JP7134373B1 - 光学積層体、物品および画像表示装置 - Google Patents
光学積層体、物品および画像表示装置 Download PDFInfo
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Abstract
Description
一例として、ロール状に巻き付けられた透明基材1を用いて光学積層体10を製造する場合を説明する。
まず、平均粒径50nmのシリカ粒子(フィラー)の含有量が樹脂組成物(バインダー樹脂)の固形分全体に対し、28質量%である光硬化性の樹脂組成物を準備した。樹脂組成物は、表1に示すようにシリカ粒子、アクリレート、レベリング剤、及び光重合開始剤を溶剤に溶解させ、最後に凝集剤を加えて調製した。
純水の滴下量:2.0μL
測定温度:25℃
純水を滴下して4秒経過後の接触角を、試験片表面の任意の6か所で測定し、その平均値を純水接触角(WCA)とした。
先ず、10mmのマンドレル(円筒)をセットした、JIS K-5600-5-1:1999に準拠した屈曲試験機(タイプ1マンドレル試験機)に、前述の光学積層体を、防汚層の形成された面が内側に折り曲げられるようにセットした。しかる後、2秒かけて試験装置を折り曲げる事で光学積層体を180°折り曲げ、10秒間保持した。その後、目視及び光学顕微鏡により防汚層のクラックの有無を確認した。
光学積層体の防汚層側表面に、目視及び光学顕微鏡でひび割れなどの異常が見られるまで、マンドレルの直径を小さいものに1mm毎に交換しながら上記の手順を繰り返し、初めてクラックが発見されたマンドレルの直径より1mm大きいマンドレルの直径を、屈曲試験の試験結果とした。耐屈曲性としては、クラックの発生が確認されなかった折り曲げ時のマンドレル直径の最小値が7mm以下のいずれかの値であるものを「○」、8mm以上のいずれかの値であるものを「×」とした。
実施例2~実施例4は、ハードコート層2の膜厚及びハードコート層2を形成するための樹脂組成物に添加する凝集剤の添加量を変えた点が実施例1と異なる。実施例2は、ハードコート層2の膜厚を1.5μmとした。実施例3は、ハードコート層2の膜厚を実施例1と同じく2.9μmとし、凝集剤の添加量を実施例1より増加させた。実施例4は、ハードコート層の膜厚を実施例1と同じく2.9μmとしたが、凝集剤は添加しなかった。
比較例1から比較例4は、ハードコート層2の膜厚及びハードコート層2を形成するための樹脂組成物に添加する凝集剤の添加量を変えた点が実施例1と異なる。比較例1は、実施例1のハードコート層2の膜厚を1μmとした。比較例2はハードコート層2の膜厚を3μmとした。比較例2はハードコート層の膜厚を10μmとした。比較例3はハードコート層2の膜厚を5μmとした。比較例4は、ハードコート層の膜厚を10μmとし、凝集剤の添加量を実施例1より増加させた。
Claims (9)
- 透明基材とハードコート層と光学機能層と防汚層とが順に積層された光学積層体であって、
前記ハードコート層は、ウレタンアクリレートと多官能アクリレートとフィラーを含有し、
前記ハードコート層は、厚みが1.0μm超3μm未満であり、
前記光学機能層は、酸化物膜からなり、
前記光学積層体の表面の10点平均粗さRzは、19nm以上100nm以下であって、
JIS K5600-5-1に準拠した屈曲試験機を用い、前記防汚層が内側となるように180°折り曲げた場合、クラックが発生しない折り曲げ時のマンドレルの直径の最小値が7mm以下のいずれかの値である、
光学積層体。 - 前記光学積層体の表面を原子間力顕微鏡で測定して得られる前記フィラーの凝集体の見かけ上の平均粒子径が150nm以上2200nm以下である、請求項1に記載の光学積層体。
- 前記ハードコート層の表面を原子間力顕微鏡で測定して得られる前記フィラーの凝集体の見かけ上の平均粒子径が110nm以上1600nm以下である、請求項1又は2に記載の光学積層体。
- 前記光学機能層は少なくとも低屈折率層を含む、請求項1~3のいずれか一項に記載の光学積層体。
- 前記光学機能層は低屈折率層と高屈折率層とが交互に積層されたものである、請求項1~4のいずれか一項に記載の光学積層体。
- スチールウール摺動試験を2000サイクルした後の水接触角の値が、前記スチールウール摺動試験前の水接触角の値の80%以上である、請求項1~5のいずれか一項に記載の光学積層体。
- 前記防汚層は、フッ素系化合物を含む、請求項1~6のいずれか一項に記載の光学積層体。
- 請求項1~7のいずれか一項に記載の光学積層体を備える、物品。
- 画面と、前記画面の表面に形成された請求項1~7のいずれか一項に記載の光学積層体とを備える、画像表示装置。
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