200904860 (1) 九、發明說明 【發明所屬之技術領域】 本發明係關於可提供光擴散性等優異之光擴散成型品 的異形粒子、異形粒子組成物及其製造方法及光擴散性等 優異之光擴散成型品。 【先前技術】 目前電視、個人電腦等的顯示裝置使用液晶顯示裝 置。此液晶顯示裝置具備：光源、配設於此光源附近及被 照射的導光板、依序配設於此導光板前方的光擴散板、稜 鏡片及液晶顯示面板。配設在導光板前方的光擴散板係用 於使通過導光板的光被更均勻擴散。藉由改良此光擴散板 特性，試圖提高液晶顯示裝置的亮度。 相關的先前技術揭示使用將平均粒徑及粒徑分布的變 動係數（CV値）設定在所定範圍內之光擴散性樹脂粒子 的光擴散板（例如參照專利文獻1 )。 但是即使使用一種利用專利文獻1所記載之光擴散性 樹脂粒子的光擴散板時，也不一定能充分提高液晶顯示裝 置的亮度，而希望進一步的改良。具體而言，要求開發一 種光透過性及光擴散性良好，更高亮度的光擴散板。爲了 滿足此要求，而揭示使用將平均粒徑及平均粒徑分布設定 在指定範圍內之合成樹脂粒子的光擴散板（例如參照專利 文獻2 )。 但是即使使用此專利文獻2所記載之合成樹脂粒子的 200904860 (2) 光擴散板，其光透過性及光擴散性仍有改良的餘地，希望 開發更高特性的光擴散成型品、及能製造該光擴散成型品 的材料。 [專利文獻1 ]日本特開平7 - 2 3 4 3 0 4號公報 [專利文獻2]日本特開2004-226604號公報 【發明內容】 [發明之揭示] 本發明係有鑒於這種先前技術所具有的問題點而完成 者’其課題係提供：可提供光透過性及光擴散性優異的光 擴散成型品的異形粒子，異形粒子組成物及其製造方法， 以及光透過性及光擴散性優異的光擴散成型品。 本案發明人等爲了達成上述課題，而精心檢討結果發 現藉由使用由二種以上之粒子所構成之數平均粒徑在指定 數値範圍內的異形粒子’可達成上述課題，遂完成本發 明。 即，依據本發明時，可提供以下所示之異形粒子、異 形粒子組成物及其製造方法及光擴散成型品。 [1]一種異形粒子，其特徵係具有：由含有 (al)芳香族乙烯基系單體單元60〜98質量％、 (a2)含有極性官能基之單體單元2〜4〇質量％及 (a3)其他之單體單元〇〜38質量％ (但是（al) + (a2) + (a3) =1〇〇質量％)之第一聚合物所構成的（a) 粒子與由含有 -6- 200904860 (3) (bl)芳香族乙烯基系單體單元〇〜25質量％、 (b2)含有極性官能基之單體單元75〜100質量％及 (b3)其他之單體單元0〜25質量％ (但是（bl) + (b2) + ( b3) =100質量％)之以突起狀配置於前述（a) 粒子表面之至少一部分之第二聚合物所構成的（b)粒 子’其整體形狀爲前述（a)粒子與前述（b)粒子各自之 一部分至少互相接觸或重疊所形成的雪人形狀，且其數平 均粒子徑爲0.8〜ΙΟμιη。 [2] 如上述[1]項之異形粒子，其中該（a)粒子之數平 均粒子徑（La )與該（b )粒子之數平均粒子徑（Lb )之 比爲(La) / ( Lb) =0.05 〜20.0。 [3] 如上述或[2]項之異形粒子，其中該（a)粒子爲 種子聚合物粒子，使用構成該（bl)芳香族乙烯基系單體 單元、（b2)含有極性宫能基之單體單元及（b3)其他之 單體單元之各自之單體之至少一種，藉由種子聚合所形 成。 [4] 一種異形粒子組成物，其特徵係含有（A)上述π] 〜[3]項中任一項之異形粒子及（Β)黏結劑成分。 [5] —種異形粒子組成物之製造方法，其特徵係具有： 由含有上述[1]〜[3]項中任一項之異形粒子之乳膠中去除 溶劑，得到乾燥狀態之該異形粒子的步驟， 將製得之該異形粒子與黏結劑混合的步驟。 [6] —種光擴散成型品’其特徵係由含有樹脂成分與上 述[Π〜[3 ]項中任一項之異形粒子之樹脂材料所構成（以 200904860 (4) 下稱爲「第一光擴散成型品」）。 [7] 如上述[6]項之光擴散成型品’其係導光板 '光擴 散板或光擴散膜。 [8] —種光擴散成型品，其特徵係具備：基材層及形成 於該基材層之至少一面上之由如上述[4]項之異形粒子組成 物所構成之光擴散層（以下稱爲「第11光擴散：成型 品」）。 [9] 如上述[8]項之光擴散成型品，其係導光板或光擴 散膜。 本發明之異形粒子具有可提供光透過性 '及光擴散性 優異之光擴散成型品的效果。 本發明之異形粒子組成物具有可提供光透過性、及光 擴散性優異之光擴散成型品的效果。 依據本發明之異形粒子的製造方法時’可製造可提供 光透過性、及光擴散性優異之光擴散成型品的異形粒子組 成物。 本發明之第一及第二光擴散成型品係具有光透過性及 光擴散性優異的效果者。 [實施發明之最佳形態] 以下說明本發明實施之最佳形態，但是本發明不限於 &下實施形態，只要是不脫離本發明之要旨的範圍內，依 據熟習該項技術者之一般知識，對於以下實施形態加以適 當變更、改良等者也包括在本發明的範圍內。本說明書 -8- 200904860 (5) 中，「本發明（本實施形態）的光擴散成型品」係指第一 光擴散成型品及第二光擴散成型品中任一者。 1 .異形粒子： 本發明之異形粒子之一實施形態係具有：第一聚合物 所構成之（a )粒子與（a )粒子之表面之至少一部分配置 突起狀之第二聚合物所構成之（b)粒子，其整體形狀爲 前述（a)粒子與前述（b)粒子各自之一部分至少互相接 觸或重疊所形成之雪人形狀，其數平均粒子徑爲0.8〜10 μιη。以下詳細説明。 ((a)粒子） 本實施形態之構成異形粒子的（a )粒子係由第一聚 合物所構成者。此第一聚合物較佳爲可吸収含有水溶解度 爲1 (Γ 2質量％以下之有機化合物之油溶性聚合引發剤的種 子聚合物粒子。具體而言，例如有苯乙嫌系聚合物、苯乙 嫌-丁一嫌共聚物等之本乙嫌系聚合物或丙稀酸醋系聚合 物等。 構成（a )粒子之第一聚合物係含有作爲構成單位之 (al)芳香族乙烯基系單體單元（以下稱爲「構成單位 (al)」）、及（a2)含有極性官能基之單體單元（以下 稱爲「構成單位（a2)」）。必要時，可含有作爲構成單 位之（a3 )其他之單體單元（以下稱爲「構成單位 (a3 )」）。 -9- 200904860 (6) ((al)芳香族乙烯基單體單元） 構成構成單位（al)使用芳香族乙稀基系單體’例如 有苯乙烯、α -甲基苯乙烯、乙烯基甲苯、對甲基苯乙烯、 2 -甲基苯乙烯、3 -甲基苯乙烯、4 -甲基苯乙烯、4 -乙基苯 乙烯、4-第三丁基苯乙烯、3,4-二甲基苯乙烯、4 -甲氧基 苯乙烯、4-乙氧基苯乙烯、2-氯苯乙烯、3-氯苯乙烯、4-氯苯乙烯、2,4-二氯苯乙烯、2,6-二氯苯乙烯、4-氯-3-甲 基苯乙烯、二乙烯基苯、卜乙烯基萘、2_乙稀基啦卩定、4-乙烯基吡啶等。其中較佳爲苯乙烯、二乙烯基苯、α -甲基 苯乙烯。這些芳香族乙烯基系單體可單獨一種使用或可以 組合二種以上使用。 第一聚合物所含有之構成單元（al)之比例係當構成 單元（al)、構成單元（a2)及構成單元（a3)之合計爲 100質量％時，含有60〜98質量％’較佳爲65〜95質量 %，更佳爲7〇〜90質量％。第一聚合物所含有之構成單元 (a 1 )之比例未達6 0質量％時’光擴散性有變差的傾向。 而超過98質量％時，有時有不易得到異形粒子的傾向。 ((a2)含極性官能基之單體單元） 構成構成單元（a2 )所用之含極性官能基的單體係分 子中具有極性官能基的單體。此極性官能基例如有羧基、 氰基、羥基、縮水甘油基、酯基等。含極性官能基的單體 之具體例’如以下（1 )〜（5 )所示的單體。以下所例示 -10- 200904860 (7) 的單體係可單獨一種使用或以組合二種以上使用。 (1) 含羧基的單體：（甲基）丙烯酸、巴豆酸、桂 皮酸、馬來酸、馬來酸酐、富馬酸、伊康酸、伊康酸酐、 馬來酸單甲酯、馬來酸單乙酯、伊康酸單甲酯、伊康酸單 乙酯、六氫酞酸單-2·(甲基）丙烯醯氧基乙酯等之含羧基 的不飽和單體及其酸酐類。其中較佳爲（甲基）丙烯酸。 (2) 含氰基的單體：（甲基）丙烯腈、巴豆腈、桂 皮酸腈等的氰化乙烯基系單體；（甲基）丙烯酸2-氰乙 酯、（甲基）丙烯酸2-氰丙酯、（甲基）丙烯酸3-氰丙 酯。其中較佳爲（甲基）丙烯腈。 (3) 含羥基的單體：（甲基）丙烯酸羥甲酯、（甲 基）丙烯酸2-羥乙酯、（甲基）丙烯酸6-羥己酯、（甲 基）丙烯酸4-羥基環己酯、新戊二醇單（甲基）丙烯酸酯 等之單（甲基）丙烯酸羥基（環）烷酯類；（甲基）丙烯 酸3-氯-2-羥丙酯、（甲基）丙烯酸3-胺基-2-羥丙酯等的 單（甲基）丙烯酸取代羥基（環）烷酯類。其中較佳爲 (甲基）丙烯酸羥甲酯。 (4) 含縮水甘油基的單體：烯丙基縮水甘油基醚、 (甲基）丙烯酸縮水甘油酯、丙烯酸甲基縮水甘油基甲 酯、（甲基）丙烯酸環氧化環己酯。其中較佳爲（甲基） 丙烯酸縮水甘油酯。 (5) 含酯基的單體：（甲基）丙烯酸甲酯、（甲 基）丙烯酸乙酯、（甲基）丙烯酸丙酯、正己基（甲基） 丙烯酸酯' (甲基）丙烯酸2-乙基己酯' (甲基）丙烯酸 -11 - 200904860 (8) 環己酯等的（甲基）丙烯酸（環）烷酯類；（甲基）丙烯 酸2-甲氧基乙酯、（甲基）丙烯酸對甲氧基環己酯等的 (甲基）丙烯酸烷氧基（環）烷酯類；三羥甲基丙烷三 (甲基）丙烯酸酯等的多價（甲基）丙烯酸酯類；醋酸乙 烯酯、丙酸乙烯酯、淑碳酸（versatic acid)乙烯酯等的 乙烯酯類。其中較佳爲（甲基）丙烯酸甲酯。 第一聚合物中所含有的構成單元（a2 )之比例係構成 單元（al)、構成單元（a2)及下述構成單元（a3)之合 計爲100質量％時，含有2〜40質量％，較佳爲4〜35質 量％，更佳爲8〜30質量％。第一聚合物中所含有的構成 單元（a3 )之比例未達2質量％時，有難以得到異形粒子 的傾向。而超過40質量％時，光透過性有變差的傾向。 (其他單體單元） 第一聚合物中，視需要可含有可與前述各種單體共聚 之其他單體所構成的單體單元（也稱爲構成單元 (a3 ))。構成此構成單元（a3 )的其他單體，例如有以 下所示者。 N-羥甲基（甲基）丙烯醯胺、N，N-二羥甲基（甲基） 丙烯醯胺等的N-羥甲基化不飽和羧醯胺類：2-二甲胺基乙 基丙烯醯胺等的含胺烷基的丙烯醯胺類；（甲基）丙烯醯 胺、N-甲氧基甲基（甲基）丙烯醯胺、N，N-乙烯撐雙（甲 基）丙烯醯胺、馬來醯胺、馬來醯亞胺等之不飽和羧酸的 醯胺類或醯亞胺類；N_甲基丙烯醯胺' N，N-二甲基丙烯醯 -12 - 200904860 (9) 胺等的N-單烷基（甲基）丙烯醯胺、N，N_二烷基丙烯醯 胺類；（甲基）丙烯酸2-二甲胺基乙酯等的含胺烷基的 (甲基）丙烯酸酯類；（甲基）丙烯酸2·(二甲胺基乙氧 基）乙酯等的含胺基烷氧基烷基的（甲基）丙烯酸酯類； 氯乙烯、偏二氯乙烯、脂肪酸乙烯酯等之_化乙烯基化合 物類；1,3-丁 二烯、2-甲基-1,3-丁 二烯、2-氯-1,3-丁二 烯、2,3-二甲基-1,3-丁二烯等的共軛二烯化合物類。 第一聚合物中所含有的構成單元（a3)之比例係構成 單元（al)、構成單元（a2)及構成單元（a3)之合計爲 100質量％時，含有0〜38質量％，較佳爲0〜30質量％， 更佳爲〇〜20質量％。 ((b )粒子） 本實施形態之構成異形粒子的（b )粒子係由第二聚 合物所構成者。此第二聚合物係含有作爲構成單元之 (b2)含極性官能基的單體單元（以下也稱爲「構成單元 (b2)」）。第二聚合物係含有（bl)芳香族乙烯基系單 體單元（以下也稱爲「構成單元（bl)」）、及必要時含 有（b3)其他單體單元（以下也稱爲「構成單元 (b 3 )」）作爲構成單元者。 ((bl)芳香族乙烯基系單體單元） 作爲構成構成單元（b 1 )用之芳香族乙烯系單體，例 如與構成前述構成單元（al)所用之芳香族乙烯系單體相 -13- 200904860 (10) 同者。其中較佳爲苯乙烯、二乙烯基苯、α_甲基苯乙稀。 這些芳香族乙烯系單體係可單獨一種使用或組合二種以上 來使用。 第二聚合物中所含有的構成單元（bl)之比例係構成 單元（bl)、構成單元（b2)及構成單元的合計爲 100質量％時，含有0〜25質量％，較佳爲1〇〜2〇質量 % ’更佳爲2 0〜1 5質量％。第二聚合物中所含有的構成單 兀（bl)之比例若超過25質量。/。時，光透過性有變差的傾 向。 ((b2 )含極性官能基的單體單元） 構成構成單元（b 2 )所用之含極性官能基的單體係分 子中具有極性官能基的單體。此極性官能基例如有殘基、 氰基、經基、縮水甘油基 '酯基等。含極性官能基之單體 的具體例，例如與前述構成構成單元（a2 )所用之含極性 官能基的單體相同者。其中較佳爲含酯基的單體，更佳爲 (甲基）丙烯酸甲酯等的（甲基）丙烯酸（環）烷酯類、 二甘醇二（甲基）丙烯酸酯、三羥甲基丙烷三（甲基）丙 烯酸酯等的多價（甲基）丙烯酸酯類。這些含極性基的單 體可單獨一種使用或組合二種以上使用。 第二聚合物中所含有的構成單元（b 2 )之比例係構成 單元（bl)、構成單元（b2)及下述構成單元（b3)的合 計爲1 00質量。/〇時，含有75〜1 00質量％，較佳爲75〜95 質量％ ’更佳爲8 0〜9 0質量％。第二聚合物中所含有的構 -14- 200904860 (11) 成單元（b3 )之比例未達75質量％時，光透過性有變差的 傾向。 (其他單體單元） 第二聚合物中，視需要可含有由可與前述各種單體共 聚之其他單體所成的單體單元（也稱爲構成單元 (b3 ))。構成此構成單元（b3)之其他單體例如有可與 前述構成構成單元（a3)所用之其他單體相同者。第二聚 合物中所含有的構成單元（b3)之比例係構成單元 (bl)、構成單元（b2)及構成單元（b3)的合計爲1〇〇 質量％時，含有0〜25質量％，較佳爲0〜20質量％，更佳 爲0〜1 5質量％。 (異形粒子） 本實施形態之異形粒子係具有（a )粒子與（b )粒子 者。又，（b)粒子係以突起狀配置於（a)粒子表面之至 少一部分。本說明書中所謂的「異形」係指將本發明之一 實施形態之異形粒子以通過該（a )粒子之中心與（b )粒 子之中心的面切断後之断面之（a)粒子與（b)粒子之中 心間距離爲（a )粒子之半徑與（b )粒子之半徑之和以下 的形狀。換言之，本實施形態之異形粒子的形狀係於 (a )粒子表面上局部存在著（b )粒子的形狀或於（b ) 粒子表面局部存在著（a)粒子的形狀。（a)粒子與 (b)粒子均實質上整合存在於單一區域，同時對於異形 -15- 200904860 (12) 粒子整體之中心点’爲非對稱配置。本實施形態之異形粒 子係與芯部未露出於粒子表面之以往之芯殼粒子不同， (a)粒子與（b)粒子均露出於表面。本實施形態之異形 粒子之整體形狀係（a)粒子與（b)粒子各自之一部分至 少互相接觸或重疊所形成之雪人形狀（或西洋梨形狀、葫 蘆形狀），較佳爲其中央部或中央部附近有頸縮部的形 狀。具有這種雪人形狀（或西洋梨形狀、葫蘆形狀）之 「異形」的具體例如圖1 ( A )所示的形狀。 本實施形態之異形粒子中，第一聚合物的組成與第二 聚合物的組成可相同或不同，但也較佳爲第一聚合物所含 有之單體單元中至少一種與第二聚合物所含有之單體單元 不同。換言之，此時構成異形粒子之單體單元中至少一種 僅包含於第一聚合物與第二聚合物中任一的聚合物中。藉 此例如可使（a )粒子與（b )粒子成非對稱分離。 本實施形態之異形粒子之長徑的數平均値（L )與短 徑的數平均値（D )之比爲（L ) / ( D ) =1.0〜2.0，較佳 爲1.1〜1.9，更佳爲1.2〜1.8。 （L) / (D)的値超過2.0 時，對黏結劑成分之分散性會降低，有難以得到均勻之光 擴散機能的傾向。 此處說明異形粒子爲如圖1 ( A )所示具有球狀突起 的球狀時之「長徑」及「短徑」。如圖2所示’長徑 (L )係表示從（a )粒子1之端部至（b )粒子2之端部 的距離。又，短徑（D)表示粒子中，較大粒子（圖2中 爲（a)粒子1 )的直徑。 -16- (13) (13)200904860 本實施形態之異形粒子係（a )粒子的數平均粒徑 (La )與（b )粒子的數平均粒徑（Lb )之比爲（La ) / (Lb) =0.05〜20.0，較佳爲 0.2〜18，特佳爲 0.4〜15。 但是本實施形態之異形粒子係因（a )粒子與（b )粒子之 粒徑不同，因此無（La ) / ( Lb ) =1的情形。（La ) / (Lb )之値未達0.05時，光透過性及光擴散性之平衡有 顯著變差的傾向。而（La) / (Lb)的値若超過20_0時， 光透過性及光擴散性的平衡也有顯著變差的傾向。粒子的 形狀非真球形狀，而是所謂的扁平形狀等時，以長徑與短 徑的平均値作爲「平均粒徑」。 本實施形態之異形粒子係（a )粒子的折射率（Ra ) 與（b )粒子的折射率（Rb )之比較佳爲（Ra ) / ( Rb ) = 0.7 〜1.4，更佳爲 0.8 〜1.3,特佳爲 0.85 〜1.25。（Ra)/ (Rb )的値未達0.7時，有難以得到異形粒子的傾向。而 (Ra) / ( Rb )的値若超過1.4時，也難以得到異形粒子的 傾向。折射率係以下述方法所測定之値。 折射率測定：（1 )將成爲測定對象的粒子在80°C進 行24小時乾燥後，經粉碎，以60網目之金屬網過濾，調 製試驗樣品（乾燥一次粒子）。（2 )將調製之乾燥一次 粒子與適當折射率之折射率標準液（CargilU公司製）予 以混合，調製一次粒子分散液。（3 )以顯微鏡觀察所調 製之一次粒子分散液，確認是否可辨識一次粒子之輪廓部 分，以不能辨識時之折射率標準液之折射率作爲該粒子的 「折射率」。 -17- (14) (14)200904860 本實施形態之異形粒子係第一聚合物及/或第二聚合 物具有一種以上之反應性官能基時，有容易保持良好之聚 合安定性的傾向’故較佳。此「反應性官能基」例如有醋 基、醯胺基 '胺基、羧基、磺酸基、硫酸基 '縮水甘油 基、羥基。具有反應性官能基的聚合物係對於酯基、醯胺 基、胺基、殘基、縮水甘油基及羥基，例如將具有這些反 應性官能基之單體共聚，或使具有這些反應性官能基之 化合物進行接枝製得。又，關於具有擴酸基的聚合物，例 如在具有擴酸基的反應性界面活性劑的存在下，使單體聚 合而製得。又，關於具有硫酸基的聚合物，例如使用過硫 酸鉀等的引發劑，使單體聚合而製得。第一聚合物及/或 第二聚合物中所含有之反應性官能基的量係換算成導入此 反應性官能基時所用的化合物，各聚合物較佳爲〇. 5〜5 0 質量％，更佳爲2〜3 0質量％。 (異形粒子的製造方法） 本實施形態之異形粒子，例如可依照以下所示的方法 來製造。首先，第一聚合物所構成之（a)粒子係可藉由 使用水性介質之一般乳化聚合方法製得。此「水性介質」 係指以水爲主成分的介質。具體而言，此水性介質中之水 的含有率較佳爲40質量％以上，更佳爲5 0質量％以上。 可與水倂用之其他介質例如有醋類、酮類、酣類、醇類等 的化合物。 乳化聚合之條件可依照習知的方法。例如，使用之單 -18- 200904860 (15) 體的總量爲100份時，通常使用100〜5 00份的水，可在 聚合溫度爲-10〜100°c (較佳爲-5〜100 °c，更佳爲 〇〜 90°C )、聚合時間爲0.1〜30小時（較佳爲2〜25小時） 的條件下進行乳化聚合。乳化聚合的方式可採用將單體一 次投入的分批方式，將單體分批或連續供給的方式，將單 體之預乳膠分批或連續添加的方式，或將這些方式以階段 性組合的方式等。又，必要時，可使用一種或二種以上之 —般乳化聚合時所用的分子量調節劑、螯合化劑、無機電 解質等。 乳化聚合時使用引發劑時，此引發劑可使用過硫酸 鉀、過硫酸銨等的過硫酸鹽；苯甲醯基過氧化物、月桂醯 基過氧化物、第三丁基過氧-2-乙基己酸酯等的有機過氧化 物；偶氮雙異丁腈、二甲基- 2,2’·偶氮雙異丁酸酯、2-胺 甲醯基氮雜異丁腈等的偶氮化合物；含有具過氧化基之自 由基乳化性化合物的自由基乳化劑、亞硫酸氫鈉及硫酸亞 鐵等之還原劑所組合成的氧化還原系等。又，使用乳化劑 時，此乳化劑可使用選自由習知之陰離子性乳化劑、非離 子性乳化劑及兩性乳化劑所成族之一種以上。也可使用分 子內具有不飽和雙鍵的反應性乳化劑等。 乳化聚合所使用的分子量調節劑無特別限制。分子量 調節劑之具體例，例如正己基硫醇、正辛基硫醇、正癸基 硫醇、三級十二基硫醇、正十六基硫醇、正十四基硫醇、 三級十四基硫醇、硫醇酸等的硫醇類；二甲基乙黃原醯二 硫化物、二乙基乙黃原醯二硫化物、二異丙基乙黃原醯二 -19- (16) (16)200904860 硫化物等的乙黃原醯二硫化物類；四甲基秋蘭姆二硫化 物、四乙基秋蘭姆二硫化物、四丁基秋蘭姆二硫化物等的 秋蘭姆二硫化物類；氯仿、四氯化碳、四溴化碳、溴乙烯 等的鹵化烴類；五苯基乙烷、α-甲基苯乙烯二聚物等的烴 類；丙烯醛、甲基丙烯醛、烯丙醇、2 -乙基己基硫醇酯、 蔥品油烯' α-萜品烯、γ_萜品烯、雙戊烯、υ-二苯基乙 烯等。這些分子量調節劑可單獨一種使用或組合二種以上 使用。這些中硫醇類、乙黃原醯二硫化物類、秋蘭姆二硫 化物類、1，1-二苯基乙烯、α -甲基苯乙烯二聚物等更適 用。 乳化聚合結束時之單體的聚合轉化率較佳爲8 〇質量％ 以上，更佳爲90質量％以上’特佳爲95重量％以上。第 一聚合物之聚合添加率未達80質量％的狀態下，投入第二 聚合物用之單體時’形成的（a)粒子與（b)粒子變成難 以明確分離。由製得之第一聚合物所構成的（a)粒子通 常爲球狀粒子。（a)粒子之數平均粒徑較佳爲os〜1〇 μηι，更佳爲ι·〇〜10μη1。（a)粒子的數平均粒徑在此範 圍外時’有時難以乳化聚合來製造。 製得之（a)粒子的存在下，使第二聚合物用的單體 聚合。更具體而言’以製得之（a)粒子作爲種子聚合物 粒子使用的狀態下’藉由使第二聚合物用的單體進行種子 聚合’形成（b )粒子’可製得本實施形態的異形粒子。 例如’可將第二聚合物用單體或其預乳膠以一次、分批或 連續滴於分散有（a )粒子的水性介質中。此時使用之 -20- 200904860 (17) (a )粒子的量係對於第二聚合物用單體1 00質量份時， 較佳爲1〜100質量％，更佳爲2〜80質量％。聚合時使用 引發劑或乳化劑時，可使用與製造（a )粒子時相同者。 又，聚合時間等的條件可與製造（a )粒子時相同。 分散有（a)粒子之水性介質中，投入第二聚合物用 單體時，如圖3(A)所示，投入之第二聚合物用單體的 大部分通常一旦被（a)粒子所吸藏，此（a)粒子中或其 表面開始聚合。此第二聚合物用單體係隨著聚合之進行而 降低對第一聚合物的相溶性，與第一聚合物產生相分離。 因此，聚合初期可在（a)粒子之多處進行聚合，但是構 成各聚合物之單體單元滿足目前爲止所述的關係時，第二 聚合物在（a)粒子之各處所聚合者互相集結，形成單一 之（b )粒子的傾向（圖3 ( B ) ) 。 （ b )粒子成長到某 程度的大小時，其後之聚合主要是以此（b )粒子來進行 (圖3(C))。如此形成（a)粒子與（b)粒子爲非對 稱分離之本實施形態的異形粒子。 如上述所得之本實施形態的異形粒子之數平均粒徑係 0.8〜ΙΟμηι，較佳爲1.0〜ΙΟμηι，更佳爲1.2〜ΙΟμιη。數平 均粒徑若大於1 〇μηι時，有時不易以乳化聚合法來製造。 又，若比0.8 μιη小時，光透過性與光擴散性的平衡差。本 實施形態之異形粒子之「數平均粒徑」係指異形粒子之對 於最長方向之直徑的長度，例如可藉由光散射法來測定。 本實施形態之異形粒子係（a )粒子與（b )粒子之質 量比（（a) /(b))較佳爲2/98〜98/2,更佳爲5/95〜 -21 - 200904860 (18) 95/5。又，異形粒子之全表面積中，（a)粒子所形成之 露出面與（b )粒子所形成之露出面的比例（面積比= (a) / (b))較佳爲 5/95 〜95/5，更佳爲 10/90 〜90/10。 (a )粒子與（b )粒子中任一者的比例若少於上述範圍 時，此異形粒子有時無法充分得到「異形」的效果。各一 次粒子之露出面佔異形粒子之全表面積的比例，例如可由 電子顯微鏡相片來測定。 異形粒子的形狀係因（a)粒子與（b)粒子的質量 比、（a )粒子與（b )粒子的分離性、形成（b )粒子時 之聚合條件等，而有各種變化。例如，（a )粒子與（b ) 粒子的質量比及聚合條件一定時，隨著（a)粒子與（b) 粒子之分離性升高，異形粒子的形狀有依圖1 ( B )、圖1 (C )、圖1 ( A )之順序變化的傾向。 2 .異形粒子組成物及其製造方法： 本發明之異形粒子組成物之一實施形態係含有前述 (A )異形粒子與（B )黏結劑成分者。以下詳細說明。 (B )黏結劑成分 本實施形態之異形粒子組成物中所含有的黏結劑成分 只要爲透明’同時例如可使（A )異形粒子在樹脂製之薄 片等之表面上分散成一體化者，其種類則無特別限定。黏 結劑成分之具體例，例如有聚醋酸乙烯酯、聚乙烯醇、聚 氯乙烯 '聚乙烯縮丁醛、聚（甲基）丙烯酸酯 '硝基纖維 -22- 200904860 (19) 素等的熱塑性樹脂；酚樹脂、三聚氰胺樹脂、聚酯樹脂、 聚胺基甲酸酯樹脂、環氧樹脂等的熱固性樹脂。這些黏結 劑成分可單獨一種使用或組合二種以上來使用。 黏結劑成分之全光線透過率較佳爲8 0%以上，更佳爲 90%以上。黏結劑成分之全光線透過率若爲80%以上時， 可製造光透過性更優異的光擴散成型品。本說明書中所謂 的「全光線透過率」係根據K 7 1 05所測定的値。 本實施形態之異形粒子組成物中所含有之（B)黏結 劑成分的比例係對於（A )異形粒子1 00質量份時，含有 1〜10000質量份，更佳爲2〜5000質量份，特佳爲3〜 1 〇〇〇質量份。（B )黏結劑成分的含有比例未達1質量份 時，例如（A)異形粒子在樹脂製之薄片等之表面上有難 以分散成一體化的傾向。另外，（B)黏結劑成分的含有 比例若超過1 〇〇〇〇質量份時，使用此異形粒子組成物所製 造之光擴散成型品的光透過性及光擴散性有難以提高的傾 向。 (其他成分） 本實施形態之異形粒子組成物中除了（ A )異形粒子 及（B )黏結劑成分外，視需要可含有硬化劑、分散劑、 染料等其他成分。 其他成分之含有比例係對於（A )異形粒子+( B )黏 結劑成分=1 〇 〇質量份時，較佳爲0〜〗〇質量份，更佳爲0 〜5質量份，特佳爲0〜3質量份。 -23- 200904860 (20) (異形粒子組成物的製造方法） 製造本實施形態之異形粒子組成物時，首 照前述異形粒子之製造方法所製得之異形粒子 去溶劑，得到乾燥狀態的異形粒子（步驟（1 驟（1 )中，關於從乳膠中除去溶劑的方法無 但是冷凍乾燥方法、噴霧乾燥方法，因爲可簡 狀態，因此較佳。 乾燥至溶劑之含有比例成爲5.0質量％以 燥至成爲3.0質量％以下更佳。溶劑的含有比召 質量％時，對黏結劑成分之分散性會降低，製 光擴散機能的成型品有困難的傾向。 其次，混合製得之乾燥狀態的異形粒子與 (步驟（2))。此步驟（2)中，異形粒子、 分以及視需要所添加之前述其他成分，藉由均 到本實施形態的異形粒子組成物。其他成分可 混合方法無特別限定，例如可使用各種混煉機 高壓均質混合機等混合。 3 .光擴散成型品 本發明之第一光擴散成型品係由含樹脂成 形粒子的樹脂材料所構成者。又，本發明之第 型品之一實施形態係具備基材層、及形成於此 少一面上之由前述異形粒子組成物所構成的光 先從含有依 的乳膠中除 ))。此步 特別限定， 單形成乾燥 下較佳，乾 1J若超過5.0 造具有均勻 黏結劑成分 及黏結劑成 勻混合可得 稍後混合。 、珠磨機、 分與前述異 二光擴散成 基材層之至 擴散層者。 -24- 200904860 (21) 詳細說明如下。 (第一光擴散成型品） 構成第一光擴散成型品的樹脂材料中含有樹脂成分與 前述異形粒子。此樹脂成分無特別限定，但較佳爲對可見 光線具有高透過性之透明者。透明包括無色透明以及有色 透明、半透明的槪念。 樹脂成分形成厚度200μιη的薄片時，波長5 5 0nm的 光線透過率爲80%以上者可使光擴散成型品之光透過性更 優異，更佳爲85%以上者，特佳爲90%以上者。又，若考 慮使用環境及保存環境等時，樹脂成分之玻璃轉化溫度較 佳爲l〇〇°C以上，更佳爲120°C以上，特佳爲150°C以上。 樹脂成分之具體例，例如有聚對酞酸乙二酯、聚甲基 (甲基）丙烯酸酯、聚碳酸酯、環烯烴聚合物、聚芳酯、 聚醚碾、聚苯乙烯、（甲基）丙烯酸甲酯-苯乙烯共聚 物、苯乙烯-丙烯腈共聚物等的熱塑性樹脂；環氧樹脂、 乙烯基醚樹脂、具有2個以上之（甲基）丙烯酸基之（甲 基）丙烯酸酯、氧雜環丁烷樹脂、乙烯基酯樹脂等可以熱 或活性能量線硬化的硬化性樹脂。其中可以熱或活性能量 線硬化的硬化性樹脂可容易與玻璃纖維或玻璃纖維布複合 化’而且熱安定’因此較佳，而環氧樹脂、具有2個以上 的（甲基）丙烯酸基之（甲基）丙烯酸酯更佳。 樹脂材料中所含有之異形粒子的比例係對於樹脂成分 100質量份時，較佳爲1〜1000質量份，更佳爲1〜500質 -25- 200904860 (22) 量份，特佳爲1〜100質量份。異形粒子的含有tt 質量份時，光擴散性有難以充分提高的傾向。若 質量份時，光透過性有顯著降低的傾向。 本實施形態之第一光擴散成型品係例如將樹 異形粒子供給擠壓機，將壓出物作母料化後，將 給擠壓機，射出於模腔內，進行成形加工等的 得。 本實施形態之第一光擴散成型品係具有優異 性及光擴散性。因此，本實施形態之第一光擴散 發揮這種特性，適合作爲導光板、光擴散板、 等。 (第二光擴散成型品） 構成第二光擴散成型品的基材層較佳爲由透 透明、有色透明、或半透明）之樹脂所構成的層 基材層之樹脂的具體例，例如有與前述構成第一 型品之樹脂材料中所含有的樹脂成分相同者。 形成於基材層之至少一面上的光擴散層係由 粒子組成物所構成的層。異形粒子組成物中所含 粒子係藉由相同異形粒子組成物中所含有的黏結 在基材層上形成一體化。一部分的異形粒子可成 劑成分之表面以一部分突出的狀態。又，異形粒 部分可藉由黏結劑成分全面地被覆，或僅一部分 可爲異形粒子之全部完全埋沒於黏結劑成分中的 L例未達1 超過1000 脂成分與 此母料供 方法來製 的光透過 成型品係 光擴散膜 明（無色 。構成此 光擴散成 前述異形 有的異形 劑成分， ，爲由黏結 :子之突出 •被覆。也 狀態。 -26- 200904860 (23) 本實施形態之第二光擴散成型品，例如將（A )異形 粒子及（B)黏結劑成分分散或溶解於（C)可分散或溶解 這些成分的有機溶劑中’形成漿體狀，藉由各種塗佈機塗 佈及乾燥來製造。（c)有機溶劑的具體例，例如有水、 甲苯、環己烷、甲基異丁酮（MIBK )、甲基乙基酮 (MEK ) 、N-甲基-2-吡咯烷酮（NMP)等。 (C )有機溶劑的含有比例係對於（a )異形粒子+ (B)黏結劑成分=100質量份時，較佳爲1〇〜2000質量 份，更佳爲20〜1 000質量份。 基材層的厚度無特別限定，通常爲0.03〜0.3mm，較 佳爲0.05〜0.2 mm左右。又，光擴散層的厚度也無特別限 定，通常爲0.01〜0.1mm’較佳爲〇.〇2〜〇.〇8mm左右。 本實施形態之第二光擴散成型品係具有優異的光透過 性及光擴散性者。因此’本實施形態之第二光擴散成型品 係發揮這種特性’適合作爲光擴散板、光擴散膜等。 【實施方式】 [實施例] 以下’依據實施例具體說明本發明，但是本發明不受 此等實施例所限定。實施例、比較例中之「份」及 「％」’只要沒有特別聲明時，表示質量基準。又，各種 物性値之測定方法及諸特性的評價方法如下所示。 [數平均粒徑]:使用Beckmann-Coulter公司製之雷射 粒徑解析系統（商品名稱「L S 1 3 3 2 0」來測定。 -27- 200904860 (24) [長徑之數平均値（L)及短徑之數平均値（D)]:使 用SEM觀察來測定。 [全光線透過率]:使用Suga試驗機公司製之霧度計， 依照JI S K 7 1 0 5 ’以無試料之狀態（空氣）作爲1 〇 〇 %來測 定。 [霧度]:使用Suga試驗機公司製的霧度計，依照 JIS K71 05來測定。 1 .聚合物粒子的合成 (實施例1 ) 將3,5,5-三甲基己醯基過氧化物（商品名「？61^1 3 5 5」’日本油脂公司製，水溶解度：〇·〇〗％) 2質量份、 月桂基硫酸鈉〇· 1質量份及水20質量份經攪拌乳化後’ 再藉由超音波均質機微粒子化，得到水性分散體。在製得 之水性分散體中添加數平均粒徑Ι.Ομιη之單分散聚苯乙烯 粒子15質量份，攪拌16小時。接著’添加苯乙烯（ST) 70質量份、二乙烯基苯（DVB) 20質量份及甲基丙烯酸 縮水甘油酯（G M A ) 1 0質量份，以4 0 °c徐徐攪拌3小 時，使單分散聚苯乙烯粒子吸收單體成分（ST、DVB、及 GM A )。然後，升溫至7 5 °C，進行3小時的聚合反應’得 到含有由第一聚合物所構成之（a )粒子的乳朦。（a )粒 子之數平均粒徑爲1 .8μπι，幾乎沒有發生凝固物。 混合與前述水性分散體相同的水性分散體22 · 1質量 份及含有上述（a )粒子之乳膠20質量份（但是爲固形份 -28- 200904860 (25) 狀態）’攪拌I 6小時。接著，添加Μ M A 9 0質量份及三 羥甲基丙烷三甲基丙烯酸酯（TMPMA ) 1 0質量份，以 4〇°C徐徐攪拌3小時，使（a)粒子吸收單體成分（MMa 及TMPMA)。然後，升溫至75°C，進行3小時聚合反 應’形成由第二聚合物所構成之（b )粒子，得到含有由 (a )粒子與（b )粒子所構成之聚合物粒子（聚合物 (A))的乳膠。聚合物粒子的形狀係如圖1 ( a )所示之 形狀（葫蘆形狀、西洋梨形狀或雪人形狀），（b )粒子 的數平均粒徑係Ιμιη，聚合物粒子的數平均粒徑爲 3.5μπι， （ L ) / ( D )比係 1 .6，及 La ( μιη ) /Lb ( μπι ) = 1.9/2.6，幾乎未發生凝固物。製得之聚合物粒子之掃描 型電子顯微鏡（SEM)相片如圖4所示。 (實施例2、3,比較例1〜6 ) 除了第一聚合物與第二聚合物之調配處方如表1所示 外（但是比較例1及2未形成第二聚合物），與前述實施 例1同樣得到分別含有聚合物粒子（聚合物（B )〜 (I ))的乳膠。各種物性値如表1所示。但是聚合物 (Η)(比較例5)係聚合物凝集的凝集物。 -29- 200904860 (26) 【1® 比較例6 聚合物(I) (Ν § 1 1 1 ο 1 I 1 舒 比較例5 聚合物(Η) 1 1 ο 1 1 1 I 1 凝集 比較例4 聚合物(G) (Ν 〇 〇 1 1 ο 0.58 0.82 卜 ci 0.58/0.82 圖 1(A) 比較例3 聚合物(F) (Ν 〇 〇 1 1 § ο 0.39 0.43 0.39/0.43 圖 1(A) 比較例2 聚合物(Ε) 1 1 ] 冢 〇 1 1 1 1 1 m *—Η 1 舒 比較例1 聚合物(D) (Ν 〇 〇 1 1 1 1 1 1 1 (N 1 實施例3 聚合物(C) κη 〇 〇 1 1 ο 1.62 1.91 1.62/1.92 圖 1(A) 實施例2 聚合物(Β) (Ν 〇 〇 1 1 ο 1.11 1.56 1.11/1.56 圖 1(A) 實施例1 聚合物(Α) 〇 〇 1 1 ο Ο) (N 1.9/2.6 圖 1(A) 單分散聚苯 乙烯粒子 DVB GMA MMA TMPMA 第一聚合物 1 MMA ΤΜΡΜΑ ⑷粒子 (b)粒子 粒子整體 (L)/(D)比 B =S- /—N B =L 粒子形狀 ⑷粒子 (第一聚合物） (a)粒子(第一聚 合物)+(b)粒子 (第二聚合物） 數平均粒徑 (β^η) 黯圇艘枳§ ^^ -30- 200904860 (27) 2 _聚合物組成物之調製及光擴散成型品之製作： (實施例4) 使用噴霧乾燥器（型號「L-8型」，大川原化工機公 司製）使含有聚合物（A )之乳膠乾燥，得到粉末狀的聚 合物（A)。對於混合聚甲基丙烯酸甲酯（聚MMA )(商 品名「Parapet HR_L」，KURARAY公司製，熔融指數： 2 g/10分鐘）50質量份及甲基異丁基酮（MIBK) 200質量 份所得之混合液，添加上述粉末狀聚合物（A ) 5 0質量份 經分散，而得到聚合物組成物。 接著，將製得之聚合物組成物均勻層狀塗佈於聚對酞 酸乙二酯（PET )製的基材（全光線透過率·· 87.3%，霧 度：2.8%，厚度：200μπι)上後，以60°C乾燥3小時，得 到具有厚度25μηι之光擴散層的光擴散膜（實施例4)。 製得之光擴散膜的全光線透過率係100%，霧度爲92.4%， 具有非常良好平衡者。 (實施例5〜7、比較例7〜1 2 ) 除了以表2所示之調配合處方外，與前述實施例4的 情形相同’得到聚合物組成物。又，使用製得之各聚合物 組成物’與前述實施例4相同，得到光擴散膜（實施例5 〜7、比較例7〜12)。製得之光擴散膜之光擴散層的厚 度、全光線透過率及霧度如表2所示。 -31 - 200904860 (28) 【rNls 霧度 (%) 92.4 92.6 91.1 93.2 92.2 82.2 88.5 69.3 71.0 1 86.0 L_______________ 00 (N 00 (N ! 全光線透過率 (%) 〇 〇 ψ Η 99.5 〇 — Η 89.2 99.7 99.8 91.4 94.3 95.1 87.3 1_________________ 1- 88.2 光擴散層厚度 (#m) (N 00 m P； ΓΟ 1 (N (N 調配處方(份） 粒子 § 沄 1 1 (聚合物） g g g X Q g 〇 1 1 溶劑 (MIBK) 〇 200 200 200 200 200 200 200 200 200 1 1 聚MMA (黏結劑成分） 1 1 實施例4 實施例5 實施例6 實施例7 比較例7 比較例8 比較例9 比較例10 比較例Π 比較例12 基材*1 空白樣品*2 ?7/(N(N:Mtt)ilv2s^+?7/00(N:^ft)lHd(N*(sy.oo(N:^lil!)13d:r -32- 200904860 (29) (考察） 如圖4所示得知實施例1製得之聚合物粒子（異形粒 子）係由粒徑不同之2種粒子所構成，其整體形狀爲其中 之一粒子以突起狀與另一粒子結合，所謂的雪人形狀（或 葫蘆形狀、西洋梨形狀）。如表2所示，使用實施例1〜3 之聚合物粒子製作之實施例4〜7的光擴散膜係比使用比 較例1〜4及比較例6之聚合物粒子製作之比較例7〜1 2 的光擴散膜，全光線透過率及霧度之平衡非常優異。 比較例9之光擴散膜係單純混合粒子形狀爲球之聚合 物（A)與聚合物（B )所得混合物所製作的。如上述，不 使用異形粒子，僅混合不同之粒子很明顯難以提高霧度 値。即使粒子形狀爲異形，使用如聚合物（F)及聚合物 (G )，其數平均粒子徑未達〇 · 8 μιη者所製作之比較例 1 0、1 1的光擴散膜，其全光線透過率與霧度之値均較低。 [產業上利用性] 本發明之光擴散成型品適合作爲導光板、光擴散板、 光擴散膜。 【圖式簡單說明】 [圖1 ( A )]表示本發明之異形粒子之一實施形態的模 式圖。 [圖1 ( B )]表示粒子成長，形狀改變之中狀態的模式 圖。 -33- 200904860 (30) [圖1 (c)]表示粒子成長，形狀改變之中途狀態的模 式圖。 [圖2]說明異形粒子之長徑與短徑的模式圖。 [圖3 (A)](b)表示粒子成長様子之初期階段的模 式圖。 [圖3 ( B ) ] ( b )表示粒子成長様子之中間階段的模 式圖。 [圖3 ( C) ]( b)表示粒子成長樣子之最終階段的模 式圖。 [圖4]實施例1之聚合物粒子之掃描型電子顯微鏡 (S E Μ )相片。 【主要元件符號說明】 1 ( a ):粒子 2 ( b ):粒子 * 5 :異形粒子 D :短徑 L :長徑 -34-。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 Light diffusion molded product. [Prior Art] Currently, display devices for televisions, personal computers, and the like use liquid crystal display devices. The liquid crystal display device includes a light source, a light guide plate disposed near the light source and irradiated, and a light diffusing plate, a prism lens, and a liquid crystal display panel which are disposed in front of the light guide plate in this order. The light diffusing plate disposed in front of the light guide plate is used to spread the light passing through the light guide plate more uniformly. Attempts have been made to improve the brightness of liquid crystal display devices by improving the characteristics of the light diffusing plate. In the related art, a light-diffusing sheet using light-diffusing resin particles having a mean particle diameter and a particle size distribution with a coefficient of variation (CV値) within a predetermined range is disclosed (for example, see Patent Document 1). However, even when a light diffusing plate using the light diffusing resin particles described in Patent Document 1 is used, the brightness of the liquid crystal display device is not always sufficiently improved, and further improvement is desired. Specifically, it is required to develop a light diffusing plate having excellent light transmittance and light diffusibility and higher brightness. In order to satisfy this requirement, a light-diffusing sheet using synthetic resin particles having an average particle diameter and an average particle diameter distribution within a specified range is disclosed (for example, see Patent Document 2). However, the 200904860 (2) light-diffusing sheet using the synthetic resin particles described in Patent Document 2 has room for improvement in light transmittance and light diffusibility, and it is desired to develop a light-diffusing molded article having higher characteristics and to manufacture it. The material of the light diffusion molded article. [Patent Document 1] Japanese Laid-Open Patent Publication No. Hei. No. Hei. No. 2004-226604. [Disclosure of the Invention] The present invention is based on such prior art. The problem is that the person who has completed the problem provides a profiled particle that can provide a light-diffusing molded article excellent in light transmittance and light diffusibility, a shaped particle composition and a method for producing the same, and excellent light transmittance and light diffusibility. Light diffusion molded article. In order to achieve the above-mentioned problems, the inventors of the present invention have made it possible to achieve the above problems by using an irregular particle having a number average particle diameter of two or more kinds of particles within a predetermined number of enthalpy. That is, according to the present invention, the irregular particles, the irregular particle composition, the method for producing the same, and the light-diffusing molded article shown below can be provided. [1] A heteromorphic particle characterized by comprising: 60 to 98% by mass of (al) aromatic vinyl monomer unit; (a2) 2 to 4% by mass of a monomer unit containing a polar functional group; A3) Other monomer units 〇 38% by mass (but (al) + (a2) + (a3) = 1 〇〇 mass%) of the first polymer consisting of (a) particles and containing -6- 200904860 (3) (b) aromatic vinyl monomer unit 〇 25% by mass, (b2) monomer unit containing polar functional group 75 to 100% by mass, and (b3) other monomer unit 0 to 25 mass % (but (bl) + (b2) + (b3) = 100% by mass) (b) particle's overall shape formed by a second polymer which is arranged in a protruding shape on at least a part of the surface of the particle (a) The snowman shape formed by the at least one of the (a) particles and the (b) particles respectively contacting or overlapping each other, and having a number average particle diameter of 0. 8~ΙΟμιη. [2] The heteromorphic particle of the above item [1], wherein a ratio of the number average particle diameter (La) of the (a) particle to the number average particle diameter (Lb) of the (b) particle is (La) / (Lb) ) =0. 05 ~ 20. 0. [3] The heteromorphic particle according to the above item [2], wherein the (a) particle is a seed polymer particle, and the (bl) aromatic vinyl monomer unit is used, and (b2) contains a polar ruthenium group. At least one of the monomer unit and (b3) each of the other monomer units is formed by seed polymerization. [4] A heteromorphic particle composition comprising (A) the shaped particles of any one of the above π] to [3] and the (Β) binder component. [5] A method for producing a heterogeneous particle composition, comprising: removing a solvent from a latex containing the shaped particles according to any one of the above [1] to [3], and obtaining the shaped particles in a dry state; a step of mixing the prepared shaped particles with a binder. [6] A light-diffusing molded article is characterized in that it is composed of a resin material containing a resin component and the above-mentioned irregular particles of any one of [Π~[3] (referred to as "first" under the name of 200904860 (4) Light diffusion molded product"). [7] The light-diffusing molded article of the above [6], which is a light guide plate, a light diffusing plate or a light diffusing film. [8] A light-diffusing molded article comprising: a base material layer; and a light-diffusing layer formed of the irregular-shaped particle composition according to the above item [4] formed on at least one surface of the base material layer (hereinafter) It is called "11th light diffusion: molded product"). [9] The light-diffusing molded article according to [8] above, which is a light guide plate or a light diffusion film. The shaped particles of the present invention have an effect of providing a light-diffusing molded article excellent in light transmittance and light diffusibility. The shaped particle composition of the present invention has an effect of providing a light-diffusing molded article excellent in light transmittance and light diffusibility. According to the method for producing irregular particles of the present invention, a heterogeneous particle composition capable of providing a light-diffusing molded article excellent in light transmittance and light diffusibility can be produced. The first and second light-diffusing molded articles of the present invention have an effect of excellent light transmittance and light diffusibility. BEST MODE FOR CARRYING OUT THE INVENTION The best mode for carrying out the invention will be described below, but the present invention is not limited to the embodiment of the present invention, and the general knowledge of those skilled in the art is not included in the scope of the present invention. It is also within the scope of the present invention to appropriately change, improve, and the like in the following embodiments. In the present invention, the light diffusing molded article of the present invention (the present embodiment) is any one of the first light diffusing molded article and the second light diffusing molded article. 1 . Shaped particle: One embodiment of the shaped particle of the present invention comprises: (a) a particle composed of a first polymer and a second polymer in which at least a part of a surface of the particle (a) is arranged in a protrusion shape (b) The particle has an overall shape of a snowman shape formed by the at least one of the (a) particle and the (b) particle being at least in contact with each other or overlapping, and the number average particle diameter is 0. 8~10 μιη. The details are as follows. ((a) Particles) The (a) particles constituting the irregular particles of the present embodiment are composed of the first polymer. The first polymer is preferably a seed polymer particle which can absorb oil-soluble polymerization-initiating cerium having an organic compound having a water solubility of 1 (Γ 2% by mass or less). Specifically, for example, a benzene-ethyl polymer, benzene A smectic polymer such as a styrene-based copolymer or an acrylic vinegar-based polymer, etc. The first polymer constituting the (a) particle contains an (al) aromatic vinyl group as a constituent unit. a monomer unit (hereinafter referred to as "constituting unit (al)") and (a2) a monomer unit containing a polar functional group (hereinafter referred to as "constituting unit (a2)"). If necessary, it may contain a constituent unit. (a3) Other monomer units (hereinafter referred to as "structural unit (a3)"). -9- 200904860 (6) ((al) aromatic vinyl monomer unit) constituent unit (al) using aromatic B The dilute base monomer 'for example, styrene, α-methylstyrene, vinyl toluene, p-methylstyrene, 2-methylstyrene, 3-methylstyrene, 4-methylstyrene, 4 -ethylstyrene, 4-tert-butylstyrene, 3,4-dimethylstyrene, 4-methoxyl Ethylene, 4-ethoxystyrene, 2-chlorostyrene, 3-chlorostyrene, 4-chlorostyrene, 2,4-dichlorostyrene, 2,6-dichlorostyrene, 4-chloro- 3-methylstyrene, divinylbenzene, divinylnaphthalene, 2-ethendylquinidine, 4-vinylpyridine, etc. Among them, styrene, divinylbenzene, and α-methylbenzene are preferred. Ethylene. These aromatic vinyl monomers may be used alone or in combination of two or more. The ratio of the constituent units (al) contained in the first polymer is as a constituent unit (al), a constituent unit (a2), and When the total amount of the constituent units (a3) is 100% by mass, it is preferably 60 to 98% by mass, preferably 65 to 95% by mass, more preferably 7 to 90% by mass. The constituent unit contained in the first polymer (a) When the ratio of 1) is less than 60% by mass, the light diffusibility tends to be deteriorated. When the ratio is more than 98% by mass, the heterogeneous particles tend to be difficult to obtain. ((a2) Monomer unit containing a polar functional group a monomer having a polar functional group in a monofunctional molecule containing a polar functional group used in the constituent unit (a2). The polar functional group has, for example, a carboxyl group. Specific examples of the polar functional group-containing monomer are a cyano group, a hydroxy group, a glycidyl group, an ester group, etc., and the monomers represented by the following (1) to (5) are exemplified below as -10-200904860 (7). The single system may be used singly or in combination of two or more. (1) Carboxyl group-containing monomer: (meth)acrylic acid, crotonic acid, cinnamic acid, maleic acid, maleic anhydride, fumaric acid, and itoic Acid, Iconic anhydride, monomethyl maleate, monoethyl maleate, monomethyl meconate, monoethyl meconate, mono-2-(methyl) propylene sulfoxide A carboxyl group-containing unsaturated monomer such as an ethyl ester or an acid anhydride thereof. Among them, (meth)acrylic acid is preferred. (2) Cyano group-containing monomers: vinyl cyanide monomers such as (meth)acrylonitrile, crotononitrile, and cinnamic acid nitrile; 2-cyanoethyl (meth)acrylate and (meth)acrylic acid 2 -Cyanopropyl ester, 3-cyanopropyl (meth)acrylate. Among them, (meth)acrylonitrile is preferred. (3) Hydroxyl-containing monomers: methylol (meth)acrylate, 2-hydroxyethyl (meth)acrylate, 6-hydroxyhexyl (meth)acrylate, 4-hydroxycyclohexane (meth)acrylate Mono(meth)acrylic acid hydroxy(cyclo)alkyl esters such as esters, neopentyl glycol mono(meth)acrylates, etc.; 3-chloro-2-hydroxypropyl (meth)acrylate, (meth)acrylic acid 3 A mono(meth)acrylic acid substituted with a hydroxy(cyclo)alkyl ester such as an amino-2-hydroxypropyl ester. Among them, hydroxymethyl (meth)acrylate is preferred. (4) Glycidyl group-containing monomer: allyl glycidyl ether, glycidyl (meth)acrylate, methyl glycidyl methacrylate, cyclohexyl (meth)acrylate. Among them, glycidyl (meth)acrylate is preferred. (5) Ester group-containing monomer: methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, n-hexyl (meth) acrylate '(meth) acrylate 2- Ethylhexyl ester '(meth)acrylic acid-11 - 200904860 (8) (cyclo)alkyl (meth)acrylates such as cyclohexyl ester; 2-methoxyethyl (meth)acrylate, (methyl) a polyvalent (meth) acrylate such as an alkoxy (cyclo)alkyl (meth) acrylate such as p-methoxycyclohexyl acrylate; or a trimethylolpropane tri(meth) acrylate; Vinyl esters such as vinyl acetate, vinyl propionate, versatic acid vinyl ester, and the like. Among them, preferred is methyl (meth)acrylate. The ratio of the constituent unit (a2) contained in the first polymer is 2 to 40% by mass in the case where the total of the constituent unit (al), the constituent unit (a2), and the following constituent unit (a3) is 100% by mass. It is preferably 4 to 35 mass%, more preferably 8 to 30 mass%. When the proportion of the constituent unit (a3) contained in the first polymer is less than 2% by mass, it is difficult to obtain the shaped particles. On the other hand, when it exceeds 40% by mass, the light transmittance tends to be deteriorated. (Other monomer unit) The first polymer may optionally contain a monomer unit (also referred to as a constituent unit (a3)) composed of another monomer copolymerizable with the above various monomers. Other monomers constituting the constituent unit (a3) are as follows, for example. N-methylolated unsaturated carboxamides such as N-hydroxymethyl (meth) acrylamide, N, N-dimethylol (meth) acrylamide, etc.: 2-dimethylamino B Aminoalkyl-containing acrylamides such as acrylamide; (meth) acrylamide, N-methoxymethyl (meth) acrylamide, N, N-ethylene bis (methyl) Amidoxime or quinone imine of an unsaturated carboxylic acid such as acrylamide, maleic amine or maleimide; N-methyl acrylamide 'N,N-dimethyl propylene fluorene-12 - 200904860 (9) N-monoalkyl (meth) acrylamide such as amine, N,N-dialkyl acrylamide; amine-containing alkane such as 2-dimethylaminoethyl (meth)acrylate (A) amino group-containing alkoxyalkyl group-containing (meth) acrylates such as (meth) acrylates; (meth) acrylate 2 (dimethylamino ethoxy) ethyl ester; a vinyl compound such as vinylidene chloride or a fatty acid vinyl ester; 1,3-butadiene, 2-methyl-1,3-butadiene, 2-chloro-1,3-butadiene, A conjugated diene compound such as 2,3-dimethyl-1,3-butadiene. The ratio of the constituent unit (a3) contained in the first polymer is 0 to 38% by mass, preferably 0 to 38% by mass, based on the total of the constituent unit (al), the constituent unit (a2), and the constituent unit (a3). It is 0 to 30% by mass, more preferably 〇~20% by mass. ((b) Particles) The (b) particles constituting the irregular particles of the present embodiment are composed of the second polymer. This second polymer contains (b2) a monomer unit containing a polar functional group as a constituent unit (hereinafter also referred to as "constituting unit (b2)"). The second polymer contains (bl) an aromatic vinyl monomer unit (hereinafter also referred to as "constitutive unit (bl)") and, if necessary, (b3) another monomer unit (hereinafter also referred to as "constituting unit" (b 3 )") as a constituent unit. ((bl) Aromatic Vinyl Monomer Unit) The aromatic vinyl monomer constituting the constituent unit (b 1 ), for example, and the aromatic vinyl monomer phase used in the constituent unit (al)-13 - 200904860 (10) The same. Among them, preferred are styrene, divinylbenzene, and α-methylstyrene. These aromatic vinyl-based single systems may be used alone or in combination of two or more. The ratio of the constituent unit (b1) contained in the second polymer is 0 to 25% by mass, preferably 1%, in the case where the total of the constituent unit (b1), the constituent unit (b2), and the constituent unit is 100% by mass. ~2〇% by mass 'better than 2 0~1 5 mass%. The proportion of the constituent ruthenium (bl) contained in the second polymer exceeds 25 mass. /. At the time, the light transmittance has a tendency to deteriorate. ((b2) a monomer unit containing a polar functional group) A monomer having a polar functional group in a monofunctional molecule containing a polar functional group used in the constituent unit (b 2 ). The polar functional group has, for example, a residue, a cyano group, a trans group, a glycidyl 'ester group, and the like. Specific examples of the monomer having a polar functional group are, for example, the same as those of the polar functional group-containing monomer used for the constituent structural unit (a2). Among them, a monomer having an ester group is preferred, and a (meth)acrylic acid (cyclo)alkyl ester such as methyl (meth)acrylate, diethylene glycol di(meth)acrylate, or trimethylol group is preferred. A polyvalent (meth) acrylate such as propane tri(meth)acrylate. These polar group-containing monomers may be used alone or in combination of two or more. The ratio of the constituent unit (b 2 ) contained in the second polymer is 100 Å by mass of the constituent unit (bl), the constituent unit (b2), and the following constituent unit (b3). When it is 〇, it contains 75 to 100% by mass, preferably 75 to 95% by mass, and more preferably 80 to 90% by mass. When the ratio of the structure (14) to the unit (b3) contained in the second polymer is less than 75% by mass, the light transmittance tends to be deteriorated. (Other monomer unit) The second polymer may optionally contain a monomer unit (also referred to as a constituent unit (b3)) composed of another monomer copolymerizable with the above various monomers. The other monomer constituting the constituent unit (b3) may be, for example, the same as the other monomer used for the constituent constituent unit (a3). The ratio of the constituent unit (b3) contained in the second polymer is 0 to 25% by mass in the case where the total of the constituent unit (b1), the constituent unit (b2), and the constituent unit (b3) is 1% by mass. It is preferably 0 to 20% by mass, more preferably 0 to 15% by mass. (Amorphous Particles) The shaped particles of the present embodiment have (a) particles and (b) particles. Further, (b) the particles are arranged in a protruding shape on at least a part of the surface of the (a) particles. The term "heteromorphism" as used in the present specification means a section (a) particle and (b) of a profiled particle according to an embodiment of the present invention, which is cut by a center of the (a) particle and a center of the particle (b). The distance between the centers of the particles is a shape of (a) the radius of the particles and (b) the sum of the radii of the particles. In other words, the shape of the shaped particles of the present embodiment is such that (a) the shape of the particles is locally present on the surface of the particles (b) or the shape of (a) the particles are locally present on the surface of the particles (a). (a) Both the particles and (b) particles are substantially integrated in a single region, while the asymmetry -15-200904860 (12) the center point of the particle as a whole is asymmetric. The heteromorphic particle system of the present embodiment is different from the conventional core-shell particles in which the core portion is not exposed on the surface of the particles, and both the (a) particles and the (b) particles are exposed on the surface. The overall shape of the irregular shaped particles of the present embodiment is a snowman shape (or a pear shape or a gourd shape) formed by at least one of (a) particles and (b) each of the particles being in contact with each other or overlapping, preferably at the center or the center thereof. There is a neck shape near the part. The specific shape of the "alien" having such a snowman shape (or a pear shape or a gourd shape) is, for example, the shape shown in Fig. 1 (A). In the shaped particles of this embodiment, the composition of the first polymer and the composition of the second polymer may be the same or different, but it is also preferred that at least one of the monomer units contained in the first polymer and the second polymer are The monomer units contained are different. In other words, at least one of the monomer units constituting the shaped particles at this time is contained only in the polymer of any of the first polymer and the second polymer. Thus, for example, the (a) particles can be asymmetrically separated from the (b) particles. The ratio of the number average 値(L) of the major axis of the shaped particle of the present embodiment to the number average 値(D) of the short diameter is (L) / (D) =1. 0~2. 0, preferably 1. 1~1. 9, better is 1. 2~1. 8. (L) / (D) is more than 2. When 0, the dispersibility of the binder component is lowered, and it is difficult to obtain a uniform light diffusing function. Here, the "long diameter" and "short diameter" when the irregular particles are spherical having a spherical protrusion as shown in Fig. 1(A) will be described. As shown in Fig. 2, the 'long diameter (L) system indicates the distance from the end of (a) particle 1 to the end of (b) particle 2. Further, the short diameter (D) indicates the diameter of the larger particles ((a) particle 1 in Fig. 2) in the particles. -16- (13) (13) 200904860 The ratio of the number average particle diameter (La ) of the particles of the shaped particles (a) of the present embodiment to the number average particle diameter (Lb ) of the particles (b) is (La ) / ( Lb) =0. 05~20. 0, preferably 0. 2 to 18, especially good for 0. 4 to 15. However, since the irregular particles of the present embodiment differ in the particle diameters of the (a) particles and the (b) particles, there is no case where (La ) / ( Lb ) =1. (La ) / (Lb ) is less than 0. At 05 o'clock, the balance between light transmittance and light diffusibility tends to deteriorate significantly. When the enthalpy of (La) / (Lb) exceeds 20_0, the balance of light transmittance and light diffusibility also tends to be significantly deteriorated. When the shape of the particles is not a true spherical shape but a so-called flat shape or the like, the average 値 of the long diameter and the short diameter is referred to as "average particle diameter". The refractive index (Ra) of the (a) particles of the embodiment of the present embodiment is preferably (Ra) / (Rb) = 0. 7 ~ 1. 4, more preferably 0. 8 ~ 1. 3, especially good for 0. 85 ~ 1. 25. (Ra)/ (Rb) has not reached 0. At 7 o'clock, there is a tendency to obtain irregular particles. And if (Ra) / ( Rb ) is more than 1. At 4 o'clock, it is also difficult to obtain the tendency of the shaped particles. The refractive index is measured by the following method. The measurement of the refractive index: (1) The particles to be measured were dried at 80 ° C for 24 hours, and then pulverized, and filtered through a metal mesh of 60 mesh to prepare a test sample (dried primary particles). (2) The prepared primary particles were mixed with a refractive index standard solution (manufactured by Cargil U Co., Ltd.) having an appropriate refractive index to prepare a primary particle dispersion. (3) The primary particle dispersion prepared by microscopic observation was used to confirm whether or not the contour portion of the primary particle was discernible, and the refractive index of the refractive index standard solution when the film was not recognized was used as the "refractive index" of the particle. -17- (14) (14)200904860 When the first polymer and/or the second polymer of the present embodiment have one or more reactive functional groups, there is a tendency to easily maintain good polymerization stability. Preferably. Examples of the "reactive functional group" include a hydroxy group, a decylamino group, an amino group, a carboxyl group, a sulfonic acid group, a sulfate group, a glycidyl group, and a hydroxyl group. The polymer having a reactive functional group is copolymerized with an ester group, a mercapto group, an amine group, a residue, a glycidyl group, and a hydroxyl group, for example, a monomer having such a reactive functional group, or has such a reactive functional group. The compound is grafted. Further, the polymer having an acid-expanding group is obtained by, for example, polymerizing a monomer in the presence of a reactive surfactant having an acid-expanding group. Further, the polymer having a sulfate group is obtained by, for example, polymerizing a monomer using an initiator such as potassium persulfate. The amount of the reactive functional group contained in the first polymer and/or the second polymer is converted into a compound used in the introduction of the reactive functional group, and each polymer is preferably ruthenium. 5 to 5 0% by mass, more preferably 2 to 30% by mass. (Method for Producing Shaped Particles) The shaped particles of the present embodiment can be produced, for example, by the method described below. First, the (a) particle composed of the first polymer can be obtained by a general emulsion polymerization method using an aqueous medium. This "aqueous medium" means a medium containing water as a main component. Specifically, the content of water in the aqueous medium is preferably 40% by mass or more, and more preferably 50% by mass or more. Other media which can be used with hydrazine are, for example, compounds such as vinegars, ketones, anthraquinones, alcohols and the like. The conditions of the emulsion polymerization can be in accordance with a conventional method. For example, when the total amount of the single 18-200904860 (15) body is 100 parts, usually 100 to 500 parts of water is used, and the polymerization temperature is -10 to 100 ° C (preferably -5 to 100). °c, more preferably 〇~ 90 ° C), polymerization time is 0. The emulsion polymerization is carried out under conditions of 1 to 30 hours (preferably 2 to 25 hours). The method of emulsion polymerization may adopt a batch mode in which the monomers are once-inputted, a batchwise or continuous supply of the monomers, a batchwise or continuous addition of the monomer pre-latex, or a combination of these modes in stages. Ways, etc. Further, if necessary, one or two or more kinds of molecular weight modifiers, chelating agents, inorganic electrolytes and the like used in the emulsion polymerization may be used. When an initiator is used in the emulsion polymerization, a persulfate such as potassium persulfate or ammonium persulfate can be used as the initiator; benzhydryl peroxide, lauryl peroxide, and tert-butylperoxy-2- An organic peroxide such as ethyl hexanoate; an azobisisobutyronitrile, dimethyl-2,2'-azobisisobutyrate, 2-aminoformyl azaisobutyronitrile or the like A nitrogen compound; a redox system in which a radical emulsifier containing a radical emulsified compound having a peroxidation group, a reducing agent such as sodium hydrogen sulfite or ferrous sulfate is combined. Further, when an emulsifier is used, the emulsifier may be one or more selected from the group consisting of conventional anionic emulsifiers, nonionic emulsifiers and amphoteric emulsifiers. A reactive emulsifier having an unsaturated double bond in the molecule or the like can also be used. The molecular weight modifier used in the emulsion polymerization is not particularly limited. Specific examples of the molecular weight regulator, such as n-hexyl mercaptan, n-octyl mercaptan, n-decyl mercaptan, tridecyl mercaptan, n-hexadecyl mercaptan, n-tetradecyl mercaptan, tertiary ten Mercaptans such as tetrakisyl mercaptan and thiol acid; dimethyl acetyl xanthine disulfide, diethyl acetyl xanthine disulfide, diisopropyl acetyl xanthine di- 19- (16 (16)200904860 Sodium sulphate disulfide such as sulfide; autumn of tetramethyl thiuram disulfide, tetraethyl thiuram disulfide, tetrabutyl thiuram disulfide Lamb disulfide; halogenated hydrocarbon such as chloroform, carbon tetrachloride, carbon tetrabromide or vinyl bromide; hydrocarbons such as pentaphenylethane and α-methylstyrene dimer; acrolein, Methacrolein, allyl alcohol, 2-ethylhexyl thiol ester, onion oleyl 'α-terpinene, γ-terpinene, dipentene, fluorene-diphenylethylene, and the like. These molecular weight modifiers may be used alone or in combination of two or more. Among these, mercaptans, xanthophytide disulfides, thiuram disulfides, 1,1-diphenylethylene, and α-methylstyrene dimers are more suitable. The polymerization conversion ratio of the monomer at the end of the emulsion polymerization is preferably 8 〇 by mass or more, more preferably 90% by mass or more, and particularly preferably 95% by weight or more. When the polymerization rate of the first polymer is less than 80% by mass, when the monomer for the second polymer is introduced, the (a) particles and the (b) particles formed are difficult to be clearly separated. The (a) particles composed of the first polymer obtained are usually spherical particles. (a) The number average particle diameter of the particles is preferably os~1〇 μηι, more preferably ι·〇~10μη1. (a) When the number average particle diameter of the particles is outside this range, it may be difficult to carry out emulsion polymerization. The monomer for the second polymer is polymerized in the presence of the (a) particles obtained. More specifically, in the state in which the (a) particles are used as the seed polymer particles, the present embodiment can be obtained by seed-polymerizing a monomer for the second polymer to form (b) particles. Alien particles. For example, the second polymer monomer or its pre-latex may be dropped in one, batch or continuous in an aqueous medium in which the (a) particles are dispersed. In the case of the second polymer monomer, the amount of the particles is preferably from 1 to 100% by mass, more preferably from 2 to 80% by mass, based on 100 parts by mass of the second polymer monomer. When an initiator or an emulsifier is used for the polymerization, the same as in the case of producing (a) particles can be used. Further, the conditions such as the polymerization time may be the same as those in the case of producing (a) particles. In the aqueous medium in which the (a) particles are dispersed, when the monomer for the second polymer is charged, as shown in Fig. 3(A), most of the monomer for the second polymer to be charged is usually once (a) By occlusion, this (a) particle or its surface begins to polymerize. The second polymer is separated from the first polymer by a single system as the polymerization proceeds to reduce compatibility with the first polymer. Therefore, at the initial stage of polymerization, polymerization can be carried out at a plurality of (a) particles, but when the monomer units constituting each polymer satisfy the relationship described so far, the second polymer is aggregated with each other among the (a) particles. The tendency to form a single (b) particle (Fig. 3(B)). (b) When the particles grow to a certain extent, the subsequent polymerization is mainly carried out by the particles (b) (Fig. 3(C)). Thus, the (a) particles and the (b) particles are asymmetrical particles of the present embodiment which are asymmetrically separated. The number average particle diameter of the shaped particles of the present embodiment obtained as described above is 0. 8~ΙΟμηι, preferably 1. 0~ΙΟμηι, more preferably 1. 2~ΙΟμιη. When the number average particle diameter is more than 1 〇μηι, it is sometimes difficult to manufacture by emulsion polymerization. Also, if it is 0. 8 μιη小时, the balance between light transmittance and light diffusivity is poor. The "number average particle diameter" of the irregular particles in the present embodiment means the length of the diameter of the irregular particles with respect to the longest direction, and can be measured, for example, by a light scattering method. The mass ratio ((a) / (b)) of the heteromorphic particle system (a) particles to the (b) particles in the present embodiment is preferably 2/98 to 98/2, more preferably 5/95 to -21 - 200904860. (18) 95/5. Further, in the total surface area of the irregular particles, the ratio (area ratio = (a) / (b)) of (a) the exposed surface formed by the particles to the exposed surface formed by the particles (b) is preferably 5/95 to 95. /5, better for 10/90 to 90/10. When the ratio of any of the particles (a) and (b) particles is less than the above range, the shaped particles may not sufficiently obtain the effect of "alien". The ratio of the exposed surface of each primary particle to the total surface area of the shaped particle can be measured, for example, by an electron micrograph. The shape of the irregular particles varies depending on the mass ratio of (a) particles to (b) particles, (a) the separation between the particles and (b) particles, and the polymerization conditions in the case of forming (b) particles. For example, when the mass ratio of (a) particles to (b) particles and the polymerization conditions are constant, the shape of the shaped particles is increased according to Fig. 1 (B), as the separation of (a) particles and (b) particles increases. The tendency of the order of 1 (C) and Fig. 1 (A) changes. 2 . The heteromorphic particle composition and the method for producing the same: The embodiment of the heteromorphic particle composition of the present invention comprises the (A) shaped particle and the (B) binder component. The details are as follows. (B) Adhesive component The binder component contained in the irregular particle composition of the present embodiment is transparent, and at the same time, for example, the (A) shaped particles can be dispersed and integrated on the surface of a resin sheet or the like. The type is not particularly limited. Specific examples of the binder component include thermoplastics such as polyvinyl acetate, polyvinyl alcohol, polyvinyl chloride polyvinyl butyral, poly(meth)acrylate 'nitrocellulose-22-200904860 (19), and the like. Resin; thermosetting resin such as phenol resin, melamine resin, polyester resin, polyurethane resin, epoxy resin, etc. These binder components may be used alone or in combination of two or more. The total light transmittance of the binder component is preferably 80% or more, more preferably 90% or more. When the total light transmittance of the binder component is 80% or more, a light-diffusing molded article having more excellent light transmittance can be produced. The "total light transmittance" referred to in the present specification is 値 measured according to K 7 05. The ratio of the (B) binder component contained in the irregular particle composition of the present embodiment is 1 to 10,000 parts by mass, more preferably 2 to 5000 parts by mass, per 100 parts by mass of the (A) shaped particles. Good for 3 to 1 〇〇〇 by mass. (B) When the content of the binder component is less than 1 part by mass, for example, the (A) shaped particles tend to be dispersed and integrated on the surface of a resin-made sheet or the like. In addition, when the content ratio of the component (B) is more than 1 part by mass, the light-diffusing molded article produced by using the shaped particle composition has a tendency to be difficult to increase in light transmittance and light diffusibility. (Other components) The amorphous particle composition of the present embodiment may contain other components such as a curing agent, a dispersing agent, and a dye, in addition to the (A) shaped particles and the (B) binder component. The content ratio of the other components is preferably 0 to 〇 mass parts, more preferably 0 to 5 parts by mass, more preferably 0 to (A) shaped particles + (B) binder component = 1 〇〇 by mass. ~ 3 parts by mass. -23- 200904860 (20) (Manufacturing method of the irregular particle composition) When the irregular particle composition of the present embodiment is produced, the shaped particles obtained by the method for producing the irregular shaped particles are first desolvated to obtain a deformed particle in a dry state. (Step (1), the method of removing the solvent from the latex is not the freeze-drying method and the spray-drying method, and it is preferable because it can be in a simple state. The ratio of drying to the solvent is 5. 0% by mass to dry to 3. 0% by mass or less is more preferable. When the content of the solvent is higher than the mass%, the dispersibility of the binder component is lowered, and the molded article of the light diffusing function tends to be difficult. Next, the prepared irregular particles in the dry state are mixed (step (2)). In the step (2), the shaped particles, the fractions, and the other components added as needed are all obtained by the heteromorphic particle composition of the present embodiment. The mixing method of the other components is not particularly limited, and for example, it can be mixed using various kneaders, a high pressure homomixer, or the like. 3 . Light-diffusing molded article The first light-diffusing molded article of the present invention is composed of a resin material containing resin-forming particles. Further, in one embodiment of the first aspect of the present invention, the substrate layer and the light composed of the irregular particle composition formed on the other side are first removed from the latex containing the particles. This step is particularly limited. It is better to form a single dry, and if the dry 1J exceeds 5. 0 Made with a uniform binder composition and a mixture of binders can be mixed later. And a bead mill, which is divided into the diffusion layer of the substrate light into the substrate layer. -24- 200904860 (21) The details are as follows. (First Light-Diffusing Molded Article) The resin material constituting the first light-diffusing molded article contains a resin component and the above-mentioned shaped particles. The resin component is not particularly limited, but is preferably transparent to the visible light. Transparency includes colorless transparency and colored transparent, translucent mourning. When the resin component is formed into a sheet having a thickness of 200 μm, the light transmittance of the light-transmissive molded article is more preferably 80% or more, and more preferably 85% or more, particularly preferably 90% or more. . When the environment and the storage environment are considered, the glass transition temperature of the resin component is preferably 10 ° C or more, more preferably 120 ° C or more, and particularly preferably 150 ° C or more. Specific examples of the resin component include, for example, polyethylene terephthalate, polymethyl (meth) acrylate, polycarbonate, cycloolefin polymer, polyarylate, polyether mill, polystyrene, (methyl) a thermoplastic resin such as a methyl acrylate-styrene copolymer or a styrene-acrylonitrile copolymer; an epoxy resin, a vinyl ether resin, a (meth) acrylate having two or more (meth)acryl groups, A curable resin which can be hardened by heat or active energy rays, such as an oxetane resin or a vinyl ester resin. Among them, a curable resin which can be hardened by heat or active energy rays can be easily combined with a glass fiber or a glass fiber cloth and is preferably "heat-stable", and an epoxy resin having two or more (meth)acrylic groups ( Methyl) acrylate is preferred. The ratio of the irregular particles contained in the resin material is preferably from 1 to 1,000 parts by mass, more preferably from 1 to 500 mass to 25 to 200904860 (22) parts by weight of 100 parts by mass of the resin component, particularly preferably 1 to 1 part. 100 parts by mass. When the irregular particles contain tt parts by mass, the light diffusibility tends to be insufficiently improved. In the case of a part by mass, the light transmittance tends to be remarkably lowered. In the first light-diffusing molded article of the present embodiment, for example, the tree-shaped particles are supplied to an extruder, and the extrudate is used as a master batch, and then the extruder is injected into a cavity to perform molding processing or the like. The first light-diffusing molded article of the present embodiment has excellent properties and light diffusibility. Therefore, the first light diffusion of the present embodiment exhibits such characteristics and is suitable as a light guide plate, a light diffusion plate, and the like. (Second Light-Diffusing Molded Article) A specific example of a resin which is a layer base material layer composed of a transparent transparent, colored transparent or translucent resin, which is a base material layer constituting the second light-diffusing molded article, for example, It is the same as the resin component contained in the resin material constituting the first type. The light diffusion layer formed on at least one side of the substrate layer is a layer composed of a particle composition. The particles contained in the irregular particle composition are integrated on the base material layer by the adhesion contained in the same shaped particle composition. A part of the shaped particles may be in a state in which the surface of the component is partially protruded. Further, the shaped portion may be completely covered by the binder component, or only a part of the shaped particles may be completely buried in the binder component, and the L example is less than 1 and more than 1000 fat components are prepared by the method. The light is transmitted through the molded product-based light-diffusing film (colorless), and the light is diffused into the irregular shaped component of the shaped material, and is adhered and covered by the bonding: the state is also in the state. -26- 200904860 (23) The second light-diffusing molded article, for example, by dispersing or dissolving (A) shaped particles and (B) a binder component in (C) an organic solvent capable of dispersing or dissolving these components, forming a slurry, by various coating machines It is produced by coating and drying. (c) Specific examples of the organic solvent include, for example, water, toluene, cyclohexane, methyl isobutyl ketone (MIBK), methyl ethyl ketone (MEK), N-methyl-2. - Pyrrolidone (NMP), etc. (C) The content ratio of the organic solvent is preferably from 1 to 2000 parts by mass, more preferably from 20 to 2,000 parts by mass of the (a) shaped particles + (B) binder component = 100 parts by mass. 1 000 parts by mass. The thickness of the substrate layer is not particularly limited, usually Is 0. 03~0. 3mm, preferably 0. 05~0. 2 mm or so. Further, the thickness of the light diffusion layer is not particularly limited and is usually 0. 01~0. 1mm' is preferably 〇. 〇 2 ~ 〇. 〇 8mm or so. The second light-diffusing molded article of the present embodiment has excellent light transmittance and light diffusibility. Therefore, the second light-diffusing molding product of the present embodiment exhibits such a property as a light-diffusing sheet, a light-diffusing film, or the like. [Embodiment] [Examples] Hereinafter, the present invention will be specifically described based on examples, but the present invention is not limited by the examples. The "parts" and "%" in the examples and comparative examples indicate the quality standard unless otherwise stated. Further, the measurement methods of various physical properties and the evaluation methods of the properties are as follows. [Number average particle diameter]: It was measured using a laser particle size analysis system manufactured by Beckmann-Coulter Co., Ltd. (trade name "LS 1 3 3 2 0". -27- 200904860 (24) [Number of long diameters 値 (L) ) and the average number of short diameters (D)]: measured by SEM observation. [Total light transmittance]: A haze meter manufactured by Suga Test Machine Co., Ltd., in accordance with JI SK 7 1 0 5 ' (Air) was measured as 1%. [Haze]: It was measured in accordance with JIS K71 05 using a haze meter manufactured by Suga Test Instruments Co., Ltd. 1 . Synthesis of polymer particles (Example 1) 3,5,5-trimethylhexyl peroxide (trade name "?61^1 3 5 5"" manufactured by Nippon Oil Co., Ltd., water solubility: 〇·〇 〖%) 2 parts by mass, sodium lauryl sulfate 〇·1 part by mass, and 20 parts by mass of water were emulsified by stirring, and then micronized by an ultrasonic homogenizer to obtain an aqueous dispersion. Adding a number average particle size Ι to the prepared aqueous dispersion. 15 parts by mass of monodisperse polystyrene particles of Ομηη, and stirred for 16 hours. Then, '70 parts by mass of styrene (ST), 20 parts by mass of divinylbenzene (DVB), and 10 parts by mass of glycidyl methacrylate (GMA) were added, and the mixture was stirred at 40 ° C for 3 hours to monodisperse. The polystyrene particles absorb monomer components (ST, DVB, and GM A ). Then, the temperature was raised to 75 ° C, and polymerization was carried out for 3 hours to obtain a mortar containing the particles (a) composed of the first polymer. (a) The average number of particles is 1 . 8 μπι, almost no coagulum occurred. 22 parts by mass of the same aqueous dispersion as the aqueous dispersion described above and 20 parts by mass of the latex containing the above (a) particles (but in the form of solid portion -28-200904860 (25)) were stirred for 6 hours. Next, 90 parts by mass of Μ MA and 10 parts by mass of trimethylolpropane trimethacrylate (TMPMA) were added, and the mixture was stirred at 4 ° C for 3 hours to allow the (a) particles to absorb monomer components (MMa and TMPMA). Then, the temperature was raised to 75 ° C, and polymerization reaction was carried out for 3 hours to form (b) particles composed of the second polymer, thereby obtaining polymer particles (polymers composed of (a) particles and (b) particles (polymer ( A)) Latex. The shape of the polymer particles is a shape as shown in Fig. 1 (a) (a gourd shape, a pear shape or a snowman shape), (b) the number average particle diameter of the particles is Ιμηη, and the number average particle diameter of the polymer particles is 3. . 5μπι, ( L ) / ( D ) ratio 1 . 6, and La ( μιη ) / Lb ( μπι ) = 1. 9/2. 6, almost no coagulum. A scanning electron microscope (SEM) photograph of the obtained polymer particles is shown in Fig. 4. (Examples 2, 3, Comparative Examples 1 to 6) Except that the formulation of the first polymer and the second polymer was as shown in Table 1 (but Comparative Examples 1 and 2 did not form the second polymer), and the foregoing implementation In Example 1, latexes each containing polymer particles (polymers (B) to (I)) were obtained in the same manner. Various physical properties are shown in Table 1. However, the polymer (Η) (Comparative Example 5) is an agglomerate in which the polymer aggregates. -29- 200904860 (26) [1® Comparative Example 6 Polymer (I) (Ν § 1 1 1 ο 1 I 1 Comparative Example 5 Polymer (Η) 1 1 ο 1 1 1 I 1 Aggregation Comparative Example 4 Polymerization (G) (Ν 〇〇1 1 ο 0. 58 0. 82 卜 ci 0. 58/0. 82 Figure 1 (A) Comparative Example 3 Polymer (F) (Ν 〇 〇 1 1 § ο 0. 39 0. 43 0. 39/0. 43 Figure 1 (A) Comparative Example 2 Polymer (Ε) 1 1 ] 冢〇1 1 1 1 1 m *—Η 1 Comparative Example 1 Polymer (D) (Ν 〇〇1 1 1 1 1 1 1 ( N 1 Example 3 Polymer (C) κη 〇〇1 1 ο 1. 62 1. 91 1. 62/1. 92 Figure 1 (A) Example 2 Polymer (Β) (Ν 〇 〇 1 1 ο 1. 11 1. 56 1. 11/1. 56 Figure 1 (A) Example 1 Polymer (Α) 〇 〇 1 1 ο Ο) (N 1. 9/2. 6 Figure 1 (A) Monodisperse polystyrene particles DVB GMA MMA TMPMA First polymer 1 MMA ΤΜΡΜΑ (4) Particles (b) Particle particles overall (L) / (D) ratio B = S - / - NB = L Particle shape (4) Particles (first polymer) (a) Particles (first polymer) + (b) particles (second polymer) Number average particle diameter (β^η) 黯囵船枳§ ^^ -30- 200904860 ( 27) Preparation of a polymer composition (A) The latex was dried to obtain a powdery polymer (A). 50 parts by mass of mixed polymethyl methacrylate (polyMMA) (trade name "Parapet HR_L", manufactured by Kuraray Co., Ltd., melt index: 2 g/10 min) and 200 parts by mass of methyl isobutyl ketone (MIBK) The mixed liquid was added to 50 parts by mass of the above powdery polymer (A) to be dispersed to obtain a polymer composition. Next, the obtained polymer composition was uniformly layered on a substrate made of polyethylene terephthalate (PET) (total light transmittance··87. 3%, haze: 2. After 8%, thickness: 200 μm), the film was dried at 60 ° C for 3 hours to obtain a light-diffusing film having a light diffusion layer of 25 μm thick (Example 4). The obtained light diffusing film has a total light transmittance of 100% and a haze of 92. 4%, with a very good balance. (Examples 5 to 7 and Comparative Examples 7 to 1 2) The polymer composition was obtained in the same manner as in the above-described Example 4 except that the formulation shown in Table 2 was used. Further, each of the obtained polymer compositions ' was used in the same manner as in Example 4 to obtain a light-diffusing film (Examples 5 to 7 and Comparative Examples 7 to 12). The thickness, total light transmittance, and haze of the light-diffusing layer of the obtained light-diffusing film are shown in Table 2. -31 - 200904860 (28) [rNls haze (%) 92. 4 92. 6 91. 1 93. 2 92. 2 82. 2 88. 5 69. 3 71. 0 1 86. 0 L_______________ 00 (N 00 (N ! Total light transmittance (%) 〇 〇 ψ Η 99. 5 〇 — Η 89. 2 99. 7 99. 8 91. 4 94. 3 95. 1 87. 3 1_________________ 1- 88. 2 Light diffusion layer thickness (#m) (N 00 m P; ΓΟ 1 (N (N formulation prescription (parts) particle § 沄1 1 (polymer) ggg XQ g 〇1 1 solvent (MIBK) 〇200 200 200 200 200 200 200 200 200 1 1 Poly MMA (adhesive component) 1 1 Example 4 Example 5 Example 6 Example 7 Comparative Example 7 Comparative Example 8 Comparative Example 9 Comparative Example 10 Comparative Example Π Comparative Example 12 Substrate*1 Blank sample *2 ?7/(N(N:Mtt)ilv2s^+?7/00(N:^ft)lHd(N*(sy. Oo(N:^lil!) 13d:r -32- 200904860 (29) (Review) As shown in Fig. 4, the polymer particles (heteromorphic particles) obtained in Example 1 were obtained from two kinds of particles having different particle diameters. The overall shape is such that one of the particles is combined with another particle in a protrusion shape, so-called snowman shape (or gourd shape, western pear shape). As shown in Table 2, the light-diffusing films of Examples 4 to 7 produced using the polymer particles of Examples 1 to 3 were compared with Comparative Examples 7 to 1 prepared by using the polymer particles of Comparative Examples 1 to 4 and Comparative Example 6. The light diffusing film of 2 has excellent balance of total light transmittance and haze. The light-diffusing film of Comparative Example 9 was produced by simply mixing a mixture of the particles (A) and the polymer (B). As described above, it is apparent that it is difficult to increase the haze by mixing the different particles without using the irregular particles. Even if the shape of the particles is irregular, the light diffusing film of Comparative Example 10 and 1 1 made of the polymer (F) and the polymer (G) having a number average particle diameter of less than 8 μm is used. Both the transmission rate and the haze are low. [Industrial Applicability] The light-diffusing molded article of the present invention is suitable as a light guide plate, a light diffusion plate, and a light diffusion film. BRIEF DESCRIPTION OF THE DRAWINGS [Fig. 1 (A)] is a schematic view showing an embodiment of the shaped particles of the present invention. [Fig. 1 (B)] shows a pattern in which the particles grow and the shape changes. -33- 200904860 (30) [Fig. 1 (c)] shows a pattern in which the particle grows and the shape changes. Fig. 2 is a schematic view showing the major axis and the minor axis of the shaped particles. [Fig. 3 (A)] (b) shows a pattern diagram of the initial stage of particle growth of the dice. [Fig. 3 (B)] (b) shows a pattern diagram of the intermediate stage of the particle growth dice. [Fig. 3 (C)] (b) shows a pattern diagram of the final stage of particle growth. 4] A scanning electron microscope (S E Μ ) photograph of the polymer particles of Example 1. [Explanation of main component symbols] 1 ( a ): particle 2 ( b ): particle * 5 : shaped particle D : short diameter L : long diameter -34-