JP2012025158A - 透明面状体及び透明タッチパネル - Google Patents
透明面状体及び透明タッチパネル Download PDFInfo
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Abstract
【解決手段】透明基板12の一方面側にパターニングされた透明導電膜11を有する透明面状体1であって、透明基板12の他方面側に偏光板13を備えており、透明基板12は、ノルボルネンとエチレンとの共重合比率が80:20〜90:10、MVR(メルトボリュームレート)が0.8〜2.0cm3/10分である環状オレフィンの付加(共)重合体よりなるリタデーション100nm〜150nmの位相差フィルムである透明面状体1。
【選択図】図1
Description
0 3が入れられている。上側電極フィルム110は位相差フィルム111とITO電極112とからなる。下側電極基板120はガラス基板121とITO電極1 2 2とからなる。位相差フィルム111と偏光板101は粘着層1
0 2で貼り合わされている。ガラス基板121と位相差フィルム105は、粘着層104で貼り合わされている。
21-ADHで測定可能である。ノルボルネンとエチレンとの共重合体フィルムの延伸によって、リタデーションは制御されるが、その延伸手法に特に限定はない。外部応力が強いほど複屈折が大きくなり、リタデーションも大きくなる。
Re=△nd=|nx−ny|×d ・・・式(1)
10分である、ガラス転移温度が170〜200℃の環状オレフィンの付加(共)重合体を使用し、例えば180℃以上で延伸加工を行うことによって得られる。
1 0分よりも大きい場合には、得られる位相差フィルムの強度が弱すぎてタッチパネル等に必要な加工(スパッタリング等)工程に耐えることができない。
Nz=(nx−nz)/|nx−ny| ・・・式(2)
得られた位相差フィルムの160℃で30分での寸法変化率はMD=−0.46%、TD=0.22%であった。得られた位相差フィルムの強度は十分使用できるものであった。
また、上記で得られたフィルムの片面に、フィルム温度を90℃に保った状態で、抵抗値450Ω/□のITO透明導電膜をスパッタリング法により形成した。さらに165℃温度で1時間熱処理を行うことによって抵抗値240Ω/□のITO透明導電膜を形成した。得られたITO膜(実施例2)の結晶化度の測定結果を図7に示す。
5 0℃に保った状態で抵抗値236Ω/□のITO透明導電膜をスパッタリング法により形成した。得られたITO膜(実施例3)の結晶化度の測定結果を図8に示す。
[実施例1]
本サンプルは、図11に示す構造を有しており、アンダーコート層14を構成する低屈折率層14aと高屈折率層14bとは、それぞれ、スパッタで成膜したSiO2薄膜(屈折率:1.46)と、酸化ジルコニウム微粒子を含有するハードコート剤(東洋インキ製造株式会社製リオデュラス)をコーティングして成膜した高屈折率ハードコート層(屈折率:1.65)と、により形成した。また、パターニングされた透明導電膜は、スパッタで成膜したITO膜をエッチングして形成した。低屈折率層14a(SiO2薄膜)の厚みを7.5nmとし、高屈折率層14b(高屈折率ハードコート層)の厚みを5μmとし、透明導電膜(ITO膜)の厚みを20nmとした。また、粘着層3の厚みは、25μmであり、粘着層3の屈折率は、1.47である。また、透明基板12は、ノルボルネンとエチレンとの共重合比率が、82:18であり、ガラス転移温度180℃、MVR=1.5の共重合体を溶融押出法にて樹脂温度300℃、引取りロール温度130℃で、厚みが100μmになるようにフィルムを作成し、次いでロール周速が7.0m/minと、ロール周速が14.0m/minの2本の異なる周遠の金属ロール間を、フィルム温度を190℃に保った状態で走行させることにより、延伸倍率2.0倍、リタデーション138nm、Nz係数=1.0、フィルム厚み86μmの位相差フィルムにより形成している。得られた位相差フィルムの160℃で30分での寸法変化率はMD=−0.46%、TD=0.22%である。なお、この位相差フィルム(透明基板12)の屈折率は、1.53である。また、透明基板12の他方面(透明導電膜11が形成されていない側の面)には、アクリル系UV硬化樹脂からなるハードコート層6が配置されている。このハードコート層の厚みは、5μmである。
四探針プローブにて測定した。
上記サンプルの比較例として、図11に示す透明面状体の構成において、透明基板をゼオノアフィルム[日本ゼオン(株)製 ZMシリーズ]に変更した比較サンプルを作成した。なお、透明導電膜11(ITO膜)は、温度120℃下でスパッタリング法で成膜した後、温度120℃下にて30分の熱処理(アニール処理)を行った。透過光を照射した場合に、透明導電膜11のパターン形状が目立たないか否かの官能試験も行ったが、比較例1においては、透明導電膜11のパターン形状が確認され、視認性が悪いという結果であった(表3参照)。これは、ITO膜の結晶化が不十分のため、ITO膜が黄色味の強い色目になることで、パターンが視認されたと考えられる。
1 第1透明面状体
2 第2透明面状体
11,21 透明導電膜
12,22 透明基板
13 偏光板
14,24 アンダーコート層
14a,24a 低屈折率層
14b,24b 高屈折率層
3 粘着層
Claims (5)
- 透明基板の一方面側にパターニングされた透明導電膜を有する透明面状体であって、
前記透明基板の他方面側に偏光板を備えており、
前記透明基板は、ノルボルネンとエチレンとの共重合比率が80:20〜90:10、MVR(メルトボリュームレート)が0.8〜2.0cm3/10分である環状オレフィンの付加(共)重合体よりなるリタデーション100nm〜150nmの位相差フィルムである透明面状体。 - 前記透明基板は、160℃で30分の熱処理による収縮率がMD(流れ方向)、TD(垂直方向)ともに、0.5%以下である請求項1に記載の透明面状体。
- 前記透明基板と前記透明導電膜との間にアンダーコート層が介在されており、
前記アンダーコート層は、光屈折率が異なる2以上の層の積層体から構成され、低屈折率層側に前記透明導電膜が形成されている請求項1又は2に記載の透明面状体。 - 前記低屈折率層は、酸化珪素により形成されており、
前記高屈折率層は、光屈折率2.0〜2.8の金属酸化物粒子を含む樹脂素材により形成されている請求項3に記載の透明面状体。 - 請求項1から4のいずれかに記載の透明面状体を少なくとも1つ備える透明タッチパネルであって、前記透明面状体の透明導電膜と、該透明導電膜とは異なる第2の透明導電膜とが、互いに対向する向き、或いは、同一方向となる向きに配置されている透明タッチパネル。
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