TWI760677B - 雙軸定向之聚酯反射膜及其製造方法 - Google Patents
雙軸定向之聚酯反射膜及其製造方法 Download PDFInfo
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- TWI760677B TWI760677B TW109101381A TW109101381A TWI760677B TW I760677 B TWI760677 B TW I760677B TW 109101381 A TW109101381 A TW 109101381A TW 109101381 A TW109101381 A TW 109101381A TW I760677 B TWI760677 B TW I760677B
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- polyester
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Abstract
本發明係有關於一雙軸定向之聚酯反射膜,其藉由在成型期間抑制此反射膜之一內多孔層變形而維持優異反射特徵,即使於真空壓縮成型及熱壓成型之後,及其之一製造方法。
Description
背景
1.領域
下列說明係有關於一雙軸定向之聚酯反射膜及其之一製造方法,且更特別地,係有關一雙軸定向之聚酯反射膜,其藉由在膜製期間抑制此反射膜之一內多孔層變形,具有優異成型性且能維持優異反射特徵,即使於真空壓縮成型及熱壓成型之後,及其之一製造方法。
2.相關技藝說明
已廣泛應用於諸如行動裝置、平板裝置、監視器、筆記型電腦,及電視之所有領域的液晶顯示器並非自發光裝置,因此需要一背光單元,其係自一背側提供光。過去,使用一冷陰極射線管之一線光源係通常作為一背光單元之一光源,但最近,使用一發光二極體(LED)之一點光源被廣泛使用。
一背光單元之點/線光源需轉換成一平面光源,作為一顯示器。為此,點光源係除了此光源以外另經由各種光學片狀結構轉換成一平面光源,諸如,一導光板,其將自一側邊發射之LED光轉移至一前表面;一反射膜,其將損失於顯示器後側之光反射回到前表面;一擴散膜,其將照射至前表面之光均勻擴散;一稜鏡膜,其將經擴散之光集中成面光。使用經由一背光單元轉化之一表面光源的一液晶顯示器於一面板部包括一偏光膜、一薄膜電晶體(TFT)、液晶、一濾光器、一偏光濾光器等,以於每一像素單元實現R/G/B顏色。於液晶顯示器之情況,代表光的明暗之一對比率係藉由將一電壓施用至面板部以經由液晶的配置使光阻斷或透射而實現,但具有一問題,顏色對比率係明顯低於一有機發光二極體(OLED),其係一自發光元件,其中,每一像素本身發射光。
為此,顯示器產業正積極地發展一種使用一局部調光方法改良一液晶顯示器的對比率之方法,其中,一點光源係使用多數個LED而個別開/關。於多數個LEDs個別驅動之情況,作為LED元件間光干擾的方法之一,一種在一反射膜上重複形成凹部及孔洞及將LED安置於其內之方法正被研究中。
但是,當一反射膜以高溫成型,一傳統反射膜可能不被充分成型為一合意形狀,或反射膜內部之孔洞於膜製期間變形,且因而使反射特徵快速退化。因此,需要具有優異成型性且於成型後維持反射特徵之一反射膜。
作為一相關技藝,日本早期公開專利公開案第2007-261260號案揭露一反射膜,其包含作為一主要組份之聚酯樹脂,其中,企圖藉由以無機顆粒及與聚酯不相容之樹脂的重量比例之最佳組合改良一製造方法而增強此膜之反射性能。但是,因為前述相關技藝僅改良一般反射性能,成型性不足及於成型期間孔洞變形的問題無法被克服。
[相關技藝文獻]
[專利文獻]
(專利文件1)日本早期公開專利公開案第2007-261260號案
概要
本發明已構思解決上述問題且符合傳統要求。本發明之一目的係提供能改良成型性及於成型後維持優異反射特徵之一雙軸定向之聚酯反射膜,及其一製造方法。
本發明之上述及其它目的及優點由下列較佳例示實施例的說明會更明顯。
於一廣義方面,提供一雙軸定向之聚酯反射膜,其包括一光反射層,其具有於其內部之孔洞;及一支撐層,其係形成於此光反射層之至少一表面上,其中,此光反射層包含一聚酯組成物,其包括均聚酯、共聚物聚酯、與聚酯不相容之樹脂,及無機顆粒,此支撐層包含一聚酯組成物,其包括均聚酯、共聚物聚酯,及無機顆粒,且於其中心處內凹之多數個光收集結構係以一格子形狀配置,且一孔洞係於一凹部形成。
光反射層之聚酯組成物可滿足下列條件(1)至(3):
(1) 8體積%≤Vo+Vi≤20體積%
(2) 0.5≤Vo/Vi≤1.6
(3) 0.6≤(Vo+Vi)/Vc≤3
其中,當以聚酯組成物之100重量%為基準之每一組份的重量除以比重時,Vo表示與聚酯不相容之樹脂的體積%,Vi表示無機顆粒之體積%,且Vc表示共聚物聚酯之體積%。
雙軸定向之聚酯反射膜於200℃之貯存彈性模數E'可為40Mpa至100MPa。
共聚物聚酯可為藉由100莫耳%之作為一酸組份之芳香族二羧酸,總二醇組份之60至90莫耳%之乙二醇,及10至40莫耳%之選自由三亞甲基二醇、四亞甲基二醇、2,2二甲基(1,3-丙烷)二醇,及1,4-環己烷二甲醇所組成之一群組的一或多種元醇組份之一聚縮合反應而獲得之一聚合物。
與聚酯不相容之樹脂可為選自結晶性聚烯烴樹脂、非結晶性環狀烯烴樹脂、熱固性聚苯乙烯樹脂、熱固性聚丙烯酸酯樹脂、polypetylenesulfide樹脂,及氟系樹脂,或其等之一均聚物或共聚物之至少一者。
與聚酯不相容之樹脂的玻璃轉化溫度可為160℃或更高。
無機顆粒可包括選自由氧化矽、氧化鋁、硫酸鋇、二氧化鈦,及碳酸鈣所組成群組之至少一無機顆粒。
光反射層之無機顆粒的一平均顆粒直徑可為多於0.2μm且少於1.2μm。
支撐層之無機顆粒的一平均顆粒直徑可為多於0.1μm且少於10.0μm。
雙軸定向之聚酯反射膜的一總厚度係150μm至400μm。
支撐層之厚度可多於該光反射層之厚度的1.0 %且少於該光反射層之厚度的10.0%。
雙軸定向之聚酯反射膜的比重可為0.7至1.2g/cm3
。
使用一成型模具成型前後之於雙軸定向之聚酯反射膜的其中心處內凹之凹部的一中心部之一物理性質改變會滿足以下之條件(4)至(7):
(4) 成型前之光學密度(OD)>1.4
(5) 成型前後之OD減少>0.15
(6) 成型後之OD偏差>7%
(7) 成型前後之厚度(d)減少>30%。
於另一廣義方面,提供一製造雙軸定向之聚酯反射膜之方法,其包括乾燥一支撐層A之一聚酯組成物及一光反射層B之一聚酯組成物的每一者之一第一步驟;藉由熔融擠壓第一步驟之組成物製備一未經拉伸之片材之一第二步驟;藉由使未經拉伸之片材於一縱向單軸拉伸製備一經單軸拉伸之反射膜之一第三步驟;藉由使經單軸拉伸之反射膜於一橫向再次拉伸製備一經雙軸拉伸之反射膜之一第四步驟;於經雙軸拉伸之反射膜上實施熱處理之一第五步驟;將經熱處理之反射膜冷卻及捲繞之一第六步驟;使用一成型模具將於第六步驟製成之反射膜成型為其中多數個內凹光收集結構係以一格子形狀配置之一型式之一第七步驟;及形成(沖壓)孔洞以供將LED放置於在第七步驟製成之反射膜的內凹光收集結構中之一第八步驟。
詳細說明
以下,本發明之實施例將參考所附圖式作詳細說明,以便由熟習此項技藝者輕易實施。需瞭解本發明不被解釋為限於此處所述之實施例,且可以許多不同型式實施。
除非作其它定義,此處使用之所有技術及科學術語具有與本發明所屬技藝之普通技述者普遍瞭解相同之意義。於相矛盾之情況,包含定義之本說明書將掌控。
此外,雖然與此述所述者相似或相同之方法及材料可用於本發明之實施或測試,但適合之方法及材料係於此處作說明。
於此使用時,術語“包含”、“包括”、“含有”、“特徵在於”、“具有”,或此等之任何其它變異係打算涵蓋一非它性之包括。例如,包含一系列元件之一程序、方法、物件,或裝置並無需限制於此等元件,而可包括其它未明確列出或此程序、方法、物件,或裝置固有之其它元件。
再者,除非明確作相反陳述,“或”係指一包括性之或,而非一排它性之或。
於說明及/或主張本發明,術語“共聚物”係用以指藉由使二或更多種單體共聚合而形成之聚合物。此等共聚物包括二元共聚物、三元共聚物,或更高等級共聚物。
圖1係依據本發明一實施例之一雙軸定向之聚酯反射膜的一截面圖,圖2係依據本發明一實施例之雙軸定向之聚酯反射膜的一放大截面圖,圖3係依據本發明一實施例之雙軸定向之聚酯反射膜的一平面圖,且圖4係用於說明依據本發明一實施例之雙軸定向之聚酯反射膜之一成型方法的一圖。
參考圖1至3,依據本發明一方面之雙軸定向之聚酯反射膜10具有一多層結構,其包括其內具有孔洞24之一光反射層B,及形成於光反射層B的至少一表面上之一支撐層A,且具有將於以下說明之一結構及原料組成物。
如圖1至3所示,依據本發明一實施例之雙軸定向之聚酯反射膜10具有一結構,其中,多數個於中心處具有一凹部12之凹形光收集結構係以一格子形狀配置,且一孔洞13係於凹部12上形成。
凸部11及凹部12係依據下凹光收集結構的格子形狀重複地形成於反射膜上。藉由反射通過下凹光收集結構的光,使得光不會以所有方向散射,而是集中於中心,可使於局部調光期間一亮區域的反射光對一暗區域之作用達最小,藉此能對個別發光二極體(LED)作局部調光。
於圖3,矩形的下凹光收集結構係以一格子形狀配置,但此僅係一範例,且格子形狀不限於矩形,使得諸如圓形、橢圓形,及正六面形之各種格子形狀為可能。
依據本發明一實施例之雙軸定向之聚酯反射膜10可以支撐層A/光反射層B之一A/B二層結構製成,其中,支撐層A係僅形成於光反射層B之一表面上。此外,依據本發明一實施例之雙軸定向之聚酯反射膜10可以支撐層A/光反射層(B)/支撐層之一A/B/A三層結構製成,其中,支撐層A係形成於光反射層B之二表面上。例如,基於成膜穩定性、缺陷控制,及加工穩定性,A/B/A三層結構係較佳。於A/B二層結構之情況,於此膜形成時,作為一支撐層之支撐層A係僅形成於此膜之一表面上,因此諸如膜撕裂之加工缺陷會於膜加工方法中由於缺乏支撐層而發生,此會造成生產力減少。再者,具有於其內形成之孔洞24的光反射層B於另一表面上形成一表面層,使得孔洞24可能造成表面層上似火山口的外觀,且諸如破裂或凹痕之缺陷於二次加工期間,諸如,塗邊(bead-coating),或當反射膜被嵌入一背光單元時可於反射膜之表面上藉由24造成。反射膜表面上與一導光板之接觸表面的破裂或凹痕係高度可能發生。因此,更佳係依據本發明一實施例之雙軸定向之聚酯反射膜10的多層結構具有一支撐層A/光反射層B/支撐層A之一A/B/A三層結構。例如,圖2顯示以支撐層(A)/光反射層(B)/支撐層(A)之一A/B/A三層結構形成的一雙軸定向之聚酯反射膜10。
於一實施例,光反射層B可包含一聚酯組成物,其包含作為一表要組份之均聚酯,且包含一共聚物聚酯、具有與聚酯不相容性之樹脂23,及無機顆粒22。
再者,支撐層A可包含一聚酯組成物,其包含作為一主要組份之一均聚酯,且包括共聚物聚酯及無機顆粒。
均聚酯係藉由自一二羧酸與一二醇組份之一聚縮合反應獲得的一聚合物。較佳係單獨使用選自對苯二甲酸二甲酯、對苯二甲酸、間苯二甲酸、2,6-萘二羧酸、癸二酸、己二酸、二苯基二羧酸、5-第三丁基間苯二甲酸、2,2,6,6-四甲基二苯基-4,4-二羧酸、1,3-三甲基-3-苯基磷酸酯-4,5-二羧酸、5-鈉磺基間苯二甲酸、偏苯三甲酸、草酸、丙二酸、琥珀酸、戊二酸、棕櫚酸、壬二酸、苯均四酸、1,4-環己烷二羧酸、1,3-環己烷二羧酸等之一者作為一二羧酸組份,且更佳係使用對苯二甲酸二甲酯、對苯二甲酸,及選擇者。較佳係單獨使用選自乙二醇、三亞甲基二醇、四亞甲基二醇、2,2二甲基(1,3-丙烷)二醇、1,4-環己烷二甲醇等之一者作為二醇組份,且更佳係使用乙二醇。
此外,共聚物聚酯係於均聚酯組份間之藉由二或更多種二羧酸或二醇組份之一聚縮合反應而獲得之一聚合物。較佳係除了對苯二甲酸以外,另與間苯二甲酸、2,6-萘二羧酸等組合地使用作為一二羧酸組份,且作為二醇組份,較佳係使用除了乙二醇以外,另外與三亞甲基二醇、四亞甲基二醇、2,2二甲基(1,3-丙烷)二醇、1,4-環己烷二甲醇等組合而形成之一共聚物聚酯。
於一實施例,依據本發明之共聚物聚酯較佳係藉由100莫耳%之作為一酸組份之芳香酸二羧酸,總二醇組份之60至90莫耳%之乙二醇,及10至40莫耳%之選自由三亞甲基二醇、四亞甲基二醇、2,2二甲基(1,3-丙烷)二醇,及1,4-環己烷二甲醇所組成群組之一或多種二醇組份之一聚縮合反應而獲得之一聚合物。
與聚酯不相容之樹脂23較佳係選自結晶性聚烯烴樹脂、非結晶性環狀烯烴樹脂、熱固性聚苯乙烯樹脂、熱固性聚丙烯酸酯樹脂、polypetylenesulfide樹脂,及氟系樹脂,或其等之一均聚物或共聚物之至少一者,且更佳係一非結晶性環狀聚烯烴樹脂。
此外,與聚酯不相容之樹脂的玻璃轉化溫度Tg較佳係160℃或更高。當與聚酯不相容之樹脂的玻璃轉化溫度Tg少於160℃,於光反射層之孔洞中形成之與聚酯不相容之樹脂顆粒於高溫成型加工方法期間易變形,此會造成光反射性能惡化之一問題。
無機顆粒22較佳包括選自由氧化矽、氧化鋁、硫酸鋇、二氧化鈦,及碳酸鈣所組成群組之至少一無機顆粒,且更佳係一碳酸鈣顆粒。
此外,於無機顆粒中,用於光反射層B之無機顆粒22的平均顆粒直徑較佳係多於0.2μm且少於1.2μm。此係因為若用於光反射層B之無機顆粒的直徑係1.2μm或更多,藉由無機顆粒形成之一孔洞層的密度顯著減少,使得反射特徵明顯降級。若直徑係0.2μm或更少,於光反射層之分佈困難且易造成顆粒聚結。再者,當一經製備之聚酯反射膜於高溫接受壓製成型或真空壓縮成型,聚酯反射膜中之孔洞24變形藉由高溫及高壓而造成。於此情況,當無機顆粒的尺寸係0.2μm或更少,顆粒無法作為使膜內之孔洞24的改變達最小之一撐體,使得問題發生,因為於成型後,反射膜的比重上升且反射特徵明顯降級。
此外,於無機顆粒中,用於支撐層A的無機顆粒之平均顆粒直徑較佳係多於0.1μm且少於10.0μm,且更佳係多於1.0μm且少於5.0μm。此係因為若用於支撐層A的無機顆粒之尺寸係0.1μm或更少,此膜之運行性質(running property)於成膜方法中係明顯不足,使得大量刮痕於膜表面上產生。若顆粒尺寸係10.0μm或更多,諸如於拉伸方法期間之膜撕裂的加工缺陷會於成膜方法中藉由大尺寸的顆粒而造成。
於一實施例,反射層B之聚酯組成物包含作為一主要組份之均聚酯,且包括一共聚物聚酯、與聚酯不相容之一樹脂,及無機顆粒,其中,以100重量%之形成光反射層之聚酯組成物為基準,當共聚物聚酯、與聚酯不相容之樹脂,及無機顆粒之每一組份的重量除以比重時,下列條件(1)至(3)係較佳地被滿足,以便達成於高溫之成型性及成型後之優異反射特徵。
(1) 8體積%≤Vo+Vi≤20體積
(2) 0.5≤Vo/Vi≤1.6
(3) 0.6≤(Vo+Vi)/Vc≤3
此處,Vo表示與聚酯不相容之樹脂的體積%,Vi表示無機顆粒的體積%,且Vc表示共聚物聚酯的體積%。
以眾多實驗為基準,本發明之發明人確認當構成雙軸定向之聚酯反射膜的光反射層B之聚酯組成物中之均聚酯樹脂、共聚物聚酯樹脂、與聚酯不相容之樹脂,及無機顆粒的含量滿足上述條件時,壓製成型及真空壓縮成型前後之優異反射特徵及優異成型加工性於高溫達成。
即,如於以下之實施例及比較例中可確認般,當條件(1)之一數值少於8體積%,光反射層中之孔隙密度降低,且因而難以達成足夠光反射效率,且當此數值超過20體積%,許多孔洞(孔隙)於膜中形成,且因而拉伸性明顯降低,此可能於成膜期間造成加工缺陷,諸如,膜撕裂。
此外,當條件(2)之一數值少於0.5,反射膜於200℃之貯存彈性模數增加,使得此膜於成型加工期間會被撕裂或難以充份成型,且當此數值超過1.6,反射膜於200℃之貯存彈性模數降低,使得於成型加工期間之成型性增加,但是於膜厚度及光學密度之一急遽減少會因變形而造成。當壓製成型或真空壓縮成型於高溫實施,成型後之光學特徵惡化會因聚酯反射膜內之孔洞24由於高溫及高壓變形而造成。於此情況,無機顆粒作為使膜中孔洞改變達最小之一撐體。
再者,當條件(3)之一數值少於0.6,共聚物聚酯樹脂之相對含量增加,且因而於成膜方法期間之拉伸性增強,但是反射膜於200℃之貯存彈性模數E'減少,此會由於成型加工期間變形而造成膜厚度及光學密度急遽減少。當條件(3)之數值超過3,共聚物聚酯樹脂之相對含量減少,因此,反射膜於200℃之貯存彈性模數E'增加,且於成型加工期間,膜會被撕裂或充份成型會不被實施。
於一實施例,支撐層A之聚酯組成物可包含作為一主要組份之均聚酯,且包括一共聚物聚酯及無機顆粒,其中,以100重量%之總組成物為基準,共聚物聚酯的含量較佳係30.0重量%,且無機顆粒的含量係多於0.01重量%且少於20重量%。
當支撐層A之聚酯組成物中之共聚物聚酯的含量係30重量%或更多,支撐層之耐熱性惡化,且因而產生一問題,因為由於壓製加工或真空壓縮成型期間與一模具黏著,諸如剝離、凹痕、刮痕等之各種表面缺陷於膜表面上產生。
此外,當支撐層A之聚酯組成物中之無機顆粒的含量係0.01重量%或更少,具有一問題,因為由於成膜方法期間之不充份運行性質,大量之刮痕於膜表面上造成,且當無機顆粒的含量係20重量%或更多,膜撕裂等之一問題會於成膜方法之拉伸期間輕易發生。
於一實施例,反射膜於200℃之貯存彈性模數E'較佳係40MPa至100MPa。本發明製備之雙軸定向之聚酯反射膜當接受成型加工期間之於190℃或更高之一高溫的壓製成型或真空壓縮成型時,會由於高溫及高壓而變形。當反射膜於200℃之貯存彈性模數E'少於40MPa,成型加工性優異,但是聚酯反射膜中之孔洞24係易變形,且因此反射性能惡化。當反射膜之貯存彈性模數E'超過100MPa,成型加工期間之膜中孔洞改變達最小,但成型加工性惡化。
於一實施例,雙軸定向之聚酯反射膜的總厚度較佳係150μm至400μm。此係因為若反射膜之總厚度少於150μm,具有一問題,因為厚度太薄而於成型方法期間,成型加工性顯著減少或膜被撕裂。若反射膜之總厚度超過400μm,難以穩定製造,例如,破裂於聚酯反射膜形成方法期間發生,製造成本由於總厚度而增加,及一製得之液晶顯示器的總厚度增加,此使達成一超薄設計成為挑戰。
於一實施例,支撐層A的總厚度較佳係多於光反射層B總厚度之1.0%且少於10.0%。即,支撐層A與光反射層B間之厚度比例(支撐層A的厚度/光反射層B的厚度)*100%較佳係多於1.0%且少於10.0%。此係因為若支撐層A對光反射層B厚度之厚度比例係1.0%或更少,諸如膜撕裂的之加工缺陷於膜拉伸方法期間可能發生,因為支撐層A無法於成膜方法期間作為一充份撐體。若厚度比例係10.0%或更多,充份成型性於高溫反射膜成型方法期間無法獲得,因為其中未形成孔洞24之支撐層A太厚。
於一實施例,雙軸定向之聚酯反射膜的比重較佳係0.7至1.2g/cm3
。此係因為若反射膜的比重少於0.7g/cm3
,難以穩定製造,例如,由於成型加工期間之熱處理,破裂於聚酯反射膜形成方法期間發生,且尺寸穩定性顯著減少。若反射膜的比重超過1.2g/cm3
,製造成本增加,且反射特徵明顯惡化,因為孔洞未於聚酯反射膜之光反射層中充份形成。
然後,依據本發明另一方面之一製造雙軸定向之聚酯反射膜之方法將作說明。依據本發明一方面之上述雙軸定向之聚酯反射膜的多餘說明將被省略。
依據本發明另一方面之製造雙軸定向之聚酯反射膜之方法包括將一支撐層A之一聚酯組成物及一光反射層B之一聚酯組成物的每一者乾燥之一第一步驟,藉由將第一步驟之組成物熔融擠壓製備一未經拉伸之片材之一第二步驟,藉由將此未經拉伸之片材於一縱向單軸拉伸製備一經單軸拉伸之反射膜之一第三步驟,藉由將此經單軸拉伸之反射膜於一橫向再次拉伸製備一經雙軸拉伸之反射膜之一第四步驟,於此經雙軸拉伸之反射膜上實施熱處理之一第五步驟,將此經熱處理之反射膜冷卻及捲繞之一第六步驟,使用一成型模具將於第六步驟製成之反射膜成型為其中多數個內凹光收集結構係以一格子形狀配置之一型式之一第七步驟;及形成(沖壓)孔洞以供將LED放置於在第七步驟製成之反射膜的內凹光收集結構中之一第八步驟。
第一步驟係將支撐層A之聚酯組成物及光反射層B之聚酯組成物之每一者於每一乾燥器中於100℃至200℃之溫度乾燥,其中,存在於一樹脂中之水分藉由將組成物於高真空下乾燥3至10小時而移除。經由乾燥方法移除水分的原因係克服可能發生之一問題,因為若一聚酯樹脂藉由熔融擠壓方法期間之樹脂中的殘餘水分水解,片材成型於T型模具擠壓方法中係不好地實施,其係由於聚酯之熔融黏度快速減少,或者氣泡於一經排放之聚合物中產生,因而不可能成膜。
第二步驟係藉由將第一步驟之組成物熔融擠壓獲得一未經拉伸之片材,其中,支撐層A之經乾燥的聚酯組成物及光反射層B之經乾燥的聚酯組成物係使用具有一擠壓機A’及一擠壓機B’之共擠壓設備於250℃至300℃熔融擠壓,然後,引入一T字模多噴嘴內。於此T字模多噴嘴內,形成其中支撐層A係位於光反射層B之每一表面上的一A/B/A層狀結構,且一經熔融之樹脂使用一T字模及一鑄造鼓冷卻及固化,獲得未經拉伸之片材。
第三步驟係藉由將獲得的未經拉伸之片材於一縱向單軸拉伸製備一經單軸拉伸之膜,其中,未經拉伸之片材藉由加熱裝置,諸如,一滾輪加熱及藉由紅外線加熱器加熱,加熱至大於或等於聚酯樹脂之一玻璃轉化溫度的一溫度,然後,較佳地使用二或更多個滾輪之一周邊速度差拉伸三至五次。
第四步驟係藉由將經縱向單軸拉伸之膜於橫向再次拉伸製造一經雙軸拉伸之膜,其中,使用行進夾將一模於一寬度方向拉伸之稱為拉幅機的爐設備被用以使在第三步驟經縱向拉伸之膜於一爐內預熱至聚酯樹脂之玻璃轉化溫度加上50℃內之一溫度,於此爐內,形成多數個加熱區及多數個拉伸區,然後,此膜於相同溫度範圍內於一橫向拉伸三至五次。
第五步驟係實施熱處理,以確保於拉幅機內拉伸之膜的尺寸穩定性及定向鬆弛性,其中,熱處理係於相同拉幅機設備內形成之多數個熱處理區域內,於低於或等於聚酯之熔點加上30℃之一溫度實施。於此情況,為確保於熱處理方法中之高的尺寸穩定性及成型性質,經雙軸拉伸之膜於一橫向之定向鬆弛性及均一定向係必需,其可藉由下列方法實行。
當經一縱向及一橫向雙軸拉伸之膜於拉幅機中接受熱處理時,經橫向定向之鏈的鬆弛發生,其中於一寬度方向之一中心部於一橫向充份鬆弛,然而與夾子相鄰部份由於夾子而未能於一橫向充份鬆弛,使得一弓曲現象發生,其中,呈一弓狀之過度定向於拉幅機中發生。為克服此一現象,較佳係使其中弓曲現象嚴重發生之第四步驟的一橫向拉伸結束區與第五步驟之一熱處理開始區間之一溫差保持在30℃內。
此外,為了定向鬆弛,較佳係提供多數個熱處理區且藉由從一開始區至一結束區逐漸增加溫度而進行熱處理,熱處理開始區至熱處理結速區間之一溫差較佳係30℃至100℃,且熱處理結束區之溫度較佳係大於或等於聚酯的熔點。再者,當於一橫向額外拉伸0.05倍至0.5倍於熱處理區中實施,弓曲現象減緩,使得於一寬度方向之均一定向可被達成。
第六步驟係藉由使用在上述拉幅機內之多數個熱處理區域將經雙軸拉伸之膜穩定冷卻及捲繞,且一雙軸定向之聚酯反射膜可經由將經冷卻之膜捲繞之此步驟而獲得。
第七步驟係將於第六步驟製備之反射膜使用一成型模具200成型為其中多數個下凹光收集結構係以一格子形狀配置之一型式,其中係配置每一者於其中心處具有一凹部12之多數個光收集結構。經由此光收集結構,藉由反射膜反射之光不會於所有方向散射,而係以一中央集中形式反應,藉此,能使個別LED局部調光。於此情況,製備之雙軸定向之聚酯反射膜較佳係滿足圖4中所示之反射膜之一內角(壁角)及成型模具之一內角(壁角)的條件。此等內角的條件將參考於下描述之方程式1作詳細說明。
第八步驟係形成(沖壓)一孔洞13以供將一LED放置於第七步驟製備之反射膜的下凹光收集結構內,且孔洞13的形狀可為各種形狀,諸如,一圓形、一橢圓形、一長方形等,其係依LED的形狀而定,且較佳係一圓形。
經由上述方法製備之依據一實施例之雙軸定向之聚酯反射膜較佳係具有如下所示之技術特徵。
首先,於依據一實施例之雙軸定向之聚酯反射膜,使用成型模具成型前後於其中央處內凹之凹部12的中央部之物理性質改變(孔洞加工前)較佳係滿足以下之條件(4)至(7)。
(4) 成型前之光學密度(OD)>1.4
(5) 成型成後之OD減少>0.15
(6) 成型後之OD偏差>7%
(7) 成型前後之厚度(d)減少>30%
即,成型前之雙軸定向之聚酯反射膜的OD較佳係滿足超過1.4之一條件。當OD係1.4或更少,一透射率增加,使得足夠反射性能未被實現,因此,降低一製造之液晶顯示器的發光率(亮度)。此外,當比較製造反射膜之方法中的第七步驟之成型方法前後的OD,較佳係反射膜成型前後之OD減少滿足少於0.15。此係因為當成型前後之OD減少係0.15或更多,經成型之反射膜未提供足夠反射性能,因此具有製備之液晶顯示器的發光率(亮度)降低之相同缺點。再者,若於孔洞加工在成型後於其中央處內凹之凹部上實施前之每一凹部於中央部測得之OD偏差係7%或更多,可看到成型未於反射膜之整個表面上均一地實施,且具有一問題,因為製造之液晶顯示器的發光斑(亮度差)發生。此外,當成型前後之厚度減少係30%或更多,光反射層中之孔洞的形狀變形,使得經成型之反射膜未提供足夠反射性能,且膜的剛性惡化。
此處,WAm
表示一成型模具之一壁角,且WAr
表示成型後之一反射膜的一壁角。即,WAr
表示連接為成型後之反射膜10的至高點的一凸部11及反射膜10接觸成型模具200之一接觸點32的一假想線與反射膜10之凹部12間之一內角,且WAm
表示成型模具200之內角。
於依據一實施例之雙軸定向之聚酯反射膜,較佳係依據方程式1之成型模具200與反射膜10之內角間的一關係係滿足5%或更少。此係因為若方法式1之一數值超過5%,於減少經成型之反射膜中之多數個下凹光收集結構的尺寸係有限,且因此於放置多數個LED以增加局部調整之效率係有限。
以下,本發明之結構及因而獲得之功效將參考範例及比較例作詳細說明。但是,此等範例係提供用以更詳細地說明本發明,且本發明之範圍並不限於此等範例。
[範例]
[範例1]
一支撐層A係形成於一光反射層B之二側上而形成一反射膜,其中,此等層係以支撐層A/光反射層B/支撐層A之順序層合,且以250μm之總厚度為基準,支撐層A對光反射層B之厚度比例係5%。原料係設計成使得支撐層A具有89.9重量%之作為均聚酯之聚對苯二甲酸乙二酯(Toray Advanced Materials Korea Inc.,A9093),10重量%之共聚物聚酯(Eastman Chemical Company,GN071),及0.1重量%之作為無機顆粒之具有2.0μm之平均顆粒尺寸的二氧化矽之一組成物,且支撐層B具有63重量%之作為均聚酯之聚對苯二甲酸乙二酯(Toray Advanced Materials Korea Inc.,A9093),15重量%之共聚物聚酯(Eastman Chemical Company,GN071),8重量%之乙烯及降冰片烯之共聚樹脂,其係一非結晶性環狀烯烴共聚物(Polyplastics Co., Ltd.,Topas6017,Tg 170 ℃),作為與聚酯不相容之樹脂,及14重量%之作為無機顆粒之具有0.6μm之一平均顆粒尺寸之碳酸鈣顆粒之一組成物,且其後,擠擪機A'之支撐層A及擠壓機B'之光反射層B係以280度共擠壓成A/B/A層,且使用一T字模及一鑄造鼓冷卻及固化,獲得一未經拉伸之片材。
其後,一反射膜係以上述製造方法,藉由將未經拉伸之片材於一縱向以3.2倍及於一橫向以3.6倍作雙軸拉伸而製備。然後,一雙軸定向之聚酯反射膜係使用寬度200mm且長度300mm之一經製備的成型模具,以圖1所示之型式製備。此時,於預處理使用Asano Laboratories Co. Ltd.之一小真空壓縮成型機(FKS-0632-20)於200℃之一膜加熱溫度實施10秒之一加熱時間後,為與成型模具相同之形狀的一成型物件之雙軸定向之聚酯反射膜係經由真空壓縮成型製備。
[範例2至範例6]
雙軸定向之聚酯反射膜係以與範例1相同之方式製備,除了光反射層B中之構成材料的含量係如以下表1中所示般改變,且每一者係取作為範例2至範例6之每一者。
[比較例]
[比較例1至比較例6]
除了光反射層B之構成材料的含量係如以下表1中所示般改變,一雙軸定向之聚酯反射膜係以與範例1相同之方式製備,且每一者係取作為比較例1至比較例6之每一者。
[比較例7]
一雙軸定向之聚酯反射膜係以與範例1相同之方法製備,除了將範例1中之光反射層B中之與聚酯不相容之樹脂改變成具有150℃之Tg之一非結晶性環狀烯烴共聚物(Polyplastics Co., Ltd.,Topas6015,Tg 150 ℃)。
[比較例8]
一雙軸定向之聚酯反射膜係以與範例1相同之方法製備,除了支撐層A對光反射層B之厚度比例改變成0.7%。
[比較例9]
一雙軸定向之聚酯反射膜係以與範例1相同之方法製備,除了支撐層A對光反射層B之厚度比例改變成13%。
依據上述範例1至6及比較例1至9之雙軸定向之聚酯反射膜的構成材料及其等之含量係顯示於以下之表1中。
表1
光反射層組成物之體積條件 (體積%) | 均聚酯 (比重:1.4) | 共聚物聚酯 (比重:1.4) | 與聚酯不相容之樹脂 (比重:1.02) | 無機顆粒 (比重:2.71) | |||||||
Vo+Vi | Vo/Vi | (Vo+Vi) /Vc | 重量% | 體積% | 重量% | 體積% | 重量% | 體積% | 重量% | 體積% | |
範例1 | 13.0 | 1.52 | 1.14 | 63 | 45.00 | 15 | 11.36 | 8 | 7.84 | 14 | 5.17 |
範例2 | 14.1 | 0.53 | 1.24 | 55 | 39.29 | 15 | 11.36 | 5 | 4.90 | 25 | 9.23 |
範例3 | 19.0 | 1.06 | 1.26 | 45 | 32.14 | 20 | 15.15 | 10 | 9.80 | 25 | 9.23 |
範例4 | 8.3 | 0.89 | 0.73 | 69 | 49.29 | 15 | 11.36 | 4 | 3.92 | 12 | 4.43 |
範例5 | 13.4 | 1.42 | 2.94 | 71 | 50.71 | 6 | 4.55 | 8 | 7.84 | 15 | 5.54 |
範例6 | 13.4 | 1.42 | 0.63 | 49 | 35.00 | 28 | 21.21 | 8 | 7.84 | 15 | 5.54 |
比較例1 | 14.2 | 2.21 | 1.25 | 63 | 45.00 | 15 | 11.36 | 10 | 9.80 | 12 | 4.43 |
比較例2 | 13.1 | 0.43 | 1.16 | 56 | 40.00 | 15 | 11.36 | 4 | 3.92 | 25 | 9.23 |
比較例3 | 21.0 | 1.28 | 1.39 | 43 | 30.71 | 20 | 15.15 | 12 | 11.76 | 25 | 9.23 |
比較例4 | 7.6 | 1.06 | 0.67 | 71 | 50.71 | 15 | 11.36 | 4 | 3.92 | 10 | 3.69 |
比較例5 | 13.4 | 1.42 | 3.53 | 72 | 51.43 | 5 | 3.79 | 8 | 7.84 | 15 | 5.54 |
比較例6 | 13.4 | 1.42 | 0.48 | 40 | 28.57 | 37 | 28.03 | 8 | 7.84 | 15 | 5.54 |
比較例7 | 13.0 | 1.52 | 1.14 | 63 | 45.00 | 15 | 11.36 | 8 | 7.84 | 14 | 5.17 |
比較例8 | 13.0 | 1.52 | 1.14 | 63 | 45.00 | 15 | 11.36 | 8 | 7.84 | 14 | 5.17 |
比較例9 | 13.0 | 1.52 | 1.14 | 63 | 45.00 | 15 | 11.36 | 8 | 7.84 | 14 | 5.17 |
物理性質係使用依據實施例1至6及比較例1至9之雙軸定向之聚酯反射膜使用下列實驗例測量,且測量結果係顯示於以下之表2中。
[實驗例]
1.厚度測量
一經製備之雙軸定向之聚酯反射膜的厚度係依據日本標準協會(Japan Standards Association)之JIS C2151-2006測量,其係一用於電器用途之塑膠膜的測試方法。依據本發明之一雙軸定向之聚酯反射膜係使用一切片機於厚度方向切割,獲得一切片樣品。然後,支撐層A及光反射層B之厚度係藉由Hitachi, Ltd.製造之穿透式電子顯微鏡S800自放大250倍之切片樣品的一截面相片測量。
此外,於將經製備之雙軸定向之聚酯反射膜經由成型模具200成型加工之後,獲得一切片樣品,且以一格子形狀配置之多數個下凹光收集結構之每一者的一中央部的厚度以與如上所述相同之方法測量。
2.貯存彈性模數E'測量
為了測量經製備之雙軸定向之聚酯反射膜的貯存彈性模數E',依據本發明之雙軸定向之聚酯反射膜切成寬度16mm及長度5mm之一尺寸,獲得一切片樣品。其後,反射膜之貯存彈性模數E'使用一動態黏彈性測量裝置(DMA,TI Instruments,Q800),於30℃至220℃之溫度範圍,3℃/分鐘之加熱速率,1.0%之應變,及0.05N之靜力的條件下測量。
3. 光學密度(OD)測量
經製備之雙軸定向之聚酯反射膜的OD係使用GertagMacbeth製造之一光密度計(Gretag D200-II)測量。以一格子形狀配置之多數個下凹光收集結構之中央部的每一者於使用一成型模具成型之前及經由成型模具200之成型方法之後作測量。
4. 比重測量
經製備之雙軸定向之聚酯反射膜切成10cm x 10cm之一尺寸,然後,一樣品之重量藉由具有0.1mg之準確度的一電子秤(Mettle製造之AC100)精確稱重。其後,一平均值藉由以一靜壓厚度計測量經稱重之樣品的10點厚度而獲得,一比重係藉由下列方程式計算。
比重 = 膜重量(g)/膜厚度(um)*100
5. 內角測量
經製備之雙軸定向之聚酯反射膜的形狀及尺寸係藉由Keyence製造之三維表面形狀測量儀器(VR-3200)測量。
6. 成膜穩定性測量
成膜穩定性係依據下列標準評估。
○:成膜係穩定地實施6小時或更久且無膜破裂。
X:膜破裂於6小時內發生。
表2
支撐層之厚度比例 (%) | 方程式1 (%) | 於200 ℃之E’ | 比重 | 成型後之厚度降低 (%) | 成型前之OD | 成型後之OD | 成膜穩定性 | |||
(Mpa) | 平均 | 平均 | 減少 | 偏差 (%) | ||||||
範例1 | 5% | 2 | 54 | 0.80 | 21% | 1.65 | 1.56 | -0.09 | 3.3 | O |
範例2 | 5% | 4 | 96 | 0.75 | 16% | 1.71 | 1.65 | -0.06 | 1.2 | O |
範例3 | 5% | 3 | 83 | 0.70 | 27% | 1.75 | 1.62 | -0.13 | 3.2 | O |
範例4 | 5% | 3 | 77 | 0.95 | 19% | 1.45 | 1.38 | -0.07 | 3.8 | O |
範例5 | 5% | 4 | 91 | 0.80 | 13% | 1.69 | 1.64 | -0.05 | 1.2 | O |
範例6 | 5% | 2 | 42 | 0.85 | 24% | 1.62 | 1.49 | -0.13 | 4.9 | O |
比較例1 | 5% | 1 | 26 | 0.7 | 36% | 1.68 | 1.5 | -0.18 | 7.6 | O |
比較例2 | 5% | 22 | 107 | 0.8 | 11% | 1.70 | 1.68 | -0.02 | 1.2 | O |
比較例3 | 5% | 3 | 79 | 0.65 | 45% | 1.77 | 1.58 | -0.19 | 1.9 | X |
比較例4 | 5% | 22 | 121 | 1.15 | 7% | 1.38 | 1.28 | -0.04 | 4.7 | O |
比較例5 | 5% | 17 | 103 | 0.8 | 17% | 1.68 | 1.60 | -0.08 | 1.3 | X |
比較例6 | 5% | 1 | 36 | 0.85 | 53% | 1.57 | 1.33 | -0.24 | 8.4 | O |
比較例7 | 5% | 1 | 34 | 0.80 | 38% | 1.65 | 1.39 | -0.26 | 8.1 | O |
比較例8 | 0.7% | 1 | 42 | 0.78 | 28% | 1.67 | 1.57 | -0.05 | 3.9 | X |
比較例9 | 13% | 12 | 86 | 0.82 | 14% | 1.61 | 1.56 | -0.05 | 2.4 | O |
如由表2中可看出,確認依據本發明之範例1至6的雙軸定向之聚酯反射膜具有優異之成型性、光反射特徵,及成膜穩定性,與低成型變化。
相反地,比較例1於條件(2)具有2.21之一數值,因此未滿足條件(2),於其中,有關於光反射層組成物之組份的體積%之一數值需為1.6或更少。即,相比於與聚酯不相容之樹脂,含有之無機顆粒的體積%係小,因此反射膜於200℃之貯存彈性模數E'降低,此會造成此膜於高溫成型期間輕易變形。因此,此膜於一成型方法期間會被撕裂,或其厚度明顯降低及OD於成型後減少,使得足夠之反射性能不能被實行,因此降低一經製造之顯示器的發光率。此外,具有成型後之OD偏差增加的問題,因為均一成型於此成型方法無法達成。
再者,比較例2於條件(2)具有0.43之一數值,因此,未滿足條件(2),於其中,有關於光反射層組成物之組份的體積%之一數值需為0.5或更多。即,相較於無聚酯不相容之樹脂,含有的無機顆粒之體積%係大,因此,反射膜於200℃之貯存彈性模數E'增加,因而,此膜於以一成型模具高溫成型成一格子形狀之下凹反射結構的方法中難以變形。再者,以方程式1計算之一數值係22%,此未滿足需使此數值為5%或更少之條件,因此,成型性顯著降低,變得以形成一合意的成型物件,因此,於放置多數個LED以改良局部調光的效率加諸了限制。
此外,比較例3於條件(1)具有21體積%之一數值,且因此未滿足條件(1),於其中,有關於光反射層組成物之組份的體積%之一數值需為20體積%或更少。即,包含一大體積%之與聚酯不相容之樹脂及無機顆粒,因此,於光反射層中之孔洞密度於成膜期間增加,此造成拉伸性快速降低及高度可能之加工缺陷,諸如,光反射膜撕裂。再者,由於低比重,厚度降低會於成型方法中發生,因此,可能發生成型後OD降低的一問題。
比較例4於條件(1)具有7.6體積%之一數值,因此,未滿足條件(1),於其中,有關於光反射層組成物之組份的體積%之一數值需為8體積%或更多。即,含有一小體積%之與聚酯不相容之樹脂及無機顆粒,孔洞於反射膜之成膜方法期間未充份形成,使得比重增加及於200℃之貯存彈性模數E'增加。因此,此膜於以一成型模具高溫成型成一格子形狀之下凹反射結構的方法中難以變形,且以方程式1計算之成型性明顯降低,變得難以形成一合意之成型物件。
再者,比較例5於條件(3)具有3.53之一數值,因此未滿足條件(3),於其中,有關於光反射層組成物之組份的體積%之一數值需為3或更少。即,共聚物聚酯樹脂之體積%係比與聚酯不相容之樹脂及無機顆粒之體積%更低,因此,結晶化於反射膜之成膜方法未被充份抑制,此於拉伸方法造成拉伸性快速降低及高度可能之加工缺陷,諸如,光反射膜撕裂。再者,因為貯存彈性模數E'增加,此膜於以一成型模具高溫成型為一格子形狀之下凹反射結構的方法係難以變形。再者,以方程式1計算之一數值係17 %,此未滿足此數值需為5%或更少之條件,因此,成型性明顯降低,變得難以形成一合意之成型物件。
此外,比較例6於條件(3)具有0.48之一數值,因此未滿足條件(3),於其中,有關於光反射層組成物之組份的體積%之一數值需為0.6或更多。即,共聚物聚酯樹脂之體積%係比與聚酯不相容之樹脂及無機顆粒之體積%更高,因此,結晶化被充份抑制,但反射膜於200℃之貯存彈性模數E'降低,使得此膜於高溫成型期間易變形。因此,此膜於一成型方法期間會被撕裂,或其厚度明顯降低且OD於成型後減少,使得充分反射性能不能被實行,因此,降低一經製造之顯示器的發光率。此外,具有成型後之OD偏差增加的問題,因為均一成型於成型方法未被達成。
比較例7於光反射層組成物中使用與聚酯不相容之樹脂的具有150℃之玻璃轉化溫度(Tg)之非結晶性環狀烯烴共聚物,此未滿足其中Tg係160℃或更高之條件。與形成於光反射層中孔洞中的聚酯顆粒不相容之樹脂於高溫之成型加工方法中易變形,使得厚度顯著降低且OD於成型後減少,因此,充足反射性能無法被實行,因此降低一經製造之顯示器的發光率。此外,具有成型後之OD偏差增加的問題,因為均一成型於成型方法中未達成。
於比較例8,支撐層A對光反射層B之一厚度比例係0.7%,此未滿足其中支撐層A對光反射層B之厚度比例超過1%之一條件。因此,於反射膜之膜形成方法中,此膜於拉伸期間未被充份支撐,因此,拉伸性快速降低,且諸如光反射膜撕裂之加工缺陷發生。
於比較例9,支撐層A對光反射層B之一厚度比例係13%,此未滿足其中支撐層A對光反射層B之厚度係少於10%之條件,且藉由方程式1計算之一數值係12%,此未滿足此數值需為5%或更少之一條件。因此,成型性大量降低,因此,變得難以形成一合意之成型物件。
如上所述,依根據依據本發明一實施例之雙軸定向之聚酯反射膜及其製造方法,經由一反射膜之多層設計、修改原料、調整與聚酯不相容之樹脂的熱性質及無機顆粒之體積比例、定向鬆弛製造方法等,可獲得於厚度未明顯降低且即使於成型後亦維持優異反射特徵之一雙軸定向之聚酯反射膜。因此,此反射膜可用於各種應用,且特別地,確認此反射膜可適於作為用於局部調光之反射膜。
依據本發明,優異之成型性、光反射特徵、成膜穩定性,及成型偏差係於成型前後實現。
此外,本發明可應用於一用於使液晶顯示器局部調光之反射膜。
但是,本發明之功效不限於上述功效,且於上未提及之其它功效熟習此項技藝者由先前說明會係明顯。
多個範例已於上作說明。然而,需瞭解可作各種修改。例如,若所述技術以一不同順序實施及/或若一所述系統、結構、裝置,或電路中之組份以一不同方式組合及/或以其它組份或其等之等化物替代或補充,適合結果可被達成。因此,其它實施係於以下申請專利範圍之範圍內。
10:反射膜
11:凸部
12:凹部
13:孔洞
22:無機顆粒
23:與聚酯不相容之樹脂
24:孔洞
200:成型模具
A:支撐層
B:光反射層
圖式簡要說明
圖1係依據本發明一實施例之一雙軸定向之聚酯反射膜的一截面圖。
圖2係依據本發明一實施例之雙軸定向之聚酯反射膜的一放大截面圖。
圖3係依據本發明一實施例之雙軸定向之聚酯反射膜的一平面圖。
圖4係用於說明依據本發明一實施例之雙軸定向之聚酯反射膜之一成型方法的一圖。
10:反射膜
11:凸部
12:凹部
Claims (18)
- 一種雙軸定向之聚酯反射膜,其包含:一光反射層,其具有於其內部之孔洞;及一支撐層,其係形成於該光反射層之至少一表面上,其中,該光反射層包含一聚酯組成物,其包括均聚酯、共聚物聚酯、與聚酯不相容之樹脂,及無機顆粒,該支撐層包含一聚酯組成物,其包括均聚酯、共聚物聚酯,及無機顆粒,且於其中心處內凹之多數個光收集結構係以一格子形狀配置,且一孔洞係於一凹部形成。
- 如請求項1所述的雙軸定向之聚酯反射膜,其中,該雙軸定向之聚酯反射膜於200℃之貯存彈性模數E'係40Mpa至100MPa。
- 如請求項1所述的雙軸定向之聚酯反射膜,其中,該共聚物聚酯係藉由100莫耳%之作為一酸組份之芳香族二羧酸,總二醇組份之60至90莫耳%之乙二醇,及10至40莫耳%之選自由三亞甲基二醇、四亞甲基二醇、2,2二甲基(1,3-丙烷)二醇,及1,4-環己烷二甲醇所組成之一群組的一或多種二醇組份之一 聚縮合反應而獲得之一聚合物。
- 如請求項1所述的雙軸定向之聚酯反射膜,其中,與聚酯不相容之該樹脂係選自結晶性聚烯烴樹脂、非結晶性環狀烯烴樹脂、熱固性聚苯乙烯樹脂、熱固性聚丙烯酸酯樹脂,及氟系樹脂,或其等之一均聚物或共聚物之至少一者。
- 如請求項5所述的雙軸定向之聚酯反射膜,其中,與聚酯不相容之該樹脂的玻璃轉化溫度係160℃或更高。
- 如請求項1所述的雙軸定向之聚酯反射膜,其中,該等無機顆粒包括選自由氧化矽、氧化鋁、硫酸鋇、二氧化鈦,及碳酸鈣所組成群組之至少一無機顆粒。
- 如請求項1所述的雙軸定向之聚酯反射膜,其中,該光反射層之該等無機顆粒的一平均顆粒直徑係多於0.2μm且少於1.2μm。
- 如請求項1所述的雙軸定向之聚酯反射膜,其中,該支撐層之該等無機顆粒的一平均顆粒直徑係多於0.1μm且少於10.0μm。
- 如請求項1所述的雙軸定向之聚酯反射膜,其中,該雙軸定向之聚酯反射膜的一總厚度係150μm至400μm。
- 如請求項1所述的雙軸定向之聚酯反射膜,其中,該支撐層之一厚度係多於該光反射層之一厚度的1.0%且少於該光反射層之一厚度的10.0%。
- 如請求項1所述的雙軸定向之聚酯反射膜,其中,該雙軸定向之聚酯反射膜的比重係0.7至1.2g/cm3。
- 如請求項1至12中任一項所述的雙軸定向之聚酯反射膜,其中,使用一成型模具成型前後之於該雙軸定向之聚酯反射膜的其中心處內凹之該凹部的一中心部之一物理性質改變滿足以下之條件(4)至(7):(4)成型前之光學密度(OD)>1.4 (5)成型前後之OD減少<0.15(6)成型後之OD偏差<7%(7)成型前後之厚度(d)減少<30%。
- 一製造雙軸定向之聚酯反射膜之方法,該方法包含:乾燥一支撐層A之一聚酯組成物及一光反射層B之一聚酯組成物的每一者之一第一步驟;藉由熔融擠壓該第一步驟之該等組成物製備一未經拉伸之片材之一第二步驟;藉由使該未經拉伸之片材於一縱向單軸拉伸製備一經單軸拉伸之反射膜之一第三步驟;藉由使該經單軸拉伸之反射膜於一橫向再次拉伸製備一經雙軸拉伸之反射膜之一第四步驟;於該經雙軸拉伸之反射膜上實施熱處理之一第五步驟;將該經熱處理之反射膜冷卻及捲繞之一第六步驟;使用一成型模具將於該第六步驟製成之該反射膜成型為其中多個內凹光收集結構係以一格子形狀配置之一型式之一第七步驟;及形成(沖壓)孔洞以供將LED放置於在該第七步驟製成之該反射膜的該等內凹光收集結構中之一第八步驟。
- 如請求項15所述的方法,其中,使用一成型模具成型前後之於該雙軸定向之聚酯反射膜的其中心處內凹之該凹部的一中心部之一物理性質改變滿足以下之條件(4)至(7):(4)成型前之光學密度(OD)>1.4(5)成型前後之OD減少<0.15(6)成型後之OD偏差<7%(7)成型前後之厚度(d)減少<30%。
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TW201410465A (zh) * | 2012-07-30 | 2014-03-16 | Toray Industries | 液晶顯示器用白色聚酯薄膜 |
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US20220161534A1 (en) | 2022-05-26 |
CN113646670A (zh) | 2021-11-12 |
KR20200115903A (ko) | 2020-10-08 |
WO2020197049A3 (ko) | 2020-12-24 |
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