JP6075445B2 - 導電性積層体及びこれを含むタッチパネル - Google Patents
導電性積層体及びこれを含むタッチパネル Download PDFInfo
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- JP6075445B2 JP6075445B2 JP2015512589A JP2015512589A JP6075445B2 JP 6075445 B2 JP6075445 B2 JP 6075445B2 JP 2015512589 A JP2015512589 A JP 2015512589A JP 2015512589 A JP2015512589 A JP 2015512589A JP 6075445 B2 JP6075445 B2 JP 6075445B2
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Images
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Landscapes
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Description
ハードコーティング層が形成されたPET(poly(ethylene terephthalate))フィルム(厚さ:100μm)のハードコーティング層とPC(polycarbonate)フィルム(厚さ:1mm)を実施例または比較例の粘着剤層にラミネートし、横50mm、縦100mmのサイズで切断した後に、60℃及び5気圧の条件で、30分間オートクレーブ処理して試片を製造した後、前記製造された試片を80℃で約240時間放置して耐久性を評価する。
O:光学顕微鏡により粘着界面で気泡が観察されないか、直径が100以下の気泡が少量観察される場合
×:光学顕微鏡により粘着界面で直径が100以上の気泡、または群集されている多量の直径が100以下の気泡が観察される場合
O:粘着界面で浮き上り及び剥離の発生がない場合
×:粘着界面で浮き上り及び/または剥離が発生した場合
抵抗変化率は、図4に示したような測定構造で測定する。通常的に、入手可能な導電性フィルムで一面にITO(Indium Tin Oxide)導電性層202が形成されたPETフィルム201(導電性PET)を、幅が30mmであり、長さが50mmになるように切断する。次いで、図4のように、両端に幅が10mmがなるように銀ペースト(Silver Paste)502を塗布し、150℃で30分間焼成する。前記焼成されたフィルムに、実施例または比較例で製造された両面に離型フィルム102が付着された両面粘着テープを、幅が30mmであり、長さが40mmになるように切断し、一面の離型フィルムを剥離し、粘着剤層101の中心をPETフィルム201の中心と合わせて導電性層202に付着する。その後、抵抗測定器501で導電性層202の初期抵抗Riを測定する。初期抵抗測定後、図4の測定構造の試片を60℃及び90%の相対湿度で240時間の間維持した後、同じ測定器501で導電性層202の抵抗Raを測定し、測定された数値を下記式1に代入し、抵抗変化率Rを測定した。
実施例または比較例の粘着テープを1インチの幅で切断した後、PC(polycarbonate)フィルムに2Kgのローラーを2回往復させて付着する。付着後、約30分が経過した時点で、常温で、引張試験機(Texture Analyzer)で、180度の剥離角度及び300mm/minの剥離速度で粘着テープを幅方向に剥離しながら剥離力を測定する。一つの粘着テープに対して同一な方式で3回剥離力を測定し、その平均値を代表値として使用する。
分子量(Mw)は、GPC(Gel Permeation Chromatograph)装備を使用して、下記の条件で測定する。検量線の作成には、Agilent systemの標準ポリスチレンを使用して、測定結果を換算する。
測定器:Agilent GPC(Agilent 1200series、米国)
カラム:PL Mixed B 2個連結
カラム温度:40℃
溶離液:THF(Tetrahydrofuran)
流速:1.0mL/min
濃度:〜2mg/mL(100μL injection)
窒素ガスが還流され、温度調節が容易となるように冷却装置を設置した反応器に、n−ブチルアクリレート58重量部、メチルアクリレート40重量部及び2−ヒドロキシエチルアクリレート2重量部を投入し、溶剤として、単量体100重量部に対し200重量部のエチルアセテートを投入した。前記反応器を窒素ガスで約60分程度パージング(purging)し、温度を約60で維持した状態で、反応開始剤であるアゾビスイソブチロニトリル(AIBN)を、単量体100重量部に対し0.04重量部で投入して、反応を開始した。約8時間の間反応を進行した後、固形分濃度が約30重量%になるようにエチルアセテートで反応物を希釈し、分子量(Mw)が約80万であり、多分散指数(Mw/Mn)が約5.2であるアクリル重合体溶液(A)を製造した。
製造例1で使用した同一な反応器に、n−ブチルアクリレート58重量部、メチルアクリレート40重量部及び2−ヒドロキシエチルアクリレート2重量部を投入し、溶剤として、単量体100重量部に対し100重量部のエチルアセテートを投入した。前記反応器を窒素ガスで約60分程度パージング(purging)し、温度を約60で維持した状態で、N−ドデカンチオール(N−dodecane thiol)を、単量体100重量部に対し5重量部の割合で投入し、反応開始剤であるアゾビスイソブチロニトリル(AIBN)を、単量体100重量部に対し0.04重量部で投入して、反応を開始した。約8時間の間反応を進行した後、固形分濃度が約30重量%になるようにエチルアセテートで反応物を希釈し、分子量(Mw)が約6,000であり、多分散指数(Mw/Mn)が約1.8である低分子量重合体溶液(B)を製造した。
製造例1で使用した同一な反応器に、n−ブチルアクリレート58重量部、メチルアクリレート40重量部及び2−ヒドロキシエチルアクリレート2重量部を投入し、溶剤として、単量体100重量部に対し150重量部のエチルアセテートを投入した。前記反応器を窒素ガスで約60分程度パージング(purging)し、温度を約60で維持した状態で、N−ドデカンチオール(N−dodecane thiol)を、単量体100重量部に対し0.03重量部の割合で投入し、反応開始剤であるアゾビスイソブチロニトリル(AIBN)を、単量体100重量部に対し0.04重量部で投入して、反応を開始した。約8時間の間反応を進行した後、固形分濃度が約30重量%になるようにエチルアセテートで反応物を希釈し、分子量(Mw)が約78万であり、多分散指数(Mw/Mn)が約2.8である重合体溶液(C)を製造した。
製造例1のアクリル重合体溶液(A)、製造例2のアクリル低分子量重合体溶液(B)及びイソシアネート架橋剤(TDI)を配合して粘着剤組成物を製造した。重合体溶液(B)は、溶液(A)の固形分100重量部に対し溶液(B)の固形分が0.5重量部になるように配合し、架橋剤は、溶液(A)の固形分100重量部に対し0.3重量部の割合で配合した。一面に離型処理されているPET(poly(ethylene terephthalate))フィルム(厚さ:約50μm)の離型処理された面に前記粘着剤組成物を塗布し、約120℃で約3分間維持し、厚さが約50μmである透明な粘着剤層を形成した。その後、粘着剤層上に他の離型処理されたPETフィルム(厚さ:約50μm)の離型処理面をラミネートし、図1の構造の粘着テープを製造した。
前記粘着剤組成物の製造時に配合される成分及びその割合を下記表1のように調節したこと以外は、実施例1と同一な方式で粘着テープを製造した。
102 離型フィルム
200、300、400 導電性積層体
201、403 基材層
202、402 導電性層
301 基板
502 銀ペースト
501 抵抗測定器
Claims (14)
- 基材層と、
前記基材層の一面または両面に形成されている粘着剤層と、
前記基材層と前記粘着剤層との間に存在する導電性層と、を含み、
前記粘着剤層は、粘着性重合体100重量部;及び重量平均分子量が1,000〜20万であり、チオール化合物を含む単量体混合物の重合体0.1重量部〜35重量部を含む粘着剤組成物から形成され、
前記粘着性重合体は、(メタ)アクリル酸エステル単量体80重量部〜99.99重量部及び架橋性官能基を有する共重合性単量体0.01重量部〜20重量部を含み、
前記架橋性官能基は、ヒドロキシ基、イソシアネート基、グリシジル基またはこれらの誘導体であることを特徴とする導電性積層体。 - 前記基材層と前記粘着剤層との間に存在するメタルメッシュ層をさらに含むことを特徴とする請求項1に記載の導電性積層体。
- 前記メタルメッシュ層は、銀、銅またはこれらの合金を含むことを特徴とする請求項2に記載の導電性積層体。
- 前記粘着剤層に付着されている透明基板をさらに含むことを特徴とする請求項1に記載の導電性積層体。
- 前記導電性層は、抵抗変化率が10%以下であることを特徴とする請求項1に記載の導電性積層体。
- 前記粘着剤層がポリカーボネートフィルム上に形成される場合に、前記ポリカーボネートフィルムに対して前記粘着剤層の剥離力が、常温で1,900gf/25mm以上であることを特徴とする請求項1に記載の導電性積層体。
- 前記粘着性重合体は、重量平均分子量が30万〜200万であることを特徴とする請求項1に記載の導電性積層体。
- 前記チオール化合物は、前記化学式1で、Rが、炭素数1〜20のアルキル基、ヒドロキシ基に置換されている炭素数1〜20のアルキル基またはオキシラニル基に置換されている炭素数1〜20のアルキル基の化合物であることを特徴とする請求項8に記載の導電性積層体。
- 前記単量体混合物は、単量体100重量部に対し0.01重量部〜10重量部の前記チオール化合物を含むことを特徴とする請求項1に記載の導電性積層体。
- 前記単量体混合物は、(メタ)アクリル酸エステル単量体を含むことを特徴とする請求項1に記載の導電性積層体。
- 前記単量体混合物は、架橋性官能基を有する共重合性単量体を含むことを特徴とする請求項1に記載の導電性積層体。
- 多官能性架橋剤を前記粘着性重合体100重量部に対し0.01重量部〜10重量部でさらに含むことを特徴とする請求項1に記載の導電性積層体。
- 請求項1〜請求項13の中でいずれか1項に記載の導電性積層体を含むことを特徴とするタッチパネル。
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