JP2018045234A - ハードコーティングフィルム及びこれを備えた画像表示装置 - Google Patents
ハードコーティングフィルム及びこれを備えた画像表示装置 Download PDFInfo
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Abstract
Description
基材;
前記基材の一方の面に形成された第1ハードコーティング層;及び
前記基材の他方の面に形成された第2ハードコーティング層を含み、
前記第1ハードコーティング層は、下記の式1で定義される修正破断強度(Corrected Breaking Strength)が50〜500MPaであるハードコーティングフィルムを提供する。
前記式中、
弾性率は応力−歪み曲線において弾性率を示し、
破断伸び率は応力−歪み曲線において破断伸び率を示す。
基材;
前記基材の一方の面に形成された第1ハードコーティング層;及び
前記基材の他方の面に形成された第2ハードコーティング層を含み、
前記第1ハードコーティング層は、下記の式1で定義される修正破断強度が50〜500MPaであるハードコーティングフィルムに関する。
前記式中、
弾性率は応力−歪み曲線において弾性率を示し、
破断伸び率は応力−歪み曲線において破断伸び率を示す。
58.2重量%の2官能ウレタンアクリレート(新中村化学社製、UA−232P製品)、40重量%のメチルエチルケトン、1.0重量%の光開始剤(1−hydroxycyclohexyl phenyl ketone)、0.5重量%の光開始剤(diphenyl(2,4,6−trimethylbenzoyl)−phosphine oxide)、及び0.3重量%のレべリング剤(BYKケミー社製、BYK−UV 3570)を撹拌機を利用して配合し、ポリプロピレン(PP)材質のフィルタでろ過して、ハードコーティング組成物を製造した。
58.5重量%の2官能ウレタンアクリレート(共栄化学社製、UF8001G製品)、40重量%のメチルエチルケトン、1.0重量%の光開始剤(1−hydroxycyclohexyl phenyl ketone)、及び0.5重量%の光開始剤(diphenyl(2,4,6−trimethylbenzoyl)−phosphine oxide)を撹拌機を利用して配合し、ポリプロピレン(PP)材質のフィルタでろ過して、ハードコーティング組成物を製造した。
59.0重量%の2官能ウレタンアクリレート(ミウォンスペシャリティケミカル社製、SC2404製品)、40重量%のメチルエチルケトン、及び1.0重量%の光開始剤(1−hydroxycyclohexyl phenyl ketone)を撹拌機を利用して配合し、ポリプロピレン(PP)材質のフィルタでろ過して、ハードコーティング組成物を製造した。
70重量%の2官能ウレタンアクリレート(新中村化学社製、UA−122P製品)、25重量%のメチルエチルケトン、4.5重量%の光開始剤(1−hydroxycyclohexyl phenyl ketone)、及び0.5重量%のレべリング剤(BYKケミー社製、BYK−3570製品)を撹拌機を利用して配合し、ポリプロピレン(PP)材質のフィルタでろ過して、ハードコーティング組成物を製造した。
38重量%のメチルエチルケトン、30重量%のメチルエチルケトンシリカゾル(MEK−AC−2140Z、日産化学社製、粒径10〜15nm)、30重量%の3官能モノマー(ミウォン社製、M340製品)、1.0重量%の光開始剤(1−hydroxycyclohexyl phenyl ketone)、及び1.0重量%のレべリング剤(BYKケミー社製、BYK−3570製品)を撹拌機を利用して配合し、ポリプロピレン(PP)材質のフィルタでろ過して、ハードコーティング組成物を製造した。
実施例1:
製造例1に従い製造した第1ハードコーティング層形成組成物を、乾燥後の厚さ60μmでポリイミド基材(100μm)の一方の面にコートした後、80℃で5分間溶剤を乾燥し、組成物の硬化のためにUV積算量1.5J/cm2を照射した。前記過程を3回繰り返し行って乾燥後の厚さ180μmの第1ハードコーティング層を得た。次いで、製造例5に従い製造した第2ハードコーティング層形成組成物を、乾燥後の厚さ10μmでポリイミド基材の他方の面にコートした後、80℃で2分間溶剤を乾燥し、組成物の硬化のためにUV積算量0.5J/cm2を照射して、第2ハードコーティング層を得た。前記製造方法にて実施例1のハードコーティングフィルムを製造した。
製造例2に従い製造した第1ハードコーティング層形成組成物を、製造例1に従い製造した第1ハードコーティング層形成組成物の代わりに用いることを除いては、前記実施例1と同じ方法にてハードコーティングフィルムを製造した。
製造例3に従い製造した第1ハードコーティング層形成組成物を、製造例1に従い製造した第1ハードコーティング層形成組成物の代わりに用いることを除いては、前記実施例1と同じ方法にてハードコーティングフィルムを製造した。
製造例4に従い製造した第1ハードコーティング層形成組成物を、製造例1に従い製造した第1ハードコーティング層形成組成物の代わりに用いることを除いては、前記実施例1と同じ方法にてハードコーティングフィルムを製造した。
実験例1−1:
製造例1〜4に従い製造した第1ハードコーティング層形成組成物を、それぞれ厚さ40μmのZF−14フィルム(ゼオン社製)の一方の面にコートした後、80℃で5分間溶剤を乾燥し、組成物の硬化のためにUV積算量1.5J/cm2を照射した。前記過程を3回繰り返し行って、乾燥後の厚さ180μmの第1ハードコーティング層を得た。そして、用心深く剥離して得られた第1ハードコーティング層の応力−歪み曲線を、ASTM D 882に基づいて万能試験機(Universal Testing Machine:UTM)を利用して測定した。次いで、前記応力−歪み曲線から導出された弾性率と破断伸び率から、下記の式1により修正破断強度を導出した。
前記導出された修正破断強度を下記の表1に表した。
前記実施例及び比較例に従い製造されたハードコーティングフィルムの物性を後述する方法にて測定し、その結果を下記の表2に表した。
ハードコーティングフィルムの面間の間隔が6mmになるように半分に折り曲げてから、24時間放置後、該フィルムを元に戻したときにおける、折り曲げ部分にクラックが発生したか否かを目視にて評価した。その結果は次のように記載した。
○:折り曲げ部分にクラック発生なし
×:折り曲げ部分にクラック発生あり
(2)高温・高湿での耐曲げ性
ハードコーティングフィルムの面間の間隔が6mmになるように半分に折り曲げてから、85℃、85%の相対湿度下でフィルムを24時間放置後、フィルムの異常の有無を評価した。その結果は次のように記載した。
○:折り曲げ部分にクラック発生なし
×:折り曲げ部分にクラック発生あり
(3)耐衝撃性(ボールドロップテスト)
〔ガラス(Glass)破壊〕
ハードコーティングフィルムの第1ハードコーティング層を25μmのOCA(弾性率0.08MPa)でガラスに貼り付けた後、高さ50cmから50gのスチールボール(Steel ball)を5回落として、フィルム下部のガラスが破壊されるか否かを確認した。その結果は次のように記載した。
○:5回のうち3回以上ガラス破壊なし
×:5回のうち3回以上ガラス破壊あり
〔表面打痕発生〕
前記ボールドロップ(Ball Drop)評価を実施するとき、スチールボール(Steel ball)により第2ハードコーティング層が破壊あるいは圧痕が付いたか否かを確認した。その結果は次のように記載した。
○:5回のうち3回以上第2ハードコーティング層の破壊及び圧痕なし
×:5回のうち3回以上第2ハードコーティング層の破壊及び圧痕あり
Claims (8)
- 基材;
前記基材の一方の面に形成された第1ハードコーティング層;及び
前記基材の他方の面に形成された第2ハードコーティング層を含み、
前記第1ハードコーティング層は、下記の式1で定義される修正破断強度が50〜500MPaであるハードコーティングフィルム。
修正破断強度(MPa)=弾性率(MPa)×破断伸び率(%)×1/100
前記式中、
弾性率は応力−歪み曲線において弾性率を示し、
破断伸び率は応力−歪み曲線において破断伸び率を示す。 - 前記第1ハードコーティング層は、ウレタンアクリレートオリゴマー、光開始剤、及び溶剤を含む第1ハードコーティング層形成組成物から形成される、請求項1に記載のハードコーティングフィルム。
- 前記ウレタンアクリレートオリゴマーは、2官能ウレタンアクリレートオリゴマーである、請求項2に記載のハードコーティングフィルム。
- 前記第2ハードコーティング層は、光硬化型樹脂、無機ナノ粒子、光開始剤、及び溶剤を含む第2ハードコーティング層形成組成物から形成される、請求項1に記載のハードコーティングフィルム。
- 請求項1〜4のいずれか一項に記載のハードコーティングフィルムが備えられた画像表示装置。
- 請求項1〜4のいずれか一項に記載のハードコーティングフィルムが備えられたフレキシブル(flexible)表示装置のウインドウ。
- 請求項1〜4のいずれか一項に記載のハードコーティングフィルムが備えられた偏光板。
- 請求項1〜4のいずれか一項に記載のハードコーティングフィルムが備えられたタッチセンサー。
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