TWI554386B - Production method of thermoplastic resin microfoil reflection sheet, light reflection plate, backlight panel and foam reflection sheet - Google Patents
Production method of thermoplastic resin microfoil reflection sheet, light reflection plate, backlight panel and foam reflection sheet Download PDFInfo
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- TWI554386B TWI554386B TW102128447A TW102128447A TWI554386B TW I554386 B TWI554386 B TW I554386B TW 102128447 A TW102128447 A TW 102128447A TW 102128447 A TW102128447 A TW 102128447A TW I554386 B TWI554386 B TW I554386B
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- Taiwan
- Prior art keywords
- layer
- foamed
- thermoplastic resin
- reflective sheet
- finely
- Prior art date
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- 239000006260 foam Substances 0.000 title claims description 15
- 238000004519 manufacturing process Methods 0.000 title claims description 10
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- 229920005989 resin Polymers 0.000 claims description 47
- 239000011347 resin Substances 0.000 claims description 47
- 238000005187 foaming Methods 0.000 claims description 16
- 239000003963 antioxidant agent Substances 0.000 claims description 15
- 230000003078 antioxidant effect Effects 0.000 claims description 15
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- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 8
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- 238000001125 extrusion Methods 0.000 claims description 3
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Description
本發明係關於一種具有微細之氣泡,且具有一種以上之機能性的非晶性樹脂熱塑性樹脂發泡片、光反射板、背光面板及發泡反射片之製造方法。
先前,作為照明或液晶背光之反射板係使用對金屬板塗佈光反射性優異之塗料而成者、或對金屬板積層光反射性優異之樹脂膜等而成者。近年來,於照明器具或液晶顯示器等領域中,要求進一步之省電化、高效化。尤其於電飾廣告牌或顯示器之領域,省空間化之需求亦提高,而上述反射板難以應對省空間化。
因此,光反射性優異之具有微細之氣泡且具有較高之成形加工性的樹脂片材被用作照明或液晶背光之反射板等(例如參照專利文獻1)。
且說,對於如照明器具等供於曝露於外部氣體之用途之光反射板,要求高機能性。所謂高機能性係指防污性、表面硬度、耐候性等對塑膠製品所要求之各種特性,一般而言,該等較多為藉由對成型體之表層部之賦予而獲得充分之機能性。
先前,以此種機能性賦予為目的,藉由對塑膠發泡片之表層部添加機能性添加劑而實現了具有較高之機能性之發泡製品之例較多。但
是,已知通常此種機能性添加劑之添加會對樹脂之發泡性造成較大影響,引起氣泡構造之粗大化。
作為不對發泡性造成較大影響而賦予高機能性之方法,現廣泛使用利用塗佈、層疊等之方法(例如參照參考文獻2)。然而,此種方法由於增加步驟數,故而存在高成本化之問題。
但是,發泡片於發泡時不僅容易產生微細之氣泡,而且容易產生0.5mm以上(或片材厚度之1/2以上之大小)之粗大氣泡。尤其於熱塑性樹脂為非晶性樹脂之情形時,該傾向變得明顯。因此,存在難以作為以光反射材為首之各種成形品而使用的問題。
[專利文獻1]國際公開第2012/023173號說明書
[專利文獻2]日本特開2007-90599號公報
本發明提供一種具有平均氣泡直徑為10μm以下之微細且均勻之氣泡構造,且具有較高之光反射效率及機能性的熱塑性樹脂微細發泡反射片、光反射板、背光面板及發泡反射片之製造方法。
本發明者等人經過各種研究,結果藉由以下手段達成上述課題。
(1)一種熱塑性樹脂微細發泡反射片,其係具有發泡層、及於上下夾持該發泡層之厚度為150μm以下且30μm以上之非發泡層者,其
特徵在於:該熱塑性樹脂微細發泡反射片係經一體成形而成,該發泡層係具有平均氣泡直徑為10μm以下且0.5μm以上,且氣泡數密度為1×106個/mm3以上且1.0×1012個/mm3以下之均勻氣泡構造的熱塑性樹脂微細發泡體,於該非發泡層之至少一者含有機能賦予層。
(2)如(1)之熱塑性樹脂微細發泡反射片,其中上述機能賦予層係含有抗靜電劑、紫外線吸收劑或抗氧化劑之抗靜電層或紫外線吸收層。
(3)如(2)之熱塑性樹脂微細發泡反射片,其中上述抗靜電劑、紫外線吸收劑或抗氧化劑僅含有於上述機能賦予層,或上述機能賦予層之至少1層所含有之抗靜電劑、紫外線吸收劑或抗氧化劑之含量高於其餘層所含有之含量。
(4)如(1)至(3)中任一項之熱塑性樹脂微細發泡反射片,其中上述非發泡層均包含上述機能賦予層。
(5)如(1)至(4)中任一項之熱塑性樹脂微細發泡反射片,其中上述機能賦予層中之樹脂之50質量%以上係由與上述發泡層相同之熱塑性樹脂構成。
(6)如(1)至(5)中任一項之熱塑性樹脂微細發泡反射片,其中上述熱塑性樹脂為聚碳酸酯。
(7)如(1)至(6)中任一項之熱塑性樹脂微細發泡反射片,其於550nm之波長之反射率(氧化鋁製之標準白色板基準)為98%以上。
(8)如(1)至(7)中任一項之熱塑性樹脂微細發泡反射片,其於350nm之波長之反射率(氧化鋁製之標準白色板基準)為30%以下。
(9)如(1)至(8)中任一項之熱塑性樹脂微細發泡反射片,其表面
固有電阻值為1×1012Ω以下。
(10)一種發泡反射片之製造方法,其發泡反射片為(1)至(9)中任一項之熱塑性樹脂微細發泡反射片,且包含下述步驟(a)至(c):(a)藉由利用共擠出之一體成型而製備3層構造之樹脂片之步驟,該樹脂片係由用以形成發泡層之熱塑性樹脂層、與用以形成非發泡層之熱塑性樹脂層構成之至少3層構造之樹脂片,該非發泡性層之至少一者包含機能賦予層;(b)使不活性高壓氣體含浸於該樹脂片之步驟;(c)對該樹脂片進行加熱而使用以形成發泡層之熱塑性樹脂層發泡之步驟。
(11)如(10)之發泡反射片之製造方法,其中相對於用以形成發泡層之熱塑性樹脂層之熱塑性樹脂100質量份,調配氣泡化成核劑0.1~10質量份。
(12)一種光反射板,其由(1)至(9)中任一項之熱塑性樹脂微細發泡反射片構成。
(13)一種背光面板,其具有(12)之光反射板。
於本說明書中,「熱塑性樹脂」之用語係採用除由1種熱塑性樹脂構成之樹脂以外,亦包括由2種以上之熱塑性樹脂構成之摻合樹脂的概念。因此,「熱塑性樹脂之組成」之用語於熱塑性樹脂由1種熱塑性樹脂構成之情形時,意指該熱塑性樹脂之種類,若熱塑性樹脂為由2種以上之熱塑性樹脂構成之摻合樹脂,則意指該摻合樹脂之組成。
又,於本說明書中,所謂某原料、構件或構成「由熱塑性樹
脂構成」或「由熱塑性樹脂形成」係採用如下概念:除該原料、構件或構成僅由熱塑性樹脂構成之態樣以外,亦包括由向熱塑性樹脂調配各種添加劑而成之組成物構成之態樣。
具體而言,80~100質量%由熱塑性樹脂構成之形態係「由熱塑性樹脂構成」或「由熱塑性樹脂形成」之形態。又,所謂「由熱塑性樹脂構成」或「由熱塑性樹脂形成」較佳為90~100質量%。更佳為95~100質量%由熱塑性樹脂構成之形態。該情況於熱塑性樹脂被指定為更具體之樹脂名之情形時亦相同。
根據本發明,可提供一種具有平均氣泡直徑為10μm以下之微細且均勻之氣泡構造,且具有較高之光反射效率及機能性的熱塑性樹脂微細發泡反射片、光反射板、背光面板及具有上述性能且廉價、簡便之發泡反射片之製造方法。
本發明之上述及其他特徵及優點根據下述記載變得更加明確。
10‧‧‧熱塑性樹脂微細發泡反射片
11‧‧‧發泡層
12‧‧‧非發泡層或包含機能賦予層之非發泡層
13‧‧‧氣泡
圖1係表示本發明之熱塑性樹脂微細發泡反射片之一形態之縱剖面的示意圖。
以下,參照圖式對本發明之熱塑性樹脂微細發泡反射片之實施形態進行詳細說明,但本發明不受該實施形態限定。
本發明之熱塑性樹脂微細發泡反射片之一實施形態示於圖1。熱塑性樹脂微細發泡反射片(10)具有具備發泡層(11)且於該發泡層之兩側具備非發泡層(12)之構造。此處,該發泡層(11)之兩側所具有之非發泡層(12)中之任一者或兩者包含機能賦予層。再者,非發泡層亦可為機能賦予層。
於本發明之熱塑性樹脂微細發泡反射片中,發泡層及非發泡層均由熱塑性樹脂形成,但形成發泡層之熱塑性樹脂之組成與形成於非發泡層所形成之機能賦予層之熱塑性樹脂之組成相互不同。
[發泡層]
本發明之熱塑性樹脂微細發泡反射片之發泡層由熱塑性樹脂構成。該熱塑性樹脂並無特別限制,可列舉聚烯烴樹脂、聚酯樹脂、聚碳酸酯樹脂,於本發明中,較佳為聚酯樹脂、聚碳酸酯樹脂。其中,聚碳酸酯樹脂於輕量性、形狀穩定性、經濟性等特性方面優異,進而光反射特性優異,故而較佳。
再者,就非發泡層形成之觀點而言,熱塑性樹脂較佳為非晶性。
發泡層之厚度係根據上述反射片之用途、樣態等而適當決定,無法一概而論,較佳為300~5000μm,更佳為500~1500μm。
聚碳酸酯樹脂並無製造方法上之特別限制,但可藉由使脂肪族或芳香族之二醇或多元醇化合物與碳醯氯或碳酸二酯進行反應而獲得。又,可藉由使芳香族之二醇或多元醇化合物、或該化合物及少量多羥基化合物與碳醯氯或碳酸二酯進行反應而獲得。
作為芳香族之二醇或多元醇化合物,可列舉:2,2-雙(4-羥基
苯基)丙烷(通稱:雙酚A)、雙(4-羥基苯基)甲烷、1,1-雙(4-羥基苯基)乙烷、1,1-雙(4-羥基苯基)環己烷、2,2-雙(4-羥基-3,5-二甲基苯基)丙烷、2,2-雙(4-羥基-3-甲基苯基)丙烷、雙(4-羥基苯基)醚、雙(4-羥基苯基)硫醚、雙(4-羥基苯基)碸、4,4'-[1,4-伸苯基雙(1-甲基亞乙基)]雙酚、對苯二酚、間苯二酚及4,4'-二羥基聯苯等。
又,發泡層較佳為由添加有氣泡化成核劑作為添加劑之熱塑性樹脂構成。藉由添加氣泡化成核劑,可於熱塑性樹脂中產生更多氣泡核。藉此,於下述發泡步驟中,所產生之氣泡會阻礙相互之氣泡成長,故而可形成具有更微細之氣泡之發泡層。該氣泡化成核劑並無特別限制,可較佳地使用聚酯系彈性體、聚碳酸酯系彈性體。
氣泡化成核劑相對於熱塑性樹脂100質量份較佳為調配0.1~10質量份。
發泡層除含有上述熱塑性樹脂、氣泡化成核劑以外,亦可含有結晶化成核劑、結晶化促進劑、抗氧化劑、抗靜電劑、抗紫外線劑、光穩定劑、螢光增白劑、顏料、染料、相溶劑、潤滑劑、強化劑、難燃劑、交聯劑、交聯助劑、塑化劑、增黏劑、減黏劑等各種添加劑。
再者,於發泡層除了如氣泡化成核劑般產生氣泡所需之化合物以外,亦含有如上所述之化合物之情形時,其含量較佳為少於下述機能賦予層中之含量。
本發明之熱塑性樹脂微細發泡反射片所具備之發泡層具有氣泡。該氣泡較佳為獨立氣泡。更具體而言,較佳為熱塑性樹脂微細發泡反射片之總氣泡數之70%以上為獨立氣泡,更佳為80~100%,進而較佳為
90~100%,進而較佳為95~100%為獨立氣泡。
平均氣泡直徑為10μm以下,但就同時實現薄壁化與高反射率化之觀點而言,較佳為7.0μm以下,更佳為5.0μm以下,進而較佳為3.0μm以下,尤佳為2.0μm以下。
又,平均氣泡直徑通常為0.5μm以上,亦可為1.0μm以上。
再者,平均氣泡直徑可藉由以下方法測定。
(平均氣泡直徑之測定)
依據ASTM D3576-77而求出。拍攝發泡片之剖面之掃描式電子顯微鏡(SEM)照片,於所拍攝之SEM照片上在水平方向及垂直方向劃直線,測定直線貫穿之氣泡之弦之各自長度,並求出其平均值t。將照片之倍率設為M,代入下式而求出平均氣泡直徑d。
d=t/(0.616×M)
又,發泡層之氣泡數密度為1.0×106個/mm3以上,就同時實現薄壁化與高反射率化之觀點而言,較佳為1.0×107個/mm3~1.0×1011個/mm3,更佳為1.0×108個/mm3~1.0×1011個/mm3。再者,發泡層之氣泡數密度之上限為1.0×1012個/mm3以下,較佳為1.0×1011個/mm3。
再者,發泡層之氣泡數密度可利用以下方法測定。
(氣泡數密度之測定)
對發泡片之縱剖面拍攝SEM照片,於該SEM照片上隨機選擇發泡層中之任意100×100μm之區域,對其中存在之氣泡數n進行計數,並計算每1mm2中存在之氣泡數。藉由對所獲得之數值計算3/2次方而換算成每1mm3之氣泡數作為氣泡數密度。
[非發泡層]
構成非發泡層之樹脂較佳為包含與發泡層相同之熱塑性樹脂。與發泡層相同之熱塑性樹脂較佳為構成非發泡層之樹脂中之50質量%以上,較佳為100質量%之情形,即與發泡層相同之熱塑性樹脂,其中較佳為聚碳酸酯樹脂。
形成於發泡體之非發泡層之壁厚為30μm以上,更佳為60μm以上。又,一體成形之機能賦予層之壁厚未達30μm,更佳為25μm以下。又,就維持光學特性之觀點而言,非發泡層較佳為不超過150μm。
若使非發泡層之厚度未達30μm,則機能性材料向非發泡層樹脂之添加濃度增大,吸光性增大。因此,反射率等光學特性降低。因此,形成厚度未達30μm之非發泡層並不理想。
再者,非發泡層之厚度可利用掃描式電子顯微鏡(SEM)照片進行測定。
具體而言,可拍攝掃描式電子顯微鏡(SEM)照片,對熱塑性樹脂微細發泡反射片之表面部及氣泡層之最表層側之線劃平行線,測定該平行線之間隔作為未發泡層之非發泡層之厚度。
非發泡層除了含有上述熱塑性樹脂以外,亦可含有結晶化成核劑、結晶化促進劑、抗氧化劑、抗靜電劑、抗紫外線劑、光穩定劑、螢光增白劑、顏料、染料、相溶劑、潤滑劑、強化劑、難燃劑、交聯劑、交聯助劑、塑化劑、增黏劑、減黏劑等各種添加劑。
[機能賦予層]
於本發明中,於上述非發泡層之至少一者設置機能賦予層作為其至少
一個構成層。更佳為於發泡層兩面之非發泡層內設置機能賦予層。於此情形時,機能賦予層只要包含於非發泡層內,則其於非發泡層之位置並無特別限定。可為最外層,可為最內層,亦可為中間層,實際上宜為最外層或最內層。
機能賦予層之機能為抗靜電、紫外線吸收、防劣化等防止直接反射以外之機能。該等機能之中,於本發明中,可尤其適宜地賦予抗靜電或紫外線吸收。藉由使一體成形之機能賦予層之壁厚未達30μm(更佳為25μm以下),可防止粗大氣泡(所謂「凸起」)之產生。
此種機能較佳為含有添加劑而表現機能者,作為此種添加劑,較佳為抗靜電劑、紫外線吸收劑、抗氧化劑,可單獨含有該等,亦可併用該等。於本發明中,較佳為併用該等,其中較佳為併用抗靜電劑與紫外線吸收劑。
抗靜電劑可為有機抗靜電劑,亦可為無機抗靜電劑。
於本發明中,較佳為有機抗靜電劑,較佳為陰離子系、陽離子系或非離子系之界面活性劑。其中,較佳為陰離子系之界面活性劑。
此種界面活性劑較佳為使用例如丸菱油化工業(股)之DENON V-57S、DENON 2723。
抗靜電劑之含量相對於機能賦予層之樹脂100質量份較佳為0.05~5質量份,更佳為0.1~5質量份,進而較佳為0.1~2質量份。
作為紫外線吸收劑(含光穩定劑),可列舉:受阻胺系、水楊酸系、二苯甲酮系、苯并三唑系、苯并酮系、氰基丙烯酸酯系、三系、苯甲酸酯系、草醯替苯胺系、有機鎳系等有機系化合物、或藉由溶
膠凝膠法等所獲得之無機系化合物。其中較佳為無色者。
作為受阻胺系化合物,可列舉:癸二酸雙(2,2,6,6-四甲基-4-哌啶基)酯、琥珀酸二甲酯-1-(2-羥基乙基)-4-羥基-2,2,6,6-四甲基哌啶縮聚物、1,2,3,4-丁烷四羧酸四(2,2,6,6-四甲基-4-哌啶基)酯、苯甲酸2,2,6,6-四甲基-4-哌啶酯、丙二酸雙(1,2,2,6,6-五甲基-4-哌啶基)-2-(3,5-二第三丁基-4-羥基苄基)-2-正丁酯、癸二酸雙(N-甲基-2,2,6,6-四甲基-4-哌啶基)酯、1,1'-(1,2-乙烷二基)雙(3,3,5,5-四甲基哌酮)等。
作為水楊酸系化合物,可列舉:水楊酸對第三丁基苯酯、水楊酸對辛基苯酯等。
作為二苯甲酮系化合物,可列舉:2-羥基-4-正辛氧基二苯甲酮、2-羥基-4-甲氧基二苯甲酮、2-羥基-4-乙氧基二苯甲酮、2,4-二羥基二苯甲酮、2-羥基-4-甲氧基-5-磺基二苯甲酮、2,2',4,4'-四羥基二苯甲酮、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、雙(2-甲氧基-4-羥基-5-苯甲醯基苯基)甲烷等。
作為苯并三唑系化合物,可列舉:2-(2'-羥基-5'-甲基苯基)苯并三唑、2-(2'-羥基-5'-第三丁基苯基)苯并三唑、2-(2'-羥基-3',5'-二第三丁基苯基)苯并三唑、2-(2'-羥基-3'-第三丁基-5'-甲基苯基)-5-氯苯并三唑、2-(2'-羥基-3',5'-二第三丁基苯基)-5-氯苯并三唑、2-(2'-羥基-5'-第三辛基苯酚)苯并三唑、2-(2'-羥基-3',5'-二第三戊基苯基)苯并三唑、2,2'-亞甲基雙[4-(1,1,3,3-四甲基丁基)-6-(2H-苯并三唑-2-基)苯酚]、2-(2'-羥基-5'-甲基丙烯醯氧基苯基)-2H-苯并三唑、2-[2'-羥基-3'-(3",4",5",6"-四氫鄰苯二甲醯亞胺甲基)-5'-甲基苯基]苯并三唑、2-(2'-羥基-5-丙烯醯氧基乙基苯基)-2H-苯并三唑、2-(2'-羥基-5'-甲
基丙烯醯氧基乙基苯基)-2H-苯并三唑、2-(2'-羥基-3'-第三丁基-5'-丙烯醯基乙基苯基)-5-氯-2H-苯并三唑等。
作為氰基丙烯酸酯系化合物,可列舉:2-氰基-3,3-二苯基丙烯酸2-乙酯、2-氰基-3,3-二苯基丙烯酸2-乙基己酯、1,3-雙[2'-氰基-3,3'-二苯基丙烯醯氧基]-2,2-雙[(2-氰基-3',3'-二苯基丙烯醯基)氧基]]甲基丙烷等。
作為三系,可列舉:2-(4,6-二苯基-1,3,5-三-2-基)-5-(己基)氧基苯酚、2-(4,6-雙-2,4-二甲基苯基-1,3,5-三-2-基)-5-(己基)氧基苯酚等。
作為苯甲酸酯系化合物,可列舉3',5'-二第三丁基-4'-羥基苯甲酸2,4-二第三丁基苯酯、間苯二酚單苯甲酸酯、鄰苯甲醯基苯甲酸甲酯等;作為草醯替苯胺系化合物,可列舉2-乙氧基-2'-乙基草酸雙醯替苯胺等;作為有機鎳系化合物,可列舉:鎳雙(辛基苯基)硫醚、[2,2'-硫雙(4-第三辛基酚基)]正丁基胺鎳、鎳錯合物-3,5-二第三丁基-4-羥基苄基-磷酸單乙醇鹽、二丁基二硫代胺基甲酸鎳等。
作為苯并酮系化合物,可列舉:2,2'-(1,4-伸苯基)雙[4H-3,1-苯并-4-酮]等。
作為丙二酸酯系化合物,可列舉丙二酸[(4-甲氧基苯基)亞甲基]二甲酯等。
於該等之中,較佳為受阻胺系化合物、二苯甲酮系化合物及苯并三唑系化合物。
紫外線吸收劑(含光穩定劑)之含量相對於機能賦予層之樹脂100質量份較佳為0.05~10質量份,更佳為0.1~5質量份,進而較佳為1~2質量份。
作為抗氧化劑,可列舉:酚系抗氧化劑、受阻酚系抗氧化劑、苯胺系抗氧化劑、3價之磷系化合物、抗壞血酸、羥胺類或除此以外之各種還原劑。
抗氧化劑對紫外線吸收劑之穩定化亦產生作用,抗氧化劑之含量相對於機能賦予層之樹脂100質量份較佳為0.05~10質量份,更佳為0.1~5質量份,進而較佳為1~2質量份。
[發泡反射片之製造]
以下,對本發明之熱塑性樹脂微細發泡反射片之製造方法進行說明。
本發明之熱塑性樹脂微細發泡反射片係藉由一體成型而製備由用以形成發泡層之熱塑性樹脂層、及用以形成非發泡層之熱塑性樹脂層構成之至少3層構造之樹脂片,並使用該樹脂片而製造。
其中,非發泡層之至少一者包含機能賦予層,並含有賦予機能之添加劑。再者,非發泡層亦可為機能賦予層。
更具體而言,較佳為經由下述步驟(a)~(c)而製造。
(a)藉由利用共擠出之一體成型而製備由用以形成發泡層之熱塑性樹脂層、及用以形成非發泡層之熱塑性樹脂層構成之至少3層構造之樹脂片的步驟;(b)使不活性高壓氣體含浸於該樹脂片之步驟;及(c)對該樹脂片進行加熱,而使用以形成發泡層之熱塑性樹脂層發泡之步驟。
上述步驟(a)中所製造之至少3層構造之樹脂片較佳為由用以形成發泡層之熱塑性樹脂層、及設置於其兩面之用以形成非發泡層之
熱塑性樹脂層構成的3層構造,但亦可配合目標之發泡片之形態而適當地製成4層以上之構成。用以形成發泡層之熱塑性樹脂層由構成上述發泡層之熱塑性樹脂構成,用以形成非發泡層之熱塑性樹脂層由構成上述非發泡層之熱塑性樹脂構成。
於本發明中,較佳為於發泡層之兩面之非發泡層包含機能賦予層,且包含賦予機能之添加劑。
上述步驟(b)係使不活性氣體含浸於上述步驟(a)中獲得之樹脂片。較佳為藉由將上述步驟(a)中所獲得之樹脂片與分隔件重疊並捲繞而形成輥,將該輥保持於加壓不活性氣體氣氛中而使不活性氣體含浸於樹脂片。該分隔件若為具有不活性氣體或視需要使用之有機溶劑自由出入之空隙,且可忽略不活性氣體對其自身之滲透者,則可為任意分隔件。若揭示分隔件之較佳例,則可列舉樹脂性不織布或金屬製之網。
又,較佳為上述步驟(a)中所獲得之樹脂片於無延伸之狀態下含浸不活性氣體。若使其延伸,則有氣體不會充分滲透至片材內之虞。
於使不活性氣體含浸於已形成輥之樹脂片中之前,亦可使樹脂片含有有機溶劑。若使樹脂片含有有機溶劑,則可提高熱塑性樹脂片之結晶化度,片材之剛性提昇,而分隔件之痕跡不易殘留於片材表面。又,亦可期待使不活性氣體之滲透時間縮短之效果。
作為有機溶劑,例如可列舉:苯、甲苯、甲基乙基酮、甲酸乙酯、丙酮、乙酸、二烷、間甲酚、苯胺、丙烯腈、鄰苯二甲酸二甲酯、硝基乙烷、硝基甲烷、苄醇。其中,較佳為使用丙酮。
作為上述不活性氣體,可列舉:氦氣、氮氣、二氧化碳、氬
氣等。其中,二氧化碳於可大量含有於熱塑性樹脂中之方面較佳。不活性氣體之滲透壓於室溫(例如17℃)較佳為0.2~15MPa,更佳為0.25~10MPa。又,不活性氣體之滲透時間通常為1小時以上(較佳為1~30小時),較佳為使不活性氣體滲透至成為飽和狀態。
上述步驟(c)係使上述步驟(b)中所獲得之含浸有不活性氣體之樹脂片發泡。該發泡步驟係於用以形成發泡層之熱塑性樹脂層發泡,而用以形成非發泡層之熱塑性樹脂層不發泡之條件下進行。具體而言,可藉由自輥拆除分隔件,並將樹脂片加熱至用以形成發泡層之熱塑性樹脂之軟化點以上之溫度,而形成發泡層。該加熱較佳為以低於發泡層之熔點之溫度進行。用以發泡之加熱溫度較佳為120~240℃,更佳為130~200℃。
又,加熱時間較佳為30秒鐘~10分鐘,更佳為10秒鐘~5分鐘。
為了使用以形成發泡層之熱塑性樹脂層發泡,使用以形成非發泡層之熱塑性樹脂層不發泡,可考慮各種方法。例如,藉由預先對用以形成發泡層之熱塑性樹脂層添加氣泡化成核劑,或者對用以形成非發泡層之熱塑性樹脂層添加結晶化成核劑、結晶化促進劑,亦可於一定程度上控制各樹脂層之發泡性。又,藉由採用特定之樹脂作為用於形成各層之熱塑性樹脂,可更嚴密地控制發泡性。作為此種熱塑性樹脂,較佳者如上文所述。
本發明之熱塑性樹脂微細發泡反射片之厚度為0.2~2.0mm,更佳為0.5~1.5mm,進而較佳為0.8~1.2mm,尤佳為0.9~1.1mm,最佳為1.0±0.05mm。又,本發明之發泡片之比重為0.2~0.7,更佳為0.3~0.7,進而較佳為0.4~0.65。再者,比重亦可設為0.5以下。
本發明之熱塑性樹脂微細發泡反射片於550nm之波長之反射率(氧化鋁製之標準白色板基準)較佳為98%以上。又,於350nm之波長之反射率(氧化鋁製之標準白色板基準)較佳為30%以下。
熱塑性樹脂微細發泡反射片於550nm之波長之反射率及於350nm之波長之反射率之測定可藉由如下方式進行測定。
(反射率之測定)
使用分光光度計(例如Hitachi High-Tech公司製造之U-4100),並使用氧化鋁白色板(210-0740:Hitachi High-Tech Fielding公司製造)作為參考,例如以分光狹縫4nm之條件測定於550nm或350nm之波長之反射率。
關於本發明之熱塑性樹脂微細發泡反射片,熱塑性樹脂微細發泡反射片表面之固有電阻值較佳為1×1012Ω以下。熱塑性樹脂微細發泡反射片之表面固有電阻值之上限為1×1014Ω以下,若為超過該數值之表面固有電阻值,則無法獲得實用之抗靜電性。
藉由如此調整熱塑性樹脂微細發泡反射片之表面固有電阻值,可對熱塑性樹脂微細發泡反射片賦予抗靜電性,可維持長期之高反射性。
(表面固有電阻值之測定)
使用高電阻測定裝置(例如ADVANTEST製造之R8340A),以50mm 探針,於施加電壓500V之條件下進行表面固有電阻值之測定。
(密度之測定)
熱塑性樹脂微細發泡反射片整體之密度係利用水中置換法進行測定。
本發明之熱塑性樹脂微細發泡反射片之用途並無特別限制,例如可用作光反射板或揚聲器用振動板,其中可適宜地用作光反射板。
更具體而言,適合於液晶顯示裝置等之背光面板所使用之光反射板。
本發明之熱塑性樹脂微細發泡反射片上亦可塗佈有含有上述各種添加劑等之塗料,此種熱塑性樹脂微細發泡反射片亦包含於本發明之熱塑性樹脂微細發泡反射片中。
[實施例]
以下,藉由實施例更詳細地說明本發明,但本發明並不限定於此。
實施例1
以向Sumika Styron Polycarbonate公司製造之聚碳酸酯樹脂SI8000L添加有0.5質量%之新日本理化製造之NJSTAR NU100之系作為發泡層,獲得於該發泡層之正面背面之兩面積層有厚度為18μm之機能賦予層的厚度為600μm之聚碳酸酯片。機能賦予層係設為向Sumika Styron Polycarbonate公司製造之SI8000L添加界面活性劑系抗靜電劑DENON V-57S(丸菱油化工業公司製造)0.5質量%、二苯甲酮系紫外線吸收劑0.25質量%而成之複合物。將所獲得之片材於17℃、5.5MPa之二氧化碳中處理24小時後,於145℃之氣氛中加熱1分鐘,而製作發泡片。發泡片之厚度為1000μm。
對該發泡片進行以下測定及評價。
(1)未發泡層之厚度
拍攝掃描式電子顯微鏡(SEM)照片,對發泡片之表面部及氣泡層之最表層側之線劃平行線,測定該平行線之間隔作為未發泡層厚。
(2)氣泡直徑之測定
依據ASTM D3576-77而求出。拍攝發泡片之剖面之掃描式電子顯微鏡
(SEM)照片,於所拍攝之SEM照片上在水平方向及垂直方向劃直線,測定直線所貫穿之氣泡之弦之各自長度,並求出其平均值t。將照片之倍率設為M,代入下式而求出平均氣泡直徑d。
d=t/(0.616×M)
(3)氣泡數密度之測定
對發泡片之縱剖面拍攝SEM照片,於該SEM照片上隨機選擇發泡層中之任意100×100μm之區域,對其中存在之氣泡數n進行計數,並計算每1mm2中存在之氣泡數。藉由對所獲得之數值計算3/2次方而換算成每1mm3之氣泡數,設為氣泡數密度。
(4)發泡片整體之密度之測定
藉由水中置換法測定發泡片之比重,並將其設為發泡體之密度。
(5)反射率之測定
.全光線反射率
使用Hitachi High-Technologies(股)製造之分光光度計U-4100,於分光狹縫4nm之條件測定於350nm、550nm之波長之反射率。表1以相對值表示將固定有氧化鋁之微粉末之白板之反射率設為100%時之各發泡片之反射率。
(6)表面固有電阻值之測定
依據JIS K 6911而求出。使用ADVANTEST製造之R8340A,利用高電阻測定用測試盒R12702A測定表面固有電阻值。
(7)耐光試驗
使用KONICA MINOLTA公司製造之CM-300,測定Luv表色系之色調
後,藉由Suga Test Instruments公司製造之EYE SUPER UV測試機於300μW/m2、照射距離100mm之條件照射16小時。對照射後之樣品再次使用上述CM-300進行測定,根據下式求出色差△E,並進行耐紫外線變色性之評價。
L、u、v表示色空間中之座標值之各差量。
所獲得之片材係氣泡直徑1μm左右之均勻之發泡體,密度為330kg/m3,於表層部具有50μm左右之未發泡層。發泡片於550nm之波長之反射率為100%(Al2O3基準),於350nm之波長之反射率為28%(Al2O3基準)。又,表面固有電阻值為1.83×1011Ω,紫外線照射試驗後之色差△E為13。
將所獲得之結果匯總於下述表1。
實施例2
除了將正面背面之兩面之機能賦予層之厚度變更為30μm以外,以與實施例1相同之方式製作發泡片。
進行與實施例1相同之評價。
所獲得之片材為氣泡直徑1μm左右之均勻之發泡體,密度為330kg/m3,於表層部具有50μm左右之未發泡層。發泡片於550nm之波長之反射率為98%(Al2O3基準),於350nm之波長之反射率為13%(Al2O3基準)。又,表面固有電阻值為8.62×1010Ω,紫外線照射試驗後之色差△E為8。
比較例1
使用與實施例1相同之複合物,獲得藉由實施例1所記載之方法使於
正面、背面積層有60μm之機能賦予層的厚度為600μm之聚碳酸酯片發泡而成之片材。所獲得之片材表面產生大量氣球狀之凸起,無法獲得可實施光學特性、表面固有電阻值、紫外線照射試驗等評價之樣品。
比較例2
藉由對與實施例1之發泡層相同之複合物添加界面活性劑系抗靜電劑DENON V-57S(丸菱油化工業公司製造)0.5質量%、二苯甲酮系紫外線吸收劑0.25質量%而成之複合物,獲得厚度600μm之單層構造之聚碳酸酯片。獲得藉由實施例1記載之方法使所獲得之片材發泡而成之片材。所獲得之片材之平均氣泡直徑為20μm左右之粗大之氣泡構造,密度為330kg/m3。發泡片於550nm之波長之反射率為96%(Al2O3基準),於350nm之波長之反射率為11%(Al2O3基準)。又,表面固有電阻值為5.57×1010Ω,紫外線照射試驗後之色差△E為9。
將所獲得之結果匯總示於下述表1。
本發明之實施例1、2均具有平均氣泡直徑1μm之微細且均勻之氣泡構造,反射率亦較高。由此可知,藉由使用本發明之熱塑性樹脂微細發泡反射片,作為光反射板、背光面板有用。
以上,將本發明與其實施態樣一併進行了說明,只要本發明者等人未特別指定,則認為於說明之任意細節均不限定本發明者等人之發明,應不違反隨附之申請專利範圍所示之發明精神及範圍而進行廣泛地解釋。
本申請案係主張基於2012年8月9日在日本提出專利申請之日本特願2012-177612之優先權,在此參照該日本專利特願並併入其內容作為本說明書之記載之一部分。
10‧‧‧熱塑性樹脂微細發泡反射片
11‧‧‧發泡層
12‧‧‧非發泡層或包含機能賦予層之非發泡層
13‧‧‧氣泡
Claims (13)
- 一種熱塑性樹脂微細發泡反射片,其係具有發泡層、及於上下夾持該發泡層之厚度為150μm以下且30μm以上之非發泡層者,其特徵在於:該熱塑性樹脂微細發泡反射片係經一體成形而成,該發泡層係具有平均氣泡直徑為10μm以下且0.5μm以上,且氣泡數密度為1×106個/mm3以上且1.0×1012個/mm3以下之均勻氣泡構造的熱塑性樹脂微細發泡體,該非發泡層之至少一者包含厚度小於該非發泡層之厚度的機能賦予層。
- 如申請專利範圍第1項之熱塑性樹脂微細發泡反射片,其中上述機能賦予層係含有抗靜電劑、紫外線吸收劑或抗氧化劑之抗靜電層或紫外線吸收層。
- 如申請專利範圍第2項之熱塑性樹脂微細發泡反射片,其中上述抗靜電劑、紫外線吸收劑或抗氧化劑僅含有於上述機能賦予層,或上述機能賦予層之至少1層所含有之抗靜電劑、紫外線吸收劑或抗氧化劑之含量高於其餘層所含有之含量。
- 如申請專利範圍第1至3項中任一項之熱塑性樹脂微細發泡反射片,其中上述非發泡層均包含上述機能賦予層。
- 如申請專利範圍第1至3項中任一項之熱塑性樹脂微細發泡反射片,其中上述機能賦予層中之樹脂之50質量%以上係由與上述發泡層相同之熱塑性樹脂構成。
- 如申請專利範圍第1至3項中任一項之熱塑性樹脂微細發泡反射片,其中上述熱塑性樹脂為聚碳酸酯。
- 如申請專利範圍第1至3項中任一項之熱塑性樹脂微細發泡反射片,其 於550nm之波長之反射率(氧化鋁製之標準白色板基準)為98%以上。
- 如申請專利範圍第1至3項中任一項之熱塑性樹脂微細發泡反射片,其於350nm之波長之反射率(氧化鋁製之標準白色板基準)為30%以下。
- 如申請專利範圍第1至3項中任一項之熱塑性樹脂微細發泡反射片,其表面固有電阻值為1×1012Ω以下。
- 一種發泡反射片之製造方法,其發泡反射片為申請專利範圍第1至3項中任一項之熱塑性樹脂微細發泡反射片,且包括下述步驟(a)至(c):(a)藉由利用共擠出之一體成型而製備3層構造之樹脂片的步驟,該樹脂片係由用以形成發泡層之熱塑性樹脂層、與用以形成非發泡層之熱塑性樹脂層構成之至少3層構造之樹脂片,該非發泡性層之至少一者包含機能賦予層;(b)使不活性高壓氣體含浸於該樹脂片之步驟;(c)對該樹脂片進行加熱而使用以形成發泡層之熱塑性樹脂層發泡之步驟。
- 如申請專利範圍第10項之發泡反射片之製造方法,其中相對於用以形成發泡層之熱塑性樹脂層之熱塑性樹脂100質量份,調配氣泡化成核劑0.1~10質量份。
- 一種光反射板,其係由申請專利範圍第1至3項中任一項之熱塑性樹脂微細發泡反射片構成。
- 一種背光面板,其具有申請專利範圍第12項之光反射板。
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JP6479745B2 (ja) * | 2016-11-17 | 2019-03-06 | 古河電気工業株式会社 | 音響振動板を兼ねる光反射板を具備するled照明装置、音響振動板を兼ねる光反射板を具備するled照明装置からの音の取り出し方法、ちらつきを抑制することが可能なled照明装置用の音響振動板を兼ねる光反射板 |
JP6310608B1 (ja) * | 2017-06-30 | 2018-04-11 | 古河電気工業株式会社 | 電線用外装体及び外装体付きワイヤーハーネス |
US10208921B1 (en) * | 2017-08-02 | 2019-02-19 | Shenzhen Thousandshores Technology Co., Ltd. | High-reflectivity reflector manufacturing method and high-reflectivity lamp |
CN108819402A (zh) * | 2018-04-28 | 2018-11-16 | 嘉兴领科材料技术有限公司 | 一种多层轻质抗冲聚碳酸酯基微孔发泡复合板材及其制备方法 |
JP6480074B1 (ja) * | 2018-10-10 | 2019-03-06 | 古河電気工業株式会社 | 音響振動板を兼ねる光反射板を具備するled照明装置、及び、音響振動板を兼ねる光反射板を具備するled照明装置からの音の取り出し方法 |
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