JP5599462B2 - 水溶性バインダを含む透明導電フィルム - Google Patents
水溶性バインダを含む透明導電フィルム Download PDFInfo
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- JP5599462B2 JP5599462B2 JP2012520582A JP2012520582A JP5599462B2 JP 5599462 B2 JP5599462 B2 JP 5599462B2 JP 2012520582 A JP2012520582 A JP 2012520582A JP 2012520582 A JP2012520582 A JP 2012520582A JP 5599462 B2 JP5599462 B2 JP 5599462B2
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- Prior art keywords
- transparent conductive
- coating
- conductive film
- silver nanowires
- transparent
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Images
Classifications
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Description
T/R比=(全透過率%)/(膜面抵抗率)
用語「導電層」または「導電フィルム」は、水溶性ポリマ・バインダ内に分散された銀ナノワイヤを含むネットワーク層を表す。
銀ナノワイヤは、導電フィルム、および導電フィルムを使用して調製される物品に、導電率を付与する本質的な成分である。透明導電フィルムの導電率は、a)単一のナノワイヤの導電性、b)端子間のナノワイヤの数、およびc)ナノワイヤ間の接続性によって主として制御される。あるナノワイヤ濃度(パーコレーションしきい値とも表す)より下で、端子間の導電性は0であり、ナノワイヤが遠く離れて間隔をあけるので提供される連続的な電流路がないからである。この濃度より上で、使用できる少なくとも1つの電流路がある。より多くの電流路が提供されると、層の全抵抗は減少する。しかし、より多くの電流路が提供されると、導電フィルムの光透過率の割合は、ナノワイヤによる光吸収および散乱により減少する。また、導電フィルム内の銀ナノワイヤの量が増加すると、透明フィルムのヘイズは、銀ナノワイヤによる光散乱により増加する。同様の効果が、導電フィルムを使用して調製した透明物品で生じる。
透明導電フィルムのための実際の製造工程については、コーティング溶液内に銀ナノワイヤなどの導電性成分とポリマ・バインダとの両方を有することが望ましく、重要である。水溶性ポリマ・バインダ溶液は、銀ナノワイヤの分散を促進するための分散剤として、および銀ナノワイヤの堆積がコーティング工程の間に全然生じないように銀ナノワイヤ・コーティング分散体を安定させるための粘性剤として2重の役割を果たす。これは、コーティング工程を単純化し、ワンパス・コーティングを可能にし、第1のコーティング露出銀ナノワイヤの現在使用されている方法が、透明導電フィルムを形成するために続いてポリマで過剰に被覆される弱く脆弱なフィルムを形成することを回避する。水溶液からのコーティングは、環境のため利益になり、製造中に揮発性有機化合物の放出を低減する。
透明導電層用の水性コーティング調合物は、様々な成分を水中で1以上のポリマ・バインダと混合することによって、またはメタノール、エタノール、プロパノール、またはアセトンなどの少量の水混和性溶媒と混合することによって調製することができる。銀ナノワイヤを含む透明フィルムは、線巻きロッドコーティング、浸漬コーティング、エア・ナイフ・コーティング、カーテン・コーティング、スライド・コーティング、スロット−ダイ・コーティング、ロール・コーティング、グラビア・コーティング、または押出コーティングなどの様々なコーティング手順を使用して水性溶媒調合物を被覆することによって調製することができる。界面活性剤および他のコーティング助剤は、コーティング調合物に含めることができる。
1つの実施形態では、導体材料は支持体上に被覆される。支持体は硬質または可撓性であってもよい。
透明導電物品は、線巻きロッドコーティング、浸漬コーティング、エア・ナイフ・コーティング、カーテン・コーティング、スライド・コーティング、スロット−ダイ・コーティング、ロール・コーティング、グラビア・コーティング、または押出コーティングなどの様々なコーティング手順を使用して、透明支持体上に上記水性溶媒系調合物を被覆することによって調製することができる。
次の実施例で使用される材料はすべて、別段の定めがない限り、Aldrich Chemical社(ウィスコンシン州、ミルウォーキー)などの標準の商用ソースから容易に入手可能である。別段表されていない限り、すべての割合は重量による。次のさらなる方法および材料を使用した。
表面抵抗率は、Electronic Design To Market社(オハイオ州、トリード)から入手可能なR−CHEKモデルRC2175表面抵抗率計を使用して測定した。
透過率(%)は、BYK−Gardner(メリーランド州、コロンビア)から入手可能なHaze−gard Plus Hazemeterを使用して、従来の手段によってASTM D1003に従って測定した。一貫した透過率測定を提供するために、各実施例のサンプルのすべては、同じロットの支持体に被覆した。
ASTM D3359−92Aに従って行う「クロス・ハッチ」接着テストを使用してサンプルを評価した。被覆フィルムは、クロス・ハッチ・パターンで、カミソリ刀で切断し、1インチ(2.54cm)の広い片の市販の3Mタイプ610半透明粘着テープをパターン上に置き、その後、素早く外した。フィルム上に残されたコーティング量は、接着量である。接着テスト評価は0〜5であり、0はコーティングの完全除去を称し、5はコーティングのどれも除去されていないことを表す。「3」以上の評価が許容可能であると考えられる。3Mタイプ610半透明粘着テープが、3M社(ミネソタ州、メープルウッド)から得られた。
(透明導電フィルムの調製;実施例1、4、5および6)
ポリマ・プレミックス溶液0.5gに、表2に以下に示すように、脱イオン水0.4g、銀ナノワイヤ分散体を含む2−プロパノール(5.09%銀ナノワイヤ)0.10g、およびZonyl FS−300の0.01gを添加した。
ポリマ・プレミックス溶液0.5gに、表2に以下に示すように、脱イオン水0.3g、銀ナノワイヤ分散体を含む2−プロパノール(5.09%銀ナノワイヤ)0.10gを添加した。
表3に示すように調製した、50℃で溶解したゼラチン・プレミックス溶液0.4gに、脱イオン水0.7g、1%Larostat264Aを含む脱イオン水0.016g、1%BVSM(ゼラチン架橋剤)を含む水0.05g、銀ナノワイヤ分散体を含む2−プロパノール(5.5%銀ナノワイヤ)0.1gを添加した。
銀ナノワイヤ溶液に添加した1%BVSM溶液を1%P382溶液0.096gを含む脱イオン水と交換したこと以外、実施例7、8および9に関してこのフィルムを調製した。
ポリマ・プレミックス0.5gの溶液に、表3に示すように、脱イオン水0.3gおよび銀ナノワイヤ分散体を含む2−プロパノール(5.5%銀ナノワイヤ)0.1gを添加した。
この導電フィルムを2層構造として調製した。第1のコーティング層を以下のように調製した。4%ポリマ・プレミックス5gを、表3に示されるように調製し、脱イオン水3.0gおよび30%グリオキサルを含む水0.15gに添加した。溶液を、♯10マイヤー棒を使用して、4ミル(102μm)の透明ゲル下塗りポリエチレン・テレフタレート支持体上に被覆した。結果生じるコーティングを、205°F(96.1℃)で5分間乾燥した。
Claims (3)
- ゼラチンおよび架橋剤を含む透明水溶性ポリマ内に分散された銀ナノワイヤのランダムネットワークを含み、前記架橋剤がビニルスルフォンを含み、前記ゼラチンが前記架橋剤により架橋されている、透明導電フィルム。
- 透明導電物品であって、
被覆された透明ポリエチレン・テレフタレート支持体と、
500Ω/sq以下の表面抵抗率をもたらすのに十分な量で、ゼラチン・バインダおよび架橋剤内に分散された20〜3300のアスペクト比、および350nm〜1100nmの全スペクトル範囲にわたって少なくとも70%の透過率を有する銀ナノワイヤのランダムネットワークを含む透明導電フィルムと、
を含み、
前記透明ポリエチレン・テレフタレート支持体は、前記透明導電フィルムにより被覆されており、
前記架橋剤がビニルスルフォンを含み、前記ゼラチンが前記架橋剤により架橋されている、透明導電物品。 - 透明導電物品の形成の方法であって、
500Ω/sq以下の表面抵抗率をもたらすのに十分な量でゼラチン・バインダおよび架橋剤内に分散された500〜1000のアスペクト比、および350nm〜1100nmの全スペクトル範囲にわたって少なくとも70%の透過率を有する銀ナノワイヤの分散体を調製すること、
透明ポリエチレン・テレフタレート支持体上に前記分散体を被覆すること、
前記支持体上のコーティングを乾燥し、それによって銀ナノワイヤのランダムネットワークを形成すること、
を含み、
前記架橋剤がビニルスルフォンを含み、前記ゼラチンが前記架橋剤により架橋されている、方法。
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JP5609008B2 (ja) | 2009-05-12 | 2014-10-22 | コニカミノルタ株式会社 | 透明導電フィルム、透明導電フィルムの製造方法及び電子デバイス用透明電極 |
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- 2010-03-19 KR KR20127001156A patent/KR20120050431A/ko not_active Application Discontinuation
- 2010-03-19 CN CN201080030067XA patent/CN102481757A/zh active Pending
- 2010-03-19 WO PCT/US2010/000822 patent/WO2011008227A1/en active Application Filing
- 2010-03-19 US US13/382,232 patent/US8962131B2/en not_active Expired - Fee Related
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US8962131B2 (en) | 2015-02-24 |
WO2011008227A1 (en) | 2011-01-20 |
US20120107598A1 (en) | 2012-05-03 |
JP2012533847A (ja) | 2012-12-27 |
EP2454089A1 (en) | 2012-05-23 |
CN102481757A (zh) | 2012-05-30 |
KR20120050431A (ko) | 2012-05-18 |
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