JP2023181965A - 多層シート及び多層電子装置 - Google Patents
多層シート及び多層電子装置 Download PDFInfo
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- JP2023181965A JP2023181965A JP2022201565A JP2022201565A JP2023181965A JP 2023181965 A JP2023181965 A JP 2023181965A JP 2022201565 A JP2022201565 A JP 2022201565A JP 2022201565 A JP2022201565 A JP 2022201565A JP 2023181965 A JP2023181965 A JP 2023181965A
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Abstract
Description
透明フィルム20は、多層シートの支持体であって、コーティング層及び接着層のベース層として活用可能である。
コーティング層10は、前記透明フィルム20の一面上に配置される。
弾性フィルム42は、広い温度範囲で安定した弾性特性を有するものを適用することが良い。
接着層30は、前記透明フィルム20の他面下に配置され得る。
多層シート100は、ベンディングとフォールディングが繰り返して発生する環境で安定的に内部装置を保護するために適用され得る。そのため、ベンディング耐久性と共に、外部から加えられる衝撃を吸収し、露出された表面がスクラッチ、打痕などに対して強い特性を有する多層シートが要求される。
図3は、他の具現例に係る多層電子装置の構造を断面で説明する概念図である。図3を参照して多層電子装置200を具体的に説明する。
シリコン接着剤として信越(Shinetsu)社のKR-3700;シリコンMQ樹脂として信越社のX-92-128、そして、触媒として白金系触媒である信越社のCAT-PL-50T、溶媒としてトルエンを用意した。接着層用組成物は、下記表1に提示された含量で混合した後に適用された。
硬化後の厚さが下記表1に提示された厚さになるように、PETフィルム(SKC社製のNRF等級)上にダイコーティングした後、乾燥させて前駆体層を得た。乾燥及び硬化は、90℃の温度で5分間行われた。
SKC社で製造したNRF(Novel Retardation Film)級のPETフィルムをそれぞれ厚さ別に入手し、透明フィルムとして適用した。
(1)光学的特性及び色相
光学的特性及び色相を測定した。ヘイズメーター(NDH-5000W、日本電色(Nippon Denshoku)社)を用いて、フィルムサンプルの可視光平均透過率をISO 13468標準に準拠して測定し、ヘイズをISO 14782標準に準拠して測定した。サンプルの黄色度(YI)は、分光光度計(UltraScan PRO、Hunter Associates Laboratory)によって、D65光源を用いて10°の条件でASTM-E313標準に準拠して測定した。その結果を下記表4に示した。
各層の厚さは、それぞれ、フィルメトリクス(Filmetrics)社のF-20装備を活用して、製造社のマニュアルに従って厚さを測定した。サンプル内の3点~5点で測定した結果を確認し、その平均値を厚さとして取り扱った。
多層シートの実施例は、35μmの厚さの弾性フィルム(SKC社製、アルケマフランス社のPEBA 72R Gradeの樹脂を適用して製造した単層押出フィルム)に接着させた後、動的曲げ評価(Dynamic folding test)を行った。2mmの曲率半径及び2秒/回の曲げの程度で常温(約20℃)で20万回の動的曲げ試験後にクラックの発生の有無を確認した。クラックの発生の有無は目視で観察した。実施例のサンプルの多層シートは、全て目視でクラックの発生が確認されず、良好と評価された。
製造されたサンプルに対してナノインデンテーション試験を行った。多層シートのサンプルをA4サイズに裁断し、別途の前処理なしに、試験前まで25±5℃及び50±5%RHで保管した。その後、サンプルに対してナノインデンテーション表面分析器(FISCHERSCOPE HM2000、FISCHER社)を用いて評価した。具体的には、サンプルホルダーとして厚さ約3TのGLASS TEST PLATE(Fischerscope Part no.600-028)上に、サンプルをコーティング層の表面(又はコーティング層がない場合に透明フィルムの表面)が上に来るように(即ち、押し込み面になるように)位置させた。その後、ダイヤモンドチップを用いて、常温で30mNの力で5秒間下方に押し付けた後、5秒間保持(creep)し、再び上方に上昇させながらナノインデンテーション試験を行って、マルテンス硬度(HM)、インデンテーションモジュラス(EIT)、弾性率(ηIT)、インデンテーションクリープ(CIT)、30mNの力での最大変形(hmax(@30mN))、及び復元率(Recovery)を測定した。測定は、ISO 14577-1:2015及び14577-2:2015に準拠して行われた。また、復元率(Recovery)は、下記式によって算出された。
10 コーティング層
20 透明フィルム
30 接着層
42 弾性フィルム
150 発光機能層
200 多層電子装置
t1 コーティング層の表面の測定点
Claims (10)
- ISO 13468に準拠した全光線透過率が85%以上である透明フィルムと、
前記透明フィルムの一面上に配置されたコーティング層と、
前記透明フィルムの他面下に配置された弾性フィルムと、を含む多層シートであって、
前記多層シートは、前記コーティング層の表面で測定したマルテンス硬度HMが180N/mm2以上である、多層シート。 - 前記多層シートは、前記コーティング層の表面で測定した弾性率ηITが62%以上である、請求項1に記載の多層シート。
- 前記弾性フィルムの厚さを基準として前記透明フィルムの厚さが0.5~3の厚さ比率を有する、請求項1に記載の多層シート。
- 変形-復元指数TR indexは、下記式1による値であり、
前記コーティング層の表面で測定した前記TR index(単位:/μm)は0.8以上2以下である、請求項1に記載の多層シート。
前記式1において、
HMdは、前記コーティング層の表面で測定した前記多層シートの単位厚さ(1μm)当たりのマルテンス硬度値(N/(mm2*μm))であり、
CITdは、前記コーティング層の表面で測定した前記多層シートの単位厚さ(1μm)当たりのインデンテーションクリープ値(%/μm)であり、
Rcdは、前記コーティング層の表面で測定した前記多層シートの単位厚さ(1μm)当たりの復元率値(%/μm)であり、
HITは、前記コーティング層の表面で測定した前記多層シートのインデンテーション硬度(N/mm2)である。 - 透明フィルムと、
前記透明フィルムの一面上に配置されたコーティング層と、
前記透明フィルムの他面下に配置された接着層と、
前記接着層の下に配置された弾性フィルムと、を含む多層シートであって、
前記多層シートは、前記コーティング層の表面で測定したマルテンス硬度HMが180N/mm2以上である、多層シート。 - 前記コーティング層の表面で測定した前記多層シートの単位厚さ(1μm)当たりのインデンテーションクリープ値は0.02%/μm~0.05%/μmである、請求項5に記載の多層シート。
- 前記コーティング層の表面で測定した前記多層シートの単位厚さ(1μm)当たりの復元率は0.4%/μm~1.2%/μmである、請求項5に記載の多層シート。
- 前記弾性フィルムと前記接着層との厚さの比率は1:0.02~1である、請求項5に記載の多層シート。
- 前記多層シートは、復元率が66%以上である、請求項5に記載の多層シート。
- 請求項1又は5に記載の多層シートと、
前記多層シートの下部に配置された発光機能層とを含む、多層電子装置。
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