[聚酯膜] 構成本發明之積層聚酯膜之聚酯膜可為單層構成，亦可為積層構成。積層構成例如可為2層、3層、4層或其以上之多層，並無特別限定。於本發明之較佳之實施形態中，聚酯膜較佳為至少3層以上之積層構造，更佳為依序積層最表層(表層A)、中間層、最表層(表層B)而成之3層構造。 聚酯膜中使用之聚酯可為均聚酯，亦可為共聚合聚酯。於包含均聚酯之情形時，較佳為使芳香族二羧酸與脂肪族二醇進行縮聚而獲得者。作為芳香族二羧酸，可列舉：對苯二甲酸、2,6-萘二甲酸等，作為脂肪族二醇，可列舉：乙二醇、二乙二醇、1,4-環己烷二甲醇等。作為代表性之聚酯，可例示聚對苯二甲酸乙二酯(PET)等。另一方面，作為共聚合聚酯之二羧酸成分，可列舉：間苯二甲酸、鄰苯二甲酸、對苯二甲酸、2,6-萘二甲酸、己二酸、癸二酸等中之一種或兩種以上，作為二醇成分，可列舉：乙二醇、二乙二醇、丙二醇、丁二醇、1,4-環己烷二甲醇、新戊二醇等中之一種或兩種以上。於任一情形下，作為本發明中所謂之聚酯，較佳為作為通常60莫耳%以上、較佳為80莫耳%以上為對苯二甲酸乙二酯單元之聚對苯二甲酸乙二酯之聚酯。 作為用以滿足本發明之具體之方法之一，較佳為構成最表層之聚酯含有80重量%以上之低聚物(酯環狀三聚物)含量為0.5重量%以下之聚酯。藉此，可獲得所需之低聚物析出防止效果。藉由使用80重量%以上之低聚物含量為0.5重量%以下之聚酯，成為可抑制於經過熱處理步驟後霧度大幅上升，於加工後，就光學特性、例如視認性之方面而言作為光學構件用較佳之聚酯膜。 於本發明中，就降低膜中之低聚物量之方面而言，較佳為於聚酯膜中，通常含有選自由鈦化合物及磷化合物所組成之群中之至少1種化合物。 聚酯膜中之鈦元素含量(Ti量)較佳為20 ppm以下，更佳為2～10 ppm。於上述Ti量超過20 ppm之情形時，有於熔融擠出聚酯之步驟中副產低聚物，無法獲得為低低聚物且具有高透明性之膜之情形。於光學用途中，有難以應對重視色調之用途之情形。 另一方面，聚酯膜中之磷元素含量(P量)較佳為20 ppm以下，更佳為5～15 ppm。於上述P量超過20 ppm之情形時，有於製造聚酯時發生凝膠化，成為異物而降低膜之品質，例如，難以應對伴隨光學評價之檢查步驟之情形。 於本發明中，較佳為同時滿足上述Ti量及上述P量，藉此，可對聚酯膜中之低聚物含量之降低發揮明顯之效果。 聚酯膜中所包含之鈦化合物之種類並無特別限定，更佳為以鈦酸四異丙酯、鈦酸四丁酯為代表之鈦系聚合觸媒。 又，磷化合物之種類亦無特別限定，更佳為酸式磷酸乙酯、酸式磷酸丁酯、酸式磷酸2-乙基己酯等以酸式磷酸烷基酯為代表之磷酸酯。 關於構成聚酯膜之最表層，就容易進行伴隨光學評價之檢查之觀點而言，與防靜電層相接之側之聚酯膜之最表層(表層A)不含有粒子。 藉由於上述表層A不含有粒子，可使聚酯膜之表面充分地平滑化，故而積層於其上之下述防靜電層之厚度變得均一。防靜電層由於包含有色之聚噻吩或聚噻吩衍生物，故而抑制因防靜電層之厚度不均一而產生之積層聚酯膜之外觀之深淺差異。因此，降低因深淺差異所引起之異物誤認。 另一方面，於上述表層A含有粒子之情形時，於聚酯膜與粒子之界面產生孔隙或缺陷，該等成為容易使低聚物移動至聚酯膜之表面之契機，故而有於聚酯膜之表面產生低聚物之虞。因此，藉由於上述表層A不含有粒子，可抑制低聚物之產生。 根據以上之方面，藉由於上述表層A不含有粒子，可獲得檢查性良好之積層聚酯膜。 本發明中所謂之「不含有粒子」係定義為於表層A，例如於為無機粒子之情形時，於利用XRF(X-ray fluorescence，螢光X射線)分析對無機元素進行定量之情形下，成為50 ppm以下、較佳為10 ppm以下、最佳為檢測極限以下之粒子含量。於為有機粒子之情形時，定義為藉由紅外分光法所測得之上述表層A之紅外吸收光譜不出現與聚酯原料不同之峰值。其原因在於即便刻意使上述表層A中不含有粒子，於製造步驟中，亦考慮因自外部之異物混入等所引起之可能性。 又，於另一最表層(即與防靜電層相反之一側之聚酯膜之最表層；表層B)，以易滑性賦予為主要之目的，較佳為調配粒子。調配之粒子之種類只要為可賦予易滑性之粒子則並無特別限定，作為具體例，例如可列舉：二氧化矽、碳酸鈣、碳酸鎂、碳酸鋇、硫酸鈣、磷酸鈣、磷酸鎂、高嶺土、氧化鋁、氧化鈦等粒子。又，亦可使用日本專利特公昭59-5216號公報、日本專利特開昭59-217755號公報等中所記載之耐熱性有機粒子。作為該其他耐熱性有機粒子之例，可列舉：熱硬化性脲樹脂、熱硬化性酚樹脂、熱硬化性環氧樹脂、苯并胍胺樹脂等。進而，於聚酯製造步驟中，亦可使用使觸媒等金屬化合物之一部分沈澱、微分散而成之析出粒子。 關於使用之粒子之形狀，亦無特別限定，可使用球狀、塊狀、棒狀、扁平狀等中之任一種。又，關於其硬度、比重、顏色等，亦無特別限制。該等一連串之粒子可視需要併用2種以上。 就可應對伴隨光學評價之檢查步驟之方面而言，上述表層B中所含有之粒子之平均粒徑(d50)較佳為0.1 μm以上，更佳為0.2 μm以上，而且，較佳為3.0 μm以下，更佳為1.0 μm以下。於平均粒徑未達0.1 μm之情形時，有膜表面過度平坦化，膜卷取性降低之情形。另一方面，於平均粒徑超過3.0 μm之情形時，有因膜中所包含之粒子之存在，於伴隨光學評價之檢查步驟中帶來障礙之情形。 進而，上述表層B中之粒子含量較佳為0.001重量%以上，更佳為0.01重量%以上，而且，較佳為3重量%以下，更佳為2重量%以下。於粒子含量未達0.001重量%之情形時，有膜之易滑性不充分之情形，另一方面，於超過3重量%而添加之情形時，有膜之透明性變得不充分，於伴隨光學評價之檢查步驟中帶來障礙之情形。 作為於上述表層B中添加粒子之方法，並無特別限定，可採用先前公知之方法。例如，可於製造構成各層之聚酯之任意之階段添加，較佳為可於酯化之階段或酯交換反應結束後，進行縮聚反應。 又，藉由如下方法等進行：使用附排氣孔之混練擠出機，將分散於乙二醇或水等中之粒子之漿料與聚酯原料進行混合；或者使用混練擠出機，將乾燥之粒子與聚酯原料進行混合。 再者，於聚酯膜中，除上述粒子以外，亦可視需要添加先前公知之抗氧化劑、防靜電劑、熱穩定劑、潤滑劑、染料、顏料等。 聚酯膜較佳為含有紫外線吸收劑。於聚酯膜為依序積層最表層(表層A)、中間層、最表層(表層B)而成之3層構造之情形時，較佳為中間層含有紫外線吸收劑。藉由聚酯膜含有紫外線吸收劑，於在將表面保護膜貼合於構件之狀態下進行雷射加工(切斷、標記、修整、開孔等)時，能夠進行儘可能不存在來自表面保護膜之異物附著、或構件之毛邊產生之雷射加工。 尤其於雷射光之波長處於紫外線區域(350 nm以下)之情形時，能夠進行有效率地利用隨著紫外線吸收而產生之熱能之雷射加工。又，於雷射照射時，可藉由表面保護膜本身防止對貼合之構件本身施加過量之熱能，故而例如，亦可自因雷射照射所引起之損傷而保護對熱敏感之電子電路等電子零件。 作為使用之紫外線吸收劑，可列舉：有機系紫外線吸收劑及無機系紫外線吸收劑，就透明性、及容易含有於聚酯中之方面而言，較佳為使用有機系紫外線吸收劑。 作為有機系紫外線吸收劑，作為水楊酸系化合物，例如可列舉：水楊酸苯酯、水楊酸對第三丁基苯酯、水楊酸對辛基苯酯等；作為苯并㗁 系化合物，例如可列舉2,2-(1,4-伸苯基)雙[4H-3,1-苯并㗁-4-酮]；作為苯并***系化合物之例，可列舉2,2'-亞甲基雙[6-(苯并***-2-基)-4-第三辛基苯酚]；作為二苯甲酮系化合物，例如可列舉：2-羥基-4-苄氧基二苯甲酮、2,4-二羥基二苯甲酮、2-羥基-4-甲氧基二苯甲酮、2-羥基-辛氧基二苯甲酮、2-羥基-4-十二烷氧基二苯甲酮、2,2'-二羥基-4-甲氧基二苯甲酮、2,2'-二羥基-4,4'-二甲氧基二苯甲酮等；作為苯并***系化合物，例如可列舉：2-(2'-羥基-5'-第三辛基苯基)-苯并***、2-(2'-羥基-5'-第三辛基苯基)-苯并***、2-(2'-羥基-5'-甲基苯基)苯并***、2-(2'-羥基-3',5'-二-第三丁基苯基)苯并***、2-(2'-羥基-3'-第三丁基-5'-甲基苯基)-5-氯苯并***、2-(2'-羥基-3',5'-二-第三丁基苯基)5-氯苯并***等；作為天然物系化合物，例如可列舉：穀維素、乳油木果油、黃苓苷等；作為生物系化合物，例如可列舉：角質細胞、黑色素、尿刊酸等。可將該等有機系紫外線吸收劑使用1種，或者併用2種以上而使用。 於該等中，苯并㗁系化合物及苯并***系化合物就與聚酯膜之相溶性良好，極大吸收為350 nm以下，且於膜中之調配量為相對較少之量，350 nm以下之紫外線區域中之紫外線吸收效率提高之方面而言較佳。 作為將紫外線吸收劑調配於聚酯膜之方法，可列舉：將紫外線吸收劑直接添加至擠出機之方法；將預先混練紫外線吸收劑而成之聚酯樹脂添加至擠出機之方法等，可採用任一方法，亦可併用2種方法。 紫外線吸收劑之含量相對於聚酯膜整體，以總合計量計，較佳為0.5重量%以上，更佳為0.7重量%以上，而且，較佳為3.0重量%以下，更佳為2.5重量%以下。於膜中紫外線吸收劑之含量超過上述上限之情形時，有雷射光吸收性能已成為飽和狀態之情形。另一方面，於紫外線吸收劑之含量低於上述下限之情形時，例如，有隨著雷射光吸收效率降低，雷射照射時間變長，容易產生來自表面保護膜之異物附著等不良情況之情形。 作為紫外線吸收劑，較佳為併用至少2種紫外線吸收劑。例如，於聚酯膜含有2種紫外線吸收劑之情形時，含量較多之紫外線吸收劑與其他紫外線吸收劑之含有比以重量比計較佳為2：1～10：1，更佳為2：1～8：1。於含量最多之紫外線吸收劑之比大於上述上限之情形時，有一紫外線吸收劑之濃度變得過高，缺乏紫外線吸收劑之波長選擇性之情形。 就賦予雷射光吸收功能之觀點而言，本發明中之聚酯膜之波長350 nm以下之光線透過率較佳為10%以下，更佳為7%以下。若波長350 nm以下之光線透過率大於10%，則於用作表面保護膜用基材之情形時，有雷射光吸收效率較差，例如，雷射照射時間變長，容易產生來自表面保護膜之異物之情形。 再者，作為於對被覆有使用本發明之積層聚酯膜之表面保護膜之構件進行加工時使用的雷射，可使用固體雷射、半導體雷射、液體雷射、氣體雷射等先前公知之雷射。其中，較佳為CO2
雷射、YAG(Yttrium Aluminium Garnet，釔鋁石榴石)雷射，就防止因雷射照射所引起之來自表面保護膜之異物產生、或者防止雷射照射後製品中之毛邊產生的觀點而言，更佳為YAG雷射。 聚酯膜之厚度只要為可製成膜之範圍則並無特別限定，用途上，較佳為12 μm以上，更佳為25 μm以上，而且，較佳為250 μm以下，更佳為125 μm以下。 於聚酯膜為依序積層最表層(表層A)、中間層、最表層(表層B)而成之3層構造之情形時，表層A之厚度較佳為1 μm以上，更佳為2 μm以上，進而較佳為3 μm以上，而且，較佳為50 μm以下，更佳為30 μm以下，進而較佳為20 μm以下。藉由上述表層A之厚度為上述範圍，可使聚酯膜之表面充分地平滑化。又，表層B之厚度並無特別限定，較佳為1 μm以上，更佳為2 μm以上，進而較佳為3 μm以上，而且，較佳為50 μm以下，更佳為30 μm以下，進而較佳為20 μm以下。藉由上述表層B之厚度為上述範圍，可具有充分之易滑性。 其次，對構成本發明之積層聚酯膜之聚酯膜之製造例進行具體說明，但不受以下之製造例之任何限定。再者，以下之製造例為雙軸延伸膜之製造例，但本發明中之聚酯膜並不限定於雙軸延伸膜，亦可為單軸延伸膜或無延伸膜。 較佳為如下方法：首先，使用以上所述之聚酯原料，利用冷卻輥將自模具擠出之熔融片材冷卻固化而獲得未延伸片材。於該情形時，為了提昇片材之平面性，需要提高片材與旋轉冷卻滾筒之密接性，較佳為採用靜電施加密接法及/或液體塗佈密接法。其次，將所獲得之未延伸片材於雙軸方向進行延伸。於該情形時，首先將上述未延伸片材藉由輥或拉幅機方式之延伸機向一方向進行延伸。延伸溫度通常為70～120℃，較佳為80～110℃，延伸倍率通常為2.5～7.0倍，較佳為3.0～6.0倍。繼而，與第一階段之延伸方向正交之延伸溫度通常為70～170℃，延伸倍率通常為3.0～7.0倍，較佳為3.5～6.0倍。然後，繼續於180～270℃之溫度下，於拉伸下或30%以內之鬆弛下進行熱處理，而獲得雙軸配向膜。上述延伸亦可採用以2個階段以上進行一方向之延伸之方法。於該情形時，較佳為以最終兩方向之延伸倍率分別成為上述範圍之方式進行。 又，關於聚酯膜製造，亦可採用同時雙軸延伸法。關於同時雙軸延伸裝置，可採用螺旋方式、縮放方式、線性驅動方式等先前公知之延伸方式。 進而，可於上述聚酯膜之延伸步驟中實施對膜表面進行處理之所謂塗佈延伸法(線內塗佈)。於藉由塗佈延伸法於聚酯膜上設置塗佈層(例如防靜電層)之情形時，變得可於延伸之同時進行塗佈，並且可根據延伸倍率而減薄塗佈層之厚度，從而可製造作為聚酯膜而言適宜之膜。 [防靜電層(塗佈層1)] 本發明之積層聚酯膜於上述聚酯膜之至少單面具有防靜電層(塗佈層1)。於聚酯膜為依序積層最表層(表層A)、中間層、最表層(表層B)而成之3層構造之情形時，於上述聚酯膜中之表層A之上具有防靜電層。 關於構成積層聚酯膜之防靜電層，作為表面保護膜之構成構件，為了使防靜電性良好，含有聚噻吩或聚噻吩衍生物作為防靜電劑，較佳為進而含有黏合劑聚合物。藉由使用聚噻吩或聚噻吩衍生物作為防靜電層，可具有更高之導電性。進而，聚酯膜有產生因相位差所引起之虹之類的色不均(虹不均)之情況。於本發明之積層聚酯膜中，藉由使用有色之聚噻吩或聚噻吩衍生物，可抑制虹不均，藉由異物檢查，可抑制因虹不均所引起之誤認。再者，防靜電層中可於無損本發明之主旨之範圍內含有其他成分。 作為聚噻吩衍生物，例如可例示於噻吩環之3位及4位之位置鍵結有官能基之化合物。較佳為於3位及4位之碳原子上鍵結有氧原子之下述式(I)所表示之化合物。 [化1]上述式(I)中，R1
、R2
分別獨立地表示氫元素、碳數1～12之脂肪族鏈狀烴基、脂環式烴基或芳香族烴基，例如為甲基、乙基、丙基、異丙基、丁基、環己基、苯基等。 於積層聚酯膜之防靜電層中，可使用下述式(II)所表示之聚噻吩衍生物作為防靜電劑。例如較佳為下述式(II)中n＝1(亞甲基)、n＝2(伸乙基)、n＝3(伸丙基)之化合物。其中，尤佳為n＝2之伸乙基之化合物、即聚-3,4-乙二氧基噻吩。 [化2]上述式(II)中，n為1～4之整數。 進而較佳為防靜電層中含有包含上述聚噻吩及聚陰離子之組合物、或包含上述聚噻吩衍生物及聚陰離子之組合物。 上述聚陰離子係指「游離酸狀態之酸性聚合物」，較佳為高分子羧酸或高分子磺酸等。作為高分子羧酸之具體例，可例示：聚丙烯酸、聚甲基丙烯酸、聚順丁烯二酸。作為高分子磺酸之具體例，可例示：聚苯乙烯磺酸、聚乙烯磺酸。其中，就導電性之方面而言，最佳為聚苯乙烯磺酸。再者，亦可採用一部分游離酸經中和之鹽之形式。認為於聚噻吩或聚噻吩衍生物之聚合時，藉由使用該等聚陰離子，容易使原本不溶於水之聚噻吩系化合物進行水分散或水性化，且作為酸之功能亦發揮出作為聚噻吩系化合物之摻雜劑之功能。 又，高分子羧酸或高分子磺酸亦可以與能夠共聚合之其他單體、例如丙烯酸酯、甲基丙烯酸酯、苯乙烯等進行共聚合之形式使用。 用作聚陰離子之高分子羧酸或高分子磺酸之分子量並無特別限定，就塗劑之穩定性或導電性之方面而言，其重量平均分子量較佳為1000～1000000，更佳為5000～150000。可於不阻礙本發明之特性之範圍內，包含一部分鋰鹽或鈉鹽等鹼金屬鹽或者銨鹽等。可知於為經中和之鹽之情形時，作為非常強之酸而發揮作用之聚苯乙烯磺酸及銨鹽亦因中和後之平衡反應之進行，而於酸性側失去平衡，認為由此作為摻雜劑而發揮作用。 就導電性之方面而言，相對於聚噻吩或聚噻吩衍生物，聚陰離子較佳為以固形物成分重量比計更過量地存在，相對於聚噻吩或聚噻吩衍生物1重量份，聚陰離子較佳為0.5重量份～5重量份，較佳為1重量份～5重量份，更佳為1重量份～3重量份。關於包含上述聚噻吩或聚噻吩衍生物及聚陰離子之組合物，例如，於日本專利特開平6-295016號公報、日本專利特開平7-292081號公報、日本專利特開平1-313521號公報、日本專利特開2000-6324號公報、歐洲專利EP602731號、美國專利US5391472號等中有記載例，但亦可為該等以外之方法。若列舉一例，則以3,4-二羥基噻吩-2,5-二羧酸酯之鹼金屬鹽作為起始物質，獲得3,4-乙二氧基噻吩後，於聚苯乙烯磺酸水溶液中導入過氧二硫酸鉀、硫酸鐵、及之前獲得之3,4-乙二氧基噻吩，進行反應，獲得聚苯乙烯磺酸等聚陰離子與聚(3,4-乙二氧基噻吩)等聚噻吩複合體化而成之組合物。 關於包含上述聚噻吩及聚陰離子之組合物、或包含上述聚噻吩衍生物及聚陰離子之組合物，例如，於「導電性聚合物技術之最新動向」(東麗研究中心股份有限公司發行，1999年6月1日，第1次印刷)中亦有記載例。 可構成防靜電層之黏合劑聚合物係定義為依據「高分子化合物安全性評價流程圖」(1985年11月，化學物質審議會主辦)，藉由凝膠滲透層析法(GPC)測定所獲得之數量平均分子量(Mn)為1000以上之高分子化合物且具有造膜性者。但是，上述聚陰離子除外。 作為黏合劑聚合物，只要可與聚噻吩或聚噻吩衍生物相溶或混合分散，則可為熱硬化性樹脂，亦可為熱塑性樹脂。例如可列舉：聚對苯二甲酸乙二酯、聚對苯二甲酸丁二酯、聚萘二甲酸乙二酯等聚酯樹脂；聚醯亞胺、聚醯胺醯亞胺等聚醯亞胺樹脂；聚醯胺6、聚醯胺6,6、聚醯胺12、聚醯胺11等聚醯胺樹脂；聚偏二氟乙烯、聚氟乙烯、聚四氟乙烯、伸乙基四氟乙烯共聚物、聚氯三氟乙烯等氟樹脂；聚乙烯醇、聚乙烯醚、聚乙烯醇縮丁醛、聚乙酸乙烯酯、聚氯乙烯等乙烯基樹脂；環氧樹脂；氧雜環丁烷樹脂；二甲苯樹脂；芳香族聚醯胺樹脂；聚醯亞胺聚矽氧樹脂；聚胺基甲酸酯樹脂；聚脲樹脂；三聚氰胺樹脂；酚樹脂；聚醚樹脂；丙烯酸系樹脂及該等之共聚物等。 該等黏合劑聚合物可溶解於有機溶劑中，亦可賦予磺基或羧基等官能基而進行水溶液化。又，於黏合劑聚合物中，可視需要併用交聯劑、聚合起始劑等硬化劑、聚合促進劑、溶劑、黏度調整劑等。 於上述黏合劑聚合物中，就容易進行製作塗佈液時之混合之方面而言，較佳為選自聚酯樹脂、丙烯酸系樹脂、聚胺基甲酸酯樹脂中之任一種以上。其中，較佳為聚胺基甲酸酯樹脂。 聚酯樹脂係定義為以二羧酸成分及二醇成分作為構成成分之線性聚酯。作為二羧酸成分，可例示：對苯二甲酸、間苯二甲酸、鄰苯二甲酸、2,6-萘二甲酸、4,4-二苯基二羧酸、1,4-環己烷二羧酸、己二酸、癸二酸、苯基茚滿二羧酸、二聚酸等。該等成分可使用兩種以上。進而，可與該等成分一起，使用少比率之順丁烯二酸、反丁烯二酸、伊康酸等之類之不飽和多元酸、或對羥基苯甲酸、對(β-羥基乙氧基)苯甲酸等之類之羥基羧酸。不飽和多元酸成分或羥基羧酸成分之比率較佳為10莫耳%以下，更佳為5莫耳%以下。 又，作為二醇成分，可例示：乙二醇、1,4-丁二醇、新戊二醇、二乙二醇、二丙二醇、1,6-己二醇、1,4-環己烷二甲醇、苯二甲醇、二羥甲基丙酸、甘油、三羥甲基丙烷、聚(伸乙氧基)二醇、聚(四亞甲氧基)二醇、雙酚A之環氧烷加成物、氫化雙酚A之環氧烷加成物等。該等可使用2種以上。 於此種二醇成分中，較佳為乙二醇、雙酚A之環氧乙烷加成物或環氧丙烷加成物、1,4-丁二醇，進而較佳為乙二醇、雙酚A之環氧乙烷加成物或環氧丙烷加成物。又，為了容易進行水性液化，可使若干量之具有磺酸鹽基之化合物或具有羧酸鹽基之化合物與上述聚酯樹脂進行共聚合，較佳為該情況。作為該具有磺酸鹽基之化合物，例如可較佳地列舉：間苯二甲酸-5-磺酸鈉、間苯二甲酸-5-磺酸銨、間苯二甲酸-4-磺酸鈉、磺基間苯二甲酸-4-甲基銨、間苯二甲酸-2-磺酸鈉、間苯二甲酸-5-磺酸鉀、間苯二甲酸-4-磺酸鉀、間苯二甲酸-2-磺酸鉀、磺基丁二酸鈉等磺酸鹼金屬鹽系或磺酸胺鹽系化合物等。 作為丙烯酸系樹脂，為含有包含丙烯酸系、甲基丙烯酸系單體之聚合性單體之聚合物。可為均聚物或共聚物中之任一種。又，不僅包含具有與上述聚合性單體不同之具有碳-碳雙鍵之聚合性單體之共聚物，亦包含該等聚合物與其他聚合物(例如聚酯、聚胺基甲酸酯等)之共聚物。例如為嵌段共聚物、接枝共聚物。進而，亦包含於聚酯溶液或聚酯分散液中使具有碳-碳雙鍵之聚合性單體進行聚合而獲得之聚合物(根據情況為聚合物之混合物)。同樣亦包含於聚胺基甲酸酯溶液、聚胺基甲酸酯分散液中使具有碳-碳雙鍵之聚合性單體進行聚合而獲得之聚合物(根據情況為聚合物之混合物)。同樣亦包含於其他聚合物溶液或分散液中使具有碳-碳雙鍵之聚合性單體進行聚合而獲得之聚合物(根據情況為聚合物混合物)。 作為上述具有碳-碳雙鍵之聚合性單體，並無特別限定，作為代表性之化合物，丙烯酸、甲基丙烯酸、丁烯酸、伊康酸、反丁烯二酸、順丁烯二酸、甲基順丁烯二酸之類之各種含羧基單體類、及該等之鹽；(甲基)丙烯酸2-羥基乙酯、(甲基)丙烯酸2-羥基丙酯、(甲基)丙烯酸4-羥基丁酯、反丁烯二酸單丁基羥基酯、伊康酸單丁基羥基酯之類之各種含羥基單體類；(甲基)丙烯酸甲酯、(甲基)丙烯酸乙酯、(甲基)丙烯酸丙酯、(甲基)丙烯酸丁酯、(甲基)丙烯酸月桂酯之類之各種(甲基)丙烯酸酯類；(甲基)丙烯醯胺、二丙酮丙烯醯胺、N-羥甲基丙烯醯胺或(甲基)丙烯腈等之類之各種含氮乙烯基系單體類。又，可與該等併用而使如以下所示之聚合性單體進行共聚合。即，可例示：苯乙烯、α-甲基苯乙烯、二乙烯基苯、乙烯基甲苯之類之各種苯乙烯衍生物；乙酸乙烯酯、丙酸乙烯酯之類之各種乙烯酯類；γ-甲基丙烯醯氧基丙基三甲氧基矽烷、乙烯基三甲氧基矽烷、甲基丙烯醯基矽大分子單體等之類之各種含矽聚合性單體類；含磷乙烯基系單體類；氯乙烯、偏二氯乙烯、氟乙烯、偏二氟乙烯、三氟氯乙烯、四氟乙烯、氯三氟乙烯、六氟丙烯之類之各種鹵化乙烯類；丁二烯之類之各種共軛二烯類等。 於丙烯酸系樹脂中，玻璃轉移溫度(以下，有時簡稱為Tg)較佳為40℃以上，進而較佳為60℃以上。於Tg未達40℃之情形時，有於使塗佈層之塗佈厚度較厚以提昇接著性之情況下，產生容易黏連等不良情況之情形。 聚胺基甲酸酯樹脂係指於分子內具有胺基甲酸酯鍵之高分子化合物。其中，於考慮對線內塗佈之適應性之情形時，較佳為水分散性或水溶性之聚胺基甲酸酯樹脂。為了賦予水分散性或水溶性，可將羥基、羧基、磺酸基、磺醯基、磷酸基、醚基等親水性基導入至聚胺基甲酸酯樹脂。於上述親水性基中，就塗膜物性及密接性提昇之觀點而言，較佳為使用羧酸基或磺酸基。 作為聚胺基甲酸酯樹脂之具體之製造例，例如可列舉利用羥基與異氰酸酯之反應之方法。作為用作原料之羥基，較佳為使用多元醇，例如可列舉：聚醚多元醇類、聚酯多元醇類、聚碳酸酯系多元醇類、聚烯烴多元醇類、丙烯酸系多元醇類。該等化合物可單獨使用，亦可使用複數種。 作為聚醚多元醇類，可列舉：聚乙二醇、聚丙二醇、乙二醇-丙二醇共聚物、聚四亞甲基醚二醇、聚六亞甲基醚二醇等。 作為聚酯多元醇類，可列舉自多元羧酸(丙二酸、丁二酸、戊二酸、己二酸、庚二酸、辛二酸、癸二酸、反丁烯二酸、順丁烯二酸、對苯二甲酸、間苯二甲酸等)或該等之酸酐與多元醇(乙二醇、二乙二醇、三乙二醇、丙二醇、二丙二醇、三丙二醇、丁二醇、1,3-丁二醇、1,4-丁二醇、2,3-丁二醇、2-甲基-1,3-丙二醇、1,5-戊二醇、新戊二醇、1,6-己二醇、3-甲基-1,5-戊二醇、2-甲基-2,4-戊二醇、2-甲基-2-丙基-1,3-丙二醇、1,8-辛二醇、2,2,4-三甲基-1,3-戊二醇、2-乙基-1,3-己二醇、2,5-二甲基-2,5-己二醇、1,9-壬二醇、2-甲基-1,8-辛二醇、2-丁基-2-乙基-1,3-丙二醇、2-丁基-2-己基-1,3-丙二醇、環己二醇、雙(羥基甲基)環己烷、二甲醇苯、雙(羥基乙氧基)苯、烷基二烷醇胺、內酯二醇等)之反應而獲得者。 作為聚碳酸酯系多元醇類，可列舉自多元醇類及碳酸二甲酯、碳酸二乙酯、碳酸二苯酯、碳酸乙二酯等，藉由脫醇反應而獲得之聚碳酸酯二醇、例如聚(1,6-伸己基)碳酸酯、聚(3-甲基-1,5-伸戊基)碳酸酯等。 作為用於獲得聚胺基甲酸酯樹脂之聚異氰酸酯化合物，可例示：甲苯二異氰酸酯、苯二甲基二異氰酸酯、亞甲基二苯基二異氰酸酯、苯二異氰酸酯、萘二異氰酸酯、聯甲苯胺二異氰酸酯等芳香族二異氰酸酯；α,α,α',α'-四甲基苯二甲基二異氰酸酯等具有芳香環之脂肪族二異氰酸酯、亞甲基二異氰酸酯、丙二異氰酸酯、離胺酸二異氰酸酯、三甲基六亞甲基二異氰酸酯、六亞甲基二異氰酸酯等脂肪族二異氰酸酯；環己烷二異氰酸酯、甲基環己烷二異氰酸酯、異佛爾酮二異氰酸酯、二環己基甲烷二異氰酸酯、亞異丙基二環己基二異氰酸酯等脂環式二異氰酸酯等。該等可單獨使用，亦可併用複數種。 於合成聚胺基甲酸酯樹脂時，可使用先前公知之鏈延長劑，作為鏈延長劑，只要為具有2個以上之與異氰酸基反應之活性基者則並無特別限定，廣泛使用具有2個羥基或胺基之鏈延長劑。 可列舉如下情況：作為具有2個羥基之鏈延長劑，例如可例示：乙二醇、丙二醇、丁二醇等脂肪族二醇；苯二甲醇、雙(羥基乙氧基)苯等芳香族二醇；新戊二醇羥基特戊酸酯等酯二醇等二醇類。又，作為具有2個胺基之鏈延長劑，例如可列舉：甲苯二胺、苯二甲胺、二苯基甲二胺等芳香族二胺；乙二胺、丙二胺、己二胺、2,2-二甲基-1,3-丙二胺、2-甲基-1,5-戊二胺、三甲基己二胺、2-丁基-2-乙基-1,5-戊二胺、1,8-辛二胺、1,9-壬二胺、1,10-癸二胺等脂肪族二胺；1-胺基-3-胺基甲基-3,5,5-三甲基環己烷、二環己基甲二胺、亞異丙基環己基-4,4'-二胺、1,4-二胺基環己烷、1,3-雙(胺基甲基)環己烷等脂環式二胺等。 關於防靜電層中之黏合劑聚合物之調配比率，為10～80重量%之範圍，更佳為20～60重量%之範圍。於該範圍未達10重量%之情形時，有對聚酯膜之密接性降低之情形。另一方面，於超過80重量%之情形時，有接著性能成為飽和狀態，增量其以上亦無法獲得明顯之效果之情形。 為了將防靜電層塗設於聚酯膜上，較佳為於防靜電層用塗佈液中含有選自由甘油(C1)、聚甘油(C2)、及對甘油或聚甘油之環氧烷加成物(C3)所組成之群中之1種以上之化合物或其衍生物，以使塗佈性良好。 甘油、聚甘油係下述式(III)所表示之化合物。 [化3]上述式(III)中，n＝1之化合物為甘油，n為2以上之化合物為聚甘油。於本發明中，上述式(III)之n較佳為1～20之範圍，更佳為2～20之範圍。其中，就防靜電層之透明性之觀點而言，更佳為聚甘油。 又，對甘油或聚甘油之環氧烷加成物即為具有對式(III)所表示之甘油或聚甘油之羥基加成聚合環氧烷或其衍生物而成之結構者。 此處，對甘油或聚甘油骨架之每一個羥基加成之環氧烷或其衍生物之結構可不同。又，只要至少對分子中之一個羥基進行加成即可，無須對所有羥基加成環氧烷或其衍生物。 作為環氧烷或其衍生物較佳者係包含環氧乙烷或環氧丙烷骨架之結構。若環氧烷結構中之烷基鏈變得過長，則有疏水性變強，塗佈液中之均一之分散性變差，塗膜之防靜電性或透明性變差之傾向。尤佳者為環氧乙烷。 於此種對甘油或聚甘油之環氧烷加成物中，環氧烷或其衍生物相對於甘油或聚甘油骨架之共聚合比率並無特別限定，於以分子量比計，將甘油或聚甘油部分設為1時，環氧烷部分較佳為20以下，更佳為10以下。於環氧烷或其衍生物相對於甘油或聚甘油骨架之比率大於該範圍之情形時，有接近使用通常之聚環氧烷之情形時之特性，無法獲得所需之性能之情形。 關於本發明中之化合物，作為尤佳之態樣，可例示聚甘油(C2)、及對甘油或聚甘油之環氧烷加成物(C3)。作為聚甘油(C2)，尤佳為上述式(III)之化合物中n為2～20之化合物。又，作為對甘油或聚甘油之環氧烷加成物(C3)，尤佳為對上述式(III)之化合物中n＝2之化合物加成環氧乙烷及/或聚環氧乙烷而成之結構者，又，其加成數尤佳為以最終之化合物(C3)之重量平均分子量計成為300～2000之範圍者。 構成積層聚酯膜之防靜電層中所占之聚噻吩或聚噻吩衍生物之重量較佳為0.5 mg/m2
以上，更佳為1 mg/m2
以上。藉由將該重量設為0.5 mg/m2
以上，可具有充分之防靜電性。另一方面，作為上限，並無特別限定，較佳為100 mg/m2
以下，更佳為50 mg/m2
以下。 又，防靜電層100重量%中所占之聚噻吩或聚噻吩衍生物之重量比率並無限定，關於上限，較佳為90重量%以下，進而較佳為80重量%以下，最佳為60重量%以下。於該重量比率超過90重量%之情形時，有塗膜之透明性變得不充分之情形。另一方面，關於下限，較佳為1%以上，進而較佳為2重量%以上。於該重量比率未達1重量%之情形時，有防靜電性能變得不充分之情形。 於防靜電層中，聚噻吩或聚噻吩衍生物與黏合劑聚合物之比率較佳為以重量比計為90/10～1/99之範圍。進而較佳為70/30～1/99之範圍，最佳為50/50～10/90之範圍。於偏離該範圍之情形時，有防靜電性能或塗膜之外觀容易變差之傾向。若塗膜之外觀變差，則有積層聚酯膜之外觀出現深淺差異、即色不均，引起檢查時之異物誤認之虞，故而不佳。 於本發明中之防靜電層(塗佈層1)中，可含有消泡劑、塗佈性改良劑、增黏劑、有機系潤滑劑、脫模劑、有機粒子、無機粒子、抗氧化劑、紫外線吸收劑、發泡劑、染料、顏料等添加劑。該等添加劑可單獨使用，亦可視需要併用兩種以上。又，若使用其結構中包含(聚)環氧烷或(聚)甘油、該等之衍生物者作為該等添加劑，則不會阻礙所獲得之防靜電層之防靜電性，從而更佳。 就操作性上、作業環境上、以及塗佈液組合物之穩定性之方面而言，形成本發明中之防靜電層(塗佈層1)之塗佈液較理想為水溶液或水分散液，只要為以水作為主要之介質，不超過本發明之主旨之範圍，則可含有有機溶劑。 本發明中之防靜電層較佳為藉由將含有特定之化合物之塗佈液塗佈於聚酯膜而設置，於本發明中，尤佳為藉由於聚酯膜之製膜中進行塗佈之線內塗佈而設置。 積層聚酯膜之防靜電層表面之表面固有電阻值R較佳為1×109
Ω以下。R更佳為1×108
Ω以下，進而較佳為1×107
Ω以下。藉由將R設為1×109
Ω以下，可抑制於用作表面保護膜時，於積層聚酯膜之剝離時夾帶異物等不良情況。 [易接著層(塗佈層2)] 較佳為於上述聚酯膜之單面具有防靜電層，於與該防靜電層相反之一側之面上設置易接著層(塗佈層2)，以提昇對黏著層之接著性。於聚酯膜為依序積層最表層(表層A)、中間層、最表層(表層B)而成之3層構造之情形時，較佳為於上述聚酯膜中之表層B之上具有易接著層。作為具體之成分，較佳為於易接著層中含有黏合劑聚合物及交聯劑。 構成易接著層之黏合劑聚合物並無特別限定，亦可使用與上述防靜電層中之黏合劑聚合物相同者。其中，作為更佳之黏合劑聚合物，可列舉聚酯樹脂。 於構成易接著層之上述聚酯樹脂中，玻璃轉移溫度(以下，有時簡稱為Tg)較佳為40℃以上，更佳為60℃以上。於Tg未達40℃之情形時，有於使易接著層之塗佈厚度較厚以提昇接著性之情況下，產生容易黏連等不良情況之情形。 又，於易接著層之形成中，為了提昇塗佈外觀，或者提昇於易接著層上形成有黏著層時之密接性，亦可於無損本發明之主旨之範圍內，併用聚酯樹脂以外之聚合物。 作為聚合物之具體例，可列舉：丙烯酸系樹脂、聚胺基甲酸酯樹脂、聚乙烯基系樹脂(聚乙烯醇等)、聚伸烷基二醇、聚伸烷基亞胺、甲基纖維素、羥基纖維素、澱粉類等。於該等中，就提昇接著性之觀點而言，較佳為使用丙烯酸系樹脂或聚胺基甲酸酯樹脂。 構成易接著層之交聯劑可使用各種公知之交聯劑，例如可列舉：㗁唑啉化合物、三聚氰胺化合物、環氧化合物、異氰酸酯系化合物、碳二醯亞胺系化合物、矽烷偶合化合物等。於該等中，尤其於用於在易接著層上設置功能層(例如黏著層)之用途之情形時，就提昇耐久密接性之觀點而言，較佳為使用㗁唑啉化合物。 㗁唑啉化合物係於分子內具有㗁唑啉基之化合物，尤佳為含有㗁唑啉基之聚合物，可單獨藉由加成聚合性含㗁唑啉基單體而製作，或者藉由與其他單體之聚合而製作。加成聚合性含㗁唑啉基單體可列舉：2-乙烯基-2-㗁唑啉、2-乙烯基-4-甲基-2-㗁唑啉、2-乙烯基-5-甲基-2-㗁唑啉、2-異丙烯基-2-㗁唑啉、2-異丙烯基-4-甲基-2-㗁唑啉、2-異丙烯基-5-乙基-2-㗁唑啉等，可使用該等中之1種或2種以上之混合物。於該等中，2-異丙烯基-2-㗁唑啉係工業上亦容易獲取，從而較佳。其他單體只要為可與加成聚合性含㗁唑啉基單體進行共聚合之單體則並無限制，例如可列舉：(甲基)丙烯酸烷基酯(作為烷基，為甲基、乙基、正丙基、異丙基、正丁基、異丁基、第三丁基、2-乙基己基、環己基)等(甲基)丙烯酸酯類；丙烯酸、甲基丙烯酸、伊康酸、順丁烯二酸、反丁烯二酸、丁烯酸、苯乙烯磺酸及其鹽(鈉鹽、鉀鹽、銨鹽、三級胺鹽等)等不飽和羧酸類；丙烯腈、甲基丙烯腈等不飽和腈類；(甲基)丙烯醯胺、N-烷基(甲基)丙烯醯胺、N,N-二烷基(甲基)丙烯醯胺(作為烷基，為甲基、乙基、正丙基、異丙基、正丁基、異丁基、第三丁基、2-乙基己基、環己基等)等不飽和醯胺類；乙酸乙烯酯、丙酸乙烯酯等乙烯酯類；甲基乙烯醚、乙基乙烯醚等乙烯醚類；乙烯、丙烯等α-烯烴類；氯乙烯、偏二氯乙烯、氟乙烯等含鹵素α,β-不飽和單體類；苯乙烯、α-甲基苯乙烯等α,β-不飽和芳香族單體等，可使用該等中之1種或2種以上之單體。 㗁唑啉化合物之㗁唑啉基量較佳為0.5 mmol/g以上，更佳為3 mmol/g以上，進而較佳為5 mmol/g以上，而且，較佳為10 mmol/g以下，更佳為9 mmol/g以下，進而較佳為8 mmol/g以下。藉由於上述範圍內使用，塗膜之耐久性提昇。 三聚氰胺化合物係於化合物中具有三聚氰胺結構之化合物，例如可使用羥烷化三聚氰胺衍生物、使醇與羥烷化三聚氰胺衍生物進行反應而部分或完全醚化之化合物、及該等之混合物。作為醚化中使用之醇，較佳為使用甲醇、乙醇、異丙醇、正丁醇、異丁醇等。又，作為三聚氰胺化合物，可為單體、或二聚物以上之多聚物中之任一種，或者亦可使用該等之混合物。進而，可使用使脲等與三聚氰胺之一部分進行共縮合而成者，為了提高三聚氰胺化合物之反應性，亦可使用觸媒。 環氧化合物係於分子內具有環氧基之化合物，例如可列舉：表氯醇與乙二醇、聚乙二醇、甘油、聚甘油、雙酚A等之羥基或胺基之縮合物，有聚環氧化合物、二環氧化合物、單環氧化合物、縮水甘油胺化合物等。作為聚環氧化合物，例如可列舉：山梨醇聚縮水甘油醚、聚甘油聚縮水甘油醚、季戊四醇聚縮水甘油醚、二甘油聚縮水甘油醚、三縮水甘油基三(2-羥基乙基)異氰酸酯、甘油聚縮水甘油醚、三羥甲基丙烷聚縮水甘油醚；作為二環氧化合物，例如可列舉：新戊二醇二縮水甘油醚、1,6-己二醇二縮水甘油醚、間苯二酚二縮水甘油醚、乙二醇二縮水甘油醚、聚乙二醇二縮水甘油醚、丙二醇二縮水甘油醚、聚丙二醇二縮水甘油醚、聚四亞甲基二醇二縮水甘油醚；作為單環氧化合物，例如可列舉：烯丙基縮水甘油醚、2-乙基己基縮水甘油醚、苯基縮水甘油醚；作為縮水甘油胺化合物，可列舉：N,N,N',N'-四縮水甘油基-間苯二甲胺、1,3-雙(N,N-二縮水甘油基胺基)環己烷等。 異氰酸酯系化合物係具有以異氰酸酯或嵌段異氰酸酯為代表之異氰酸酯衍生物結構之化合物。作為異氰酸酯，例如可例示：甲苯二異氰酸酯、苯二甲基二異氰酸酯、亞甲基二苯基二異氰酸酯、苯二異氰酸酯、萘二異氰酸酯等芳香族異氰酸酯；α,α,α',α'-四甲基苯二甲基二異氰酸酯等具有芳香環之脂肪族異氰酸酯、亞甲基二異氰酸酯、丙二異氰酸酯、離胺酸二異氰酸酯、三甲基六亞甲基二異氰酸酯、六亞甲基二異氰酸酯等脂肪族異氰酸酯；環己烷二異氰酸酯、甲基環己烷二異氰酸酯、異佛爾酮二異氰酸酯、亞甲基雙(4-環己基異氰酸酯)、亞異丙基二環己基二異氰酸酯等脂環式異氰酸酯等。 碳二醯亞胺系化合物係具有碳二醯亞胺結構之化合物，為於分子內具有1個以上之碳二醯亞胺結構之化合物，為了獲得更良好之密接性等，更佳為於分子內具有2個以上之聚碳二醯亞胺系化合物。 碳二醯亞胺系化合物可藉由先前公知之技術合成，一般使用二異氰酸酯化合物之縮合反應。作為二異氰酸酯化合物，並無特別限定，可使用芳香族系、脂肪族系中之任一種，具體而言，可列舉：甲苯二異氰酸酯、苯二甲基二異氰酸酯、二苯基甲烷二異氰酸酯、苯二異氰酸酯、萘二異氰酸酯、六亞甲基二異氰酸酯、三甲基六亞甲基二異氰酸酯、環己烷二異氰酸酯、甲基環己烷二異氰酸酯、異佛爾酮二異氰酸酯、二環己基二異氰酸酯、二環己基甲烷二異氰酸酯等。 該等交聯劑可單獨使用，亦可併用2種以上。 於含有交聯劑成分之情形時，可同時併用用以促進交聯之成分、例如交聯觸媒等。 又，於各塗佈層(防靜電層、易接著層)之形成中，亦可併用粒子以改良黏連、滑動性。就膜之透明性之觀點而言，其平均粒徑為較佳為1.0 μm以下、進而較佳為0.5 μm以下、尤佳為0.2 μm以下之範圍。又，為了進一步提昇滑動性，下限為較佳為0.01 μm以上、更佳為0.03 μm以上、尤佳為大於塗佈層之膜厚之範圍。作為使用之粒子之具體例，可列舉：二氧化矽、氧化鋁、高嶺土、碳酸鈣、有機粒子等。 進而，亦可於無損本發明之主旨之範圍內，於各塗佈層之形成中，視需要併用消泡劑、塗佈性改良劑、增黏劑、有機系潤滑劑、防靜電劑、紫外線吸收劑、抗氧化劑、發泡劑、染料、顏料等。 作為構成積層聚酯膜之各塗佈層之厚度(乾燥後)，通常為0.003～1 μm，較佳為0.005～0.5 μm，進而較佳為0.01～0.2 μm。於厚度薄於0.003 μm之情形時，有自膜析出之酯環狀三聚物量未變得足夠少之情況。又，於厚於1 μm之情形時，有產生塗佈層之外觀變差或黏連性降低等不良情況之情形。 又，本發明之積層聚酯膜整體之厚度只要為可製膜之範圍則並無特別限定，較佳為12 μm以上，更佳為25 μm以上，而且，較佳為250 μm以下，更佳為125 μm以下。 [塗佈方法] 作為將塗佈液塗佈於聚酯膜之方法，例如可使用氣刀塗佈、刮刀塗佈、桿式塗佈、棒式塗佈、刮塗、擠壓塗佈、含浸塗佈、逆輥塗佈、傳送輥塗佈、凹版塗佈、接觸輥式塗佈、澆鑄塗佈、噴霧塗佈、淋幕式塗佈、軋光塗佈、擠出塗佈等先前公知之塗佈方法。 為了改良塗佈液對膜之塗佈性、密接性，可於塗佈之前對聚酯膜實施化學處理或電暈放電處理、電漿處理等。 於藉由線內塗佈將各塗佈層(防靜電層、易接著層)設置於聚酯膜上之情形時，較佳為按照如下要點製造積層聚酯膜：以上述一連串之化合物作為水溶液或水分散體，將固形物成分濃度將0.1～50重量%左右調整為標準之塗佈液塗佈於聚酯膜上。又，可於無損本發明之主旨之範圍內，以對水之分散性改良、造膜性改良等為目的，於塗佈液中含有少量之有機溶劑。有機溶劑可僅為1種，亦可適當使用2種以上。 關於將各塗佈層形成於聚酯膜上時之乾燥及硬化條件，並無特別限定，例如，於藉由離線塗佈而設置各塗佈層之情形時，較佳為以通常於80～200℃下3～40秒、較佳為於100～180℃下3～40秒作為標準而進行熱處理。 另一方面，於藉由線內塗佈而設置各塗佈層之情形時，較佳為以通常於70～280℃下3～200秒作為標準而進行熱處理。 本發明之積層聚酯膜之霧度較佳為2%以下。進而較佳為1%以下，最佳為0.6%以下。於積層聚酯膜之霧度超過2%之情形時，有於作為表面保護膜之結構單元，用於伴隨光學評價之檢查之情形時，帶來障礙之情形。 [表面保護膜] 本發明之表面保護膜只要至少具有上述本發明之積層聚酯膜即可，可單獨為本發明之積層聚酯膜，但較佳為通常為進而具有黏著層以賦予黏著性之構成。再者，表面保護膜係指本發明之積層聚酯膜之用途之一態樣，於上述本發明之積層聚酯膜設置黏著層而成之層構成本身係本發明之積層聚酯膜之一態樣。 [黏著層] 其次，以下，對本發明中之黏著層進行說明。 於表面保護膜中，較佳為於積層聚酯膜之易接著層上設置黏著層。黏著層可僅設置於積層聚酯膜之單面，亦可設置於兩面，較佳為設置於單面。於設置於單面之情形時，可設置於防靜電層、易接著層中之任一面，較佳為設置於易接著層上。 本發明中之黏著層意指包含具有黏著性之材料之層，可於無損本發明中之主旨之範圍內，使用聚矽氧系黏著劑、丙烯酸系黏著劑等先前公知之材料。其中，就黏著特性之調整範圍較廣，廣泛使用之方面而言，較佳為丙烯酸系黏著劑。 於本發明中，以下，對使用丙烯酸系黏著劑作為具體例之情形進行說明。 丙烯酸系黏著劑意指含有以丙烯酸系單體作為必需之單體(monomer)成分而形成之丙烯酸系聚合物作為基礎聚合物之黏著劑。該丙烯酸系聚合物較佳為以具有直鏈或支鏈狀之烷基之(甲基)丙烯酸烷基酯及/或(甲基)丙烯酸烷氧基烷基酯作為必需之單體成分(進而較佳為作為主要之單體成分)而形成。進而，丙烯酸系聚合物尤佳為以具有直鏈或支鏈狀之烷基之(甲基)丙烯酸烷基酯及丙烯酸烷氧基烷基酯作為必需之單體成分而形成之丙烯酸系聚合物。即，本發明中之黏著層尤佳為藉由以具有直鏈或支鏈狀之烷基之(甲基)丙烯酸烷基酯及丙烯酸烷氧基烷基酯作為必需之單體成分而形成之丙烯酸系黏著劑所形成的層。 又，於形成丙烯酸系聚合物之單體成分中，可進而包含含極性基單體、多官能性單體或其他共聚合性單體作為共聚合單體成分。 再者，上述「(甲基)丙烯酸」表示「丙烯酸」及/或「甲基丙烯酸」，其他亦相同。又，並無特別限定，作為基礎聚合物之丙烯酸系聚合物之黏著層中之含量相對於黏著層之總重量(100重量%)，較佳為60重量%以上，進而較佳為80重量%以上。 於黏著層中，可於無損本發明之主旨之範圍內，視需要使用交聯劑、交聯促進劑、黏著賦予劑(例如松脂衍生物樹脂、聚萜烯樹脂、石油樹脂、油溶性酚樹脂等)、防老化劑、填充劑、著色劑(顏料或染料等)、紫外線吸收劑、抗氧化劑、鏈轉移劑、塑化劑、軟化劑、界面活性劑、防靜電劑等。 上述交聯劑係藉由使黏著層之基礎聚合物進行交聯，可控制黏著層之凝膠分率。作為交聯劑，可列舉：異氰酸酯系交聯劑、環氧系交聯劑、三聚氰胺系交聯劑等，可較佳地使用異氰酸酯系交聯劑或環氧系交聯劑。又，交聯劑可單獨使用，亦可併用2種以上。 作為表面保護膜之黏著層之厚度(乾燥後)，較佳為10～100 μm、較佳為20～50 μm之範圍。於黏著層之厚度(乾燥後)未達10 μm之情形時，有難以獲得所需之黏著力之情形。另一方面，於黏著層之厚度(乾燥後)超過100 μm之情形時，有黏著層之硬化變得不充分，產生作業性降低等不良情況之情形。 又，關於表面保護膜整體之厚度，只要黏著性及作業性充分則並無特別限定，較佳為22～350 μm，更佳為45～175 μm。 將本發明之較佳之一實施形態示於以下。 ＜A1＞一種積層聚酯膜，其特徵在於：其係具有至少3層以上之積層構造者，並且一最表層(表層A)實質上不含有粒子，於該表層A上，設置有含有聚噻吩或聚噻吩衍生物及黏合劑聚合物之塗佈層1。 ＜A2＞如上述＜A1＞記載之積層聚酯膜，其包含鈦系聚合觸媒。 ＜A3＞如上述＜A1＞或＜A2＞記載之積層聚酯膜，其中於另一最表層(表層B)上，設置有含有聚酯樹脂及交聯劑之塗佈層2。 ＜A4＞如上述＜A3＞記載之積層聚酯膜，其中於上述塗佈層2上進而具有黏著層。 ＜A5＞如上述＜A4＞記載之積層聚酯膜，其中上述黏著層包含丙烯酸系黏著劑。 ＜A6＞一種表面保護膜，其包含如上述＜A4＞或＜A5＞記載之積層聚酯膜。 又，將本發明之另一較佳之一實施形態示於以下。 ＜B1＞一種塗佈膜，其特徵在於：具有具有至少3層以上之積層構造之多層聚酯膜，於該多層聚酯膜之中間層含有紫外線吸收劑，於該多層聚酯膜之一最表層(表層A)實質上不含有粒子，且於該最表層(表層A)之上，設置有含有防靜電劑及黏合劑聚合物之塗佈層1。 ＜B2＞如上述＜B1＞記載之塗佈膜，其中上述防靜電劑為聚噻吩或聚噻吩衍生物。 ＜B3＞如上述＜B1＞或＜B2＞記載之塗佈膜，其中於上述多層聚酯膜中含有鈦系聚合觸媒。 ＜B4＞如上述＜B1＞至＜B3＞中任一項記載之塗佈膜，其中於上述多層聚酯膜之另一最表層(表層B)之上，設置有含有聚酯樹脂及交聯劑之塗佈層2。 ＜B5＞如上述＜B4＞記載之塗佈膜，其中於上述塗佈層2之表面設置有黏著層。 ＜B6＞如上述＜B5＞記載之塗佈膜，其中上述黏著層係藉由丙烯酸系黏著劑形成。 ＜B7＞一種表面保護膜，其包含如上述＜B1＞至＜B6＞中任一項記載之塗佈膜。 [實施例] 以下，藉由實施例更詳細地說明本發明，但本發明只要不超過其主旨，則並不限定於以下之實施例。又，本發明中所使用之測定法如下所述。 (1)聚酯之極限黏度(dL/g) 精秤去除不溶於聚酯之其他聚合物成分及顏料後之聚酯1 g，加入苯酚/四氯乙烷＝50/50(重量比)之混合溶劑100 mL並使之溶解，於30℃下進行測定。 (2)平均粒徑(d50) 將使用離心沈降式粒度分佈測定裝置(島津製作所股份有限公司製造之「SA-CP3型」)所測得之等效球形分佈中之累計體積分率50%的粒徑設為平均粒徑d50。 (3)聚酯原料中所含有之酯環狀三聚物含量(低聚物含量) 秤量約200 mg之聚酯原料，溶解於氯仿/HFIP(六氟-2-異丙醇)之體積比率3：2之混合溶劑2 mL中。溶解後，追加氯仿20 mL，然後一點點加入甲醇10 mL。藉由過濾而去除沈澱物，進而，藉由氯仿/甲醇之體積比率2：1之混合溶劑清洗沈澱物，回收濾液及清洗液，藉由蒸發器進行濃縮，其後，進行乾燥。將乾燥物溶解於DMF(dimethylformamide，二甲基甲醯胺)25 mL中後，將該溶液供給至液體層析儀(島津製作所股份有限公司製造之「LC-7A」)，求出DMF中之酯環狀三聚物含量，將該值除以溶解於氯仿/HFIP混合溶劑中之聚酯原料量，獲得酯環狀三聚物含量(重量%)。DMF中之酯環狀三聚物含量係根據標準試樣峰值面積與測定試樣峰值面積之峰值面積比而求出(絕對校準曲線法)。 標準試樣之製作係準確地秤量預先製備之酯環狀三聚物，溶解於準確地秤量之DMF中而製作。 再者，液體層析之條件如下所述。 《測定條件》 流動相A：乙腈 流動相B：2重量%乙酸水溶液 管柱：三菱化學股份有限公司製造之「MCI GEL ODS 1HU」 管柱溫度：40℃ 流速：1 mL/分鐘 檢測波長：254 nm (4)層厚度 藉由環氧樹脂將膜小片固定成形後，藉由切片機切斷，藉由穿透式電子顯微鏡照片觀察膜之剖面。藉由明暗而觀察該剖面中與膜表面大致平行之2個界面。自10張照片測定該2個界面與膜表面之距離，以其平均值作為層厚度。 (5)膜中之金屬元素量及磷元素量 使用螢光X射線分析裝置(島津製作所股份有限公司製造，型式「XRF-1500」)，於下述表1所示之條件下，利用膜FP法並藉由單片測定而求出膜中之元素量。再者，本方法中之檢測極限通常為1 ppm左右。 [表1]
(6)霧度(透明性評價) 依據JIS K7136，藉由測霧計「HM-150」(村上色彩技術研究所股份有限公司製造)，測定試樣膜之霧度。其後，基於下述基準進行透明性之評價。 (判定基準) A：霧度為0.6%以下(特別良好) B：霧度超過0.6%且為1.0%以下(良好) C：霧度超過1.0%且為2.0%以下(有實用上成為問題之情形) D：霧度超過2.0%(實用上存在問題) (7)光線透過率 藉由分光光度計(Hitachi High-Tech Fielding股份有限公司製造之U-3310)，測定波長350 nm下之光線透過率。其後，基於下述基準進行判定。 (判定基準) A：光線透過率為7%以下(特別良好) B：光線透過率超過7%且為10%以下(良好) C：光線透過率超過10%(有實用上成為問題之情形) (8)表面固有電阻值R(防靜電性評價) 基於下述(8-1)之方法，測定試樣膜之表面之表面固有電阻。於(8-1)之方法中，高於1×108
Ω之表面固有電阻無法進行測定，故而關於(8-1)中無法測定之樣本，使用(8-2)之方法。 《測定方法》 (8-1)使用低電阻率計「Loresta GP MCP-T600」(三菱化學股份有限公司製造)，於23℃、50%RH之測定環境下將樣本進行濕度控制30分鐘後，測定表面固有電阻值。 (8-2)使用高電阻測定器「HP4339B」及測定電極「HP16008B」(均為日本惠普股份有限公司製造)，於23℃、50%RH之測定環境下將樣本進行濕度控制30分鐘後，測定表面固有電阻值，基於下述基準進行防靜電性之評價。 (判定基準) A：R為1×107
Ω以下(可實用。特別良好) B：R超過1×107
Ω且為1×108
Ω以下(可實用) C：R超過1×108
Ω且為1×109
Ω以下(有實用上成為問題之情形) D：R超過1×109
Ω(難以實用) (9)防靜電層之耐溶劑性評價 於試樣膜之防靜電層表面藉由滴管滴下甲苯溶劑1 mL。 其後，目測觀察自然乾燥後之防靜電層表面，基於下述基準，進行耐溶劑性之評價。 (判定基準) A：無甲苯溶劑之滴下痕跡，耐溶劑性良好。(實用上無問題) B：輕微地確認到甲苯溶劑之滴下痕跡。(有實用上成為問題之情形) C：明顯地確認到甲苯溶劑之滴下痕跡。(實用上存在問題) (10)與黏著層之接著性評價 於試樣膜之易接著層之表面，使用烘烤式敷料器塗佈包含下述黏著劑組成之丙烯酸系黏著劑。此時，塗佈量(乾燥前)設為2 mil。繼而，藉由熱風式循環爐於150℃下熱處理3分鐘，藉此於易接著層之表面設置黏著層。設置有黏著層之試樣膜係藉由重量2 kg之橡膠輥與未處理之PET膜(厚度188 μm)貼合。繼而，將貼合之積層體切割為50 mm×300 mm，測定於室溫下放置1小時後之剝離力。剝離力係使用拉伸試驗機「Intesco Model 2001型」(Intesco股份有限公司製造)，於拉伸速度300 mm/分鐘之條件下，對未處理之PET膜與黏著層之界面進行180°剝離，基於下述基準進行接著性之評價。 《黏著劑組成》 主劑：「AT352」(Saiden Chemical股份有限公司製造) 100重量份 硬化劑：「AL」(Saiden Chemical股份有限公司製造) 0.25重量份 添加劑：「X-301-375SK」(Saiden Chemical股份有限公司製造) 0.25重量份 添加劑：「X-301-352S」(Saiden Chemical股份有限公司製造) 0.4重量份 甲苯：40重量份 (判定基準) A：於黏著層與未處理PET膜之界面發生剝離。(實用上無問題) B：於黏著層與易接著層表面之界面發生剝離。或者於聚酯膜基材與易接著層之界面發生剝離。(實用上存在問題) (11)表面保護膜之視認性評價(1) (低聚物密封性之實用特性代用評價) 將實施例、比較例中所獲得之各表面保護膜預先切割為5 cm見方後，於將浮法玻璃板(尺寸：7 cm見方，厚度2 mm，依據JIS R3202)與黏著層貼合之狀態下，於熱風式循環爐(TABAI製造：型式「PVH-210」)內，於180℃下熱處理10分鐘。其後，於貼合之狀態下，自表面保護膜側進行黏著層之觀察，基於下述基準進行判定。 (判定基準) A：於貼合有表面保護膜之狀態下，能夠進行黏著層之檢查。於熱處理後，表面保護膜之透明性亦非常高，特別容易進行檢查(實用上無問題) B：於貼合有表面保護膜之狀態下，能夠進行黏著層之檢查。表面保護膜之霧度因低聚物析出等而稍微變差，但容易進行檢查(實用上無問題) C：於貼合有表面保護膜之狀態下，能夠進行黏著層之檢查，但有偶爾稍難進行檢查之情形。(有實用上成為問題之情形) D：表面保護膜之霧度因熱處理而變差，故而於貼合有表面保護膜之狀態下，難以進行黏著層之檢查(實用上存在問題) (12)表面保護膜之視認性評價(2) (伴隨光學評價之檢查容易性之實用特性代用評價) 將實施例及比較例中所獲得之各表面保護膜貼合於偏光板，將另一偏光板置於表面保護膜上，一面使該偏光板旋轉一面使視野變得最暗。其後，於上述積層體構成(上部偏光板/表面保護膜(黏著層)/下部偏光板)之狀態下，使用光學顯微鏡(透過光)，自上部偏光板側觀察表面保護膜，並基於下述基準而判定此時之觀察狀態。 (判定基準) A：於貼合有表面保護膜之狀態下，能夠進行偏光板之檢查。即便較暗，視認性亦非常高，特別容易進行檢查(實用上無問題) B：於貼合有表面保護膜之狀態下，能夠進行偏光板之檢查。即便較暗仍有視認性，容易進行檢查(實用上無問題) C：於貼合有表面保護膜之狀態下，能夠進行偏光板之檢查，但有稍難進行檢查之情形。(有實用上成為問題之情形) D：於貼合有表面保護膜之狀態下，難以進行偏光板之檢查。(實用上存在問題) (13)雷射加工性(實用特性代用評價) 使用實施例及比較例中所製造之表面保護膜，於將黏著層面與玻璃面板(厚度：0.33 mm)貼合之狀態下，自玻璃面板側照射YAG雷射(能量密度：600 mJ/cm2
，頻率：20 Hz)，將玻璃面板切斷為60 mm×130 mm尺寸，利用光學顯微鏡觀察切斷面，基於下述基準進行判定。 (判定基準) A：不存在來自表面保護膜之異物附著，或者完全未產生毛邊。(實用上無問題) B：附著極微量之來自表面保護膜之異物，但未產生毛邊。(實用上不成為問題) C：附著極微量之來自表面保護膜之異物，且確認到產生毛邊。(有實用上成為問題之情形) D：明顯附著來自表面保護膜之異物，且確認到產生毛邊。(實用上存在問題) (14)表面保護膜之視認性評價(3) (外觀評價及檢查容易性之實用特性代用評價) 對實施例及比較例中所獲得之各表面保護膜之防靜電層之膜面照射LED光源之反射光，進行外觀之檢查。基於下述基準而判定此時之觀察狀態。 《判定基準》 A：不存在外觀之深淺差異，能夠進行檢查。特別容易進行檢查。 B：可確認到外觀之深淺差異，但仍能夠進行檢查。(實用上無問題) C：可明確地確認到外觀之深淺差異，但有時稍難進行檢查。(有實用上成為問題之情形) D：外觀之深淺差異發生影響，難以進行檢查。(實用上存在問題) (15)利用螢光X射線分析裝置所測得之硫之檢測量之差 針對上述(14)之檢查中所檢測到之外觀之深淺差異最淺之部位及最深之部位，使用螢光X射線分析裝置，以相對值對硫之檢測量之差加以比較。 《判定基準》 A：利用螢光X射線分析裝置所測得之硫之檢測量之差為2重量%以下。 B：利用螢光X射線分析裝置所測得之硫之檢測量之差超過2重量%且為5重量%以下。 C：利用螢光X射線分析裝置所測得之硫之檢測量之差超過5重量%且為8重量%以下。 D：利用螢光X射線分析裝置所測得之硫之檢測量之差超過8重量%。 (16)綜合評價(實用特性代用評價) 使用實施例及比較例中所製造之表面保護膜，進行上述(6)～(15)之評價，基於下述基準進行綜合評價。 (判定基準) A：各評價均為A判定。(實用上無問題。特別良好) B：至少有一者為B判定，其他均為A判定。(實用上無問題) C：至少有一者為C判定，無D判定。(有實用上成為問題之情形) D：至少有一者為D判定。(實用上存在問題)。 實施例及比較例中所使用之聚酯係以如下方式準備。 ＜聚酯(A)之製造方法＞ 以對苯二甲酸二甲酯100重量份及乙二醇60重量份作為起始原料，取作為觸媒之乙酸鎂四水合物0.09重量份置於反應器中，將反應開始溫度設為150℃，蒸餾去除甲醇，並且緩慢地使反應溫度上升，於3小時後設為230℃。4小時後，實質上結束酯交換反應。於該反應混合物中添加酸式磷酸乙酯0.04重量份後，加入三氧化二銻0.04重量份，進行4小時縮聚反應。即，將溫度自230℃緩慢升溫而設為280℃。另一方面，壓力係自常壓緩慢減小，最終設為0.3 mmHg。反應開始後，根據反應槽之攪拌動力之變化，於極限黏度相當於0.63 dL/g之時間停止反應，於氮氣加壓下噴出聚合物。所獲得之聚酯(A)之極限黏度為0.63 dL/g，酯環狀三聚物之含量為0.97重量%。 ＜聚酯(B)之製造方法＞ 使聚酯(A)預先於160℃下預結晶化後，於溫度220℃之氮氣環境下進行固相聚合，而獲得極限黏度為0.75 dL/g、酯環狀三聚物之含量為0.46重量%之聚酯(B)。 ＜聚酯(C)之製造方法＞ 將苯二甲酸二甲酯100重量份、乙二醇60重量份、相對於生成聚酯成為30 ppm之酸式磷酸乙酯、相對於生成聚酯成為100 ppm之作為觸媒之乙酸鎂四水合物加以混合，於氮氣環境下，於260℃下進行酯化反應。繼而，對生成聚酯添加鈦酸四丁酯50 ppm，歷時2小時30分鐘升溫至280℃，並且減壓至絕對壓力0.3 kPa，進而熔融縮聚80分鐘，而獲得極限黏度為0.61 dL/g、酯環狀三聚物之含量為1.02重量%之聚酯(C)。 ＜聚酯(D)之製造方法＞ 使聚酯(C)預先於160℃下預結晶化後，於溫度210℃之氮氣環境下進行固相聚合，獲得極限黏度為0.71 dL/g、酯環狀三聚物之含量為0.50重量%之聚酯(D)。 ＜聚酯(E)之製造方法＞ 相對於聚酯(C)100重量份，添加平均粒徑(d50)為2.3 μm之二氧化矽粒子0.03重量份並進行熔融混練，除此以外，使用與聚酯(D)之製造方法相同之方法而獲得聚酯(E)。關於所獲得之聚酯(E)，極限黏度為0.72 dL/g，酯環狀三聚物之含量為0.50重量%。 ＜聚酯(F)之製造方法＞ 相對於聚酯(C)100重量份，添加平均粒徑(d50)為0.3 μm之氧化鋁粒子1.5重量份並進行熔融混練，除此以外，使用與聚酯(D)之製造方法相同之方法而獲得聚酯(F)。關於所獲得之聚酯(F)，極限黏度為0.72 dL/g，酯環狀三聚物之含量為0.50重量%。 ＜聚酯(G)之製造方法＞ 相對於聚酯(C)100重量份，以成為10重量%濃度之方式添加作為紫外線吸收劑之2,2-(1,4-伸苯基)雙[4H-3,1-苯并㗁-4-酮]並進行熔融混練，除此以外，使用與聚酯(D)之製造方法相同之方法而獲得聚酯(G)。關於所獲得之聚酯(G)，極限黏度為0.72 dL/g，酯環狀三聚物之含量為0.52重量%。 ＜聚酯(H)之製造方法＞ 相對於聚酯(C)100重量份，以成為10重量%濃度之方式添加作為紫外線吸收劑之2,2'-亞甲基雙[6-(苯并***-2-基)-4-第三辛基苯酚]並進行熔融混練，除此以外，使用與聚酯(D)之製造方法相同之方法而獲得聚酯(H)。關於所獲得之聚酯(H)，極限黏度為0.72 dL/g，酯環狀三聚物之含量為0.52重量%。 《防靜電層及易接著層》 將防靜電層、易接著層中所使用之原料示於以下。又，將防靜電層、易接著層之塗佈液組成示於表2及表3。 (A1)：包含聚乙二氧基噻吩及聚苯乙烯磺酸之混合物(Starck股份有限公司製造之「BaytronPAG」) (A2)：以重量比率計以80/10/10之比率使下述式1-1之結構單元、下述式1-2之結構單元及下述式1-3之結構單元進行共聚合而成的數量平均分子量21000之高分子化合物 [化4](B1)：聚胺基甲酸酯樹脂 獲得包含對苯二甲酸664重量份、間苯二甲酸631重量份、1,4-丁二醇472重量份、新戊二醇447重量份之聚酯多元醇。繼而，於所獲得之聚酯多元醇中加入己二酸321重量份、二羥甲基丙酸268重量份，獲得含側羧基聚酯多元醇A。進而，於1880重量份之上述聚酯多元醇A中加入六亞甲基二異氰酸酯160重量份而獲得聚胺基甲酸酯樹脂水性塗料。 (B2)：以下述組成進行共聚合而成之聚酯樹脂之水分散體 單體組成：(酸成分)對苯二甲酸/間苯二甲酸/間苯二甲酸-5-磺酸鈉//(二醇成分)乙二醇/1,4-丁二醇/二乙二醇＝56/40/4/70/20/10(mol%) (B3)：以下述組成進行聚合而成之丙烯酸系樹脂之水分散體 丙烯酸乙酯/丙烯酸正丁酯/甲基丙烯酸甲酯/N-羥甲基丙烯醯胺/丙烯酸＝65/21/10/2/2(重量%)之乳化聚合物(乳化劑：陰離子系界面活性劑) (C1)：上述式(III)中n＝1之甘油 (C2)：上述式(III)中n＝2之聚甘油 (C3)：對上述式(III)中n＝2之聚甘油骨架之聚環氧丙烷加成物(平均分子量750) (D1)：環氧化合物：聚甘油聚縮水甘油醚 (D2)：作為㗁唑啉化合物之「Epocros」(日本觸媒股份有限公司製造，㗁唑啉基量7.7 mmol/g) (E1)：平均粒徑65 nm之矽溶膠 (F1)：硬化型聚矽氧樹脂：「KS-847H」(信越化學工業股份有限公司製造) (G1)：含鉑觸媒：「catPL-50T」(信越化學工業股份有限公司製造) [表2]
[表3]
實施例A1 (積層聚酯膜F1a之製造) 以聚酯(D)100重量%之原料作為表層A之原料，以分別以90重量%、10重量%之比率混合聚酯(D)、(F)而成之原料作為表層B之原料，以聚酯(C)100重量%之原料作為中間層之原料，供給至3台附排氣孔之擠出機，於290℃下進行熔融擠出後，使用靜電施加密接法，於將表面溫度設定為40℃之冷卻輥上進行冷卻固化而獲得厚度1500 μm之無定形膜。將上述膜於85℃下於縱向延伸3.4倍。 其次，以防靜電層及易接著層之厚度(乾燥後)分別成為0.06 g/m2
之方式，於表層A之上塗佈防靜電層用塗佈液1-1，於表層B之上塗佈易接著層用塗佈液2-1。其後，將膜導入至拉幅機，於100℃下於橫向延伸4.0倍，於230℃下進行熱處理後，於橫向進行2%之鬆弛處理，獲得厚度75 μm(厚度構成比：表層A/中間層/表層B＝6 μm/63 μm/6 μm)之積層聚酯膜F1a。 (表面保護膜之製造) 於積層聚酯膜F1a之易接著層之表面以厚度(乾燥後)成為25 μm之方式塗佈包含下述黏著層組合物之黏著層，於100℃下乾燥5分鐘，獲得表面保護膜。 《黏著層組合物》 藉由常規方法，於乙酸乙酯中使丙烯酸丁酯(100重量份)、丙烯酸(6重量份)進行共聚合而獲得重量平均分子量60萬(聚苯乙烯換算)之丙烯酸系共聚物之溶液(固形物成分30重量%)。相對於丙烯酸系共聚物100重量份(固形物成分)，添加丙烯酸N,N-二甲基胺基乙酯0.2重量份、作為環氧系交聯劑之「Tetrad C」(三菱瓦斯化學股份有限公司製造)6重量份而獲得黏著層組合物。 實施例A2～A6及A9～A23 (積層聚酯膜F2a～F6a及F9a～F23a之製造) 於積層聚酯膜F1a之製造方法中，如表4～5所示般變更聚酯之種類、以及防靜電層及易接著層之塗佈液組成，除此以外，以與積層聚酯膜F1a相同之方式進行製造，獲得積層聚酯膜F2a～F6a及F9a～F23a。 (表面保護膜之製造) 分別使用積層聚酯膜F2a～F6a或F9a～F23a代替積層聚酯膜F1a，除此以外，以與實施例A1相同之方式，獲得表面保護膜。 實施例A7及A8 (積層聚酯膜F7a及F8a之製造) 以與積層聚酯膜F1a相同之方式進行製造，獲得積層聚酯膜F7a。又，於積層聚酯膜F1a之製造方法中，如表4所示般變更易接著層之塗佈液組成，除此以外，以與積層聚酯膜F1a相同之方式進行製造，獲得積層聚酯膜F8a。 (表面保護膜之製造) 分別使用積層聚酯膜F7a或F8a代替積層聚酯膜F1a，且將黏著層之種類變更為聚矽氧黏著劑(東麗道康寧公司製造，「SD4580」)，除此以外，以與實施例A1相同之方式進行製造，獲得表面保護膜。 比較例A1 (積層聚酯膜F24a之製造) 於積層聚酯膜F1a之製造方法中，不設置防靜電層，除此以外，以與積層聚酯膜F1a相同之方式進行製造，獲得積層聚酯膜F24a。 (表面保護膜之製造) 使用積層聚酯膜F24a代替積層聚酯膜F1a，除此以外，以與實施例A1相同之方式，獲得表面保護膜。 比較例A2 (積層聚酯膜F25a之製造) 於積層聚酯膜F1a之製造方法中，如表6所示般變更聚酯之種類，除此以外，以與積層聚酯膜F1a相同之方式進行製造，獲得積層聚酯膜F25a。 (表面保護膜之製造) 使用積層聚酯膜F25a代替積層聚酯膜F1a，除此以外，以與實施例A1相同之方式，獲得表面保護膜。 比較例A3及A4 (積層聚酯膜F26a及F27a之製造) 於積層聚酯膜F1a之製造方法中，如表6所示般變更防靜電層之塗佈液組成，除此以外，以與積層聚酯膜F1a相同之方式進行製造，獲得積層聚酯膜F26a及F27a。 (表面保護膜之製造) 使用積層聚酯膜F26a或F27a代替積層聚酯膜F1a，除此以外，以與實施例A1相同之方式，獲得表面保護膜。 將上述實施例及比較例中所獲得之表面保護膜之特性示於下述表4～6。 [表4]
[表5]
[表6]
實施例B1 (積層聚酯膜F1b之製造) 以聚酯(D)100重量%原料作為表層A之原料，以分別以90重量%、10重量%之比率混合聚酯(D)、(F)而成之原料作為表層B之原料，以分別以50重量%、25重量%、25重量%之比率混合聚酯(C)、(G)、(H)而成之原料作為中間層之原料，供給至3台附排氣孔之擠出機，於290℃下進行熔融擠出後，使用靜電施加密接法，於將表面溫度設定為40℃之冷卻輥上進行冷卻固化而獲得厚度約1500 μm之無定形膜。將該膜於85℃下於縱向延伸3.4倍。 其次，以防靜電層及易接著層之厚度(乾燥後)分別成為0.06 g/m2
之方式，於表層A之上塗佈防靜電層用塗佈液1-1，於表層B之上塗佈易接著層用塗佈液2-1。其後，將膜導入至拉幅機，於100℃下於橫向延伸4.0倍，於230℃下進行熱處理後，於橫向進行2%之鬆弛處理，獲得厚度75 μm(厚度構成比：表層A/中間層/表層B＝6 μm/63 μm/6 μm)之積層聚酯膜F1b。 (表面保護膜之製造) 於積層聚酯膜F1b之易接著層之表面以厚度(乾燥後)成為25 μm之方式塗佈包含下述黏著層組合物之黏著層，於100℃下乾燥5分鐘，獲得表面保護膜。 《黏著層組合物》 藉由常規方法，於乙酸乙酯中使丙烯酸丁酯(100重量份)、丙烯酸(6重量份)進行共聚合而獲得重量平均分子量60萬(聚苯乙烯換算)之丙烯酸系共聚物之溶液(固形物成分30重量%)。相對於丙烯酸系共聚物100重量份(固形物成分)，添加丙烯酸N,N-二甲基胺基乙酯0.2重量份、作為環氧系交聯劑之「Tetrad C」(三菱瓦斯化學股份有限公司製造)6重量份而獲得黏著層組合物。 實施例B2～B6及B9～B28 (積層聚酯膜F2b～F6b及F9b～F28b之製造) 於積層聚酯膜F1b之製造方法中，如表7～9所示般變更聚酯之種類、以及防靜電層及易接著層之塗佈液組成，除此以外，以與積層聚酯膜F1b相同之方式進行製造，獲得積層聚酯膜F2b～F6b及F9b～F28b。 (表面保護膜之製造) 分別使用積層聚酯膜F2b～F6b或F9b～F28b代替積層聚酯膜F1b，除此以外，以與實施例B1相同之方式，獲得表面保護膜。 實施例B7及B8 (積層聚酯膜F7b及F8b之製造) 以與積層聚酯膜F1b相同之方式進行製造，獲得積層聚酯膜F7b。又，於積層聚酯膜F1b之製造方法中，如表7所示般變更易接著層之塗佈液組成，除此以外，以與積層聚酯膜F1b相同之方式進行製造，獲得積層聚酯膜F8b。 (表面保護膜之製造) 分別使用積層聚酯膜F7b或F8b代替積層聚酯膜F1b，且將黏著層之種類變更為聚矽氧黏著劑(東麗道康寧公司製造，「SD4580」)，除此以外，以與實施例B1相同之方式進行製造，獲得表面保護膜。 比較例B1 (積層聚酯膜F29b之製造) 於積層聚酯膜F1b之製造方法中，不設置防靜電層，除此以外，以與積層聚酯膜F1b相同之方式進行製造，獲得積層聚酯膜F29b。 (表面保護膜之製造) 使用積層聚酯膜F29b代替積層聚酯膜F1b，除此以外，以與實施例B1相同之方式，獲得表面保護膜。 比較例B2 (積層聚酯膜F30b之製造) 於積層聚酯膜F1b之製造方法中，如表10所示般變更聚酯之種類，除此以外，以與積層聚酯膜F1b相同之方式進行製造，獲得積層聚酯膜F30b。 (表面保護膜之製造) 使用積層聚酯膜F30b代替積層聚酯膜F1b，除此以外，以與實施例B1相同之方式，獲得表面保護膜。 比較例B3及B4 (積層聚酯膜F31b及F32b之製造) 於積層聚酯膜F1b之製造方法中，如表10所示般變更防靜電層之塗佈液組成，除此以外，以與積層聚酯膜F1b相同之方式進行製造，獲得積層聚酯膜F31b及F32b。 (表面保護膜之製造) 分別使用積層聚酯膜F31b或F32b代替積層聚酯膜F1b，除此以外，以與實施例B1相同之方式，獲得表面保護膜。 比較例B5 一併記載為先前技術。再者，於雷射加工評價中，表面保護膜本身不存在雷射光吸收功能，故而於切斷面附著微量之來自表面保護膜之異物。 將上述實施例及比較例中所獲得之表面保護膜之特性示於下述表7～10。 [表7]
[表8]
[表9]
[表10]
[產業上之可利用性] 本發明之積層聚酯膜例如可較佳地用於合成樹脂板、玻璃板、金屬板、光學構件、汽車構件、電氣或電子構件、建材用構件、文具或辦公用品構件等各種被黏著體之表面保護用。其中，於作為尤其必需高程度之視認性之光學構件之表面保護用，例如用於玻璃基板、光擴散膜、液晶顯示器(偏光板、相位差板、導光板、稜鏡板等)、觸控面板等之情形時，於貼合有表面保護膜之狀態下，容易進行伴隨光學評價之檢查，防靜電性良好，且具有雷射光吸收功能，故而能夠進行儘可能不存在來自表面保護膜之異物附著、或構件之毛邊產生之雷射加工(切斷、標記、修整、開孔等)，其工業價值較高。[Polyester film] The polyester film constituting the laminated polyester film of the present invention may have a single-layer structure or a laminated structure. The laminated structure may be, for example, two, three, four or more layers, and is not particularly limited. In a preferred embodiment of the present invention, the polyester film preferably has a laminated structure of at least 3 or more layers, more preferably 3 formed by sequentially laminating the outermost layer (surface layer A), the middle layer, and the outermost layer (surface layer B). Layer structure. The polyester used in the polyester film may be a homopolyester or a copolymerized polyester. When a homopolyester is included, it is preferable to obtain it by polycondensing an aromatic dicarboxylic acid and an aliphatic diol. Examples of the aromatic dicarboxylic acid include terephthalic acid and 2,6-naphthalenedicarboxylic acid. Examples of the aliphatic diol include ethylene glycol, diethylene glycol, and 1,4-cyclohexanedicarboxylic acid. Methanol and so on. Typical polyesters include polyethylene terephthalate (PET) and the like. On the other hand, examples of the dicarboxylic acid component of the copolymerized polyester include isophthalic acid, phthalic acid, terephthalic acid, 2,6-naphthalenedicarboxylic acid, adipic acid, and sebacic acid. One or two or more kinds of diol components include one or two of ethylene glycol, diethylene glycol, propylene glycol, butanediol, 1,4-cyclohexanedimethanol, neopentyl glycol, and the like. More than that. In any case, as the so-called polyester in the present invention, it is preferably polyethylene terephthalate, which is usually 60 mol% or more, and preferably 80 mol% or more. Polyester of polyester. As one of the specific methods for satisfying the present invention, it is preferred that the polyester constituting the outermost layer contains 80% by weight or more of an oligomer (ester cyclic terpolymer) content of 0.5% by weight or less. Thereby, a desired oligomer precipitation prevention effect can be obtained. By using a polyester having an oligomer content of 80% by weight or more and 0.5% by weight or less, it is possible to suppress a significant increase in haze after a heat treatment step. After processing, it is regarded as an optical property such as visibility As the optical member, a preferable polyester film is used. In the present invention, in terms of reducing the amount of oligomer in the film, it is preferred that the polyester film generally contains at least one compound selected from the group consisting of a titanium compound and a phosphorus compound. The titanium element content (Ti amount) in the polyester film is preferably 20 ppm or less, and more preferably 2 to 10 ppm. In the case where the amount of Ti exceeds 20 ppm, an oligomer is by-produced in the step of melt-extruding the polyester, and a film having a low oligomer and high transparency may not be obtained. In optical applications, it may be difficult to cope with applications where color tone is important. On the other hand, the phosphorus element content (P amount) in the polyester film is preferably 20 ppm or less, and more preferably 5 to 15 ppm. In the case where the amount of P exceeds 20 ppm, gelation occurs during the production of polyester, which becomes a foreign substance and degrades the quality of the film. For example, it is difficult to cope with an inspection step accompanied by optical evaluation. In the present invention, it is preferable to satisfy both the above-mentioned Ti amount and the above-mentioned P amount, whereby the significant effect of reducing the oligomer content in the polyester film can be exerted. The type of the titanium compound contained in the polyester film is not particularly limited, and more preferably a titanium-based polymerization catalyst typified by tetraisopropyl titanate and tetrabutyl titanate. The type of the phosphorus compound is not particularly limited, and more preferred are phosphoric acid esters represented by acidic phosphoric acid alkyl esters such as acidic ethyl phosphate, butyl phosphoric acid, and 2-ethylhexyl acid phosphoric acid. As for the outermost surface layer constituting the polyester film, the outermost surface layer (surface layer A) of the polyester film on the side in contact with the antistatic layer does not contain particles from the viewpoint that inspection with optical evaluation can be easily performed. Since the surface layer A does not contain particles, the surface of the polyester film can be sufficiently smoothed, so that the thickness of the following antistatic layer laminated thereon becomes uniform. Since the antistatic layer contains colored polythiophene or a polythiophene derivative, the difference in appearance of the laminated polyester film due to uneven thickness of the antistatic layer is suppressed. Therefore, the misidentification of foreign objects caused by the difference in shades is reduced. On the other hand, when the surface layer A contains particles, pores or defects are generated at the interface between the polyester film and the particles. These become opportunities for the oligomer to easily move to the surface of the polyester film. There is a possibility that oligomers are generated on the surface of the film. Therefore, since the surface layer A does not contain particles, the generation of oligomers can be suppressed. According to the above aspect, since the surface layer A does not contain particles, a laminated polyester film having good inspection properties can be obtained. In the present invention, the so-called "without particles" is defined as the surface layer A. For example, in the case of inorganic particles, when the inorganic elements are quantified by XRF (X-ray fluorescence) analysis, A particle content of 50 ppm or less, preferably 10 ppm or less, and most preferably the detection limit or less. In the case of organic particles, it is defined as that the infrared absorption spectrum of the above-mentioned surface layer A measured by infrared spectrometry does not show a peak different from that of the polyester raw material. The reason is that even if the surface layer A is deliberately free of particles, the possibility of foreign particles from the outside being taken into consideration during the manufacturing process is considered. In addition, in the other outermost layer (ie, the outermost layer of the polyester film on the opposite side to the antistatic layer; the surface layer B), the main purpose is to provide slippery properties, and it is preferable to mix particles. The type of the particles to be blended is not particularly limited as long as the particles can provide slip properties. Specific examples include silicon dioxide, calcium carbonate, magnesium carbonate, barium carbonate, calcium sulfate, calcium phosphate, magnesium phosphate, Particles such as kaolin, alumina, and titanium oxide. In addition, heat-resistant organic particles described in Japanese Patent Laid-Open No. Sho 59-5216, Japanese Patent Laid-Open No. Sho 59-217755, and the like can also be used. Examples of the other heat-resistant organic particles include a thermosetting urea resin, a thermosetting phenol resin, a thermosetting epoxy resin, and a benzoguanamine resin. Further, in the polyester production step, precipitated particles obtained by partially and finely dispersing a part of a metal compound such as a catalyst may be used. There is no particular limitation on the shape of the particles to be used, and any of a spherical shape, a block shape, a rod shape, and a flat shape can be used. The hardness, specific gravity, and color are not particularly limited. These series of particles can be used in combination of two or more kinds as required. The average particle diameter (d50) of the particles contained in the above-mentioned surface layer B is preferably 0.1 μm or more, more preferably 0.2 μm or more, and more preferably 3.0 μm in terms of being able to cope with the inspection step accompanying the optical evaluation. Hereinafter, it is more preferably 1.0 μm or less. When the average particle diameter is less than 0.1 μm, the film surface may be excessively flattened, and the film take-up property may be reduced. On the other hand, when the average particle diameter is more than 3.0 μm, there may be a problem in the inspection step accompanying the optical evaluation due to the presence of particles included in the film. Furthermore, the content of particles in the surface layer B is preferably 0.001% by weight or more, more preferably 0.01% by weight or more, more preferably 3% by weight or less, and even more preferably 2% by weight or less. When the particle content is less than 0.001% by weight, the slipperiness of the film may be insufficient. On the other hand, when it is added in excess of 3% by weight, the transparency of the film may be insufficient. Obstacles in the inspection steps of optical evaluation. The method for adding particles to the surface layer B is not particularly limited, and a conventionally known method can be adopted. For example, it can be added at any stage of manufacturing the polyester constituting each layer, and it is preferable that the polycondensation reaction can be performed at the esterification stage or after the transesterification reaction is completed. In addition, a method such as: using a kneading extruder with a vent hole, mixing a slurry of particles dispersed in ethylene glycol or water with a polyester raw material; or using a kneading extruder, The dried granules are mixed with the polyester material. In addition, in addition to the above-mentioned particles, a polyester film may be added with conventionally known antioxidants, antistatic agents, heat stabilizers, lubricants, dyes, pigments, and the like, as necessary. The polyester film preferably contains an ultraviolet absorber. When the polyester film has a three-layer structure in which the outermost layer (surface layer A), the intermediate layer, and the outermost layer (surface layer B) are sequentially laminated, it is preferable that the intermediate layer contains an ultraviolet absorber. Since the polyester film contains an ultraviolet absorber, it is possible to prevent surface protection as much as possible when laser processing (cutting, marking, trimming, opening, etc.) is performed while the surface protective film is bonded to the member. Film foreign matter adhesion, or laser processing caused by burrs of components. In particular, when the wavelength of the laser light is in the ultraviolet region (350 nm or less), it is possible to perform laser processing that efficiently utilizes thermal energy generated by ultraviolet absorption. In addition, during laser irradiation, the surface protective film itself can prevent excessive heat energy from being applied to the bonded members themselves. Therefore, for example, heat-sensitive electronic circuits can be protected from damage caused by laser irradiation. Electronic parts. Examples of the ultraviolet absorber to be used include organic ultraviolet absorbers and inorganic ultraviolet absorbers. In terms of transparency and ease of inclusion in polyesters, organic ultraviolet absorbers are preferably used. Examples of the organic ultraviolet absorber include salicylic acid-based compounds, such as phenyl salicylate, p-tert-butylphenyl salicylate, and p-octylphenyl salicylate. Examples of the compound include 2,2- (1,4-phenylene) bis [4H-3,1-benzofluoren-4-one]. Examples of the benzotriazole-based compound include 2,2 '-Methylenebis [6- (benzotriazol-2-yl) -4-third octylphenol]; Examples of the benzophenone-based compound include 2-hydroxy-4-benzyloxy Benzophenone, 2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-octyloxybenzophenone, 2-hydroxy-4-dodecyl Alkoxybenzophenone, 2,2'-dihydroxy-4-methoxybenzophenone, 2,2'-dihydroxy-4,4'-dimethoxybenzophenone, etc .; as Examples of the benzotriazole-based compound include 2- (2'-hydroxy-5'-third octylphenyl) -benzotriazole and 2- (2'-hydroxy-5'-third octyl Phenyl) -benzotriazole, 2- (2'-hydroxy-5'-methylphenyl) benzotriazole, 2- (2'-hydroxy-3 ', 5'-di-third-butyl Phenyl) benzotriazole, 2- (2'-hydroxy-3'-third butyl-5'-methylphenyl) -5-chlorobenzotri Azole, 2- (2'-hydroxy-3 ', 5'-di-tert-butylphenyl) 5-chlorobenzotriazole, etc. As natural compounds, for example, oryzanol, shea butter Fruit oil, saffron glycoside, and the like; examples of biological compounds include keratinocytes, melanin, and uric acid. These organic ultraviolet absorbers can be used singly or in combination of two or more kinds. Among them, the benzofluorene-based compound and the benzotriazole-based compound have good compatibility with the polyester film, the maximum absorption is below 350 nm, and the compounding amount in the film is a relatively small amount, 350 nm It is preferable that the ultraviolet absorption efficiency in the following ultraviolet region is improved. Examples of a method for blending an ultraviolet absorber into a polyester film include a method of directly adding an ultraviolet absorber to an extruder, a method of adding a polyester resin prepared by mixing an ultraviolet absorber in advance to the extruder, etc. Either method can be used, or two methods can be used together. The content of the ultraviolet absorber is preferably 0.5% by weight or more, more preferably 0.7% by weight or more, and more preferably 3.0% by weight or less, and more preferably 2.5% by weight based on the total amount of the polyester film. the following. When the content of the ultraviolet absorber in the film exceeds the above-mentioned upper limit, there are cases where the laser light absorption performance has become saturated. On the other hand, when the content of the ultraviolet absorber is lower than the above-mentioned lower limit, for example, as the laser light absorption efficiency decreases, the laser irradiation time becomes longer, and problems such as adhesion of foreign matter from the surface protective film may easily occur. . As the ultraviolet absorbent, it is preferable to use at least two kinds of ultraviolet absorbers in combination. For example, when the polyester film contains two kinds of ultraviolet absorbers, the content ratio of the ultraviolet absorbents with a large content to other ultraviolet absorbers is preferably 2: 1 to 10: 1, and more preferably 2: 1 to 8: 1. When the ratio of the ultraviolet absorbent with the largest content is larger than the above upper limit, there is a case where the concentration of the ultraviolet absorbent becomes too high and the wavelength selectivity of the ultraviolet absorbent is lacking. From the viewpoint of imparting a laser light absorption function, the light transmittance of the polyester film in the present invention having a wavelength of 350 nm or less is preferably 10% or less, and more preferably 7% or less. If the transmittance of light below 350 nm is greater than 10%, when used as a substrate for a surface protection film, the absorption efficiency of laser light is poor. For example, the longer the laser irradiation time, it is easy to produce the light from the surface protection film. The situation of foreign objects. Furthermore, as a laser used for processing a member covered with the surface protective film using the laminated polyester film of the present invention, a solid laser, a semiconductor laser, a liquid laser, a gas laser, or the like may be used. Laser. Of these, CO is preferred 2 Lasers, YAG (Yttrium Aluminium Garnet) lasers, from the viewpoint of preventing the generation of foreign matter from the surface protective film caused by laser irradiation, or the prevention of burrs in products after laser irradiation, Even better is a YAG laser. The thickness of the polyester film is not particularly limited as long as the thickness can be made into a film. For use, it is preferably 12 μm or more, more preferably 25 μm or more, and more preferably 250 μm or less, and more preferably 125 μm. the following. When the polyester film has a three-layer structure in which the outermost layer (surface layer A), the middle layer, and the outermost layer (surface layer B) are sequentially laminated, the thickness of the surface layer A is preferably 1 μm or more, and more preferably 2 μm. The above is more preferably 3 μm or more, more preferably 50 μm or less, more preferably 30 μm or less, and still more preferably 20 μm or less. When the thickness of the surface layer A is within the above range, the surface of the polyester film can be sufficiently smoothed. The thickness of the surface layer B is not particularly limited, but is preferably 1 μm or more, more preferably 2 μm or more, still more preferably 3 μm or more, and further preferably 50 μm or less, more preferably 30 μm or less, and further It is preferably 20 μm or less. When the thickness of the surface layer B is in the above-mentioned range, sufficient slipperiness can be obtained. Next, although the manufacturing example of the polyester film which comprises the laminated polyester film of this invention is demonstrated concretely, it is not limited at all by the following manufacturing examples. In addition, the following manufacturing examples are manufacturing examples of a biaxially stretched film, but the polyester film in the present invention is not limited to a biaxially stretched film, and may be a uniaxially stretched film or an unstretched film. Preferably, the method is as follows: first, using the polyester raw material described above, the molten sheet extruded from the die is cooled and solidified using a cooling roller to obtain an unstretched sheet. In this case, in order to improve the flatness of the sheet, it is necessary to improve the adhesion between the sheet and the rotary cooling drum, and it is preferable to adopt an electrostatic application adhesion method and / or a liquid coating adhesion method. Next, the obtained unstretched sheet is stretched in a biaxial direction. In this case, the unstretched sheet is first stretched in one direction by a roll or tenter-type stretcher. The stretching temperature is usually 70 to 120 ° C, preferably 80 to 110 ° C, and the stretching ratio is usually 2.5 to 7.0 times, preferably 3.0 to 6.0 times. Then, the extension temperature orthogonal to the extension direction of the first stage is usually 70 to 170 ° C, and the extension ratio is usually 3.0 to 7.0 times, preferably 3.5 to 6.0 times. Then, heat treatment is continued at a temperature of 180 to 270 ° C. under stretching or relaxation within 30% to obtain a biaxial alignment film. The above-mentioned extension can also adopt a method of extending in one direction in more than two stages. In this case, it is preferable to carry out so that the extension magnification of the last two directions may become the said range, respectively. For the production of a polyester film, a simultaneous biaxial stretching method may be adopted. As for the simultaneous biaxial extension device, a previously known extension method such as a spiral method, a zoom method, and a linear drive method may be adopted. Furthermore, a so-called coating and stretching method (in-line coating) for treating the surface of the film in the stretching step of the polyester film may be performed. When a coating layer (for example, an antistatic layer) is provided on a polyester film by a coating stretching method, it becomes possible to perform coating while stretching, and to reduce the thickness of the coating layer according to the stretching ratio. Therefore, a film suitable as a polyester film can be manufactured. [Antistatic layer (coating layer 1)] The laminated polyester film of the present invention has an antistatic layer (coating layer 1) on at least one side of the polyester film. When the polyester film has a three-layer structure in which the outermost layer (surface layer A), the middle layer, and the outermost layer (surface layer B) are sequentially laminated, an antistatic layer is provided on the surface layer A in the polyester film. Regarding the antistatic layer constituting the laminated polyester film, as a constituent member of the surface protective film, in order to improve the antistatic property, polythiophene or a polythiophene derivative is contained as an antistatic agent, and preferably a binder polymer is further contained. By using polythiophene or a polythiophene derivative as the antistatic layer, higher conductivity can be obtained. Furthermore, the polyester film may cause color unevenness (rain unevenness) such as rainbow due to retardation. In the laminated polyester film of the present invention, by using colored polythiophene or a polythiophene derivative, rainbow unevenness can be suppressed, and misidentification caused by rainbow unevenness can be suppressed by foreign matter inspection. In addition, the antistatic layer may contain other components within a range that does not detract from the gist of the present invention. Examples of the polythiophene derivative include compounds having a functional group bonded to the 3rd and 4th positions of the thiophene ring. The compound represented by the following formula (I) in which an oxygen atom is bonded to a carbon atom at the 3 and 4 positions is preferred. [Chemical 1] In the above formula (I), R 1 , R 2 Each independently represents a hydrogen element, an aliphatic chain hydrocarbon group having 1 to 12 carbon atoms, an alicyclic hydrocarbon group or an aromatic hydrocarbon group, and is, for example, methyl, ethyl, propyl, isopropyl, butyl, cyclohexyl, benzene Base etc. In the antistatic layer of the laminated polyester film, a polythiophene derivative represented by the following formula (II) can be used as an antistatic agent. For example, a compound of n = 1 (methylene), n = 2 (ethylene), and n = 3 (propyl) in the following formula (II) is preferred. Among them, particularly preferred is an ethylidene compound having n = 2, that is, poly-3,4-ethylenedioxythiophene. [Chemical 2] In the formula (II), n is an integer of 1 to 4. It is more preferable that the antistatic layer contains a composition containing the polythiophene and a polyanion, or a composition containing the polythiophene derivative and a polyanion. The polyanion means "an acidic polymer in a free acid state", and is preferably a high-molecular carboxylic acid or a high-molecular sulfonic acid. Specific examples of the polymer carboxylic acid include polyacrylic acid, polymethacrylic acid, and polymaleic acid. Specific examples of the polymer sulfonic acid include polystyrene sulfonic acid and polyethylene sulfonic acid. Among them, polystyrenesulfonic acid is most preferable in terms of conductivity. Furthermore, a part of the free acid may be used in the form of a neutralized salt. It is considered that during the polymerization of polythiophene or polythiophene derivatives, by using such polyanions, it is easy to disperse or water-generate a polythiophene-based compound that is originally insoluble in water, and also to function as an acid as a polythiophene. The function of the dopant of the compound. In addition, the polymer carboxylic acid or polymer sulfonic acid may be used in the form of copolymerization with other monomers capable of copolymerization, such as acrylate, methacrylate, styrene, and the like. The molecular weight of the polymer carboxylic acid or polymer sulfonic acid used as the polyanion is not particularly limited. In terms of the stability or conductivity of the coating agent, the weight average molecular weight is preferably 1,000 to 1,000,000, and more preferably 5000. ~ 150000. An alkali metal salt, an ammonium salt, etc. may be included in a range which does not inhibit the characteristic of this invention. It can be seen that in the case of a neutralized salt, the polystyrene sulfonic acid and ammonium salt that function as very strong acids also lose their balance on the acid side due to the equilibrium reaction after neutralization. It functions as a dopant. In terms of conductivity, the polyanion is preferably present in an excess amount based on the weight ratio of the solid component relative to the polythiophene or polythiophene derivative, and the polyanion is 1 part by weight of the polythiophene or polythiophene derivative. It is preferably 0.5 to 5 parts by weight, more preferably 1 to 5 parts by weight, and even more preferably 1 to 3 parts by weight. The composition containing the above polythiophene or polythiophene derivative and polyanion is disclosed in, for example, Japanese Patent Laid-Open No. 6-295016, Japanese Patent Laid-Open No. 7-292081, Japanese Patent Laid-Open No. 1-313521, Examples are described in Japanese Patent Laid-Open No. 2000-6324, European Patent EP602731, and US Patent No. 5,391,472. However, methods other than these may be used. As an example, an alkali metal salt of 3,4-dihydroxythiophene-2,5-dicarboxylic acid ester is used as a starting material to obtain 3,4-ethylenedioxythiophene, and then in an aqueous solution of polystyrenesulfonic acid Potassium peroxydisulfate, ferric sulfate, and 3,4-ethylenedioxythiophene obtained previously are introduced into the reaction, and polyanions such as polystyrenesulfonic acid and poly (3,4-ethylenedioxythiophene) are obtained. And other polythiophene complexes. Regarding the composition containing the above-mentioned polythiophene and polyanion, or the composition containing the above-mentioned polythiophene derivative and polyanion, for example, in "The Latest Trend of Conductive Polymer Technology" (issued by Toray Research Center Co., Ltd., 1999 (June 1st, 1st printing). The binder polymer that can constitute the antistatic layer is defined as a “GPC” measurement laboratory based on the “Safety Evaluation Flowchart of Polymer Compounds” (sponsored by the Chemical Substances Council). A polymer compound having a number average molecular weight (Mn) of 1,000 or more and having film-forming properties. However, the above polyanions are excluded. The binder polymer may be a thermosetting resin or a thermoplastic resin as long as it is compatible with or mixed with polythiophene or a polythiophene derivative. Examples include polyester resins such as polyethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate; and polyimides such as polyimide and polyimide Resin; Polyamide resins such as polyamide 6, polyamide 6, 6, polyamide 12, and polyamide 11; polyvinylidene fluoride, polyvinyl fluoride, polytetrafluoroethylene, and ethylene tetrafluoroethylene Copolymer, fluororesin such as polychlorotrifluoroethylene; polyvinyl alcohol, polyvinyl ether, polyvinyl butyral, polyvinyl acetate, polyvinyl chloride and other vinyl resin; epoxy resin; oxetane resin Xylene resin; Aromatic polyamidoresin; Polyamidopolysiloxane resin; Polyurethane resin; Polyurea resin; Melamine resin; Phenol resin; Polyether resin; Acrylic resin and others Copolymers, etc. These adhesive polymers can be dissolved in an organic solvent, or can be made into an aqueous solution by imparting a functional group such as a sulfo group or a carboxyl group. In addition, in the binder polymer, a hardening agent such as a crosslinking agent and a polymerization initiator, a polymerization accelerator, a solvent, a viscosity modifier, and the like may be used in combination as necessary. Among the above-mentioned adhesive polymers, in terms of easy mixing when preparing a coating liquid, any one or more selected from polyester resins, acrylic resins, and polyurethane resins is preferred. Among these, a polyurethane resin is preferable. The polyester resin is defined as a linear polyester having a dicarboxylic acid component and a diol component as constituent components. Examples of the dicarboxylic acid component include terephthalic acid, isophthalic acid, phthalic acid, 2,6-naphthalenedicarboxylic acid, 4,4-diphenyldicarboxylic acid, and 1,4-cyclohexane. Dicarboxylic acid, adipic acid, sebacic acid, phenylindane dicarboxylic acid, dimer acid, and the like. These ingredients can be used in two or more kinds. Further, together with these components, unsaturated polybasic acids such as maleic acid, fumaric acid, iconic acid, etc., or p-hydroxybenzoic acid, p- (β-hydroxyethoxylate) can be used. Hydroxycarboxylic acids such as benzoic acid. The ratio of the unsaturated polybasic acid component or the hydroxycarboxylic acid component is preferably 10 mol% or less, and more preferably 5 mol% or less. Examples of the diol component include ethylene glycol, 1,4-butanediol, neopentyl glycol, diethylene glycol, dipropylene glycol, 1,6-hexanediol, and 1,4-cyclohexane. Dimethanol, benzyl alcohol, dimethylolpropionic acid, glycerol, trimethylolpropane, poly (ethyleneoxy) glycol, poly (tetramethyleneoxy) glycol, alkylene oxide of bisphenol A Adducts, alkylene oxide adducts of hydrogenated bisphenol A, and the like. These can be used in more than two types. Among such glycol components, ethylene glycol, an ethylene oxide adduct or propylene oxide adduct of bisphenol A, 1,4-butanediol, and further preferably ethylene glycol, Ethylene oxide adduct or propylene oxide adduct of bisphenol A. Moreover, in order to facilitate aqueous liquefaction, it is preferable that a small amount of a compound having a sulfonate group or a compound having a carboxylate group be copolymerized with the polyester resin. Preferred examples of the compound having a sulfonate group include sodium isophthalate-5-sulfonate, ammonium isophthalate-5-sulfonate, sodium isophthalate-4-sulfonate, 4-methylammonium sulfoisophthalate, sodium 2-sulfonate isophthalate, potassium 5-sulfonate isophthalate, potassium 4-sulfonate isophthalate, isophthalic acid 2-sulfonic acid alkali metal salt-based compounds such as potassium sulfonate and sodium sulfosuccinate or sulfonate-based compounds and the like. The acrylic resin is a polymer containing a polymerizable monomer containing acrylic and methacrylic monomers. It may be either a homopolymer or a copolymer. In addition, not only copolymers having a polymerizable monomer having a carbon-carbon double bond different from the polymerizable monomers described above, but also these polymers and other polymers (e.g., polyester, polyurethane, etc.) ). Examples are block copolymers and graft copolymers. Furthermore, a polymer obtained by polymerizing a polymerizable monomer having a carbon-carbon double bond in a polyester solution or a polyester dispersion (in some cases, a polymer mixture) is also included. Also included is a polymer obtained by polymerizing a polymerizable monomer having a carbon-carbon double bond in a polyurethane solution or a polyurethane dispersion (a polymer mixture, as the case may be). Also included is a polymer obtained by polymerizing a polymerizable monomer having a carbon-carbon double bond in another polymer solution or dispersion (a polymer mixture, as the case may be). The polymerizable monomer having a carbon-carbon double bond is not particularly limited, and typical compounds include acrylic acid, methacrylic acid, butenoic acid, itaconic acid, fumaric acid, and maleic acid. , Various maleic acid-containing monomers such as methyl maleic acid, and salts thereof; 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, (meth) Various hydroxy-containing monomers such as 4-hydroxybutyl acrylate, fumarate monobutyl hydroxy ester, and monoconic hydroxy ester of iconate; methyl (meth) acrylate, ethyl (meth) acrylate Esters, propyl (meth) acrylate, butyl (meth) acrylate, lauryl (meth) acrylate and other (meth) acrylates; (meth) acrylamide, diacetoneacrylamide And various nitrogen-containing vinyl monomers such as N-methylol acrylamide and (meth) acrylonitrile. In addition, a polymerizable monomer as described below can be copolymerized in combination with these. That is, various styrene derivatives such as styrene, α-methylstyrene, divinylbenzene, and vinyltoluene; various vinyl esters such as vinyl acetate and vinyl propionate; and γ- Various silicon-containing polymerizable monomers such as methacryloxypropyltrimethoxysilane, vinyltrimethoxysilane, methacrylfluorenyl silicon macromonomer, etc .; phosphorus-containing vinyl monomers Types; vinyl chloride, vinylidene chloride, vinylidene fluoride, vinylidene fluoride, trifluorochloroethylene, tetrafluoroethylene, chlorotrifluoroethylene, hexafluoropropylene and other various halogenated vinyls; butadiene and other various Conjugated diene and so on. In the acrylic resin, the glass transition temperature (hereinafter, sometimes simply referred to as Tg) is preferably 40 ° C or higher, and more preferably 60 ° C or higher. When the Tg is less than 40 ° C, when the coating thickness of the coating layer is made thicker to improve the adhesiveness, defects such as easy adhesion may occur. Polyurethane resin refers to a polymer compound having a urethane bond in the molecule. Among these, when considering the adaptability to in-line coating, a water-dispersible or water-soluble polyurethane resin is preferred. In order to impart water dispersibility or water solubility, a hydrophilic group such as a hydroxyl group, a carboxyl group, a sulfonic acid group, a sulfofluorenyl group, a phosphate group, or an ether group may be introduced into the polyurethane resin. Among the above-mentioned hydrophilic groups, a carboxylic acid group or a sulfonic acid group is preferably used from the viewpoint of improvement in coating film physical properties and adhesion. As a specific manufacturing example of a polyurethane resin, the method using the reaction of a hydroxyl group and an isocyanate is mentioned, for example. As the hydroxyl group used as a raw material, a polyol is preferably used, and examples thereof include polyether polyols, polyester polyols, polycarbonate polyols, polyolefin polyols, and acrylic polyols. These compounds may be used alone or in combination. Examples of the polyether polyols include polyethylene glycol, polypropylene glycol, ethylene glycol-propylene glycol copolymer, polytetramethylene ether glycol, and polyhexamethylene ether glycol. Examples of the polyester polyols include polycarboxylic acids (malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, sebacic acid, fumaric acid, and maleic acid). Glycolic acid, terephthalic acid, isophthalic acid, etc.) or their anhydrides and polyols (ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, dipropylene glycol, tripropylene glycol, butanediol, 1,3-butanediol, 1,4-butanediol, 2,3-butanediol, 2-methyl-1,3-propanediol, 1,5-pentanediol, neopentyl glycol, 1, 6-hexanediol, 3-methyl-1,5-pentanediol, 2-methyl-2,4-pentanediol, 2-methyl-2-propyl-1,3-propanediol, 1, 8-octanediol, 2,2,4-trimethyl-1,3-pentanediol, 2-ethyl-1,3-hexanediol, 2,5-dimethyl-2,5-hexane Diol, 1,9-nonanediol, 2-methyl-1,8-octanediol, 2-butyl-2-ethyl-1,3-propanediol, 2-butyl-2-hexyl-1 , 3-propanediol, cyclohexanediol, bis (hydroxymethyl) cyclohexane, dimethanolbenzene, bis (hydroxyethoxy) benzene, alkyldialkanolamine, lactone glycol, etc.) By. Examples of the polycarbonate-based polyols include polycarbonate diols obtained by a dealcoholization reaction from polyols and dimethyl carbonate, diethyl carbonate, diphenyl carbonate, ethylene carbonate, and the like. For example, poly (1,6-hexyl) carbonate, poly (3-methyl-1,5-pentyl) carbonate, and the like. Examples of the polyisocyanate compound used to obtain the polyurethane resin include toluene diisocyanate, xylylene diisocyanate, methylene diphenyl diisocyanate, benzene diisocyanate, naphthalene diisocyanate, and toluidine. Aromatic diisocyanates such as diisocyanate; aliphatic diisocyanates with aromatic rings such as α, α, α ', α'-tetramethylxylylene diisocyanate, methylene diisocyanate, propylene diisocyanate, lysine Aliphatic diisocyanates such as diisocyanate, trimethylhexamethylene diisocyanate, hexamethylene diisocyanate; cyclohexane diisocyanate, methylcyclohexane diisocyanate, isophorone diisocyanate, dicyclohexylmethane Alicyclic diisocyanates such as diisocyanate and isopropylidene dicyclohexyl diisocyanate. These can be used alone or in combination. When synthesizing a polyurethane resin, a conventionally known chain extender can be used. As the chain extender, there is no particular limitation as long as it has two or more reactive groups reactive with isocyanate groups, and is widely used. Chain extender with 2 hydroxyl or amine groups. Examples of the chain extender having two hydroxyl groups include, for example, aliphatic diols such as ethylene glycol, propylene glycol, and butanediol; and aromatic two such as benzyl alcohol and bis (hydroxyethoxy) benzene. Alcohols; diols such as ester diols such as neopentyl glycol hydroxyvalerate. Examples of the chain extender having two amine groups include aromatic diamines such as toluenediamine, xylylenediamine, and diphenylmethyldiamine; ethylenediamine, propylenediamine, hexamethylenediamine, and the like. 2,2-dimethyl-1,3-propanediamine, 2-methyl-1,5-pentanediamine, trimethylhexanediamine, 2-butyl-2-ethyl-1,5- Aliphatic diamines such as pentanediamine, 1,8-octanediamine, 1,9-nonanediamine, 1,10-decanediamine; 1-amino-3-aminomethyl-3,5,5 -Trimethylcyclohexane, dicyclohexylmethyldiamine, isopropylidenecyclohexyl-4,4'-diamine, 1,4-diaminocyclohexane, 1,3-bis (aminomethyl) Group) cycloaliphatic diamines such as cyclohexane and the like. The blending ratio of the binder polymer in the antistatic layer is in the range of 10 to 80% by weight, and more preferably in the range of 20 to 60% by weight. When the range is less than 10% by weight, the adhesion to the polyester film may be reduced. On the other hand, when it exceeds 80% by weight, there may be cases where the bonding performance becomes saturated, and a significant effect cannot be obtained by an increase of more. In order to coat the antistatic layer on the polyester film, it is preferable that the coating solution for the antistatic layer contains an alkylene oxide selected from glycerin (C1), polyglycerol (C2), and glycerol or polyglycerol. One or more compounds or derivatives thereof in the group composed of the product (C3), so that the coating properties are good. Glycerin and polyglycerin are compounds represented by the following formula (III). [Chemical 3] In the above formula (III), the compound where n = 1 is glycerol, and the compound where n is 2 or more is polyglycerin. In the present invention, n in the formula (III) is preferably in a range of 1 to 20, and more preferably in a range of 2 to 20. Among these, polyglycerol is more preferable from the viewpoint of the transparency of the antistatic layer. The alkylene oxide adduct of glycerol or polyglycerol has a structure obtained by polymerizing an alkylene oxide or a derivative thereof with the hydroxyl group of glycerol or polyglycerol represented by formula (III). Here, the structure of the alkylene oxide or its derivative added to each hydroxyl group of the glycerol or polyglycerol skeleton may be different. In addition, as long as at least one hydroxyl group in the molecule is added, it is not necessary to add alkylene oxide or a derivative thereof to all the hydroxyl groups. As the alkylene oxide or a derivative thereof, a structure including an ethylene oxide or propylene oxide skeleton is preferable. If the alkyl chain in the alkylene oxide structure becomes too long, the hydrophobicity becomes stronger, the uniform dispersibility in the coating solution becomes worse, and the antistatic property or transparency of the coating film tends to become worse. Particularly preferred is ethylene oxide. In such an alkylene oxide adduct of glycerol or polyglycerol, the copolymerization ratio of alkylene oxide or its derivative with respect to the glycerol or polyglycerol backbone is not particularly limited. When the glycerol portion is set to 1, the alkylene oxide portion is preferably 20 or less, and more preferably 10 or less. When the ratio of the alkylene oxide or its derivative to the glycerol or polyglycerol skeleton is larger than this range, the characteristics close to the case of using a normal polyalkylene oxide may be obtained, and the required performance may not be obtained. As a particularly preferred embodiment of the compound of the present invention, polyglycerol (C2) and an alkylene oxide adduct (C3) to glycerol or polyglycerol can be exemplified. The polyglycerin (C2) is particularly preferably a compound in which n is 2 to 20 among the compounds of the formula (III). In addition, as the alkylene oxide adduct (C3) to glycerol or polyglycerin, it is particularly preferable to add ethylene oxide and / or polyethylene oxide to a compound of n = 2 in the compound of the formula (III). In the formed structure, the number of additions is particularly preferably in the range of 300 to 2,000 based on the weight average molecular weight of the final compound (C3). The weight of the polythiophene or polythiophene derivative in the antistatic layer constituting the laminated polyester film is preferably 0.5 mg / m 2 Above, more preferably 1 mg / m 2 the above. By setting the weight to 0.5 mg / m 2 The above can have sufficient antistatic properties. On the other hand, the upper limit is not particularly limited, but it is preferably 100 mg / m 2 Below, more preferably 50 mg / m 2 the following. The weight ratio of the polythiophene or polythiophene derivative in 100% by weight of the antistatic layer is not limited. The upper limit is preferably 90% by weight or less, more preferably 80% by weight or less, and most preferably 60% by weight. % By weight or less. When the weight ratio exceeds 90% by weight, the transparency of the coating film may be insufficient. On the other hand, the lower limit is preferably 1% or more, and more preferably 2% by weight or more. When the weight ratio is less than 1% by weight, the antistatic performance may be insufficient. In the antistatic layer, the ratio of the polythiophene or the polythiophene derivative to the binder polymer is preferably in the range of 90/10 to 1/99 in terms of weight ratio. The range is more preferably 70/30 to 1/99, and most preferably 50/50 to 10/90. When it deviates from this range, the antistatic performance or the appearance of the coating film tends to deteriorate. If the appearance of the coating film is deteriorated, there may be a difference in the appearance of the laminated polyester film, that is, color unevenness, which may cause misidentification of foreign matter during inspection, which is not good. The antistatic layer (coating layer 1) in the present invention may contain a defoamer, a coating improver, a tackifier, an organic lubricant, a release agent, organic particles, inorganic particles, an antioxidant, UV absorber, foaming agent, dye, pigment and other additives. These additives can be used singly or in combination of two or more kinds as required. In addition, if the structure contains (poly) alkylene oxide, (poly) glycerin, or a derivative thereof as the additives, the antistatic property of the obtained antistatic layer is not hindered, which is more preferable. In terms of operability, working environment, and stability of the coating liquid composition, the coating liquid forming the antistatic layer (coating layer 1) in the present invention is preferably an aqueous solution or a water dispersion. As long as water is the main medium and does not exceed the scope of the gist of the present invention, it may contain an organic solvent. The antistatic layer in the present invention is preferably provided by applying a coating solution containing a specific compound to a polyester film, and in the present invention, it is particularly preferable to perform the coating by forming a polyester film. It is provided by in-line coating. The inherent resistance value R of the surface of the antistatic layer of the laminated polyester film is preferably 1 × 10 9 Ω or less. R is more preferably 1 × 10 8 Ω or less, further preferably 1 × 10 7 Ω or less. By setting R to 1 × 10 9 Ω or less can prevent defects such as entrainment of foreign matter during peeling of the laminated polyester film when used as a surface protection film. [Easy adhesion layer (coating layer 2)] It is preferable to have an antistatic layer on one side of the polyester film, and to provide an easy adhesion layer on the side opposite to the antistatic layer (application layer 2) To improve the adhesion to the adhesive layer. When the polyester film has a three-layer structure in which the outermost surface layer (surface layer A), the intermediate layer, and the outermost surface layer (surface layer B) are sequentially laminated, it is preferable that the polyester film has a surface layer B on the polyester film. Next layer. As a specific component, it is preferable to contain a binder polymer and a crosslinking agent in an easy adhesion layer. The binder polymer constituting the easily-adhesive layer is not particularly limited, and the same one as the binder polymer in the antistatic layer may be used. Among these, as a more preferable binder polymer, polyester resin is mentioned. In the polyester resin constituting the easy-adhesion layer, the glass transition temperature (hereinafter, sometimes simply referred to as Tg) is preferably 40 ° C or higher, and more preferably 60 ° C or higher. When the Tg is less than 40 ° C, when the coating thickness of the easy-adhesion layer is made thicker to improve the adhesion, there may be cases such as easy adhesion. In addition, in the formation of the easy-adhesive layer, in order to improve the coating appearance, or to improve the adhesiveness when an adhesive layer is formed on the easy-adhesive layer, it is also possible to use other than polyester resins within the range that does not damage the gist of the present invention. polymer. Specific examples of the polymer include an acrylic resin, a polyurethane resin, a polyvinyl resin (such as polyvinyl alcohol), a polyalkylene glycol, a polyalkyleneimine, and a methyl group. Cellulose, hydroxycellulose, starches, etc. Among these, it is preferable to use an acrylic resin or a polyurethane resin from the viewpoint of improving the adhesiveness. As the cross-linking agent constituting the easy-adhesion layer, various known cross-linking agents can be used, and examples thereof include an oxazoline compound, a melamine compound, an epoxy compound, an isocyanate-based compound, a carbodiimide-based compound, and a silane coupling compound. Among these, especially when it is used for the purpose of providing a functional layer (for example, an adhesive layer) on an easy adhesion layer, it is preferable to use an oxazoline compound from a viewpoint of improving durable adhesiveness. The oxazoline compound is a compound having an oxazoline group in the molecule, and is particularly preferably a polymer containing an oxazoline group. It can be produced by addition of a polymerizable oxazoline group-containing monomer alone, or by It is made by polymerizing other monomers. Examples of the addition polymerizable oxazoline group-containing monomer include 2-vinyl-2-oxazoline, 2-vinyl-4-methyl-2-oxazoline, and 2-vinyl-5-methyl -2-oxazoline, 2-isopropenyl-2-oxazoline, 2-isopropenyl-4-methyl-2-oxazoline, 2-isopropenyl-5-ethyl-2-fluorene For oxazoline, etc., one kind or a mixture of two or more kinds can be used. Among these, 2-isopropenyl-2-oxazoline is also easily industrially available, and is therefore preferred. The other monomer is not limited as long as it is a monomer that can be copolymerized with the addition polymerizable oxazoline group-containing monomer, and examples thereof include alkyl (meth) acrylate (as an alkyl group, methyl, (Meth) acrylates such as ethyl, n-propyl, isopropyl, n-butyl, isobutyl, third butyl, 2-ethylhexyl, cyclohexyl); acrylic acid, methacrylic acid, Ikon Acid, maleic acid, fumaric acid, butenoic acid, styrene sulfonic acid and its salts (sodium, potassium, ammonium, tertiary amine, etc.) and other unsaturated carboxylic acids; acrylonitrile, Unsaturated nitriles such as methacrylonitrile; (meth) acrylamide, N-alkyl (meth) acrylamide, N, N-dialkyl (meth) acrylamide (as alkyl, is Methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tertiary butyl, 2-ethylhexyl, cyclohexyl, etc.) unsaturated ethylamines; vinyl acetate, propionic acid Vinyl esters such as vinyl esters; Vinyl ethers such as methyl vinyl ether and ethyl vinyl ether; α-olefins such as ethylene and propylene; halogen-containing α, β-unsaturated monomers such as vinyl chloride, vinylidene chloride, and vinyl fluoride Body type; styrene α- methylstyrene α, β- unsaturated aromatic monomer, one kind or more of these or the two kinds of monomers may be used. The amount of the oxazoline group of the oxazoline compound is preferably 0.5 mmol / g or more, more preferably 3 mmol / g or more, still more preferably 5 mmol / g or more, and still more preferably 10 mmol / g or less, more It is preferably 9 mmol / g or less, and further preferably 8 mmol / g or less. By using within the above range, the durability of the coating film is improved. The melamine compound is a compound having a melamine structure in the compound, and for example, a hydroxyalkylated melamine derivative, a compound in which an alcohol and a hydroxyalkylated melamine derivative are partially or completely etherified by reaction, and a mixture thereof can be used. As the alcohol used in the etherification, methanol, ethanol, isopropanol, n-butanol, isobutanol and the like are preferably used. In addition, as the melamine compound, any one of a monomer and a dimer or more may be used, or a mixture of these may be used. Furthermore, a product obtained by co-condensing a part of melamine and the like with melamine may be used, and a catalyst may be used in order to improve the reactivity of the melamine compound. The epoxy compound is a compound having an epoxy group in the molecule, and examples thereof include condensates of epichlorohydrin and hydroxyl or amine groups of ethylene glycol, polyethylene glycol, glycerol, polyglycerin, bisphenol A, and the like. Polyepoxy compounds, diepoxy compounds, monoepoxy compounds, glycidylamine compounds, and the like. Examples of the polyepoxide include sorbitol polyglycidyl ether, polyglycerol polyglycidyl ether, pentaerythritol polyglycidyl ether, diglycerol polyglycidyl ether, and triglycidyl tri (2-hydroxyethyl) isocyanate. , Glycerol polyglycidyl ether, trimethylolpropane polyglycidyl ether; examples of diepoxy compounds include neopentyl glycol diglycidyl ether, 1,6-hexanediol diglycidyl ether, m-benzene Diphenol diglycidyl ether, ethylene glycol diglycidyl ether, polyethylene glycol diglycidyl ether, propylene glycol diglycidyl ether, polypropylene glycol diglycidyl ether, polytetramethylene glycol diglycidyl ether; as Examples of the monoepoxy compound include allyl glycidyl ether, 2-ethylhexyl glycidyl ether, and phenyl glycidyl ether. Examples of the glycidylamine compound include: N, N, N ', N'- Tetraglycidyl-m-xylylenediamine, 1,3-bis (N, N-diglycidylamino) cyclohexane and the like. The isocyanate-based compound is a compound having an isocyanate derivative structure represented by an isocyanate or a block isocyanate. Examples of the isocyanate include aromatic isocyanates such as toluene diisocyanate, xylylene diisocyanate, methylene diphenyl diisocyanate, benzene diisocyanate, and naphthalene diisocyanate; α, α, α ', α'-tetra Aliphatic isocyanates with aromatic rings such as methylxylylene diisocyanate, methylene diisocyanate, propylene diisocyanate, lysine diisocyanate, trimethylhexamethylene diisocyanate, hexamethylene diisocyanate, etc. Aliphatic isocyanate; cycloaliphatic diisocyanate, methylcyclohexane diisocyanate, isophorone diisocyanate, methylene bis (4-cyclohexyl isocyanate), isopropylidene dicyclohexyl diisocyanate and other alicyclic Isocyanate, etc. The carbodiimide-based compound is a compound having a carbodiimide structure, and is a compound having one or more carbodiimide structures in a molecule. In order to obtain better adhesion, etc., it is more preferable for the molecule It has two or more polycarbodiimide compounds. The carbodiimide-based compound can be synthesized by a conventionally known technique, and a condensation reaction of a diisocyanate compound is generally used. The diisocyanate compound is not particularly limited, and any of aromatic and aliphatic systems may be used. Specific examples include toluene diisocyanate, xylylene diisocyanate, diphenylmethane diisocyanate, and benzene. Diisocyanate, naphthalene diisocyanate, hexamethylene diisocyanate, trimethylhexamethylene diisocyanate, cyclohexane diisocyanate, methylcyclohexane diisocyanate, isophorone diisocyanate, dicyclohexyl diisocyanate , Dicyclohexylmethane diisocyanate, etc. These crosslinking agents may be used alone or in combination of two or more. When a cross-linking agent component is contained, a component for promoting cross-linking, such as a cross-linking catalyst, may be used together. In addition, in the formation of each coating layer (antistatic layer, easy-adhesion layer), particles may be used in combination to improve adhesion and sliding properties. From the viewpoint of the transparency of the film, the average particle diameter is preferably in a range of 1.0 μm or less, more preferably 0.5 μm or less, and even more preferably 0.2 μm or less. In order to further improve the sliding property, the lower limit is preferably in a range of 0.01 μm or more, more preferably 0.03 μm or more, and particularly preferably in a range larger than the film thickness of the coating layer. Specific examples of the particles used include silicon dioxide, alumina, kaolin, calcium carbonate, and organic particles. Furthermore, as long as the purpose of the present invention is not impaired, in the formation of each coating layer, a defoamer, a coating improver, a thickener, an organic lubricant, an antistatic agent, and ultraviolet rays may be used in combination as necessary. Absorbents, antioxidants, foaming agents, dyes, pigments, etc. The thickness (after drying) of each coating layer constituting the laminated polyester film is usually 0.003 to 1 μm, preferably 0.005 to 0.5 μm, and still more preferably 0.01 to 0.2 μm. When the thickness is less than 0.003 μm, the amount of the ester cyclic trimer deposited from the film may not be sufficiently small. In addition, when the thickness is more than 1 μm, there are cases in which the appearance of the coating layer is deteriorated or the adhesion is reduced. In addition, the thickness of the entire laminated polyester film of the present invention is not particularly limited as long as it is a film-forming range, and is preferably 12 μm or more, more preferably 25 μm or more, and more preferably 250 μm or less, and more preferably It is 125 μm or less. [Coating method] As a method for applying the coating solution to the polyester film, for example, air knife coating, blade coating, rod coating, bar coating, blade coating, extrusion coating, and impregnation can be used. Coating, reverse roll coating, transfer roll coating, gravure coating, contact roll coating, casting coating, spray coating, curtain coating, calender coating, extrusion coating, etc. Coating method. In order to improve the applicability and adhesion of the coating solution to the film, the polyester film may be subjected to chemical treatment, corona discharge treatment, plasma treatment, etc. before coating. When each coating layer (antistatic layer, easy-adhesive layer) is provided on a polyester film by in-line coating, it is preferable to manufacture a laminated polyester film according to the following points: using the above-mentioned series of compounds as an aqueous solution Or an aqueous dispersion, and a solid coating composition concentration of about 0.1 to 50% by weight is adjusted to a standard coating solution and coated on a polyester film. In addition, a small amount of an organic solvent may be contained in the coating liquid for the purpose of improving the dispersibility with respect to water, the improvement of the film forming property, and the like within a range that does not detract from the gist of the present invention. The organic solvent may be only one type, or two or more types may be appropriately used. The drying and curing conditions when each coating layer is formed on a polyester film are not particularly limited. For example, in the case where each coating layer is provided by offline coating, it is preferably 80 to usually The heat treatment is performed at 200 ° C for 3 to 40 seconds, preferably at 100 to 180 ° C for 3 to 40 seconds. On the other hand, in the case where each coating layer is provided by in-line coating, it is preferred that the heat treatment is performed for 3 to 200 seconds usually at 70 to 280 ° C. The haze of the laminated polyester film of the present invention is preferably 2% or less. It is more preferably 1% or less, and most preferably 0.6% or less. In the case where the haze of the laminated polyester film exceeds 2%, there are cases where obstacles are caused when the structural unit as a surface protection film is used in the inspection accompanied by optical evaluation. [Surface protective film] The surface protective film of the present invention only needs to have at least the laminated polyester film of the present invention, and may be the laminated polyester film of the present invention alone, but it is usually preferred to further have an adhesive layer to impart adhesion Of the composition. Furthermore, the surface protective film refers to one aspect of the use of the laminated polyester film of the present invention, and the layer structure formed by providing an adhesive layer on the laminated polyester film of the present invention described above is itself one of the laminated polyester films of the present invention Appearance. [Adhesive Layer] Next, the adhesive layer in the present invention will be described below. In the surface protective film, an adhesive layer is preferably provided on the easy-adhesive layer of the laminated polyester film. The adhesive layer may be provided on only one side of the laminated polyester film, or on both sides, preferably on one side. When it is provided on one side, it may be provided on any one of the antistatic layer and the easy-adhesive layer, and preferably on the easy-adhesive layer. The adhesive layer in the present invention means a layer including an adhesive material, and a conventionally known material such as a silicone adhesive, an acrylic adhesive, or the like can be used within a range that does not impair the gist of the present invention. Among them, an acrylic adhesive is preferable in terms of a wide range of adjustment of the adhesive properties and wide use. In the present invention, a case where an acrylic adhesive is used as a specific example will be described below. The acrylic adhesive means an adhesive containing an acrylic polymer formed by using an acrylic monomer as an essential monomer component as a base polymer. The acrylic polymer preferably has an alkyl (meth) acrylate and / or an alkoxyalkyl (meth) acrylate having a linear or branched alkyl group as an essential monomer component (in addition It is preferably formed as the main monomer component. Furthermore, the acrylic polymer is particularly preferably an acrylic polymer formed by using an alkyl (meth) acrylate and an alkoxyalkyl acrylate having a linear or branched alkyl group as essential monomer components. . That is, the adhesive layer in the present invention is particularly preferably formed by using an alkyl (meth) acrylate and an alkoxyalkyl acrylate having a linear or branched alkyl group as essential monomer components. A layer formed by an acrylic adhesive. The monomer component forming the acrylic polymer may further include a polar group-containing monomer, a polyfunctional monomer, or another copolymerizable monomer as a copolymerizable monomer component. In addition, the "(meth) acrylic acid" mentioned above means "acrylic acid" and / or "methacrylic acid", and the other is the same. In addition, there is no particular limitation. The content of the acrylic polymer as the base polymer in the adhesive layer is preferably 60% by weight or more, and more preferably 80% by weight based on the total weight of the adhesive layer (100% by weight). the above. In the adhesive layer, a cross-linking agent, a cross-linking accelerator, and an adhesion-imparting agent (such as a turpentine derivative resin, a polyterpene resin, a petroleum resin, and an oil-soluble phenol resin) may be used, as long as the gist of the invention is not impaired. Etc.), anti-aging agent, filler, colorant (pigment or dye, etc.), ultraviolet absorber, antioxidant, chain transfer agent, plasticizer, softener, surfactant, antistatic agent, etc. The crosslinking agent can control the gel fraction of the adhesive layer by crosslinking the base polymer of the adhesive layer. Examples of the crosslinking agent include an isocyanate-based crosslinking agent, an epoxy-based crosslinking agent, and a melamine-based crosslinking agent. An isocyanate-based crosslinking agent or an epoxy-based crosslinking agent is preferably used. Moreover, a crosslinking agent can be used individually or in combination of 2 or more types. The thickness (after drying) of the adhesive layer of the surface protective film is preferably in the range of 10 to 100 μm, and more preferably 20 to 50 μm. When the thickness of the adhesive layer (after drying) is less than 10 μm, it may be difficult to obtain the required adhesive force. On the other hand, when the thickness of the adhesive layer (after drying) exceeds 100 μm, the curing of the adhesive layer may become insufficient, and problems such as a decrease in workability may occur. The thickness of the entire surface protective film is not particularly limited as long as the adhesiveness and workability are sufficient, preferably 22 to 350 μm, and more preferably 45 to 175 μm. A preferred embodiment of the present invention is shown below. <A1> A laminated polyester film, characterized in that it has a laminated structure of at least 3 or more layers, and an outermost layer (surface layer A) does not substantially contain particles, and a polythiophene-containing layer is provided on the surface layer A Or a coating layer 1 of a polythiophene derivative and an adhesive polymer. <A2> The laminated polyester film according to the above <A1>, which contains a titanium-based polymerization catalyst. <A3> The laminated polyester film according to the above <A1> or <A2>, wherein a coating layer 2 containing a polyester resin and a crosslinking agent is provided on the other outermost surface layer (surface layer B). <A4> The laminated polyester film according to the above <A3>, further comprising an adhesive layer on the coating layer 2. <A5> The laminated polyester film according to the above <A4>, wherein the adhesive layer contains an acrylic adhesive. <A6> A surface protection film comprising the laminated polyester film according to the above <A4> or <A5>. In addition, another preferred embodiment of the present invention is shown below. <B1> A coating film characterized by having a multilayer polyester film having a laminated structure of at least 3 layers, an intermediate layer of the multilayer polyester film containing an ultraviolet absorber, and one of the multilayer polyester films The surface layer (surface layer A) does not substantially contain particles, and a coating layer 1 containing an antistatic agent and an adhesive polymer is provided on the outermost surface layer (surface layer A). <B2> The coating film according to the above <B1>, wherein the antistatic agent is polythiophene or a polythiophene derivative. <B3> The coating film according to the above <B1> or <B2>, wherein the multilayer polyester film contains a titanium-based polymerization catalyst. <B4> The coating film according to any one of the above <B1> to <B3>, wherein a polyester resin and a cross-linking layer are provided on the other outermost surface layer (surface layer B) of the multilayer polyester film剂 的 制造 层 2。 Coating layer 2. <B5> The coating film according to the above <B4>, wherein an adhesive layer is provided on the surface of the coating layer 2. <B6> The coating film according to the above <B5>, wherein the adhesive layer is formed by an acrylic adhesive. <B7> A surface protection film including the coating film described in any one of the above <B1> to <B6>. [Examples] Hereinafter, the present invention will be described in more detail by examples. However, the present invention is not limited to the following examples as long as the present invention does not exceed the gist thereof. The measurement methods used in the present invention are as follows. (1) Limiting viscosity of polyester (dL / g) 1 g of polyester after removing the other polymer components and pigments which are insoluble in polyester by fine scale, adding phenol / tetrachloroethane = 50/50 (weight ratio) 100 mL of the solvent was mixed and dissolved, and the measurement was performed at 30 ° C. (2) Average particle size (d50) A 50% cumulative volume fraction in the equivalent spherical distribution measured by a centrifugal sedimentation type particle size distribution measuring device ("SA-CP3" manufactured by Shimadzu Corporation) The particle diameter is set to an average particle diameter d50. (3) Ester cyclic trimer content (oligomer content) contained in the polyester raw material The volume ratio of the polyester raw material weighed about 200 mg and dissolved in chloroform / HFIP (hexafluoro-2-isopropanol) 3: 2 mixed solvent in 2 mL. After dissolving, 20 mL of chloroform was added, and then 10 mL of methanol was added little by little. The precipitate was removed by filtration, and further, the precipitate was washed with a mixed solvent of chloroform / methanol volume ratio of 2: 1, and the filtrate and washing liquid were recovered, concentrated by an evaporator, and then dried. The dried product was dissolved in 25 mL of DMF (dimethylformamide), and the solution was supplied to a liquid chromatograph ("LC-7A" manufactured by Shimadzu Corporation), and the content of DMF was determined. The content of the ester cyclic trimer is divided by the amount of the polyester raw material dissolved in the chloroform / HFIP mixed solvent to obtain the content of the ester cyclic trimer (% by weight). The content of the ester cyclic trimer in DMF is determined from the peak area ratio of the peak area of the standard sample to the peak area of the measurement sample (absolute calibration curve method). The standard sample is prepared by accurately measuring the ester cyclic trimer prepared in advance and dissolving it in the accurately measured DMF. The conditions of liquid chromatography are as follows. "Measurement conditions" Mobile phase A: acetonitrile mobile phase B: 2% by weight aqueous acetic acid solution. Column: "MCI GEL ODS 1HU" manufactured by Mitsubishi Chemical Corporation. Column temperature: 40 ° C. Flow rate: 1 mL / min. Detection wavelength: 254 After the film thickness of the nm (4) layer is fixed and formed by epoxy resin, the film is cut by a microtome, and the cross section of the film is observed by a transmission electron microscope photograph. The two interfaces in this cross section that are approximately parallel to the film surface were observed by light and darkness. The distance between the two interfaces and the film surface was measured from 10 photos, and the average value was used as the layer thickness. (5) The amount of metal elements and the amount of phosphorus elements in the film was measured using a fluorescent X-ray analyzer (manufactured by Shimadzu Corporation, model "XRF-1500") under the conditions shown in Table 1 below, using the film FP The method also determines the amount of elements in the film by single-plate measurement. Furthermore, the detection limit in this method is usually around 1 ppm. [Table 1] (6) Haze (transparency evaluation) The haze of the sample film was measured with a haze meter "HM-150" (manufactured by Murakami Color Technology Research Institute Co., Ltd.) in accordance with JIS K7136. Thereafter, evaluation of transparency was performed based on the following criteria. (Criterion criteria) A: Haze is 0.6% or less (especially good) B: Haze exceeds 0.6% and is 1.0% or less (good) C: Haze exceeds 1.0% and is 2.0% or less (there is a practical problem) Case) D: Haze exceeds 2.0% (there is a practical problem) (7) Light transmittance Using a spectrophotometer (U-3310 manufactured by Hitachi High-Tech Fielding Co., Ltd.), the light transmission at a wavelength of 350 nm is measured rate. Thereafter, the determination is performed based on the following criteria. (Judgment criteria) A: The light transmittance is 7% or less (especially good) B: The light transmittance is more than 7% and 10% or less (good) C: The light transmittance is more than 10% (there may be practical problems) (8) Surface specific resistance value R (antistatic property evaluation) The surface specific resistance of the surface of the sample film was measured based on the following method (8-1). In the method of (8-1), it is higher than 1 × 10 8 The surface specific resistance of Ω cannot be measured, so for the sample that cannot be measured in (8-1), the method of (8-2) is used. "Measuring method" (8-1) After using a low-resistivity meter "Loresta GP MCP-T600" (manufactured by Mitsubishi Chemical Corporation) and controlling the humidity of the sample in a measurement environment at 23 ° C and 50% RH for 30 minutes, Measure the specific resistance of the surface. (8-2) Using a high-resistance measuring device "HP4339B" and a measuring electrode "HP16008B" (both manufactured by Hewlett-Packard Co., Ltd., Japan), the samples were subjected to humidity control in a measurement environment at 23 ° C and 50% RH for 30 minutes. The surface specific resistance was measured, and the antistatic property was evaluated based on the following criteria. (Judgment criteria) A: R is 1 × 10 7 Ω or less (practical. Particularly good) B: R exceeds 1 × 10 7 Ω and 1 × 10 8 Ω or less (practical) C: R exceeds 1 × 10 8 Ω and 1 × 10 9 Ω or less (may be a practical problem) D: R exceeds 1 × 10 9 Ω (difficult to apply) (9) Evaluation of the solvent resistance of the antistatic layer On the surface of the antistatic layer of the sample film, 1 mL of a toluene solvent was dropped with a dropper. Thereafter, the surface of the antistatic layer after natural drying was visually observed, and the solvent resistance was evaluated based on the following criteria. (Judgment Criteria) A: There is no dripping trace of the toluene solvent, and the solvent resistance is good. (No problem in practical use) B: Traces of dripping of the toluene solvent were slightly confirmed. (It may be a problem in practical use) C: The dripping trace of the toluene solvent was clearly recognized. (Practical problems) (10) The adhesiveness to the adhesive layer was evaluated on the surface of the easy-adhesive layer of the sample film, and an acrylic adhesive containing the following adhesive composition was applied using a baking applicator. At this time, the coating amount (before drying) was set to 2 mil. Then, a hot-air circulation furnace was heat-treated at 150 ° C. for 3 minutes, thereby setting an adhesive layer on the surface of the easy-adhesive layer. The sample film provided with an adhesive layer was bonded to an untreated PET film (thickness: 188 μm) by a rubber roller weighing 2 kg. Then, the laminated body was cut into 50 mm × 300 mm, and the peeling force after standing at room temperature for 1 hour was measured. The peeling force was a 180 ° peeling of the interface between the untreated PET film and the adhesive layer using a tensile tester "Intesco Model 2001" (manufactured by Intesco Co., Ltd.) at a tensile speed of 300 mm / min. Evaluation of adhesiveness was performed based on the following criteria. "Adhesive composition" Main agent: "AT352" (manufactured by Saiden Chemical Co., Ltd.) 100 parts by weight of hardener: "AL" (manufactured by Saiden Chemical Co., Ltd.) 0.25 parts by weight of additive: "X-301-375SK" (Saiden Chemical Co., Ltd.) 0.25 parts by weight of additive: "X-301-352S" (manufactured by Saiden Chemical Co., Ltd.) 0.4 parts by weight of toluene: 40 parts by weight (judgment criterion) A: At the interface between the adhesive layer and the untreated PET film Peeling occurred. (No problem in practice) B: Peeling occurs at the interface between the adhesive layer and the surface of the easy-adhesion layer. Or peeling occurs at the interface between the polyester film substrate and the easy-adhesion layer. (Practical problems) (11) Evaluation of the visibility of the surface protective film (1) (Substitute evaluation of the practical characteristics of oligomer sealing) Each surface protective film obtained in the examples and comparative examples was cut into 5 cm in advance After seeing the square, in a state where the float glass plate (size: 7 cm square, thickness 2 mm, according to JIS R3202) and the adhesive layer are laminated, in a hot air circulation furnace (manufactured by TABAI: type "PVH-210") , Heat treatment at 180 ° C for 10 minutes. After that, the adhesive layer was observed from the surface protective film side in the bonded state, and judged based on the following criteria. (Judgment criteria) A: The adhesive layer can be inspected in a state where a surface protective film is attached. After heat treatment, the surface protection film has a very high transparency, which is particularly easy to inspect (no problem in practice). B: In the state where the surface protection film is bonded, the inspection of the adhesive layer can be performed. The haze of the surface protective film is slightly deteriorated due to the precipitation of oligomers, etc., but it is easy to inspect (no problem in practical use) C: The adhesive layer can be inspected with the surface protective film attached, but occasionally Slightly more difficult to check. (It may be a practical problem.) D: The haze of the surface protective film is deteriorated due to heat treatment. Therefore, it is difficult to check the adhesive layer when the surface protective film is attached (there are practical problems) (12) Evaluation of the visibility of the surface protective film (2) (Substitute evaluation of practical characteristics of the ease of inspection accompanied by optical evaluation) Each surface protective film obtained in the examples and comparative examples was bonded to a polarizing plate, and another polarizing plate was placed On the surface protective film, as the polarizing plate is rotated, the field of view becomes the darkest. Thereafter, in a state of the above-mentioned laminated body structure (upper polarizing plate / surface protective film (adhesive layer) / lower polarizing plate), the surface protective film is viewed from the upper polarizing plate side using an optical microscope (transmitted light), and based on The reference state is used to determine the observation state at this time. (Judgment criteria) A: The polarizing plate can be inspected in a state where a surface protective film is attached. Even if it is dark, the visibility is very high, and it is particularly easy to inspect (no problem in practice) B: The inspection of the polarizing plate can be performed with the surface protective film attached. It is easy to inspect even if it is dark, and it is easy to inspect (no problem in practice) C: It is possible to inspect the polarizing plate with the surface protective film attached, but it may be difficult to inspect. (It may be a practical problem) D: It is difficult to inspect the polarizing plate in a state where the surface protective film is attached. (Problems exist in practical use) (13) Laser processability (substitutive evaluation of practical characteristics) The surface protective films produced in the examples and comparative examples were used in a state where the adhesive layer was bonded to a glass panel (thickness: 0.33 mm). The YAG laser (energy density: 600 mJ / cm 2 , Frequency: 20 Hz), the glass panel was cut to a size of 60 mm × 130 mm, the cut surface was observed with an optical microscope, and the determination was made based on the following criteria. (Judgment Criteria) A: No foreign matter from the surface protective film is attached, or no burrs are generated at all. (No problem in practice) B: A very small amount of foreign matter from the surface protective film is attached, but no burrs are generated. (Not a problem in practice) C: A very small amount of foreign matter from the surface protective film was adhered, and burrs were confirmed. (It may be a practical problem.) D: Foreign matter from the surface protective film is noticeably attached, and burrs are confirmed. (Practical problems) (14) Evaluation of the visibility of the surface protective film (3) (Approximate evaluation of the practical characteristics of appearance evaluation and ease of inspection) The antistatic layer of each surface protective film obtained in the examples and comparative examples The film surface is irradiated with the reflected light from the LED light source to check the appearance. The observation state at this time was determined based on the following criteria. 《Criterion Criteria》 A: There is no difference in the depth of appearance, and inspection can be performed. Especially easy to check. B: The difference in shades of the appearance can be confirmed, but inspection can still be performed. (No problem in practical use) C: The difference in appearance can be clearly confirmed, but it is sometimes difficult to check. (It may be a practical problem.) D: The difference in the depth of the appearance is affected, and it is difficult to check. (Practical problems) (15) Use the difference of the sulfur detection amount measured by the fluorescent X-ray analyzer to the lightest part and the deepest part of the difference in the appearance of the appearance detected in the inspection of the above (14) Using a fluorescent X-ray analysis device, the difference between the detected amounts of sulfur is compared with a relative value. << Judgment Criteria >> A: The difference between the detected amounts of sulfur measured by a fluorescent X-ray analyzer is 2% by weight or less. B: The difference between the detected amounts of sulfur measured by a fluorescent X-ray analysis device exceeds 2% by weight and is 5% by weight or less. C: The difference between the detected amounts of sulfur measured by a fluorescent X-ray analyzer exceeds 5 wt% and is 8 wt% or less. D: The difference between the detected amounts of sulfur measured by a fluorescent X-ray analyzer exceeds 8% by weight. (16) Comprehensive evaluation (substitute evaluation for practical characteristics) The surface protective films produced in the examples and comparative examples were used to perform the evaluations (6) to (15) above, and comprehensive evaluations were performed based on the following criteria. (Judgment criteria) A: Each evaluation is A judgment. (No problem in practice. Particularly good) B: At least one is judged by B, the others are judged by A. (No problem in practice) C: At least one of them is C judgment, and no D judgment. (There are cases where this is practically a problem.) D: At least one is judged by D. (Practical problems). The polyesters used in Examples and Comparative Examples were prepared as follows. <Production method of polyester (A)> Using 100 parts by weight of dimethyl terephthalate and 60 parts by weight of ethylene glycol as starting materials, 0.09 parts by weight of magnesium acetate tetrahydrate as a catalyst is placed in a reactor During the reaction, the reaction start temperature was set to 150 ° C, the methanol was distilled off, and the reaction temperature was gradually increased, and after 3 hours, it was set to 230 ° C. After 4 hours, the transesterification reaction was substantially completed. After adding 0.04 parts by weight of acidic ethyl phosphate to the reaction mixture, 0.04 parts by weight of antimony trioxide was added, and a polycondensation reaction was performed for 4 hours. That is, the temperature was gradually raised from 230 ° C to 280 ° C. On the other hand, the pressure system gradually decreased from normal pressure and was finally set to 0.3 mmHg. After the reaction started, the reaction was stopped at a time when the limiting viscosity was equal to 0.63 dL / g according to the change in the stirring power of the reaction tank, and the polymer was sprayed under nitrogen pressure. The limiting viscosity of the obtained polyester (A) was 0.63 dL / g, and the content of the ester cyclic terpolymer was 0.97% by weight. <Manufacturing method of polyester (B)> After polyester (A) is pre-crystallized at 160 ° C in advance, solid-phase polymerization is performed in a nitrogen environment at a temperature of 220 ° C to obtain an ultimate viscosity of 0.75 dL / g, an ester Polyester (B) having a cyclic trimer content of 0.46% by weight. <Production method of polyester (C)> 100 parts by weight of dimethyl phthalate, 60 parts by weight of ethylene glycol, 30 ppm of acidic acid ethyl phosphate with respect to the produced polyester, and 100 with respect to the produced polyester ppm of magnesium acetate tetrahydrate as a catalyst was mixed, and the esterification reaction was performed at 260 ° C under a nitrogen environment. Then, 50 ppm of tetrabutyl titanate was added to the resulting polyester, the temperature was raised to 280 ° C over 2 hours and 30 minutes, and the pressure was reduced to absolute pressure 0.3 kPa, followed by melt polycondensation for 80 minutes to obtain an ultimate viscosity of 0.61 dL / g, The polyester (C) having an ester cyclic terpolymer content of 1.02% by weight. <Manufacturing method of polyester (D)> After the polyester (C) is pre-crystallized at 160 ° C in advance, solid-phase polymerization is performed under a nitrogen environment at a temperature of 210 ° C to obtain an ultimate viscosity of 0.71 dL / g and an ester ring. Polyester (D) having a content of a terpolymer of 0.50% by weight. <Production method of polyester (E)> In addition to 100 parts by weight of polyester (C), 0.03 parts by weight of silica particles having an average particle diameter (d50) of 2.3 μm is added and melt-kneaded. The polyester (D) was obtained by the same method as the method for producing the polyester (D). Regarding the obtained polyester (E), the limiting viscosity was 0.72 dL / g, and the content of the ester cyclic terpolymer was 0.50% by weight. <Production method of polyester (F)> In addition to 100 parts by weight of polyester (C), 1.5 parts by weight of alumina particles having an average particle diameter (d50) of 0.3 μm is added and melt-kneaded. The polyester (F) was obtained by the same method as the method for producing the ester (D). Regarding the obtained polyester (F), the limiting viscosity was 0.72 dL / g, and the content of the ester cyclic terpolymer was 0.50% by weight. <Production method of polyester (G)> With respect to 100 parts by weight of polyester (C), 2,2- (1,4-phenylene) bis is added as an ultraviolet absorbent so as to have a concentration of 10% by weight. 4H-3,1-benzofluoren-4-one] was melt-kneaded, and a polyester (G) was obtained by the same method as the method for producing a polyester (D). Regarding the obtained polyester (G), the limiting viscosity was 0.72 dL / g, and the content of the ester cyclic terpolymer was 0.52% by weight. <Manufacturing method of polyester (H)> With respect to 100 parts by weight of polyester (C), 2,2'-methylenebis [6- (benzo A triazol-2-yl) -4-third octylphenol] was melt-kneaded, and a polyester (H) was obtained by the same method as the method for producing a polyester (D). Regarding the obtained polyester (H), the limiting viscosity was 0.72 dL / g, and the content of the ester cyclic terpolymer was 0.52% by weight. "Antistatic layer and easy-adhesive layer" The raw materials used in the antistatic layer and the easy-adhesive layer are shown below. Moreover, the composition of the coating liquid of an antistatic layer and an easy-adhesion layer is shown in Table 2 and Table 3. (A1): A mixture containing polyethylene dioxythiophene and polystyrene sulfonic acid ("BaytronPAG" manufactured by Starck Co., Ltd.) (A2): The following formula is used in a ratio of 80/10/10 by weight ratio A polymer compound having a number average molecular weight of 21,000 obtained by copolymerizing the structural unit of 1-1, the structural unit of the following formula 1-2, and the structural unit of the following formula 1-3 [Chem. 4] (B1): Polyurethane resin obtained polyester containing 664 parts by weight of terephthalic acid, 631 parts by weight of isophthalic acid, 472 parts by weight of 1,4-butanediol, and 447 parts by weight of neopentyl glycol Polyol. Then, 321 parts by weight of adipic acid and 268 parts by weight of dimethylolpropionic acid were added to the obtained polyester polyol to obtain a pendant carboxyl group-containing polyester polyol A. Furthermore, 160 parts by weight of hexamethylene diisocyanate was added to 1880 parts by weight of the above-mentioned polyester polyol A to obtain a polyurethane resin aqueous coating material. (B2): A monomer composition of an aqueous dispersion of a polyester resin copolymerized with the following composition: (acid component) terephthalic acid / isophthalic acid / sodium isophthalic acid-5-sulfonate // (Diol component) ethylene glycol / 1,4-butanediol / diethylene glycol = 56/40/4/70/20/10 (mol%) (B3): acrylic acid polymerized with the following composition Ethyl acrylate / n-butyl acrylate / methyl methacrylate / N-hydroxymethacrylamide / acrylic acid = 65/21/10/2/2 (wt%) emulsified polymer Emulsifier: Anionic surfactant) (C1): Glycerin (n = 1) in the above formula (III): Glycerin (n = 2) in the above formula (III): Polyglycerol (c3) in n = 2 in the above formula (III): Polypropylene oxide adduct of polyglycerol backbone with n = 2 (average molecular weight 750) (D1): epoxy compound: polyglycerol polyglycidyl ether (D2): "Epocros" (Japan) as an oxazoline compound Manufactured by Catalyst Co., Ltd., with an oxazoline group content of 7.7 mmol / g) (E1): Silica sol (F1) with an average particle size of 65 nm: Hardened silicone resin: "KS-847H" (Shin-Etsu Chemical Industry Co., Ltd. Co., Ltd.) (G1): Platinum-containing catalyst: "catPL-50T" (letter Chemical Industries, Ltd.) [Table 2] [table 3] Example A1 (Production of laminated polyester film F1a) 100% by weight of polyester (D) was used as the raw material of surface layer A, and polyesters (D) and (F) were mixed at a ratio of 90% by weight and 10% by weight, respectively. ) Is used as the raw material for the surface layer B, and 100% by weight of the polyester (C) is used as the raw material for the intermediate layer, which is supplied to three extruders with vent holes and melt-extruded at 290 ° C. Using an electrostatic adhesion method, cooling and solidification was performed on a cooling roller having a surface temperature set to 40 ° C to obtain an amorphous film having a thickness of 1500 μm. The film was stretched 3.4 times in the longitudinal direction at 85 ° C. Second, the thickness of the antistatic layer and the easy-adhesive layer (after drying) will be 0.06 g / m, respectively. 2 In this manner, a coating liquid 1-1 for an antistatic layer is coated on the surface layer A, and a coating liquid 2-1 for the easy-adhesion layer is coated on the surface layer B. Thereafter, the film was introduced into a tenter, and stretched 4.0 times in the transverse direction at 100 ° C. After heat treatment at 230 ° C, a 2% relaxation treatment was performed in the transverse direction to obtain a thickness of 75 μm (thickness ratio: surface layer A / Interlayer / surface layer B = 6 μm / 63 μm / 6 μm) laminated polyester film F1a. (Production of surface protective film) An adhesive layer containing the following adhesive layer composition was applied to the surface of the easy-adhesion layer of the laminated polyester film F1a so that the thickness (after drying) became 25 μm, and dried at 100 ° C. for 5 minutes. To obtain a surface protective film. << Adhesive layer composition >> By conventional methods, butyl acrylate (100 parts by weight) and acrylic acid (6 parts by weight) are copolymerized in ethyl acetate to obtain acrylic acid having a weight average molecular weight of 600,000 (in terms of polystyrene). A copolymer solution (30% by weight of solid content). Tetrad C (Mitsubishi Gas Chemical Co., Ltd.) is added as an epoxy-based crosslinking agent to 0.2 parts by weight of N, N-dimethylaminoethyl acrylate, based on 100 parts by weight of acrylic copolymer (solid content). 6 parts by weight) to obtain an adhesive layer composition. Example A2 to A6 and A9 to A23 (manufacturing of laminated polyester films F2a to F6a and F9a to F23a) In the manufacturing method of laminated polyester film F1a, the type of polyester was changed as shown in Tables 4 to 5, and Except for the composition of the coating solution of the antistatic layer and the easy-adhesion layer, it was produced in the same manner as the laminated polyester film F1a to obtain laminated polyester films F2a to F6a and F9a to F23a. (Production of surface protective film) A surface protective film was obtained in the same manner as in Example A1 except that the laminated polyester films F2a to F6a or F9a to F23a were used instead of the laminated polyester film F1a, respectively. Examples A7 and A8 (manufacturing of the laminated polyester film F7a and F8a) In the same manner as the laminated polyester film F1a, a laminated polyester film F7a was obtained. In addition, in the manufacturing method of the laminated polyester film F1a, the coating liquid composition of the easy-adhesive layer was changed as shown in Table 4, and it was manufactured in the same manner as the laminated polyester film F1a to obtain a laminated polyester. Film F8a. (Manufacturing of surface protection film) Use laminated polyester film F7a or F8a respectively instead of laminated polyester film F1a, and change the type of adhesive layer to polysiloxane adhesive (manufactured by Toray Dow Corning, "SD4580"), in addition to this Other than that, it manufactured similarly to Example A1, and obtained the surface protection film. Comparative Example A1 (manufacturing of laminated polyester film F24a) A laminated polyester film F1a was produced in the same manner as laminated polyester film F1a except that no antistatic layer was provided, and laminated polyester was obtained Film F24a. (Manufacture of Surface Protection Film) A surface protection film was obtained in the same manner as in Example A1 except that the laminated polyester film F24a was used instead of the laminated polyester film F1a. Comparative Example A2 (Production of laminated polyester film F25a) In the method of producing laminated polyester film F1a, the type of polyester was changed as shown in Table 6, except that the same procedure was performed as in laminated polyester film F1a. It produced and obtained the laminated polyester film F25a. (Production of surface protective film) A surface protective film was obtained in the same manner as in Example A1 except that the laminated polyester film F25a was used instead of the laminated polyester film F1a. Comparative Examples A3 and A4 (manufacturing of laminated polyester films F26a and F27a) In the manufacturing method of laminated polyester film F1a, as shown in Table 6, the composition of the coating solution of the antistatic layer was changed. The polyester film F1a was produced in the same manner, and laminated polyester films F26a and F27a were obtained. (Manufacture of Surface Protection Film) A surface protection film was obtained in the same manner as in Example A1 except that the laminated polyester film F26a or F27a was used instead of the laminated polyester film F1a. The characteristics of the surface protective films obtained in the above examples and comparative examples are shown in Tables 4 to 6 below. [Table 4] [table 5] [TABLE 6] Example B1 (Production of laminated polyester film F1b) 100% by weight of polyester (D) was used as the raw material of surface layer A, and polyesters (D) and (F) were mixed at a ratio of 90% by weight and 10% by weight, respectively. The resulting raw material is used as the raw material of the surface layer B, and the raw materials obtained by mixing the polyesters (C), (G), and (H) at a ratio of 50% by weight, 25% by weight, and 25% by weight, respectively, It was supplied to three extruders with vent holes. After melt extrusion at 290 ° C, it was cooled and solidified on a cooling roller with a surface temperature set to 40 ° C by using an electrostatic adhesion method to obtain a thickness of about 1500 μm. Amorphous film. This film was stretched 3.4 times in the longitudinal direction at 85 ° C. Second, the thickness of the antistatic layer and the easy-adhesive layer (after drying) will be 0.06 g / m, respectively. 2 In this manner, a coating liquid 1-1 for an antistatic layer is coated on the surface layer A, and a coating liquid 2-1 for the easy-adhesion layer is coated on the surface layer B. Thereafter, the film was introduced into a tenter, and stretched 4.0 times in the transverse direction at 100 ° C. After heat treatment at 230 ° C, a 2% relaxation treatment was performed in the transverse direction to obtain a thickness of 75 μm (thickness ratio: surface layer A / Interlayer / surface layer B = 6 μm / 63 μm / 6 μm) laminated polyester film F1b. (Production of surface protective film) An adhesive layer containing the following adhesive layer composition was applied to the surface of the easy-adhesive layer of the laminated polyester film F1b so that the thickness (after drying) became 25 μm, and dried at 100 ° C for 5 minutes. To obtain a surface protective film. << Adhesive layer composition >> By conventional methods, butyl acrylate (100 parts by weight) and acrylic acid (6 parts by weight) are copolymerized in ethyl acetate to obtain acrylic acid having a weight average molecular weight of 600,000 (in terms of polystyrene). A copolymer solution (30% by weight of solid content). Tetrad C (Mitsubishi Gas Chemical Co., Ltd.) is added as an epoxy-based crosslinking agent to 0.2 parts by weight of N, N-dimethylaminoethyl acrylate, based on 100 parts by weight of acrylic copolymer (solid content). 6 parts by weight) to obtain an adhesive layer composition. Example B2 to B6 and B9 to B28 (manufacturing of laminated polyester film F2b to F6b and F9b to F28b) In the manufacturing method of laminated polyester film F1b, the type of polyester was changed as shown in Tables 7 to 9, and Except for the composition of the coating solution of the antistatic layer and the easy-adhesive layer, it was produced in the same manner as the laminated polyester film F1b, and laminated polyester films F2b to F6b and F9b to F28b were obtained. (Production of surface protection film) A surface protection film was obtained in the same manner as in Example B1 except that the laminated polyester films F2b to F6b or F9b to F28b were used instead of the laminated polyester film F1b, respectively. Examples B7 and B8 (manufacturing of the laminated polyester film F7b and F8b) were produced in the same manner as the laminated polyester film F1b to obtain a laminated polyester film F7b. In addition, in the manufacturing method of the laminated polyester film F1b, except that the coating liquid composition of the easy-adhesive layer was changed as shown in Table 7, it was manufactured in the same manner as the laminated polyester film F1b to obtain a laminated polyester. Film F8b. (Manufacturing of surface protective film) Laminated polyester film F7b or F8b is used instead of laminated polyester film F1b, and the type of adhesive layer is changed to polysiloxane adhesive (manufactured by Toray Dow Corning Corporation, "SD4580"), Other than that, it manufactured similarly to Example B1, and obtained the surface protection film. Comparative Example B1 (manufacturing of laminated polyester film F29b) In the manufacturing method of laminated polyester film F1b, except that no antistatic layer was provided, it was manufactured in the same manner as laminated polyester film F1b to obtain laminated polyester Film F29b. (Manufacture of Surface Protection Film) A surface protection film was obtained in the same manner as in Example B1 except that the laminated polyester film F29b was used instead of the laminated polyester film F1b. Comparative Example B2 (manufacturing of laminated polyester film F30b) In the manufacturing method of laminated polyester film F1b, the type of polyester was changed as shown in Table 10, except that the same procedure was performed as in laminated polyester film F1b. It produced and obtained the laminated polyester film F30b. (Manufacture of Surface Protection Film) A surface protection film was obtained in the same manner as in Example B1 except that the laminated polyester film F30b was used instead of the laminated polyester film F1b. Comparative Examples B3 and B4 (manufacturing of laminated polyester films F31b and F32b) In the manufacturing method of laminated polyester film F1b, as shown in Table 10, the composition of the coating solution of the antistatic layer was changed. The polyester film F1b was manufactured in the same manner, and laminated polyester films F31b and F32b were obtained. (Production of surface protective film) A surface protective film was obtained in the same manner as in Example B1 except that the laminated polyester film F31b or F32b was used instead of the laminated polyester film F1b. Comparative Example B5 is described together with the prior art. Furthermore, in the evaluation of laser processing, the surface protection film itself does not have a laser light absorption function, so a small amount of foreign matter from the surface protection film was adhered to the cut surface. The characteristics of the surface protective films obtained in the above examples and comparative examples are shown in the following Tables 7 to 10. [TABLE 7] [TABLE 8] [TABLE 9] [TABLE 10] [Industrial Applicability] The laminated polyester film of the present invention can be preferably used, for example, in synthetic resin plates, glass plates, metal plates, optical components, automobile components, electrical or electronic components, building material components, stationery, or office Surface protection of various adherends such as product components. Among them, it is used for the surface protection of optical members that require a high degree of visibility, such as glass substrates, light diffusion films, liquid crystal displays (polarizing plates, retardation plates, light guide plates, mask plates, etc.), and touch panels. In situations such as this, in the state where the surface protective film is attached, it is easy to carry out inspections accompanied by optical evaluation. The antistatic property is good and the laser light absorption function is provided. Therefore, it is possible to prevent the adhesion of foreign matter from the surface protective film as much as possible. Or laser processing (cutting, marking, trimming, opening, etc.) caused by the burr of the component, its industrial value is high.