JP5506011B2 - 粘着剤層付き透明導電性フィルムおよびその製造方法 - Google Patents
粘着剤層付き透明導電性フィルムおよびその製造方法 Download PDFInfo
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- JP5506011B2 JP5506011B2 JP2008046254A JP2008046254A JP5506011B2 JP 5506011 B2 JP5506011 B2 JP 5506011B2 JP 2008046254 A JP2008046254 A JP 2008046254A JP 2008046254 A JP2008046254 A JP 2008046254A JP 5506011 B2 JP5506011 B2 JP 5506011B2
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Description
熱収縮率(%)=(L1−L2)/L1×100
透明プラスチックフィルム基材の一方の面にアモルファス透明導電性薄膜が設けられたアモルファス透明導電性積層体における前記透明プラスチックフィルム基材の他方の面に、
離型フィルムに設けた粘着剤層を貼り合わせる工程を有することを特徴とする粘着剤層付き透明導電性フィルムの製造方法、に関する。
透明プラスチックフィルム基材等の1μm以上の厚みを有するものに関しては、ミツトヨ製マイクロゲージ式厚み計にて測定を行った。粘着剤層等の直接厚みを計測することが困難な層の場合は、当該層を設けた基材を含めた総厚みを測定し、基材の厚みを差し引くことで当該層の膜厚を算出した。
JIS K-7105に基づいて全光線透過率を測定した。なお、本発明の粘着剤層付き透明導電性フィルムは、離型フィルムを含まない状態において、透明性の観点より、全光線透過率が80%以上であることが好ましく、85%以上であることがより好ましい。
三菱化学社製のローレスター抵抗測定器を用いて、表面抵抗値(Ω/□)を測定した。なお、本発明の粘着剤層付き透明導電性フィルムは、導電面である透明導電性薄膜における表面抵抗値が100〜1000Ω/□であることが好ましく、200〜700Ω/□であることがより好ましい。特にタッチパネルに用いる場合は消費電力の観点からあまり低抵抗でないことが好ましい。
(アンダーコート層の形成)
透明プラスチックフィルム基材として、厚さ25μmのポリエチレンテレフタレートフィルム(以下、PETフィルムという)の一方の面に、移行防止層(ウレタンアクリル系紫外線硬化性樹脂により形成,厚さ1μm)を設けてなるものを用いた。なお、用いたPETフィルムは、MD方向の熱収縮率が0.5%であった。当該フィルム基材の他方の面に、メラミン樹脂:アルキド樹脂:有機シラン縮合物の重量比2:2:1の熱硬化型樹脂により、厚さが180nmの第一層目のアンダーコート層を形成した。次いで、第一層目のアンダーコート層上に、SiO2を、電子ビーム加熱法により1.33×10-2〜2.67×10-2Paの真空度で真空蒸着して、厚さ40nmの第二層目のアンダーコート層(SiO2膜)を形成した。
次に、第二層目のアンダーコート層上に、アルゴンガス80%と酸素ガス20%とからなる5.33×10-2Paの雰囲気中で、酸化インジウム95重量%、酸化スズ5重量%を用いた反応性スパッタリング法により、厚さ20nmのITO膜を形成して、透明導電性積層体を得た。上記ITO膜は、アモルファスであった。なお、得られた透明導電性積層体の一部をサンプリングし、MD方向の熱収縮率を測定したところ、0.5%であった。また、透明導電性積層体の厚み(総厚み)は、26.24μmであった。
離型フィルムとして、厚さ75μmのPETフィルムの片面に、移行防止層(ウレタンアクリル系紫外線硬化性樹脂により形成,厚さ1μm)、次いで、シリコーン系剥離層(厚さ1μm)を設けてなるもの(総厚み:77μm)を用いた。なお、用いたPETフィルムは、MD方向の熱収縮率が0.4%であった。また、離型フィルムの曲げ弾性率は、3000MPaであった。また、離型フィルムの一部をサンプリングし、MD方向の熱収縮率を測定したところ、0.4%であった。そして、前記剥離層上に、厚さ25μm、弾性係数10N/cm2の透明なアクリル系の粘着剤層を形成した。粘着剤層組成物としては、アクリル酸ブチルとアクリル酸と酢酸ビニルとの重量比が100:2:5のアクリル系共重合体100重量部に、イソシアネート系架橋剤を1重量部配合してなるものを用いた。上記粘着剤層側に、上記透明導電性積層体の透明導電性薄膜を形成していない側の面を貼り合せて、粘着剤層付き透明導電性フィルムを作製した。この粘着剤層付き透明導電性フィルムは、140℃で1.5時間加熱した後のカールが4頂点平均で5mmであった。また透明導電性薄膜の表面抵抗値は、300Ω/□であった。さらに離型フィルムを剥離し、ガラス板に粘着剤層を介して貼り合わせた状態における全光線透過率を測定したところ、89.0%であった。
実施例2〜5として、透明プラスチックフィルム基材のPETフィルム、及び離型フィルムのPETフィルムを、表1に記載の熱収縮率を有するPETフィルムに変更したこと以外は、実施例1と同様に粘着剤層付き透明導電性フィルムを作製し、カールを測定した。結果を表1に示す。
比較例1〜3として、透明プラスチックフィルム基材のPETフィルム、及び離型フィルムのPETフィルムを、表1に記載の熱収縮率を有するPETフィルムに変更したこと以外は、実施例1と同様に粘着剤層付き透明導電性フィルムを作製し、カールを測定した。結果を表1に示す。
2 透明導電性薄膜(アモルファス透明導電性薄膜)
3 粘着剤層
4 離型フィルム
5 アンダーコート層
10 透明導電性積層体(アモルファス透明導電性積層体)
Claims (12)
- 透明プラスチックフィルム基材の一方の面にアモルファス透明導電性薄膜が設けられたアモルファス透明導電性積層体と、前記透明プラスチックフィルム基材の他方の面に粘着剤層を介して設けられた、少なくともフィルム基材を有する離型フィルムとを有し、
前記離型フィルムの厚みが、前記アモルファス透明導電性積層体の厚みより大きく、
前記透明プラスチックフィルム基材の厚みが、10〜40μmであり、
前記離型フィルムの厚みが、50〜100μmであり、
前記アモルファス透明導電性積層体のMD方向の熱収縮率から前記離型フィルムのMD方向の熱収縮率を引いた値が、−0.3〜0.45%であることを特徴とする粘着剤層付き透明導電性フィルム。 - アモルファス透明導電性薄膜は、少なくとも1層のアンダーコート層を介して、透明プラスチックフィルム基材の一方の面に設けられていることを特徴とする請求項1記載の粘着剤層付き透明導電性フィルム。
- アモルファス透明導電性薄膜は、酸化インジウム90〜99重量%および酸化スズ1〜10重量%を含有する金属酸化物により形成されていることを特徴とする請求項1または2記載の粘着剤層付き透明導電性フィルム。
- 離型フィルムの曲げ弾性率が、1500〜8000MPaであることを特徴とする請求項1〜3のいずれかに記載の粘着剤層付き透明導電性フィルム。
- 離型フィルムは、離型フィルムのフィルム基材が粘着剤層に配置される側に、剥離層および/またはオリゴマーの移行防止層を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粘着剤層付き透明導電性フィルム。
- 粘着剤層の厚みが、5〜50μmであることを特徴とする請求項1〜5のいずれかに記載の粘着剤層付き透明導電性フィルム。
- 粘着剤層が、アクリル系粘着剤層であることを特徴とする請求項1〜6のいずれかに記載の粘着剤層付き透明導電性フィルム。
- 離型フィルムのフィルム基材の材料と、透明プラスチックフィルム基材の材料が、同種材料であることを特徴とする請求項1〜7のいずれかに記載の粘着剤層付き透明導電性フィルム。
- 粘着剤層付き透明導電性フィルムは、140℃で1.5時間加熱した後のカールが25mm以下であることを特徴とする請求項1〜8のいずれかに記載の粘着剤層付き透明導電性フィルム。
- 粘着剤層は、離型フィルムを剥離した後に、他の基材に貼り合わせるものであることを特徴とする請求項1〜9のいずれかに記載の粘着剤層付き透明導電性フィルム。
- アモルファス透明導電性薄膜は、結晶化加工処理がなされた後において、粘着剤層から離型フィルムを剥離して、他の基材に貼り合わせるものであることを特徴とする請求項1〜10のいずれかに記載の粘着剤層付き透明導電性フィルム。
- 請求項1〜11のいずれかに記載の粘着剤層付き透明導電性フィルムの製造方法であって、
透明プラスチックフィルム基材の一方の面にアモルファス透明導電性薄膜が設けられたアモルファス透明導電性積層体における前記透明プラスチックフィルム基材の他方の面に、
離型フィルムに設けた粘着剤層を貼り合わせる工程を有することを特徴とする粘着剤層付き透明導電性フィルムの製造方法。
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