TWI811330B - 電子器件用阻隔膜 - Google Patents
電子器件用阻隔膜 Download PDFInfo
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- TWI811330B TWI811330B TW108111541A TW108111541A TWI811330B TW I811330 B TWI811330 B TW I811330B TW 108111541 A TW108111541 A TW 108111541A TW 108111541 A TW108111541 A TW 108111541A TW I811330 B TWI811330 B TW I811330B
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- layer
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- moisture
- barrier
- electronic devices
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Abstract
本發明的課題為提供一種電子器件用阻隔膜,表現出優異的水分遮蔽性,同時其持續性優異。
本發明的解決手段,其特徵為:水分透過率(23℃、RH50%)設定在10-4
g/m2
/day以下,且含水率維持在2000ppm以下。
Description
本發明關於一種阻隔膜,可使用作為以有機電致發光(EL)元件、太陽能電池等為代表的電子器件的密封材。
近年來被開發出來並實際應用的各種電子器件,例如有機電致發光器件(有機EL)、太陽能電池、觸控面板、電子紙等,為了避免因為水分造成電荷的洩漏等,而被要求具有高水分阻隔性。
而用來改善各種塑膠基材的特性,尤其氣體阻隔性的手段,已知有在塑膠基材的表面,藉由蒸鍍,形成由矽氧化物等構成的無機薄膜(無機阻隔層)(專利文獻1),具備這種無機薄膜的膜被廣泛使用作為阻隔膜。這種阻隔膜不能滿足如上述般的電子器件所要求的水分阻隔性,而且塑膠基材所使用的樹脂的殘留水分會使器件顯著劣化。
另外,為了滿足這樣的要求,已知有一種水分阻隔性疊層體,具有疊層了水分捕集層的結構,該水分捕集層是以具有吸濕性的離子性聚合物為基質(專利文獻2)。
如上述般的水分捕集層,是在藉由蒸鍍等形成於塑膠膜表面的無機阻隔層上塗佈含有離子性聚合物的捕集層形成用的塗佈組成物,並使其硬化而成膜之物,藉由形成這種層,表現出優異的水分阻隔性。
然而,就算使用可發揮出高水分阻隔性的阻隔膜,依然沒有解決塑膠基材所使用的樹脂的殘留水分造成器件劣化的課題。
[先前技術文獻]
[專利文獻]
[專利文獻1] 日本特開2000-255579號公報
[專利文獻2] 日本特開2015-96320號
[發明所欲解決的問題]
所以,本發明之目的在於提供一種電子器件用阻隔膜,表現出優異的水分阻隔性,同時抑制塑膠基材所使用的樹脂的殘留水分造成器件劣化,水分阻隔性的持續性優異。
[解決問題的手段]
依據本發明,可提供一種電子器件用阻隔膜,其特徵為:水分透過率(23℃、RH50%)設定在10-4
g/m2
/day以下,且含水率維持在2000ppm以下。
在本發明中,適合採用以下態樣。
(1)前述含水率維持在100ppm以下。
(2)前述阻隔膜具有至少一層無機阻隔層。
(3)前述阻隔膜具有塑膠基材層作為前述無機阻隔層的基底。
(4)前述塑膠基材層是由聚酯樹脂、聚醯亞胺樹脂或環狀烯烴系樹脂形成。
(5)前述阻隔膜具備水分捕集層。
(6)前述水分捕集層為含有離子性聚合物的層。
(7)前述阻隔膜在具有前述塑膠基材層、及設置於該基材層上的前述無機阻隔層,該無機阻隔層上設置有水分捕集層。
(8)前述阻隔膜係以可剝離的方式固持於乾燥劑薄片而保存。
(9)前述阻隔膜被前述乾燥劑薄片夾住。
(10)前述乾燥劑薄片含有分散有乾燥劑的吸濕性樹脂層、及設置於該吸濕性樹脂層的一個表面的表面保護樹脂層,該表面保護樹脂層在40℃、90%RH具有40g/m2
・day以下的水分透過率,而且前述吸濕性樹脂層的另一個表面配置成面對該阻隔膜。
[發明之效果]
本發明之阻隔膜被使用作為各種電子器件的密封材來有效避免水分侵入器件內部,特別重要的特徵在於:水分透過率(23℃、RH50%)設定在10-4
g/m2
/day以下,而且含水率維持在2000ppm以下,甚至100ppm以下。亦即,本發明之阻隔膜具有優異的水分阻隔性,而且含水率維持得非常低,在將其提供使用時,水分含量極少,因此可長期發揮優異的水分阻隔性。
本發明之阻隔膜的水分透過率(23℃、RH50%)設定在10-4
g/m2
/day以下,較佳為10-5
g/m2
/day以下,最佳為10-6
g/m2
/day以下,含水率維持在2000ppm以下,尤其100ppm以下。這種設定在低水分透過率且低含水率的本發明之阻隔膜,藉由設計成具備將多個無機阻隔層重疊或吸收捕捉水分的水分捕集層的多層結構,更能提升對氧等的阻隔性或對水分的阻隔性,可達成提升作為各種器件的密封材的性能。
圖1表示了這種阻隔膜的層結構的一個例子。
在圖1所表示的例子中,全體以1來表示的本發明之阻隔膜,具備了無機阻隔層3,該無機阻隔層3被適當地固持於作為基底層的塑膠基材層5。另外,在無機阻隔層3上,因應必要設置了用來提升水分阻隔性的水分捕集層7。
亦即,本發明之阻隔膜1,只要滿足預定水分透過率及含水率即可,可為無機阻隔層3的單層膜,但在作為要求具有較高水分阻隔性的各種電子器件的密封材來使用的情況,為了滿足所要求的水分阻隔性,是設計成在無機阻隔層1上設置了水分捕集層7的多層結構,這種層全體來說會表現出上述水分透過率,此外,含水率是設定在預定範圍。
<無機阻隔層3>
無機阻隔層3,是以塑膠基材層5作為基底所形成的層,可為例如由日本特開2015-96320號公報等記載的公知的阻隔層,從可確保高氧阻隔性的觀點看來,以藉由濺鍍、真空蒸鍍、離子鍍等為代表的物理蒸鍍或電漿CVD為代表的化學蒸鍍等所形成的無機質蒸鍍膜,例如由各種金屬或金屬氧化物所形成的膜為適合,尤其從即使在具有凹凸的表面也能均勻成膜,不僅是對於氧,對於水分也發揮出優異的阻隔性的觀點看來,以藉由電漿CVD來形成為佳。
此外,利用電漿CVD製得的蒸鍍膜,是藉由在保持在預定真空度的電漿處理室內配置作為無機阻隔層3的基底且為膜形態的塑膠基材層5,使用氣體供給管,將形成膜的金屬或含有該金屬的化合物的氣體(反應氣體)及氧化性氣體(通常為氧或NOx
的氣體)適當地與氬、氦等的載體氣體一起供給至被金屬壁屏蔽且減壓至預定真空度的電漿處理室,在此狀態下,藉由微波電場或高頻電場等來發生輝光放電,以此電能產生電漿,使上述化合物的分解反應物沉積在塑膠基材層5的表面而成膜所得到。
上述反應氣體,一般而言,從可形成在作為基底的基材層5的界面具有含有碳成分的柔軟區域而且在其上具有氧化度高、阻隔性優異的區域的膜的觀點看來,以使用有機金屬化合物,例如三烷基鋁等的有機鋁化合物、或有機鈦化合物、有機鋯化合物、有機矽化合物等的氣體為佳,尤其從能夠較容易、效率良好地形成對氧的阻隔性高的無機阻隔層3的觀點看來,以有機矽化合物為最佳。
這種有機矽化合物的例子,可使用六甲基二矽烷、乙烯基三甲基矽烷、甲基矽烷、二甲基矽烷、三甲基矽烷、二乙基矽烷、丙基矽烷、苯基矽烷、甲基三乙氧基矽烷、乙烯基三乙氧基矽烷、乙烯基三甲氧基矽烷、四甲氧基矽烷、四乙氧基矽烷、苯基三甲氧基矽烷、甲基三甲氧基矽烷、甲基三乙氧基矽烷等的有機矽烷化合物、八甲基環四矽氧烷、1,1,3,3-四甲基二矽氧烷、六甲基二矽氧烷等的有機矽氧烷化合物等。另外,除了這些以外,還可使用胺基矽烷、矽氮烷等。
上述有機金屬化合物可單獨或組合兩種以上來使用。
另外,上述無機阻隔層3的厚度,是因應作為基底的塑膠基材層5的厚度而設定在可滿足預定水分透過率的厚度,一般而言,只要具有4至500nm,尤其30至400nm左右的厚度即可。
此外,上述無機阻隔層3,不限於蒸鍍等的手段,亦可藉由塗佈等形成於塑膠基材層5上。亦即,藉由塗佈形成的無機阻隔層3,若與藉由上述蒸鍍等形成的層作比較,則氧阻隔性等的特性較低,然而亦可依照所要求的對氧等的阻隔性的程度,藉由塗佈來形成無機阻隔層3。
藉由塗佈所形成的無機阻隔層3,是以使用含有聚矽氮烷或聚縮合性的矽烷化合物(例如烷氧基矽烷等)、聚縮合性的氧化鋁化合物(例如烷氧基鋁等)作為成膜成分,並適當地混合有二氧化矽或氧化鋁等的無機微粒子的有機溶劑溶液,將其塗佈於預定面上,然後加熱使有機溶劑揮發而成膜的層為代表。
<塑膠基材層5>
塑膠基材層5如先前所敘述般,是作為後述無機阻隔層3的基底之層,通常是利用熱塑性或熱硬化性的樹脂,因應其形態,藉由射出或共射出成形、擠出或共擠出成形、膜或薄片成形、壓縮成形性、注型聚合等來成形。
一般而言,從成形性或成本等的觀點看來,以熱塑性樹脂為適合。
這種熱塑性樹脂,例如由低密度聚乙烯、高密度聚乙烯、聚丙烯、聚1-丁烯、聚4-甲基-1-戊烯或乙烯、丙烯、1-丁烯、4-甲基-1-戊烯等的α-烯烴彼此的無規或嵌段共聚物等的聚烯烴、環狀烯烴共聚物或環狀烯烴聚合物等的環狀烯烴系樹脂、乙烯・醋酸乙烯酯共聚物、乙烯・乙烯醇共聚物、乙烯・氯乙烯共聚物等的乙烯・乙烯基化合物共聚物、聚苯乙烯、丙烯腈・苯乙烯共聚物、ABS、α-甲基苯乙烯・苯乙烯共聚物等的苯乙烯系樹脂、聚氯乙烯、聚偏二氯乙烯、氯乙烯・偏二氯乙烯共聚物、聚丙烯酸甲酯、聚甲基丙烯酸甲酯等的聚乙烯基化合物、耐綸6、耐綸6-6、耐綸6-10、耐綸11、耐綸12等的聚醯胺、聚對苯二甲酸乙二酯(PET)、聚對苯二甲酸丁二酯、聚萘二甲酸乙二酯(PEN)等的熱塑性聚酯、聚碳酸酯、聚苯醚、或其他還有聚醯亞胺樹脂、聚醯胺醯亞胺樹脂、聚醚醯亞胺樹脂、氟樹脂、烯丙基樹脂、聚胺甲酸乙酯樹脂、纖維素樹脂、聚碸樹脂、聚醚碸樹脂、酮樹脂、胺基樹脂、或聚乳酸等的生物分解性樹脂等所形成。此外,還可為其摻合物或使這些樹脂適當地共聚合而改性的樹脂(例如酸改性烯烴樹脂等)。
另外,基材層5還適合藉由如乙烯・乙烯醇共聚物般氧阻隔性優異的氣體阻隔性樹脂等來形成,亦可進一步具有含有由這種氣體阻隔性樹脂所形成的層的多層結構。
在本發明中,從取得的容易性、成本、成形性、或對氧表現出阻隔性或者多少對氧有阻隔性,甚至從適合作為後述無機阻隔層3的基底的觀點看來,使用聚對苯二甲酸乙二酯(PET)、聚對苯二甲酸丁二酯、聚萘二甲酸乙二酯等的聚酯樹脂、或聚醯亞胺樹脂、環狀烯烴共聚物或環狀烯烴聚合物等的環狀烯烴系樹脂的膜作為基材層5為更適合。
上述塑膠基材層5的厚度並不受特別限制,若此厚度過厚,則此會有阻隔膜1的水分透過率變大,難以滿足前述水分透過率的顧慮。另外,由於阻隔膜1會失去可撓性,因此,該基材層5的厚度通常定在200μm以下,較佳為125μm以下,藉由定在此範圍,阻隔膜1的水分透過率會設定在前述範圍。
<水分捕集層7>
在本發明中,水分捕集層7是遮斷沿該阻隔膜1的厚度方向流過的水分的層,在要求具有高水分阻隔性的情況下設置。
此水分捕集層7只要表現出水分遮斷性,則並未特別限制,在預定樹脂層中使沸石等的吸濕劑分散的層等,本身已周知的層即可。
然而,尤其在要求對水分的高阻隔性的情況,為了實現例如10-5
g/m2
/day以下,甚至10-6
g/m2
/day以下的水分透過率(23℃、RH50%),以藉由日本特開2015-96320號等所揭示的離子性聚合物來形成水分捕集層7為佳,甚至適合以該離子性聚合物作為基質,並使極限濕度低於離子性聚合物的吸濕劑分散於該基質中來形成水分捕集層7。尤其,以這種離子性聚合物為基質者,水分捕捉性優異,此外,分散有極限濕度低的吸濕劑者,能夠有效避免因水分吸收造成的膨潤等的變形。
水分捕集層7的形成所適合使用的離子性聚合物,有陽離子性聚合物與陰離子性聚合物。
陽離子性聚合物,是分子中具有在水中可成為正電荷的陽離子性基,例如1~3級胺基、4級銨基、吡啶基、咪唑基、4級吡啶鎓等的聚合物。這種陽離子性聚合物中,陽離子性基的親核作用強,且藉由氫鍵來捕捉水,因此可形成具有吸濕性的基質。
陽離子性聚合物中的陽離子性基的量,一般而言,只要是使該聚合物的吸水率(JIS K-7209-1984)在濕度80%RH及30℃的環境氣體下為20%以上,尤其30%~45%的量即可。
另外,陽離子性聚合物,可使用使烯丙基胺、乙烯亞胺、乙烯基苄基三甲胺、[4-(4-乙烯基苯基)-甲基]-三甲胺、乙烯基苄基三乙胺等的胺系單體;乙烯基吡啶、乙烯基咪唑等的含氮雜環系單體;及其鹽類;所代表的陽離子性單體的至少一種,適當地與可共聚合的其他單體一起聚合或共聚合,進一步依照必要藉由酸處理使其部分中和所得到之物。
關於這種陽離子性聚合物,在日本特開2015-96320號等有詳細敘述,故其細節省略,一般而言,從成膜性等的觀點看來,以聚烯丙基胺為適合。
另一方面,陰離子性聚合物是分子中具有在水中可成為負電荷的陰離子性官能基的聚合物,陰離子性官能基例如羧基、磺酸基、膦酸基、或這些基被部分中和的酸式鹼。具有這種官能基的陰離子性聚合物中,上述官能基會藉由氫鍵來捕捉水,因此可形成吸濕性基質。
陰離子性聚合物中的陰離子性官能基的量會依照官能基的種類而有所不同,與前述陽離子性聚合物同樣地,只要是使聚合物的吸水率(JIS K-7209-1984)在濕度80%RH及30℃的環境氣體下為20%以上,尤其30%~45%的量即可。
具有如上述般的官能基的陰離子性聚合物,可使用例如使甲基丙烯酸、丙烯酸、馬來酸酐等的羧酸系單體;α-鹵化乙烯基磺酸、苯乙烯磺酸、乙烯基磺酸等的磺酸系單體;乙烯基磷酸等的膦酸系單體;及這些單體的鹽類;等所代表的陰離子性單體的至少一種適當地與可共聚合的其他單體一起聚合或共聚合,進一步因應必要藉由鹼處理使其部分中和所得到之物。
關於這種陰離子性聚合物,也在日本特開2015-96320號等有詳細敘述,故其細節省略,一般而言為聚(甲基)丙烯酸及其部分中和物(例如一部分為Na鹽)。
另外,可藉由摻合至上述離子性聚合物中來適當地防止因膨潤造成變形的吸濕劑,亦即與離子性聚合物相比,極限濕度更低的吸濕劑,可列舉例如在濕度80%RH及溫度30℃的環境條件下極限濕度為6%以下的吸濕劑。亦即,此吸濕劑的極限濕度若高於離子性聚合物,則基質所吸收的水分的封閉不足,容易發生水分的釋放等,在極限濕度低於離子性聚合物的吸濕劑摻合至離子性聚合物中的情況,即使在低濕度的環境氣體下也能夠有效地捕集水分,不僅如此,還可藉由該吸濕劑捕捉離子性聚合物所吸收的水分,因此抑制水分的釋放,可發揮出高水分阻隔性。
另外,如上述般的吸濕劑,一般而言,在濕度80%RH及溫度30℃的環境氣體下具有50%以上的吸水率(JIS K-7209-1984),已知有無機系及有機系吸濕劑。
無機系吸濕劑,可列舉沸石、氧化鋁、活性碳、蒙脫石等的黏土礦物、二氧化矽膠體、氧化鈣、硫酸鎂等。
有機系吸濕劑,可列舉陰離子系聚合物或其部分中和物的交聯物。此陰離子系聚合物,可列舉使羧酸系單體((甲基)丙烯酸或馬來酸酐等)、磺酸系單體(鹵化乙烯基磺酸、苯乙烯磺酸、乙烯基磺酸等)、膦酸系單體(乙烯基磷酸等)及這些單體的鹽類等所代表的陰離子性單體的至少一種聚合或與其他單體共聚合所得到之物。尤其在需要透明性的用途,有機系吸濕劑是有效的。例如以交聯聚(甲基)丙烯酸Na的微細粒子等為代表的有機系吸濕劑。
另外,上述吸濕劑之中,從比表面積變大,表現出高吸濕性的觀點看來,以粒徑小的吸濕劑為佳,(例如平均一次粒徑為100nm以下,尤其80nm以下),尤其粒徑小的有機系聚合物的吸濕劑最合適。
亦即,有機系聚合物的吸濕劑中對於離子性聚合物之基質的分散性極良好,可均勻分散,不僅如此,用來製造該聚合物的聚合法藉由採用乳化聚合或懸浮聚合等,可使其粒子形狀微細且為均勻的球形,將其摻合某程度以上,可確保極高的透明性。
另外,有機系微細吸濕劑中,前述極限濕度非常低,而表現出高吸濕性,不僅如此,藉由交聯,可使因膨潤造成的體積變化極小,所以,從抑制體積變化,同時使環境氣體濕度降低至完全乾燥狀態或接近完全乾燥狀態上看來為最適。
這種有機系吸濕劑的微粒子,例如交聯聚丙烯酸Na微粒子(平均粒徑約70nm)以膠體分散液(pH=10.4)的形式,由東洋紡股份有限公司以名為TAFTIC HU-820E的商品在市面販售。
在本發明中,如上述般的吸濕劑的量,從充分發揮其特性,有效抑制水分阻隔性的顯著的提升及因膨潤造成的尺寸變化,同時長期確保水分阻隔性高於無機阻隔層3所表現出的阻隔性的觀點看來,可因應離子性聚合物的種類來設定。
例如在使上述吸濕劑分散在陽離子性聚合物中而形成水分捕集層7的情況,一般而言,陽離子性聚合物每100質量份,吸濕劑為50質量份以上,尤其以100至900質量份的量存在為佳,甚至以200至600質量份的量為較佳。另外,在使吸濕劑分散在陰離子性聚合物中的情況,陰離子性聚合物每100重量份,吸濕劑為50重量份以上,尤其以100至1300重量份的量存在為佳,甚至以150至1200重量份的量為較佳。
另外,使用如上述般的離子性聚合物所形成的水分捕集層7,以在離子性聚合物導入交聯結構為適合。亦即,若離子性聚合物中導入了交聯結構,則吸收水時,離子性聚合物的分子會因為交聯而互相拘束,抑制了因膨潤(水分吸收)造成的體積變化,而帶來機械強度或尺寸安定性的提升。
這種交聯結構,可藉由在用來形成水分捕集層7的塗佈組成物中摻合交聯劑來導入。尤其在陰離子性聚合物的情況,與陽離子性聚合物不同地,僅利用氫鍵來捕捉水,因此藉由將適合於吸濕的空間網狀結構(交聯結構)導入基質中,可大幅提高其吸濕性。
用來導入這種交聯結構的交聯劑,在陽離子性聚合物導入交聯結構的情況與在陰離子性聚合物導入交聯結構的情況會有若干不同。
陽離子性聚合物用的交聯劑,可使用例如日本特開2015-96320號等所記載般,具有可與陽離子性基反應的交聯性官能基(例如環氧基)及經過水解與脫水縮合而可在交聯結構中形成矽氧烷結構的官能基(例如烷氧基矽基)的化合物,具體而言,適合使用下述式(1)所表示之矽烷化合物:
X-SiR1 n
(OR2
)3-n
(1)
式中,X為末端具有環氧基的有機基,
R1
及R2
分別為甲基、乙基、或異丙基,
n為0、1、或2。
這種矽烷化合物具有環氧基與烷氧基矽基作為官能基,環氧基會與陽離子性聚合物的官能基(例如NH2
)進行加成反應。另一方面,烷氧基矽基會因為水解而產生矽醇基(SiOH基),經過縮合反應,形成矽氧烷結構,並且成長,最終在陽離子性聚合物鏈間形成交聯結構。藉此,可在陽離子性聚合物的基質導入具有矽氧烷結構的交聯結構。
而且,陽離子性聚合物為鹼性,結果,在塗佈含有陽離子性聚合物的塗佈組成物而形成水分捕集層B時,陽離子性基與環氧基的加成反應或矽醇基間的脫水縮合也會迅速促進,可輕易地導入交聯結構。
在本發明中,適合使用上述式(1)中之具有環氧基的有機基X以γ-縮水甘油醚氧基烷基為代表,例如γ-縮水甘油醚氧基丙基三甲氧基矽烷或γ-縮水甘油醚氧基丙基甲基二甲氧基矽烷來作為交聯劑。
另外,上述式(1)中的環氧基為如環氧環己基般的脂環式環氧基的化合物,也適合作為交聯劑。例如,在使用如β-(3,4-環氧環己基)乙基三甲氧基矽烷般的具有脂環式環氧基的化合物作為交聯劑的情況,在基質的交聯結構中,與矽氧烷結構一起導入了脂環結構。這種脂環結構的導入,能夠更有效地發揮形成適合於吸濕的空間網狀結構這樣的基質的機能。
此外,為了在上述交聯結構中導入脂環結構,可使用具有多個環氧基與脂環基的化合物作為交聯劑,例如下述式(2)所表示的二縮水甘油基酯:
G-O(C=O)-A-(C=O)O-G (2)
式中,G為縮水甘油基,
A為具有脂肪族環的二價烴基,例如環伸烷基。這種二縮水甘油基酯的代表性的例子,如下述式(2-1)所表示。
[化1]
亦即,式(2)的二縮水甘油基酯不具有烷氧基矽基,然而在交聯結構中導入了脂環結構,因此考量在基質中形成適合於吸濕的空間網狀結構這點是有效果的。
上述交聯劑,希望以陽離子性聚合物每100重量份,交聯劑為5至60重量份,尤其15至50重量份的量來使用,這種交聯劑的至少70重量%以上,宜為80重量%以上,希望為前述式(1)的矽烷化合物。
另外,用來在陰離子性聚合物導入交聯結構的交聯劑,依然如日本特開2015-96320號等所記載般,可使用具有兩個以上可與陰離子性聚合物所具有的離子性基反應的交聯性官能基(例如環氧基)的化合物,可理想地使用也就陽離子性基質用的塗佈組成物列舉的式(2)表示的二縮水甘油基酯:
G-O(C=O)-A-(C=O)O-G (2)
式中,G為縮水甘油基,
A為具有脂肪族環的二價烴基,例如環伸烷基。
亦即,上述式(2)的二縮水甘油基酯之中,環氧基會與陰離子性基反應,在基質中會形成含有由二價基A產生的脂環結構的交聯結構。藉由含有這種脂環結構的交聯結構,可帶來膨潤的抑制效果。
尤其,上述二縮水甘油基酯之中,適合的例先前也列舉了,特別是從可形成適合於吸濕的空間網狀結構的觀點看來,先前的式(2-1)所表示的二縮水甘油基酯為最適合。
這種陰離子聚合物用的交聯劑,希望以陰離子性聚合物每100重量份,交聯劑為1至50重量份,尤其10至40重量份的量來使用。
水分捕集層7的形成,是藉由塗佈使預定吸濕性的聚合物或吸濕劑等溶解或分散於有機溶劑而得的塗佈組成物,加熱成膜之後,在乾燥環境氣體中,保持在減壓下,使存在於所形成的層中的水分釋放而形成。
另外,還可藉由將如上述般的塗佈組成物塗佈於其他有機膜,同樣地形成水分捕集層7,然後使用乾式層合黏接劑等,將該水分捕集層7黏接於形成於上述疊層膜的無機阻隔層3來形成。此情況下,在圖1的水分捕集層7上形成水分捕集層7時,作為基底的膜是以有機層的方式來形成,並且在無機阻隔層3與水分捕集層7之間隔著黏接劑層。
本發明之阻隔膜1如先前所敘述般,水分透過率設定在極小的預定範圍。亦即,為了將水分透過率設定在預定範圍,不受上述圖1所示的層結構限定,可設計成例如形成多個無機阻隔層3與水分捕集層7的層結構。這種結構,可藉由適當地使用乾式層合黏接劑等使多片具有圖1的層結構的疊層體(阻隔膜1)互相黏接來得到。
<阻隔膜1的含水率>
本發明之阻隔膜1的水分透過率被設定在極小的預定範圍,為了使這種因水分透過率所產生的阻隔性充分發揮,含水率必須維持在2000ppm以下,宜為1000ppm以下,更佳為100ppm以下。亦即,含水率如果沒有被設定在小的範圍,則在使用於電子器件的密封時,難以將器件內部保持在乾燥狀態。
上述阻隔膜1中的水分捕集層7,在成膜時經過乾燥處理,而成為如上述般的含水率,然而這樣的狀態下,直到實際使用時,會徐緩地吸收大氣中的水分,結果含水率會高於上述範圍。
因此,本發明之阻隔膜1必須以直到實際使用時含水率都不會增大的方式來保存。
此外,含水率可由將阻隔膜1保持在完全乾燥狀態時的重量與測定時的重量差(亦即含水量),依照下述式輕易地計算。
含水率(%)=100×(A-B)/B
式中,A為阻隔膜1的測定重量,
B為阻隔膜1經加熱乾燥時的重量。
這種保存形態,可列舉例如將上述阻隔膜1真空包裝在由表面具有熱封層的金屬箔(例如鋁箔)構成的包裝膜所形成的小袋子內部,最簡便的保存形態適合採用圖2所示的保存形態。
在圖2之中,兩片乾燥劑薄片13、13以可剝離的方式貼附於上述本發明之阻隔膜1。亦即,藉由此乾燥劑薄片13、13,可有效防止水分由外部侵入阻隔膜1中,而且可將存在於阻隔膜1中的水分吸收除去,藉此,可將阻隔膜1的含水率維持在上述範圍內。
圖2之中所使用的乾燥劑薄片13,亦可使用二氧化矽膠體等的乾燥劑分散在樹脂中的周知產品,為了更確實地將含水率維持在前述範圍,適合使用圖3所示的結構的乾燥劑薄片13。
在圖3之中,此乾燥劑薄片13,具有吸濕性樹脂層15、及設置於吸濕性樹脂層15的其中一面的表面保護樹脂層17,吸濕性樹脂層15的另一個表面(並未設置表面保護樹脂層17的一面)會成為吸濕性機能面19,此面19被貼附於阻隔膜1。
在該乾燥劑薄片13之中,吸濕性樹脂層15是分散有乾燥劑的樹脂層,乾燥劑可使用本身已周知的無機系或有機系的乾燥劑。
無機系的乾燥劑,可列舉沸石、氧化鋁、活性碳、蒙脫石等的黏土礦物、二氧化矽膠體、氧化鈣、氧化鋇、氯化鈣、硫酸鎂等。
有機系的乾燥劑,可列舉陰離子系聚合物或其部分中和物的交聯物。作為此陰離子系聚合物,可列舉使羧酸系單體((甲基)丙烯酸或馬來酸酐等)、磺酸系單體(鹵化乙烯基磺酸、苯乙烯磺酸、乙烯基磺酸等)、膦酸系單體(乙烯基磷酸等)及這些單體的鹽類等為代表的陰離子性單體的至少一種聚合或與其他單體共聚合所得到之物。
在本發明中,從可有效地捕捉由阻隔膜1釋放出的水分的觀點看來,與沸石或二氧化矽膠體等的藉由物理吸附來捕捉水分的乾燥劑相比,更適合使用利用與水的反應表現出化學吸附性的乾燥劑,例如氧化鈣。
另外,上述乾燥劑,從可在樹脂中均勻分散且比表面積大的觀點看來,以粒徑小為佳,例如以雷射繞射散射法測得的按體積換算的平均一次粒徑(D50)以20μm以下為適合,並且通常係以基質樹脂每100質量份,乾燥劑為5~80質量份的量分散於吸濕性樹脂層15中為適合。
此外,就上述吸濕性樹脂層15中之基質樹脂而言,並未特別限制,可使用周知的熱塑性樹脂,一般而言,從對後述表面保護樹脂層17或阻隔膜1的貼附性或成本等的觀點看來,適合使用烯烴系樹脂,例如低密度聚乙烯、高密度聚乙烯、聚丙烯、聚1-丁烯、聚4-甲基-1-戊烯或乙烯、丙烯、1-丁烯、4-甲基-1-戊烯等的α-烯烴彼此的無規或嵌段共聚物、或環狀烯烴共聚物等。在本發明中,上述烯烴系樹脂之中,尤其從吸濕性低、可有效防止來自吸濕性樹脂層15的水分釋放,防止乾燥劑在使用前失活的觀點看來,以低密度聚乙烯(LDPE)、直鏈低密度聚乙烯(LLDPE)、聚丙烯(PP)及其摻合物為適合,其中,以低密度聚乙烯(LDPE)及直鏈低密度聚乙烯(LLDPE)為佳。
另外,表面保護樹脂層17是為了防止水分由環境氣體中侵入吸濕性樹脂層15中的層,為了確保這樣的水分阻隔性,在40℃、90%RH的水分透過率必須為40g/m2
/day以下,尤其20g/m2
/day以下。亦即,若其水分透過率高,則在實施後述乾燥處理前的製造步驟或處理的階段,因為水分會由環境氣體中侵入而導致吸濕性樹脂層15中的乾燥劑的吸濕性在短時間內受到損害。
形成表面保護樹脂層17的樹脂只要可確保如上述般的水分透過率,則不特別限制,從以薄的厚度即可滿足上述水分透過率的觀點看來,以吸濕性樹脂層15的形成所使用的烯烴樹脂、或聚對苯二甲酸乙二酯(PET)、聚對苯二甲酸丁二酯、聚萘二甲酸乙二酯(PEN)等的熱塑性聚酯為適合,較佳為使用烯烴系樹脂,從與吸濕性樹脂層15的黏接性良好的觀點看來,以乙烯系樹脂或丙烯系樹脂為最適合。
藉由使用如上述般的樹脂形成表面保護樹脂層17,並將其厚度定為例如40μm以下,尤其30μm以下,可滿足預定的水分透過率。
可由上述說明來理解,本發明所使用的乾燥劑薄片13,是藉由表面保護樹脂層17來防止水分由環境氣體中侵入吸濕樹脂層15中,另外,吸濕性樹脂層17的另一面會成為吸濕性機能面19,由該面19侵入的水分會被乾燥劑捕捉。
在本發明中,將這種乾燥劑薄片13的吸濕性機能面19貼附於阻隔膜1,如圖2所示般,藉由將阻隔膜1以乾燥劑薄片13夾住,可將阻隔膜1的含水率維持在預定範圍。
此外,在將阻隔膜1捲繞在輥筒來保管的情況,乾燥劑薄片13只要設置於水分捕集層7這面即可,沒有必要將阻隔膜1以乾燥劑薄片13夾住。
此外,乾燥劑薄片13的貼附,可利用形成了吸濕性機能面19的樹脂的黏連性,暫時將吸濕性機能面直接貼附於阻隔膜1的表面,但一般而言,從確實防止保管、搬運時等的剝離等的不良狀況看來,適合使用黏著劑來貼附。
在使用這種黏著劑貼附於阻隔膜1的情況,在吸濕性機能面19與阻隔膜1之間形成了黏著劑層,而此黏著劑層(在圖2中並未表示)不能阻礙吸濕性機能面19的吸濕性,所以此黏著劑層的水分透過率必須高於前述表面保護樹脂層17,例如在40℃、90%RH的水分透過率為40g/m2
/day以上,尤其60g/m2
/day以上。
上述黏著劑可使用(甲基)丙烯酸系黏著劑、胺甲酸乙酯系黏著劑等的周知黏著劑,只要藉由這些黏著劑形成一定厚度以下(例如30μm以下)的黏著劑層以確保如上述般的水分透過率即可。
另外,乙烯・醋酸乙烯酯共聚物(EVA)、軟質聚烯烴(LLDPE)、茂金屬聚烯烴系彈性體等亦可作為黏著劑來使用。
另外,上述黏著劑對於貼附該乾燥劑薄片13的阻隔膜1的表面的黏著力以調整在0.3N/25mm以下為佳。這是因為若此黏著力過高,則將乾燥劑薄片13剝離時,會有損傷阻隔膜1的表面(例如水分捕集層表面)的顧慮。
此外,黏著力的調整,可因應貼附乾燥劑薄片13的阻隔膜1的表面的材質,在形成黏著劑的高分子中導入交聯結構,或在黏著劑中摻合滑劑等來進行。
上述乾燥劑薄片13,例如可使用吸濕性樹脂層15形成用的含乾燥劑的樹脂組成物與表面保護樹脂層17形成用的樹脂,藉由共擠出而輕易地成形,在使用黏著劑的情況,只要在上述形成的吸濕性樹脂層15的表面以輥塗法塗佈黏著劑或塗佈含有溶劑的黏著劑塗佈組成物,並適當地乾燥即可。另外,還可藉由與作為黏著劑使用的樹脂的三層共擠出來成形。
<用途>
本發明之阻隔膜1,水分透過率被抑制在極小的範圍,而表現出優異的水分阻隔性,藉由將其加熱乾燥之後,例如,如上述般以乾燥劑薄片13夾住來保管,其含水率可長期維持在2000ppm以下。例如,將如圖2般兩片乾燥劑薄片13夾住阻隔膜1後放置於大氣中時,確認了阻隔膜1的含水率數個月以上都維持在600ppm以下。
所以,如上述般維持在低含水率的阻隔膜1,在將乾燥劑薄片13剝離之後,可使用作為預定電子器件的密封材。例如藉由使用感壓黏著劑等將此阻隔膜1貼附於器件,並將該器件封住,可將此器件內部保持在乾燥狀態。亦即,本發明之阻隔膜1可供在含水率維持在非常低的範圍的狀態下使用,因此可長期發揮其優異的水分阻隔性,因此可將器件內部安定地保持在乾燥狀態。
本發明之阻隔膜1所能夠適用的電子器件並未特別限制,可適用於有機EL元件、太陽能電池、觸控面板、電子面板等,尤其是忌水分造成漏電的有機器件等各種電子器件。
1‧‧‧阻隔膜
3‧‧‧無機阻隔層
5‧‧‧塑膠基材層
7‧‧‧水分捕集層
13‧‧‧乾燥劑薄片
15‧‧‧吸濕性樹脂層
17‧‧‧表面保護樹脂層
19‧‧‧吸濕性機能面
圖1表示本發明之阻隔膜的層結構的一例的概略側剖面圖。
圖2表示本發明之阻隔膜的保存形態的一例之圖。
圖3表示本發明之阻隔膜的保存所使用的乾燥劑薄片的層結構的一例的概略剖面圖。
Claims (10)
- 一種電子器件用阻隔膜,其特徵為:水分透過率(23℃、RH50%)設定在10-4g/m2/day以下,且含水率維持在2000ppm以下;該阻隔膜係以黏著劑貼附於乾燥劑薄片;且該阻隔膜係以可剝離的方式固持於該乾燥劑薄片而保存。
- 如請求項1之電子器件用阻隔膜,其中該含水率維持在100ppm以下。
- 如請求項1之電子器件用阻隔膜,其中該阻隔膜具有至少一層無機阻隔層。
- 如請求項3之電子器件用阻隔膜,其中該阻隔膜具有塑膠基材層作為該無機阻隔層的基底。
- 如請求項4之電子器件用阻隔膜,其中該塑膠基材層係由聚酯樹脂、聚醯亞胺樹脂或環狀烯烴系樹脂形成。
- 如請求項1之電子器件用阻隔膜,其中該阻隔膜具備水分捕集層。
- 如請求項6之電子器件用阻隔膜,其中該水分捕集層為含有離子性聚合物的層。
- 如請求項4之電子器件用阻隔膜,其中該阻隔膜具有該塑膠基材層及設置於該基材層上的該無機阻隔層,並在該無機阻隔層上設置有水分捕集層。
- 如請求項1之電子器件用阻隔膜,其中該阻隔膜被該乾燥劑薄片夾住。
- 如請求項1之電子器件用阻隔膜,其中該乾燥劑薄片含有分散有乾燥劑的吸濕性樹脂層及設置於該吸濕性樹脂層的一個表面的表面保護樹脂層,該表面保護樹脂層在40℃、90%RH具有40g/m2.day以下的水分透過率,而且該吸濕性樹脂層的另一個表面配置成面對該阻隔膜。
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