201247405 六、發明說明： 【發明所屬之技術領域】 本發明係關於下部電極基板用樹脂，以及使用下部電 極基板用樹脂板之下部電極板及接觸式面板-。 【先前技術】 過去以來電阻膜方式之接觸式面板係使於基板之一面 上形成有透明電極膜所成之下部電極與上部電極板以相互 之透明電極膜彼此對向貼合之方式，在兩電極間插入隔離 件而成對向配置之構成，例如設置在液晶顯示器上，作爲 對液晶顯示器之資料輸入裝置使用。 液晶顯示器中設置接觸式面板時，一般係先在液晶面 板上載置接觸式面板，接著將1/4波長板、偏光板及顯示 器保護板以該順序載置於該接觸式面板上。 專利文獻1中記載之接觸式面板，係構成電阻膜方式 之接觸式面板之兩片電極板中，與液晶面板接觸之電極板 的下部電極板之基板（亦即，下部電極基板）爲玻璃，且 上述電極板之基板（亦即，上部電極基板）-爲聚對苯二甲 酸乙二醇酯樹脂板。然而，專利文獻1所記載之接觸式面 板有玻璃板較重且容易破裂之問題點。 [先前技術文獻] [專利文獻] [專利文獻1]特開2006-277769號公報 201247405 【發明內容】 [發明欲解決之課題] 本發明之目的係提供一種難以破裂且光學特性（例如 ’設置接觸式面板且抑制顯示於液晶顯示器上之畫面著色 )良好之下部電極基板用樹脂板。 [用以解決課題之手段] 本發明人等爲解決上述課題而重複積極硏究之結果， 而完成本發明。 亦即，本發明爲以下之發明》 (η —種下部電極基板用樹脂板，其爲接觸式面板 之下部電極基板中使用之樹脂板，其特徵爲在丙烯酸系樹 脂層之兩面上具有聚碳酸酯系樹脂層。 (2)如前述（1)項所記載之樹脂板，其中使波長 5 90nm之單色光相對於樹脂板面之法線以〇°之角度入射時 之遲滯値設爲Re(0)，以50°之角度入射峙之遲滯値設爲 Re(50)時，Re(0)與 Re(50)滿足式：丨 Re(0)-Re(50) | /50^1.6» (3 )如前述（1 )或（2 )項所記載之樹脂板，其中 使波長5 90nm之單色光相對於樹脂板面之法線以50°之角 度入射時之遲滞値Re(50)爲90nm以下。 (4)如前述（1)〜（3)項中任—項之樹脂板，其中 聚碳酸酯系樹脂層之厚度爲0.1mm以下。 (5 )如前述（1 )〜（4 )項中任一項之樹脂板，其係 -6- 201247405 自模嘴將具有聚碳酸酯系樹脂層之薄膜狀物熔融擠出於丙 烯酸系樹脂層之兩面上，且夾入於第一冷卻輥與第二冷卻 輥之間，捲繞在前述第二冷卻輥上，接著，捲繞在第三冷 卻輥之上而得。 (6 )如前述（5 )項所記載之樹脂板，其中第一冷卻 輥爲外周部具備金屬製薄膜之金屬彈性輥，第二冷卻輥爲 金屬輥。 (7) —種下部電極板，其係在如前述（1)〜（6)項 中任一項所記載之樹脂板之一面上設置透明電極膜而成》 (8) —種接觸式面板，其爲使下部電極板與上部電 極板以使透明電極膜彼此對向之方式，在前述下部電極板 與前述上部電極板之間介隔隔離件而對向配置所構成之接 觸式面板，其中前述下部電極板爲如前述（7)項所記載 之下部電極板。 (9) 一種顯示構件用樹脂板，其爲在丙烯酸系樹脂 層之兩面上具有聚碳酸酯系樹脂層之樹脂板，其特徵爲 使波長5 90nm之單色光相對於樹脂板面之法線以0°之 角度入射時之遲滯値設爲Re(0)，以50°之角度入射時之遲 滯値設爲Re(50)時，Re(0)與Re(50)滿足式：|Re(0)-Re(50) | /50 S 1.6 » [發明效果] 本發明之下部電極基板用樹脂板爲難以破裂，且可抑 制自斜向方向觀看設置接觸式面板之液晶顯示器時之液晶 201247405 顯示器上顯示之畫面之著色，光學特性優異。 【實施方式】 本發明之下部電極基板用樹脂板（以下有時稱爲「樹 脂板」）爲在丙烯酸系樹脂層之兩面上具有聚碳酸酯系樹 脂層。 前述丙烯酸系樹脂層包含丙烯酸系樹脂。構成前述丙 烯酸系樹脂層之丙烯酸系樹脂較好爲透明性優異、剛性亦 高之甲基丙烯酸樹脂。前述甲基丙烯酸樹脂可爲以甲基丙 烯酸甲酯單位作爲主成分之樹脂，具體而言，以總單體量 爲基準，爲含有通常爲50重量％以上，較好爲70重量％ 以上，更好爲90重量％以上之甲基丙烯酸申酯單位之樹脂 ，可爲甲基丙烯酸甲酯單位100重量％之申基丙烯酸甲酯 均聚物，亦可爲甲基丙烯酸甲酯及可與該申基丙烯酸甲酯 共聚合之其他單體之共聚物。 可與甲基丙烯酸甲酯共聚合之前述其他單體列舉爲例 如甲基丙烯酸乙酯、甲基丙烯酸丁酯、甲棊丙烯酸環己酯 、甲基丙烯酸苯酯、甲基丙烯酸苄酯、甲棊丙烯酸2-乙基 己酯、甲基丙烯酸2 -羥基乙酯等之甲基丙烯酸甲酯以外之 甲基丙烯酸酯類’或丙烯酸甲酯、丙烯酸乙酯、丙烯酸丁 酯、丙烯酸環己酯、丙烯酸苯酯、丙烯酸苄酯、丙烯酸2-乙基己酯、丙烯酸2-羥基乙酯等之丙烯酸酯類等。又，苯 乙烯或經取代之苯乙烯類列舉爲例如氯苯乙烯、溴苯乙烯 等之鹵化苯乙烯類，或乙烯基甲苯、α·甲碁苯乙烯等烷基 201247405 苯乙烯類等。另外，列舉爲甲基丙烯酸、丙烯酸等不飽和 酸類，丙烯腈、甲基丙烯腈、馬來酸酐、苯基馬來醯亞胺 、環己基馬來醯亞胺等。該等可與甲基丙烯酸甲酯共聚合 之其他單體可分別單獨使用，亦可組合兩種·以上使用。 丙烯酸樹脂亦可含有橡膠粒子。據此，可提高樹脂板 之耐衝擊性。該橡膠粒子列舉爲例如丙烯酸系多層構造聚 合物、於5〜80重量份之橡膠狀聚合物中接枝聚合丙烯酸 系不飽和單體等之乙烯性不飽和單體2 0〜95重量份而成之 接枝共聚物等。 前述丙烯酸系多層構造聚合物可爲內含20〜60重量％ 左右之彈性體層之聚合物，亦可爲具有硬質層作爲最外層 之聚合物，進而亦可爲具有硬質層作爲最內層之聚合物。 前述彈性體之層可爲玻璃轉移點（Tg)未達25 °C之丙 烯酸系聚合物之層，具體而言可爲以甲基丙烯酸烯丙酯等 之多官能基單體使由丙烯酸低級烷酯、甲基丙烯酸低級烷 酯、丙烯酸低級烷氧基烷酯、丙烯酸氰基乙酯、丙烯醯胺 、丙烯酸羥基低級烷酯、甲基丙烯酸羥基低級烷酯、丙烯 酸及甲基丙烯酸所組成群組選出之一種以上之單官能基單 體交聯而成之聚合物之層。 前述丙烯酸低級烷酯等中之低級烷基列舉爲例如甲基 、乙基、丙基、異丙基、丁基、第三丁基、戊基、己基等 碳數1~6之直鏈或分支之烷基，前述丙烯酸低級烷氧基烷 酯中之低級烷氧基列舉爲例如甲氧基、乙氧基、丙氧基、 異丙氧基' 丁氧基、第三丁氧基、戊氧基、己氧基等碳數 -9- 201247405 1〜6之直鏈或分支之烷氧基。又，以前述寧官能基單體作 爲主成分之共聚物時，亦可使作爲共聚合成分之例如苯乙 烯、經取代之苯乙烯等其他單官能基單體共聚合。 前述硬質層宜爲Tg爲25°C以上之丙烯酸系聚合物之 層，具體而言較好爲以具有碳數1〜4之烷碁之甲基丙烯酸 烷酯單獨、或作爲主成分聚合而成之層。茚述碳數1〜4之 烷基列舉爲例如甲基、乙基、丙基、異丙碁、丁基、第三 丁基等直鏈或分支之烷基。 以具有碳數1〜4之烷基之甲基丙烯酸烷酯作爲主成分 之共聚物之情況下，共聚物成分亦可使用其他甲基丙烯酸 烷酯或丙烯酸烷酯、苯乙烯、經取代之苯乙烯、丙烯腈、 甲基丙烯腈等單官能基單體，亦可進而添加甲基丙烯酸烯 丙酯等多官能基單體作爲交聯聚合物》前述甲基丙烯酸烷 酯等中之烷基列舉爲例如與前述低級烷基中所例示之相同 碳數1〜6之直鏈或分支之烷基等。 上述丙烯酸系多層構造聚合物記載於例如特公昭55-2 75 76號公報、特開平6- 8073 9號公報'#開昭49-23292 號公報等中。 於5~80重量份之橡膠狀聚合物中接枝聚合有乙烯性 不飽和單體20〜95重量份而成之前述接枝共聚物中，作爲 橡膠狀聚合物列舉爲例如聚丁二烯橡膠、丙烯腈/ 丁二烯 橡膠共聚物橡膠、苯乙烯/ 丁二烯共聚物椽膠等二烯系橡 膠’聚丙烯酸丁酯、聚丙烯酸丙酯、聚丙烯酸2-乙基己酯 等丙烯酸系橡膠，乙烯/丙烯/非共軛二烯系橡膠等。又， -10- 201247405 該橡膠狀聚合物中接枝共聚合所用之乙烯性單體列舉爲例 如苯乙烯、丙烯腈、（甲基）丙烯酸烷酯等。該等接枝共 聚物係記載於特開昭5 5 - 1 475 1 4號公報、特公昭47-9740 號公報等中。 橡膠粒子之使用量相對於丙烯酸樹脂1〇〇重量份，通 常爲3〜150重量份，較好爲4~50重量份，更好爲5〜3 0重 量份。橡膠粒子之使用量愈多，則樹脂之耐衝擊性提高， 有即使按壓亦不易破裂之傾向，但橡膠粒子之使用量太多 時，樹脂板之表面硬度降低故不佳。 另一方面，前述聚碳酸酯樹脂層包含聚碳酸酯樹脂。 構成前述聚碳酸酯系樹脂層之聚碳酸酯系樹脂列舉爲例如 以界面聚縮合法或熔融酯交換法等使二價酚與羰基化劑反 應而得之樹脂，以及以固相酯交換法等使碳酸酯預聚物聚 合所得之樹脂，以開環聚合法使環狀碳酸酯化合物聚合而 得之樹脂等。 前述二價酚列舉爲例如氫醌、間苯二甲酚、4,4’-二羥 基聯苯、雙（4 -羥基苯基）甲烷、雙{ (4 -羥基-3,5 -二甲 基）苯基}甲烷' 1,1-雙（4-羥基苯基）乙烷、1，1-雙（4-羥基苯基）-1 •苯基乙烷、2,2-雙（4-羥基苯基）丙烷（通 稱爲雙酚A) 、2,2-雙{(4-羥基-3-甲基）苯基}丙烷、 2,2-雙{(4-羥基-3,5-二甲基）苯基}丙烷、2,2-雙{(4-羥 基-3,5-二溴）苯基}丙烷、2,2-雙{( 3-異丙基-4-羥基）苯 基}丙烷、2,2-雙{ (4-羥基-3-苯基）苯基}丙烷、2，2-雙（ 4·羥基苯基）丁烷、2，2-雙（4-羥基苯基）-3-甲基丁烷、 -11 - 201247405 2,2-雙（4-羥基苯基）-3，3-二甲基丁烷、2,4-雙（4-羥基 苯基）-2·甲基丁烷、2,2-雙（4-羥基苯基）戊烷、2,2-雙 (4-羥基苯基）-4-甲基戊烷、1，1-雙（4-寒基苯基）環己 烷、1，1-雙（4-羥基苯基）-4-異丙基環己烷、1，1·雙（4· 羥基苯基）·3,3,5-三甲基環己烷' 9,9-雙（4-羥基苯基） 蕗、9,9-雙{ (4-羥基-3-甲基）苯基}葬、m’-雙（4-羥基 苯基）-鄰-二異丙基苯、α,α’-雙（4-羥基苯基）-間-二異 丙基苯、雙（4·羥基苯基）-對-二異丙基苯、1，3-雙 (4-羥基苯基）-5，7-二甲基金剛烷、4,4’-二羥基二苯基颯 、4,4’-二羥基二苯基亞颯、4,4’-二羥基二苯基硫醚、 4,4’-二羥基二苯基酮、4,4’-二羥基二苯碁醚、4,4’-二羥 基二苯基酯等，亦可視需要使用該等之兩镩以上。 其中，較好單獨使用由雙酚A、2,2-雙{ (4-羥基-3-甲 基）苯基}丙烷、2,2-雙（4-羥基苯基）丁烷、2,2-雙（4-羥基苯基）-3-甲基丁烷、2,2-雙（4-羥基苯基）-3,3-二甲 基丁烷、2，2-雙（4-羥基苯基）-4-甲基戊烷、1,1-雙（4-羥基苯基）·3,3,5-三甲基環己烷及α，α’-雙（4·羥基苯基 )-間-二異丙基苯選出之二價酚，或使用兩種以上，最好 單獨使用雙酚Α，或併用1,1-雙（4-羥基苯基）-3,3,5·三 甲基環己烷與由雙酚A、2,2-雙{(4·羥基-3-甲基）苯基} 丙烷及α，α’-雙（4-羥基苯基）-間-二異丙基苯選出之—種 以上之二價酚。 前述羰化劑列舉爲例如碳醯氯等羰基鹵化物、碳酸二 苯酯等碳酸酯、二價酚之二鹵甲酸酯等鹵甲酸酯等，亦可 -12- 201247405 視需要使用該等之兩種以上。 聚碳酸酯樹脂組成物中，爲了提高與丙烯酸系樹脂層 之密著性’亦可含有丙烯酸樹脂》具體而言，聚碳酸酯樹 脂層較好爲由相對於聚碳酸酯系樹脂100重量份，以 0.01〜1重量份之比例含有丙烯酸樹脂之聚碳酸酯樹脂組成 物構成。前述丙烯酸樹脂較好採用與前述丙烯酸系樹脂層 中使用之樹脂相同之丙烯酸樹脂，更好爲低分子量之樹脂 。至於較佳之分子量範圍爲1，000〜100,000。該分子量太 低時在擠出成形時丙烯酸樹脂會揮發，太高時造成丙烯酸 樹脂與聚碳酸酯系樹脂之相分離，有光透過率降低之虞。 又’層合於丙烯酸系樹脂層兩面上之聚碳酸酯系樹脂 層之各組成可相互相同，亦可不同。且，聚碳酸酯系樹脂 層及丙烯酸系樹脂層可分別視需要添加一種或兩種以上之 例如光安定劑、紫外線吸收劑、抗氧化劑、難燃劑、抗靜 電劑等添加劑。 本發明之樹脂板由於在丙烯酸系樹脂層之兩面具有聚 碳酸酯系樹脂層，故難以破裂，另外，即使自斜向方向觀 看設置有在下部電極基板上使用該樹脂板之-接觸式面板之 液晶顯示器’亦未見到液晶顯示器之顯示畫面著色，光學 特性良好。 樹脂板係藉由使丙烯酸系樹脂層，與於其兩面上層合 聚碳酸酯樹脂層共擠出成形而層合一體化適當的製造。進 行共擠出成形時，可藉由使用二基或三基之單軸或雙軸擠 出機’分別熔融混練丙烯酸系樹脂層之材料與聚碳酸酯系 -13- 201247405 樹脂層之材料後，透過饋料套管模嘴或多歧管模嘴等層合 而進行。經層合一體化之熔融樹脂只要使用例如輥單元等 冷卻固化即可。利用共擠出成形製造之樹脂板，相較於藉 由使用黏著劑或接著劑貼合而製造之樹脂板，就二次成形 較容易方面而言較佳。 以下，針對以共擠出製造樹脂板之一實施形態，參考 圖1加以詳細說明。如該圖所示，首先，分別以個別擠出 機1、2加熱丙烯酸系樹脂層之材料與聚碳酸酯系樹脂層 之材料並經熔融混練，且分別供給於饋料套管3中熔融層 合一體化後，自模嘴4擠出。 接著，使自模嘴4擠出之薄片狀或薄膜狀之熔融樹脂 以略水平方向對向配置夾持在第一冷卻輥5與第二冷卻輥 6之間，且以第三冷卻輥7緩慢冷卻，獲得樹脂板8。 若調整熔融樹脂之厚度' 或第一、第二冷卻輥5、6 之間隔、周速度等，則可調整所得樹脂板$之厚度。 第一、第二冷卻輥5 ' 6係以至少一方連接於馬達等 之旋轉驅動機構，二輥以特定周速度旋轉而構成。兩輥中 ，第二冷卻輥6係將夾持在兩輥間後之薄片狀或薄膜狀之 樹脂板予以捲繞之捲繞輥。 至於第一、第二冷卻輥5、6列舉爲例如具有剛性之 金屬輥、具有彈性之金屬彈性輥等。前述金屬輥列舉爲例 如鑽孔輥、螺旋輥等。至於前述金屬彈性輥具備例如軸輥 ，與以被覆該軸輥外周面之方式配置之熔融樹脂接觸之圓 筒形金屬製薄膜’在該等軸輥與該金屬製薄膜之間封入水 -14- 201247405 或油等經溫度控制之流體之輥，或於橡膠輥之表面捲繞金 屬帶之輥等。 第一、第二冷卻輥5、6可爲由金屬輥及金屬彈性輥 選出之一種構成，但較好爲組合金屬輥與金屬彈性輥而成 之構成。 藉由組合金屬輥與金屬彈性輥，可獲得遲滯値（ retardation )減低之樹脂板。亦即，使熔融樹脂夾持在金 屬輥與金屬彈性輥之間時，金屬彈性輥透過熔融樹脂沿著 金屬輥之外周面彈性變形成凹狀，使金屬彈性輥與金屬輥 透過熔融樹脂以特定接觸長度接觸。藉此，金屬輥與金屬 彈性輥成爲對於熔融樹脂面接觸壓著，而邊對夾持在該等 輥之間之熔融樹脂均勻加壓成面狀邊製膜。結果，獲得製 膜時之變形減低，且遲滯値減低之樹脂板。 另外，組合金屬輥與金屬彈性輥時，較好金屬彈性輥 爲第一冷卻輥5，金屬輥爲第二冷卻輥6。據此，可進一 步降低所得樹脂板在波長590nm之入射光之遲滯値（例如 ，Re(0)或 Re(50))。 夾持在第一冷卻輥5與第二冷卻輥6間之熔融樹脂以 第二冷卻輥6捲繞，接著，利用拉伸輥拉伸並捲取。此時 ，亦可在第二冷卻輥6之後設置第三冷卻輥7。藉此，由 於熔融樹脂緩慢冷卻，故可降低所得樹脂板之遲滯値。至 於第三冷卻輥並無特別限制，可採用過去以來擠出成形所 使用之常用之金屬輥。該金屬輥之具體例列舉爲鑽孔輥或 螺旋輥等。第三冷卻輥7之表面狀態較好爲鏡面 -15- 201247405 設置第三冷卻輥7之情況’使捲繞在第二冷卻輥6上 之熔融樹脂通過第二冷卻輥6與第三冷卻輥7之間’捲繞 在第三冷卻輕7上。第二冷卻輥6與第三冷卻輥7之間可 爲設有特定間隙之鬆弛狀態’亦可夾持在二輥間。又’亦 可在第三冷卻輥7以後設置第四冷卻輥、第五冷卻輥、 .........、第η冷卻輥（η爲自然數）之複數根冷卻輥，且將 捲繞於第三冷卻輥7上之薄膜依序捲繞在下一冷卻輥上。 樹脂板通常爲薄片狀或薄膜狀’且其厚度通常爲 0.1〜3mm，較好爲0.1~2mm，更好爲0.1〜1 · 5 mm，又更好 爲0.1〜1mm。樹脂板由於以丙烯酸系樹脂層與聚碳酸酯系 樹脂層構成，故難以破裂，且可減小厚度。樹脂板中，層 合於丙烯酸系樹脂層之兩面上之聚碳酸酯系樹脂層之各層 厚度較好爲0.1mm以下，更好爲0.005~0.lmm，又更好爲 0.01~0.1mm，最好爲〇 . 0 5 ~ 0 · 1 m m。聚碳酸酯系樹脂層之 厚度太大時，自斜向方向觀看設置有於下部電極基板中使 用該樹脂板之接觸式面板之液晶顯示器時，會有看見液晶 顯示器之顯示圖像著色之虞。另一方面，聚碳酸酯系樹脂 層之厚度太小時會有樹脂板容易破裂之虞。又，層合於丙 烯酸系樹脂層之兩面上之聚碳酸酯系樹脂層之各厚度可分 別相同’亦可不同。丙烯酸系樹脂層之厚度較好由樹脂板 整體厚度與聚碳酸酯樹脂層之厚度適當調整，但較好爲樹 脂板整體厚度之70~99%。 樹脂板之Re ( 50 )較好爲9〇nm以下，更好爲80nm 以下’又更好爲70nm以下。藉由使Re ( 50 )爲9〇nm以 -16- 201247405 下，自斜向方向觀看設置有於下部電極基板中使用樹脂板 之接觸式面板的液晶顯示器時更可抑制液晶顯示器之顯示 圖像著色。又，Re (50)爲使波長590 nm之單色光相對於 樹脂板面之法線，以50°之角度入射時之遲滯値。 樹脂板之Re(0)較好爲50nm以下，更好爲47nm以 下’又更好爲45 nm以下。Re (0)太大時，自正面方向觀 看設置有於下部電極基板中使用該樹脂板之接觸式面板的 液晶顯示器時會有看見液晶顯示器之顯示圖像著色之虞》 藉由使Re ( 0 )爲5〇nm以下，可抑制自正面方向觀 看接觸式面板時之顯示圖像之著色。又，Re (0)爲使波 長590nm之單色光相對於樹脂板面之法線，以〇。之角度入 射時之遲滞値。 樹脂板就抑制自斜向方向觀看接觸式面板之畫面時之 液晶顯示器之顯示圖像著色之觀點而言，Re(0)與Re(50) 較好滿足式：I Re(0)-Re(50)丨 /50$ 1.6。 該式中規定之丨Re(0)-Re(50)丨/50之値更好爲1.4以 下’又更好爲1 .2以下’最好爲1以下。藉由使Re(〇)與 Re(5 0)滿足上述式之關係，可進一步抑制自斜向方向觀看 設置有於下部電極基板中使用樹脂板之接觸式面板的液晶 顯示器時之液晶顯示器之顯示圖像之著色。| Re(0)-Re(50)| /50係表示使波長590nm之單色光相對於樹脂板 面之法線’以〇°之角度入射時之遲滯値，與以50。之角度 入射時之遲滯値之變化率，變化率超過1 .6時，自正面方 向觀看接觸式面板時之顯示圖像著色，與自斜向方向觀看 -17- 201247405 時之顯示圖像之著色之顔色差異變大，會有顯示圖像之著 色更被強調且辨識到之虞。 滿足上述式只要例如自模嘴將具有聚碳酸酯系樹脂層 之薄膜狀物熔融擠出於丙烯酸系樹脂層之兩面上，且夾持 在第一冷卻輥與第二冷卻輥之間，捲繞在該第二冷卻輥上 製造該樹脂板即可，就使丨Re (0)-Re (50) | /50之値變小之 觀點而言，更好第一冷卻輥爲金屬彈性輥，第二冷卻輥爲 金屬輥。又亦可在第二冷卻輥以後以後設氧第三冷卻輥， 接著，在第三冷卻輥以後設置第四冷卻輥、第五冷卻輥、 .........、第η冷卻輥（η爲自然數）之複數裉之輥。 丙烯酸系樹脂層之兩面上具有聚碳酸酯系樹脂層之樹 脂板，Re(0)與 Re(50)滿足式：丨 Re (0) - R e (5 0)丨 / 5 0 S 1.6 之樹脂板由於使波長5 90nm之單色光相對妗樹脂板面之法 線，以〇°之角度入射時之遲滯値與以5(Γ之角度入射時之 遲滯値之變化率在特定範圍內，故自正面方向觀看樹脂板 時與自斜向方向觀看時之著色之顏色差異小，可使用於各 種顯示構件之用途中，例如可使用作爲液晶顯示器之表面 保護板或接觸式面板之表面保護板等。 樹脂板之至少一面上亦可爲具有凹凸形狀之毛面。樹 脂板之至少一面爲毛面時，該毛面較好爲液晶面板側之面 ，亦即未形成透明電極膜之面。 如此獲得之本發明樹脂板較好係使用作爲接觸式面板 之下部電極基板。使用樹脂板作爲下部電極基板時，藉由 先將樹脂板切斷成必要大小，接著，在該樹脂板之一面上 -18- 201247405 設置透明電極膜，而製作下部電極板。 透明電極膜係由金屬氧化物構成。至於金屬氧化物列 舉爲例如ΑΤΟ (銻·錫氧化物）或ITO (銦•錫氧化物） 等，尤其，ΙΤΟ之透明性優異故較佳。透明電極膜之厚度 較好爲5〜50 μπι。 製作透明電極膜之方法列舉爲例如真空蒸鍍法、濺鍍 法、離子化蒸鍍法、CVD法等。 就提高樹脂板與透明電極膜之密著性之觀點而言，樹 脂板之形成透明電極膜之一面上亦可設置樹脂層。構成樹 脂層之樹脂較好爲透明性優異之樹脂。樹脂層之厚度較好 爲lnm〜5μηι。未達lnm時會有無法獲得充分密著性提高 效果之虞，超過5μηι時則自斜向方向觀看設置有於下部電 極基板中使用樹脂板之接觸式面板之液晶顯示器時，會有 看見液晶顯示器之顯示圖像著色之虞。 電阻膜方式接觸式面板係以使上部電極板與下部電極 板透過隔離件，使二電極板之透明電極膜彼此相向貼合之 方式對向配置而成之.構成。 將該接觸式面板設置於液晶顯示器上時，係使下部電 極板接觸液晶面板而設置。 上部電極板係在上部電極基板之一面上設置透明電極 膜而製作。 電阻膜方式接觸式面板由於係藉由經按壓上部電極板 與下部電極板接觸而通電，而檢測出受按壓之位置，故上 部電極基板較好具有可撓性。就該可撓性之觀點而言，上 -19- 201247405 部電極基板之厚度較好爲10〜400μϊη。 至於上部電極基板係使用透明性優異之樹脂薄膜，通 常使用聚對苯二甲酸乙二醇酯。又，本發明之樹脂板可使 用於上部電極基板上，亦可以上部電極基板與下部電極基 板之二基板作爲本發明之樹脂板。該情況下，構成二基板 之樹脂板之厚度可彼此相同，亦可不同。 樹脂板並不限制於使用作爲電阻膜方式接觸式面板之 下部電極基板，亦可使用作爲其他檢測方武之接觸式面板 之電極基板，例如亦可使用作爲靜電電容方式接觸式面板 之電極基板。靜電電容方式接觸式面板爲在電極基板之一 面上，於具備透明電極膜之電極板的透明電極膜上形成保 護膜而構成。液晶顯示器上設置靜電電容方式接觸式面板 時，係使電極基板面接觸液晶面板而設置。 至於該電極基板通常使用玻璃板，但舷璃板重且有容 易破裂之問題。因此，藉由使用本發明之樹脂板代替玻璃 板可改善該問題。 至於接觸式面板之用途列舉爲例如攜帶型遊戲機之顯 示窗、攜帶型汽車導航系統或攜帶型資訊終端之顯示器、 銀行ATM之顯示器、產業機械之操作面板等。使用本發 明之樹脂板作爲下部電極板之接觸式面板，由於下部電極 基板爲本發明之樹脂板故輕量，另外，由於不易破裂，故 藉由使樹脂板之厚度變薄而可使接觸式面抿薄型化，尤其 較好使用作爲攜帶用途》 -20- 201247405 [實施例] 以下，例示本發明之實施例，但本發明並不受限於該 等實施例。 以下之實施例及比較例中使用之擠出裝置之構成如下 •擠出機1:使用螺旋直徑65 mm，單軸，附加通氣口 之擠出機（東芝機械（股）製造）。 •擠出機2:使用螺旋直徑4 5mm，單軸，附加通氣口 之擠出機（日立造船（股）製造）。 •饋料套管3 :使用二種三層分配型之饋料套管（曰 立造船（股）製造）。 .模嘴4 :使用唇寬1 400mm、唇間隔1mm之T模嘴 (曰立造船（股）製造）。 .第一、第二、第三冷卻輥5、6、7 :使用橫式、面 長1400mm，直徑300ηιιηφ之冷卻輥。 針對第一、第二、第三冷卻輥5、6、7，更具體說明 時，第一冷卻輥5係使用金屬彈性輥。該金屬彈性輥係採 用以被覆軸輥之外周面之方式配置金屬製薄膜’且在軸輥 與金屬製薄膜之間封入流體之輥。 軸輥、金屬製薄膜及流體係如下。 軸輥：不鏽鋼製。 金屬製薄膜：厚度2mm之不鏽鋼製鏡面金屬套管。 流體：油，藉由溫度控制該油’使金屬彈性輥成爲可 控制溫度。更具體而言，可藉由溫度調節機之開關控制而 -21 - 201247405 加熱、冷卻前述油而可控制溫度，且在軸輥與金屬製薄膜 之間循環。 第二、第三冷卻輥6、7係使用高剛性金屬輥。該金 屬輥爲表面狀態爲鏡面之不鏽鋼製螺旋輥。 實施例及比較例中使用之樹脂爲以下兩種。 •樹脂1 :使用熱變形溫度（Th ) 14〇t之住友Dow ( 股）製造之聚碳酸酯樹脂「CALIBER301-10」。 •樹脂2 :使用熱變形溫度（Th ) 100t之住友化學（ 股）製造之甲基丙烯酸樹脂「SUMIPEXEX」。 [實施例1~4及比較例1] 〈樹脂板之製作〉 首先，如圖1所示配置擠出機1、2、饋料套管3、模 嘴4、第一、第二、第三冷卻輥5、6'7。接著，以擠出 機1熔融混練作爲樹脂層A之表1所示種類之樹脂，以擠 出機2熔融混練作爲樹脂層B之表1所示镩類之樹脂，且 分別供給於饋料套管，將自擠出機2供給於饋料套管之樹 脂層B層合於自擠出機1供給於饋料套管艺樹脂層A之兩 面上而成之薄膜狀熔融樹脂自模嘴4擠出d 接著，將自模嘴4擠出之薄膜狀之熔融樹脂夾持在對 向配置之第一冷卻輥5與第二冷卻輥6之間，接著捲繞於 第三冷卻輥7上並經成形·冷卻，獲得於樹脂層A之兩面 上層合樹脂層B之具有表1所示厚度之三層構成之樹脂板 。所得各樹脂板中之樹脂層A兩面之層合樹脂層B之各組 -22- 201247405 成及厚度係彼此相同。 又，表1中之擠出機1中之「厚度」表示樹脂層 厚度，濟出機2中之「厚度」表示樹脂層8之厚度’ 厚度」表示所得樹脂板之總厚度。 〈評價〉 針對所得各樹脂板’評價遲滯値及自斜向方向· 之著色。各評價方法列於下’其結果—倂示於表1。 [遲滯値（Re(0)、Re(50))] 使用王子量測機器（股）製造之自動雙折射 KOBRA- WR」，使波長590nm之單色光相對於樹辟 之法線，測定以〇°之角度入射時之遲滯値（Re(0)) 以5 0°之角度入射時之遲滯値（Re(50))。接著，由 及 Re(50)之値求得（| Re(0)-Re(50) | /50)。 [自斜向方向觀看時之著色] 使用所得樹脂板作爲接觸式面板之下部電極基相 著假定將該接觸式面板設置於液晶顯示器上之情況， 以下之評價。 首先，將上述獲得之樹脂板之一面與第一偏光相 面重疊。接著，以使偏光軸與第一偏光板正交之方矣 二偏光板重疊於樹脂板之另一面上。第一、第二偏3 使用住友化學（股）製造之「SUMIKARAN SG」， A之 「總 看時 計「 丨板面 ，及 Re(0) ，接 進行 之一 將第 板均 -23- 201247405 接著，邊以三波長形螢光燈（三菱電機 )製造之「LUPICA-S」之光照射第二偏光板 第二偏光板面上斜45度之方向，透過第二偏 脂板之另一面，以目視觀察該面是否看見著色 基準如下。 〇：未看見著色 X :看見著色 [比較例2] 以擠出機1熔融混練表1所示種類之樹脂 給於饋料套管3及模嘴4中。接著，使自模嘴 融樹脂夾持在對向配置之第一冷卻輥5與第= 間，接著捲繞在第三冷卻輥7上成形•冷細’ 1所示厚度之單層板。 針對所得單層板，與實施例1同樣’評價 斜向方向觀看時之著色。其結果示於表1° OSRAM (股 面，邊自該 光板觀看樹 。又，判定 ，且依序供 4擠出之熔 冷卻輥6之 獲得具有表 遲滞値及自 -24- 201247405[Technical Field] The present invention relates to a resin for a lower electrode substrate, and a lower electrode plate and a contact panel using a resin plate for a lower electrode substrate. [Prior Art] In the past, the resistive film type contact panel has a method in which a transparent electrode film is formed on one surface of a substrate and a lower electrode and an upper electrode plate are opposed to each other by a transparent electrode film. The spacer is interposed between the electrodes to form an opposite arrangement, for example, disposed on the liquid crystal display, and is used as a data input device for the liquid crystal display. When a touch panel is provided in a liquid crystal display, a contact panel is generally placed on the liquid crystal panel, and then the 1/4 wavelength plate, the polarizing plate, and the display protection plate are placed on the contact panel in this order. In the contact panel described in Patent Document 1, the two electrode plates constituting the contact panel of the resistive film type are glass, and the substrate (ie, the lower electrode substrate) of the lower electrode plate of the electrode plate that is in contact with the liquid crystal panel is glass. Further, the substrate of the electrode plate (that is, the upper electrode substrate) is a polyethylene terephthalate resin plate. However, the contact panel described in Patent Document 1 has a problem that the glass sheet is heavy and easily broken. [PRIOR ART DOCUMENT] [Patent Document 1] JP-A-2006-277769 (2012) [Abstract] The object of the present invention is to provide an optical property (for example, 'setting contact The panel is used to suppress the coloration of the screen displayed on the liquid crystal display. [Means for Solving the Problems] The present inventors have completed the present invention by repeating the results of active research to solve the above problems. In other words, the present invention is the invention of the present invention (n) a resin sheet for a lower electrode substrate which is a resin sheet used in a lower electrode substrate of a contact panel, which is characterized in that it has polycarbonate on both sides of the acrylic resin layer. (2) The resin sheet according to the above (1), wherein the hysteresis when the monochromatic light having a wavelength of 5 90 nm is incident at an angle of 〇 with respect to the normal line of the resin plate surface is set to Re. (0) When the hysteresis of incident 峙 at an angle of 50° is set to Re(50), Re(0) and Re(50) satisfy the formula: 丨Re(0)-Re(50) | /50^1.6» (3) The resin sheet according to the above (1) or (2), wherein a retardation 値Re (50) when a monochromatic light having a wavelength of 5 90 nm is incident at an angle of 50° with respect to a normal line of the resin plate surface (4) The resin sheet according to any one of the above items (1) to (3), wherein the polycarbonate resin layer has a thickness of 0.1 mm or less. (5) as described above (1) to (1) A resin sheet according to any one of the items 4 to 201247405, wherein a film having a polycarbonate resin layer is melt-extruded from both sides of the acrylic resin layer, and is sandwiched between A cooling plate and a second cooling roll are wound around the second cooling roll, and then wound on the third cooling roll. (6) The resin plate as described in the above item (5), The first cooling roller is a metal elastic roller having a metal film on the outer peripheral portion, and the second cooling roller is a metal roller. (7) A lower electrode plate which is in any one of the above items (1) to (6). A transparent electrode film is provided on one surface of the resin sheet according to the item. (8) A contact panel in which the lower electrode plate and the upper electrode plate are opposed to each other such that the transparent electrode film faces each other. A contact panel formed by opposing a spacer between the plate and the upper electrode plate, wherein the lower electrode plate is a lower electrode plate as described in the above item (7). (9) A resin for a display member A plate which is a resin plate having a polycarbonate resin layer on both surfaces of an acrylic resin layer, and is characterized in that when a monochromatic light having a wavelength of 5 90 nm is incident at an angle of 0° with respect to a normal line of the resin plate surface Hysteresis 値 is set to Re (0), incident at an angle of 50° When the hysteresis 时 is set to Re (50), Re(0) and Re(50) satisfy the formula: |Re(0)-Re(50) | /50 S 1.6 » [Effect of the invention] The lower electrode substrate of the present invention The resin sheet is difficult to be broken, and the color of the screen displayed on the liquid crystal display 201247405 when the liquid crystal display provided with the touch panel is viewed from the oblique direction can be suppressed, and the optical characteristics are excellent. [Embodiment] The resin for the lower electrode substrate of the present invention The plate (hereinafter sometimes referred to as "resin plate") has a polycarbonate resin layer on both surfaces of the acrylic resin layer. The acrylic resin layer contains an acrylic resin. The acrylic resin constituting the acryl-based resin layer is preferably a methacrylic resin which is excellent in transparency and high in rigidity. The methacrylic resin may be a resin having a methyl methacrylate unit as a main component, and specifically, it is contained in an amount of usually 50% by weight or more, preferably 70% by weight or more, based on the total monomer amount. Preferably, the resin of 90% by weight or more of the methacrylic acid ester unit may be 100% by weight of methyl methacrylate unit of methyl methacrylate homopolymer, or may be methyl methacrylate and may be used together with the application. Copolymer of other monomers copolymerized with methyl acrylate. The aforementioned other monomers copolymerizable with methyl methacrylate are exemplified by, for example, ethyl methacrylate, butyl methacrylate, cyclohexyl methacrylate, phenyl methacrylate, benzyl methacrylate, formazan. Methyl acrylates other than methyl methacrylate such as 2-ethylhexyl acrylate or 2-hydroxyethyl methacrylate or methyl acrylate, ethyl acrylate, butyl acrylate, cyclohexyl acrylate, acrylic acid Acrylates such as phenyl ester, benzyl acrylate, 2-ethylhexyl acrylate, 2-hydroxyethyl acrylate, and the like. Further, styrene or substituted styrenes are exemplified by halogenated styrenes such as chlorostyrene and bromostyrene, and alkyl 201247405 styrenes such as vinyltoluene and α-methylstilbene. Further, it is exemplified by unsaturated acids such as methacrylic acid and acrylic acid, acrylonitrile, methacrylonitrile, maleic anhydride, phenyl maleimide, and cyclohexylmaleimide. These other monomers copolymerizable with methyl methacrylate may be used singly or in combination of two or more. The acrylic resin may also contain rubber particles. According to this, the impact resistance of the resin sheet can be improved. The rubber particles are, for example, an acrylic multilayer structure polymer, and 20 to 95 parts by weight of an ethylenically unsaturated monomer such as an acrylic acid-unsaturated monomer grafted to a rubber-like polymer of 5 to 80 parts by weight. Graft copolymers and the like. The acrylic multilayer structure polymer may be a polymer containing an elastomer layer of about 20 to 60% by weight, a polymer having a hard layer as an outermost layer, or a polymer having a hard layer as an innermost layer. Things. The layer of the above-mentioned elastomer may be a layer of an acrylic polymer having a glass transition point (Tg) of less than 25 ° C, and specifically may be a polyalkylene acrylate obtained by using a polyfunctional monomer such as allyl methacrylate or the like. a group consisting of ester, lower alkyl methacrylate, lower alkoxyalkyl acrylate, cyanoethyl acrylate, acrylamide, hydroxy lower alkyl acrylate, hydroxy lower alkyl methacrylate, acrylic acid and methacrylic acid A layer of a polymer obtained by crosslinking one or more monofunctional monomers. The lower alkyl group in the above-mentioned lower alkyl acrylate or the like is exemplified by a straight chain or a branch having a carbon number of 1 to 6 such as a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, a tributyl group, a pentyl group or a hexyl group. The alkyl group, the lower alkoxy group in the above lower alkyl alkoxyalkyl acrylate is exemplified by, for example, a methoxy group, an ethoxy group, a propoxy group, an isopropoxy group, a butoxy group, a third butoxy group, a pentyloxy group. A linear or branched alkoxy group having a carbon number of from 9 to 201247405 1 to 6 such as a hexyloxy group. Further, in the case of using a copolymer having a nucleating functional group as a main component, other monofunctional monomers such as styrene or substituted styrene as a copolymerization component may be copolymerized. The hard layer is preferably a layer of an acrylic polymer having a Tg of 25 ° C or higher. Specifically, it is preferably an alkyl methacrylate having an alkyl anthracene having 1 to 4 carbon atoms, which is polymerized alone or as a main component. Layer. The alkyl group having a carbon number of 1 to 4 is exemplified by a linear or branched alkyl group such as a methyl group, an ethyl group, a propyl group, a isopropyl group, a butyl group or a tert-butyl group. In the case of a copolymer having a methacrylic acid alkyl ester having an alkyl group having 1 to 4 carbon atoms as a main component, the copolymer component may also use other alkyl methacrylate or alkyl acrylate, styrene, substituted benzene. a monofunctional monomer such as ethylene, acrylonitrile or methacrylonitrile, or a polyfunctional monomer such as allyl methacrylate may be further added as a crosslinked polymer, and an alkyl group in the alkyl methacrylate or the like may be mentioned. For example, it is a linear or branched alkyl group having the same carbon number of 1 to 6 as exemplified in the above lower alkyl group. The above-mentioned acryl-type multilayer structure polymer is described in, for example, Japanese Patent Publication No. Sho 55-2 7576, Japanese Patent Application Laid-Open No. Hei No. Hei. The graft copolymer is obtained by graft-polymerizing from 50 to 80 parts by weight of the rubbery polymer to 20 to 95 parts by weight of the ethylenically unsaturated monomer, and the rubbery polymer is exemplified by, for example, polybutadiene rubber. , acrylic acid such as acrylonitrile/butadiene rubber copolymer rubber, styrene/butadiene copolymer tannin rubber, polybutyl acrylate, polypropyl acrylate, 2-ethylhexyl polyacrylate , ethylene/propylene/non-conjugated diene rubber, and the like. Further, -10-201247405 The ethylenic monomer used for graft copolymerization in the rubbery polymer is exemplified by styrene, acrylonitrile, alkyl (meth)acrylate, and the like. The above-mentioned graft copolymer is described in JP-A-55-1475, JP-A-47-9740, and the like. The amount of the rubber particles used is usually 3 to 150 parts by weight, preferably 4 to 50 parts by weight, more preferably 5 to 30 parts by weight, per part by weight of the acrylic resin. When the amount of the rubber particles used is increased, the impact resistance of the resin is improved, and the pressure is less likely to be broken even when pressed. However, when the amount of the rubber particles used is too large, the surface hardness of the resin sheet is lowered, which is not preferable. On the other hand, the polycarbonate resin layer contains a polycarbonate resin. The polycarbonate-based resin constituting the polycarbonate-based resin layer is, for example, a resin obtained by reacting a divalent phenol with a carbonylating agent by an interfacial polycondensation method or a melt transesterification method, or a solid phase transesterification method. A resin obtained by polymerizing a carbonate prepolymer, a resin obtained by polymerizing a cyclic carbonate compound by a ring-opening polymerization method, or the like. The above divalent phenols are exemplified by, for example, hydroquinone, meta-xyl phenol, 4,4'-dihydroxybiphenyl, bis(4-hydroxyphenyl)methane, bis{(4-hydroxy-3,5-dimethyl Phenyl}methane' 1,1-bis(4-hydroxyphenyl)ethane, 1,1-bis(4-hydroxyphenyl)-1 •phenylethane, 2,2-bis(4-hydroxyl Phenyl)propane (commonly known as bisphenol A), 2,2-bis{(4-hydroxy-3-methyl)phenyl}propane, 2,2-bis{(4-hydroxy-3,5-dimethyl Phenyl}propane, 2,2-bis{(4-hydroxy-3,5-dibromo)phenyl}propane, 2,2-bis{(3-isopropyl-4-hydroxy)phenyl} Propane, 2,2-bis{(4-hydroxy-3-phenyl)phenyl}propane, 2,2-bis(4.hydroxyphenyl)butane, 2,2-bis(4-hydroxyphenyl) -3-methylbutane, -11 - 201247405 2,2-bis(4-hydroxyphenyl)-3,3-dimethylbutane, 2,4-bis(4-hydroxyphenyl)-2· Methyl butane, 2,2-bis(4-hydroxyphenyl)pentane, 2,2-bis(4-hydroxyphenyl)-4-methylpentane, 1,1-bis (4-cold base) Phenyl)cyclohexane, 1,1-bis(4-hydroxyphenyl)-4-isopropylcyclohexane, 1,1·bis(4.hydroxyphenyl)·3,3,5-trimethyl Cyclohexane ' 9,9-double (4- Phenyl, quinone, 9,9-bis{(4-hydroxy-3-methyl)phenyl} burial, m'-bis(4-hydroxyphenyl)-o-diisopropylbenzene, α,α '-Bis(4-hydroxyphenyl)-m-diisopropylbenzene, bis(4.hydroxyphenyl)-p-diisopropylbenzene, 1,3-bis(4-hydroxyphenyl)-5 , 7-dimethyl adamantane, 4,4'-dihydroxydiphenylanthracene, 4,4'-dihydroxydiphenylarylene, 4,4'-dihydroxydiphenyl sulfide, 4,4 '-Dihydroxydiphenyl ketone, 4,4'-dihydroxydiphenyl oxime ether, 4,4'-dihydroxydiphenyl ester, etc., or two or more of these may be used as needed. Among them, it is preferred to use bisphenol A, 2,2-bis{(4-hydroxy-3-methyl)phenyl}propane, 2,2-bis(4-hydroxyphenyl)butane, 2, 2 alone. - bis(4-hydroxyphenyl)-3-methylbutane, 2,2-bis(4-hydroxyphenyl)-3,3-dimethylbutane, 2,2-bis(4-hydroxybenzene 4-methylpentane, 1,1-bis(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane and α,α'-bis(4.hydroxyphenyl)- Divalent phenol selected from m-diisopropylbenzene, or two or more, preferably bisphenol oxime alone or in combination with 1,1-bis(4-hydroxyphenyl)-3,3,5·3 Cyclohexane with bisphenol A, 2,2-bis{(4.hydroxy-3-methyl)phenyl}propane and α,α'-bis(4-hydroxyphenyl)-m-diisopropyl The above-mentioned divalent phenol is selected from the group of benzene. Examples of the carbonylating agent include a carbonyl halide such as carbon ruthenium chloride, a carbonate such as diphenyl carbonate, or a haloformate such as a dihalo valinate of divalent phenol. Alternatively, -12-201247405 may be used as needed. Two or more. In the polycarbonate resin composition, in order to improve the adhesion to the acrylic resin layer, the acrylic resin may be contained. Specifically, the polycarbonate resin layer is preferably used in an amount of 100 parts by weight based on 100 parts by weight of the polycarbonate resin. It is composed of a polycarbonate resin composition containing an acrylic resin in a ratio of 0.01 to 1 part by weight. The acrylic resin is preferably an acrylic resin which is the same as the resin used in the acrylic resin layer, and more preferably a low molecular weight resin. The preferred molecular weight range is from 1,000 to 100,000. When the molecular weight is too low, the acrylic resin volatilizes during extrusion molding, and when it is too high, the acrylic resin and the polycarbonate resin are phase-separated, and the light transmittance is lowered. Further, the respective compositions of the polycarbonate resin layers laminated on both surfaces of the acrylic resin layer may be the same or different. Further, as the polycarbonate resin layer and the acrylic resin layer, one or two or more additives such as a light stabilizer, an ultraviolet absorber, an antioxidant, a flame retardant, and an antistatic agent may be added as needed. Since the resin sheet of the present invention has a polycarbonate resin layer on both surfaces of the acrylic resin layer, it is difficult to be broken, and a contact panel using the resin sheet on the lower electrode substrate is provided even when viewed from the oblique direction. The liquid crystal display 'has not seen the coloration of the display screen of the liquid crystal display, and the optical characteristics are good. The resin sheet is produced by laminating and integrating an acrylic resin layer with a polycarbonate resin layer laminated on both surfaces thereof. When co-extrusion molding is carried out, the material of the acrylic resin layer and the material of the polycarbonate-based-13-201247405 resin layer can be melt-kneaded by using a two- or three-base uniaxial or biaxial extruder. It is carried out by laminating a feed sleeve nozzle or a multi-manifold nozzle. The melted resin which is laminated and integrated may be cooled and solidified by using, for example, a roll unit. A resin sheet produced by co-extrusion molding is preferable in terms of secondary molding as compared with a resin sheet produced by laminating with an adhesive or an adhesive. Hereinafter, an embodiment in which a resin sheet is produced by co-extrusion will be described in detail with reference to Fig. 1 . As shown in the figure, first, the material of the acrylic resin layer and the material of the polycarbonate resin layer are heated by the individual extruders 1, 2, respectively, and melt-kneaded, and supplied to the molten layer in the feed sleeve 3, respectively. After integration, it is extruded from the die mouth 4. Then, the sheet-like or film-like molten resin extruded from the die mouth 4 is sandwiched between the first cooling roll 5 and the second cooling roll 6 in a direction slightly opposed to the horizontal direction, and is slowly moved by the third cooling roll 7. After cooling, a resin plate 8 was obtained. The thickness of the obtained resin sheet $ can be adjusted by adjusting the thickness of the molten resin or the interval between the first and second cooling rolls 5 and 6, the peripheral speed, and the like. The first and second cooling rolls 5'6 are connected to at least one of the rotation driving mechanisms of the motor or the like, and the two rolls are rotated at a specific peripheral speed. Among the two rolls, the second cooling roll 6 is a winding roll in which a sheet-like or film-like resin sheet which is sandwiched between the rolls is wound. As for the first and second cooling rolls 5, 6, for example, a metal roll having rigidity, a metal elastic roll having elasticity, or the like is exemplified. The aforementioned metal rolls are exemplified by, for example, a drill roll, a spiral roll, and the like. The metal elastic roller includes, for example, a shaft roll, and a cylindrical metal film which is in contact with the molten resin disposed to cover the outer peripheral surface of the shaft roll, and water-14 is sealed between the isometric roll and the metal film. 201247405 A roller of a temperature-controlled fluid such as oil, or a roll of a metal belt wound on the surface of a rubber roller. The first and second cooling rolls 5, 6 may be of a metal roll and a metal elastic roll, but are preferably formed by combining a metal roll and a metal elastic roll. By combining a metal roll and a metal elastic roll, a resin plate having reduced retardation can be obtained. That is, when the molten resin is sandwiched between the metal roll and the metal elastic roll, the metal elastic roll is elastically deformed by the molten resin along the outer peripheral surface of the metal roll to form a concave shape, and the metal elastic roll and the metal roll are passed through the molten resin to be specified. Contact length contact. Thereby, the metal roll and the metal elastic roll are pressed against the surface of the molten resin, and the molten resin sandwiched between the rolls is uniformly pressed into a planar shape. As a result, a resin sheet in which the deformation at the time of film formation was reduced and the hysteresis was reduced was obtained. Further, when the metal roll and the metal elastic roll are combined, the metal elastic roll is preferably the first cooling roll 5, and the metal roll is the second cooling roll 6. According to this, the hysteresis 値 (for example, Re(0) or Re(50)) of the incident light of the obtained resin sheet at a wavelength of 590 nm can be further lowered. The molten resin held between the first cooling roll 5 and the second cooling roll 6 is wound by the second cooling roll 6, and then stretched and taken up by a stretching roll. At this time, the third cooling roll 7 may be provided after the second cooling roll 6. Thereby, since the molten resin is slowly cooled, the hysteresis of the obtained resin sheet can be lowered. The third cooling roll is not particularly limited, and a conventional metal roll used in extrusion molding in the past can be used. Specific examples of the metal roll are exemplified by a drill roll or a spiral roll. The surface state of the third cooling roll 7 is preferably mirror--15-201247405. The case where the third cooling roll 7 is disposed 'The molten resin wound on the second cooling roll 6 passes through the second cooling roll 6 and the third cooling roll 7 Between the 'winding on the third cooling light 7'. The relaxed state in which the second cooling roller 6 and the third cooling roller 7 are provided with a specific gap may be sandwiched between the two rollers. Further, a plurality of cooling rolls of the fourth cooling roll, the fifth cooling roll, the ..., the nth cooling roll (n is a natural number) may be disposed after the third cooling roll 7 and The film wound on the third cooling roll 7 is sequentially wound on the next cooling roll. The resin sheet is usually in the form of a sheet or a film and has a thickness of usually 0.1 to 3 mm, preferably 0.1 to 2 mm, more preferably 0.1 to 1 mm, and still more preferably 0.1 to 1 mm. Since the resin sheet is composed of an acrylic resin layer and a polycarbonate resin layer, it is difficult to be broken and the thickness can be reduced. In the resin sheet, the thickness of each layer of the polycarbonate resin layer laminated on both surfaces of the acrylic resin layer is preferably 0.1 mm or less, more preferably 0.005 to 0.1 mm, and still more preferably 0.01 to 0.1 mm. Good for 〇. 0 5 ~ 0 · 1 mm. When the thickness of the polycarbonate resin layer is too large, when the liquid crystal display provided with the touch panel using the resin plate in the lower electrode substrate is viewed from the oblique direction, the display image of the liquid crystal display is colored. On the other hand, when the thickness of the polycarbonate resin layer is too small, the resin sheet is liable to be broken. Further, the thickness of each of the polycarbonate resin layers laminated on both surfaces of the acrylic resin layer may be the same or different. The thickness of the acrylic resin layer is preferably adjusted as appropriate from the entire thickness of the resin sheet and the thickness of the polycarbonate resin layer, but is preferably 70 to 99% of the entire thickness of the resin sheet. The Re (50) of the resin sheet is preferably 9 Å or less, more preferably 80 nm or less, and still more preferably 70 nm or less. By setting Re ( 50 ) to 9 〇 nm to 16-201247405, it is possible to suppress the display image of the liquid crystal display when viewing the liquid crystal display provided with the touch panel using the resin plate in the lower electrode substrate from the oblique direction. Coloring. Further, Re (50) is a hysteresis when the monochromatic light having a wavelength of 590 nm is incident at an angle of 50 with respect to the normal line of the resin plate surface. The Re(0) of the resin sheet is preferably 50 nm or less, more preferably 47 nm or less and still more preferably 45 nm or less. When Re (0) is too large, when the liquid crystal display provided with the touch panel using the resin plate in the lower electrode substrate is viewed from the front direction, the display image of the liquid crystal display is colored. When the contact panel is 5 〇 nm or less, the color of the display image when the touch panel is viewed from the front side can be suppressed. Further, Re (0) is a normal light for making a monochromatic light having a wavelength of 590 nm with respect to the normal surface of the resin plate surface. The hysteresis of the angle of incidence is 値. The resin plate suppresses the coloration of the display image of the liquid crystal display when viewing the screen of the touch panel from the oblique direction, and Re(0) and Re(50) preferably satisfy the formula: I Re(0)-Re( 50) 丨/50$ 1.6. In the formula, 丨Re(0)-Re(50)丨/50 is more preferably 1.4 or less and more preferably 1.2 or less. By satisfying the relationship of the above formulas by Re(〇) and Re(50), it is possible to further suppress the display of the liquid crystal display when the liquid crystal display provided with the touch panel using the resin sheet in the lower electrode substrate is viewed from the oblique direction. The color of the image. Re(0)-Re(50)| /50 is a hysteresis of 50 when a monochromatic light having a wavelength of 590 nm is incident at an angle of 〇 with respect to a normal line of a resin plate surface. The rate of change of the hysteresis 入射 at the angle of incidence, when the rate of change exceeds 1.6, the display image is colored when the contact panel is viewed from the front, and the color of the display image when viewed from the oblique direction at -17-201247405 The color difference becomes larger, and the color of the displayed image is more emphasized and recognized. When the above formula is satisfied, for example, a film material having a polycarbonate resin layer is melt-extruded from both sides of the acrylic resin layer from the nozzle, and is sandwiched between the first cooling roll and the second cooling roll, and wound. The resin sheet can be produced on the second cooling roll, and the first cooling roll is a metal elastic roll from the viewpoint of making the 丨Re (0)-Re (50) | /50 smaller. The two cooling rolls are metal rolls. Alternatively, an oxygen third cooling roller may be disposed after the second cooling roller, and then a fourth cooling roller, a fifth cooling roller, ..., the nth cooling roller may be disposed after the third cooling roller. (η is a natural number) of the plural number of rollers. A resin sheet having a polycarbonate resin layer on both sides of the acrylic resin layer, Re(0) and Re(50) satisfying the formula: 丨Re (0) - R e (5 0) 丨 / 5 0 S 1.6 resin Since the plate has a monochromatic light having a wavelength of 5 to 90 nm with respect to the normal of the surface of the resin plate, the hysteresis at the angle of 〇° and the rate of change of the hysteresis at the angle of 5 (the angle of incidence of Γ are within a specific range, When the resin sheet is viewed from the front direction and the color difference is small when viewed from the oblique direction, it can be used for various display members, for example, a surface protection panel for a liquid crystal display or a surface protection panel for a touch panel. At least one side of the resin sheet may have a rough surface having a concave-convex shape. When at least one surface of the resin sheet is a matte surface, the matte surface is preferably a surface on the liquid crystal panel side, that is, a surface on which the transparent electrode film is not formed. The obtained resin sheet of the present invention is preferably used as a lower electrode substrate of a contact panel. When a resin sheet is used as the lower electrode substrate, the resin sheet is first cut into a necessary size, and then, on one side of the resin sheet - 18- 201247405 The transparent electrode film is formed to form a lower electrode plate. The transparent electrode film is made of a metal oxide. The metal oxide is exemplified by, for example, yttrium (tin-tin oxide) or ITO (indium-tin oxide), and the like. The transparency of the transparent electrode film is preferably from 5 to 50 μm. The method for producing the transparent electrode film is, for example, a vacuum deposition method, a sputtering method, an ionization vapor deposition method, a CVD method, or the like. From the viewpoint of improving the adhesion between the resin sheet and the transparent electrode film, a resin layer may be provided on one surface of the transparent electrode film formed on the resin sheet. The resin constituting the resin layer is preferably a resin having excellent transparency. It is preferably from 1 nm to 5 μm. When the thickness is less than 1 nm, the effect of improving the adhesion is not obtained. When the thickness is less than 5 μm, the liquid crystal display provided with the contact panel using the resin plate in the lower electrode substrate is viewed from the oblique direction. When there is a coloration of the display image of the liquid crystal display, the resistive film type contact panel is such that the upper electrode plate and the lower electrode plate are passed through the spacer, so that The transparent electrode films of the electrode plates are arranged to face each other in such a manner as to face each other. When the contact panel is mounted on the liquid crystal display, the lower electrode plate is placed in contact with the liquid crystal panel. The upper electrode plate is attached to the upper portion. A transparent electrode film is formed on one surface of the electrode substrate. The resistive film type touch panel is electrically connected to the lower electrode plate by pressing the upper electrode plate to detect the pressed position, so the upper electrode substrate preferably has From the viewpoint of the flexibility, the thickness of the electrode substrate of the upper -19-201247405 is preferably from 10 to 400 μϊη. As for the upper electrode substrate, a resin film excellent in transparency is used, and polyparaphenylene is usually used. Further, the resin sheet of the present invention may be used on the upper electrode substrate, or the two substrates of the upper electrode substrate and the lower electrode substrate may be used as the resin sheet of the present invention. In this case, the thicknesses of the resin sheets constituting the two substrates may be the same as or different from each other. The resin plate is not limited to the use of a lower electrode substrate as a resistive film contact panel, and an electrode substrate which is a contact panel of another type of detection may be used. For example, an electrode substrate which is a capacitive contact panel may be used. The capacitive contact panel is formed by forming a protective film on a transparent electrode film of an electrode plate having a transparent electrode film on one surface of an electrode substrate. When a capacitive contact panel is provided on a liquid crystal display, the surface of the electrode substrate is placed in contact with the liquid crystal panel. As the electrode substrate, a glass plate is usually used, but the slab is heavy and has a problem of being easily broken. Therefore, the problem can be improved by using the resin sheet of the present invention instead of the glass sheet. The use of the touch panel is exemplified by a display window of a portable game machine, a display of a portable car navigation system or a portable information terminal, a display of a bank ATM, an operation panel of an industrial machine, and the like. Since the resin plate of the present invention is used as the contact panel of the lower electrode plate, since the lower electrode substrate is a resin plate of the present invention, it is lightweight, and since it is not easily broken, the contact type can be made thin by the thickness of the resin plate. The invention is not limited to the embodiments. The present invention is not limited to the embodiments. The composition of the extrusion apparatus used in the following examples and comparative examples was as follows. • Extruder 1: An extruder having a spiral diameter of 65 mm and a single shaft and an additional vent (manufactured by Toshiba Machine Co., Ltd.) was used. • Extruder 2: An extruder with a spiral diameter of 4 5 mm and a single shaft and additional vent (manufactured by Hitachi Shipbuilding Co., Ltd.). • Feed bushing 3: Two types of three-layer distribution type feed bushings (manufactured by 造立造船). Mouthpiece 4: A T-die with a lip width of 1 400 mm and a lip gap of 1 mm (made by 造立造船). First, second, and third cooling rolls 5, 6, and 7: A horizontal type, 1400 mm long, and 300 mm ηφφ cooling rolls were used. For the first, second, and third cooling rolls 5, 6, and 7, more specifically, the first cooling roll 5 uses a metal elastic roll. This metal elastic roller is a roller in which a metal film ' is disposed so as to cover the outer peripheral surface of the shaft roll, and a fluid is sealed between the shaft roll and the metal film. The shaft roll, the metal film and the flow system are as follows. Shaft roller: made of stainless steel. Metal film: Stainless steel mirror metal sleeve with a thickness of 2 mm. Fluid: Oil, which is controlled by temperature, makes the metal elastic roller a temperature controllable. More specifically, it is possible to control the temperature by heating and cooling the oil by the switching control of the temperature controller, and to circulate between the shaft roller and the metal film. The second and third cooling rolls 6, 7 are made of a highly rigid metal roll. The metal roller is a stainless steel spiral roller having a mirror surface. The resins used in the examples and comparative examples were the following two types. • Resin 1 : Polycarbonate resin “CALIBER 301-10” manufactured by Sumitomo Dow (shares) at a heat distortion temperature (Th) of 14 〇t. • Resin 2: methacrylic resin “SUMIPEXEX” manufactured by Sumitomo Chemical Co., Ltd. (100°C) at a heat distortion temperature (Th). [Examples 1 to 4 and Comparative Example 1] <Preparation of Resin Plate> First, as shown in Fig. 1, an extruder 1, 2, a feed sleeve 3, a die 4, first, second, and third were disposed. Cooling rolls 5, 6'7. Then, the resin of the type shown in Table 1 of the resin layer A was melt-kneaded by the extruder 1, and the resin of the enamel type shown in Table 1 of the resin layer B was melt-kneaded by the extruder 2, and supplied to the feed sleeve separately. The resin layer B supplied from the extruder 2 to the feed sleeve is laminated on the film-shaped molten resin from the die 4 which is supplied from both sides of the feed sleeve resin resin layer A from the extruder 1 Extrusion d Next, the film-like molten resin extruded from the die tip 4 is sandwiched between the first cooling roll 5 and the second cooling roll 6 disposed oppositely, and then wound on the third cooling roll 7 and After molding and cooling, a resin plate having a three-layer thickness of the laminated resin layer B on both surfaces of the resin layer A having the thickness shown in Table 1 was obtained. Each of the layers -22 to 201247405 of the laminated resin layer B on both sides of the resin layer A in each of the obtained resin sheets was the same as each other. Further, "thickness" in the extruder 1 in Table 1 indicates the thickness of the resin layer, and "thickness" in the yielding machine 2 indicates the thickness "thickness" of the resin layer 8 indicates the total thickness of the obtained resin sheet. <Evaluation> The coloring of the retardation 値 and the self-oblique direction was evaluated for each of the obtained resin sheets. The evaluation methods are listed below. The results are shown in Table 1. [Residual 値 (Re(0), Re(50))]] Using the automatic birefringence KOBRA-WR" manufactured by the prince measuring machine (stock), the monochromatic light with a wavelength of 590 nm is measured relative to the normal of the tree. Hysteresis at the angle of 〇° (Re(0)) Hysteresis (Re(50)) when incident at an angle of 50°. Next, the sum of Re and (50) is obtained (| Re(0)-Re(50) | /50). [Coloring when viewed from the oblique direction] The following evaluation was made assuming that the contact panel was placed on a liquid crystal display using the obtained resin sheet as the electrode base under the contact panel. First, one surface of the resin sheet obtained above is overlapped with the first polarized light. Next, the square polarizing plate having the polarizing axis orthogonal to the first polarizing plate is superposed on the other surface of the resin plate. The first and second partial 3 use the "SUMIKARAN SG" manufactured by Sumitomo Chemical Co., Ltd., the "total timepiece" of the A, and the Re (0), and one of the first plates will be -23-201247405. The light of "LUPICA-S" manufactured by a three-wavelength fluorescent lamp (Mitsubishi Electric) is irradiated to the second polarizing plate in the direction of the second polarizing plate at an angle of 45 degrees, and the other side of the second deflecting plate is passed through Visually observe whether the surface sees the coloring basis as follows. 〇: coloring was not observed X: coloring was observed [Comparative Example 2] The resin of the type shown in Table 1 was melt-kneaded by the extruder 1 and fed into the feed sleeve 3 and the die 4. Next, the single-layered plate of the thickness shown in the first cooling roll 5 and the second direction is placed between the opposing first cooling rolls 5 and then wound on the third cooling roll 7. With respect to the obtained single-layered sheet, the coloring when viewed in the oblique direction was evaluated in the same manner as in the first embodiment. The results are shown in Table 1 ° OSRAM (the surface of the surface, the tree is viewed from the light plate. Also, the judgment, and the sequential supply of the melted cooling rolls 6 are obtained with a hysteresis and from -24-201247405
I _ 表 rL |ς·Ν 皿睡 〇 0 o o X X 1 Re<0)-Re(50) | /50 5 OJ o CO d GC> 卜· r*· <〇 〇j Re(50> <nm) r-* OD CO CO <〇 CO 〇 (〇 <〇 σ> 247 Re(O) (nm) GO CO 〇> r·· o CM CSI Τ'* 115 總厚度 (jum) 〇 to 800 1200 1500 800 800 擠出機2 厚度 <Mm) 80/80 80/80 80/80 80/80 90/90 1 樹脂層日 7— T~ CM 1 • 擠出機1 厚度 <Mm) 340 640 1040 1340 620 800 1, 樹脂層A CM CM CM CSJ r— r— 實施例1 實施例2 實施例3 實施例4 比較例1 比較例2 -25- 201247405 【圖式簡單說明】 圖1爲顯示本發明一實施形態之該下部電極基板用樹 脂板之製造方法之槪略說明圖。 【主要元件符號說明】 1、2 :擠出機 3 :饋料套管 4 :模嘴 5 :第一冷卻輥 6 :第二冷卻輥 7 :第三冷卻輥 8 :樹脂板 -26-I _ Table rL | ς·Ν 〇 〇 0 oo XX 1 Re<0)-Re(50) | /50 5 OJ o CO d GC> Bu·r*· <〇〇j Re(50>< Nm) r-* OD CO CO <〇CO 〇(〇<〇σ> 247 Re(O) (nm) GO CO 〇> r·· o CM CSI Τ'* 115 total thickness (jum) 〇to 800 1200 1500 800 800 Extruder 2 Thickness <Mm) 80/80 80/80 80/80 80/80 90/90 1 Resin layer day 7—T~ CM 1 • Extruder 1 thickness <Mm) 340 640 1040 1340 620 800 1, Resin layer A CM CM CM CSJ r- r - Example 1 Example 2 Example 3 Example 4 Comparative example 1 Comparative example 2 -25- 201247405 [Simplified illustration] Figure 1 shows A schematic view of a method of manufacturing the resin sheet for a lower electrode substrate according to an embodiment of the present invention. [Explanation of main component symbols] 1, 2: Extruder 3: Feed bushing 4: Mold nozzle 5: First cooling roller 6: Second cooling roller 7: Third cooling roller 8: Resin plate -26-