200948890 六、發明說明 【發明所屬之技術領域】 本發明係有關一種具備高反射率、且延伸性良好的白 色反射板用聚酯薄膜及在該薄膜上所設置的反射板用塗佈 聚酯薄膜。 【先前技術】 〇 液晶顯示裝置之背景光單位中所使用的反射板，被要 求高的反射性能。以往’該用途之薄膜係使用添加有白色 染料之薄膜、或添加白色顏料、在薄膜內部形成有微細氣 泡之白色薄膜（日本特開2004-050479號公報、特開 2004-3 3 0727號公報、特開平6-322 1 5 3號公報、特開平7· 11843 3號公報）。 然而，此等習知的白色薄膜，由於構成薄膜之聚合物 的聚酯或聚烯烴本身因來自冷陰極管之光中所含的紫外線 〇 而惡化，白色薄膜會有由原有的白色變成黃色的問題》 爲抑制該變黃情形時，提案有在白色薄膜上塗佈紫外 線吸收劑（日本特開2002-120330號公報）、在面向光源 側之表層中添加大量的顏料（日本特開2007-15315號公 報）。 【發明內容】 然而，爲此等之構成時，於背景光單位內部之使用環 境中，會有反射板產生翹曲情形，無法於長時間下使用。 -5 - 200948890 而且，反射板或反射鏡係以其構成構件組入背景光單 位中，惟爲使組裝製程之作業性變得容易時，在其反射面 上使用油墨實施點狀印刷。習知的白色薄膜，與油墨之密 接性不充分。 然後，於液晶顯示裝置之電源打開時，背景光單位內 之溫度因光源的熱度而急速上昇，惟此時反射板與其他構 件摩擦，產生令人不快的摩擦聲音。 此外，反射板必須爲可視光線之反射率高者，一般而 言，可見光線之反射率高的反射板，紫外線之反射率亦高 。冷陰極管之光係除可視光線外，亦包含紫外線，紫外線 之反射率高時，在反射板上可見光與紫外線同時被反射， 藉由被反射的紫外線，會使構成液晶顯示裝置之反射板附 近的其他構件產生惡化的可能性。 本發明係以解決此等之技術課題爲目的。 本發明之第一發明的課題，係提供一種延伸性良好， 且作爲液晶顯示裝置之背景光單位所使用的反射板，在使 用環境中所產生的翹曲情形經抑制的平面性優異之反射板 用聚酯薄膜。 本發明之第二發明的課題，係提供一種除上述特性外 ’具備抗靜電性、與點狀印刷時所使用的油墨之密接性優 異’作爲反射板組裝於背景光單位時，不會產生與其他構 件摩擦的聲音，在不會使反射板附近所配置的其他構件產 生惡化情形下，紫外線反射經抑制的反射板用塗佈聚酯薄 膜。 -6- 200948890 本發明之第三發明的課題，係提供一種具備抗靜電性 、與點狀印刷時所使用的油墨之密接性優異，作爲反射板 組裝於背景光單位時，不會產生與其他構件摩擦的聲音， 在不會使反射板附近所配置的其他構件產生惡化情形下， 紫外線反射經抑制的反射板用塗佈聚酯薄膜。 換言之，本發明之第一發明係爲一種反射板用聚酯薄 膜，其特徵爲由支撐層與設於其上之白色反射層所形成， ❹ 支撐層係由0.1〜10重量％硫酸鋇粒子及99.9〜90重量％ 含有以異苯二甲酸成分作爲共聚合成分之聚對苯二甲酸乙 二酯所形成，於每1〇〇之薄膜全體厚度中具有10〜40之 厚度，且白色反射層係由31〜60重量％硫酸鋇粒子及69 〜40重量％含有以異苯二甲酸成分作爲共聚合成分之聚對 苯二甲酸乙二酯所形成，於每100之薄膜全體厚度中具有 90〜60之厚度，且構成白色反射層之聚酯中所含的異苯二 甲酸成分之含有率與構成支撐層之聚酯中所含的異苯二甲 ❹ 酸成分之含有率的比例（構成白色反射層之聚酯中所含的 異苯二甲酸成分之含有率/構成支撐層之聚酯所含的異苯 二甲酸成分之含有率）爲1.5〜3.0。 其次，本發明之第二發明係爲一種反射板用塗佈聚酯 薄膜，其特徵爲由前述反射板用聚酯薄膜及在該薄膜上所 塗設的塗佈層所形成，該塗佈層係由15〜80重量％之具有 苯并三唑基之（甲基）丙烯酸樹脂、5〜50重量％之聚矽 氧化合物、15〜80重量％抗靜電劑所形成，厚度爲〇_〇2〜 0·2μιη之塗佈層。 200948890 另外，本發明之第三發明係爲一種反射板用塗佈聚酯 薄膜，其特徵爲由白色聚酯薄膜及在該薄膜上所塗設的塗 佈層所形成，該塗佈層係由15〜80重量％之具有苯并三唑 基之（甲基）丙烯酸樹脂、5〜50重量％之聚矽氧化合物 、15〜80重量％抗靜電劑所形成，厚度爲0.02〜0.2μηι之 塗佈層。 〔爲實施發明之最佳形態〕 於下述中，詳細說明本發明。 反射板用聚酯薄膜 於本發明中，反射板用聚酯薄膜係爲白色的聚酯薄膜 ，由支撐層與其上所設置的白色反射層所形成的積層薄膜 。於下述中詳細地說明有關各層。 支撐層 支撐層係由〇」〜10重量％硫酸鋇粒子及99.9〜90重 量％含有以異苯二甲酸成分作爲共聚合成分之聚對苯二甲 酸乙二酯的聚酯組成物所形成。藉由使支撐層之聚酯組成 物的硫酸鋇粒子在該範圍內，可保持處理性優異的充分平 滑性與作爲支撐白色反射層之支撐層的強度。 支撐層之共聚合聚對苯二甲酸乙二酯中異苯二甲酸成 分之共聚合量，較佳者爲2〜10莫耳％，更佳者爲4〜8莫 耳％。藉由使異苯二甲酸成分之共聚合量在該範圍內，可 -8 - 200948890 得良好的製膜性與作爲支撐層之優異的機械強度。 於支撐層之聚酯組成物中，視其所需亦可另外配合添 加劑。該添加劑例如螢光增白劑、抗氧化劑、紫外線吸收 劑。 白色反射層 白色反射層係由31〜60重量％硫酸鋇粒子及69〜4〇 φ 重量％含有以異苯二甲酸成分作爲共聚合成分之聚對苯二 甲酸乙二酯的聚酯組成物所形成。藉由使白色反射層之聚 酯組成物的硫酸鋇粒子在該範圍內，可得作爲反射板時、 即使長時間使用時仍不會有變黃現象之優異耐光性、與生 產性優異的製膜性。該共聚合聚對苯二甲酸乙二醋，於聚 酯組成物中以含有59〜40重量％較佳。此時，於聚醋組成 物中含有41〜60重量％硫酸鋇粒子。 含有以白色反射層之異苯二甲酸成分作爲共聚合成分 Φ 的共聚合聚對苯二甲酸乙二酯中，異苯二甲酸成分之共聚 合量以6〜1 8莫耳％較佳，以8〜1 2莫耳％更佳。藉由使 異苯二甲酸成分之共聚合量在該範圍內，可得良好的製@ 性與作爲白色反射層之優異的反射性。 於白色反射層之聚酯組成物中，視其所需亦可另外配 合添加劑。該添加劑例如螢光增白劑、抗氧化劑、紫外線 吸收劑。 異苯二甲酸成分之比例 -9- 200948890 於本發明中，構成白色反射層之聚酯中所含的異苯二 甲酸成分之含有率、與構成支撐層之聚酯中所含的異苯二 甲酸成分之含有率的比例（構成白色反射層之聚酯中所含 的異苯二甲酸成分之含有率（莫耳％)/構成支撐層之聚 酯中所含的異苯二甲酸成分之含有率（莫耳％))爲1.5 〜3.0，係極爲重要。該比例未達1.5時，使用作爲液晶顯 示裝置之背景光單位的反射板時，在使用環境中薄膜在白 色反射層側會有翹曲的情形。另外，大於3.0時，在支撐 層側會有翹曲情形。 厚度 支撐層係在每薄膜全體之厚度爲100時具有10〜40 之厚度。藉由使薄膜全體厚度中所佔的支撐層之厚度在該 範圍內，可得良好的製膜性與作爲支撐層之充分的機械強 度。 白色反射層係在每薄膜全體之厚度爲100時具有90〜 60之厚度。藉由使薄膜全體厚度中所佔的支撐層之厚度在 該範圍內，可確保良好的製膜性與作爲反射板之充分的反 射率。 本發明之反射板用聚酯薄膜的總厚度，以60〜400 μπι 較佳，以75〜300 μιη更佳，以100〜250 μπι最佳。藉由爲 該範圍之總厚度，可得作爲薄膜全體之高反射率與處理性 〇 其次，支撐層之厚度以10〜100 μπι較佳。藉由形成該 -10- 200948890 範圍之厚度，可得良好的製膜性與機械強度。白色反射層 之厚度以50〜3 ΟΟμιη較佳。藉由使白色反射層之厚度在該 範圍內，可確保高的反射率且得到良好的製膜性。 本發明之反射板用聚酯薄膜，特別是爲得高的反射性 時，以由支撐層與在其一面上所設置的白色反射層等2層 所構成者較佳。 0 硫酸鋇粒子 支撐層及白色反射層所使用的硫酸鋇粒子之平均粒徑 ，以0.1〜5μιη較佳，以0.5〜3μιη更佳，以0.6〜2μιη最 佳。藉由使用平均粒徑爲該範圍之硫酸鋇粒子，可在不會 產生微粒子之凝聚現象、且不會產生薄膜之斷裂情形下， 良好地生產製造薄膜。 本發明之反射板用聚酯薄膜，於延伸時白色反射層在 硫酸鋇粒子與共聚合聚酯之界面會引起剝離情形，且形成 ❹ 孔隙。 平均反射率及熱收縮率 本發明之反射板用聚酯薄膜，至少一方的表面之反射 率，以波長爲400〜700μιη之平均反射率爲90%以上’較 佳者爲92%以上，更佳者爲94%以上。藉由具備該平均反 射率，可得高亮度。 而且，本發明之反射板用聚酯薄膜，在85°C之熱收縮 率以垂直的2方向皆爲0.5%以下較佳，以〇·4%以下更佳 200948890 ，以0.3%以下最佳。藉由具備該熱收縮率，即使於長期 間使用，仍可得亮度斑少的反射板。 塗佈層 本發明第二發明之反射板用塗佈聚酯薄膜中，塗佈層 係塗設於反射板用聚酯薄膜上，較佳者塗設於反射板用聚 酯薄膜之白色反射層上。藉此，使用薄膜作爲液晶顯示裝 置之反射板時，藉由孔隙形成物質所形成的白色層之表面 突起，可減低與其他構件摩擦時產生的聲音。而且，塗佈 層可設置於白色聚酯薄膜之一面上、或兩面上。 本發明第三發明之反射板用塗佈聚酯薄膜中，塗佈層 被設置於白色聚酯薄膜上。 該塗佈層係爲由15〜80重量％之具有苯并三唑基之（ 甲基）丙烯酸樹脂、5〜50重量％之聚矽氧化合物、15〜 80重量％之抗靜電劑所形成的厚度爲0.02〜0·2μιη之塗佈 層。 塗佈層之厚度係乾燥後之厚度爲0.02〜0.2 μιη，較佳 者爲0.03〜Ο.ίμιη。未達0·02μιη時，會使紫外線吸收性能 及抗靜電性變得不充分，另外，大於〇.2μιη時，會使塗佈 斑變得明顯，導致塗佈外觀惡化。 具有苯并三唑基之（甲基）丙烯酸樹脂 塗佈層係在每100重量％塗佈層之組成物中含有15〜 80重量％ (較佳者爲30〜70重量％ )具有苯并三唑基之（ -12- 200948890 甲基）丙烯酸樹脂。該具有苯并三唑基之（甲基）丙烯酸 樹脂，作用爲紫外線吸收劑。未達15重量％時，紫外線吸 收性能變得不充分，另外，即使大於8 0重量％，紫外線吸 收性能已飽和，故不具任何意義，而且，相對地使抗靜電 劑之量變少，抗靜電性能變得不充分，導致薄膜表面上容 易附著塵埃。 苯并三唑基係在（甲基）丙烯酸樹脂之側鏈上，其含 0 量係在每100莫耳％構成（甲基）丙烯酸樹脂之（甲基） 丙烯酸單體中，例如爲10〜80莫耳％、較佳者爲20〜70 莫耳％。 本發明之反射板用塗佈聚酯薄膜，藉由在塗佈層上存 在有該範圍內之苯并三唑基，可使365nm之全光線反射率 爲80%以下，較佳者爲70%以下。 聚砍氧化合物 Φ 塗佈層係在每100重量％塗佈層之組成物中，含有5 〜50重量％之聚矽氧化合物，較佳者爲10〜30重量％。聚 矽氧化合物未達5重量％時，平滑性不充分，大於50重量 %時，無法得到與UV油墨之良好的密接性。 於本發明中，聚矽氧化合物係爲以有機基矽氧烷爲架 構之化合物，例如二甲基聚矽氧、甲基苯基聚矽氧、甲基 氫聚矽氧、氟化聚矽氧、聚矽氧聚醚共聚物、烷基改性聚 矽氧、高級脂肪酸改性聚矽氧。 使用具有反應性基之聚矽氧化合物作爲聚矽氧化合物 -13- 200948890 時’可使塗佈層沒有脫落情形，可長期、安定地維持平滑 性或抗靜電性，不會因脫落成分對生產步驟引起污染情形 下，可以高生產性進行生產較佳。 抗靜電劑 塗佈層係在每100重量％塗佈層之組成物中含有15〜 80重量％之抗靜電劑，較佳者爲30〜70重量％。未達15 重量％時，抗靜電劑變得不充分，在薄膜表面上容易附著 塵埃，另外，大於80重量％時，無法含有充分量之紫外線 吸收劑，紫外線吸收性能不充分。 該抗靜電劑係爲賦予抗靜電性之劑，較佳者使用陽離 子聚合物，較佳者使用由乙烯系聚合物所形成、在側鏈上 具有陽離子性基，且該陽離子性基爲四級銨鹽之化合物。 四級銨鹽例如四級銨磺酸鹽、四級銨硫酸鹽、四級銨 硝酸鹽。 本發明之反射板用塗佈聚酯薄膜，藉由在塗膜中配合 抗靜電劑，可達成表面固有電阻爲1χ1012Ω/□以下，較佳 者爲ΙχΙΟ^Ω/□以下。 界面活性劑 塗佈層以使用水性塗液所設置者較佳。此時，爲形成 塗佈層時之塗佈液時，以配合塗佈層之組成物與化學惰性 的界面活性劑較佳。配合界面活性劑時，例如在每100重 量％塗佈層之組成物中配合1〜20重量％ ’較佳者爲10〜 -14- 200948890 20重量％。藉由在該範圍內配合時，可促進水性塗佈液對 聚酯薄膜之濕潤性，且提高塗佈液之安定性。 界面活性劑例如聚氧化乙烯-脂肪酸酯、山梨糖醇酐 脂肪酸酯、丙三醇脂肪酸酯、脂肪酸金屬皂、烷基硫酸鹽 、烷基磺酸鹽、烷基磺基琥珀酸鹽等之陰離子型、非離子 型界面活性劑。 φ 添加劑 於塗佈層中，亦可配合在不會妨礙發明效果之量的添 加劑。該添加劑例如螢光增白劑、抗氧化劑。 製造方法 於下述中，說明本發明第一發明之反射板用聚酯薄膜 的製造方法例。 硫酸鋇粒子對共聚合聚酯薄膜之配合，可在聚酯聚合 φ 時進行，亦可在聚合後進行。於聚合時進行時，可於酯交 換反應或酯化反應完成前配合，亦可於聚縮合反應開始前 配合。 於聚合後進行時，添加於聚合後之聚酯中且進行熔融 混練處理。此時，藉由製造以較高濃度含有硫酸鋇粒子之 主要粒料，且使該物配合於不含硫酸鋇粒子之聚酯粒料中 ，製得以企求的含有率含有硫酸鋇粒子之聚酯組成物。 本發明係以使用由線徑15 μιη以下之不銹鋼細線所形 成的平均網目爲10〜1〇〇 μηι (較佳的平均網目爲20〜 -15- 200948890 50 μιη)之不織布型過濾器作爲製膜時之過濾器，過濾聚酯 組成物較佳。藉由進行該過濾，一般而言可抑制容易凝聚 形成粗大凝聚粒子之粒子凝聚現象，製得粗大異物少的薄 膜。 藉由使自塑模所熔融的聚酯組成物藉由使用供應區之 同時多層押出的方法，製造積層未延伸薄片。換言之，使 構成白色反射層之聚酯組成物的熔融物、與構成支撐層之 聚酯組成物的熔融物，使用供應區以使白色反射層/支撐 層積層下，在塑模中展開且實施押出處理。此時，以供應 區所積層的聚酯組成物維持經積層的形態。 於下述中，聚酯之玻璃轉移溫度稱爲Tg、熔點稱爲BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyester film for a white reflecting plate having high reflectance and excellent elongation, and a coated polyester film for a reflecting plate provided on the film. . [Prior Art] The reflecting plate used in the backlight unit of the liquid crystal display device is required to have high reflection performance. In the conventional film, a film containing a white dye or a white pigment is added, and a white film having fine bubbles is formed in the film (Japanese Laid-Open Patent Publication No. 2004-050479, No. 2004-3 30727, Japanese Patent Laid-Open No. Hei 6-322 1 5 No. 3, JP-A No. 7-11843-3). However, in such conventional white films, since the polyester constituting the polymer of the film or the polyolefin itself is deteriorated by the ultraviolet ray contained in the light from the cold cathode tube, the white film may be changed from the original white to the yellow film. In order to suppress the yellowing, it is proposed to apply a UV absorber to a white film (JP-A-2002-120330) and to add a large amount of pigment to the surface layer facing the light source side (JP-2007) Bulletin No. 15315). SUMMARY OF THE INVENTION However, in the case of such a configuration, in the use environment inside the backlight unit, there is a case where the reflecting plate is warped and cannot be used for a long time. -5 - 200948890 Further, the reflecting plate or the mirror is incorporated into the backlight unit by the constituent members. However, when the workability of the assembly process is facilitated, dot printing is performed on the reflecting surface using the ink. The conventional white film has insufficient adhesion to the ink. Then, when the power of the liquid crystal display device is turned on, the temperature in the backlight unit rises rapidly due to the heat of the light source, but at this time, the reflecting plate rubs against other members to generate an unpleasant rubbing sound. In addition, the reflector must have a high reflectance of visible light. In general, a reflector having a high reflectance of visible light has a high reflectance of ultraviolet light. In addition to visible light, the cold cathode tube also contains ultraviolet light. When the reflectance of ultraviolet light is high, visible light and ultraviolet light are simultaneously reflected on the reflecting plate, and the reflected ultraviolet light causes the vicinity of the reflecting plate constituting the liquid crystal display device. Other components produce the possibility of deterioration. The present invention has an object of solving the technical problems of the above. An object of the first aspect of the present invention is to provide a reflecting plate which is excellent in stretchability and which is used as a backlight unit of a liquid crystal display device, and which is excellent in flatness which is suppressed in warpage in a use environment. Use a polyester film. According to a second aspect of the present invention, in addition to the above-described characteristics, it is provided that "the antistatic property is excellent and the ink used in dot printing is excellent in adhesion", and when it is incorporated in a backlight unit as a reflector, it does not occur. The sound of the friction of the other members is a coated polyester film for the reflecting plate which is suppressed by the ultraviolet rays without causing deterioration of other members disposed in the vicinity of the reflecting plate. -6- 200948890 The problem of the third invention of the present invention is to provide an antistatic property and excellent adhesion to ink used in dot printing, and when it is incorporated in a backlight unit as a reflector, it does not occur. The sound of the member rubbing reflects the coated polyester film for the reflecting plate which is suppressed by the ultraviolet rays without causing deterioration of other members disposed in the vicinity of the reflecting plate. In other words, the first invention of the present invention is a polyester film for a reflector, which is characterized in that the support layer is formed of a white reflective layer provided thereon, and the support layer is composed of 0.1 to 10% by weight of barium sulfate particles and 99.9 to 90% by weight, comprising polyethylene terephthalate containing a component of isophthalic acid as a copolymerization component, having a thickness of 10 to 40 per 1 inch of the total thickness of the film, and a white reflective layer It is formed of 31 to 60% by weight of barium sulfate particles and 69 to 40% by weight of polyethylene terephthalate containing an isophthalic acid component as a copolymerization component, and has 90 to 60 in a total thickness of 100 films. The ratio of the content of the isophthalic acid component contained in the polyester constituting the white reflective layer to the content ratio of the isophthalic acid component contained in the polyester constituting the support layer (constituting the white reflection) The content ratio of the isophthalic acid component contained in the polyester of the layer/the content of the isophthalic acid component contained in the polyester constituting the support layer is 1.5 to 3.0. Next, a second invention of the present invention is a coated polyester film for a reflecting sheet, which is characterized in that the polyester film for a reflecting plate and a coating layer coated on the film are formed, the coating layer It is formed by 15 to 80% by weight of a (meth)acrylic resin having a benzotriazole radical, 5 to 50% by weight of a polyfluorene oxide compound, and 15 to 80% by weight of an antistatic agent, and has a thickness of 〇_〇2. ~ 0. 2μιη coating layer. 200948890 In addition, the third invention of the present invention is a coated polyester film for a reflecting sheet, which is characterized in that it is formed of a white polyester film and a coating layer coated on the film, the coating layer is composed of 15 to 80% by weight of a (meth)acrylic resin having a benzotriazolyl group, 5 to 50% by weight of a polyfluorene oxide compound, 15 to 80% by weight of an antistatic agent, and a thickness of 0.02 to 0.2 μm Cloth layer. [Best Mode for Carrying Out the Invention] Hereinafter, the present invention will be described in detail. Polyester film for reflecting plate In the present invention, the polyester film for a reflecting plate is a white polyester film, and a laminated film formed of a supporting layer and a white reflecting layer provided thereon. The respective layers are explained in detail below. Support layer The support layer is formed of a polyester composition of 聚10% by weight of barium sulfate particles and 99.9 to 90% by weight of polyethylene terephthalate containing a component of isophthalic acid as a copolymerization component. By setting the barium sulfate particles of the polyester composition of the support layer in this range, it is possible to maintain sufficient smoothness and excellent strength as a support layer for supporting the white reflective layer. The copolymerization amount of the isophthalic acid component in the copolymerized polyethylene terephthalate of the support layer is preferably 2 to 10 mol%, more preferably 4 to 8 mol%. By setting the amount of the copolymerization of the isophthalic acid component within this range, good film formability and excellent mechanical strength as a support layer can be obtained from -8 to 200948890. In the polyester composition of the support layer, an additive may be additionally blended as needed. Such additives are, for example, fluorescent whitening agents, antioxidants, and ultraviolet absorbing agents. The white reflective layer white reflective layer is composed of 31 to 60% by weight of barium sulfate particles and 69 to 4% by weight of a polyester composition containing polyethylene terephthalate having a copolymerization component of an isophthalic acid component. form. When the barium sulfate particles of the polyester composition of the white reflective layer are in this range, it is possible to obtain excellent light resistance and excellent productivity without causing yellowing even when used as a reflector for a long period of time. Membrane. The copolymerized polyethylene terephthalate is preferably contained in the polyester composition in an amount of from 59 to 40% by weight. At this time, 41 to 60% by weight of barium sulfate particles are contained in the polyester composition. In the copolymerized polyethylene terephthalate containing the isophthalic acid component of the white reflective layer as the copolymerization component Φ, the copolymerization amount of the isophthalic acid component is preferably 6 to 18 mol%, 8 to 1 2 moles is better. When the amount of the copolymerization of the isophthalic acid component is within this range, good properties and excellent reflectivity as a white reflective layer can be obtained. In the polyester composition of the white reflective layer, an additive may be additionally added as needed. The additive is, for example, a fluorescent whitening agent, an antioxidant, or an ultraviolet absorber. Ratio of the components of the isophthalic acid-9-200948890 In the present invention, the content of the isophthalic acid component contained in the polyester constituting the white reflective layer and the isophthalic acid contained in the polyester constituting the support layer The ratio of the content of the formic acid component (the content of the isophthalic acid component contained in the polyester constituting the white reflective layer (% by mole) / the content of the isophthalic acid component contained in the polyester constituting the support layer The rate (% by mole) is 1.5 to 3.0, which is extremely important. When the ratio is less than 1.5, when a reflecting plate as a backlight unit of a liquid crystal display device is used, the film may be warped on the side of the white reflective layer in the use environment. Further, when it is more than 3.0, there is a warpage on the side of the support layer. The thickness of the support layer has a thickness of 10 to 40 when the thickness of the entire film is 100. By making the thickness of the support layer occupied by the entire thickness of the film within this range, good film formability and sufficient mechanical strength as a support layer can be obtained. The white reflective layer has a thickness of 90 to 60 when the thickness of the entire film is 100. By setting the thickness of the support layer in the entire thickness of the film within this range, it is possible to ensure good film formability and a sufficient reflectance as a reflector. The total thickness of the polyester film for a reflecting plate of the present invention is preferably 60 to 400 μm, more preferably 75 to 300 μm, and most preferably 100 to 250 μm. By the total thickness of the range, high reflectance and handleability as a whole film can be obtained. Next, the thickness of the support layer is preferably 10 to 100 μm. By forming the thickness of the range of -10 200948890, good film formability and mechanical strength can be obtained. The thickness of the white reflective layer is preferably 50 to 3 Å μηη. By making the thickness of the white reflective layer within this range, high reflectance can be ensured and good film forming properties can be obtained. The polyester film for a reflecting plate of the present invention is preferably composed of two layers of a support layer and a white reflective layer provided on one surface thereof in order to obtain high reflectivity. 0 Barium sulfate particles The average particle diameter of the barium sulfate particles used for the support layer and the white reflective layer is preferably 0.1 to 5 μm, more preferably 0.5 to 3 μm, and most preferably 0.6 to 2 μm. By using barium sulfate particles having an average particle diameter within this range, it is possible to favorably produce a film without causing agglomeration of fine particles and without causing breakage of the film. In the polyester film for a reflecting plate of the present invention, the white reflecting layer causes a peeling at the interface between the barium sulfate particles and the copolymerized polyester at the time of stretching, and forms a crucible. Average reflectance and heat shrinkage rate The reflectance of at least one surface of the polyester film for a reflector of the present invention has an average reflectance of 90% or more at a wavelength of 400 to 700 μm, preferably 92% or more, more preferably More than 94%. By having this average reflectance, high brightness can be obtained. Further, the polyester film for a reflecting plate of the present invention preferably has a heat shrinkage ratio at 85 ° C of 0.5% or less in both directions of the vertical direction, more preferably 〇 4% or less, and most preferably 0.348890 or less. By having this heat shrinkage rate, a reflector having a small number of brightness spots can be obtained even when used for a long period of time. Coating layer In the coated polyester film for a reflecting plate according to a second aspect of the present invention, the coating layer is applied to a polyester film for a reflecting plate, preferably a white reflecting layer coated on a polyester film for a reflecting plate. on. Thereby, when a film is used as the reflection plate of the liquid crystal display device, the surface protrusion of the white layer formed by the pore-forming substance can reduce the sound generated when rubbing against other members. Further, the coating layer may be provided on one side or both sides of the white polyester film. In the coated polyester film for a reflecting plate according to a third aspect of the invention, the coating layer is provided on a white polyester film. The coating layer is formed by 15 to 80% by weight of a (meth)acrylic resin having a benzotriazole radical, 5 to 50% by weight of a polyfluorene oxide compound, and 15 to 80% by weight of an antistatic agent. A coating layer having a thickness of 0.02 to 0. 2 μm. The thickness of the coating layer is 0.02 to 0.2 μm after drying, preferably 0.03 to Ο. ίμιη. When it is less than 0·02 μm, the ultraviolet absorbing performance and the antistatic property are insufficient, and when it is more than 〇2 μm, the coating spot is noticeable, and the coating appearance is deteriorated. The (meth)acrylic resin coating layer having a benzotriazole group is contained in an amount of 15 to 80% by weight (preferably 30 to 70% by weight) per 100% by weight of the composition of the coating layer, and has a benzotriene Azolyl ( -12- 200948890 methyl) acrylic resin. The (meth)acrylic resin having a benzotriazole group functions as an ultraviolet absorber. When the amount is less than 15% by weight, the ultraviolet absorbing performance is insufficient, and even if it is more than 80% by weight, the ultraviolet absorbing performance is saturated, so that it does not have any meaning, and the amount of the antistatic agent is relatively small, and the antistatic property is obtained. It becomes insufficient, resulting in easy adhesion of dust on the surface of the film. The benzotriazole group is on the side chain of the (meth)acrylic resin, and the amount of the benzotriazole group is in the (meth)acrylic monomer of the (meth)acrylic resin per 100 mol%, for example, 10~ 80% by mole, preferably 20 to 70% by mole. In the coated polyester film for a reflecting plate of the present invention, by having a benzotriazole group in the range on the coating layer, the total light reflectance at 365 nm can be 80% or less, preferably 70%. the following. The polyoxycride compound Φ coating layer contains 5 to 50% by weight of a polyoxyxene compound per 100% by weight of the coating layer, preferably 10 to 30% by weight. When the amount of the polyoxymethylene compound is less than 5% by weight, the smoothness is insufficient, and when it is more than 50% by weight, good adhesion to the UV ink cannot be obtained. In the present invention, the polyoxymethylene compound is a compound based on an organic fluorinated alkane, such as dimethyl polyfluorene oxide, methyl phenyl polyoxynium, methyl hydrogen polyoxyn oxide, or fluorinated polyoxyl , polyoxyl polyether copolymer, alkyl modified polyoxane, higher fatty acid modified polyfluorene. When a polyfluorene compound having a reactive group is used as the polyoxyl compound-13-200948890, the coating layer can be prevented from falling off, and the smoothness or antistatic property can be maintained for a long period of time without stability. In the case where the step causes contamination, it is preferable to carry out production with high productivity. Antistatic Agent The coating layer contains 15 to 80% by weight of an antistatic agent per 100% by weight of the composition of the coating layer, preferably 30 to 70% by weight. When the amount is less than 15% by weight, the antistatic agent becomes insufficient, and dust adheres easily on the surface of the film. When the amount is more than 80% by weight, a sufficient amount of the ultraviolet absorber cannot be contained, and the ultraviolet absorbing performance is insufficient. The antistatic agent is an agent for imparting antistatic properties, preferably a cationic polymer, preferably a vinyl polymer, a cationic group in a side chain, and a cationic group of four. A compound of an ammonium salt. Tertiary ammonium salts such as quaternary ammonium sulfonates, quaternary ammonium sulfates, and quaternary ammonium nitrates. In the coated polyester film for a reflector of the present invention, by incorporating an antistatic agent into the coating film, the surface specific resistance can be 1 χ 1012 Ω / □ or less, preferably ΙχΙΟ Ω / □ or less. Surfactant The coating layer is preferably provided by using an aqueous coating liquid. In this case, in order to form a coating liquid in the case of coating a layer, it is preferable to mix the composition of the coating layer with a chemically inert surfactant. When the surfactant is blended, for example, it is blended in an amount of 1 to 20% by weight, preferably 10 to -14 to 200948890, 20% by weight, per 100 parts by weight of the coating layer. When it is blended in this range, the wettability of the aqueous coating liquid to the polyester film can be promoted, and the stability of the coating liquid can be improved. Surfactants such as polyoxyethylene-fatty acid esters, sorbitan fatty acid esters, glycerol fatty acid esters, fatty acid metal soaps, alkyl sulfates, alkyl sulfonates, alkyl sulfosuccinates, etc. Anionic, nonionic surfactant. The φ additive may be blended in the coating layer in an amount which does not impair the effects of the invention. The additive is, for example, a fluorescent whitening agent or an antioxidant. (Manufacturing Method) An example of a method for producing a polyester film for a reflecting plate according to the first invention of the present invention will be described below. The blending of the barium sulfate particles with the copolymerized polyester film can be carried out when the polyester is polymerized at φ or after the polymerization. When it is carried out during the polymerization, it may be blended before the completion of the ester exchange reaction or the esterification reaction, or may be blended before the start of the polycondensation reaction. When it is carried out after the polymerization, it is added to the polymerized polyester and subjected to melt kneading treatment. At this time, by producing a main pellet containing barium sulfate particles at a relatively high concentration and blending the same with the polyester pellets containing no barium sulfate particles, the desired content of the polyester containing barium sulfate particles is obtained. Composition. In the present invention, a non-woven filter having an average mesh size of 10 to 1 〇〇μηι (preferably an average mesh of 20 to -15-200948890 50 μm) formed by a stainless steel fine wire having a wire diameter of 15 μm or less is used as a film formation. In the case of a filter, it is preferred to filter the polyester composition. By carrying out this filtration, it is generally possible to suppress the aggregation of particles which are easily aggregated to form coarse aggregated particles, and to obtain a film having a small amount of foreign matter. The laminated unstretched sheet is produced by a method in which the polyester composition melted from the mold is extruded in a plurality of layers while using the supply region. In other words, the melt of the polyester composition constituting the white reflective layer and the melt of the polyester composition constituting the support layer are used in a supply region to laminate the white reflective layer/support layer, and are developed and implemented in the mold. Execution processing. At this time, the polyester composition laminated in the supply zone is maintained in a laminated form. In the following, the glass transition temperature of polyester is called Tg, and the melting point is called
Tm。 自塑模所押出的未延伸薄片，係以鑄造桶予以冷卻固 化，形成未延伸薄膜。使該未延伸薄膜以輥加熱、紅外線 加熱等進行加熱，朝縱方向延伸，製得縱延伸薄膜。該延 伸係以利用2個以上的輥之周速差予以進行者較佳。 延伸溫度係以Tg以上之溫度較佳，以Tg〜（Tg + 7〇 )°C之範圍的溫度更佳。延伸倍率係視用途之要求特性而 定，惟縱方向、與縱方向垂直的方向（以下稱爲橫方向） 皆以2_2〜4.0倍較佳’以2.3〜3.9倍更佳。未達2.2倍時 ，薄膜之厚度斑惡化、無法製得良好的薄膜，大於4 〇倍 時’於製膜中容易產生破裂情形’故不爲企求。縱延伸後 之薄膜’繼續順序進行橫延伸、熱固定、熱鬆弛處理，形 成二軸配向薄膜，惟此等處理係使薄膜行走且進行。橫延 -16- 200948890 伸處理係自較聚酯之Tg更高的溫度開始進行。然後，在 (Tg + 5 )〜（Tg + 70 ) °C之範圍中之任何溫度爲止，予以 昇溫且進行。在橫延伸過程中可連續進行昇溫，亦可分段 式（逐次）進行昇溫，惟通常爲逐次昇溫。例如藉由使拉 幅器之橫延伸區域沿著薄膜行走方向分爲數區，在每區中 流通所定溫度之加熱媒體，予以昇溫。橫延伸之倍率，亦 可視該用途之要求特性予以決定，較佳者爲2.5〜4.5倍， φ 更佳者爲2.8〜3.9倍。未達2.5倍時，薄膜之厚度惡化， 無法製得良好的薄膜，大於4.5倍時，於製膜中容易產生 破裂情形。 橫延伸後之薄膜，可在兩端固定下、以（Tm - 20 ) °C 〜（Tm- 100 ) °C之溫度範圍內，以定寬或減少10%以下 之寬度下進行熱處理以降低熱收縮率。藉此，在高溫度下 會有薄膜之平面性惡化、厚度斑變大的情形，不爲企求。 而且，熱處理溫度較（Tm — 100) °C更低時，熱收縮率變 〇 大，故不爲企求。 此外，於熱固定後，在使薄膜溫度回復至室溫的過程 中，爲調整熱收縮量時，可切斷固定的薄膜兩端，且調整 薄膜縱方向之拉取速度，朝縱方向鬆弛。鬆弛的方法，係 調整拉幅器出側之輥群的速度。鬆弛的比例，對拉幅器之 薄膜線速度而言進行降低輥群之速度，實施較佳者爲0.1 〜1.5%，更佳者爲0.2〜1.2%，最佳者爲0.3〜1.0%之速 度降低處理，以鬆弛薄膜，調整縱方向之熱收縮率。而且 ，薄膜橫方向亦可在切斷兩端爲止之過程中減少寬度，得 -17- 200948890 到企求的熱收縮率。 此處，使薄膜藉由逐次二軸延伸法進行延伸時，以例 示詳細說明，惟可以逐次二軸延伸法、同時二軸延伸法中 任一方法進行延伸。 該所得的本發明第二及第三發明之反射板用聚酯薄膜 ，由支撐層與在其一面上所設置的白色反射層等2層所構 成，亦可得到良好的平面性。 其次，說明本發明第二及第三發明之反射板用塗佈聚 酯薄膜的製造方法例。塗佈層形成時所使用的塗液，係以 水性塗佈液（例如水溶液、水分散液、乳化液）之形態使 用較佳。水性塗佈液之固成分濃度，通常爲20重量％以下 ，較佳者爲1〜10重量％。未達1重量％時，對聚酯薄膜 之塗佈性不充分，故不爲企求，大於20重量％時，塗液之 安定性或塗佈層之外觀惡化，故不爲企求。 水性塗佈液對聚酯薄膜之塗佈，可在任意階段中實施 ，惟以在聚酯薄膜之製造過程中實施較佳，以塗佈於配向 結晶化完成前之聚酯薄膜上更佳。 此處，配向結晶化完成前之聚酯，包含使未延伸薄膜 、未延伸薄膜朝縱方向或橫方向中任何一方予以配向的一 軸配向薄膜，再朝縱方向及橫方向之二方向予以低倍率延 伸配向者（最後朝縱方向或橫方向予以再延伸，完成配向 結晶化前之二軸延伸薄膜）。其中，未延伸薄膜或朝一方 向配向的一軸延伸薄膜上，塗佈上述組成物之水性塗液， 直接實施縱延伸及/或橫延伸與熱固定處理較佳。 -18- 200948890 使水性塗佈液塗佈於薄膜時，爲提高塗佈性時之預備 處理，在薄膜表面上實施例如電暈放電表面處理、火焰處 理、電漿處理之物理處理，或沒有預備處理時，在塗佈液 中配合與塗佈層之組成物爲化學惰性的界面活性劑較佳。 塗佈方法可使用習知任意的塗佈法。例如輥塗佈法、 照相凹版塗佈法、輥刷法、噴霧塗佈法、氣刀塗佈法、含 浸法、簾幕塗佈法。此等可單獨或組合使用。 0 藉由該所得的本發明之反射板用塗佈聚酯薄膜，可使 至少一方的表面之反射率達到在波長爲400〜700nm之平 均反射率爲90%以上’較佳者爲92%以上，最佳者爲94% 以上。爲該範圍之反射率時，使用作爲液晶顯示裝置之背 景光單位的反射板時，可得高亮度。 【實施方式】 於下述中，藉由實施例詳細地說明本發明。而且，測 〇 定及評估係以下述之方法進行。 (1) 薄膜厚度 使薄膜試樣以電子微測器（Anritsu製K-402B)測定 10點之厚度，以平均値作爲薄膜之厚度》 (2) 各層之厚度 使薄膜試樣切成三角形，固定於包埋膠囊後，以環氧 樹脂包埋。然後，使經包埋的薄膜試樣以微切片裝置（ •19- 200948890 UL-TRACUT-S )朝縱方向使平行的截面予以薄膜切片後， 使用光學顯微鏡觀察照相，由照片測定各層之厚度比’由 薄膜試樣全體之厚度計算，求取各層之厚度。 (3 )反射率 (3 -1 )反射率（％ ) 在分光光度計（島津製作所製UV-3101PC)上設置積 分球，以BaS04白板爲100%時、薄膜之反射率在400〜 7 0 0nm下測定，由所得的圖表、以2nm之間隔讀取反射率 。而且，有關A層（白色反射層）/ B層（支撑層）之二 層構成的薄膜，以A層（白色反射層）作爲反射面進行測 定。 (3-2 ) UV 反射率（％ ) 在分光光度計（島津製作所製UV-3 101PC)上設置積 分球，以BaS〇4白板爲1〇0%時' 薄膜之反射率（％)在 波長365nm下測定。而且’有關A層（白色反射層）/ b 層（支撐層）之二層構成的薄膜’以A層（白色反射層） 作爲反射面進行測定。 (4 )延伸性 以縱方向2.5〜3.4倍、橫方向3.5〜37倍進行延伸 、製膜，觀察是否可安定地製膜，以下述基準進行評估。 〇：可安定地製膜1小時以上 -20- 200948890 X :經過未達1小時前產生切斷情形、無法安定地製膜 (5 )玻璃轉移點（Tg )、熔點（Tm ) 使用不差掃描熱量測定裝置（ΤΑ Instruments 2100 DSC)，以昇溫速度20m/分進行測定。 (6) 薄膜試樣對背景光單位之組裝 Q 由評估用液晶電視（SHARP公司製 AQUOS-2〇V )之 正下方型背景光（20吋）單位，取出原有組裝的光反射薄 片’組裝測定對象之薄膜試樣。而且，有關A層（白色反 射層）/ B層（支撐層）之二層構成的薄膜，以a層（白 色反射層）爲反射面進行組裝。 (7) 反射板方面之亮度 使背景光單位之發光面分成2x2之4個區域，於點燈 Ο 1小時後之正面亮度使用TOPCON公司製之BM-7進行測 定。測定角爲Γ 、亮度計與背景光單位發光面之距離爲 5〇cm。求取背景光單位發光面之面內4個亮度之單純平均 値作爲亮度。 (8) 薄膜之翹曲情形 使薄膜朝製膜方向切成長度200mm、朝寬度方向切成 長度5〇mm之長方形，作爲翹曲情形測定用之薄膜試樣。 而且，以與薄膜之製膜方向垂直的方向稱爲寬度方向。薄 -21 - 200948890 膜試樣爲垂直下，使薄膜試樣較短的一邊（以下稱爲上端 短邊）固定，垂吊薄膜試樣。該固定係使固定部分以寬度 50mm、深度5mm之夾子，使上端短邊以寬度50mm、深 度5mm之範圍固定予以進行。此時，試樣之另一短邊（ 以下稱爲下端短邊），設置於上端短邊之下方。在該狀態 下使薄膜試樣進行熱處理。該熱處理係使薄膜試樣在85°C 之烤箱中，無緊張狀態下保持30分鐘，然後，自烤箱中 取出，在25 °C之環境中進行冷卻10分鐘。藉由該熱處理 @ ，使薄膜試樣產生翹曲情形，下端短邊自原來的位置移動 。藉由測定自上端短邊垂直向下之面、與下端短邊之距離 ，測定翹曲程度。該距離如表中之「翹曲」一欄所示。 (9 )薄膜之平面性 自評估用液晶電視（SHARP公司製 AQUOS-65V )之 正下方型背景光（65吋）單位，取出原有組裝的光反射薄 片，組裝測定對象之薄膜試樣。此時，以A層（白色反射 ◎ 層）爲反射面進行組裝。 打開電源、放置24小時後，取出評估用試樣，特別 是在平面精度高且附有空氣除去孔專用的平板上分佈評估 用試樣，使薄膜與平板上之空氣藉由自然放置3分鐘以上 予以減少後，測定各產生的薄膜之浮出部分的製膜方向長 度最大値，求取其合計値。 (10)雜音 -22- 200948890 使背景光高水平爲2〇dB以下之環境中’在薄膜試樣 上重疊丙烯酸板（ACRYLITE® L N865 )，於其上載負錘 ，使薄膜以一定速度（10cm/分）進行拉伸’此時所產生 的異音自錘' 以距離3 0 cm之麥克風予以集音。產生40 dB 以上之異音時稱爲雜音，僅產生未達4 OdB之雜音時’稱 爲沒有雜音。而且’有關A層（白色反射層）/B層（支 撐層）之二層構成的薄膜，在A層（白色反射層）側上重 ❹ 疊丙烯酸板。〇、△具有實用性能。 〇：以3kg之錘沒有產生雜音情形、以5kg之錘沒有 產生雜音情形。 △:以3kg之錘沒有產生雜音情形、以5kg之錘產生 雜音情形。 X:以3kg之錘產生雜音情形。 (11)表面固有電阻（Ω/匚）） e 測定薄膜試樣之塗佈層表面的表面固有電阻。使用武 田理硏公司製•固有電阻測定器，以測定溫度23 °C、測定 濕度60%之條件予以調濕1日後，測定以施加電壓1 〇〇V 保持1分鐘後之表面固有電阻（Ω/匚！）。表中，a + bE係 指 ax 10b。 (12)平均粒徑 使用島津製作所製 CP-50型離心粒徑分析器（ Centrifugal Particle Size Analyzer)進行測定。由以所得 -23- 200948890 的離心沉澱曲線爲基準求取各粒徑之粒子與其存在量的累 積曲線讀取相當於50質量％之粒徑，以該値作爲平均粒徑 (13 ) UV油墨密接性 在沒有塗設試樣薄膜之塗佈層的一面上以黏著劑貼附 厚度250μπι之聚酯薄膜，另外，在塗設有塗佈層之一面上 藉由RI試驗器（明製作所製）印刷紫外線硬化型印刷油 0 墨（東洋油墨製Flash Dry FDO紅ΑΡΝ )。然後，使用中 壓水銀燈UV硬化裝置（80W/cm、一燈式、日本電池製） 進行硬化處理，形成厚度爲3.Ομπι之UV油墨層。在該 UV油墨層上貼附長度爲15 cm之膠帶（18 mm寬、日本製 )，使於其上以2kg之手動式荷重輥施予一定荷重的薄膜 予以固定後，觀察使膠帶之一端朝90°方向進行剝離後之 UV油墨層。使UV油墨之密接性藉由下述基準進行評估 。〇、△具有實用性能。 © 〇：UV油墨層完全沒有剝離情形（UV油墨密接性良 好） △:塗膜與UV油墨層間以部分凝聚破壞狀之剝離情形 (UV油墨密接性稍佳） X:塗膜與UV油墨層間以層狀之剝離情形（UV油墨密 接性不佳） 實施例1 -24- 200948890 使132重量份之對苯二甲酸二甲酯、18重量份之異苯 二甲酸二甲酯（全羧酸成分而言聚酯爲12莫耳％)、96 重量份之乙二醇、3.0重量份之二乙二醇、0.05重量份之 醋酸錳、0.012重量份之醋酸鋰，加入具備精餾塔、餾出 冷凝器之燒瓶中，進行攪拌且在150〜23 5 °C下加熱，進行 使甲醇餾出的酯交換反應。餾出甲醇後，添加0.03重量 份之磷酸三甲酯、〇.〇4重量份之二氧化鍺，使反應物移至 0 反應器中。然後，進行攪拌且慢慢地使反應器內減壓至 0.5mmHg，且昇溫至290 °C，進行聚縮合反應。所得的共 聚合聚酯之二乙二醇成分量爲2.5wt%，鍺元素量爲50ppm ，碟元素量爲5ppm。該共聚合聚酯如表1所示、情性粒 子如表1所示之含有率（以組成物之全部重量爲基準）下 添加，作爲A層所使用的聚酯組成物。 另外，使132重量份之對苯二甲酸二甲酯、9重量份 之異苯二甲酸二甲酯（對全部二羧酸成分而言聚酯爲6莫 ❹ 耳％ ) 、96重量份之乙二醇、3_0重量份之二乙二醇、 0-05重量份之醋酸錳、0.012重量份之醋酸鋰，加入具備 精餾塔、餾出冷凝器之燒瓶中，進行攪拌且在150〜23 5。〇 下加熱，進行使甲醇餾出的酯交換反應。餾出甲醇後，添 加〇.〇3重量份之磷酸三甲酯、0.〇4重量份之二氧化鍺， 使反應物移至反應器中。然後，進行攪拌且慢慢地使反應 器內減壓至0.5mmHg，且昇溫至290°C，進行聚縮合反應 。所得的共聚合聚酯之二乙二醇成分量爲2.5wt%，鍺元 素量爲50ppm’碟元素量爲5ppm。使該共聚合聚酯如表2 -25- 200948890 所示、惰性粒子如表2所示之含有率（以組成物之全部重 量爲基準）下添加，作爲B層所使用的聚酯組成物。 使A層所使用的聚酯組成物供應給加熱爲280°C之押 出機，且使B層所使用的聚酯組成物供應給加熱爲2 80 °C 之押出機，且使A層之聚酯組成物與B層之聚酯組成物使 用層A與層B爲A/B下之2層供應區域裝置予以合流， 保持該積層狀態下，藉由塑模成形成薄片狀。 使所得的薄片狀物以表面溫度爲25t之冷卻桶進行冷 卻硬化，形成未延伸薄膜，使該未延伸薄膜在90°C下朝長 度方向（縱方向）延伸3.0倍，以25 °C之輥群進行冷卻。 然後，使經縱延伸的薄膜之兩端以夾子固定且導入拉幅器 ，在加熱爲12(TC之氣體環境中、朝長度垂直的方向（橫 方向）延伸3.6倍。然後，在拉幅器內、2 00 °C之溫度下進 行熱硬化處理3秒鐘，繼後，朝縱方向進行鬆弛處理 0.5%，朝橫方向進行鬆弛處理2.0%，冷卻至室溫，製得 具有薄膜厚度爲153μιη、A層爲116μιη、B層爲37μηι之 二軸延伸薄膜的反射板用聚酯薄膜。所得的薄膜之評估結 果如表5所示。 表中，PET係指聚對苯二甲酸乙二酯' ΙΡΑ係指異苯 二甲酸、Tg係指共聚合聚合物之玻璃轉移溫度、Tm係指 熔點。 實施例2〜1 0 除A層之聚酯組成物改爲如表1所示之共聚合聚醋及 -26- 200948890 惰性粒子所形成，表1所示之惰性粒子的含有率（以組成 物之全部重量爲基準）之聚酯組成物。而且，除B層之聚 酯組成物改爲如表2所示之共聚合聚酯及惰性粒子所形成 ，表2所示之情性粒子的含有率（以組成物之全部重量爲 基準）之聚酯組成物。 除二軸延伸後之薄膜厚度且A層之厚度及B層之厚度 如表3所示外，與實施例1相同地進行延伸，製得二軸延 伸薄膜。所得的二軸延伸薄膜之評估結果如表5所示。 比較例1〜9 除A層之聚酯組成物改爲如表1所示之共聚合聚酯及 惰性粒子所形成，表1所示之惰性粒子的含有率（以組成 物之全部重量爲基準）之聚酯組成物。而且，除B層之聚 酯組成物改爲如表2所示之共聚合聚酯及惰性粒子所形成 ，表2所示之惰性粒子的含有率（以組成物之全部重量爲 〇 基準）之聚酯組成物。 除二軸延伸後之薄膜厚度且A層之厚度及B層之厚度 如表3所示外，與實施例1相同地進行延伸，製得二軸延 伸薄膜。所得的二軸延伸薄膜之評估結果如表5所示。 實施例11〜2 1 使132重量份之對苯二甲酸二甲酯、18重量份之異苯 二甲酸二甲酯（對全部二羧酸成分而言聚酯爲12莫耳％ ) 、96重量份之乙二醇、3.0重量份之二乙二醇、0.05重量 -27- 200948890 份之醋酸錳、0.012重量份之醋酸鋰，加入具備精餾塔、 餾出冷凝器之燒瓶中，進行攪拌且在150〜235 °C下加熱， 進行使甲醇餾出的酯交換反應。餾出甲醇後，添加〇.〇3 重量份之磷酸三甲酯、0.04重量份之二氧化鍺，使反應物 移至反應器中。然後，進行攪拌且慢慢地使反應器內減壓 至0.5mmHg，且昇溫至290°C，進行聚縮合反應。所得的 共聚合聚酯之二乙二醇成分量爲2.5 wt%，鍺元素量爲 5 Oppm，磷元素量爲5ppm。該共聚合聚酯如表1所示、惰 性粒子如表1所示之含有率（以組成物之全部重量爲基準 )下添加，作爲A層所使用的聚酯組成物。 使132重量份之對苯二甲酸二甲酯、9重量份之異苯 二甲酸二甲酯（對全部二羧酸成分而言聚酯爲6莫耳％ ) 、96重量份之乙二醇、3.0重量份之二乙二醇、〇.〇5重量 份之醋酸錳、0.012重量份之醋酸鋰，加入具備精餾塔、 餾出冷凝器之燒瓶中，進行攪拌且在150〜235 °C下加熱， 進行使甲醇餾出的酯交換反應。餾出甲醇後，添加0.0 3 重量份之磷酸三甲酯、〇.〇4重量份之二氧化鍺，使反應物 移至反應器中。然後，進行攪拌且慢慢地使反應器內減壓 至0.5mmHg，且昇溫至290°C，進行聚縮合反應。所得的 共聚合聚酯之二乙二醇成分量爲 2.5wt%，鍺元素量爲 5 Oppm，憐元素量爲5ppm。該共聚合聚醋如表2所示、惰 性粒子如表2所示之含有率（以組成物之全部重量爲基準 )下添加，作爲B層所使用的聚酯組成物。 使A層所使用的聚酯組成物供應給加熱爲280°C之押 -28- 200948890 出機，且使B層所使用的聚醋組成物供應給加熱爲280°C 之押出機，且使A層之聚醋組成物與B層之聚醋組成物使 用層A與層B爲A/B下之2層供應區域裝置予以合流’ 保持該積層狀態下’藉由塑模成形成薄片狀。 使所得的薄片狀物以表面溫度爲20 °C之冷卻桶進行冷 卻硬化，形成未延伸薄膜’使該未延伸薄膜在95°C下朝長 度方向（縱方向）延伸3.〇倍，以25°c之輥群進行冷卻。 0 於其中藉由輥塗佈器在白色層表面上以表4所示之塗佈液 (固成分濃度爲2重量％)、條件進行均勻地塗設。然後 ，使經縱延伸的薄膜之兩端以夾子固定且導入拉幅器，在 加熱爲120 °C之氣體環境中、朝長度垂直的方向（橫方向 )延伸3.6倍。然後，在拉幅器內、200°C之溫度下進行熱 硬化處理3秒鐘，繼後，朝縱方向進行鬆弛處理〇.5%， 朝橫方向進行鬆弛處理2.0%，冷卻至室溫，製得具有薄 膜厚度及A層之厚度及B層之厚度如表3所記載之二軸延 〇 伸薄膜的反射板用塗佈聚酯薄膜。所得的薄膜在85 °c、30 分鐘之熱收縮率係長度方向〇 · 1 %、寬度方向〇」％。所得 的薄膜之評估結果如表5所示。 而且’於表4中塗液之成分如下所述。 紫外線吸收劑1 : 係由50莫耳％以下述式所示之構造/45莫耳％甲基丙 烯酸甲酯/5莫耳％之2_羥基乙基甲基丙烯酸酯所形成的共 聚物。 -29- 200948890Tm. The unstretched sheets extruded from the mold are cooled and solidified in a casting bucket to form an unstretched film. The unstretched film is heated by roll heating, infrared heating or the like, and is extended in the longitudinal direction to obtain a longitudinally stretched film. This extension is preferably carried out by using a peripheral speed difference of two or more rolls. The elongation temperature is preferably a temperature higher than Tg, and more preferably a temperature in the range of Tg 〜(Tg + 7 〇 ) °C. The stretching ratio depends on the required characteristics of the application, but the longitudinal direction and the direction perpendicular to the longitudinal direction (hereinafter referred to as the lateral direction) are preferably 2 to 4.0 times, more preferably 2.3 to 3.9 times. When it is less than 2.2 times, the thickness of the film is deteriorated, and a good film cannot be obtained. When the film thickness is more than 4 〇, the crack is likely to occur in the film formation, which is not desirable. The film e. after the longitudinal stretching is continuously subjected to lateral stretching, heat setting, and thermal relaxation treatment to form a biaxial alignment film, but the treatment is such that the film is walked and carried out. Cross-section -16- 200948890 Stretching treatment begins at a higher temperature than the Tg of the polyester. Then, the temperature is raised and raised at any temperature in the range of (Tg + 5 ) to (Tg + 70 ) °C. During the horizontal extension process, the temperature can be continuously increased, or the temperature can be increased in a stepwise (sequential) manner, but usually the temperature is successively increased. For example, by dividing the laterally extending region of the tenter into a plurality of zones along the traveling direction of the film, a heating medium of a predetermined temperature is passed through each zone to raise the temperature. The magnification of the lateral extension can also be determined depending on the required characteristics of the application, preferably 2.5 to 4.5 times, and more preferably 2.8 to 3.9 times. When it is less than 2.5 times, the thickness of the film is deteriorated, and a good film cannot be obtained. When it is more than 4.5 times, cracking easily occurs in film formation. The film after the transverse stretching can be heat-treated at a width of (Tm - 20 ) ° C ~ (Tm - 100 ° ° C) at a fixed width or a width of 10% or less to reduce heat shrinkage at both ends. rate. Therefore, in the case where the flatness of the film is deteriorated at a high temperature and the thickness of the film is large, it is not desirable. Further, when the heat treatment temperature is lower than (Tm - 100) °C, the heat shrinkage rate becomes large, so it is not desirable. Further, in the process of returning the film temperature to room temperature after heat setting, in order to adjust the amount of heat shrinkage, both ends of the fixed film can be cut, and the drawing speed in the longitudinal direction of the film can be adjusted to relax in the longitudinal direction. The method of slack is to adjust the speed of the roller group on the exit side of the tenter. The ratio of slack is reduced to the speed of the roll of the tenter, preferably from 0.1 to 1.5%, more preferably from 0.2 to 1.2%, and most preferably from 0.3 to 1.0%. The treatment is lowered to relax the film and adjust the heat shrinkage in the longitudinal direction. Moreover, the transverse direction of the film can also be reduced in the process of cutting the ends, and the desired heat shrinkage rate is -17-200948890. Here, when the film is stretched by the sequential biaxial stretching method, it will be described in detail by way of example, but it may be extended by either the sequential biaxial stretching method or the simultaneous biaxial stretching method. The obtained polyester film for a reflecting plate according to the second and third aspects of the present invention is composed of two layers of a support layer and a white reflecting layer provided on one surface thereof, and good flatness can be obtained. Next, an example of a method for producing a coated polyester film for a reflector according to the second and third inventions of the present invention will be described. The coating liquid used in the formation of the coating layer is preferably used in the form of an aqueous coating liquid (e.g., an aqueous solution, an aqueous dispersion, or an emulsion). The solid content concentration of the aqueous coating liquid is usually 20% by weight or less, preferably 1 to 10% by weight. When the amount is less than 1% by weight, the coating property to the polyester film is insufficient, so that it is not desirable. When the amount is more than 20% by weight, the stability of the coating liquid or the appearance of the coating layer is deteriorated, which is not desirable. The application of the aqueous coating liquid to the polyester film can be carried out at any stage, but it is preferably carried out in the production process of the polyester film, and is preferably applied to the polyester film before the completion of the alignment crystallization. Here, the polyester before the completion of the crystallization is included in the one-axis alignment film in which the unstretched film or the unstretched film is aligned in either the longitudinal direction or the transverse direction, and is subjected to a low magnification in both the longitudinal direction and the transverse direction. Extending the aligner (finally extending in the longitudinal or transverse direction to complete the biaxially stretched film before the alignment crystallization). Among them, the uncoated film or the one-axis stretched film which is oriented toward one side is preferably coated with the aqueous coating liquid of the above composition, and is preferably subjected to longitudinal stretching and/or lateral stretching and heat setting treatment. -18- 200948890 When the aqueous coating liquid is applied to a film, physical treatment such as corona discharge surface treatment, flame treatment, plasma treatment, or no preparation is performed on the surface of the film in order to improve the applicability. At the time of the treatment, it is preferred to mix a surfactant which is chemically inert with the composition of the coating layer in the coating liquid. As the coating method, any conventional coating method can be used. For example, a roll coating method, a gravure coating method, a roll brush method, a spray coating method, an air knife coating method, an impregnation method, and a curtain coating method. These can be used singly or in combination. By using the coated polyester film for a reflecting plate of the present invention, the reflectance of at least one surface can be 90% or more at a wavelength of 400 to 700 nm, and preferably 92% or more. The best is more than 94%. When the reflectance in this range is used, when a reflector as a background light unit of a liquid crystal display device is used, high luminance can be obtained. [Embodiment] Hereinafter, the present invention will be described in detail by way of examples. Moreover, the measurement and evaluation are carried out in the following manner. (1) Film thickness The film sample was measured by an electronic micro-tester (K-402B manufactured by Anritsu) at a thickness of 10 points, and the average 値 was used as the thickness of the film. (2) The thickness of each layer was cut into triangles and fixed. After embedding the capsule, it is embedded in epoxy resin. Then, the embedded film sample was subjected to thin film slicing in the longitudinal direction by a micro-slice device (?19-200948890 UL-TRACUT-S), and then observed by an optical microscope, and the thickness ratio of each layer was measured from the photograph. 'The thickness of each layer was calculated from the thickness of the entire film sample. (3) Reflectance (3 -1 ) reflectance (%) An integrating sphere is placed on a spectrophotometer (UV-3101PC manufactured by Shimadzu Corporation). When the BaS04 whiteboard is 100%, the reflectance of the film is 400 to 700 nm. The reflectance was measured from the obtained graph at intervals of 2 nm. Further, a film composed of two layers of the A layer (white reflective layer) / the B layer (support layer) was measured with the A layer (white reflective layer) as a reflecting surface. (3-2) UV reflectance (%) The integrating sphere is set on a spectrophotometer (UV-3 101PC manufactured by Shimadzu Corporation), and when the BaS〇4 whiteboard is 1〇0%, the reflectance (%) of the film is at the wavelength. Measured at 365 nm. Further, the film 'constructed in two layers of the A layer (white reflective layer) / b layer (support layer) was measured by using the A layer (white reflective layer) as a reflecting surface. (4) Elongation The film was stretched by 2.5 to 3.4 times in the longitudinal direction and 3.5 to 37 times in the transverse direction to form a film, and it was observed whether or not the film was formed stably, and the evaluation was carried out based on the following criteria. 〇: It can be stably formed for 1 hour or more -20- 200948890 X: It can be formed without cutting for 1 hour, and it is impossible to form a film stably (5) Glass transition point (Tg), melting point (Tm) The calorimeter (ΤΑ Instruments 2100 DSC) was measured at a temperature increase rate of 20 m/min. (6) Assembly of the film sample to the backlight unit Q. The original light-reflecting sheet assembly is assembled by the liquid crystal TV (AQUOS-2〇V manufactured by SHARP) under the background light (20吋) unit. The film sample of the object was measured. Further, a film composed of two layers of the A layer (white reflective layer) / the B layer (support layer) is assembled with the a layer (white reflective layer) as a reflecting surface. (7) Brightness in the reflection plate The light-emitting surface of the backlight unit was divided into four areas of 2x2, and the front brightness after one hour of lighting was measured using BM-7 manufactured by TOPCON. The measurement angle is Γ, and the distance between the luminance meter and the backlight unit light-emitting surface is 5 〇cm. The simple average 4 of the four brightnesses in the plane of the backlight unit light-emitting surface is obtained as the brightness. (8) Warpage of film The film was cut into a rectangular shape having a length of 200 mm in the film forming direction and cut into a length of 5 mm in the width direction, and used as a film sample for measurement of warpage. Further, a direction perpendicular to the film forming direction of the film is referred to as a width direction. Thin -21 - 200948890 The film sample is placed vertically, and the shorter side of the film sample (hereinafter referred to as the upper end short side) is fixed, and the film sample is suspended. This fixing was carried out by fixing the fixing portion to a clip having a width of 50 mm and a depth of 5 mm, and fixing the upper short side with a width of 50 mm and a depth of 5 mm. At this time, the other short side of the sample (hereinafter referred to as the lower end short side) is disposed below the short side of the upper end. The film sample was subjected to heat treatment in this state. This heat treatment was carried out by holding the film sample in an oven at 85 ° C for 30 minutes in a state of no tension, and then taking it out of the oven and cooling it in an environment of 25 ° C for 10 minutes. By this heat treatment @, the film sample is warped, and the short side of the lower end is moved from the original position. The degree of warpage was measured by measuring the distance from the upper side of the upper short side to the short side of the lower end. This distance is shown in the "warping" column of the table. (9) Flatness of film The self-evaluation liquid crystal television (AQUOS-65V manufactured by SHARP Co., Ltd.) was used as a background light (65 Å) unit, and the originally assembled light-reflecting film was taken out, and a film sample to be measured was assembled. At this time, the layer A (white reflection layer) is used as a reflection surface. After the power is turned on and left for 24 hours, the sample for evaluation is taken out, and the evaluation sample is distributed on a flat plate having a high plane precision and an air removal hole, so that the air on the film and the flat plate is naturally left for more than 3 minutes. After the reduction, the length of the film forming direction of the floating portion of each of the produced films was measured to be the maximum 値, and the total enthalpy was determined. (10) murmur-22- 200948890 In the environment where the background light level is below 2 〇 dB, 'acrylic plate (ACRYLITE® L N865) is superimposed on the film sample, and the negative hammer is loaded on it to make the film at a certain speed (10 cm). / min) Stretching 'The abnormal sound produced at this time from the hammer' is collected by a microphone with a distance of 30 cm. When a noise of more than 40 dB is generated, it is called a noise, and when it produces a noise of less than 4 OdB, it is called no noise. Further, a film composed of two layers of the A layer (white reflective layer) / the B layer (support layer) was stacked on the A layer (white reflective layer) side. 〇 and △ have practical properties. 〇: The hammer of 3kg did not produce noise, and the hammer of 5kg did not produce noise. △: A case where no noise was generated by a hammer of 3 kg, and a noise of 5 kg was generated. X: A noise is generated by a hammer of 3 kg. (11) Surface specific resistance (Ω/匚)) e The surface specific resistance of the surface of the coating layer of the film sample was measured. After the humidity was measured for 23 days under the conditions of a temperature of 23 ° C and a humidity of 60%, the surface specific resistance (Ω / after holding the applied voltage of 1 〇〇 V for 1 minute) was measured using a natural resistance measuring device manufactured by Takeda Ryoko Co., Ltd. Hey!). In the table, a + bE means ax 10b. (12) Average particle diameter The measurement was carried out using a Centrifugal Particle Size Analyzer (Model CP-50) manufactured by Shimadzu Corporation. From the centrifugal sedimentation curve of the obtained -23-200948890, the cumulative curve of the particles of each particle diameter and the amount thereof is obtained, and the particle diameter corresponding to 50% by mass is read, and the ruthenium is used as the average particle diameter (13). A polyester film having a thickness of 250 μm is attached to one side of the coating layer on which the sample film is not applied, and a surface of one of the coating layers is printed by a RI tester (manufactured by Mingsho Co., Ltd.). UV-curable printing oil 0 ink (Toyo Ink made by Flash Dry FDO red ΑΡΝ). Then, it was subjected to a hardening treatment using a medium pressure mercury lamp UV curing device (80 W/cm, one lamp type, manufactured by Nippon Battery Co., Ltd.) to form a UV ink layer having a thickness of 3. Ομπι. A tape of 15 cm in length (18 mm wide, made in Japan) was attached to the UV ink layer, and a film having a load of 2 kg on a manual load roller was fixed thereon, and one end of the tape was observed. The UV ink layer after peeling in the 90° direction. The adhesion of the UV ink was evaluated by the following criteria. 〇 and △ have practical properties. © 〇: The UV ink layer is not peeled at all (the UV ink adhesion is good) △: The peeling of the coating film and the UV ink layer in a partially agglomerated state (the UV ink adhesion is slightly better) X: between the coating film and the UV ink layer Layered peeling condition (poor ink adhesion) Example 1 -24- 200948890 132 parts by weight of dimethyl terephthalate and 18 parts by weight of dimethyl isophthalate (all carboxylic acid component) Polyester (12 mol%), 96 parts by weight of ethylene glycol, 3.0 parts by weight of diethylene glycol, 0.05 parts by weight of manganese acetate, 0.012 parts by weight of lithium acetate, added to a rectification column, distillate condensation The flask was stirred and heated at 150 to 23 ° C to carry out a transesterification reaction in which methanol was distilled off. After distilling off the methanol, 0.03 part by weight of trimethyl phosphate and 4 parts by weight of cerium oxide were added, and the reactant was transferred to a reactor of 0. Then, stirring was carried out, and the inside of the reactor was gradually reduced to 0.5 mmHg, and the temperature was raised to 290 °C to carry out a polycondensation reaction. The amount of the diethylene glycol component of the obtained copolymerized polyester was 2.5% by weight, the amount of the lanthanum element was 50 ppm, and the amount of the dish element was 5 ppm. The copolymerized polyester was added as shown in Table 1, and the content of the particles as shown in Table 1 (based on the total weight of the composition) was added as a polyester composition used for the layer A. Further, 132 parts by weight of dimethyl terephthalate, 9 parts by weight of dimethyl isophthalate (6 mol% of polyester for all dicarboxylic acid components), and 96 parts by weight of B a diol, 3 to 0 parts by weight of diethylene glycol, 0 to 5 parts by weight of manganese acetate, and 0.012 parts by weight of lithium acetate, and added to a flask equipped with a rectification column and a distillation condenser, and stirred at 150 to 23 5 . The mixture was heated under heating to carry out a transesterification reaction for distilling off methanol. After distilling off methanol, 3 parts by weight of trimethyl phosphate and 0.4 parts by weight of cerium oxide were added to transfer the reactants to the reactor. Then, the mixture was stirred and slowly depressurized to 0.5 mmHg in the reactor, and the temperature was raised to 290 °C to carry out a polycondensation reaction. The amount of the diethylene glycol component of the obtained copolymerized polyester was 2.5% by weight, and the amount of the elemental element was 50 ppm. The amount of the dish element was 5 ppm. The copolymerized polyester was added as shown in Table 2 - 25 to 200948890, and the inert particles were added as shown in Table 2 (based on the total weight of the composition) to obtain a polyester composition used as the layer B. The polyester composition used in the layer A was supplied to an extruder heated at 280 ° C, and the polyester composition used in the layer B was supplied to an extruder heated at 2 80 ° C, and the layer A was aggregated. The ester composition and the polyester composition of the layer B are joined by a layer 2 and a layer B in a layer 2 supply region device under A/B, and are formed into a sheet shape by molding while maintaining the layered state. The obtained sheet was cooled and hardened in a cooling bucket having a surface temperature of 25 t to form an unstretched film, and the unstretched film was stretched 3.0 times in the longitudinal direction (longitudinal direction) at 90 ° C to a roll of 25 ° C. The group is cooled. Then, both ends of the longitudinally stretched film are fixed by clips and introduced into the tenter, and are extended by 3.6 times in a direction of vertical (horizontal direction) in a gas atmosphere of 12 (TC). Then, in a tenter The inside was heat-hardened at a temperature of 200 ° C for 3 seconds, and then subjected to a relaxation treatment of 0.5% in the longitudinal direction, a relaxation treatment of 2.0% in the transverse direction, and cooling to room temperature to obtain a film thickness of 153 μm. A polyester film for a reflecting plate having a layer A of 116 μm and a layer B of 37 μm. The evaluation results of the obtained film are shown in Table 5. In the table, PET means polyethylene terephthalate. ΙΡΑ refers to isophthalic acid, Tg refers to the glass transition temperature of the copolymerized polymer, and Tm refers to the melting point. Examples 2 to 1 0 The polyester composition except the A layer is changed to the copolymerization polymerization as shown in Table 1. Vinegar and -26- 200948890 The polyester composition formed by inert particles, the content of inert particles shown in Table 1 (based on the total weight of the composition). Moreover, the polyester composition except the B layer is changed to Formed by the copolymerized polyester and inert particles shown in Table 2, The polyester composition of the content of the emotional particles (based on the total weight of the composition) shown in Fig. 2. The thickness of the film after the biaxial stretching and the thickness of the layer A and the thickness of the layer B are as shown in Table 3. The biaxially stretched film was obtained in the same manner as in Example 1. The evaluation results of the obtained biaxially stretched film are shown in Table 5. Comparative Examples 1 to 9 The polyester composition except the A layer was changed as shown in Table 1. The polyester composition and the inert particles are shown, and the content of the inert particles shown in Table 1 (based on the total weight of the composition) of the polyester composition. Moreover, the polyester composition except the B layer is modified. The polyester composition of the content of inert particles (based on the total weight of the composition) shown in Table 2, which is formed by copolymerizing polyester and inert particles as shown in Table 2. Except for the biaxial stretching The thickness of the film and the thickness of the layer A and the thickness of the layer B were as shown in Table 3, and the film was stretched in the same manner as in Example 1 to obtain a biaxially stretched film. The evaluation results of the obtained biaxially stretched film are shown in Table 5. Example 11 to 2 1 132 parts by weight of dimethyl terephthalate, 18 parts by weight Part of dimethyl isophthalate (12 mol% of polyester for all dicarboxylic acid components), 96 parts by weight of ethylene glycol, 3.0 parts by weight of diethylene glycol, 0.05 weight -27-200948890 A portion of the manganese acetate and 0.012 parts by weight of lithium acetate were placed in a flask equipped with a rectification column and a distillation condenser, stirred, and heated at 150 to 235 ° C to carry out a transesterification reaction in which methanol was distilled off. After methanol, 3 parts by weight of trimethyl phosphate and 0.04 parts by weight of cerium oxide were added to transfer the reactants to the reactor. Then, stirring was carried out and the pressure inside the reactor was slowly reduced to 0.5 mmHg. The temperature was raised to 290 ° C to carry out a polycondensation reaction. The amount of the diethylene glycol component of the obtained copolymerized polyester was 2.5 wt%, the amount of the lanthanum element was 5 Oppm, and the amount of the phosphorus element was 5 ppm. The copolymerized polyester was added as shown in Table 1 and the inert particles were added as shown in Table 1 (based on the total weight of the composition) to obtain a polyester composition used as the layer A. 132 parts by weight of dimethyl terephthalate, 9 parts by weight of dimethyl isophthalate (6 mol% of polyester for all dicarboxylic acid components), 96 parts by weight of ethylene glycol, 3.0 parts by weight of diethylene glycol, ruthenium, 5 parts by weight of manganese acetate, and 0.012 parts by weight of lithium acetate, added to a flask equipped with a rectification column and a distillation condenser, and stirred at 150 to 235 ° C Heating is carried out to carry out a transesterification reaction for distilling off methanol. After distilling off the methanol, 0.03 part by weight of trimethyl phosphate and 4 parts by weight of cerium oxide were added to transfer the reactant to the reactor. Then, stirring was carried out, and the inside of the reactor was gradually reduced to 0.5 mmHg, and the temperature was raised to 290 °C to carry out a polycondensation reaction. The obtained copolymerized polyester had a diethylene glycol component content of 2.5 wt%, a rhodium element amount of 5 Oppm, and a pity element amount of 5 ppm. The copolymerized polyester was added as shown in Table 2, and the inert particles were added as shown in Table 2 (based on the total weight of the composition) to obtain a polyester composition used as the layer B. The polyester composition used in the layer A was supplied to the 280-200948890 heated at 280 ° C, and the polyester composition used in the layer B was supplied to an extruder heated at 280 ° C, and The polyacetic acid composition of the A layer and the polyacetic acid composition of the B layer are joined by the layer 2 and the layer B as the two-layer supply area device under the A/B 'maintaining the laminated state' to form a sheet by molding. The obtained sheet was cooled and hardened in a cooling barrel having a surface temperature of 20 ° C to form an unstretched film 'extending the unstretched film at a temperature of 95 ° C in the longitudinal direction (longitudinal direction) by a factor of 3. The roller group of °c is cooled. 0 was uniformly coated on the surface of the white layer by a roll coater under the conditions of a coating liquid (solid content concentration: 2% by weight) shown in Table 4. Then, both ends of the longitudinally stretched film were fixed by a clip and introduced into a tenter, and extended 3.6 times in the vertical direction (lateral direction) in a gas atmosphere heated at 120 °C. Then, the film was thermally hardened in a tenter at a temperature of 200 ° C for 3 seconds, and then subjected to a relaxation treatment of 5% in the longitudinal direction, a relaxation treatment of 2.0% in the transverse direction, and cooling to room temperature. A coated polyester film for a reflecting plate having a film thickness and a thickness of the A layer and a thickness of the B layer as shown in Table 3 was used. The heat shrinkage rate of the obtained film at 85 ° C for 30 minutes was 1 1 % in the longitudinal direction and 〇 % in the width direction. The evaluation results of the obtained film are shown in Table 5. Further, the components of the coating liquid in Table 4 are as follows. Ultraviolet absorber 1 : A copolymer formed of 50 mol% of a structure represented by the following formula / 45 mol% of methyl methacrylate / 5 mol % of 2-hydroxyethyl methacrylate. -29- 200948890
該紫外線吸收劑1，係爲在側鏈上具有苯并三唑基之 甲基丙烯酸酯樹脂。The ultraviolet absorber 1 is a methacrylate resin having a benzotriazole group in a side chain.
抗靜電劑1: 係由80莫耳％之下述式所示構造/10莫耳％之甲基丙Antistatic agent 1: is composed of 80 mol% of the following formula: /10 mol% of methyl propyl
烯酸酯/10莫耳％之N-羥甲基丙烯醯胺所形成的共聚物。 —CHR1一CR2— CONHR3 (其中，R^R2係各爲H，R3係爲碳數爲3之亞烷 基，R4、R5係各碳數爲1之飽和烴基’ r6係碳數爲2之 羥基亞烷基，γ_係爲甲基磺酸酯離子） 抗靜電劑2: 係由80莫耳％之二甲基胺基乙基磺酸酯甲基丙烯酸酯 /10莫耳％之甲基丙烯酸酯/10莫耳％之Ν-經甲基丙嫌酿胺 所形成的共聚物° 聚矽氧化合物1 : 羧基改性聚矽氧（信越化學工業股份有限公司製商 -30- 200948890 品名 X22-3 70 1 E ) 聚矽氧化合物2 : 環氧基改性聚敬氧（信越化學工業股份有限公司製 商品名KF-101 ) 聚矽氧化合物3 : Φ 胺基改性聚矽氧（信越化學工業股份有限公司製商 品名 KF-8012) 聚矽氧化合物4 : 親水性特殊改性聚矽氧（信越化學工業股份有限公司 製商品名X22-904) 而且，有關聚矽氧化合物1〜4，預先與界面活性劑混 合後，添加於塗佈液中。 ❹ 界面活性劑： 聚氧化乙烯（η = 8·5 )月桂醚（三洋化成股份有限公 司製商品名耐龍亞仓迪（譯音）Ν-85) 交聯劑： 噁唑啉（日本觸媒（股）製商品名EPOCROS® WS- -31 - 700 ) 200948890 〔表1〕 A層薄膜 共聚合聚對男 良二甲酸乙二酯 惰 :性粒子 主成分 共聚合成分 共聚合比例 (mol%) Tg (°C) Tm (°C) mm 含有率 (重量％)/平 均粒徑(μιη) 實施例1 PET IPA 12 74 225 硫酸鋇 45/1.2 實施例2 PET IPA 6 76 242 硫酸鋇 45/1.2 實施例3 PET IPA 10 75 231 硫酸鎖 45/1.2 實施例4 PET IPA 10 75 231 硫酸鋇 45/1.2 實施例5 PET IPA 10 75 231 硫酸鋇 45/1.2 實施例6 PET IPA 9 75 233 硫酸鋇 55/0.5 實施例7 PET IPA 18 72 209 硫酸鋇 35/1.0 實施例8 PET IPA 12 74 225 硫酸鋇 45/1.2 實施例9 PET IPA 12 74 225 硫酸鋇 35/1.0 實施例10 PET IPA 12 74 225 硫酸鋇 45/1.2 實施例11 PET IPA 12 74 225 硫酸鋇 45/1.2 實施例12 PET IPA 12 74 225 硫酸鋇 45/1.2 實施例13 PET IPA 12 74 225 硫酸鋇 45/1.2 實施例14 PET IPA 12 74 225 硫酸鋇 45/1.2 實施例15 PET IPA 12 74 225 硫酸鋇 45/1.2 實施例16 PET IPA 10 75 231 硫酸鋇 45/1.2 實施例17 PET IPA 10 75 231 硫酸鋇 45/1.2 實施例18 PET IPA 10 75 231 硫酸鋇 45/1.2 實施例19 PET IPA 10 75 231 硫酸鋇 45/1.2 實施例20 PET IPA 10 75 231 硫酸鎖 45/1.2 實施例21 PET IPA 10 75 231 硫酸鋇 45/1.2 比較例1 PET IPA 12 74 225 硫酸鋇 45/1.2 比較例2 PET IPA 12 74 225 硫酸鋇 45/1.2 比較例3 PET IPA 6 76 242 硫酸鋇 45/1.2 比較例4 PET IPA 5 76 239 硫酸鋇 45/1.2 比較例5 PET IPA 20 71 203 硫酸鋇 35/1.2 比較例6 PET IPA 10 75 231 硫酸鋇 35/1.2 比較例7 PET IPA 10 75 231 硫酸鎖 35/1.2 比較例8 PET IPA 12 74 225 硫酸鋇 45/1.2 比較例9 PET IPA 14 73 220 硫酸鎖 45/1.2 -32- 200948890 〔表2〕 B層薄膜 共聚合聚對苯二甲酸乙二 m 惰性粒子 主成分 共聚合成分 共聚合比例 Tg Tm 種類 含有率 (mol%) (°C) rc) (軍暈％)/平 均粒徑(μιη) 實施例1 PET IPA 6 76 242 硫酸鋇 5/1.2 實施例2 PET IPA 3 77 250 硫酸鋇 5/1.2 實施例3 PET IPA 6 76 242 硫酸鋇 5/1.2 實施卵 PET IPA 4 77 247 硫酸鋇 5/1.2 實施例5 PET IPA 6 76 242 硫酸鋇 5/1.2 實施例6 PET IPA 3 77 250 硫酸鋇 5/1.2 實施例7 PET IPA 6 76 242 硫酸鋇 3/1.0 實施例8 PET IPA 8 75 236 硫酸鋇 5/1.2 實施例9 PET IPA 6 76 242 硫酸鋇 3/1.0 實施例10 PET IPA 6 76 242 硫酸鋇 5/1.2 實施例11 PET IPA 6 76 242 硫酸鋇 5/1.2 實施例12 PET IPA 6 76 242 硫酸鋇 5/1.2 實施例13 PET IPA 6 76 242 硫酸鋇 5/1.2 實施例14 PET IPA 6 76 242 硫酸鋇 5/1.2 實施例15 PET IPA 6 76 242 硫酸鋇 5/1.2 實施例16 PET IPA 6 76 242 硫酸鋇 5/1.2 實施例17 PET IPA 6 76 242 硫酸鋇 5/1.2 實施例18 PET IPA 6 76 242 硫酸鋇 5/1.2 實施例19 PET IPA 6 76 242 硫酸鋇 5/1.2 實施例20 PET IPA 6 76 242 硫酸鋇 5/1.2 實施例21 PET IPA 6 76 242 硫酸鎖 5/1.2 比較例1 PET IPA 12 74 225 硫酸鋇 5/1.2 比較例2 PET IPA 2 78 253 硫酸鋇 5/1.2 比較卵 PET IPA 10 75 231 硫酸鋇 5/1.2 比較例4 PET IPA 5 76 239 硫酸鋇 5/1.2 比較例5 PET IPA 20 71 203 硫酸鋇 5/1.2 比較例6 PET IPA 8 75 236 硫酸鋇 5/1.2 比較例7 PET IPA 12 74 225 硫酸鋇 5/1.2 比較例8 PET IPA 12 74 225 硫酸鋇 5/1.2 比較例9 PET IPA 12 74 225 硫酸鋇 5/1.2 -33- 200948890 〔表3〕a copolymer of an enoate/10 mole % of N-methylol acrylamide. —CHR1—CR2—CONHR3 (wherein R^R2 are each H, R3 is an alkylene group having 3 carbon atoms, R4 and R5 are saturated hydrocarbon groups each having 1 carbon number' r6 is a hydroxyl group having 2 carbon atoms Alkylene group, γ_ is a mesylate ion) Antistatic agent 2: 80% by mole of dimethylaminoethyl sulfonate methacrylate/10 mole% methacrylic acid Ester / 10 mol% of Ν - copolymer formed by methyl propylene saponin ° poly oxime 1 : carboxy modified poly oxime (Shin-Etsu Chemical Co., Ltd. manufacturer -30- 200948890 product name X22- 3 70 1 E ) Polyoxymethylene compound 2 : Epoxy modified polyoxo (trade name KF-101, manufactured by Shin-Etsu Chemical Co., Ltd.) Polyoxonium 3 : Φ Amine-modified polyfluorene (Shin-Etsu Chemical) Industrial Co., Ltd., trade name KF-8012) Polyoxonium compound 4: Hydrophilic special modified polyfluorene oxide (trade name X22-904, manufactured by Shin-Etsu Chemical Co., Ltd.) Moreover, regarding polyoxonium compounds 1 to 4, After being mixed with the surfactant in advance, it is added to the coating liquid.界面 Surfactant: Polyethylene oxide (η = 8·5 ) Lauryl ether (trade name of Sanyo Chemical Co., Ltd., Nairong Yacangdi (transliteration) Ν-85) Crosslinking agent: Oxazoline (Japanese catalyst ( Co., Ltd. Product name: EPOCROS® WS- -31 - 700 ) 200948890 [Table 1] A-layer film copolymerization poly(ethylene terephthalate) inert: main component of the main component copolymerization component copolymerization ratio (mol%) Tg ( °C) Tm (°C) mm Content (% by weight) / average particle size (μιη) Example 1 PET IPA 12 74 225 Barium sulfate 45/1.2 Example 2 PET IPA 6 76 242 Barium sulfate 45/1.2 Example 3 PET IPA 10 75 231 Sulfuric acid lock 45/1.2 Example 4 PET IPA 10 75 231 Barium sulfate 45/1.2 Example 5 PET IPA 10 75 231 Barium sulfate 45/1.2 Example 6 PET IPA 9 75 233 Barium sulfate 55/0.5 Example 7 PET IPA 18 72 209 Barium Sulfate 35/1.0 Example 8 PET IPA 12 74 225 Barium Sulfate 45/1.2 Example 9 PET IPA 12 74 225 Barium Sulfate 35/1.0 Example 10 PET IPA 12 74 225 Barium Sulfate 45 /1.2 Example 11 PET IPA 12 74 225 Barium Sulfate 45/1.2 Example 12 PET IPA 12 74 225 Barium Sulfate 45/1.2 Real Example 13 PET IPA 12 74 225 Barium Sulfate 45/1.2 Example 14 PET IPA 12 74 225 Barium Sulfate 45/1.2 Example 15 PET IPA 12 74 225 Barium Sulfate 45/1.2 Example 16 PET IPA 10 75 231 Barium Sulfate 45/ 1.2 Example 17 PET IPA 10 75 231 Barium Sulfate 45/1.2 Example 18 PET IPA 10 75 231 Barium Sulfate 45/1.2 Example 19 PET IPA 10 75 231 Barium Sulfate 45/1.2 Example 20 PET IPA 10 75 231 Sulfuric Acid Lock 45/1.2 Example 21 PET IPA 10 75 231 Barium sulfate 45/1.2 Comparative Example 1 PET IPA 12 74 225 Barium sulfate 45/1.2 Comparative Example 2 PET IPA 12 74 225 Barium sulfate 45/1.2 Comparative Example 3 PET IPA 6 76 242 Barium sulfate 45/1.2 Comparative Example 4 PET IPA 5 76 239 Barium sulfate 45/1.2 Comparative Example 5 PET IPA 20 71 203 Barium sulfate 35/1.2 Comparative Example 6 PET IPA 10 75 231 Barium sulfate 35/1.2 Comparative Example 7 PET IPA 10 75 231 Sulfuric Acid Lock 35/1.2 Comparative Example 8 PET IPA 12 74 225 Barium Sulfate 45/1.2 Comparative Example 9 PET IPA 14 73 220 Sulfuric Acid Lock 45/1.2 -32- 200948890 [Table 2] B-layer film copolymerized poly-p-phenylene Formic acid ethylene m m inert particles main component copolymerization component copolymerization ratio Tg Tm type containing (mol%) (°C) rc) (Military%)/Average particle size (μιη) Example 1 PET IPA 6 76 242 Barium sulfate 5/1.2 Example 2 PET IPA 3 77 250 Barium sulfate 5/1.2 Example 3 PET IPA 6 76 242 Barium Sulfate 5/1.2 Implementing Egg PET IPA 4 77 247 Barium Sulfate 5/1.2 Example 5 PET IPA 6 76 242 Barium Sulfate 5/1.2 Example 6 PET IPA 3 77 250 Barium Sulfate 5/1.2 Implementation Example 7 PET IPA 6 76 242 Barium Sulfate 3/1.0 Example 8 PET IPA 8 75 236 Barium Sulfate 5/1.2 Example 9 PET IPA 6 76 242 Barium Sulfate 3/1.0 Example 10 PET IPA 6 76 242 Barium Sulfate 5/ 1.2 Example 11 PET IPA 6 76 242 Barium Sulfate 5/1.2 Example 12 PET IPA 6 76 242 Barium Sulfate 5/1.2 Example 13 PET IPA 6 76 242 Barium Sulfate 5/1.2 Example 14 PET IPA 6 76 242 Barium Sulfate 5/1.2 Example 15 PET IPA 6 76 242 Barium sulfate 5/1.2 Example 16 PET IPA 6 76 242 Barium sulfate 5/1.2 Example 17 PET IPA 6 76 242 Barium sulfate 5/1.2 Example 18 PET IPA 6 76 242 Barium sulfate 5/1.2 Example 19 PET IPA 6 76 242 Barium sulfate 5/1.2 Example 20 PET IPA 6 76 242 Barium sulfate 5/1.2 Example 21 PET IPA 6 76 242 Acid Lock 5/1.2 Comparative Example 1 PET IPA 12 74 225 Barium Sulfate 5/1.2 Comparative Example 2 PET IPA 2 78 253 Barium Sulfate 5/1.2 Comparative Egg PET IPA 10 75 231 Barium Sulfate 5/1.2 Comparative Example 4 PET IPA 5 76 239 Barium Sulfate 5/1.2 Comparative Example 5 PET IPA 20 71 203 Barium Sulfate 5/1.2 Comparative Example 6 PET IPA 8 75 236 Barium Sulfate 5/1.2 Comparative Example 7 PET IPA 12 74 225 Barium Sulfate 5/1.2 Comparative Example 8 PET IPA 12 74 225 Barium sulfate 5/1.2 Comparative Example 9 PET IPA 12 74 225 Barium sulfate 5/1.2 -33- 200948890 [Table 3]
2軸延伸後之厚度 各層之厚度 異苯二甲酸含 層厚比例 延伸性 (μηι) Α層 Β層 有率之比例 (μιη) (Α層/Β層） (Α '層/Β層） 實施例1 153 116 37 2.0 3.1 〇 實施例2 192 157 35 2.0 4.5 〇 實施例3 191 156 35 1.7 4.5 〇 實施例4 189 155 34 2.5 4.5 〇 實施例5 190 155 35 1.7 4.5 〇 實施例ό 195 146 49 3.0 3.0 〇 實施例7 198 158 40 3.0 4.0 〇 實施例8 196 148 48 1.5 3.1 〇 實施例9 289 231 58 2.0 4.0 〇 實施例1〇 72 54 18 2.0 3.1 〇 實施例11 153 116 37 2.0 3.1 〇 實施例12 153 116 37 2.0 3.1 〇 實施例13 153 116 37 2.0 3.1 〇 實施例14 153 116 37 2.0 3.1 〇 實施例15 153 116 37 2.0 3.1 〇 實施例16 191 156 35 1.7 4.5 〇 實施例17 191 156 35 1.7 4.5 〇 實施例18 191 156 35 1.7 4.5 〇 實施例19 191 156 35 1.7 4.5 〇 實施例20 191 156 35 1.7 4.5 〇 實施例21 191 156 35 1.7 4.5 〇 比較例1 150 105 45 1.0 2.3 〇 比較例2 178 125 53 6.0 2.3 Δ 比較例3 198 139 59 0.6 2.3 〇 比較例4 192 134 58 1.0 2.3 X 比較例5 192 145 47 1.0 3.1 Δ 比較例ό 99 79 20 1.3 4.0 X 比較例7 97 49 49 0.8 1.0 〇 比較例8 49 39 10 1.0 4.0 〇 比較例9 450 315 135 1.2 2.3 X -34- 200948890 〔表4〕 塗佈 塗液組成(重量％) 層厚 紫外線 抗靜 抗靜 聚矽氧 聚砍氧 聚砂氧 聚砍氧 界面 度 吸收劑 電劑 電劑 化合物 化合物 化合物 化合物 活性 (μιη) 1 1 2 1 2 3 4 劑 實施例1 0 實施例2 0 實施例3 0 實施例4 0 實施例5 0 實施例6 0 實施例7 0 實施例8 0 實施例9 0 實施例10 0 實施例11 0.1 35 40 15 10 實施例12 0.1 35 40 15 10 實施例13 0.1 35 40 15 10 實施例14 0.1 35 40 15 10 實施例15 0.1 35 40 15 10 實施例16 0.1 25 50 15 10 實施例17 0.1 70 15 5 10 實施例18 0.1 45 25 20 10 實施例19 0.1 15 70 5 10 實施例20 0.1 35 45 10 10 實施例21 0.1 20 30 40 10 比較例1 0 比較例2 0 比較例3 0 比較例4 0 比較例5 0 比較例6 0 比較例7 0 比較例8 0 比較例9 0 -35- 200948890 〔表5〕 反射率 (%) 反射板方 面之亮度 (cd/m2) 翹曲 情形 (mm) 平面性 (mm) 雜音 UV 反射率 (%) 表面固 有電阻 (Ω/口） UV油墨 密接性 實施例1 98.3 5900 1 19 實施例2 98.7 6000 1 19 實施例3 98.7 6000 0 0 實施例4 98.7 6000 4 72 實施例5 98.7 6000 0 0 實施例6 98.6 6000 6 108 實施例7 98.8 6000 6 108 實施例8 98.6 6000 1 11 實施例9 99.2 6100 1 19 實施例10 96.8 5800 1 19 實施例11 98.3 5900 1 19 〇 63.2 1E+10 〇 實施例12 98.3 5900 1 19 〇 64.3 3E+10 〇 實施例13 98.3 5900 1 19 〇 63.7 5E+10 〇 實施例14 98.3 5900 1 19 〇 64.1 9E+09 〇 實施例15 98.3 5900 1 19 〇 65.3 2E+11 〇 實施例16 98.7 6000 0 0 〇 71.8 5E+09 〇 實施例17 98.7 6000 0 0 Δ 49.7 1E+12 〇 實施例18 98.7 6000 0 0 〇 61 8E+10 〇 實施例19 98.7 6000 0 0 Δ 78 2E+09 〇 實施例20 98.7 6000 0 0 Δ 66.2 9E+09 〇 實施例21 98.7 6000 0 0 ◎ 74.9 6E+10 Δ 比較例1 98.2 5901 12 216 比較例2 98.6 6000 100 1800 比較例3 98.8 6000 40 714 比較例4 98.3 6000 12 216 比較例5 96.2 5600 12 216 比較例6 97.4 5800 4 72 比較例7 96.9 5800 21 376 比較例8 96.2 5600 12 216 比較例9 99.5 6100 6 109 -36- 200948890 〔發明效果〕 藉由本發明之第一發明，可提供一種延伸性良好、且 在作爲液晶顯示裝置之背景光單位所使用的反射板於使用 環境中翹曲情形經抑制的平面性優異之反射板用聚酯薄膜 0 藉由本發明之第二發明，可提供一種除上述特性外， 0 具備抗靜電性、與點印刷時使用的油墨之密接性優異’作 爲反射板組裝於背景光單位時，與其他構件不會產生摩擦 聲音，不會使配置於反射板附近之其他構件產生惡化情形 下，紫外線反射經抑制的反射板用塗佈聚酯薄膜。 藉由本發明之第三發明，可提供一種具備抗靜電性、 與點印刷時使用的油墨之密接性優異，作爲反射板組裝於 背景光單位時，與其他構件不會產生摩擦聲音，不會使配 置於反射板附近之其他構件產生惡化情形下，紫外線反射 〇 經抑制的反射板用塗佈聚酯薄膜。 〔產業上之利用價値〕 本發明之反射板用聚酯薄膜及反射板用塗佈聚酯薄膜 ，係可使用白色反射層作爲反射面時作爲反射板使用，特 別是適合作爲液晶顯示裝置之背景光單位的面光源反射板 使用。 -37-Thickness of each layer after 2-axis extension Thickness ratio of polyphthalic acid containing layer thickness (μηι) Ratio of Α layer 有 layer ratio (μιη) (Α layer/Β layer) (Α 'layer/Β layer) Example 1 153 116 37 2.0 3.1 〇 Example 2 192 157 35 2.0 4.5 〇 Example 3 191 156 35 1.7 4.5 〇 Example 4 189 155 34 2.5 4.5 〇 Example 5 190 155 35 1.7 4.5 〇Example ό 195 146 49 3.0 3.0 〇 Example 7 198 158 40 3.0 4.0 〇 Example 8 196 148 48 1.5 3.1 〇 Example 9 289 231 58 2.0 4.0 〇 Example 1 〇 72 54 18 2.0 3.1 〇 Example 11 153 116 37 2.0 3.1 〇 Example 12 153 116 37 2.0 3.1 〇 Example 13 153 116 37 2.0 3.1 〇 Example 14 153 116 37 2.0 3.1 〇 Example 15 153 116 37 2.0 3.1 〇 Example 16 191 156 35 1.7 4.5 〇 Example 17 191 156 35 1.7 4.5 〇 Example 18 191 156 35 1.7 4.5 〇 Example 19 191 156 35 1.7 4.5 〇 Example 20 191 156 35 1.7 4.5 〇 Example 21 191 156 35 1.7 4.5 〇 Comparative Example 1 150 105 45 1.0 2.3 〇 Comparative Example 2 178 125 53 6.0 2.3 Δ Comparative Example 3 19 8 139 59 0.6 2.3 〇Comparative Example 4 192 134 58 1.0 2.3 X Comparative Example 5 192 145 47 1.0 3.1 Δ Comparative Example ό 99 79 20 1.3 4.0 X Comparative Example 7 97 49 49 0.8 1.0 〇Comparative Example 8 49 39 10 1.0 4.0 〇Comparative Example 9 450 315 135 1.2 2.3 X -34- 200948890 [Table 4] Composition of coating liquid (% by weight) Layer thickness UV antistatic static polyoxynized polyoxylized polyoxo oxygenated polyoxygenated interface degree absorbent Electrolyte Electrolyte Compound Compound Compound Activity (μιη) 1 1 2 1 2 3 4 Agent Example 1 0 Example 2 0 Example 3 0 Example 4 0 Example 5 0 Example 6 0 Example 7 0 Example 8 0 Example 9 0 Example 10 0 Example 11 0.1 35 40 15 10 Example 12 0.1 35 40 15 10 Example 13 0.1 35 40 15 10 Example 14 0.1 35 40 15 10 Example 15 0.1 35 40 15 10 Example 16 0.1 25 50 15 10 Example 17 0.1 70 15 5 10 Example 18 0.1 45 25 20 10 Example 19 0.1 15 70 5 10 Example 20 0.1 35 4 5 10 10 Example 21 0.1 20 30 40 10 Comparative Example 1 0 Comparative Example 2 0 Comparative Example 3 0 Comparative Example 4 0 Comparative Example 5 0 Comparative Example 6 0 Comparative Example 7 0 Comparative Example 8 0 Comparative Example 9 0 -35- 200948890 [Table 5] Reflectance (%) Brightness of reflector (cd/m2) Warpage (mm) Planarity (mm) Noise UV reflectance (%) Surface specific resistance (Ω/port) UV ink adhesion Example 1 98.3 5900 1 19 Example 2 98.7 6000 1 19 Example 3 98.7 6000 0 0 Example 4 98.7 6000 4 72 Example 5 98.7 6000 0 0 Example 6 98.6 6000 6 108 Example 7 98.8 6000 6 108 Implementation Example 8 98.6 6000 1 11 Example 9 99.2 6100 1 19 Example 10 96.8 5800 1 19 Example 11 98.3 5900 1 19 〇 63.2 1E+10 〇 Example 12 98.3 5900 1 19 〇 64.3 3E+10 〇 Example 13 98.3 5900 1 19 〇63.7 5E+10 〇Example 14 98.3 5900 1 19 〇64.1 9E+09 〇Example 15 98.3 5900 1 19 〇65.3 2E+11 〇Example 16 98.7 6000 0 0 〇71.8 5 E+09 〇Example 17 98.7 6000 0 0 Δ 49.7 1E+12 〇Example 18 98.7 6000 0 0 〇61 8E+10 〇Example 19 98.7 6000 0 0 Δ 78 2E+09 〇Example 20 98.7 6000 0 0 Δ 66.2 9E+09 〇 Example 21 98.7 6000 0 0 ◎ 74.9 6E+10 Δ Comparative Example 1 98.2 5901 12 216 Comparative Example 2 98.6 6000 100 1800 Comparative Example 3 98.8 6000 40 714 Comparative Example 4 98.3 6000 12 216 Comparative Example 5 96.2 5600 12 216 Comparative Example 6 97.4 5800 4 72 Comparative Example 7 96.9 5800 21 376 Comparative Example 8 96.2 5600 12 216 Comparative Example 9 99.5 6100 6 109 -36- 200948890 [Effect of the Invention] By the first invention of the present invention, it is possible to provide A polyester film for a reflecting sheet which is excellent in stretchability and which is excellent in planarity in which a reflecting plate used as a backlight unit of a liquid crystal display device is warped in a use environment can be obtained by the second invention of the present invention. In addition to the above characteristics, 0 is excellent in antistatic property and excellent in adhesion to ink used for dot printing. When assembled as a reflector in a backlight unit, it does not occur with other members. Rubbing sound, it does not make configured to generate the degraded situation, the reflected UV-reflecting plate coated polyester film was suppressed in the vicinity of the other member of the reflecting plate. According to the third aspect of the present invention, it is possible to provide an antistatic property and excellent adhesion to an ink used for dot printing, and when it is incorporated as a backlight unit as a reflector, it does not cause a rubbing sound with other members, and does not cause The other member disposed in the vicinity of the reflecting plate is coated with a polyester film for a reflecting plate in which the ultraviolet ray reflection is suppressed. [Industrial price] The polyester film for a reflector and the polyester film for a reflector of the present invention can be used as a reflector when a white reflective layer is used as a reflective surface, and is particularly suitable as a background of a liquid crystal display device. The light source reflector of the light unit is used. -37-