丙烯酸正丁酯、（甲基）丙烯酸三級丁酯'(甲 基）丙烯酸正己酯、（甲基）丙烯酸環己酯、（甲基）丙 稀酸氣曱酯、（甲基）丙烯酸2—氣乙酯、（曱基）丙烯酸 10 201219817 2 —羥乙酯、（曱基）丙烯酸3 —羥丙酯、（甲基）丙稀酸 2,3,4,5,6 —五羥己酯及（甲基）丙烯酸2,3,4,5 —四羥戊醋等 不飽和羧酸烷酯類等。 構成基質相之樹脂，除了作為主聚合物之耐熱性丙稀 酸系樹脂以外’亦可進一步使用非為耐熱性丙烯酸系樹脂 之丙烯酸系樹脂（以下’亦稱為「丙烯酸系樹脂（a)」。）。 此情形時，於基質相中’耐熱性丙烯酸系樹脂與丙稀酸系 樹脂（a )之各別含量’較佳為丙烯酸系樹脂（& )相對於耐 熱丙稀酸系樹脂之質量比（丙烯酸系樹脂（a ) /耐熱性丙 烯酸系樹脂）在0.1/99.9以上5〇/5〇以下。藉由調整丙 稀酸系樹脂（a )與耐熱性丙烯酸系樹脂之質量比，而可調 節所得之保護片的光彈性係數及玻璃轉移溫度（丁^ )。上 述質量比較佳為0.1/99.9以上40/ 60以下，更佳為〇1/ 99_9以上35/ 65以下。 上述耐熱性丙烯酸系樹脂藉由凝膠滲透層析儀（Gpc ) 之聚曱基丙烯酸甲酯（PMMA )換算的重量平均分子量 (Mw)，較佳為i萬以上4〇萬以下，更佳為4萬以上％ 萬以下，#更佳為7萬以上2〇萬以下。藉由使上述耐熱性 丙烯酸系樹脂t Mw為上述範圍，可提升所得之保護片的 強度’且可提升保護片成形之 量分布（Mw/Μη)較佳在1.8 加工性及流動性。又，分子 以上3 0以下，更佳在1.8 以上2.7以下，再更佳在18以上2 5以下 上述耐熱性丙烯酸系樹脂亦 子量等不同之2種以上的耐熱性 可為單體成分之組成、 丙烯酸系樹脂的混合物 分 〇 201219817 此時’上述重量平均分子量意指其平均值。 上述财熱性丙烯酸系樹脂之維卡軟化溫度（vicat softening temperature)，較佳在 105。(：以上 14〇°c 以下，更 佳在U(TC以上，再更佳在12(TC以上。又’耐熱性丙烯酸 系樹脂之玻璃轉移溫度（T g )，較佳在1 1 〇 以上，更佳在 115 C以上’再更佳在120ec以上。耐熱性丙烯酸系樹脂之 熔化指數（ASTM D1238 M條件），從所得之保護片之強 度的觀點而言，較佳在10g/10分以下，更佳在6g/i〇分 以下，再更佳在3g/l〇分以下。 當耐熱性丙烯酸系樹脂為不含有芳香族乙烯單體作為 單體成分之耐熱性丙烯酸系樹脂（以下，亦稱為「耐熱性 丙烯酸系樹脂（1 )」。）時，耐熱性丙烯酸系樹脂（i) 中之丙烯酸系單體成分的含有率，較佳為相對於構成耐熱 性丙烯酸系樹脂（1 )之總單體成分在40質量％以上。此 丙烯酸系樹脂（1)，例如可使用將選自曱基丙烯酸環己酯、 甲基丙烯酸三級丁環己酯、甲基丙烯酸甲酯等甲基丙烯酸 醋；丙稀酸曱醋、丙稀酸乙酯、丙烯酸丁酯、丙烯酸異丙 酯、丙烯酸2—乙基己酯等丙烯酸酯之丨種以上的單體加以 聚合而成者。 上述丙烯酸系樹脂（1 )之重量平均分子量較佳在5萬 以上20萬以下，更佳在7萬以上15萬以下。藉由使此重 量平均分子量為上述範圍，可使所得之保護片具有優異之 強度，且保護片成形時具有優異之成形加工性及流動性。 並且，構成基質相之耐熱性丙烯酸系樹脂，當合併使 12 201219817 t 3芳香族乙烯系單體作為單體成分之耐熱性丙烯酸系樹 月曰與不含上述芳香族乙烯系單體作為單體成分之丙烯酸 系樹脂（1 )時，亦瓦 于7Γ 了進一步合併使用其他之丙烯酸系樹脂。 此情時，f- 甘 上这其他之丙烯酸系樹脂的含量相對於構成基 質相之總樹脂1 〇 〇暂旦、 曰ιυϋ質里伤，較佳在20質量份以下，更佳在 質量伤以下。上述耐熱性丙烯酸系樹脂（1)之含量相對 於構成基質相之總樹脂】00質量份，較佳在】質量份以上 50質量伤以下，更佳在〇丨質量份以上質量份以下，尤 佳在〇.1質量份以上35質量份以下。並且，上述财熱性丙 烯酸系樹脂之含量相對於構成基質相之總樹脂100質量 份，較佳在50質量份以上99 9質量份以下，更佳在6〇質 里伤以上99.9質量份以下，再更佳在65質量份以上99 9 質量伤以下。藉由使基質相中之耐熱性丙烯酸系樹脂的含 量為上述範圍，可提升所得之保護片的耐熱性。又，藉由 使用主鏈具有環結構之耐熱性丙烯酸系樹脂，可使該保護 片之耐熱性變高。 <分散相> 上述分散相含有丙烯酸系橡膠作為主聚合物。此丙稀 酸系橡膠意指含有丙稀酸及甲基丙稀酸、以及此等之衍生 物等的丙烯酸系單體作為單體成分的橡膠。丙烯酸系橡膠 可僅由丙烯酸系單體構成，或亦可由丙烯酸系單體與其他 單體構成。丙烯酸系單體可列舉曱基丙烯酸曱酯、甲基丙 烯酸乙酯、甲基丙烯酸正丁酯、曱基丙烯酸烯丙酯（aUyl methacrylate )、丙烯酸曱酯、丙烯酸乙酯、丙烯酸異丙酯、 13 201219817 丙稀酸正丁醋等。其他之單冑，例如可列舉笨乙稀… 甲基苯乙稀'2—曱基笨乙烯、4—曱基苯乙烯、2,4—二乙 基笨乙烯、4- 丁氧基笨乙烯、N，N—二曱胺基笨乙烯等芳 香族乙烯化合物；丙烯腈、甲基丙烯萨 巧碲猾、一氰亞乙烯等α, 沒-乙烯性不飽和腈化合物；乙酸乙烯@旨、丙酸乙烯醋等 乙烯酯化合物，乙基乙烯醚（ethylvinylether)、十六其乙 稀醚（cetylvinylether ) 、蘇 « y 經丁基乙烯醚 (hydroxybutylvinylether )等乙烯醚化合物等。此等其他之 單體可分別單獨使用或混合2種以上使用。 ' 上述丙烯酸系橡膠亦可使用交聯劑來交聯。交聯劑例 如可列舉硫；2,4 一二氣過氧化苯甲醯、過氧化苯甲酿、二 三級丁基過氧二異丙苯等有機過氧化物；一硫化四甲基秋 蘭姆（tetramethylthiuram m0nosulfide )、二硫化四曱基秋 蘭姆（tetramethylthiuram disulfide )等有機硫化合物；對醌 二肟（P- quinone dioxime)、p，p，一二苯甲醯醌二肟（pp， —dibenzoylquinone dioxime )等肟化合物；六亞甲基二胺胺 甲酸酯等多胺等。當使用交聯劑時，視需要例如亦可使用 聯苯胍、二曱胺二硫甲酸辞（zinc dimethyldithi〇carbamate )、 2 —氫硫苯并噻唑、硫化二苯并噻唑等加硫促進劑 上述分散相之平均粒徑為1 nm以上未達5〇ηιη，較佳為 2nm以上未達5〇nm，更佳為3nm以上未達50nm。若分散 相之平均粒控未達上述下限，則保護片之可撓性有下降之 虞°相反地’若平均粒徑超過上述上限，則保護月之透明 性有劣化之虞。 201219817 於該保護片中， ^^ 上述刀散相之含量相對於上述保護片 較佳在5質量％以上旦 4〇質里％以下，更佳在10質量％以 上質量％以下，玉 #八也 丹更佳在20質量％以上30質量％以下。 右为散相之含量夫违 運上边下限，則保護片之可撓性有下降 之虞。相反地若分％ > a θ 刀政相之含置超過上述上限，則保護片之 透明性有劣化之虞。 此刀政相可採用具有多層結構者。此多層結構例如可 &用由核〜夕卜殼結構所構成的二層結構、由中心硬質層 與軟質層與最外硬質層所構成的三層結構、或在軟質層與 最外硬質層之間進—步具有中間硬質層的四層結構等。 上述一層結構，例如可形成為由核心層與外殼層構成 的核心-外殼結構，其中該核心層係由橡膠狀聚合物構 成亥外殼層則是由丙烯酸樹脂系之玻璃狀聚合物構成。 另用於核〜層之橡膠狀聚合物，只要是在常溫呈橡膠狀， 則無特別限$，例士0可採肖α 了二稀為主成分之橡膠狀聚 &物（例如丁二烯均聚物、丁二烯—芳香族乙烯共聚物 等）、或以丙埽酸烷酯為主成分之橡膠狀聚合物（例如丙 烯酸丁酯_苯乙烯共聚物、丙烯酸2—乙基己酯一苯乙烯共 聚物等）等。另，較佳為採用丁二烯一苯乙烯共聚物，藉 此可提升強度、生產性及透明性。又，用於外殼層之玻璃 狀聚合物’只要是在常溫呈玻璃狀之丙烯酸系聚合物，則 無特別限定’例如可使用甲基丙烯酸甲酯均聚物、甲基丙 烯酸曱酯一丙烯酸曱酯共聚物等。 又’具有三層以上之多層結構的分散相，可舉橡膠狀 15 201219817 聚合物構成之軟質層、與玻璃狀聚合物構成之硬質層積層 三層以上而構成者。用於軟質層之橡膠狀聚合物及用於硬 質層之玻璃狀聚合物，可使用上述二層結構之橡膠粒子所 説明者。 另，在不會損害本發明之效果下，除了構成基質相之 耐熱性丙烯酸系樹脂、及構成分散相之丙烯酸系橡膠以 外，亦可混合其他共聚物。另，其他之共聚物例如可列舉 聚乙烯、聚丙烯等聚烯（polyolefin)系樹脂；聚醯胺樹脂； 聚苯硫樹脂；聚醚醚酮樹脂；聚酯、聚砜、聚亞苯基氧化 物（polyphenylene oxide )、聚醯亞胺、聚醚醢亞胺、聚縮 醛等熱可塑性樹脂；及酚樹脂、三聚氰胺樹脂、矽氧樹脂、 環氧樹脂等熱硬化性樹脂等。其他之共聚物可單獨或混合 複數種。另，其他之共聚物的含量，較佳為相對於基質相 100質量份在20質量份以下。 <紫外線吸收劑> 該保護片’於上述基質相中含有紫外線吸收劑。藉由 使該保護片在基質中含有紫外線吸收劑，可具有使該保護 片不易黃化的效果。又’當在片狀偏光元件兩面積層該保 護片而形成偏光板時，可抑制紫外線穿透偏光元件。且較 佳為上述分散相中進一步含有此紫外線吸收劑。藉由使分 散層中進一步含有紫外線吸收劑，可提升該保護片中之紫 外線吸收劑的分散均勻性，當在片狀偏光元件兩面積層該 保護片而形成偏光板時，可進一步抑制紫外線穿透偏光元 件0 16 201219817 上述紫外線吸收劑可使用苯并三唑系化合物，其他則 可從二苯甲酮系化合物、苯甲酸酯系化合物、三命系化合 物、受阻胺（hindered amine )系化合物、乙二酸苯胺（〇xalic acid anilide )系化合物、甲脒系化合物、經基苯甲酸酯系化 合物、鎳系化合物等作適當選擇。此等可單獨使用或亦可 組合複數種使用。又紫外線吸收劑，為了防止偏光板劣化， 較佳為波長370nm以下之紫外線吸收能力優異，且為了有 效利用可見光，較佳為對波長400nm以上之可見光的吸收 /J\ 〇 另，作為紫外線吸收劑’於上述列舉之化合物中，由 於上述苯并三唑系化合物、二苯甲酮系化合物、苯甲酸酯 系化合物及三啩系化合物的透明性高，且防止偏光板劣化 之：果優異’故較佳。尤其更佳為採用由著色更少且透明 性高之苯并三唑系化合物構成的紫外線吸收劑。 上述笨并三唑系化合物之具體例，可列舉2— ( 2，一 羥一 5’ ~甲苯基）苯并三唑、2—[2， _羥一3，，5， 一雙 (α，α ~二甲基节基）苯基]苯并三唑、， ν ς, ^ 1 ~ Η - ，5 —二三級丁基苯基）苯并三唑' 2— (2,—羥一 3， :三級丁基-5’ -甲苯基)-5-氣化笨并三唑、二2, 二二3，5,—二三級丁基苯基）-5-氣化笨并三唑、2 乙 經一 3,，5, -二三級戊基苯基）笨并三啥、2 — m —三級辛基苯基）苯并三唑、2,2， 基-雙[4~~ (l，l，3,3-四甲基丁基）_6一（2h、 一 —2-基）苯酚]、甲基_3_[ 本二唑 —級丁基—5— (2h—苯并 17 201219817 三嗤一2—基）一4 —羥苯基]丙酸酯與聚乙二醇之縮合物、2 一（2—羥苯基）苯并三唑共聚物、2一（2’ 一經—4，_ 辛氧苯基）一2H—笨并三唾、2— (2H —苯并三。坐—2 —基） 一 4—曱基一 0— ( 3,4,5,6—四氫酞醯亞胺基甲基）笨酚' 2,2 一亞甲基雙（4 —三級丁基一6_2H —苯并三唑基苯 酚）、2,2’ 一亞曱基雙（4一三級辛基一 6— 2H—苯并三唑 基苯齡）等。市售品則可列舉商品名「KEMISORB279」201219817 VI. Description of the Invention: [Technical Field of the Invention] The present invention relates to a protective sheet and a polarizing plate. [Prior Art] In recent years, liquid crystal display devices have been widely used in place of CRTs because they are thin, light, and consume little power. Specifically, liquid crystal display devices are widely used from small items such as computers and clocks to large-scale items such as automobile measuring instruments, PC screens, and televisions. The liquid crystal display element incorporated in the liquid crystal display device has a liquid crystal cell and a polarizing plate disposed on one of the two sides of the liquid crystal cell. The polarizing plate includes a sheet-shaped polarizing element and a protective sheet disposed on one of two sides of the polarizing element. The protective sheet is a sheet for protecting the structure of the polarizing element, and is generally formed of triacetylcellulose (hereinafter referred to as "TAC") having a small birefringence and excellent transparency. However, the heat and humidity resistance of the TAC is not sufficient. When a polarizing plate using TAC as a protective film for a polarizing element is used under high temperature or high humidity, there is a disadvantage that the performance of the polarizing plate such as the degree of polarization and the color tone is lowered. i 相位 A phase difference occurs in incident light in an oblique direction. In recent years, with the increase in the size of liquid crystal displays, the phase difference has been shown to affect the viewing angle characteristics. Therefore, the research was conducted using a sturdy acrylic resin instead of TAC. Specifically, δ is a study of a matrix phase having a polymer, and a seaplate structure protective sheet containing "... 夂糸 夂糸 曰 曰 ( ( ( ( 例 例 例 例 例 例 例 例 ( ( 海岛 海岛 海岛 海岛 海岛 海岛 海岛 海岛 海岛 海岛 海岛 海岛 海岛 海岛 海岛 海岛 海岛 海岛 海岛In the protective sheet of the above-mentioned Japanese Patent Publication No. 201-70646, the average particle diameter of the acrylic rubber of the dispersed phase is relatively large 〇〇5 〇 〇 '35 / In the case of the present invention, the problem of the present invention is solved in view of such a problem. A protective sheet having heat resistance and flexibility and high transparency is provided, and a polarizing plate having the protective sheet. The invention for solving the above problems is: a protective sheet having a heat-resistant acrylic system a sea-island structure protective sheet having a resin as a matrix phase of a main polymer and a dispersed phase containing an acrylic rubber as a main polymer; a difference in refractive index between the matrix phase and the dispersed phase is 〇〇1 or less; The average particle diameter of the dispersed phase is 1 nm or more and less than 5 〇 nm. In the protective sheet, the matrix phase contains a heat-resistant acrylic resin as a main polymer, and the dispersed phase contains an acrylic rubber as a main polymer, so that it is not only heat-resistant. Properties and flexibility, and the difference in refractive index between the matrix phase and the dispersed phase is 〇.〇1 or less, and since the average particle diameter of the dispersed phase is less than 50 nm in the range of inm or more, transparency is high, in particular, due to the dispersion layer The average particle size is less than 5〇nrn, so extremely high transparency can be obtained. That is to say, particles that are theoretically smaller than one-half of the wavelength of visible light do not adversely affect transparency, but actually because of the short-wavelength side. In the case of the visible light, it is white and turbid. 4 201219817, as long as it is less than 5 〇 nm as described above, that is, it is not affected by the visible light on the short-wavelength side, and extremely high transparency is obtained. The content of the dispersed phase is preferably 5% by mass or more and 40% by mass or less. Since it is at least the above lower limit value, the necessary flexibility can be sufficiently exhibited, and X is sufficient to be equal to or less than the above upper limit value. Further, in the protective sheet, the retardation value in the planar direction is preferably 〇nm or more and 15 nm or less, and the retardation value in the thickness direction is -15 nm or more and 〇nm or less. The transmitted light of the sheet is less likely to cause a phase difference, so that even if a protective sheet which is a sheet having a polarizing function such as a polarizing plate is used, there is an advantage that the polarizing function is not hindered. Further, in the protective sheet, a heat-resistant acrylic resin is used. The total light transmittance is preferably 90% or more, whereby sufficient transparency can be obtained. Further, the Vicat softening point is preferably 1 〇 5 t or more and i 4 (rc or less). When the protective sheet of the optical plate of the material example (4) is used, it is sufficient to have a t-heat property, and when it is at most the above upper limit value, the heat-resistant acrylic resin is easily melted when the protective sheet is produced, and the manufacturing is easy. . The heat resistant acrylic resin preferably has a ring structure in the main chain. Thereby, the protective sheet can have an effect of higher heat resistance. Further, in the protective sheet, it is preferable to perform mat processing on one side or both sides. As a result, there is an advantage that it is easy to attach the surface subjected to the matte processing to other members by means of an adhesive or the like. For example, the surface on which the matting process has been performed may be followed by a polarizing element using a water-based adhesive, and the protective sheet is firmly adhered to the polarizing element to form a polarizing plate in 201219817. Further, in the protective sheet, it is preferable to provide a hard coat layer laminated on one side, and the scratch resistance can be improved by the hard coat layer. Further, the hard coat layer is preferably formed by applying an acrylic paint, whereby the transparency of the sheet can be ensured. Further, the invention also includes a polarizing plate comprising a sheet-shaped polarizing element and a protective layer for laminating one of the polarizing elements on both sides of the polarizing element. As described above, the protective sheet of the present invention has heat resistance and flexibility, and has high transparency. [Embodiment] Hereinafter, a protective sheet of an embodiment of the present invention will be described with reference to an appropriate drawing. The protective sheet of the present embodiment has a matrix phase containing a heat-resistant acrylic resin as a main polymer and a dispersed phase containing an acrylic rubber as a main polymer. In the protective sheet, the dispersed phase is dispersed in the matrix phase to form a sea-island structure. Each phase will be described below. <Matrix phase> The above matrix phase contains a heat-resistant acrylic resin as a main polymer. The heat-resistant acrylic resin means a polymer containing an acrylic monomer such as acrylic acid, mercaptoacrylic acid or the like as a monomer component. Examples of the heat-resistant acrylic resin include an alkyl methacrylate selected from the group consisting of methacrylic acid cycloheximide, mercaptopropyl tertiary butyl cyclohexyl acrylate, and decyl decyl acrylate; And an alkyl acrylate such as ethyl acrylate, butyl acrylate, isopropyl acrylate or 2-ethylhexyl acrylate or a plurality of kinds of acrylic monomers are polymerized. The heat-resistant acrylic acid system 6 201219817 The resin also contains an acrylic monomer and other monomer components. In the case of such copolymerization, the content ratio (copolymerization ratio) of the other monomer component is preferably 60% by mass or less, more preferably 5% by mass or less, based on the total monomer component constituting the heat-resistant acrylic resin. More preferably, it is 4% by mass or less. The heat-resistant acrylic resin is preferably a polymer containing methyl methacrylate as a monomer component. By containing the methyl methacrylate as a monomer component in the heat-resistant acrylic resin, the compatibility of the obtained heat-resistant acryl-based resin can be improved. The polymer "containing methyl methacrylate as a monomer component" may, for example, be a homopolymer of methyl methacrylate, a copolymer of methyl methacrylate and another monomer, or the like. Other monomers copolymerizable with decyl methacrylate may, for example, be alkyl methacrylates other than methyl methacrylate; alkyl acrylates; α-hydroxyalkyl acrylates; styrene, ortho Alkyl-substituted stupyl ethylene, α-mercaptostyrene, α-, such as styrene, p-methylstyrene, 2,4-dimethylstyrene, ethylstyrene, p-tert-butylstyrene An aromatic vinyl compound such as styrene-based styrene-based styrene substituted with α-alkyl group; an unsaturated nitrile such as acrylonitrile or methacrylonitrile; fluorenyl-phenyl-butyleneimine , ν-cyclohexylmaleimide (m-cyclohexylmaleimide), such as maleic acid imide, unsaturated carboxylic acid anhydride such as maleic anhydride; acrylic acid, methacrylic acid, maleic acid, etc. Saturated carboxylic acids and the like. These other monomers are preferably α-hydroxyethyl methacrylate, styrene, alkyl-substituted styrene, from the viewpoint of improving the flexibility and heat resistance of the protective sheet obtained. The styrene substituted with α-alkyl group, the unsaturated acid retardant, more preferably 〇-201220127 alkyl methacrylate, styrene, α-alkyl substituted styrene, unsaturated carboxylic acid, of which More preferably, it is α-hydroxydecyl acrylate, styrene, α-methylstyrene, methacrylic acid. When the alkyl hydroxy methacrylate is used as another monomer and copolymerized with decyl methacrylate, the heat resistance obtained is further obtained by performing a dehydration reaction because a lactone ring containing a partial polymer main bond is formed. The heat resistance of the acrylic resin is improved. These monomers may be used singly or in combination of plural kinds. In the copolymer of such methyl methacrylate and other monomers, the content of the other monomer component is preferably 50% by mass or less based on the methyl methacrylate. The other monomer copolymerizable with methacrylate methacrylate, preferably an alkyl acrylate, "the heat resistance temperature of the obtained heat-resistant acrylic resin can be improved by using an alkyl acrylate as another monomer, and The fluidity during the forming process can be increased. In the copolymer of the decyl acrylate and the alkyl acrylate, the content of the alkyl acrylate monomer component is preferably from the viewpoint of improving heat resistance with respect to the total monomer component. The mass% is 15% by mass or more, more preferably 2% by mass or more and 14% by mass or less, and even more preferably 1% by mass or more and 12% by mass or less. The alkyl acrylates described above are preferably obtained by copolymerizing a small amount of decyl acrylate and ethyl acrylate with methyl methacrylate in a small amount, since the fluidity at the time of the above-mentioned forming process can be remarkably improved. As the heat-resistant acrylic resin, an isobaric polymethacrylate or a syndiotactic polydecyl acrylate may also be used. Further, the heat-resistant acrylic resin may be produced by directly using a commercially available product or a commercial product which is a precursor of ed. The method for producing the above-mentioned heat-resistant acrylic resin may be a conventionally known method, and for example, a polymerization method such as casting polymerization, bulk polymerization, suspension polymerization, solution polymerization, emulsion polymerization, or anionic polymerization may be employed. Compared with the bulk polymerization or solution polymerization using an overhanging agent or an emulsifier, by the mixing of small foreign matter... in the case of solution polymerization, an aromatic hydrocarbon such as a stupid hydrocarbon can be used to dissolve the X. In the case of bulk polymerization, The polymerization is initiated by heating free radicals or ionizing radiation. Further, as the polymerization initiator for the polymerization reaction, for example, an azo compound such as azobisisobutyronitrile, benzoyl peroxide, lauric acid peroxide, tertiary butyl peroxy-2-ethylhexanoate or the like can be used. Peroxide and the like. Specific examples of the agent may include hydrazine, 1 - bis (tertiary butyl peroxy) - 3, 3, 5, and when polymerization is carried out at a temperature of 90 lt or more, generally, 'liquid polymerization" is employed. It is preferred to use a 10-hour half-life temperature of 8 Torr or more in a polymerization initiator which is soluble in an organic solvent. This kind of polymerization starter|| « 曰fit from cyclohexane peroxide, 2 5 2'5 - (benzoylperoxy) hexazone, bismuth bis ( 1 J hexonitrile (1 - cyclohexanecarbonitrile), (amino arsenazo (earbam 〇 yaz)) isobutyronitrile, and the like. The amount of the polymerization initiator to be used in the above polymerization is preferably from 5 to 5 parts by mass based on 10 parts by mass of the total of the polymerization. In the polymerization reaction, a molecular weight modifier can be used as needed. This molecular weight regulator can be used as a user in the radical polymerization according to the _J strain. Specifically. For example, a thiol compound such as butyl mercaptan, octyl mercaptan, dodecyl mercaptan, or acetic acid 2 201219817 - ethyl hexanoic acid can be used. These molecular weight modifiers are preferably added in a concentration range in which the molecular weight of the heat-resistant (4) (iv) resin is within a desired range. In the method for producing a heat-resistant acrylic resin, for example, a method described in, for example, JP-A-63-1964 can be used. χ, the heat-resistant acryl-based resin ‘ can be obtained by copolymerizing an alkyl methacrylate and/or an alkyl acrylate with one or more other monomers to form a copolymer of three or more. In the above copolymer of more than 3 yuan, other monomer components copolymerized with the alkyl methacrylate and/or the alkyl acrylate may be, for example, styrene, «-decyl styrene, o-methyl styrene, orthoquinone. Aromatic vinyl compounds such as styrene, o-ethyl stupidene, p-ethyl styrene and p-tert-butyl styrene; unsaturated nitriles such as acrylonitrile, methacrylonitrile and ethacrylonitrile; Methyl maleimide, Ν-ethyl maleimide, NJ, hexyl-maleimide, fluorene-phenyl cis-butylimine, etc. Class; acrylamide, mercapto acrylamide, N_mercapto acrylamide, butoxymethyl thy amide, N-propyl methacrylamide, etc. Alkyl amides; unsaturated carboxylic anhydrides such as maleic anhydride and itaconic acid anhydride; propylene oxime methyl methacrylate® long- crotonic acid, cn-substituted acrylic acid, 〇: - Substituted unsaturated carboxylic acids such as methacrylic acid and maleic acid; decyl (meth) acrylate, (methyl Ethyl acrylate, n-propyl (meth) acrylate, n-butyl (meth) acrylate, n-butyl (meth) acrylate (n-hexyl) (meth) acrylate, cyclohexyl (meth) acrylate, (Methyl) acetoacetic acid ester, 2-methyl ester (meth) acrylate, (mercapto) acrylic acid 10 201219817 2-hydroxyethyl ester, 3-hydroxypropyl (meth) acrylate, (methyl) 2,3,4,5,6-pentahydroxyhexyl acrylate and unsaturated carboxylic acid alkyl esters such as 2,3,4,5-tetrahydroxypentaacetic acid (meth)acrylic acid. The resin constituting the matrix phase may be an acrylic resin other than the heat-resistant acrylic resin (hereinafter referred to as "acrylic resin (a)" in addition to the heat-resistant acrylic resin as the main polymer. .). In this case, the respective contents of the 'heat-resistant acrylic resin and the acrylic resin (a)' in the matrix phase are preferably the mass ratio of the acrylic resin (&) to the heat-resistant acrylic resin ( The acrylic resin (a) / heat resistant acrylic resin) is 0.1/99.9 or more and 5 〇/5 〇 or less. The photoelastic coefficient and the glass transition temperature (d) of the obtained protective sheet can be adjusted by adjusting the mass ratio of the acrylic resin (a) to the heat-resistant acrylic resin. The above quality is preferably 0.1/99.9 or more and 40/60 or less, more preferably 〇1/99_9 or more and 35/65 or less. The heat-resistant acrylic resin preferably has a weight average molecular weight (Mw) in terms of polymethyl methacrylate (PMMA) of a gel permeation chromatograph (Gpc), preferably from 1,000,000 to 40,000, more preferably More than 40,000% or less, #更更为70,000 or more and 2 million or less. When the heat-resistant acrylic resin t Mw is in the above range, the strength of the protective sheet obtained can be increased, and the amount of formation of the protective sheet (Mw/Μη) can be improved to preferably 1.8 workability and fluidity. In addition, the heat resistance of two or more kinds of the above-mentioned heat-resistant acrylic resin, which is more preferably 18 or less, more preferably 1.8 or more and 2.7 or less, more preferably 18 or more and 25 or less, may be a composition of a monomer component. , A mixture of acrylic resin, 201219817 At this time, the above weight average molecular weight means the average value thereof. The vicin softening temperature of the above-mentioned finstock acrylic resin is preferably 105. (: The above 14 〇 °c or less, more preferably U (TC or more, even more preferably 12 (TC or more. Also 'heat-resistant acrylic resin glass transition temperature (T g ), preferably more than 11 〇, More preferably, it is more preferably 115 C or more, and even more preferably 120 ec or more. The melting index of the heat-resistant acrylic resin (ASTM D1238 M condition) is preferably 10 g/10 minutes or less from the viewpoint of the strength of the obtained protective sheet. The heat-resistant acrylic resin is a heat-resistant acrylic resin that does not contain an aromatic vinyl monomer as a monomer component (hereinafter, also referred to as 6 g/i. In the case of the heat-resistant acrylic resin (1), the content of the acrylic monomer component in the heat-resistant acrylic resin (i) is preferably the total amount of the heat-resistant acrylic resin (1). The monomer component is 40% by mass or more. For the acrylic resin (1), for example, methacrylic acid vinegar selected from cyclohexyl methacrylate, dimethyl butyl methacrylate or methyl methacrylate can be used. ; acrylic acid vinegar, ethyl acrylate, acrylic acid A monomer having an acrylate or the like of an ester, isopropyl acrylate or 2-ethylhexyl acrylate is polymerized. The weight average molecular weight of the acrylic resin (1) is preferably 50,000 or more and 200,000 or less. More preferably, it is 70,000 or more and 150,000 or less. By setting the weight average molecular weight to the above range, the obtained protective sheet can have excellent strength, and the protective sheet has excellent moldability and fluidity during molding. The heat-resistant acrylic resin constituting the matrix phase is a heat-resistant acrylic tree containing a 12 201219817 t 3 aromatic vinyl monomer as a monomer component and containing no aromatic aromatic monomer as a monomer component. In the case of the acrylic resin (1), it is also used in combination with other acrylic resins. In this case, the content of the other acrylic resin on the f-gan is relative to the total resin of the matrix phase. The damage of the dentin or the enamel is preferably 20 parts by mass or less, more preferably less than the mass damage. The content of the heat-resistant acrylic resin (1) is relative to the matrix phase. The total amount of the resin is preferably 00 parts by mass, more preferably 50 parts by mass or less, more preferably 5% by mass or less, more preferably 3% by mass or more and 35 parts by mass or less. The content of the acrylic resin is preferably 50 parts by mass or more and 99 parts by mass or less, more preferably 99.9 parts by mass or less, more preferably at 65 mass%, based on 100 parts by mass of the total resin constituting the matrix phase. The heat resistance of the obtained protective sheet can be improved by setting the content of the heat-resistant acrylic resin in the matrix phase to the above range. Further, by using a heat-resistant acrylic having a ring structure in the main chain. The resin can make the heat resistance of the protective sheet high. <Disperse phase> The above dispersed phase contains an acrylic rubber as a main polymer. The acrylic rubber refers to a rubber containing an acrylic monomer such as acrylic acid and methyl acrylate, and the like as a monomer component. The acrylic rubber may be composed only of an acrylic monomer, or may be composed of an acrylic monomer and another monomer. Examples of the acrylic monomer include decyl methacrylate, ethyl methacrylate, n-butyl methacrylate, aUyl methacrylate, decyl acrylate, ethyl acrylate, isopropyl acrylate, and 13 201219817 Acetate n-butyl vinegar and so on. Other single oximes, for example, may be exemplified by stupid ethylene... Methyl styrene succinyl 2, fluorenyl styrene, 4 fluorenyl styrene, 2,4-diethyl styrene, 4-butoxy styrene, An aromatic vinyl compound such as N,N-diguanamine-based stupid ethylene; α, a-ethylenically unsaturated nitrile compound such as acrylonitrile, methacrylic acid, or cyanoethylene; vinyl acetate@, propionic acid A vinyl ester compound such as ethylene vinegar, ethyl vinylether, cetylvinylether, or a vinyl ether compound such as hydroxybutylvinylether. These other monomers may be used alone or in combination of two or more. The above acrylic rubber may be crosslinked by using a crosslinking agent. Examples of the crosslinking agent include sulfur; an organic peroxide such as 2,4-dibenzoic acid benzoquinone, benzoyl peroxide, and di-terternary butylperoxydiisopropylbenzene; Organic sulfur compounds such as tetramethylthiuram m0nosulfide and tetramethylthiuram disulfide; P-quinone dioxime, p, p, bisbenzoquinone dioxime (pp, Dibenzoylquinone dioxime) is an isobaric compound; a polyamine such as hexamethylenediamine carbamate or the like. When a crosslinking agent is used, for example, a sulphur promoter such as biphenyl hydrazine, zinc dimethyldithicarbamate, 2-hydrothiobenzothiazole or dibenzothiazyl sulfide may be used. The average particle diameter of the dispersed phase is 1 nm or more and less than 5 〇ηηη, preferably 2 nm or more and less than 5 〇 nm, more preferably 3 nm or more and less than 50 nm. If the average particle size of the dispersed phase does not reach the above lower limit, the flexibility of the protective sheet is lowered. Conversely, if the average particle diameter exceeds the above upper limit, the transparency of the protective month is deteriorated. 201219817 In the protective sheet, the content of the above-mentioned knives is preferably 5% by mass or more, more preferably 10% by mass or less, more preferably 10% by mass or more, and more preferably 10% by mass or less. Dan is better than 20% by mass to 30% by mass. On the right, the content of the scattered phase violates the lower limit of the upper side, and the flexibility of the protective sheet is degraded. On the other hand, if the % > a θ knife policy phase is more than the above upper limit, the transparency of the protective sheet is deteriorated. This knife policy can be used with a multi-layer structure. The multilayer structure can, for example, be a two-layer structure composed of a core-to-small shell structure, a three-layer structure composed of a central hard layer and a soft layer and an outermost hard layer, or a soft layer and an outermost hard layer. A four-layer structure having an intermediate hard layer and the like is advanced. The above-mentioned one-layer structure can be formed, for example, as a core-shell structure composed of a core layer and an outer shell layer, wherein the core layer is composed of a rubbery polymer and a shell-like layer composed of an acrylic resin-based glassy polymer. In addition, the rubber-like polymer used for the core to the layer is not particularly limited to $ as long as it is rubber at a normal temperature, and the compound 0 can be used as a rubbery poly-and-prepared substance having a dilute as a main component (for example, Ding Er) a rubber-like polymer mainly composed of an alkene homopolymer, a butadiene-aromatic ethylene copolymer, or an alkyl propyl acrylate (for example, butyl acrylate styrene copolymer, 2-ethylhexyl acrylate) a styrene copolymer, etc.). Further, it is preferred to use a butadiene-styrene copolymer, thereby improving strength, productivity, and transparency. In addition, the glassy polymer used for the outer shell layer is not particularly limited as long as it is a glass-like acrylic polymer at normal temperature. For example, methyl methacrylate homopolymer or methacrylate-acrylic acid ruthenium acrylate can be used. Ester copolymers and the like. Further, the dispersed phase having a multilayer structure of three or more layers may be composed of a soft layer composed of a polymer 15 201219817 polymer and a hard layer composed of a glass polymer. The rubbery polymer used for the soft layer and the glassy polymer used for the hard layer can be used as described above for the rubber particles of the two-layer structure. Further, in addition to the effect of the present invention, other copolymers may be mixed in addition to the heat-resistant acrylic resin constituting the matrix phase and the acrylic rubber constituting the dispersed phase. Further, examples of the other copolymer include a polyolefin resin such as polyethylene or polypropylene; a polyamide resin; a polyphenylene sulfide resin; a polyether ether ketone resin; and a polyester, polysulfone, and polyphenylene oxide. Thermoplastic resins such as polyphenylene oxide, polyimine, polyether oxime, and polyacetal; and thermosetting resins such as phenol resin, melamine resin, oxime resin, and epoxy resin. Other copolymers may be used singly or in combination. Further, the content of the other copolymer is preferably 20 parts by mass or less based on 100 parts by mass of the matrix phase. <Ultraviolet absorber> The protective sheet ' contains an ultraviolet absorber in the matrix phase. By providing the protective sheet with an ultraviolet absorber in the matrix, it is possible to have an effect of making the protective sheet less yellow. Further, when the protective sheet is formed on the two-layer layer of the sheet-like polarizing element to form a polarizing plate, it is possible to suppress ultraviolet rays from penetrating the polarizing element. Further preferably, the above-mentioned dispersed phase further contains the ultraviolet absorber. By further including the ultraviolet absorbing agent in the dispersion layer, the dispersion uniformity of the ultraviolet absorbing agent in the protective sheet can be improved, and when the protective sheet is formed on the two-layer layer of the sheet-shaped polarizing element to form a polarizing plate, ultraviolet ray penetration can be further suppressed. Polarizing element 0 16 201219817 A benzotriazole-based compound can be used as the ultraviolet absorber, and a benzophenone-based compound, a benzoate-based compound, a trivalent compound, a hindered amine compound, or the like can be used. An oxalic acid anilide compound, a formamidine compound, a benzoyl compound, a nickel compound, or the like is appropriately selected. These may be used singly or in combination of plural kinds. Further, in order to prevent deterioration of the polarizing plate, the ultraviolet absorbing agent is preferably excellent in ultraviolet absorbing ability at a wavelength of 370 nm or less, and preferably absorbs visible light having a wavelength of 400 nm or more in order to effectively utilize visible light, and is also used as an ultraviolet absorbing agent. In the above-mentioned compounds, the benzotriazole-based compound, the benzophenone-based compound, the benzoate-based compound, and the triterpenoid compound have high transparency and prevent deterioration of the polarizing plate: Therefore, it is better. More preferably, it is preferably an ultraviolet absorber composed of a benzotriazole compound having less color and high transparency. Specific examples of the above-mentioned stupid triazole-based compound include 2-(2,1-hydroxy-5'-tolyl)benzotriazole, 2-[2, _hydroxy-3, 5, and a double (α, α-Dimethyl]phenyl]benzotriazole, ν ς, ^ 1 ~ Η - , 5 - di-tert-butylphenyl) benzotriazole ' 2 - (2, -hydroxy- 3 , : Tert-butyl-5'-tolyl)-5-vaporized stupid triazole, 2,2,2,3,5,2-di-tert-butylphenyl)-5-vaporized stupid triazole 2, E3, 3, 5, - 2, 3, pentylphenyl), stupid and triterpene, 2 - m - tridecyl phenyl) benzotriazole, 2, 2, bis-bis [4~ ~ (l,l,3,3-tetramethylbutyl)_6-(2h, mono-2-yl)phenol], methyl_3_[benzazole-butylene-5-(2h-benzo 17 201219817 Tris- 2 -yl)- 4-hydroxyphenyl]propionate condensate with polyethylene glycol, 2-(2-hydroxyphenyl)benzotriazole copolymer, 2 (2' —4, _ octyloxyphenyl) - 2H - stupid and trisal, 2- (2H - benzotriene. sit - 2 - base) - 4 - fluorenyl - 0 - (3, 4, 5, 6 - four Hydroquinone iminomethyl) phenol ' 2,2 monomethylene double (4 - Tert-butyl- 6_2H-benzotriazolylphenol), 2,2'-indenylenebis(4-trioctyl- 6-2H-benzotriazolyl). Commercially available products include the trade name "KEMISORB279"
(ChemiPro 公司製）、商品名「TINUVIN360」（BASF JAPAN 公司製）。 上述二笨曱酮系化合物之具體例可列舉2,4 —二羥二笨 基酮、2—羥—4 —甲氧二苯曱酮、2_羥_4_甲氧二苯曱 酮—5—磺酸、2—羥一4—正己氧基二苯甲酮、2_羥_4一 正十二烷氧基二苯曱酮、2 —羥一4 —苯甲氧基二苯甲酮、 雙（5 —笨曱醢基—4一羥一 2一甲氧苯基）甲烷、2,2，—二 起 4 甲氧一本曱嗣、2,2，一二經一 4，4，一二甲氧二苯 曱酮、2,2’ ，4,4， 一四羥二苯甲酮及2一羥_4—甲氧基_ 2 —羧基二笨曱酮等。市售品則可列舉商品名 「KEMISORB12」、商品名「KEMISORB1U」（皆為 Chemipro 公司製）、商品名「CHIMASS〇RB81」（BASF JApAN 公 司製）》 上述笨并三唑系化合物及二苯曱酮系化合物，較佳為 於300 C、20分鐘之加熱中，質量減少在丨〇%以下。3〇〇 C、20分鐘之加熱的質量減少，較佳在9%以下，更佳在8 %以下’再更佳在6%以下，特佳在5%以下。若3〇〇〇C、 18 201219817 20分鐘之加熱的質量減少超過上述上限，則有無法發揮充 分之紫外線吸收能力之虞。300t:、2〇分鐘之加熱的質量減 少在10%以下之紫外線吸收劑，較佳為可舉2,2，—亞甲武 雙[6— (2H —苯并三唑—2 —基）—4— (m3 —四甲基; 基）苯酚]。市售品則可列舉商品名r KEMISORB 1 2 · 、士 」 两 品名「KEMISORB111」（皆為Chemipro公司製）、商品名 「CHIMASSORB8 1」（BASF JAPAN 公司製）等。 上述三讲系化合物’例如可較佳使用具有1，3，5〜= 讲環之化合物。具體而言，可舉2— ( 4,6 —聯苯一1，3,5〜 三讲—2 一基）一 5—[(己基）氧基]—苯酚等。市售品例如 可舉商品名「TINUVIN1577」 （BASF JAPAN公司製）。 上述受阻胺系化合物，可列舉4 —經一 2,2,6,6 —四甲基 哌啶、1 —烯丙基_ 4~羥一 2,2,6,6—四甲基哌啶、1 ~苄基 —4一羥一 2,2,6,6 —四曱基哌啶、1— (4 —三級丁基一2 - 丁 烯基）一 4 —羥一 2,2,6,6 —四曱基哌啶、4 —硬脂醯氧基 (stearoyloxy ) —2,2,6,6 —四曱基旅咬、4—曱基丙稀醯氣 基（methacryloyloxy ) — 12,2,6,6 —五甲基略。定、i —苄基 ~~2,2,6,6 —四曱基一4~〇底咬基馬來酸酯、雙（2,2,6,6~四 曱基—4一哌啶基）琥珀酸酯、雙（1，2,2,6,6 —五曱基一4〜 0底咬基）琥珀酸g旨、雙（2,2,6,6 —四甲基一 4_°底°定基）己 二酸酯、雙（2,2,6,6 —四曱基_ 4一哌啶基）癸二酸酯、雙 (2,2,6,6-四曱基一4〜哌啶基）富馬酸酯（fumarate)、 雙（1，2,3,6 —四曱基~ 2,6 -二乙基一 4 一哌啶基）癸二酸酯、 雙（1一稀丙基一2,2,6,6 —二曱基一4 — 0底。定基）醜酸醋、雙 19 201219817 (1，2,2,6,6—五曱基一 4一哌啶基）癸二酸醋、’一（ ι，2 —乙烷二基（ethanediyl ))雙（3,3,5,5 —四曱基哌嗪酮 (tetramethylpiperazinone ) ) 、2 —甲基—2— (22 6,6— 甲基—4—哌啶基）亞胺基一N— (2,2,6,6—四甲基一4 —曱基—2— (1，2,2,6,6—五甲基一4 四 旅°定基）丙醯胺 娘咬基）亞胺基一 N— ( 1，2,2,6,6~五甲基_ 4一哌啶基）丙 醯胺、1_炔丙基一 4_卢一氰基乙氡基—2,2,6,6—四甲基哌 啶、1 —乙醯基一2,2,6,6—四曱基~~ 4_哌啶基_乙酸酯、苯 偏二酸（tnmelhtic acid )—參（2,2,6,6-四曱基一4-哌啶 基）酯、1一丙烯醯基一 4一苯曱氧基—2,2,6,6 —四甲基哌啶、 雙（1，2,2,6,6-五曱基-4-。底咬基）二丁基丙二酸醋、雙 (1，2,2,6,6—五甲基—4 —哌啶基）二苄基丙二酸酯、雙 (1’2’3’6 — E9曱基—2,6 —二乙基—4 — 口辰咬基）二节基—丙 二酸醋、雙U，2,2，M—五甲基—底。定基）—2— (3,5 一-—二級丁基一4 —經基爷某）—〇 泓丞卞丞，正丁基丙二酸酯、雙 (2,2,6,6—四甲基_4一〇底。定基、 卜 疋& ) 一 1，5 —二氧雜螺 (以〇乂381^0)[5.5]十一烷_3 3—一 μ μ ^ 一躞酸酯、雙（1，2,2,6,6 —五甲基一4 — 〇底哈美、—丨$ ，—氧雜螺[5·5]十一烷一3 3 -二叛酸醋1 (1—乙醯基2,2,6,6—四甲基—4一底咬基) 一 1，5_二氧雜螺[5.5]十一烷—3,3—二羧酸酯、υ—雙 [2,2 -[雙（2,2,6,6-四甲基-4— π辰咬基）—^卜二巧 環己烷（d10xacyclohexane ) — 5,5 —二羧酸酯]]、雙（2,2,6,6 羧酸酯]]' 1，2—雙[2,2，一[雙（2,2,6,6 一四甲基—4_哌啶基）_2—π_甲基乙基]—^3—二嘮環 己烷一 5,5 — 四 20 201219817 曱基_4—哌啶基）~'2—甲基-1，3_二嘮環己烷一5,5〜二 叛酸自曰]]、雙（2,2,6,6 —四甲基—4 — 〇底咬基）—2— [2— (3 5 _二三級丁基一 4-羥苯基）]乙基_2—甲基—ls3—二嘮環 己烷一5,5~~二羧酸酯、雙（2,6,6 —四曱基—4一哌啶基）〜 1，5_二氧雜螺[5.11]十七烷—3,3_二羧酸酯、己烷_1，，6, —雙一4 —胺甲醯氧基（carbamoyloxy ) — 1 —正丁基〜 2,2,6,6 —四甲基娘啶）、甲苯一 2’ ，4，_雙（4_胺甲醯氧 基一1 —正丁基一2,2,6,6 —四曱基哌啶）、二甲基—雙 (2,2,6,6 —四甲基哌啶一 4 —氧基）~矽烷、苯基—參 (2,2,6,6—四甲基哌啶一4 —氧基）一矽烷、參（1—丙基— 2，2,6,6 —四甲基一4 — 〇辰咬基）一亞填酸醋（phosphite)、 參（1 —丙基一 2,2,6,6 —四曱基一4一旅。定基）一磷酸酯 (phosphate)、苯基一[雙（1,2,2,6,6 —五甲基一4 —哌啶基）] 一填酸酯（phosphonate )、四（2,2,6,6—四曱基一4—派咬 基）1，2,3,4— 丁烧四叛酸醋（butanetetracarboxylate)、四 (1，2,2,6,6 —五曱基一4 —旅咬基）1，2,3,4_ 丁烧四羧酸醋、 四（2,2,6,6—四曱基一4—哌啶基）1，2,3,4— 丁烷四甲醢胺 (butanetetracarbonamide )、四（1，2,2,6,6 -五曱基一4— 哌啶基）1，2,3,4一 丁烷四甲醯胺、2 —二丁基胺基一 4,6 —雙 (9一氮雜（323)—3—乙基一8,8，10，10—四曱基一1，5-二 氧雜螺[5.5] —3--1--基曱氧基（undecylmethoxy ) ) — s -三决、2 -二丁基胺基一4,6-雙（9 -氮雜一3 -乙基一 8,8,9,10,1〇 —五甲基一1,5 —二氧雜螺[5.5] — 3 —十一基甲 氧基）一S —三碑、四（9.—氮雜一3—乙基一8,8,10,10 —四 21 201219817 甲基—1，5-二氧雜螺[5.5]—3—十一基甲基）—1，2 3 4_丁 烷四羧酸酯、四（9 —氮雜—3 —乙基—8,89，1〇1〇 —五甲基 _ 1，5—二氧雜螺[5·5]— 3—十一基曱基）_ 丁烷四 羧酸酯、十二基參（2,2,6,6·~四曱基_ 4一哌啶基）mi —丁烷四羧酸酯、十三基參（1，2,2,6,6—五甲基_4一哌啶 基）1，2,3,4 - 丁烧四缓酸酯、二（十三基）雙（2,2,6,6—四 曱基一4一哌啶基）1，2,3,4一 丁烷四羧酸酯、二（十三基） 雙（1’2,2,6,6—五曱基—4—哌啶基）丁烷四羧酸 酯、2,2,4,4一 四曱基一7—氧雜（〇xa) _3,2〇—二氮二螺 (diazadispiro) [5，1，11，2]二十一烷—21_ 酮、3 9—雙。」 一二甲基一 2— {參（2,2,6,6 —四曱基一4_哌啶氧基羰基 (piperidyloxycarbonyl) ) 丁基幾氧基丨乙基卜2,4,8，1〇_ 四氧雜螺[5.5]十一院、3，9 —雙[1，1 —二甲基一2 — {參 (1，2,2,6,6—五甲基一4〜哌啶氧基羰基）丁基羰氧基丨乙 基]—2,4,8，10—四氧雜螺[5.5]十一烷、聚（2,2,6,6—四甲基 —4 —哌啶基丙烯酸酯）、聚（1，2,2,6,6—五甲基一 4 一哌啶 基丙烯酸酯）、聚（2,2,6,6 —四甲基一4 —哌啶基曱基丙烯 酸酯）、聚（1，2,2,6,6—五甲基一 4 —派咬基曱基丙烯酸酯）、 聚[[雙（2,2,6,6 —四曱基一4 —哌啶基）衣康酸酯 (itaconate)][乙烯基丁基醚]]，聚[[雙（1,2,2,6,6-五曱基 —4—哌啶基）衣康酸酯Π乙烯基丁基醚]] '聚[[雙（2,2,6,6 —四甲基一 4_哌啶基）衣康酸酯][乙烯基辛基醚]]、聚[[雙 (1,2,2,6,6—五甲基一4 一旅咬基）衣康酸酯][乙烯基辛基 謎]]、二甲基玻珀酸酯一 2—（4_經一2,2,6,6—四甲基0底咬 22 201219817 基）乙醇縮合物、聚[六亞曱基[(2,2,6,6 —四甲基一 4 —哌 啶基）亞胺基]]、聚[乙烯[(2,2,6,6 —四曱基一 4_哌啶基） 亞胺基]六亞甲基[(2,2,6,6 —四亞甲基一4 —哌啶基）亞胺 基]]、聚[[1，3,5 -三讲一 2,4 -二基][(2,2,6,6 — 四甲基 一 4 —0底咬基）亞胺基]六亞曱基[(2,2,6,6 —四甲基一4 —派咬 基）亞胺基]]、聚[[6-(二乙基亞胺基）一1，3,5-三讲一 2.4 —二基][(2,2,6,6 —四曱基一4 -哌啶基）亞胺基]六亞甲 基[(2,2,6,6 —四曱基一4 —哌啶基）亞胺基]]、聚[[6 — [ ( 2 —乙基己S旨）亞胺基]—1，3,5 —三味一2,4 —二基][(2,2,6,6 —四曱基一 4一哌啶基）亞胺基]六亞曱基[(2,2,6,6—四甲 基一 4_哌啶基）亞胺基]]、聚[[6 — [( 1,1，3,3—四甲基丁基） 亞胺基]—1,3,5 -三讲一2,4-二基][(2,2,6,6 —四甲基一4 _哌啶基）亞胺基]六亞甲基[(2,2,6,6 —四甲基一 4_哌啶 基）亞胺基]]、聚[[6-(環己基亞胺基）一1，3,5-三讲一 2.4 —二基][(2,2,6,6_四甲基一4 —哌啶基）亞胺基]六亞甲 基[(2,2,6,6—四甲基一 4 —哌啶基）亞胺基]]、聚[[6—N —D末琳基（morpholino ) — 1，3,5 —三 π井一2,4 —二 基][(2,2,6,6 —四甲基一4 — 〇底0定基）亞胺基]六亞曱基 [(2,2,6,6_四甲基一 4 —哌啶基）亞胺基]]、聚[[6- ( 丁氧 基亞胺基）一1，3,5—三命一2,4 —二基][(2,2,6,6 —四甲基 —4一哌啶基）亞胺基]六亞甲基[(2,2,6,6 —四甲基一4一哌 啶基）亞胺基]]、聚[[6 — [ ( 1，1，3,3—四甲基丁基）氧基]— 1，3,5 —三讲一2,4一二基][(2,2,6,6 —四甲基一4 —哌啶基） 亞胺基]六亞甲基[(2,2,6,6 —四甲基一4一哌啶基）亞胺 23 201219817 基]]、聚[氧基[6 - [ ( 1 -哌啶基）一l，3,5 —三讲一2,4-二 基氧基（diyloxy) — 1，2 —乙烷二基][(2,2,6,6 — 四甲基一3 —側氧基（oxo) — 1,4 —哌啶基）一 1，2 — 乙烷二基]][(3,3,5,5 —四曱基一 2—側氧基一 1，4 —哌啶基）一 1，2_乙烷二基]]、 聚[氧基[6 - [( 1，1，3,3—四曱基丁基）亞胺基]—1，3,5—三 碑—2,4 —二基氧基一1，2 -乙烷二基][(2,2,6,6 -四甲基一 3 —側氧基一1,4 —哌啶基）一1，2—乙烷二基][(3,3,5,5—四 曱基一 2—側氧基一 1，4 —哌啶基）一l，2 —乙烷二基]]、聚[[6 —[(乙基乙醯基）亞胺基]—H5 —三。井一 2,4 —二 基][· ( 2,2,6,6 —四甲基一4 —哌啶基）亞胺基]六亞甲基 [(2,2,6,6 —四甲基一4 —哌啶基）亞胺基]]、聚[[6 — [( 2,2,6,6 -四甲基-4-哌啶基）丁基亞胺基]—ι，3,5-三碑一2,4-二基][(2,2,6,6 —四甲基一4_哌啶基）亞胺基]六亞甲基 [(2,2,6,6—四甲基一4 —哌啶基）亞胺基;)]、1，6，11_參[{ 4,6 -雙（N — 丁基一N— (2,2,6,6 —四甲基一4 —哌啶基）胺基） —1，3,5-三决一2-基}胺基]十一烷、1，6，11一參[{4,6_ 雙（N — 丁基一 N— ( 1，2,2,6,6 —五甲基一4 —哌啶基）胺基） —1，3,5 -三著一2-基}胺基]十一烷、ι，6，11-參[{4,6-雙（N—辛基一N— (2,2,6,6—四曱基一4—哌啶基）胺基） 一 1，3,5 -三决一2-基}胺基]十一烷、ι，6，11—參[{4,6-雙（N —辛基一N— ( 1，2,2,6,6—五甲基一4 —哌啶基）胺基） 一 1，3,5 —三讲一 2 —基}胺基]十一烷、聚曱基—丙基一 氧基[1 ( 2,2,6,6 —四甲基）哌啶基]矽氧烷、i，i’ ，1，，一 [1，3,5 -三斗一2,4,6-三基一參[(環己基亞胺基）—2，1一乙烷 24 201219817 二基]]-參[3,3,5,5 -四曱基哌井—2_酮]、I」」—參[聚氧 丙烯一{4,6_ 雙（Ν—丁基—Ν_ (2,2,6,6 一四甲基—4_ 哌啶基）胺基）一1，3,5 —三命―2 —基}胺基醚甲基]丙烷、 1，1，1—參[聚氧乙稀一{4,6—雙（Ν— 丁基一 Ν— (2,2,6,6 -四甲基一4-哌啶基）胺基）—H5—三讲—2_基}胺 基醚曱基]丙烷、1，1，1—參[聚氧乙烯—丨4,6_雙（1^一丁基 一 Ν— (1，2,2,6,6 —五曱基一 4 — 〇底啶基）胺基）—135_ 二讲一2-基}胺基醚甲基]丙烷、丨」」—參[聚氧丙烯一{4,6 雙（N — 丁基一N — ( 2,2,6,6 —四甲基—4—哌啶基）胺基） -1，3,5-三讲一2—基}胺基醚曱基]丙烷、—參[聚氧 丙烯一{4,6—雙（N—丁基一N— (1，2,2,6,6_ 五甲基—4 •'哌啶基）胺基）~1，3,5—三斗一2—基丨胺基醚甲基]丙 烷、1，5,8，12—四[4,6—雙（N— (2,2,6,6—四甲基一4—哌 啶基）一丁基胺基）一^5-三讲—2—基]—丨，^^—四. 氮雜十二烷、1，5,8，12 — 四[4,6 — 雙（N- ( 1，2,2,6,6—五曱 基~4—哌啶基）—丁基胺基）一1，3,5-三讲一2-基]— 15,8,12-四氮雜十二院等。 又，上述乙一酸苯胺系化合物例如有n，N, _二乙基乙 —馱一雙一苯胺、2_乙氧基_2’ —乙基乙二酸一雙—苯 胺、2—乙氧基一5 一三級丁基一2’ —乙基乙二酸—雙—苯 胺及2—乙氧基一 5一三級丁基_2，—乙基_4，_三級丁 基乙二酸一雙—笨胺等。市售品例如商品名「tinuvin3 12」 或商品名「TINUVIN315」（BASF JAPAN公司製）。 又，上述曱脒（formamidine )系紫外線吸收劑可舉出 25 201219817 有N~ ( 4—乙氧基羰基苯基）_N，—曱基—N，_苯基甲 脒、\一（4〜乙氧基羰基苯基）一 N，一乙基—N，一苯基 甲脒、N— (4—乙氧基羰基苯基）一 N，一乙氧基_N， 一 苯基甲脎及(4—乙氧基羰基苯基）一N，，N’ 一二苯 基甲脒等。 作為上述紫外線吸收劑之三D^化合物可舉出有2 _ [4,6 —二（2,4 —二曱苯基）_1，3,5—三命一2 —基]一 5 —辛 基氧苯酚，2〜（4,6 —聯苯一1,3,5 —三奇一2 —基）一5 — [(己基）氧]〜苯酚等。（C )成分之羥基苯曱酸酯系光安 定劑可使用2,4—二三級丁基苯基一3，，5，一二三級丁基 —4’ 一經基笨曱酸酯，2,6—二三級丁基苯基一3，，5，一 二三級丁基〜4，一羥基苯甲酸酯，正十六基-3,5_二三級 丁基一4—羥基苯甲酸酯及正十八基—3,5一二三級丁基_ 4 —羥基苯曱酸酯等。 再者’作為該紫外線吸收劑，較佳為使用兼具苯酚性 經基、與碳數4〜12之分枝狀烷基或碳數4〜12之直鏈狀 烧氧基的化合物。上述紫外線吸收劑之苯酚性羥基，由於 極性較高’因此，對於具有高極性酯基之上述耐熱性丙烯 酸樹脂的親和性較高。上述紫外線吸收劑之分枝狀烷基或 直鏈狀烷氧基’由於極性較低且含有適度長度之碳鏈，因 此’對於易於與該碳鏈相互作用之丙烯酸橡膠的親和性較 高。因此，上述紫外線吸收劑容易存在於耐熱性丙烯酸樹 脂與丙烯酸橡膠之界面。因此，上述紫外線吸收劑均勻地 分散於該保護片之基質中。結果，該保護片可發揮優異的 26 201219817 紫外線吸收能力。 又，上述紫外線吸收劑之熔點較佳為1HTC以上，更佳 為1201以±，再更佳$ 13(rca±。紫外線吸收劑之溶點 當未滿上述下限時’因為加工的關係於加熱熔融時揮發 y ’且在擠出出口等成形出口不易發生紫外線吸收劑析出 及凝集’ it而在片成形時之辦污不易產生，不會阻礙片的 透明性。 就上述紫外線吸收劑之含量而言，相對於基質相較佳 為0.5質量％以上10質量％以下，更佳為（質量％以上9 質量％以下’#更佳為2質量％以上8質量％以下。紫外 線吸收劑之含量若未滿上述下限，則所得之保護片有無法 充分吸收紫外線之虞。x，紫外線吸收劑之含量若超過上 述上限，則保護片之耐熱性有下降之虞。 <微粒子> 該保護片係、於基質相+含有微粒子。此微粒子之材質 較佳係使用二氧化⑪’其他亦可使用二氧化鈦、氧化銘、 氧化錯、碳酸#5、⑤嶺丨、滑石、燒成♦酸約、水和石夕酸 鈣、矽酸鋁、矽酸鎂、磷酸鈣等無機材質或交聯高分子等 有機材質。又，微粒子之材質可採用二氧化矽，因為會降 低保護片之霧度故較佳。又’由可縮小保護片之霧度之觀 點來看，較佳係採用二氧化矽之材質經有機物表面處理而 成之微粒子。用於此表面處理之有機物可舉出齒代矽烷 (hal〇Silane)類、炫氧石夕院類、石夕lL (silazane)、矽氧烷 等市售如可舉出例如商品名「syl〇ph〇bic」（富士 27 201219817 化學公司製）、「Aerosil200V」（曰本Aerosil公司製）、 「Aer〇SilR927V」（曰本Aerosil公司製）。該等可單獨或 或組合使用。 上述微粒子之平均粒徑較佳為〇.〇〇5以m以上2 # m以 下’更佳為0·05 # m以上1 # m以下。又，該微粒子係以從 保護片表面突出之方式配設，該微粒子之最大突出高度較 佳為0.01 " m以上0.1 " m以下，更佳為〇 〇2" m以上〇 〇5 // m以下。再者，微粒子係藉由於形成保護片時片進行延伸 (微延伸），如上述般微粒子從表面突出而設置。 上述微粒子之含量，相對於上述保護片，較佳為〇〇〇5 質量％以上！質量％以下’更佳為〇〇1質量％以上〇5質 量％以下’特佳為(M質量％以± 〇 3質量％以下。 另’上述微粒子不僅是在基質相中，亦可在分散相甲 含有上述微粒子。上述分散相中含有之微粒子和上述基質 =含有之微粒子可以是相同的材質、最大突出高度 合量。 <保護片> ，隸形成基質相之耐熱性㈣酸系樹脂、 丙烯酸系橡膠等混合物，例如加以擠出成 =伸：處’該保護片係藉由擠出後微延伸而成形ί Λ 1%,. . ς〇/ 孩礒延伸造成的延伸率 為以以上5%以下。為了實現該延伸率 牛 態中進行擠出忐拟.料 丨如會在以下狀 度，較擠出Απ * 风心之片進行拉伸的拉伸速 又較擠出成形時將㈣㈣擠 思 谓^迷度快0.3%。如 28 201219817 b易於藉由擠出後微延伸而在微粒子從保護片表面突出 之狀態下進行配設，並可提高保護片之易滑性。又，由於 係微延伸’故可維持保護片之透明性。 該保濩片之厚度較佳為1 5 μ m以上400〆m以下，更佳 為20"m以上300心以下’再更佳4〇"m以上2〇〇”以 下，特佳為40"m以± 15〇"m以下。藉由將保護片之厚度 定為上述圍，可賦予保護片充分之韌性，且可容易進行 保護片之捲回等使用性會提升。 使用該保6蒦片與偏光元件貼合而製成之偏光板的厚 度’較佳冑150y m以上刪μ m以下，更佳為⑺以 上700 " m以下，再更佳為200 " m以上600 " m以下。藉 由將偏光板之厚度定為上述範圍，可賦予保護片充分之韌 性，且可容易進行保護片之捲回等使用性會提升。 該保護片中，平面方向之延遲值（R〇較佳為—以 上15nm以下。又，厚度方向之延遲值（Rth)較佳為— 以上Onm以下。此處，上述平面方向之延遲值（尺㈠及厚 度方向之延遲值（Rth)分別以式（a)及（b)定義。(manufactured by ChemiPro), trade name "TINUVIN360" (manufactured by BASF JAPAN Co., Ltd.). Specific examples of the above-mentioned bicinchone-based compound include 2,4-dihydroxydiphenyl ketone, 2-hydroxy-4-methoxybenzophenone, and 2-hydroxy-4-methylbenzophenone- 5 - sulfonic acid, 2-hydroxy-4-non-hexyloxybenzophenone, 2-hydroxy-4-indolododecyloxydibenzophenone, 2-hydroxy-4-phenoxybenzophenone, Double (5 - awkward - 4 - hydroxy - 2 - methoxyphenyl) methane, 2, 2, - 2 from 4 methoxy oxime, 2, 2, 1 through 2, 4, 4, Dimethoxybenzophenone, 2,2', 4,4, tetrahydrobenzophenone, and 2-hydroxy-4-yl-2-carboxyl acetonone. Commercially available product name "KEMISORB12", trade name "KEMISORB1U" (all manufactured by Chemipro Co., Ltd.), and trade name "CHIMASS〇RB81" (manufactured by BASF JApAN Co., Ltd.) The above-mentioned stupid triazole compound and diphenyl hydrazine The ketone compound is preferably heated at 300 C for 20 minutes, and the mass is reduced to 丨〇% or less. 3 〇〇 C, the quality of heating for 20 minutes is reduced, preferably 9% or less, more preferably 8% or less, and still more preferably 6% or less, and particularly preferably 5% or less. If the mass of the heating of 20 〇〇〇C, 18 201219817 for 20 minutes exceeds the above upper limit, there is a possibility that the sufficient ultraviolet absorbing ability cannot be exhibited. 300t: UV absorber with a mass reduction of less than 10% for 2 minutes, preferably 2,2, - Methylene bismuth [6-(2H-benzotriazol-2-yl)- 4-(m3 - tetramethyl; phenyl) phenol]. Commercially available products include the trade name r KEMISORB 1 2 · , and the two names "KEMISORB111" (all manufactured by Chemipro) and the product name "CHIMASSORB8 1" (manufactured by BASF JAPAN Co., Ltd.). For the above-mentioned three-story compound, for example, a compound having 1,3,5~= ring can be preferably used. Specific examples thereof include 2-(4,6-biphenyl-1,3,5-tris--2-yl)-5-[(hexyl)oxy]-phenol. For example, the product name "TINUVIN 1577" (manufactured by BASF JAPAN Co., Ltd.) can be used. The hindered amine-based compound may, for example, be a 2,2,6,6-tetramethylpiperidine or 1-allyl-4~hydroxy-2,2,6,6-tetramethylpiperidine. 1-Benzyl-4-hydroxy- 2,2,6,6-tetradecylpiperidine, 1-(4-tributylbut-2-butenyl)-4-hydroxy-2,2,6, 6 - tetramethylpiperidine, 4 -stearoyloxy - 2,2,6,6 - tetradecyl brigade, 4-methacryloyloxy - 12,2, 6,6 - pentamethyl slightly. D, i - benzyl ~ ~ 2, 2, 6, 6 - tetradecyl - 4 ~ 〇 咬 base maleate, bis (2, 2, 6, 6 ~ tetradecyl - 4 piperidinyl Succinate, bis(1,2,2,6,6-pentamethyl- 4~0 base bite) succinic acid g, double (2,2,6,6-tetramethyl- 4_ bottom °定定) adipate, bis(2,2,6,6-tetradecyl-4-pyridinyl)sebacate, bis(2,2,6,6-tetradecyl- 4~peri Pyridyl fumarate, bis(1,2,3,6-tetradecyl~ 2,6-diethyl-tetra-piperidinyl) sebacate, double (1 propylene Base one 2,2,6,6-dimercapto- 4- 4- bottom. Fixed base) Ugly vinegar, double 19 201219817 (1,2,2,6,6-pentamethyl- 4 piperidinyl)癸Diacid vinegar, 'i(ι,2-ethanediyl) bis(3,3,5,5-tetramethylpiperazinone), 2-methyl-2-(22 6 ,6-methyl-4-piperidinyl)imide-N-(2,2,6,6-tetramethyl-4-indolyl-2-(1,2,2,6,6-five Methyl one 4 four brigade ° basal) acetaminophen nitrile) imine-N-( 1,2,2,6,6-pentamethyl-4-pyridinyl)propanamide, 1_ Propyl- 4_lu-cyanoethenyl- 2,2,6,6-tetramethylpiperidine, 1-ethenyl- 2,2,6,6-tetradecyl~~4_piperidine -Acetyl ester, tnmelhtic acid - ginseng (2,2,6,6-tetradecyl-4-piperidinyl) ester, 1-propenyl fluorenyl-4-tetraphenyloxyl group - 2,2,6,6-tetramethylpiperidine, bis(1,2,2,6,6-pentamethyl-4-indenyl)dibutylmalonate, double (1,2 , 2,6,6-pentamethyl-4-pyridinyl)dibenzylmalonate, bis(1'2'3'6-E9-mercapto-2,6-diethyl- 4-) Chen bite base) two base - malonic acid vinegar, double U, 2, 2, M - pentamethyl - bottom. Fixed base)—2—(3,5---secondary butyl- 4—by kee)—〇泓丞卞丞, n-butylmalonate, bis (2,2,6,6—four Methyl _4 - 〇 。. 定 定, 疋 疋 & ) a 1,5 - dioxaspiro (to 〇乂 381 ^ 0) [5.5] undecane _3 3 - a μ μ ^ monodecanoate , double (1,2,2,6,6-pentamethyl- 4 - 〇底哈美, -丨$,-oxaspiro[5·5]undecane-3 3 -di-rebel vinegar 1 ( 1-Ethyl 2,2,6,6-tetramethyl-4, a base bite) 1,5-dioxaspiro[5.5]undecane-3,3-dicarboxylate, hydrazine- Bis [2,2 -[bis(2,2,6,6-tetramethyl-4- π chen)-^b dicyclohexylcyclohexane (d10xacyclohexane) — 5,5-dicarboxylate]] , bis(2,2,6,6-carboxylate]]' 1,2-bis[2,2,-[bis(2,2,6,6-tetramethyl-4-piperidinyl)_2- π_Methylethyl]-^3-dioxane cyclohexane-5,5-4,20 20 201219817 fluorenyl-4-piperidinyl)~'2-methyl-1,3-dioxacyclohexane 5,5~2 retinoic acid self-producing]], double (2,2,6,6-tetramethyl- 4 - 〇 base bite) - 2 - [2 - (3 5 _ 2 3 butyl 4 -hydroxyphenyl)]ethyl-2-methyl-ls3 - Di-cyclohexane- 5,5-~dicarboxylate, bis(2,6,6-tetradecyl-4-piperidinyl)~ 1,5-dioxaspiro[5.11]heptadecane —3,3_dicarboxylate, hexane_1,6, —bis- 4-aminocarbamoyloxy — 1 —n-butyl~2,2,6,6 —tetramethylnidate Acridine), toluene-2', 4, bis (4-aminomethyloxyl-1-n-butyl-2,2,6,6-tetradecylpiperidine), dimethyl-bis (2, 2,6,6-tetramethylpiperidine-4-oxo)~nonane, phenyl-parade (2,2,6,6-tetramethylpiperidine-4-oxo)-decane, ginseng (1 -propyl - 2,2,6,6 -tetramethyl- 4 - 〇辰 bite) ylide yttrium (phosphite), ginseng (1-propyl-2,2,6,6-tetradecyl) a 4-1 brigade. Dingji) phosphate, phenyl-[bis(1,2,2,6,6-pentamethyl-tetra-piperidinyl)] phosphonate, four (2,2,6,6-tetradecyl-4--bite base) 1,2,3,4-butadiene tetraacetate (butanetetracarboxylate), four (1,2,2,6,6-5曱基一4—Big bite base) 1,2,3,4_ diced tetracarboxylic acid vinegar, four (2,2,6,6-tetradecyl- 4- Iridinyl) 1,2,3,4-butanetetracarbamide, tetrakis(1,2,2,6,6-pentamethylene-4-piperidinyl) 1,2,3,4 Monobutane tetramethyleneamine, 2-dibutylamino- 4,6-bis(9-aza(323)-3-ethyl-8,8,10,10-tetradecyl-1,5 -Dioxaspiro[5.5]-3--1--yloxy (undecylmethoxy)) — s -triploid, 2 -dibutylamino- 4,6-bis(9-aza- 3 - Ethyl-8,8,9,10,1〇-pentamethyl-1,5-dioxaspiro[5.5]-3-epynylmethoxy)-S-Sanbei, IV (9. Aza-3-ethyl-8,8,10,10-four 21 201219817 methyl-1,5-dioxaspiro[5.5]-3-31-methyl)-1,2 3 4_ Alkane tetracarboxylate, tetrakis(9-aza-3-ethyl-8,89,1〇1〇-pentamethyl-1,5-dioxaspiro[5·5]-3-31 Mercapto)butane tetracarboxylate, dodecyl ginseng (2,2,6,6·~tetradecyl-4-pyridinyl)mi-butane tetracarboxylate, thirteen-based ginseng , 2,2,6,6-pentamethyl_4-piperidinyl) 1,2,3,4 - butyl sulphate, bis(trisyl) bis (2,2,6,6- Four base 4-piperidinyl) 1,2,3,4-butane tetracarboxylate, bis(tridecyl)bis(1'2,2,6,6-pentamethyl-4-piperidinyl) Alkane tetracarboxylate, 2,2,4,4-tetradecyl-7-oxa(〇xa) _3,2〇-diazadispiro [5,1,11,2] twenty-one Alkane-21-ketone, 39-double. Monomethyl 2-({2,2,6,6-tetradecyl-4-piperidineoxycarbonyl) butyl methoxy oxime ethyl 2,4,8,1 〇_ Tetraoxaspiro[5.5] Eleven, 3,9-bis[1,1-dimethyl- 2 - { ginseng (1,2,2,6,6-pentamethyl- 4~piperidine) Oxycarbonylcarbonyl)butylcarbonyloxyindoleethyl]-2,4,8,10-tetraoxaspiro[5.5]undecane, poly(2,2,6,6-tetramethyl-4-piper Pyridyl acrylate), poly(1,2,2,6,6-pentamethyl-tetra-piperidinyl acrylate), poly(2,2,6,6-tetramethyl-4-piperidinyl) Mercapto acrylate), poly(1,2,2,6,6-pentamethyl- 4-glycolyl methacrylate), poly[[double (2,2,6,6-tetradecyl) 4-piperidinyl)itaconate][vinylbutylether]], poly[[bis(1,2,2,6,6-pentamethyl-4-piperidinyl)-concord) Ester oxime vinyl butyl ether]] 'poly[[bis(2,2,6,6-tetramethyl-4-piperidinyl)itaconate][vinyl octyl ether]], poly[ [Double (1,2,2,6,6-pentamethyl- 4 a brigade bite) itaconate][vinyl octyl]], dimethyl borolate 2-(4 _ by a 2,2,6,6-tetramethyl 0 bottom bite 22 201219817 base) ethanol condensate, poly [hexamethylene sulfhydryl [(2,2,6,6-tetramethyl-4-cyclopiperidinyl) Imino]], poly[ethylene [(2,2,6,6-tetradecyl-4-piperidyl)imido]hexamethylene[[2,2,6,6-tetra Methyl 4-(piperidinyl)imido]], poly[[1,3,5-tris-one 2,4-diyl][(2,2,6,6-tetramethyl- 4 — 0 bottom base) imino] hexamethylene [[2,2,6,6-tetramethyl-4-cyano)imine]], poly[[6-(diethylimine) Base)-1,3,5-three-one-2.4-diyl][(2,2,6,6-tetradecyl-4-piperidinyl)imido]hexamethylene[2,2 ,6,6-tetradecyl-4-piperidinyl)imido]], poly[[6-[(2-ethylhexyl)imino]-1,3,5-three-flavor-2 ,4-diyl][(2,2,6,6-tetradecyl-tetra-piperidinyl)imido]hexamethylene[[2,2,6,6-tetramethyl-4_ Piperidinyl)imido]], poly[[6 —[( 1,1,3,3-tetramethylbutyl)imido]-1,3,5 -3,1,2,4-di ]][(2,2,6,6-tetramethyl-4-piperidinyl)imido]hexamethylene[[2,2,6,6-tetramethyl-4_ Iridyl)imido]], poly[[6-(cyclohexylimido)-1,3,5-tris-2.4-diyl][(2,2,6,6-tetramethyl- 4-piperidinyl)imido]hexamethylene[(2,2,6,6-tetramethyl-4-piperidinyl)imido]], poly[[6-N-D Morpholin — 1,3,5 —three π wells, 2,4 —diyl][(2,2,6,6 —tetramethyl- 4 — fluorene base] imine] hexammine [[2,2,6,6-tetramethyl-4-cyclopiperidyl)imido]], poly[[6-(butoxyimino)-1,3,5-three-one 2,4-diyl][(2,2,6,6-tetramethyl-4-pyridinyl)imido]hexamethylene[[2,2,6,6-tetramethyl-4 1-piperidinyl)imido]], poly[[6 —[(1,3,3,3-tetramethylbutyl)oxy]-1,3,5—three to one, two, four one ]][(2,2,6,6-tetramethyl-4-piperidinyl)imido]hexamethylene[(2,2,6,6-tetramethyl-tetra-piperidinyl) Imine 23 201219817 base]], poly[oxy[6-[(1-piperidinyl)-l,3,5-tris- 2,4-diyloxy), 1,2-B Alkyldiyl][(2,2,6,6-tetramethyl-3-oxo-oxo(oxo)-1,4-piperidin Iridinyl)-1,2-ethanediyl]][(3,3,5,5-tetradecyl-2-ylidene-1,4-piperidinyl)- 1,2-ethane Base]], poly[oxy[6-[(1,3,3-tetradecylbutyl)imido]-1,3,5-three-tele- 2,4-diyloxy- 1,2-ethanediyl][(2,2,6,6-tetramethyl-3-o-oxy-1,4-piperidinyl)- 1,2-ethanediyl][(3 ,3,5,5-tetradecyl- 2-sideoxy-1,4-piperidinyl)-l,2-ethanediyl]], poly[[6-[(ethylethenyl)) Imino] - H5 - three. Well-2,4-diyl][·(2,2,6,6-tetramethyl-4-piperidinyl)imido]hexamethylene[[2,2,6,6—four A 4-[piperidinyl)imido]], poly[[6-[(2,2,6,6-tetramethyl-4-piperidyl)butylimino]-, 3, 5-Sanbei-2,4-diyl][(2,2,6,6-tetramethyl-4-piperidinyl)imido]hexamethylene[[2,2,6,6- Tetramethyl-4-piperidyl)imine;)], 1,6,11-parametric [{ 4,6-bis(N-butyl-N-(2,2,6,6-tetramethyl) Benzyl 4-piperidinyl)amino)-1,3,5-triazine-2-yl}amino]undecane, 1,6,11-parade [{4,6_bis(N-butyl) N-(1,2,2,6,6-pentamethyl-tetra-piperidinyl)amino)-1,3,5-tri-a 2-yl}amino]undecane, ι, 6,11-Fin [{4,6-bis(N-octyl-N-(2,2,6,6-tetradecyl-4-piperidyl)amine)-1,3,5-three 2-2-yl}amino]undecane, ι,6,11-parameter [{4,6-bis(N-octyl-N-(1,2,2,6,6-pentamethyl-) 4-piperidinyl)amino)-1,3,5-trisyl-2-yl}amino]undecane, polydecyl-propyl-oxyl[1 ( 2,2,6,6 — four Methyl)piperidinyl]oxane, i,i',1,-[1,3,5-tricyclic-2,4,6-triyl-one-[[cyclohexylimine]-2 ,1 ethane 24 201219817 diyl]]-parade [3,3,5,5-tetradecylpiperazine- 2 ketone], I""-parameter [polyoxypropylene-{4,6_ double (Ν —butyl-Ν_(2,2,6,6-tetramethyl-4_piperidinyl)amino)-1,3,5-tris- 2-yl}aminoether methyl]propane, 1, 1,1—parade [polyoxyethylene 1 {6,6-bis(Ν-butyl-indenyl-(2,2,6,6-tetramethyl-4-piperidyl)amino)-H5— Three lectures - 2_yl}aminoether fluorenyl]propane, 1,1,1-parade [polyoxyethylene-丨4,6_double (1^-butyl-anthracene - (1,2,2,6 ,6-pentamethylene- 4-endridinyl)amino)-135_two-one 2-yl}amino ether methyl]propane, hydrazine"-parameter [polyoxypropylene-{4,6 double ( N — butyl-N — ( 2,2,6,6-tetramethyl-4-piperidinyl)amino)-1,3,5-tris- 2-yl}aminoetherinyl]propane , - ginseng [polyoxypropylene-{4,6-bis(N-butyl-N-(1,2,2,6,6-pentamethyl-4)-piperidyl)amino)~1,3 ,5-Sandouyi-2-carbylamine Ether methyl]propane, 1,5,8,12-tetra[4,6-bis(N-(2,2,6,6-tetramethyl-4-piperidyl)-butylamino) ^5-三讲—2—基]—丨,^^—四. Azadodecane, 1,5,8,12 — four [4,6 — double (N- ( 1,2,2,6 , 6-pentamethyl~4-piperidinyl)-butylamino)-1,3,5-tris-one-2-yl]- 15,8,12-tetraaza-12. Further, the above-mentioned ethyl aniline-based compound is, for example, n,N,diethylethyl-indole-diphenylaniline, 2-ethoxylated 2'-ethyl oxalic acid mono-aniline, 2-ethoxy group 5-5-tert-butyl- 2'-ethyl oxalic acid-bis-aniline and 2-ethoxy-5,3-tert-butyl-2,-ethyl_4,_tertiary butyl oxalic acid A pair of stupid amines. The commercial item is, for example, the product name "tinuvin3 12" or the product name "TINUVIN315" (manufactured by BASF JAPAN Co., Ltd.). Further, the above-mentioned formidine-based ultraviolet absorber may be exemplified by 25 201219817 having N~(4-ethoxycarbonylphenyl)_N,-fluorenyl-N,_phenylformamidine, \1 (4 to B) Oxycarbonyl phenyl)-N, monoethyl-N, monophenylformamidine, N-(4-ethoxycarbonylphenyl)-N, monoethoxy-N, monophenylformamidine and 4-ethoxycarbonylphenyl)-N,, N'-diphenylformamidine, and the like. The tri-D compound as the above ultraviolet absorbing agent may be exemplified by 2 _[4,6-di(2,4-diphenylene)_1,3,5-tris-one-2-yl]-5-octyl Oxyphenol, 2~(4,6-biphenyl-1,3,5-triosyl-2-yl)-5-[(hexyl)oxy]~phenol and the like. The hydroxybenzoate-based light stabilizer of the component (C) can be used as a 2,4-di-tert-butylphenyl-3,5,2-di-tert-butyl- 4'-peracetic acid ester, 2 , 6-di-tert-butyl phenyl- 3,5,-di-tri-butyl- 4,monohydroxybenzoate, n-hexadecyl-3,5-di-tert-butyl- 4-hydroxyl Benzoic acid ester and n-octadecyl-3,5-diethylene butyl 4-hydroxybenzoate. Further, as the ultraviolet absorber, a compound having a phenolic radical, a branched alkyl group having 4 to 12 carbon atoms or a linear alkoxy group having 4 to 12 carbon atoms is preferably used. Since the phenolic hydroxyl group of the ultraviolet absorber has a high polarity, the affinity for the heat-resistant acryl resin having a highly polar ester group is high. The branched alkyl group or the linear alkoxy group of the above ultraviolet absorber has a low polarity and contains a carbon chain of a moderate length, and therefore has a high affinity for an acrylic rubber which is liable to interact with the carbon chain. Therefore, the above ultraviolet absorbent is easily present at the interface between the heat resistant acrylic resin and the acrylic rubber. Therefore, the above ultraviolet absorbent is uniformly dispersed in the matrix of the protective sheet. As a result, the protective sheet can exhibit excellent ultraviolet absorbing ability of 26 201219817. Further, the melting point of the ultraviolet absorber is preferably 1 HTC or more, more preferably 1201 to ±, and even more preferably 13 13 (rca ±. When the melting point of the ultraviolet absorber is less than the lower limit), the processing is related to heating and melting. In the case of volatilization y', it is less likely to cause ultraviolet absorber precipitation and aggregation at the forming outlet such as the extrusion outlet, and it is less likely to occur during sheet forming, and does not hinder the transparency of the sheet. It is preferably 0.5% by mass or more and 10% by mass or less based on the matrix phase, more preferably (% by mass or more and 9% by mass or less of '% more preferably 2% by mass or more and 8% by mass or less. If the content of the ultraviolet absorber is less than When the content of the ultraviolet absorbing agent exceeds the above upper limit, the heat resistance of the protective sheet is lowered. When the content of the ultraviolet absorbing agent exceeds the above upper limit, the heat resistance of the protective sheet is lowered. <Microparticles> The matrix phase + contains fine particles. The material of the microparticles is preferably made of dioxide 11'. Others may also use titanium dioxide, oxidized smelting, oxidizing, carbonic acid #5, 5 ling, talc, firing. ♦ Organic materials such as acid, water, calcium oxalate, aluminum citrate, magnesium citrate, calcium phosphate, etc., or cross-linked polymers, etc. Also, the material of the fine particles may be cerium oxide, because the protective sheet is lowered. The haze is better. In addition, from the viewpoint of reducing the haze of the protective sheet, it is preferable to use a material obtained by treating the surface of the organic material with cerium oxide. The organic substance used for the surface treatment may be a tooth. For example, the product name "syl〇ph〇bic" (Fuji 27 201219817 Chemical Co., Ltd.) is commercially available, for example, in the case of sulphate, sulphate, sulphate, sulphate, and sulphate. "Aerosil 200V" (manufactured by Acer Silicone Co., Ltd.) and "Aer〇SilR927V" (manufactured by Acer Silicon Co., Ltd.). These may be used singly or in combination. The average particle diameter of the above fine particles is preferably 〇. m or more 2 #m以下' is more preferably 0·05 #m以上1#m以下。 Further, the fine particles are disposed so as to protrude from the surface of the protective sheet, and the maximum protruding height of the fine particles is preferably 0.01 " m Above 0.1 " m, better 〇〇2&quo t; m is not more than 5 // m. Further, the microparticles are extended (micro-extended) by forming a protective sheet, and the microparticles are protruded from the surface as described above. The content of the microparticles is relative to the above protection. The sheet is preferably 5% by mass or more, and the mass% or less is more preferably 〇〇1% by mass or more 〇 5% by mass or less. (M-% by mass is ± 〇 3% by mass or less. The microparticles may be contained not only in the matrix phase but also in the dispersed phase A. The microparticles contained in the dispersed phase and the matrix-containing microparticles may be the same material and the maximum protrusion height. <Protective sheet>, which forms a mixture of heat resistance of the matrix phase (4) acid resin, acrylic rubber, etc., for example, extruded into = stretch: where the protective sheet is formed by micro-stretching after extrusion 1%, . . ς〇/ The elongation of the child is less than 5%. In order to achieve the elongation, the extrusion is simulated in the bovine state. For example, in the following state, the stretching speed of the sheet which is stretched compared with the sheet of the extruded Α π * Fengxin is (4) (four) ^ The fan is 0.3% faster. For example, 28 201219817 b can be easily disposed in a state in which fine particles protrude from the surface of the protective sheet by micro-extension after extrusion, and the slipperiness of the protective sheet can be improved. Further, the transparency of the protective sheet can be maintained because of the micro extension. The thickness of the protective sheet is preferably 15 μm or more and 400 μm or less, more preferably 20 "m or more and 300 hearts or less; and even more preferably 4〇"m or more 2〇〇" or less, particularly preferably 40" m is not more than ±15 〇" m. By setting the thickness of the protective sheet to the above-mentioned circumference, it is possible to impart sufficient toughness to the protective sheet, and it is easy to improve the usability such as retraction of the protective sheet. The thickness of the polarizing plate prepared by laminating the sheet and the polarizing element is preferably 胄150 μm or more and μ μm or less, more preferably (7) or more and 700 " m or less, and even more preferably 200 " m or more; 600 " m By setting the thickness of the polarizing plate to the above range, it is possible to impart sufficient toughness to the protective sheet, and it is easy to improve the usability such as retraction of the protective sheet. In the protective sheet, the retardation value in the plane direction (R〇) Preferably, the retardation value (Rth) in the thickness direction is preferably - more than or equal to Onm. Here, the retardation value in the plane direction (the ruler (1) and the retardation value (Rth) in the thickness direction are respectively Definitions (a) and (b).
Rel = ( nxl - nyl ) xd[nm] ( a)Rel = ( nxl - nyl ) xd[nm] ( a)
Rthl — {(nxl + nyl)/2—nzl}xd[nm] (b) 此處’ nxl為保護片之平面方向之主折射率。η"為與 nxl正交之方向的折射率。nzl為保護片之厚度方向的主折 射率。d為保護片之厚度。 <偏光板> 該保護片可用作偏光板保護片。具體而言，如圖丨所 29 201219817 示可藉由對上述保護片1、與介於該一對保護片1之間 的板狀偏光元件2來構成偏光板。上述保護片1與偏光元 件2，可藉由水性糊等接著劑（省略圖式）來進行貼附。 <液晶顯示元件> 具備上述保護片1之偏光板，可用於液晶顯示裝置。 具體而。如圖2戶斤示，可由液晶面板、以及分別貼附於 該液晶面板3之兩面的一對上述偏光板來構成液晶顯示元 件。上述偏光板與液晶面板3，可藉由紫外線效果型接著劑 等接著劑4來進行貼附。 <其他實施形態> 另，本發明並不限定於上述實施形態，可做各種的設 。十變更，可於忒保護片的單面或兩面施以消光加工。藉此 能發揮易於將施有消光加工之面經由接著劑等貼附於其他 部材之效果。圖3之偏光板中，於一對保護片丨之各個單 面形成有消光層5。而於此一對保護片i之消光層5之間配 設有偏光it件2’消光層5與偏光元件2係由水系接著劑（省 :圖式）1占著。此消光層5可使用消光劑來形成，具體而 言，可將含消光劑之塗佈液塗佈於保護片i之單面來形成 消光層5。另，消光劑可使用有機或無機之微小粒子，例^， 二氧化矽、滑石、碳酸鈣、沉降性硫酸鋇、氧化鋁、酸性 白土、黏土 '碳酸錢、碳黑、氧化锡、欽白（出繼心㈨、 尿素粉末樹脂等。 又，如圖3所示，亦可採用在該保護片之單面積層有 硬塗層6之構成。圖3之偏光板方面，於—對保護片】之 30 201219817 一’該保護片1之未與偏光元件2相對那一側的面積層有 硬塗層6。藉此’可提高該保護片1之耐擦傷性。又，上述 硬塗層6係由塗佈丙烯酸系塗料所形成。藉此亦可確保硬 塗層6之透明性，可維持保護片1之透明性。 [實施例1] 以下，基於本發明實施例具體說明’本發明並不限定 於該等實施例。 <耐熱性丙烯酸系樹脂之製造> [合成例1] (耐熱性丙烯酸系樹脂（A — 1 ): (甲基丙稀酸曱醋一苯乙稀一甲基丙稀酸一主鏈6員 環内酯）之合成） 調製由以下成分所構成之混合液：作為單體之甲基内 烯酉文甲S曰35質莖伤、本乙烯25質量份、〇；—經曱基丙歸 酸曱6曰15質量份及甲基丙稀酸8質量份、作為聚合反應溶 劑之間一曱苯20質量份，作為聚合起始劑之日本油脂公司 製「PERHEXA C」（1，1一二（三級丁基過氧）環己烷）5〇 質量ppm、以及作為分子量調節劑之正辛硫醇ι5〇〇質量 ppm。將此混合液以1.5L/hr之進料速度連續供給至内容 量3L之附夾套（jacket)之完全混合反應器，以125。〇之溫 度進行聚合反應。將來自上述反應器之聚合反應液再連續 地供給至設定成260°C溫度且滯留時間2小時之高溫脫氣骏 置’藉此進行從鍵結於共聚物主鏈之經曱基與甲氧基幾式 脫水之反應即主鏈6員環内酯的生成反應及未反應物之除 31 201219817 去。其後，藉由進行處理獲得耐熱性㈣㈣樹脂（a_小 針對此耐熱性丙烯酸系樹脂（α—D，進行中和滴定、IR 光譜、及Uc—NMR之分析的結果，來自甲基丙烯酸甲酉旨之 結構單位 '來自苯乙稀之結構單位、主鍵6員環内醋含有 結構單位、及來自甲基丙烯酸之結構單位之各個含有率為 45質量％’30質量％’18質量％及7質量％。又对熱性 丙稀酸系樹脂（A— 1)之溶融流動率値（astm_di238 ; 230 C ’ 3.8kg荷重）為i.ig/10分，玻璃轉移溫度（ 為135 °C，折射率為1.528。 [合成例2] (耐熱性丙烯酸系樹脂（A — 2 ): (甲基丙烯酸曱酯一α —甲笨乙烯—曱基丙烯酸—主 鏈6員環内酯）之合成） 製備由以下成分構成的混合液：作為單體之曱基丙稀 酸甲酯48質量份、α —甲苯乙烯6質量份、〇_羥基曱基 丙稀酸曱酯8質量份及曱基丙烯酸5質量份，作為聚合反 應溶劑之三級丁醇40質量份，作為聚合起始劑之Ul —二 (三級丁基過氧基）一3,3,5 -三曱基環己烷5〇〇質量ppm， 以及作為分子量s周師劑之正辛硫酵200質量ppm。以1 5L / hr之供給速度，將該混合液連續供給至内容量3L的附炎 套完全混合反應器’於125C之溫度進行聚合反應。將出自 上述反應器之聚合反應液，進一步連續供給至設定為260 °C溫度之滯留時間2小時的高溫脫氣裝置，藉此進行主鏈6 員環内酯生成反應及未反應物之除去。其後，藉由該處理 32 201219817 獲得耐熱性丙烯酸系樹脂（A — 2 )。對該耐熱性丙烯酸系 樹脂（A — 2 )進行中和滴定、1R光譜、及13C — NMR之分 析的結果，來自甲基丙烯酸曱酯之結構單位、來自α _甲 苯乙烯之結構單位、含有主鏈6員環内酯之結構單位、及 來自甲基丙烯酸之結構單位的含有率分別為80質量％、11 質量％、6質量％及3質量％。又，耐熱性丙烯酸系樹脂（Α 一 2)之熔融流動速率值（ASTM — D1238 ; 23(TC、3.8kg荷 重）為1.5g/10分’玻璃轉移溫度（Tg)為132。(：，折射 率為1.504。 <丙烯酸系橡膠之製造> [合成例3] (三層結構之丙烯酸系橡膠微粒子） 將離子交換水300質量份裝入附攪拌機之反應容器， 一邊進行氮取代，一邊升溫至川它後，添加二己基磺基琥 珀酸鈉0.3質量份、過硫酸鉀〇 3質量份。接著加入由作為 單體之甲基丙烯酸甲酯23質量份、正丙烯酸—正丁酯2質 量份、及甲基丙稀酸稀丙g旨G.G3質量份所構成之混合物， 保持1小時以使聚合反應完成。接著再以2小時添加由作 為單體之丙烯酸正丁醋22質量份、苯乙烯28質量份、及 甲基丙稀酸稀丙醋K0質量份所構成之混合物之後，保持2 小時以使反應完成。並且.，再以丨小時添加由作為單體之 甲基丙烯酸甲醋22質量份及丙稀酸正丁醋3質量份、以及 乍為刀子里調郎劑之正辛硫醇質量份所構成之單體混 °物之後’保持1小時以使得反應完成。將所得之乳膠 33 201219817 (latex )，使用硫酸鈉作為鹽析劑進行鹽析之後、脫水、 水洗、脫水及乾燥，獲得粉體形態之丙烯酸系橡膠（b_ ^。 所得之丙稀酸系橡膠微粒子（Β_υ之粒徑& 45_，又， 折射率為1.5 19。 [合成例4] (二層結構之丙烯酸系橡膠微粒子之合成） 將離子交換水300質量份加入附攪拌機之反應容器， 一邊進行氮置換一邊升溫至70〇C後，加入磺琥珀酸鈉二己 酯〇.3質量份、過硫酸鉀〇·3質量份。接著，花2小時添加 由作為單體之丙烯酸正丁酯24質量份、苯乙烯28質量份、 及曱基丙烯酸烯丙酯2.0質量份所構成的混合物後，保持2 小時而結束反應。接著，花1小時添加由作為單體之甲基 丙烯酸甲酯45質量份與丙烯酸正丁酯3質量份、及作為分 子量調節劑之正辛硫醇〇.05質量份所構成的混合物後，保 持1小時而結束反應。使用硫酸鈉作為鹽析劑，對所得之 膠乳進行鹽析後，進行脫水、水洗、脫水、及乾燥，獲得 粉體狀之二層結構之丙烯酸系橡膠微粒子（B _ 2 )。所得 丙烯酸系橡膠微粒子（B _ 2 )之粒徑為49nm，折射率為 1.518 » <保護片之製造> [實施例1 ] 將上述合成例中獲得之耐熱性丙烯酸系樹脂（A — 1 ) 45質量份、（a—2) 15重量部、丙烯酸系橡膠微粒子（B —1 ) 20質量份、與（b — 2 ) 20質量份加以乾摻後，使用 34 201219817 裝有τ字模之擠出機，一邊調整螺旋旋轉數、擠出機之圓 筒内樹脂溫度、τ字模之溫度，一邊進行擠出成形，藉此獲 付實施例！之保護片。該實施例i之保護片的表面粗糙度 Ra為0.04〜〇_〇5"m’其霧值為。表面 粗糙度係依據JIS— b_ 0601 — 2〇〇1而測得之切斷值入 c2.5mm、評價長度12 5mm的算術平均粗糙度。 [實施例2及3] 實施例1中，按下述表丨所載設定耐熱性丙烯酸系樹 脂及丙烯酸系橡膠之種類及摻合比，除此之外以與實施 例1同樣的方式獲得實施例2及3之保護片。該實施例2 之保護片的表面粗糙度！^為〇 〇3〜〇 〇4以m，其霧值為〇 7 %。又’實施例3之保護片的表面粗糙度為〇.〇 1〜〇.〇2 M m，其霧值為0.6%。 [比較例1〜3] 實施例1中，使用一次平均粒徑為〇 5 A m以上之丙烯 酸系橡膠（b— 1)作為丙烯酸系橡膠，並按下述表1所載 設定耐熱性丙烯酸系樹脂之種類與摻合量、及丙烯酸系橡 膠（b — 1 )之摻合量’除此之外，以與實施例1同樣的方 式獲得比較例1〜3之保護片。比較例1之保護片的表面粗 糙度為Ra為3.5 其霧值為8.5%。又，比較例2之保 護片的表面粗糙度Ra為2.5/zm，其霧值為6.5%。再者， 比較例3之保護片的表面粗糙度（Ra )為1 5 # m，其霧值 為 5.2%。 <評價> 35 201219817 對以上製得之保護片進行下述評價。將評價結果示於 下述表1。 <總透光率、霧值> 使用Suga Test Instruments股份有限公司製雙光束方 式霧值計算機（HZ — 2 )進行測定。 <折射率差> 關於丙烯酸系橡膠之試料，對折射率分別為丨59及 1.49之介質，一邊改變比率，一邊使其與樹脂試料混合， 將白濁消失之點設為其折射率（23它、55〇nm)。並且算出 與「以3 —雷射才斤射計測得之與加壓成形而成之耐軌性丙 烯酸系樹脂（A — 1，A—2)的折射率」之差。 <樹脂黏度（Ml值）〉 於已加熱之圓筒容器内，於特定溫度對一定量之合成 樹脂進行加熱、加壓，對每10分鐘從設於容器底部之開口 4擠出之樹月日里進行測定。試驗機械係使用規定 之擠出型塑性4，測定方法係依據 36 201219817 [表i] 實施例1 實施例2 實施例3 比較例1 比較例2 比較例3 对熱丙稀酸系 樹脂 A-1 45 47.5 55 45 47.5 55 A-2 15 17.5 20 15 17.5 20 丙烯酸系 橡膠微粒子 B — 1 20 17.5 12.5 0 0 0 B-2 20 17.5 12.5 0 0 0 b—1 0 0 0 20 17.5 12.5 總透光率(％) 93.0 93.1 93.2 93.2 93.2 93.2 霧值(％) 0.8 0.7 0.6 8.5 6.5 5.2 表面粗縫度Ra( y m) 0.04 〜0.05 0.03-0.04 0.01-0.02 3.5 2.5 1.5 厚度(/zm) 40 40 40 40 40 40 折射率差 0.009 0.01 0.01 0.055 0.045 0.035 樹脂黏度(MI值） 1.8 2.0 2.5 1.5 1.8 2.0 (研究探討等） 如上述表1所示，相較於比較例1〜3之片，實施例1 〜3之保護片的霧值極小，且具有不混濁的高透明性。 [產業上之可利用性] 本發明之保護片富有对熱性及可撓性且透明性高，因 此可用作例如導光板保護片。 【圖式簡單說明】 圖1，係本發明一實施形態之保護片的概略剖面圖。 圖2 ’係使用有圖1之保護片之液晶顯示元件的概略剖 面圖。 圖3 ’係使用有本發明其他實施形態之保護片之偏光板 的概略剖面圖。 【主要元件符號說明】 37 201219817 1 保護片 2 偏光元件 3 接著劑 4 液晶面板 5 消光加工層 6 硬塗層 38Rthl — {(nxl + nyl)/2—nzl}xd [nm] (b) where 'nxl is the principal refractive index in the plane direction of the protective sheet. η" is the refractive index in the direction orthogonal to nxl. The main refractive index of nzl is the thickness direction of the protective sheet. d is the thickness of the protective sheet. <Polarizing Plate> The protective sheet can be used as a polarizing plate protective sheet. Specifically, as shown in Fig. 29 201219817, the polarizing plate can be constituted by the protective sheet 1 and the plate-shaped polarizing element 2 interposed between the pair of protective sheets 1. The protective sheet 1 and the polarizing element 2 can be attached by an adhesive such as an aqueous paste (the drawing is omitted). <Liquid Crystal Display Element> The polarizing plate including the protective sheet 1 described above can be used for a liquid crystal display device. Specifically. As shown in Fig. 2, the liquid crystal display element can be constituted by a liquid crystal panel and a pair of the above-mentioned polarizing plates attached to both surfaces of the liquid crystal panel 3. The polarizing plate and the liquid crystal panel 3 can be attached by an adhesive 4 such as an ultraviolet effect type adhesive. <Other Embodiments> The present invention is not limited to the above-described embodiments, and various configurations are possible. Ten changes can be applied to the one side or both sides of the protective sheet. Thereby, it is possible to exert an effect of easily attaching the surface subjected to the matte finish to another member via an adhesive or the like. In the polarizing plate of Fig. 3, a matting layer 5 is formed on each of a pair of protective sheets. Further, a polarizing element 2 is disposed between the matting layers 5 of the pair of protective sheets i. The matting layer 5 and the polarizing element 2 are occupied by a water-based adhesive (scheme). This matting layer 5 can be formed using a matting agent. Specifically, a matting agent-containing coating liquid can be applied to one side of the protective sheet i to form the matte layer 5. In addition, the matting agent may use organic or inorganic fine particles, such as cerium oxide, talc, calcium carbonate, precipitated barium sulfate, alumina, acid white clay, clay 'carbonated money, carbon black, tin oxide, white ( The core (9), the urea powder resin, etc. Further, as shown in Fig. 3, a structure in which the hard coat layer 6 is formed in a single-layer layer of the protective sheet may be employed. In the case of the polarizing plate of Fig. 3, the protective sheet is 30 201219817 A hard coating layer 6 is formed on the area layer of the protective sheet 1 opposite to the polarizing element 2. This can improve the scratch resistance of the protective sheet 1. Further, the hard coat layer 6 It is formed of a coated acrylic paint, whereby the transparency of the hard coat layer 6 can be ensured, and the transparency of the protective sheet 1 can be maintained. [Embodiment 1] Hereinafter, the present invention is specifically described based on the present invention. It is limited to these examples. <Production of heat-resistant acrylic resin> [Synthesis Example 1] (Heat-resistant acrylic resin (A-1): (methyl acetoacetate acetophenone-phenethyl-methyl) Synthesis of acrylic acid-main chain 6-membered ring lactone) Modulation consists of the following components Mixture: as a monomer, methyl olefinic sorghum S曰35 stem damage, 25 parts by mass of ethylene, bismuth; 曱 曱 丙 丙 归 曱 曱 曰 曰 曰 曰 曰 及 及 及 及 及 及 及 及 及 及Separate mass of PERHEXA C (1,1 - 2 (tri-butylperoxy)cyclohexane) manufactured by Nippon Oil & Fats Co., Ltd. as a polymerization initiator as a polymerization initiator Ppm, and n-octyl thiol ι 5 〇〇 mass ppm as a molecular weight regulator. This mixture was continuously supplied at a feed rate of 1.5 L/hr to a fully mixed reactor with a 3 L content jacket. The polymerization reaction was carried out at a temperature of 125 ° C. The polymerization reaction liquid from the above reactor was continuously supplied to a high-temperature degassing set at a temperature of 260 ° C and a residence time of 2 hours, thereby performing bonding from copolymerization. The reaction of the thiol group of the main chain with the methoxy group dehydration, that is, the formation reaction of the 6-membered ring lactone of the main chain and the removal of the unreacted material 31 201219817. Thereafter, the heat resistance (4) (four) resin is obtained by treatment ( A_ small for this heat-resistant acrylic resin (α-D, for neutralization titration The results of analysis by IR spectroscopy and Uc-NMR, the structural unit derived from methacrylate, the structural unit derived from styrene, the primary bond 6-membered vinegar containing structural unit, and the structural unit derived from methacrylic acid Each of the content ratios is 45 mass% '30 mass%' 18 mass% and 7 mass%, and the melt flow rate 热 (astm_di 238; 230 C '3.8 kg load) of the thermal acrylic resin (A-1) is I.ig/10 minutes, glass transition temperature (135 ° C, refractive index of 1.528. [Synthesis Example 2] (heat-resistant acrylic resin (A-2): (methyl methacrylate-α-methyl stupid ethylene) - Synthesis of mercaptoacrylic acid - main chain 6-membered ring lactone) A mixed liquid composed of the following components: 48 parts by mass of methyl mercaptomethyl acrylate as a monomer, 6 parts by mass of α-methylstyrene, 〇_ 8 parts by mass of hydroxymercapto acrylate and 5 parts by mass of methacrylic acid, 40 parts by mass of tertiary butanol as a polymerization solvent, and Ul-bis(tertiary butylperoxy) as a polymerization initiator a 3,3,5-trimethylcyclohexane 5 〇〇 mass ppm, and as a molecular weight s weekly division The positive sulphur fermentation of the agent is 200 mass ppm. The mixture was continuously supplied to a full-scale reactor of an amount of 3 L at a supply rate of 15 L / hr, and polymerization was carried out at a temperature of 125 °C. The polymerization reaction liquid from the reactor was further continuously supplied to a high-temperature deaerator having a residence time of 260 ° C for 2 hours, whereby the main chain 6-membered ring lactone formation reaction and the removal of unreacted materials were carried out. Thereafter, a heat-resistant acrylic resin (A-2) was obtained by the treatment 32 201219817. As a result of neutralization titration, 1R spectrum, and 13C-NMR analysis of the heat-resistant acrylic resin (A-2), the structural unit derived from decyl methacrylate, the structural unit derived from α-methylstyrene, and the main component The content ratio of the structural unit of the chain 6-membered ring lactone and the structural unit derived from methacrylic acid was 80% by mass, 11% by mass, 6% by mass, and 3% by mass, respectively. Further, the melt flow rate value (ASTM - D1238; 23 (TC, 3.8 kg load) of the heat-resistant acrylic resin (Α 2) was 1.5 g/10 minutes' glass transition temperature (Tg) was 132. (:, refraction The yield is 1.504. <Production of Acrylic Rubber> [Synthesis Example 3] (three-layer structure of acrylic rubber fine particles) 300 parts by mass of ion-exchanged water was placed in a reaction vessel equipped with a stirrer, and the temperature was raised while nitrogen substitution was performed. After the addition, 0.3 parts by mass of sodium dihexylsulfosuccinate and 3 parts by mass of potassium persulfate were added, followed by addition of 23 parts by mass of methyl methacrylate as a monomer and 2 parts by mass of n-butyl acrylate. And a mixture of dimethyl acrylate and G.G3 parts by mass for 1 hour to complete the polymerization reaction. Then, 22 parts by mass of butyl acrylate as a monomer, benzene was added in 2 hours. After the mixture of 28 parts by mass of ethylene and K0 parts by mass of methacrylic acid propylene vinegar, the reaction was completed for 2 hours to complete the reaction, and the methyl methacrylate 22 as a monomer was added in an hour. Parts by mass and butyl acrylate The amount of the monomer and the monomer mixture of the n-octyl thiol mass fraction of the scalloping agent are kept '1 hour to complete the reaction. The obtained latex 33 201219817 (latex ) is used as sodium sulfate. After the salting-out agent is salted out, dehydrated, washed with water, dehydrated, and dried to obtain a powdered acrylic rubber (b_^. The obtained acrylic rubber microparticles (particle size of Β_υ 45 °, again, refractive index is 1.5. [Synthesis Example 4] (Synthesis of Acrylic Rubber Fine Particles of Two-Layer Structure) 300 parts by mass of ion-exchanged water was placed in a reaction vessel equipped with a stirrer, and the temperature was raised to 70 ° C while nitrogen substitution, and then sulfosuccinic acid was added. 3 parts by mass of sodium dihexyl ester oxime and 3 parts by mass of potassium persulfate. Then, 24 parts by mass of n-butyl acrylate as a monomer, 28 parts by mass of styrene, and methacrylic acid acryl were added for 2 hours. After 2.0 parts by mass of the mixture, the mixture was kept for 2 hours to complete the reaction. Then, 45 parts by mass of methyl methacrylate as a monomer and 3 parts by mass of n-butyl acrylate were added for 1 hour, and as a molecule After adjusting the mixture of n-octylmercaptoquinone.05 parts by mass of the amount adjusting agent, the reaction was completed for 1 hour, and the obtained latex was salted out using sodium sulfate as a salting-out agent, followed by dehydration, washing with water, and dehydration. And drying to obtain a powdery two-layer structure of acrylic rubber fine particles (B _ 2 ). The obtained acrylic rubber fine particles (B _ 2 ) have a particle diameter of 49 nm and a refractive index of 1.518 » <Production of protective sheet> [Example 1] 45 parts by mass of the heat-resistant acrylic resin (A-1) obtained in the above Synthesis Example, 15 parts by weight of (a-2), 20 parts by mass of acrylic rubber fine particles (B-1), and (b - 2 ) After 20 parts by mass of dry blending, use an extruder equipped with a τ-shaped mold on 34 201219817, and perform extrusion while adjusting the number of spiral rotations, the resin temperature in the cylinder of the extruder, and the temperature of the τ-shaped mold. Formed, whereby the embodiment is paid! Protective film. The surface roughness Ra of the protective sheet of this Example i is 0.04 to 〇_〇5"m' and its haze value. The surface roughness is an arithmetic mean roughness of c2.5 mm and an evaluation length of 12 5 mm measured in accordance with JIS-b_ 0601 - 2〇〇1. [Examples 2 and 3] In Example 1, the same procedure as in Example 1 was carried out except that the type and blending ratio of the heat-resistant acrylic resin and the acrylic rubber were set as shown in the following Tables. Protective sheets of Examples 2 and 3. The surface roughness of the protective sheet of this embodiment 2! ^为〇 〇3~〇 〇4 in m, the fog value is 〇 7 %. Further, the protective sheet of Example 3 had a surface roughness of 〇.〇 1 to 〇.〇2 M m and a haze value of 0.6%. [Comparative Examples 1 to 3] In Example 1, an acrylic rubber (b-1) having a primary average particle diameter of 〇5 A m or more was used as the acrylic rubber, and the heat-resistant acrylic resin was set as shown in Table 1 below. The protective sheets of Comparative Examples 1 to 3 were obtained in the same manner as in Example 1 except that the kind of the resin, the blending amount, and the blending amount of the acrylic rubber (b-1) were used. The surface of the protective sheet of Comparative Example 1 had a roughness of Ra of 3.5 and a haze value of 8.5%. Further, the protective sheet of Comparative Example 2 had a surface roughness Ra of 2.5 / zm and a haze value of 6.5%. Further, the protective sheet of Comparative Example 3 had a surface roughness (Ra) of 15 # m and a haze value of 5.2%. <Evaluation> 35 201219817 The following evaluation was performed on the protective sheet prepared above. The evaluation results are shown in Table 1 below. <Total light transmittance, haze value> The measurement was carried out using a two-beam mode fog value computer (HZ-2) manufactured by Suga Test Instruments Co., Ltd. <Refractive Index Difference> Regarding the acrylic rubber sample, the medium having a refractive index of 丨59 and 1.49 was mixed with the resin sample while changing the ratio, and the point at which the white turbidity disappeared was defined as the refractive index (23). It, 55〇nm). Further, the difference between the "refractive index of the orbital acrylic resin (A-1, A-2) which was measured by a 3-laser laser shot and the pressure-resistant acrylic resin (A-1, A-2) was calculated. <Resin viscosity (Ml value)> In a heated cylindrical container, a certain amount of synthetic resin is heated and pressurized at a specific temperature, and extruded from the opening 4 provided at the bottom of the container every 10 minutes. The measurement is carried out in the day. The test machine system uses the specified extrusion type plastic 4, and the measurement method is based on 36 201219817 [Table i] Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 Pair of hot acrylic resin A-1 45 47.5 55 45 47.5 55 A-2 15 17.5 20 15 17.5 20 Acrylic rubber microparticles B — 1 20 17.5 12.5 0 0 0 B-2 20 17.5 12.5 0 0 0 b—1 0 0 0 20 17.5 12.5 Total light transmittance (%) 93.0 93.1 93.2 93.2 93.2 93.2 Haze value (%) 0.8 0.7 0.6 8.5 6.5 5.2 Surface roughness Ra( ym) 0.04 ～0.05 0.03-0.04 0.01-0.02 3.5 2.5 1.5 Thickness (/zm) 40 40 40 40 40 40 Refractive index difference 0.0099 0.01 0.01 0.055 0.045 0.035 Resin viscosity (MI value) 1.8 2.0 2.5 1.5 1.8 2.0 (Research, etc.) As shown in Table 1 above, Examples 1 to 3 are compared with the sheets of Comparative Examples 1 to 3. The protective sheet has a very small haze value and high transparency without turbidity. [Industrial Applicability] The protective sheet of the present invention is rich in heat and flexibility and has high transparency, and thus can be used as, for example, a light guide sheet protective sheet. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic cross-sectional view showing a protective sheet according to an embodiment of the present invention. Fig. 2 is a schematic cross-sectional view showing a liquid crystal display element using the protective sheet of Fig. 1. Fig. 3 is a schematic cross-sectional view showing a polarizing plate using a protective sheet according to another embodiment of the present invention. [Main component symbol description] 37 201219817 1 Protective sheet 2 Polarizing element 3 Adhesive 4 Liquid crystal panel 5 Matte processing layer 6 Hard coating 38