JP2021532423A - 反射防止フィルム、偏光板およびディスプレイ装置 - Google Patents
反射防止フィルム、偏光板およびディスプレイ装置 Download PDFInfo
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Abstract
Description
本出願は2019年5月28日付韓国特許出願第10−2019−0062632号および2020年5月27日付韓国特許出願第10−2020−0063618号に基づいた優先権の利益を主張し、当該韓国特許出願の文献に開示されたすべての内容は本明細書の一部として含まれる。
下記表1に記載された成分を混合してハードコーティング層形成用コーティング液(B1、B2およびB3)を製造した。
PETA:ペンタエリトリトールトリアクリレート
UA−306T:ウレタンアクリレートロトルエンジイソシアネートとペンタエリトリトールトリアクリレートの反応物(Kyoeisha製品)
8BR−500:光硬化型ウレタンアクリレートポリマー(Mw 200,000、Taisei Fine Chemical製品)
IRG−184:開始剤(Irgacure 184、Ciba社)
Tego−270:Tego社レベリング剤
BYK350:BYK社レベリング剤
IPA:イソプロピルアルコール
XX−103BQ(2.0μm 屈折率1.515:ポリスチレンとポリメチルメタクリレートの共重合粒子(Sekisui Plastic製品)
XX−113BQ(2.0μm 屈折率1.555:ポリスチレンとポリメチルメタクリレートの共重合粒子(Sekisui Plastic製品)
MA−ST(30% in MeOH):大きさ10〜15nmのナノシリカ粒子がメチルアルコールに分散された分散液(Nissan Chemical製品)
トリメチロールプロパントリアクリレート(TMPTA)100g、中空型シリカナノ粒子(直径範囲:約42nm〜66nm、JSC catalyst and chemicals社製品)283g、ソリッド型シリカナノ粒子(直径範囲:約12nm〜19nm)59g、第1含フッ素化合物(X−71−1203M、ShinEtsu社)115g、第2含フッ素化合物(RS−537、DIC社)15.5gおよび開始剤(Irgacure 127、Ciba社)10gを、MIBK(メチルイソブチルケトン)溶媒に固形分濃度3重量%になるように希釈して低屈折層形成用コーティング液(光硬化性コーティング組成物)を製造した。
ジペンタエリトリトールヘキサアクリレート(DPHA)100g、中空型シリカナノ粒子(直径範囲:約51nm〜72nm、JSC catalyst and chemicals社製品)143g、ソリッド型シリカナノ粒子(直径範囲:約12nm〜19nm)29g、含フッ素化合物(RS−537、DIC社)56gおよび開始剤(Irgacure 127、Ciba社)3.1gを、MIBK(methyl isobutyl ketone)溶媒に固形分濃度3.5重量%になるように希釈して低屈折層形成用コーティング液(光硬化性コーティング組成物)を製造した。
下記表2に記載されたそれぞれの光透過性基材(厚さ80μm)上に前記製造されたハードコーティング層形成用コーティング液(B1、B2、B3)それぞれを#12番mayer barでコーティングした後、60℃の温度で2分乾燥し、UV硬化してハードコーティング層(コーティング厚さは5μm)を形成した。UVランプはH bulbを使用し、窒素雰囲気下で硬化反応を行った。硬化時照射されたUV光量は100mJ/cm2である。
1.反射モードのX線回折(XRD)評価
実施例および比較例で得られた反射防止フィルムに対して2cm*2cm(横*縦)大きさでサンプルを準備した後、1.54Åの波長のCu−Kα線を照射して反射モードのX線回折(XRD)パターンを測定した。
−Secondary(diffracted beam)optics:soller slit 2.3°
−LynxEye detector(1D detector)
実施例および比較例で得られた反射防止フィルムの裏面(ハードコーティング層が形成されていない光透過性基材の一面)を暗色処理した以後に、Solidspec 3700(SHIMADZU)装備の反射率(Reflectance)モードを用いて380〜780nm波長領域で平均反射率を測定し、その結果を下記表3に記載した。
実施例および比較例で得られた反射防止フィルムに対して任意のポイントを20個を選定し、それぞれのポイントに対して前記‘2.平均反射率評価方法’で平均反射率を測定した。その後、測定された20個のポイントの平均反射率の算術平均値を求めた。その後、各ポイントで平均反射率と前記算術平均値間の差(絶対値)を平均反射率偏差と定義し、各20個ポイントでそれぞれ平均反射率偏差を計算した。20個の平均反射率偏差のうちの最も大きな値を有する平均反射率偏差を下記表3に記載した。
実施例および比較例で得られた反射防止フィルムに対して任意のポイントを20個選定し、それぞれのポイントに対して透光率を測定した。
実施例および比較例で得られた反射防止フィルムの透湿率は38℃の温度および100%相対湿度下でMOCON test装備(PERMATRAN−W、MODEL3/61)を用いて測定した。
(1)第2ハードコーティング層形成用コーティング液(A)の製造
トリメチロイルプロパントリアクリレート28g、KBE−403 2g、開始剤KIP−100f、0.1g、レベリング剤(Tego wet 270)0.06gを均一に混合して第2ハードコーティング層形成用コーティング液(A)を製造した。
偏光子であるポリビニルアルコール偏光子(厚さ:25um、製造会社:エルジー化学)の一面に前記第2ハードコーティング層形成用コーティング液(A)を7umの厚さで塗布し、窒素パージング下で乾燥されたコーティング物に500mJ/cm2の紫外線を照射して、第2ハードコーティング層が一面に形成された偏光子を製造した。
下記表4に記載された通り、前記実施例1〜5および比較例1〜4でそれぞれ得られた反射防止フィルムの光透過性基材上に前記製造例3で得られた第2ハードコーティング層が一面に形成された偏光子をUV接着剤で接着して偏光板を製造した。具体的に、前記反射防止フィルムの光透過性基材と前記偏光子が直接的に接するようにして偏光板を製造し、製造された偏光板は低屈折層、ハードコーティング層、光透過性基材、偏光子および第2ハードコーティング層が順次に積層されている。
1.平均反射率偏差および透光率偏差評価
前記実施例6〜10および比較例5〜8に対して、前述のような同様な方法で平均反射率偏差および透光率偏差を測定して下記表5に示した。
前記実施例6〜10および比較例5〜8に対して一辺の長さが10cmである正四角形に裁断し、TV用ガラス(横12cm、縦12cm、厚さ0.7mm)の一面に接合して熱衝撃評価用サンプルを製造した。この時、偏光子のMD方向が正四角形の一辺と平行するように偏光板を裁断した。裁断したサンプルを熱衝撃チャンバーに垂直に立てておき、常温から80℃に昇温して30分放置し、その後、温度を−30℃に低めて30分放置後、常温に温度調節することを1Cycleとして、総100Cycleを繰り返した。その後、評価用サンプルの偏光子の間に発生したクラックと偏光子の間に隙ができたことを肉眼で確認して長さ1cm以上のクラックの個数を確認し、その結果を下記表5に記載した。
Claims (16)
- 光透過性基材;ハードコーティング層;および低屈折層を含み、
反射(Reflection)モードのX線回折(XRD)パターンで、25〜27°の2θ値で第1ピークが現れ、46〜48°の2θ値で第2ピークが現れ、
前記第1ピークの強度P1に対する前記第2ピークの強度P2の比率(P2/P1)は0.01以上である、反射防止フィルム。 - 前記光透過性基材は、30〜40℃の温度および90〜100%相対湿度の条件で透湿率が50g/m2・day以下である、請求項1に記載の反射防止フィルム。
- 前記低屈折層は、バインダー樹脂、および前記バインダー樹脂に分散された無機微粒子を含む、請求項1または2に記載の反射防止フィルム。
- 前記バインダー樹脂は、光重合性化合物および光反応性官能基を含む含フッ素化合物間の架橋重合体を含む、請求項3に記載の反射防止フィルム。
- 前記無機微粒子は、0.5〜100nmの直径を有するソリッド型無機ナノ粒子および1〜200nmの直径を有する中空型無機ナノ粒子からなる群より選択された1種以上を含む、請求項3または4に記載の反射防止フィルム。
- 前記ハードコーティング層は、光硬化性樹脂を含むバインダー樹脂、および前記バインダー樹脂に分散された有機または無機微粒子を含む、請求項1〜5のいずれか一項に記載の反射防止フィルム。
- 前記ハードコーティング層のバインダー樹脂は、数平均分子量10,000以上の高分子量(共)重合体をさらに含む、請求項6に記載の反射防止フィルム。
- 前記光透過性基材は、
波長400nm〜800nmで測定される厚さ方向のリタデーション(Rth)が5,000nm以上であり、
一方向の引張強度に対する、前記一方向と垂直な方向の引張強度の比率は2以上であり、
前記一方向の引張強度は前記一方向と垂直な方向の引張強度より小さい値を有する、
請求項1〜7のいずれか一項に記載の反射防止フィルム。 - 前記光透過性基材は、ポリエチレンテレフタレートフィルムである、請求項1〜8のいずれか一項に記載の反射防止フィルム。
- 前記反射防止フィルムは、380nm〜780nmの波長帯領域で平均反射率が2.0%以下である、請求項1〜9のいずれか一項に記載の反射防止フィルム。
- 前記反射防止フィルムは、
平均反射率偏差が0.2%p以下であり、
透光率偏差が0.2%p以下である、請求項1〜10のいずれか一項に記載の反射防止フィルム。 - 請求項1〜11のいずれか一項に記載の反射防止フィルムおよび偏光子を含む偏光板。
- 偏光子と、
前記偏光子を中心にして対向するように位置する10μm以下の厚さを有する第2ハードコーティング層および請求項1〜11のいずれか一項に記載の反射防止フィルムを含む、偏光板。 - 前記偏光子;前記第2ハードコーティング層;および前記反射防止フィルム;を合わせた総厚さが200μm以下である、請求項13に記載の偏光板。
- 前記偏光子の一面には前記10μm以下の厚さを有する第2ハードコーティング層が位置し、他の一面には前記反射防止フィルムの光透過性基材が位置し、
前記光透過性基材は、
波長400nm〜800nmで測定される厚さ方向のリタデーション(Rth)が5,000nm以上であり、
一方向の引張強度に対する、前記一方向と垂直な方向の引張強度の比率は2以上であり、
前記一方向の引張強度は前記一方向と垂直な方向の引張強度より小さい値を有する、請求項13または14に記載の偏光板。 - 請求項1〜11のいずれか一項に記載の反射防止フィルムを含むディスプレイ装置。
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