JP2019002007A - 熱剥離型接着部材及びそれを含む表示装置 - Google Patents
熱剥離型接着部材及びそれを含む表示装置 Download PDFInfo
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- JP2019002007A JP2019002007A JP2018112142A JP2018112142A JP2019002007A JP 2019002007 A JP2019002007 A JP 2019002007A JP 2018112142 A JP2018112142 A JP 2018112142A JP 2018112142 A JP2018112142 A JP 2018112142A JP 2019002007 A JP2019002007 A JP 2019002007A
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- RMVWMBYSLPCLJA-GRQBKTHUSA-N C(C1)[C@H]2C1C1=CC1C2 Chemical compound C(C1)[C@H]2C1C1=CC1C2 RMVWMBYSLPCLJA-GRQBKTHUSA-N 0.000 description 1
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Abstract
Description
また、一実施例の熱剥離型接着部材APのヘイズ値は0.1%以下である。この際、ヘイズ値は、ヘイズメータ(haze meter)を利用して測定されたものである。一実施例の熱剥離型接着部材APは、ナノスケールの粒子のサイズを有する微細カプセルMCを含んで90%以上の高い透過度と0.1%以下の低いヘイズ値を有するので、光学的透明性が要求される接着部材として十分使用可能である。
[実施例]
本発明の一実施例の熱剥離型接着部材に含まれた微細カプセルの製造方法について例示し、具体的に説明する。また、以下で説明する微細カプセルの製造法は一実施例であって、本発明の実施形態による微細カプセルの製造法は下記実施例に限られない。例えば、一実施例の微細カプセルの製造過程は以下に提示された反応条件に限定されずに、該当技術分野で知られている反応条件であれば如何なる条件が適用されても構わない。
超純水(D.I water)30gにドデシル硫酸ナトリウム(sodium dodecyl sulfate:SDS)0.3gを添加した後、十分に撹拌して混合する。有機溶媒であるメチルシクロヘキサン(methylcyclohexane)2gにメチルメタクリレート(methylmethacrylate)0.5g、AIBN(azobisisobutyronitrile)0.0025gを添加した有機混合物を十分に撹拌する。次に、撹拌した有機混合物をドデシル硫酸ナトリウムが混合された超純水(D.I water)に入れ、40℃の温度で、且つ600rpmの回転速度で、30分間撹拌する。次に、超音波振動器(Sonifier)を利用して、氷水バス(icewater bath)で、70%振幅(amplitude)で3分間超音波処理を行う。次に、窒素パージング下で、コンデンサを取り付けたまま70℃の温度で、且つ600rpmの回転速度で、8時間反応させ、ナノカプセルを製造する。最後に、ジアリシスチューブ(dialysis tube)を利用して、合成されたナノカプセルを7日間精製する。製造されたナノカプセルは、50nm以上500nm以下の粒子サイズを有する。製造された微細カプセルは、PMMA(polymethylmethacrylate)からなる外皮部、及び外皮部に包まれた中空部内にメチルシクロヘキサンを含む。
超純水(D.I water)45gにドデシル硫酸ナトリウム(SDS)0.45gを添加した後、十分に撹拌して混合する。有機溶媒であるメチルシクロヘキサン3gにメチルメタクリレート0.75g、アクリロニトリル(acrylonitrile)0.675g、及びAIBN0.0038gを添加した有機混合物を十分に撹拌する。次に、撹拌した有機混合物をドデシル硫酸ナトリウムが混合された超純水(D.I water)に入れ、40℃の温度で、且つ600rpmの回転速度で、30分間撹拌する。次に、超音波振動器を利用して、氷水バスで、70%振幅で3分間超音波処理を行う。次に、窒素パージング下で、コンデンサを取り付けたまま70℃の温度で、且つ600rpmの回転速度で、8時間反応させ、ナノカプセルを製造する。最後に、ジアリシスチューブを利用して、合成されたナノカプセルを7日間精製する。製造されたナノカプセルは、50nm以上500nm以下の粒子サイズを有する。製造された微細カプセルは、PAN(polyacrylonitrile)とPMMAの共重合体からなる外皮部、及び外皮部に包まれた中空部内にメチルシクロヘキサンを含む。
ベース樹脂であるPMMA樹脂に製造された微細カプセルを追加し、30分間混合撹拌して、熱剥離型接着部材用接着レジンを製造した。この際、微細カプセルは、ベース樹脂と微細カプセルの全体重量を基準に各々、1.0wt%、又は5.0wt%が含まれるサンプルを製造した。
下記表1は、各実施例の外皮部と有機溶媒の構成及びベース樹脂に対する微細カプセルの含量を示す。表1において、微細カプセルの含量は、ベース樹脂と微細カプセルの全体含量を基準とした重量比率を示す。
実施例及び比較例に対し、紫外−可視光スペクトロメータ(UV−vis spectrometer)を利用して光透過度を測定した。表2は、比較例と実施例に対する600nmにおける光透過度の相対値を示すものである。また、図13及び図14は、比較例と実施例における光透過度評価の結果を示す図である。表2に開示した光透過度値は、600nmの波長における比較例の光透過度を100%にする際の相対的な光透過度を示すものである。
比較例と実施例に対する初期接着強度及び熱処理後の接着強度を評価した。比較例は微細カプセルを含まないOCA接着層であり、実施例は前記表1の構成を有するものである。
表3は、比較例と実施例に対する初期接着強度と熱処理以降の接着強度の相対的な値を示すものである。
AP、AP−a、AP−b、AP−c、AP−1 熱剥離型接着部材
BR ベースレジン、ベース樹脂
DD、DD−1 表示装置
DP 表示パネル
IH 中空部
MC 微細カプセル
OS 外皮部
SB 有機溶媒
TSU 入力感知ユニット
WP ウィンドウ部材
Claims (10)
- ベース樹脂及び前記ベース樹脂に分散されて配置された微細カプセルを含み、
前記微細カプセルは、
疎水性高分子物質を含む外皮部と、
前記外皮部によって定義され、有機溶媒が収容されている中空部と、を含む、ことを特徴とする熱剥離型接着部材。 - 前記微細カプセルの粒子のサイズは、50nm以上500nm以下である、ことを特徴とする請求項1に記載の熱剥離型接着部材。
- 前記疎水性高分子物質は、ポリアクリロニトリルとポリメチルメタクリレートの共重合体を含む、ことを特徴とする請求項1に記載の熱剥離型接着部材。
- 前記有機溶媒の気化温度は、50℃以上150℃以下である、ことを特徴とする請求項1に記載の熱剥離型接着部材。
- 前記微細カプセルは常温で第1体積を有し、
前記気化温度以上で前記第1体積より大きい第2体積を有する、ことを特徴とする請求項4に記載の熱剥離型接着部材。 - 前記熱剥離型接着部材は、400nm以上800nm以下の波長領域における透過度が90%以上である、ことを特徴とする請求項1に記載の熱剥離型接着部材。
- 前記熱剥離型接着部材は、ヘイズ値が0.1%以下である、ことを特徴とする請求項1に記載の熱剥離型接着部材。
- 前記熱剥離型接着部材は、互いに向かい合う一面と他面を含む両面接着シートであり、
前記一面から前記他面に行くほど前記微細カプセルの分散密度が減少する、ことを特徴とする請求項1に記載の熱剥離型接着部材。 - 前記熱剥離型接着部材は、
前記微細カプセルが第1密度に分散された第1接着部と、
前記微細カプセルが第2密度に分散された第2接着部と、
前記第1接着部及び前記第2接着部の間に配置され、前記微細カプセルが第3密度に分散された第3接着部と、を含み、
前記第3密度は前記第1密度及び前記第2密度以下である、ことを特徴とする請求項1に記載の熱剥離型接着部材。 - 表示パネルと、
前記表示パネルの上に配置されたウィンドウ部材と、
前記表示パネルと前記ウィンドウ部材の間に配置された請求項1乃至請求項9のうち何れか一つの熱剥離型接着部材と、を含む、ことを特徴とする表示装置。
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