TW527507B - White film for surface light source - Google Patents
White film for surface light source Download PDFInfo
- Publication number
- TW527507B TW527507B TW090116848A TW90116848A TW527507B TW 527507 B TW527507 B TW 527507B TW 090116848 A TW090116848 A TW 090116848A TW 90116848 A TW90116848 A TW 90116848A TW 527507 B TW527507 B TW 527507B
- Authority
- TW
- Taiwan
- Prior art keywords
- white
- light source
- film
- surface light
- patent application
- Prior art date
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- Y10T428/31786—Of polyester [e.g., alkyd, etc.]
Description
527507 五、發明説明(1 ) [技術領域] 本發明係相關面光源反射元件所使用之白色薄膜。更詳 言之,係指液晶畫面用之邊緣照明及正下方型照明之面光 源反射板、及反射器用元件,即便長期使用,亮度亦不致 降低的白色薄膜。 [技術背景] 按,液晶畫面之照明用器材,廣泛的使用由導光板邊緣 之冷陰極射線管作爲照明光源,即所謂的邊緣照明光方式 (日本特開昭63 - 621 04號公報)。在此照明方法中,爲求更 有效率的應用光,可在冷陰極射線管周圍設置反射器,更 爲求使導光板所擴散的光,更有效率地產生反射,而在導 光板下設置反射板。藉此,便可降低冷陰極射線管光的外 漏,而增加液晶畫面亮度的功效。此外,近年在如液晶電 視之類的大畫面用中,因爲邊緣照明光方式在畫面高亮度 化上並不甚理想,因此便改採用正下方型照明光方式。此 方式係在液晶畫面的下面,並排設置冷陰極射線管,並在 反射板上平行並排冷陰極射線管。反射板係呈平面狀者, 而冷陰極射線管之其中部分則形成半圓凹狀等方式。 採用此類液晶畫面之面光源的反射器或反射板(統稱爲 「面光源反射元件」),講求較高的反射功能,並單獨使 用添加有白色染料、白色顏料的薄膜或內部含細微氣泡 的薄膜,亦或者將該等薄膜貼合於金屬板、塑膠板等之後 再供使用。特別係當使用內部含細微氣泡之薄膜的情況時 527507 五、發明説明(2 ) ’因爲具可提升亮度的效果,及均勻性佳的優點,所以被 廣泛的使用。此類內部含有細微氣泡的薄膜,己揭示於曰 本特開平6-322153號公報、特開平7-118433號公報等 中。 近年,液晶畫面的使用用途有明顯的擴大,除習知採用 筆記型電腦之外,其他尙有廣泛的使用於桌上型電腦、液 晶電視、行動電話顯不器、各種遊戲機等。隨此類的擴大 ,便期待畫面高亮度化、高精細化,而照明光源亦必需改 善高輸出化或增加光源照明數目等。再者,如液晶電視之 類的大畫面,因爲必需配合長時間使用等要求,所更需講 求高亮度與耐久性。特別係在使用正下方型光源時,直接 牴觸於光源所發射出的光,因此必須講求更高度的反射板 耐久性。惟,使用習知薄膜的反射器或反射板,當經長時 間使用過後,便將隨薄膜的劣化,而變黃,造成反射特性 降低,而導致畫面亮度降低的問題發生。 本發明有鑑於上述諸項問題,爲解決上述問題’其目的 在於提供一種即便經長時間使用,亦可亮度亦不致隨時間 變化而降低,可長期保持高畫質影像的面光源反射用元 件。 [發明揭示] 緣是,本發明爲解決上述課題,係將在內部含氣泡之白 色薄膜的至少一面上設置含光安定劑的塗佈層,爲面光源 反射元件用白色薄膜的骨架者。 [圖式簡單說明] -4- 527507 五、發明説明(3 ) 第1圖係一用於測量本發明面光源亮度的裝置構造之縱 向剖面示意圖。 [發明實施較佳態樣] 本發明中所謂的白色薄膜係指在熱可塑性塑膠薄膜中, 添加有機、無機染料、微粒子等者;或在構成薄膜的樹脂 成分中,混合與該樹脂成分非相溶性樹脂、及/或有機或 無機粒子,並進行熔融擠出之後,至少朝其中一方向拉伸 ,而於內部形成細微氣泡者;或添加發泡性粒子,利用熔 融擠出而發泡者;注入如碳酸氣等氣體,並進行擠出發泡 等,僅需在外觀視覺上具白色性者便可,並無特別的限制 。在本發明用途中,就提昇反射率,並提昇亮度而言,最 好爲在構成薄膜之樹脂成分中,混合入與該樹脂成分非相 溶性樹脂、及/或有機或無機粒子,並進行熔融擠出之後 ,至少朝其中一方向拉伸,而於內部形成細微氣泡者。更 以在內部形成細微氣泡之薄膜的至少一面上,與添加有機 或無機微粒子之熱可塑性樹脂共同擠壓出等方法而進行疊 層’並更進一步進行拉伸,使表層部產生較內層部更細微 氣泡之複合薄膜者爲更佳。 構成薄膜之熱可塑性樹脂,僅需利用熔融擠出可形成薄 膜者的話便可,其餘並無特別的限制,較佳的例子,則有 如聚酯類、聚烯烴類、聚醯胺類、聚胺甲酸酯類、聚苯硫 醚類等。特別在本發明中,就尺寸穩定性或機械特性佳, 且在可見光線區域中幾乎無吸收存在的觀點而論,最好採 用聚酯類。 527507 五、發明説明(4) 聚酯類的具體例,有如聚對酞酸乙二酯(以下簡稱PET) 、聚2,6-萘二甲酸乙二酯(以下簡稱PEN)、聚對酞酸丙二 酯、聚對酞酸丁二酯、聚對酞酸1,4 -伸環己基二甲酯等。 當然該等聚酯類亦可爲均聚物或寡聚物’但最好爲均聚物 。共聚物之情況時的共聚合成分,有如芳香族二羧酸、脂 肪族二羧酸、脂環族二羧酸、碳數2〜1 5之二醇成分。該 等例子,有如異酞酸、己二酸、癸二酸、酞酸、含磺酸鹽 基之異酞酸、及該等酯類形成性化合物、二乙二醇、三乙 二醇、新戊二醇、分子量400〜2萬之聚伸烷二醇等。 該等聚酯類中,在不妨礙本發明功效之前提下,亦可添 加如耐熱安定劑、耐酸安定劑、有機滑劑、有機、無機微 粒子、耐光劑、抗靜電劑、核劑、偶合劑等各種添加劑。 以下,針對本發明較佳例之使用聚酯類爲白色薄膜底材 的例子,進行詳細說明。採用聚酯類爲底材,在白色化上 ,雖有添加各種白色染料、白色顏料的方法,及如上述使 內部含細微氣泡的方法等,但就本發明之功效更加顯著顯 現上,最好採用使內部含細微氣泡的方法。此類使含細微 氣泡的方法,有如·· (1)使含發泡劑,並利用擠出時或製膜時的熱量而發泡 '或利用化學分解而發泡的方法;(2)在擠出時或在擠出 後’添加如二氧化碳氣體等氣體或可氣化的物質,而使之 發泡的方法;(3)添加與聚酯成分相溶性的熱可塑性樹脂 ’經熔融擠出後,再利用單軸或雙軸的拉伸方法;(4 )添 加有機或無機微粒子,經熔融擠出後,再利用單軸或雙軸 527507 五、發明説明(5 ) 的拉伸方法等。在本發明中,最好利用形成細微氣泡,而 增加反射界面。若由此論點,最好採用上述(3 )或(4 )之方 法。 利用上述方法所獲得氣泡的大小(厚度方向截面積尺寸) 爲0.5//m2〜50/ζγώ2,尤以Ι/zm2〜30//m2在亮度提昇上具 較優勢。另,氣泡之截面形狀雖可爲圓形、橢圓形中任一 者,但最好由薄膜上面至下面之間的全部面內,均至少存 在1個氣泡的構造。即,當作爲反射板時,由光源所發射 出光,雖由薄膜表面射入,但最好採此入射光利用內部氣 泡而全部反射的型態。實際上,亦有光穿過薄膜內部,此 部份便形成損耗,所以爲將其覆蓋,便可在入射光端(光 源端)相反面的薄膜面上,施行鋁、銀等金屬蒸鍍。另, 在減少內部含細微氣泡之薄膜的光損耗上,最好在含該氣 泡的聚酯薄膜表面上,設置利用有機或無機微粒子而含細 微氣泡的層。此表面層,係在聚酯樹脂中含有機或無機微 粒子,並於製造該內部含氣泡之薄膜時,同時進行擠出而 複合化後,再至少利用一方向的拉伸處理而製得。另,表 層氣泡,就亮度的觀點而言,最好小於內層氣泡。其比率 (表層氣泡大小/內層氣泡大小)並無特別的限制,但最好 爲0.05〜0.8,尤以〇.〇7〜0.7者爲佳,更以0. 1〜0.6者 爲更佳。氣泡的大小’可利用所添加粒子的大小而進行 控制。 此處,針對在爲形成氣泡而所添加的具與聚酯樹脂不相 溶性樹脂,以及添加於內層、表層中的有機或無機微粒子 527507 五'發明説明(6) ’進行詳細說明。具與聚酯樹脂不相溶性樹脂(以下簡稱 「非相溶性樹脂」),係指除聚酯以外的熱可塑性樹脂, 且呈粒子狀的分散於聚酯中。舉其例而言,最好爲聚乙烯 、聚丙烯、聚丁烯、聚甲基戊烯等聚烯烴樹脂、聚苯乙烯 、聚丙烯酸樹脂、聚碳酸樹脂、聚丙烯腈樹脂、聚苯硫醚 樹脂、氟化樹脂等。該等可爲單獨聚合物,亦可爲共聚合 物’亦可合倂二種以上使用。特別係與眾酯類之臨界表面 張力差較大,且較不易隨拉伸後的熱處理而變形的樹脂, 尤其以聚烯烴系樹脂爲佳,其中尤以聚甲基戊烯爲佳。非 相溶性樹脂在白色薄膜中的含量並無特別的限制,僅需在 考量製膜時的破裂、隨以非相溶性樹脂爲核所氣泡形成的 亮度之前提下進行選擇便可,通常爲3〜35重量%,尤以4 〜30重量%爲佳,更以5〜25重量%範圍內者爲佳。若低於 3重量%的話,則亮度提昇效果將較小,反之,若超過35重 量%的話,在製膜時便將容易造成薄膜破裂。 添加於內層及/或表層中的無機微粒子,最好以其本身 爲核而形成氣泡者,譬如碳酸鈣、碳酸鎂、碳酸鋅、碳 酸鈦(銳鈦礦型、金紅石型)、氧化鋅、硫酸鈀、硫化鋅、 鹼基性碳酸鉛、雲母鈦、氧化銻、氧化鎂、磷酸鈣、矽石 、鋁土、雲母、滑石、高嶺土等。該等之中,尤以使用在 400〜7 OOnm的可見光區域中吸收較少的碳酸鈣、碳酸鈀者 爲佳。若在可見光區域中具吸收的話,便將產生降低亮度 的問題。在有機微粒子之情況時,最好爲不致隨熔融擠出 而熔融者,尤其以交聯苯乙烯、交聯丙烯醯基等交聯微粒 527507 五、發明説明(7) 子爲佳。另,有機微粒子亦可採用中空狀者。上述微粒子 可單獨使用亦可合倂二種以上共同使用。上述微粒子的粒 徑雖無特別的限制,但通常在〇 . 05〜1 5 // m,最好在〇 . 1〜 1 0 // m,尤以在〇 . 3〜5 // m爲佳。若低於0 . 〇 5 // m的話,貝[] 氣泡形成性將不足,反之,若超過1 5 // m的話,則表面上 便必需進行所需以上的粗面化,故均不爲喜好。當表層含 微粒子,而內層含非相溶樹脂之情況時,以該微粒子爲核 的氣泡徑,若小於內層所形成氣泡徑,就亮度觀點而言屬 較佳者。再者,上述微粒子在白色薄膜中的含量最好爲1 〜30重量%,尤以2〜25重量%爲佳,更以3〜20重量%爲更 佳。若含量低於1重量%的話,亮度提昇效果將較小,反 之,若超過30重量%的話,在製膜時將容易產生薄膜破 裂。 屬此類含氣泡之白色薄膜的氣泡含率標準的比重,最好 在0 . 1以上且1 . 3以下者。當比重低於0 . 1時,作爲薄膜 的機械強度將不足,而產生容易折斷造成處理性惡化等的 問題發生。反之,若超過1 . 3時,氣泡含率將過低,而產 生反射率降低且亮度不足的傾向。另,當構成薄膜之熱可 塑性樹脂係採用聚酯類之情況時,比重的下限,最好爲0.4 。當比重低於〇 . 4時,氣泡含率將過高,而可能造成在製 膜時,容易產生破裂等問題發生。 所謂面光源反射元件,係指組合於如前述爲將光反射之 面光源中的板狀基材,具體而言,意指如液晶畫面用邊緣 照明光反射板、正下方型照明光之面光源反射板、及冷陰 -9- 527507 五、發明説明(8) 極射線管周圍之反射器等。當採用此面光源反射元件時, 就畫面色調觀點而論,反射板以白色度較高者爲佳,或在 配色上藍色較黃色爲多者爲佳。在考慮此點的前提下,最 好在白色薄膜中添加螢光增白劑。螢光增白劑可適當的使 用市售者,譬如"優比打克"(汽巴嘉基公司產製)、0B-1( 尹舒脫曼(公司名,音譯)公司產製)、ΤΒ0 (住友精化公司 產製)、”凱克魯"(商品名,音譯)(日本曹達公司產製)、 "開阿特"(商品名,音譯)(日本化藥公司產製)、M里擴普" (商品名,音譯)EGM(苦拉得甲奔(公司名,音譯)公司產 製)等。白色薄膜中螢光增白劑的含量,最好爲0.005〜1 重量%,尤以0.00 7〜0.7重量%爲佳,更以0.01〜0.5重 量%範圍內者爲更佳。若低於0.005重量%的話,則效果將 變小,反之若高於1重量%的話,則將產生黃色拖帶,故不 爲所好。當白色薄膜屬複合薄膜之情況時,將螢光增白劑 添加於表層上,更爲有效。 在本發明中,必需在此種白色薄膜至少一面上,設置含 光安定劑的塗佈層。光安定劑係可採用指如受阻胺系、水 楊酸系、二苯基酮系、苯並三唑系、氰基丙烯酸系、三系 、苯甲酸酯系、草酸劑、或溶膠凝膠等無機系光安定劑。 特別適用的光安定劑之具體例,雖有如下所示,當然並不 僅限於此。 受阻胺系:雙(2,2,6 , 6 -四甲基-4 -哌啶基癸二酸酯、 琥珀酸二甲酯· 1 - ( 2 -羥乙基)-4 -羥基-2 , 2,6,6 -四甲基哌 啶縮聚物; -10- 527507 五、發明説明(9) 水楊酸系:對第三丁基苯水楊酸酯、對第三辛基苯水楊 酸酯; 二苯基酮系:2,4 -二羥基二苯基酮、2 -羥基-4-甲氧基 二苯基酮、2 -羥基-4-甲氧基-5-磺基二苯基酮、2,2\4, 4·-四羥基二苯基酮、2,2'-二羥基-4-甲氧基二苯基酮、 2, 2'-二羥基-4,4’-二甲氧基二苯基酮、雙(2 -甲氧基- 4-羥基-5 -苯醯基苯)甲烷; 苯並三唑系:2 - ( 2 '-羥基-5 ’ -甲基苯)苯並三唑、2 - ( 2 1 -羥基-5、第三丁基苯)苯並三唑、2-(2^羥基- 3',5'-二-第三丁基苯)苯並三唑、2-(2’-羥基-3^第三丁基- 5’-甲 基苯)-5-氯化苯並三唑、2-(2、羥基-3’,5’-二-第三丁 基苯卜5 -氯化苯並三1:1坐、2-(2'-經基-5^第三辛基苯)苯 並三唑、2-(2'-羥基-3’,5^二-第三戊基苯)苯並三唑、 2,2'-甲叉雙[4-(1,1,3,3-四甲基丁基)-6-(2^苯並三唑 -2 -醯)-苯酚]、2 - ( 2 ’ -羥基-5 ’ -氧化甲基烯丙基苯基)-2H-苯並三唑、2-[2’-羥基-3 1-(3" ,4",5",6"-四氫酞醯 亞胺甲基卜5 ’ -甲基苯]苯並三唑、2 - ( 2 ^羥基-5 -氧化甲 基烯丙基苯基)- 2H-苯並三唑、2 - (2 ’ -羥基-5 1 -氧化甲基 烯丙基苯基)-2H-苯並三唑、2-(2’-羥基- 3’-第三丁基 -5'-丙烯醯基乙基苯)-5-氯化-2H-苯並三唑; 氰基丙烯酸系:乙基-2 -氰基-3 , 3 ’ -二苯基丙烯酸酯。 除上述之外,尙有雙(辛基苯)硫酸鎳、[2,2 ’ -硫代雙 (4 -第三辛基酚鹽)]-正丁基胺鎳、鎳配位-3,5 -二•第三 丁基-4 -羥基苄、磷酸乙酯、鎳.二丁基二硫代氨基甲酸 527507 五、發明説明(1G) 鹽、2,4 -二-第三丁基苯- 3',5、二.第三丁基- 41-羥基 苯甲酸鹽、2 -乙氧基- 2’-乙基草酸雙苯胺鹽、2-(4,6 -二 苯基-1 ,3, 5-三哄-2-醯)-5-[(己基)氧化]-酚。 在本發明中,上述具體例中,最好採用受阻胺系、二苯 基酮系、苯並三唑系中任一者,尤以合倂使用該等者爲 佳。 在本發明中,因爲更容易形成塗佈層,所以對塗佈層中 的光安定劑,最好適當的混合其他樹脂成分。即,最好採 用在可分別溶解樹脂成分及光安定劑之有機溶劑、水、2 種以上有機溶劑混合液、或者將樹脂成分與光安定劑溶解 或分散於有機溶劑/水混合液中,使樹脂成分與光安定劑 進行分散,而呈塗液狀態的態樣者爲佳。當然,樹脂成分 與光安定劑亦可將預先溶解或分散於有機溶劑、水、有 機溶劑混合液、或有機溶劑/水混合液,任意混合後再使 用。另,最好預先將光安定劑成分與樹脂成分的共聚物, 直接作爲塗佈材料使用。當然,亦可採用將該共聚物溶解 於有機溶劑、水、2種以上有機溶劑混合液、或有機溶劑 /水混合液者。混合或共聚合之樹脂成分雖並無特別的限 制,在舉其中部分的話,則有如聚酯樹脂、聚胺甲酸酯樹 脂、丙烯酸樹脂、甲基丙烯酸樹脂、聚醯胺樹脂、聚乙烯 樹脂、聚丙烯樹脂、聚氯乙烯樹脂、聚偏二氯乙烯樹脂、 聚苯乙烯樹脂、聚醋酸乙烯樹脂、氟系樹脂等。該等樹脂 可單獨使用,亦可採用2種以上共聚合物或混合物。 上述樹脂中,最好選擇丙烯酸樹脂或甲基丙烯酸樹脂, -12- 527507 五、發明説明(n) 尤以採用丙烯酸樹脂或甲基丙烯酸樹脂中共聚合有光安定 劑成分者爲塗佈層之情況更佳。當共聚合時,相對光安定 劑單體成分,最好共聚合丙烯基單體成分或甲基丙烯基單 體成分。 光安定劑單體成分,最好使用如苯並三唑系反應性單體 、受阻胺系反應性單體、二苯基酮系反應性單體等。苯並 三唑系單體係僅要基本骨架具苯並三唑基,且具不飽和鍵 之單體者便可,其餘並無特別的限制,譬如2-( 2’-羥基 -5-氧化丙烯醯基乙基苯苯並三唑、2-(2,-羥基-5 ^ 氧化甲基丙烯基乙基苯)-2H-苯並三唑、2-(2、羥基-3’-第三丁基- 5'-丙烯醯基乙基苯)-5-氯-2H-苯並三唑等。同 樣的,受阻胺系反應性單體、二苯基酮系反應性單體係僅 要基本骨架具受阻胺基、二苯基酮基,且具不飽和鍵之單 體者便可。受阻胺系反應性單體係指如雙(2,2,6,6 -四甲 基-4-哌啶-5-氧化丙烯醯基乙基-苯)癸二酸酯、琥珀酸二 甲酯· 1 - ( 2 -羥乙基)-4 -羥基-2,2 , 6,6 -四甲基-5 -氧化丙 烯基乙基苯哌啶縮聚物、雙(2,2,6,6 -四甲基-4 -哌啶-5 -甲基丙烯醯基乙基苯)癸二酸酯、琥珀酸二甲酯· 1 - ( 2 -羥乙基)-4 -羥基-2 , 2,6,6 -四甲基-5 -氧化甲基丙烯基乙 基苯哌啶縮聚物、雙(2,2,6,6 -四甲基-4 -哌啶-5 -丙烯醯 基乙基苯)癸二酸酯、琥珀酸二甲酯· 1 - ( 2 -羥乙基)-4 -羥基-2,2,6,6 -四甲基-5 -氧化丙烯醯基乙基苯哌啶縮聚物 等。另,二苯基酮系反應性單體,譬如2-羥基-4-甲氧基 -5 -氧化丙烯醯基乙基苯基二苯基酮、2 , 2、- 4,4 1 -四羥基 -13- 527507 五、發明説明(]2) -5-氧化丙烯醯基乙基苯基二苯基酮、2,2'-二羥基-4-甲 氧基-5 -氧化丙烯醯基乙基苯基二苯基酮、2,2 ’ -二羥基 -4,4’-二甲氧基-5-氧化丙烯醯基乙基苯基二苯基酮、2-羥基-4-甲氧基-5-氧化甲基丙烯醯基乙基苯基二苯基酮 、2,2',- 4,4’-四羥基-5-氧化甲基丙烯醯基乙基苯基二 苯基酮、2,2^二羥基-4-甲氧基-5-丙烯醯基乙基苯基二 苯基酮、2,2 ^二羥基-4,4 ’ -二甲氧基-5 -丙烯醯基乙基 苯基二苯基酮等。 與該等光安定劑單體成分共聚合的丙烯基單體成分或 甲基丙烯基單體成分、或者其寡聚物成分,係可爲烷基 丙烯酸酯、烷基甲基丙烯酸酯(所謂烷基,係指甲基、乙 基、正丙基、異丙基、正丁基、異丁基、第三丁基、2-乙己基、月桂基、硬脂基、環己基等)、及具交聯性官能 基單體,譬如含羧基、氫氧基、磺酸基、醯胺基、羥甲基 化醯胺基、胺基、烷基醇化胺基、氫氧基、環氧基等單體 。此外,尙可爲丙烯腈基、甲基丙烯腈基、苯乙烯基、丁 基乙烯醚、馬來酸、衣康酸、及其二烷基酯、甲基乙烯酮 、氯乙烯、偏二氯乙嫌、醋酸乙燃醋、乙烯P比[(定、乙少希 吡咯酮、含乙烯基之烷氧基矽烷、不飽和聚酯等共聚合 物。 與該等光安定劑單體成分進行共聚合之單體的種類及共 聚合比率,並無特別的限制,雖可爲任意採用其中1種或 2種以上的任意比率進行共聚合,但最好在光安定劑單體 成分比率的1 0重量%以上,尤以在20重量%以上爲佳,特 -14- 527507 五、發明説明(13) 別以在3 5重量%以上者爲更佳。當然,亦可爲光安定劑單 體成分的單獨聚合。該等聚合物的分子量雖無特別的限 制,但通常在5,000以上,更以在1〇,〇〇〇以上者爲佳,特 別以在20,000以上者,就塗佈層的強韌性觀點而言,乃 屬更佳者。該等聚合物係採用溶解或分散於有機溶劑、 水或有機溶劑/水混合液中之狀態者。除此之外,尙可使 用市售的混合系光安定聚合物,譬如"優達布魯"(商品 名,音譯)(日本觸媒公司產製)等。 含光安定劑之塗佈層的厚度,雖並無特別的限制,但 最好爲0.5〜尤以1〜10/zm爲佳,更以2〜7//ΙΠ 爲更佳。若厚度小於〇 . 5 // πι的話,塗佈層的耐久性將不 足,反之,若大於1 5 // m的話,則將產生亮度降低的情 形。 上述含上述光安定劑之塗佈層,雖可直接設置於基 材的白色薄膜上,惟當黏接性不足之情況時,最好設置 基材薄膜的電暈放電處理或等底層處理等。底層處理可 爲設於白色薄膜製造程序內的方法(連線塗佈法),亦可 爲在製造完成白色薄膜後,再另行利用其他方式進行塗 佈的方法(離線塗佈法),雖僅要進行適當選擇便可,但 最好採用如共聚合聚酯樹脂、聚胺甲酸酯樹脂、丙烯酸 樹脂、甲基丙烯酸樹脂、及各種偶合劑等。 含光安定劑之塗佈層,係可利用任意方法進行塗佈。譬 如採用照相凹板塗佈、輥塗佈、旋塗、反相塗佈、硬塗佈 、網版塗佈、刮刀塗佈、空氣刀塗佈、浸塗等方法。另, -15 - 527507 五、發明説明(14) 當在塗佈後將塗佈層予以硬化之情況時,其硬化方法可採 用習知的硬化方法。譬如熱硬化、或紫外線、電子束、輻 射線等活性線的方法、或者組合該等方法的方法。此時, 最好合倂使用交聯劑等硬化劑。設置塗佈層的方法,可於 製造基材之白色薄膜時便施行塗佈(連線塗佈),亦可在結 晶偏向完成後,再塗佈於白色薄膜上(離線塗佈)。 本發明之白色薄膜最好由設置含光安定劑之塗佈層的面 所測得之400〜700nm波長中之平均反射率,在85%以上, 尤以在87%以上爲佳,更以在90%以上爲更佳。若平均反射 率低於85%的話,在使用於液晶顯示器上時,將產生亮度 不足的情形。 另,在本發明中,由設置含光安定劑之塗佈層的面所測 得之光澤度,最好在60%以下,尤以在50%以下爲佳,更 以在40%以下爲更佳。若光澤度大於60%的話,在使用於液 晶顯示器時,隨觀看角度將產生亮度降低的情形。 在本發明中,於含光安定劑的塗佈層中,於不妨礙本發 明功效的範圍下,可添加各種添加劑。所謂的添加劑, 可採用如有機及/或無機微粒子、螢光增白劑、交聯劑、 耐熱安定劑、抗氧化安定劑、有機滑劑、抗靜電劑、核劑 、偶合劑等。 特別係在塗佈層中添加有機及/或無機微粒子,就設置 塗佈層之面的光澤度,可輕易設定於上述範圍內的觀點而 言,較具優勢。此類無機微粒子可使用如矽石、銘土、氧 化鈦(銳鈦礦型、金紅石型)、氧化鋅、硫酸鈀、硫化鋅、 -16- 527507 五、發明説明(]5) 碳酸鈣、沸石、高嶺土、滑石等。有機粒子則可採用如交 聯苯乙烯、交聯丙烯等。有機及/或無機微粒子的粒徑, 最好爲0.05〜15//in,尤以0.1〜10//m爲佳。若低於〇.〇5 V m的話,則降低光澤度的效果將不彰顯,反之,若超過 1 5 // m的話,則表面上便將產生所需以上的粗糙度,而容 易造成粒子脫落的現象,所以並不被喜好。另,其含量 最好爲0.5〜50重量%,尤以1〜40重量%爲佳,更以2〜30 重量%爲更佳。若含量低於0 . 5重量%的話,則較低光澤度 的效果將偏小,反之,若大於50重量%的話,則將造成塗 佈較爲困難,且表面上便將產生所需以上的粗糙度,而 容易造成粒子脫落的現象,所以並不被喜好。 再者,塗佈層中添加螢光增白劑,可提升白色度或色 度’所以更佳。所謂螢光增白劑係可如添加於前述白色薄 膜中者相同。塗佈層中螢光增白劑的含量,最好爲〇 . 〇 1〜 2重量%,尤以〇.〇3〜1.5重量%爲佳,更以在0.05〜1重 量%範圍內者爲更佳。若低於〇 . 〇丨重量%的話,則效果偏 小’反之,若超過2重量%的話,則因爲反而將產生拖帶, 或較容易降低耐久性,故不爲所好。 本發明中,白色薄膜的厚度,最好爲丨〇〜500 // m,尤 以20〜3 00 // m爲佳。厚度若低於1〇 # m的話,反射率或白 色度、色度將呈低水準,此外亦將產生處理性惡化的趨勢 。反之’厚度若大於500 // m的話,當作爲面光源反射元件 而使用於液晶顯示器上時,便容易造成重量增加,甚至容 易造成成本增加。此外’若白色薄膜屬複合薄膜之情況時 -17- 527507 五 '發明説明(16) ,其表層/內層的比率,最好爲1/30〜1/3,尤以1/20〜 1 /4爲佳。當屬表層/內層/表層的三層薄膜之情況時,該 比率係指二表層合計/內層。 其次,相關本發明之面光源反射元件用白色薄膜的製造 方法,雖針對其中一例進行說明,但並不僅侷限於此例。 具備擠出機A與擠出機B的複合製膜裝置中,在擠出機A 中提供經乾燥過的PET晶片85重量份、聚甲基戊烯1 5重 量份、及分子量4000之聚乙二醇1重量份的混合材料。在 擠出機B中則供給PET 90重量份、平均粒經系約1 // m的 碳酸鈣1 0重量份、及螢光增白劑0 . 03重量份的混合材 料。當然,提供給擠出機A、B中之原料的各成分,可預先 利用製成顆粒法等方法進行混合。將擠出機A、B加熱至 2 80〜3 00°C,然後進行熔融擠出。此時,以擠出機A原料 爲內層,而將擠出機B之原料疊層於二表面上,進行複合 化。將經擠壓出之薄片,在表面溫度1 0〜60°C的冷卻輥上 進行固化。同時,爲求獲得均勻的薄片,最好賦加靜電而 密接於輥上。將經冷卻固化後的薄片,引導於經加熱至7 0 〜1 20°C的輥組中,在長度方向押延約2〜5倍,然後在20 〜4 0 °C的輥組中進行冷卻。然後,連續利用夾子握持薄膜 端部’並引導於拉幅機內,在90〜120°C下進行預熱後, 將寬度方向拉伸3〜6倍。接著連續的引導於經加熱至丨80 〜230°C的區域中,進行約3〜20秒的熱處理,然後冷卻 至40°C以下,便獲得白色薄膜。所獲得白色薄膜之一面 -18- 527507 五、發明説明(17) 上’將含紫外線吸收能的化合物、光安定劑、樹脂依特 定比率混合並塗抹,然後乾燥。 經由此所獲得之本發明面光源反射元件用白色薄膜, 初期亮度佳,且即便經長期使用後亦毫無劣化現象,可 維持液晶畫面的亮度。 [特性測量方法及評估方法] (1) 平均氣泡徑 採用穿透型電子顯微鏡HU-12型(日立製作所(股)製), 以3000〜20萬倍觀察薄膜截面,將其截面照片視線內的氣 泡部分予以作記號,並採用高畫質影像解析處理裝置PI AS -1 V (皮阿司(公司名,音譯)(股)製),進行影像處理。爲 求取相關1 00個氣泡換算成正圓時的平均氣泡徑,而求 算出其平均値。 (2) 比重 將薄膜切成50mmx 60nm大小,並以此爲試料樣品,採用 高精度電子比重計SD-120L(米拉休(公司名’音譯)貿易 公司製),並根據]IS K-7112之A法(水中取代法)進行測 量。另,測暈溫度係在溫度23°C、相對溼度65%下進行。 (3 )光澤度 採用數位變角光澤度計UGV-5B(速加(公司名’音譯)試 驗機(股)製),利用白色聚酯層(幻’並根據JIS Z- 8741 進行測量。另,測量條件設定爲入射角=60° 、接光角 = 6 0。。 (4 )平均反射率 -19- 527507 五、發明説明(18) 採用分光式色差計SE- 20 00型(日本電色工業(股)製)’ 並根據J IS Z- 8722,以10nm間隔,測量400〜700nm範圍 下的分光反射率,並以其平均値爲平均反射率。 (5 )面光源的亮度 根據第1圖所示的裝置,並準備在厚度2mm壓克力製透 明導光板上施行網點印刷1 5者,並以該壓克力製透明導 光板之網點印刷端爲反射板1 1,並設定薄膜樣品,並以 另一端爲擴散板1 3,並重疊上半透明薄片。其次,在透明 導光板1 4之一端面上,裝設冷陰極制線管1 6的6W螢光照 明,並如第1圖所示般,在該螢光照明周圍覆蓋反射器1 2 。照明亮螢光照明,採用數位光度計〗1 6與亮度測量用探 針J 6503 (特克尼庫司(公司名,音譯)公司產製),測量亮 度。另,該測量係將裝設於光度計上的亮度測量用探針之 接光部分,垂直按押抵接於擴散板1 3上而進行測量。亮度 係將面內平均分割成9等份,並針對此9點進行3次測量 的平均値。 (6 )耐久性試驗後之平均反射率、亮度 採用紫外線劣化促進試驗機AISUPA-UV-TESTER-SUV-W131(商品名,音譯)(岩崎電氣(股)製),依下述條件進 行強制紫外線照射試驗。 [紫外線照射條件] 照度:lOOmW/cm2、溫度:60°C、相對淫度;50%RH、 照射時間:8小時 相關經照射後之樣品,根據上述(4 )、( 5 )之方法,測 -20- 527507 五、發明説明(19) 量平均反射率及亮度。 實施例 以下,雖採用以下實施例及比較例,針對本發明進行說 明’惟並未特別局限於此。 [實施例1] 對具擠出機A與擠出機B之複合製膜裝置,供給下述組 成的原料。 .擠出機A :在180°C下,真空乾燥4小時的pet晶片9〇 重量份、聚甲基戊嫌10重量份及分子量400之具乙二醇1 重量份。 •擠出機B :在1 80t下真空乾燥4小時的含平均粒徑1 A m之硫酸鈀15重量%之PET晶片100重量份、及在180艺 下真空乾燥4小時的含1重量%螢光增白劑(OB - 1 :尹司特 曼(公司名,音譯)公司產製)之PET主晶片3重量份。 將擠出機A、B之原料,在2 9 0 °C下進行熔融擠出,並以 擠出機A之熔融原料爲內層,而以擠出機B之熔融原料爲 二表層,並合流而利用T模擠出成薄片狀。複合薄膜的厚 度構成比爲B/A/B(5/90/5)。將使薄片流延於表面溫度20°C 的鏡面冷卻輥上,而形成爲經拉伸的薄片。將此薄片在 經加熱至90°C的輥組上進行預熱,於95°C下朝長度方向 拉伸3 . 5倍。經單軸拉伸過薄片的一面,在空氣中施行電 暈放電處理,然後依使乾燥後厚度爲0 . 3 v m方式,塗佈 聚胺甲酸酯彈性體液(A對40 :大日本油墨(股))。之後, -21- 527507 五、發明説明(2Q) 利用夾子握持薄片端部,並引導於經加熱至l〇5〇C下拉幅 機中,將塗佈層水分予以去除。然後,在no°c環境中, 連繪朝寬度方向拉伸3 . 5倍。更於2 1 51:環境中,連續施 行8秒的熱處理,而獲得總厚度1 8 8 v⑺的白色基材薄膜。 在此白色基材薄膜之聚胺甲酸酯塗佈層面上,依乾燥 後厚度約5 /z m之方式塗佈"優塔布魯"(商品名,音譯) UV6010(日本觸媒(股)製),並以此爲含光安定劑的塗佈 層。乾燥係在1 50°C、2分鐘的條件下進行熱風乾燥處理 。所獲得之面光源反射元件用白色薄膜,如表1中所示, 在耐久測試中,將較不易變黃,且平均反射率、亮度較 低情況亦較小。 [比較例1] 直接將實施例1所製得之白色基材薄膜,採用爲面光源 反射元件用白色薄膜,並進行評估結果,初期亮度雖較佳 ,但耐久性卻嫌不足,黃色明顯增加,平均反射率及亮度 卻明顯的降低。 [實施例2〜5] 如同實施例1般製得白色基材薄膜。將此白色基材薄膜 之聚胺甲酸酯塗佈層面,如同實施例1般,依乾燥後厚度 爲1 μ m (實施例2 )、3 // m (實施例3 )、7 // m (實施例4 )、1 0 // m (實施例5 )之方式,塗抹上含光安定劑的塗佈層。相 較於實施例1下’塗佈厚度較薄之情況(實施例2、3 )中耐 久性有稍微降低的趨勢,而塗佈層較厚(實施例4、5 )的話 -22- 527507 五、發明説明(21) ,初期亮度有些微降低的趨勢,但任一者優於比較例1。 [實施例6] 如同實施例1般製得白色基材薄膜。除在此白色基材薄 膜之聚胺甲酸酯塗佈層面,塗抹下述塗液組成之外,其餘 均如同貫施例1般的設置含光安定劑的塗佈層。所獲得之 面光源反射元件用白色薄膜,如表丨中所示,在耐久測試 中,將較不易變黃,且平均反射率、亮度較低情況亦較 小。 (塗佈層形成塗液) "優塔布魯"UV 714(商品名,音譯):lO.Og (40%溶液、日本觸媒(股)製) "速米里魯"N3200 (商品名,音譯):〇.5g (硬化劑、住支拜耳烏拉旦(公司名,音譯)(股)製) 醋酸乙酯/甲苯(重量比二1/1) : 12· 0g [實施例7、8、9 ] 如同實施例6般製得白色基材薄膜。除在此白色基材薄 膜之聚胺甲酸酯塗佈層面,分別相對實施例1之塗液20 . Og ,一邊添加無機粒子之矽石粉末(富士西里西亞(公司名, 音譯)(股)製、"賽佛若比克"(商品名,音譯)1〇〇)各0.13g (含量爲乾燥份比3重量%)、0.21g(同、5重量%)、0.39(同、 7重量%),並一邊進行攪拌,其餘均如同實施例6般的設置 含光安定劑的塗佈層。所獲得之面光源反射元件用白色薄 膜,如表1中所示,在耐久測試中,將較不易變黃,且平 均反射率、亮度較低情況亦較小。 -23- 527507 五、發明説明(22) [比較例2 ] 採用僅具擠出機A之單層製膜裝置,將含平均粒徑〇 .丄5 V Hi之銳鈦礦型氧化鈦1 0重量%的pET晶片,充分進行真空 乾燥後,再提供於擠壓機。然後於29(rc下熔融擠壓呈薄 片狀’並於2 0 C之冷卻輕上流延,而製成未拉伸薄片。 將此薄片利用實施例1之方法,朝長度方向、寬度方向進 行拉伸,並施行熱處理,而獲得厚度188/z m之白色基材 薄膜。於此薄膜上同實施例1般,形成含光安定劑的塗佈 層。 所獲得之薄膜,如表1中所示,內部幾乎未存在有氣泡 ,且初期的反射率、亮度均嫌不足。 -24- 527507 五、發明説明(23 ) 耐久性試驗後 亮度 Cd/m2 υη 寸 m m σΝ C<l Ό m 550 CNl un 寸 un υη cn 寸 平均反射率 〇〇 S ΟΟ m οο OO oo S m 〇0 oo \〇 oo 亮度 Cd/m2 υη cn r- v〇 νο υη S wn 寸 on oo m υη cn un \o 1—1 r- 寸 Ό 〇o 寸 初期特β 平均反射率 σ\ οο 冢 oo oo v〇 oo oo OO OO oo σ> οο 光澤度 cn σ\ CN § CN o\ σ\ υη σ\ m ON r H t—Ί 比重 1 0.83 0.83 0.83 0.83 0.83 0.83 0.83 0.83 0.83 0.83 cn y—i 平均粒徑 表層 B ΟΟ 〇〇 〇0 oo OO OO 〇0 oo OO 〇ο 1 內層 B οο CO 〇o Csl 〇0 CN oo CNl O〇 CNl 〇o C<1 oo CNl 〇o csl 〇o cs οο CN 無氣泡 調 _ ig! 剡犖 重量% ο 1 ο 〇 〇 〇 o m on o 匿鲥 {Η 14 揪噢 劍 P 3 on 1 m o un 評估項目 單位 實施例1 比較例1 實施例2 實施例3 實施例4 實施例5 實施例6 實施例7 實施例8 實施例9 比較例2 -25 527507 五、發明説明(24) [產業利用性] 本發明之面光源反射元件用白色薄膜,因爲隨光源經時 間變化所產生的劣化現象較小,可長期維持液晶顯示器之 畫質、亮度,故可利用於液晶畫面用邊緣照明及正下方型 照明之面光源反射板、及供反射器所使用的元件用。 [符號說明] 11.. ..反射板 12 .. ..反射器 13 . · ..擴散板 14.. ..透明導光板 15 ·. ..網點印刷 16 .. ..冷陰極制線管 -26-
Claims (1)
- 527507 w 告範圍 第90 1 1 6848號「面光源反射元件用白色薄膜」專利案 (91年11月18日修正) 六申請專利範圍: 1 . 一種面光源反射元件用白色薄膜,其特徵在於:在 內部含氣泡之白色薄膜的至少一面上,設置含光安 定劑的塗佈層。 2 .如申請專利範圍第1項之面光源反射元件用白色薄 膜,其中該塗佈層係在丙烯酸樹脂或甲基丙烯酸樹 脂中,共聚合光安定劑成分。 3 .如申請專利範圍第1項之面光源反射元件用白色薄 膜,其中該光安定劑係至少爲受阻胺系、或苯並三 唑系、二苯基酮系中任一者。 4 .如申請專利範圍第1項之面光源反射元件用白色薄 膜,其中在設置有塗佈層面所測得400〜700nm波長 之平均反射率爲85%以上。 5 .如申請專利範圍第1項之面光源反射元件用白色薄 膜,其中在設置有塗佈層面所測得光澤度爲60%以 下。 6 .如申請專利範圍第1項之面光源反射元件用白色薄 膜.,其中白色薄膜係由以聚酯樹脂爲主要構成成分 之樹脂組成物所組成。 7 .如申請專利範圍第1之面光源反射元件用白色薄 膜,其中該內部氣泡爲將聚酯樹脂、聚酯樹脂非相 527507 六、申請專利範圍 溶性的樹脂、或有機或無機粒子的混合物,進行熔 融擠壓,並至少朝一方向拉伸而成。 8 ·如申請專利範圍第1項之面光源反射元件用白色薄 膜,其中該白色薄膜係複合薄膜。 9 .如申請專利範圍第8項之面光源反射元件用白色薄 膜,其中該白色薄膜之複合層係含無機微粒子,且 含有以無機微粒子爲核而所形成氣泡。 1 〇 .如申請專利範圍第8或9項之面光源反射元件用白 色薄膜’其中該白色薄膜係表層與內層均含氣泡的 _合薄膜,且氣泡之截面平均徑爲表層部分小於內 層部分。 11如申請專利範圍第1項之面光源反射元件用白色薄 膜,其中該塗佈層係更含有有機或無機微粒子。 i 2如申請專利範圍第1之面光源反射元件用白色薄 膜,其中該塗佈層或白色薄膜係更含有螢光增白 劑。
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US (2) | US7285327B2 (zh) |
EP (2) | EP1302788B1 (zh) |
KR (2) | KR100611599B1 (zh) |
DE (1) | DE60108250T2 (zh) |
TW (1) | TW527507B (zh) |
WO (1) | WO2002004996A1 (zh) |
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2001
- 2001-07-10 EP EP01947960A patent/EP1302788B1/en not_active Expired - Lifetime
- 2001-07-10 TW TW090116848A patent/TW527507B/zh not_active IP Right Cessation
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- 2001-07-10 KR KR1020027003251A patent/KR100611599B1/ko active IP Right Grant
- 2001-07-10 US US10/070,697 patent/US7285327B2/en not_active Expired - Lifetime
- 2001-07-10 EP EP04025692A patent/EP1510837A3/en not_active Withdrawn
- 2001-07-10 WO PCT/JP2001/005981 patent/WO2002004996A1/ja active IP Right Grant
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TWI383012B (zh) * | 2004-11-12 | 2013-01-21 | Toray Industries | 白色薄膜及使用它之背光 |
CN101432347B (zh) * | 2006-06-08 | 2012-07-04 | 古河电气工业株式会社 | 热塑性树脂发泡体 |
TWI419918B (zh) * | 2006-06-08 | 2013-12-21 | Furukawa Electric Co Ltd | Thermoplastic resin foam |
TWI421443B (zh) * | 2006-06-23 | 2014-01-01 | Toray Industries | 白色反射薄膜 |
US7867602B2 (en) | 2006-12-25 | 2011-01-11 | Eternal Chemical Co., Ltd. | Scratch-resistant optical film |
CN103345088A (zh) * | 2013-07-04 | 2013-10-09 | 青岛海信电器股份有限公司 | 直下式液晶模组和液晶显示装置 |
Also Published As
Publication number | Publication date |
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EP1302788B1 (en) | 2005-01-05 |
EP1510837A2 (en) | 2005-03-02 |
DE60108250T2 (de) | 2005-05-25 |
US20070014982A1 (en) | 2007-01-18 |
EP1510837A3 (en) | 2005-03-16 |
KR20020060179A (ko) | 2002-07-16 |
US20030068466A1 (en) | 2003-04-10 |
EP1302788A4 (en) | 2003-06-04 |
WO2002004996A1 (fr) | 2002-01-17 |
KR20060053016A (ko) | 2006-05-19 |
EP1302788A1 (en) | 2003-04-16 |
KR100611599B1 (ko) | 2006-08-11 |
US7285327B2 (en) | 2007-10-23 |
US8486519B2 (en) | 2013-07-16 |
DE60108250D1 (de) | 2005-02-10 |
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