JP2006036810A - 光学部材用粘着剤組成物、光学部材用粘着剤層、光学部材用粘着シート類、粘着型光学部材、及び画像表示装置 - Google Patents
光学部材用粘着剤組成物、光学部材用粘着剤層、光学部材用粘着シート類、粘着型光学部材、及び画像表示装置 Download PDFInfo
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Abstract
【解決手段】モノマー単位として不飽和カルボン酸0.2〜2重量%含有する、エマルション重合により得られた(メタ)アクリル系ポリマー(A)100重量部、モノマー単位として不飽和カルボン酸1〜7重量%含有し、前記(メタ)アクリル系ポリマー(A)のカルボン酸当量より大きいカルボン酸当量を有し、重量平均分子量が2000〜50000の範囲にある(メタ)アクリル系ポリマー(B)0.1〜20重量部、及び、シランカップリング剤0.01〜1重量部含有してなることを特徴とする光学部材用粘着剤組成物。
【選択図】なし
Description
作製したポリマーの重量平均分子量は、GPC(ゲル・パーミエーション・クロマトグラフィー)により測定した。なお、(メタ)アクリル系ポリマー(A)については、分子量が大きく測定できなかったが、およそ300万以上であると推測される。
カラム:
サンプルカラム;東ソー社製、GMHHR−H+GMHHR−H+G2000HHR
カラムサイズ;各7.8mmφ×30cm(計90cm)
流量:0.8ml/min
注入量:100μl
カラム温度:40℃
溶離液:THF
注入試料濃度:0.1重量%
検出器:示差屈折計
なお、重量平均分子量はポリスチレン換算により算出した。
作製したそれぞれの評価用粘着剤付光学部材を幅25mmのサイズにカットし、無アルカリガラス板(コーニング社製、1737、厚さ:1mm)に圧着して接着力評価用サンプルとした(圧着条件:重さ2kgのローラー、速度5m/min、一往復処理)。
前記のオートクレーブ処理後の粘着剤付光学部材をさらに90℃にて300時間処理した後、次いで23℃×50%RHの環境下で3時間処理した後、万能引張試験機にて剥離角度90°で剥離(剥離速度:300mm/min)した際のステンレス板表面の汚染の状態を目視にて観察した。評価基準は以下のとおりである。
糊残りの発生が認められた場合:×
作製した粘着剤付光学部材を幅26cm×長さ20cmのサイズに裁断し、無アルカリガラス板(コーニング社製、1737、厚さ:0.7mm)にラミネーターにより圧着して評価用サンプルとした。
光学部材の剥がれや浮きが認められた場合:×
作製した粘着剤付光学部材を幅26cm×長さ20cmのサイズに裁断し、無アルカリガラス板(コーニング社製、1737、厚さ:0.7mm)の両面に偏光板の吸収軸が直行するようにラミネーターにより圧着して評価用サンプルとした。
色ムラの発生が認められた場合:×
(アクリル系ポリマー(A1)の調製)
ホモミキサーに、2−エチルヘキシルアクリレート80重量部、ブチルアクリレート20重量部、アクリル酸1重量部、3−アクリロキシプロピルトリエトキシシラン0.10重量部、反応性乳化剤としてアクアロンHS−20(第一工業製薬社製)2.0重量部、イオン交換水25重量部を仕込み、これらを乳化することによって乳化液を調製した。
攪拌羽根、温度計、窒素ガス導入管、冷却器を備えた4つ口フラスコに、ブチルアクリレート80重量部、2−エチルヘキシルアクリレート15重量部、アクリル酸5.0重量部、ラウリルメルカプタン0.80重量部、重合開始剤として2,2’−アゾビスイソブチロニトリル(和光純薬社製)0.10重量部を加えて、十分に窒素置換した後、窒素気流下で系内を58℃付近に保ち撹拌しながら10時間重合反応し、アクリル系ポリマー(B1)を得た。上記アクリル系ポリマー(B1)のカルボン酸当量は6.89×10−4当量/g、重量平均分子量は2.9×104であった。
上記アクリル系ポリマー(A1)溶液100重量部(固形分)に対して、上記アクリル系ポリマー(B1)0.50重量部、シランカップリング剤として3−クリシドキシプロピルトリメトキシシラン0.20重量部を加え、これらを均一に混合して光学部材用粘着剤組成物を調製した。
シリコーン剥離処理したポリエチレンテレフタレート(PET)フィルム(東レ社製、厚さ:38μm)上に上記粘着剤組成物溶液を塗布し、110℃で5分間乾燥することにより溶剤を除去して粘着剤層(乾燥後の厚さ25μm)を形成した。ゲル分率は76%であった。上記粘着剤層を偏光板に転写し、評価用粘着剤付光学部材を作製した。
上記アクリル系ポリマー(B1)0.50重量部に代えて、上記アクリル系ポリマー(B1)5.0重量部を用いた以外は、実施例1と同様の方法により光学部材用粘着剤組成物を調製した。
上記アクリル系ポリマー(B1)0.50重量部に代えて、上記アクリル系ポリマー(B1)15重量部を用いた以外は、実施例1と同様の方法により光学部材用粘着剤組成物を調製した。
(アクリル系ポリマー(A2)の調製)
ホモミキサーに、2−エチルヘキシルアクリレート90重量部、ブチルアクリレート8.0重量部、アクリロニトリル2重量部、アクリル酸0.5重量部、2−ヒドロキシエチルアクリレート0.10重量部、3−アクリロキシプロピルトリエトキシシラン0.10重量部、反応性乳化剤としてアクアロンHS−20(第一工業製薬社製)2.0重量部、イオン交換水25重量部を仕込み、これらを乳化することによって乳化液を調製した。
攪拌羽根、温度計、窒素ガス導入管、冷却器を備えた4つ口フラスコに、ブチルアクリレート100重量部、アクリル酸5.0重量部、ラウリルメルカプタン1.0重量部、重合開始剤として2,2’−アゾビスイソブチロニトリル(和光純薬社製)0.10重量部を加えて、十分に窒素置換した後、窒素気流下で系内を55℃付近に保ち撹拌しながら12時間重合反応し、アクリル系ポリマー(B2)溶液を得た。上記アクリル系ポリマー(B2)のカルボン酸当量は6.55×10−4当量/g、重量平均分子量は3.5×104であった。
上記アクリル系ポリマー(A2)溶液100重量部(固形分)に対して、上記アクリル系ポリマー(B2)1.0重量部、シランカップリング剤として3−グリシドキシプロピルトリメトキシシラン0.20重量部を加え、これらを均一に混合して光学部材用粘着剤組成物を調製した。
シリコーン剥離処理したポリエチレンテレフタレート(PET)フィルム(東レ社製、厚さ:38μm)上に上記粘着剤組成物溶液を塗布し、110℃で5分間乾燥することにより溶剤を除去して粘着剤層(乾燥後の厚さ25μm)を形成した。ゲル分率は75%であった。上記粘着剤層を偏光板に転写し、評価用粘着剤付光学部材を作製した。
上記アクリル系ポリマー(B2)1.0重量部に代えて、上記アクリル系ポリマー(B2)15重量部を用いた以外は、実施例4と同様の方法により光学部材用粘着剤組成物を調製した。
上記アクリル系ポリマー(B1)を用いなかった以外は、実施例1と同様の方法により光学部材用粘着剤組成物を調製し、次いで、粘着剤層、及び評価用粘着剤付光学部材を作製した。上記粘着剤層のゲル分率は60%であった。
上記アクリル系ポリマー(B1)0.50重量部に代えて、上記アクリル系ポリマー(B1)30重量部を用いた以外は、実施例1と同様の方法により光学部材用粘着剤組成物を調製した。
シランカップリング剤である上記3−クリシドキシプロピルトリメトキシシランを用いなかった以外は、実施例1と同様の方法により光学部材用粘着剤組成物を調製し、次いで、粘着剤層、及び評価用粘着剤付光学部材を作製した。上記粘着剤層のゲル分率は75%であった。
上記3−クリシドキシプロピルトリメトキシシラン0.20重量部に代えて、上記3−クリシドキシプロピルトリメトキシシラン3.0重量部を用いた以外は、実施例1と同様の方法により光学部材用粘着剤組成物を調製した。
(アクリル系ポリマー(A3)の調製)
上記アクリル酸0.50重量部に代えて、上記アクリル酸5.0重量部を用いた以外は、実施例4と同様の方法によりアクリル系ポリマー(A3)溶液を得た。上記アクリル系ポリマー(A3)のカルボン酸当量は6.61×10−4当量/gであった。
上記アクリル系ポリマー(A2)溶液100重量部(固形分)に代えて、上記アクリル系ポリマー(A3)溶液100重量部(固形分)を用いた以外は、実施例4と同様の方法により光学部材用粘着剤組成物を調製した。
また、上記光学部材用粘着剤組成物を用いた以外は、実施例1と同様の方法により、粘着剤層、及び評価用粘着剤付光学部材を作製した。上記粘着剤層のゲル分率は80%であった。
(アクリル系ポリマー(B3)の調製)
上記アクリル酸5.0重量部に代えて、上記アクリル酸1.0重量部を用いた以外は、実施例1と同様の方法によりアクリル系ポリマー(B3)を得た。上記アクリル系ポリマー(A3)のカルボン酸当量は1.45×10−4当量/g、重量平均分子量は8.5×105であった。
上記アクリル系ポリマー(B1)0.50重量部に代えて、上記アクリル系ポリマー(B3)0.50重量部を用いた以外は、実施例1と同様の方法により光学部材用粘着剤組成物を調製した。
また、上記光学部材用粘着剤組成物を用いた以外は、実施例1と同様の方法により、粘着剤層、及び評価用粘着剤付光学部材を作製した。上記粘着剤層のゲル分率は72%であった。
Claims (7)
- モノマー単位として不飽和カルボン酸0.2〜2重量%含有する、エマルション重合により得られた(メタ)アクリル系ポリマー(A)100重量部、
モノマー単位として不飽和カルボン酸1〜7重量%含有し、前記(メタ)アクリル系ポリマー(A)のカルボン酸当量より大きいカルボン酸当量を有し、重量平均分子量が2000〜50000の範囲にある(メタ)アクリル系ポリマー(B)0.1〜20重量部、及び、
シランカップリング剤0.01〜1重量部含有してなることを特徴とする光学部材用粘着剤組成物。 - 前記(メタ)アクリル系ポリマー(A)100重量部に対し、前記(メタ)アクリル系ポリマー(B)0.1〜3重量部含有してなる請求項1に記載の光学部材用粘着剤組成物。
- 前記(メタ)アクリル系ポリマー(A)が、ラジカル重合性官能基を含む反応性乳化剤を用いたエマルション重合により得られたアクリル系ポリマーである請求項1〜2のいずれかに記載の光学部材用粘着剤組成物。
- 請求項1〜3のいずれかに記載の光学部材用粘着剤組成物を架橋してなる光学部材用粘着剤層。
- 請求項1〜3のいずれかに記載の光学部材用粘着剤組成物を架橋してなる粘着剤層を支持フィルム上に形成してなる光学部材用粘着シート類。
- 請求項4記載の光学部材用粘着剤層を、光学部材の片面又は両面に形成してなることを特徴とする粘着剤付光学部材。
- 請求項6に記載の粘着剤付光学部材を少なくとも1枚用いた画像表示装置。
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