JP5522759B2 - 導電性積層フィルム、タッチパネル用電極板、タッチパネルおよび導電性積層フィルム用粘着剤 - Google Patents
導電性積層フィルム、タッチパネル用電極板、タッチパネルおよび導電性積層フィルム用粘着剤 Download PDFInfo
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- JP5522759B2 JP5522759B2 JP2013012359A JP2013012359A JP5522759B2 JP 5522759 B2 JP5522759 B2 JP 5522759B2 JP 2013012359 A JP2013012359 A JP 2013012359A JP 2013012359 A JP2013012359 A JP 2013012359A JP 5522759 B2 JP5522759 B2 JP 5522759B2
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- laminated film
- acrylate
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Description
第一透明基材と第二透明基材は、いずれもプラスチック基材であり、
粘着剤層は、メチル(メタ)アクリレート1〜35重量%、炭素数が2〜12のアルキル基を有するアルキル(メタ)アクリレート60〜98重量%および官能基含有モノマー0.1〜10重量%をモノマー単位として含有するアクリル系ポリマーを含有する粘着剤により形成されていることを特徴とする導電性積層フィルム、に関する。
(アクリル系ポリマーの調製)
冷却管、窒素導入管、温度計および撹拌機を備えた反応容器に、メチルアクリレート5部、n‐ブチルアクリレート93部、アクリル酸2部、および2,2´−アゾビスイソブチロニトリル0.1部を酢酸エチルに加え、固形分濃度30重量%に調整し、さらに窒素置換を行った後、55℃に昇温し15時間重合反応を行なって、重量平均分子量180万のアクリル系ポリマーの溶液を得た。
上記アクリル系ポリマーの固形分100部に対して、架橋剤として、トリメチロールプロパントリレンジイソシアネート0.1部と、シランカップリング剤として、3−グリシドキシプロピルトリメトキシシラン0.1部を添加し、これらを均一に混合して、本発明のアクリル系粘着剤を得た。
第一透明基材として、厚さ125μm、幅1000mmのポリエチレンテレフタレートフィルム(帝人デュポン社製,品番F17)を準備し、その片面にアクリルウレタン系樹脂(大日本インキ化学工業社製の商品名「ユニディックU4005」)100部に、光重合開始剤としてヒドロキシシクロヘキシルフェニルケトン(チバスペシャルティケミカルズ社製の商品名「イルガキュア184」)5部を加えて、50重量%の濃度に希釈したトルエン溶液を塗布し、100℃で3分乾燥後、直ちにオゾンタイプ高圧水銀灯(80W/cm,15cm集光型)2灯で紫外線照射を行い、厚さ5μmのハードコート層を設けてハードコートフィルムを作成した。
上記粘着剤をハードコートフィルムの第二面(ハードコート層のない面)に塗布し、150℃で5分間乾燥して、厚さ23μmの粘着剤層を形成し、さらにこの上に、導電性フィルムの第二面(透明導電性薄膜を設けなかった面)を貼り合わせて、導電性積層フィルムを作成した。
実施例1において、メチルアクリレート、n‐ブチルアクリレートおよびアクリル酸の割合を、表1に示すように変えたこと以外は、実施例1と同様にして、アクリル系ポリマーを調製した。また当該アクリル系ポリマーを用いて、実施例1と同様にして、アクリル系粘着剤を得た。また、実施例1と同様にして導電性積層フィルムを作成した。
上記各例で得られた導電性積層フィルム(サンプル)について、下記評価を行った。結果を表1に示す。
各サンプルを、150℃で1時間または160℃で1時間の条件で、加熱オーブンにて加熱した後、恒温高湿槽(60℃,95%RH雰囲気下)で240時間晒した。その後、サンプルを取り出し、透過型顕微鏡200倍にて観察し、以下の基準で評価した。
○:オリゴマーを確認できない。
×:オリゴマーを確認できる。
各サンプルを、150℃で1時間、加熱オーブンにて加熱した。その後、サンプルを取り出し、透過型顕微鏡200倍にて観察し、以下の基準で評価した。
○:球状気泡を確認できない。
×:球状気泡を確認できる。
2 第二透明基材
3 透明導電性薄膜
4 粘着剤層
5 ハードコート層
Claims (9)
- 第一面と第二面を有する第一透明基材と、第一面と第二面を有する第二透明基材の第一面に透明導電性薄膜を有する導電性フィルムとを、第一透明基材の第二面と第二透明基材の第二面とが対向するように配置し、粘着剤層を介して接着した導電性積層フィルムであって、
第一透明基材と第二透明基材は、いずれもポリエステル系樹脂により形成されているプラスチック基材であり、
粘着剤層は、メチル(メタ)アクリレート1〜35重量%、炭素数が2〜12のアルキル基を有するアルキル(メタ)アクリレート60〜98重量%および官能基含有モノマー0.1〜10重量%をモノマー単位として含有するアクリル系ポリマーを含有する粘着剤により形成されていることを特徴とする導電性積層フィルム。 - 官能基含有モノマーが、カルボキシル基含有モノマーであることを特徴とする請求項1記載の導電性積層フィルム。
- メチル(メタ)アクリレートが、メチルアクリレートであることを特徴とする請求項1または2記載の導電性積層フィルム。
- 粘着剤は、架橋剤を含有することを特徴とする請求項1〜3のいずれかに記載の導電性積層フィルム。
- 粘着剤は、シランカップリング剤を含有することを特徴とする請求項1〜4のいずれかに記載の導電性積層フィルム。
- 第一透明基材の第一面にハードコート層を有することを特徴とする請求項1〜5のいずれかに記載の導電性積層フィルム。
- 請求項1〜6のいずれかに記載の導電性積層フィルムを用いたタッチパネル用電極板。
- 透明導電性薄膜を有する一対のタッチパネル用電極板を、透明導電性薄膜同士が対向するようにスペーサを介して対向配置してなるタッチパネルにおいて、タッチパネル用電極板の少なくとも一方が、請求項7記載のタッチパネル用電極板であることを特徴とするタッチパネル。
- 請求項1記載の導電性積層フィルムの粘着剤層の形成に用いられる、メチル(メタ)アクリレート1〜35重量%、炭素数が2〜12のアルキル基を有するアルキル(メタ)アクリレート60〜98重量%および官能基含有モノマー0.1〜10重量%をモノマー単位として含有するアクリル系ポリマーを含有する粘着剤からなることを特徴とする導電性積層フィルム用粘着剤。
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