JP4358145B2 - 透明導電体の製造方法 - Google Patents
透明導電体の製造方法 Download PDFInfo
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- JP4358145B2 JP4358145B2 JP2005105414A JP2005105414A JP4358145B2 JP 4358145 B2 JP4358145 B2 JP 4358145B2 JP 2005105414 A JP2005105414 A JP 2005105414A JP 2005105414 A JP2005105414 A JP 2005105414A JP 4358145 B2 JP4358145 B2 JP 4358145B2
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- transparent conductor
- conductive particles
- binder
- group
- substrate
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- PORWMNRCUJJQNO-UHFFFAOYSA-N tellurium atom Chemical compound [Te] PORWMNRCUJJQNO-UHFFFAOYSA-N 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 239000006097 ultraviolet radiation absorber Substances 0.000 description 1
- 238000001291 vacuum drying Methods 0.000 description 1
- 229910052724 xenon Inorganic materials 0.000 description 1
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
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Description
[式(1)〜(3)中、n、m及びpはそれぞれ正の整数を示す。]
[式(5)中、R1は、二価の炭化水素基を示し、R2は、水素原子、若しくはメチル基を示す。]
まず、本発明の透明導電体の第1実施形態について説明する。
混合工程は、導電性粒子11に上記バインダーを加えて、液体中で混合し混合液とする工程である。なお、斯かる工程は任意であり、必ずしも本発明に必須の工程ではない。
上記バインダーは、特に限定されないが、疎水性であり、重合性官能基と、上記一般式(1)〜(4)に表される置換基からなる群より選ばれる少なくとも1種の置換基と、を分子内に有するモノマーを重合させたものであることが好ましい。
本実施形態に係る導電性粒子11は、ゼータ電位の絶対値が70以下である。このため、当該導電性粒子を導電性粒子をバインダー中に均一に分散させずにバインダー中で凝集させることができる。
[式(6)中、qは正の整数を示す。]
塗布工程は、上述した混合液を基体上に塗布する工程である。
基体は、後述する高エネルギー線及び可視光に対して透明な材料で構成されるものであれば特に限定されない。すなわち基体は公知の透明フィルムでよく、例えば、ポリエチレンテレフタレート(PET)等のポリエステルフィルム、ポリエチレンやポリプロピレン等のポリオレフィンフィルム、ポリカーボネートフィルム、アクリルフィルム、ノルボルネンフィルム(JSR(株)製、アートンなど)等が挙げられる。樹脂フィルムの他に、基体として、ガラスを用いることもできる。
沈降工程は、凝集した導電性粒子を沈降させる工程である。なお、斯かる工程は任意であり、必ずしも本発明に必須の工程ではない。
硬化工程は、上記基体11上に塗布された混合液を硬化させる工程である。ここで、混合液を硬化させるとは、混合液中のバインダーを硬化させることである。斯かるバインダーを硬化させることにより、バインダーのみならず導電性粒子も固定させることができる。
次に、本発明のタッチパネルの第2実施形態について説明する。なお、第1実施形態と同一又は同等の構成要素には同一符号を付し、重複する説明を省略する。
本実施形態で用いられるバインダーは親水性であれば特に限定されないが、水溶性モノマー又は乳化作用を有するモノマーを少なくとも含むモノマーから重合されたものであることが好ましい。この場合、十分に親水性を示すバインダーとすることができる。
導電性粒子は、水酸基を有する導電粉の表面を表面処理剤で処理したものである。したがって、斯かる導電性粒子は疎水性を示す。また、当該導電粉が透明導電性酸化物材料から構成されること、ゼータ電位の絶対値、導電粉の平均粒径、及び導電粉の比表面積は第1実施形態で述べたことと同様である。
塩化インジウム四水和物(関東化学社製)19.9g及び塩化第二錫(関東化学社製)2.6gを水980gに溶解した水溶液と、アンモニア水(関東化学社製)を水で10倍に希釈したものとを調製しながら混合し、白色の沈殿物(共沈物)を生成させた。
ガラス基板上に10cm×30cm角のポリエチレンテレフタレート(PET)フィルム(基体、帝人株式会社製、厚さ100μm)の一端を両面粘着テープを用いて貼り付け、ガラス基板上に基体を固定した。
ガラス基板上に10cm×30cm角のポリエチレンテレフタレート(PET)フィルム(基体、帝人株式会社製、厚さ100μm)の一端を両面粘着テープを用いて貼り付け、ガラス基板上に基体を固定した。
図2に示すように50mm角形状の開口部を有するPTFE容器20の内部に50mm角のポリエチレンテレフタレート(PET)フィルム21(基体、帝人株式会社製、厚さ100μm)を設置し、その露出面側に実施例1と同様の混合液22を硬化後の膜厚が50μmになるようにスポイトで滴下し、直ちに、高速遠心機(日立工機株式会社製 CR20B2)を用いて遠心加速度5000gを与えた。そして、上記フィルム21と同一材質の基板13を、図2の矢印A方向からPTFE容器20内に入れ、混合液22の上に基板13を載せ、フィルム21と基板13とで混合液22を挟み、積層体を形成した。そして、この積層体に対し、高圧水銀灯を光源として積算照度量3000mJ/cm2とするUV照射を行うことにより混合液22を硬化させてフィルム21と基板13との間に導電層を形成し、その後、この積層体を図2の矢印B方向に引き上げ、80℃85%RH環境下にて1時間放置した。そして、導電層からフィルム21を分離することにより透明導電体Cを得た。なお、本実施例で用いた透明導電粒子を透明導電粒子Cといい、混合液を混合液Cという。
実施例1において、ITO粉に対し、表面処理剤で処理しなかったこと以外は実施例1と同様にして、透明導電体Dを得た。なお、本比較例で用いた透明導電粒子を透明導電粒子Dといい、混合液を混合液Dという。
(ゼータ電位)
各実施例及び比較例で用いた導電性粒子A〜D0.1gを各実施例及び比較例で用いた混合液A〜D10gに混ぜ、測定直前まで超音波分散機で分散を行った。そして、このサンプルを適宜取り分け、これを0.2μmまたはそれ以下の孔径をもつフィルターでろ過した上記混合液A〜Dで希釈した。この希釈液をゼータ電位測定器(大塚電子社製:ELS−8000)内の測定セルに挿入し、散乱光をモニターした。光量値がND値1〜3%において10000cps±2000cpsであることを確認し、印加電圧100Vとしてゼータ電位を測定した。得られた結果を表1に示す。
上記実施例1〜3及び比較例1で得られた透明導電体A〜Dを50mm角に切り取り、ITO面の予め定められた測定点につき、四端子四探針式表面抵抗測定器(三菱化学社製MCP−T600)で電気抵抗の値を測定し、その測定値を初期表面抵抗値とした。次に、60℃95%RH環境下にて1000時間放置後の表面抵抗値を上記と同様の方法にて測定し、負荷後表面抵抗値とした。そして、下記式:
変化率=負荷後表面抵抗値/初期表面抵抗値
に基づいて変化率を算出した。得られた結果を、表1に示す。
上記実施例1〜3及び比較例1で得られた透明導電体A〜Dを50mm角に切り取り、その切片を光透過吸収測定装置(島津製作所社製UV−3101PC、MPC−3100)を用いて波長550nmにおける切片の透過率を測定した。得られた結果を、表1に示す。
Claims (3)
- 導電性粒子及びバインダーを含む混合液を基体上に塗布する塗布工程と、
前記混合液を硬化させ導電層を形成する硬化工程と、
を備える透明導電体の製造方法において、
前記混合液における前記導電性粒子のゼータ電位の絶対値が70以下であり、
前記バインダーが水溶性モノマー又は乳化作用を有するモノマーを少なくとも含むモノマーから重合されたものであり、
前記導電性粒子が、水酸基を有する導電粉の表面を表面処理剤で処理したものであり、且つ
前記表面処理剤が、ビニル基、フッ化炭素基、アルキル基及びアリール基からなる群より選ばれる少なくとも1種の基を分子内に有する、透明導電体の製造方法。 - 前記表面処理剤の含有量は、前記導電性粒子100質量部に対して、0.01質量部〜5質量部である、請求項1記載の透明導電体の製造方法。
- 前記混合液中の前記導電性粒子を前記基体側に沈降させる沈降工程を更に含む、請求項1又は2記載の透明導電体の製造方法。
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US8002935B2 (en) | 2005-03-04 | 2011-08-23 | Insight Equity A.P.X., L.P. | Forming method for polymeric laminated wafers comprising different film materials |
| US8188173B2 (en) | 2008-01-16 | 2012-05-29 | Kuraray Co., Ltd. | Polyvinyl acetal powder coating material |
| US8298671B2 (en) | 2003-09-09 | 2012-10-30 | Insight Equity, A.P.X, LP | Photochromic polyurethane laminate |
| US8367211B2 (en) | 2003-09-09 | 2013-02-05 | Insight Equity A.P.X, L.P. | Photochromic lens |
| US11427754B2 (en) | 2013-01-09 | 2022-08-30 | Hoya Optical Labs Of America, Inc. | Photochromic polyurethane laminate |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5207728B2 (ja) * | 2006-12-21 | 2013-06-12 | 富士フイルム株式会社 | 導電膜およびその製造方法 |
| JP5516077B2 (ja) * | 2009-09-30 | 2014-06-11 | 大日本印刷株式会社 | タッチパネル用電極フィルム及びタッチパネル |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8298671B2 (en) | 2003-09-09 | 2012-10-30 | Insight Equity, A.P.X, LP | Photochromic polyurethane laminate |
| US8367211B2 (en) | 2003-09-09 | 2013-02-05 | Insight Equity A.P.X, L.P. | Photochromic lens |
| US8002935B2 (en) | 2005-03-04 | 2011-08-23 | Insight Equity A.P.X., L.P. | Forming method for polymeric laminated wafers comprising different film materials |
| US8440044B2 (en) | 2005-03-04 | 2013-05-14 | Insight Equity A.P.X., L.P. | Forming method for polymeric laminated wafers comprising different film materials |
| US8188173B2 (en) | 2008-01-16 | 2012-05-29 | Kuraray Co., Ltd. | Polyvinyl acetal powder coating material |
| US11427754B2 (en) | 2013-01-09 | 2022-08-30 | Hoya Optical Labs Of America, Inc. | Photochromic polyurethane laminate |
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