JP7546687B2 - 防眩フィルム積層体、偏光板、およびディスプレイ装置 - Google Patents
防眩フィルム積層体、偏光板、およびディスプレイ装置 Download PDFInfo
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- JP7546687B2 JP7546687B2 JP2022551370A JP2022551370A JP7546687B2 JP 7546687 B2 JP7546687 B2 JP 7546687B2 JP 2022551370 A JP2022551370 A JP 2022551370A JP 2022551370 A JP2022551370 A JP 2022551370A JP 7546687 B2 JP7546687 B2 JP 7546687B2
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Description
前記防眩層の外部表面に形成された押され部の個数が0.001個/m2であり、
前記押され部は200μm~600μmの直径を有して前記防眩層の平均厚さの80%以下の厚さを有する、防眩フィルム積層体が提供され得る。
前記防眩層の外部表面に形成された押され部の個数が0.001個/m2であり、
前記押され部は200μm~600μmの直径を有して前記防眩層の平均厚さの80%以下の厚さを有する、防眩フィルム積層体が提供され得る。
下記表1に記載された成分を混合して防眩層形成用コーティング組成物を製造した。
PETA:ペンタエリトリトールトリアクリレート
EB220:6官能ポリウレタンアクリレートオリゴマー(SK Cytec)
I-184:開始剤(Irgacure 184、Ciba社)
有機微粒子:XX-103BQ(2.0μm 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(積水化成品工業社製品)
MA-ST(MeOH中の30%):大きさ10~15nmのナノシリカ粒子がメタノールに分散した分散液(日産化学社製品)
T440:TEGO(登録商標) Glide 440ポリエーテル-改質されたポリシロキサン(Tego Evonik社製品)
T270:TEGO(登録商標) Glide 270ポリエーテル-改質されたポリシロキサン(Tego Evonik社製品)
F444:メガパックF444(DIC株式会社製造:パーフルオロアルキルエチレンオキシド付加物:常温常圧で液相)
IPA:イソプロピルアルコール
n-BuOH:n-ブタノール
MIBK:メチルイソブチルケトン
n-BA:n-ブチルアセテート
PETフィルム(東洋紡社製品:厚さ80μm)上に前記製造された防眩層形成用コート液それぞれを#12番マイヤーバー(mayer bar)でコートした後40℃の温度で2分乾燥し、UV硬化して防眩層(コーティングの厚さは4μm)を形成した。UV硬化時、UVランプはH bulbを用い、窒素雰囲気下で硬化反応を行い、硬化時に照射されたUV光量は150mJ/cm2である。
前記実施例および比較例それぞれで得られた防眩フィルム積層体の表面に対して自動検査機(製品名:境界透過自動検査機/製造会社:Next Eye)および電荷結合素子(CCD)カメラを用いてモニタリングした。この際、防眩フィルム積層体の表面に対する反射および透過モードを総合して白点および黒点に分かれて記録され、押されは黒点でマーキングされる。
1.防眩フィルム積層体のヘイズ評価
前記実施例および比較例それぞれで得られた防眩フィルム積層体から4cm×4cmの試験片を準備してヘイズ測定器(HM-150,A光源、村上社)で3回測定して平均値を計算し、これを全体ヘイズ値として算出した。測定時、透光度とヘイズは同時に測定され、透光度はJIS K 7361規格、ヘイズはJIS K 7136規格によって測定した。
前記実施例および比較例それぞれで得られた防眩フィルム積層体に対してXPS装置(モデル名:K-Alpha Thermo Fisher Scientific)を用いてCAE(Constant Analyzer Energy)モードでサーベイ(survey)スペクトルおよびナロースキャン(narrow scan)スペクトルを得てフッ素(F)、炭素(C)およびケイ素(Si)の含有量(確認された成分のナロースキャンデータで各ピークの面積を求めて含有量を測定)を測定した。
前記実施例および比較例それぞれで得られた防眩フィルム積層体に対して、ナノシステム社のOptical profiler system NV-2700を用いてWSI(White Scanning interferometer)モードで310μm×230μm領域で表面形状と粗さを6ヶ所以上測定してこれを10回繰り返して算術平均粗さRaを得た(測定基準はNV-2700装置で採用したものに従う)。
耐スクラッチ測定機器(KPD-301、キベイエンティ)を用いてスチールウール(#0000)に荷重をかけて幅2.5cm、長さ13cmの区間を27rpmの速度で10回往復して実施例および比較例から得られた反射防止フィルムの表面を擦った。肉眼で観察される1cm以下のスクラッチ1個の以下が観察される最大荷重を測定した。
Claims (10)
- 高分子基材;ならびに
バインダ樹脂および有機微粒子および/または無機微粒子を含む防眩層;を含み、
前記防眩層の外部表面に形成された押され部の個数が0.001個/m2以下であり、
前記押され部は200μm~600μmの直径を有して前記防眩層の平均厚さの80%以下の厚さを有し、
前記防眩層は1~10μmの厚さを有し、
前記防眩層は前記バインダ樹脂100重量部に対して前記有機微粒子1~10重量部または前記無機微粒子0.1~5重量部を含み、
前記防眩層に含まれるバインダ樹脂はビニル系単量体若しくはオリゴマー又は(メタ)アクリレート単量体若しくはオリゴマーから形成された(共)重合体を含み、
前記防眩層は前記バインダ樹脂100重量部に対して0.3重量部以上のフッ素系添加剤および0.25重量部以上のケイ素系添加剤を含み、
前記ケイ素系添加剤は、1)ポリエーテル-改質されたポリシロキサン共重合体または2)相異なる重量平均分子量を有するポリエーテル-改質されたポリシロキサン共重合体2種以上を含み、
前記フッ素系添加剤は、フッ素系共重合体またはフッ素及びケイ素を含む共重合体を含む、
防眩フィルム積層体。 - 前記高分子基材は10~150μmの厚さを有する、請求項1に記載の防眩フィルム積層体。
- 前記高分子基材の厚さに対して前記防眩層の厚さの比率が0.008~0.8である、請求項1又は2に記載の防眩フィルム積層体。
- 前記押され部でのフッ素(F)/炭素(C)元素間の重量比率が3.0%以下である、請求項1から3のいずれか一項に記載の防眩フィルム積層体。
- 前記防眩層の表面でフッ素(F)/炭素(C)元素間の重量比率が10%以上であり、
ケイ素(Si)/炭素(C)元素間の重量比率が5~15%である、請求項1から4のいずれか一項に記載の防眩フィルム積層体。 - 前記防眩層の表面で、前記フッ素(F)およびケイ素(Si)の元素総和/炭素(C)元素の間の重量比率が15~40%である、請求項5に記載の防眩フィルム積層体。
- 前記防眩層に含まれる有機微粒子は1~50μmの断面直径を有し、
前記防眩層に含まれる無機微粒子は1nm~500nmの断面直径を有する、請求項1から6のいずれか一項に記載の防眩フィルム積層体。 - 前記防眩層の表面で測定した算術平均粗さRaが100nm以下である、請求項1から7のいずれか一項に記載の防眩フィルム積層体。
- 請求項1から8のいずれか一項に記載の防眩フィルム積層体を含む、偏光板。
- 請求項9に記載の偏光板を含む、ディスプレイ装置。
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