JP2007098224A - 塗布方法及び装置、並びに光学フィルム及び反射防止フィルムの製造方法 - Google Patents
塗布方法及び装置、並びに光学フィルム及び反射防止フィルムの製造方法 Download PDFInfo
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- JP2007098224A JP2007098224A JP2005288789A JP2005288789A JP2007098224A JP 2007098224 A JP2007098224 A JP 2007098224A JP 2005288789 A JP2005288789 A JP 2005288789A JP 2005288789 A JP2005288789 A JP 2005288789A JP 2007098224 A JP2007098224 A JP 2007098224A
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Abstract
【解決手段】バックアップローラ11に支持されて連続走行するウェブW上に、スロットダイ12を使用して塗布液を塗布する塗布方法において、バックアップローラ11に対するスロットダイ先端12Aのダイ幅方向中央部とダイ幅方向両端部とのクリアランス差L1〜10μmになるようにスロットダイ先端12Aを凹形状にした状態で塗布する。
【選択図】 図5
Description
に係り、特に、バックアップローラに支持されて連続走行する帯状支持体上に、スロットダイを使用して塗布液を塗布して光学フィルム、例えば反射防止フィルムを製造するための塗布方法及び装置、並びに光学フィルム及び反射防止フィルムの製造方法に関する。
(数式VIII)
x=(4πa3/3) /(4πb3/3)×100
= (a/b)3×100
好ましくは10〜60% 、更に好ましくは20〜60% 、最も好ましくは30〜60% である。中空のシリカ粒子をより低屈折率に、より空隙率を大きくしようとすると、外殻の厚さが薄くなり、粒子の強度としては弱くなるため、耐擦傷性の観点から1.17未満の低屈折率の粒子は成り立たない。
(R10)m−Si(X)4−m
(式中、R10は置換もしくは無置換のアルキル基又は置換もしくは無置換のアリール基を表す。Xは水酸基又は加水分解可能な基を表す。mは1〜3の整数を表す。)
一般式Aで表される化合物で特に好ましいのは、架橋又は重合性官能基として(メタ)アクリロイル基を有する化合物であり、たとえば、3−アクリロキシプロピルトリメトキシシラン、3−メタクリロキシプロピルトリメトキシシランなどが挙げられる。
アルカリ液の中に反射防止フィルムを適切な条件で浸漬して、フイルム全表面のアルカリと反応性を有する全ての面を鹸化処理する手法であり、特別な設備を必要としないため、コストの観点で好ましい。アルカリ液は、水酸化ナトリウム水溶液であることが好ましい。好ましい濃度は0.5〜3mol/Lであり、特に好ましくは1〜2mol/Lである。好ましいアルカリ液の液温は30〜70°C、特に好ましくは40〜60°Cである。
上述の浸漬法における反射防止膜へのダメージを回避する手段として、適切な条件でアルカリ液を反射防止膜を有する表面と反対側の表面のみに塗布、加熱、水洗、乾燥するアルカリ液塗布法が好ましく用いられる。なお、この場合の塗布とは、鹸化を行う面に対してのみアルカリ液などを接触させることを意味し、この時、反射防止フィルムの貼り合わせ面の水に対する接触角が、10〜50度となるように鹸化処理を行なうことが好ましい。また、塗布以外にも噴霧、液を含んだベルト等に接触させる、などによって行われることも含む。これらの方法を採ることにより、別途、アルカリ液を塗布する設備、工程が必要となるため、コストの観点では(1)の浸漬法に劣る。一方で、鹸化処理を施す面にのみアルカリ液が接触するため、反対側の面にはアルカリ液に弱い素材を用いた層を有することができる。たとえば、蒸着膜やゾルーゲル膜では、アルカリ液によって、腐食、溶解、剥離など様々な影響が起こるため、浸漬法では設けることが望ましくないが、この塗布法では液と接触しないため問題なく使用することが可能である。
上記の条件式において、nxは、フイルム面内の遅相軸方向(屈折率が最大となる方向)の屈折率、nyは、フイルム面内の進相軸方向(屈折率が最小となる方向)の屈折率、nzは、フイルムの厚さ方向の屈折率であり、またdは光学補償層の厚さを表す。
表1は、上記3種類のスロットダイ先端形状を有するスロットダイ12について、塗布速度を10m/分、30m/分、50m/分としたときの塗布可能領域を比較した結果である。3種類のスロットダイ12ともに、スロット開口幅は150μm、塗布量3cc/m2、塗布粘度0.7×10−3Pa・s、ダイ幅方向中央部でのリッププクリアランスC1が50μmになるようにした。
(実施例2)
表2は、上記3種類のスロットダイ先端形状を有するスロットダイ12について、塗布量を15cc/m2、10cc/m2、3cc/m2と少なくしたときの塗布可能領域を比較した結果である。3種類のスロットダイともに、スロット開口幅は150μm、塗布液粘度0.7×10−3Pa・s,塗布速度30m/分、ダイ幅方向中央部でのリップクリアランスC1が50μmになるようにした。
表3は、上記3種類のスロットダイ先端形状を有するスロットダイ12について、塗布液粘度を、6×10−3、3×10−3、0.7×10−3Pa・sと小さくしたときの塗布可能領域を比較した結果である。3種類のスロットダイともに、スロット開口幅は150μm、塗布量3cc/m2、塗布速度30m/分、ダイ幅方向中央部でのリップクリアランスC1が50μmになるようにした。
表4は、上記3種類のスロットダイ先端形状を有するスロットダイ12について、ダイ幅方向中央部のリップクリアランスC1を、40、60、80μmと大きくしたときの塗布可能領域を比較した結果である。3種類のスロットダイともに、スロット開口幅は150μm、塗布液粘度0.7×10−3Pa・s、塗布量3cc/m2、塗布速度30m/分になるようにした。
表5は、上記3種類のスロットダイ先端形状を有するスロットダイ12について、連続走行するウェブに塗布液を塗布したときのウェブ幅方向に塗布量分布を比較したものである。このときのスロット開口幅は150μm、塗布液粘度0.7×10−3Pa・s、塗布量3cc/m2、塗布速度30m/分になるようにした。
表6は、本発明における凹形状のスロットダイ先端形状を有するスロットダイ12について、バックアップローラに対するスロットダイ先端のダイ幅方向中央部とダイ幅方向両端部とのクリアランス差Lを,4、10、15μmと変えて連続走行するウェブWに塗布液を塗布したときのウェブ幅方向に塗布量分布を比較したものである。このときのスロット開口幅は150μm、塗布液粘度0.7×10−3Pa・s、塗布量3cc/m2、塗布速度30m/分になるようにした。
Claims (8)
- バックアップローラに支持されて連続走行する帯状の可撓性支持体上に、スロットダイを使用して塗布液を塗布する塗布方法において、
前記バックアップローラに対する前記スロットダイ先端のダイ幅方向中央部とダイ幅方向両端部とのクリアランス差が1〜10μmになるように、前記スロットダイ先端を凹形状にした状態で塗布することを特徴とする塗布方法。 - 液粘度が3×10−3Pa・s以下の塗布液を使用して塗布量10cc/m2以下になるように低粘度薄膜塗布を行うことを特徴とする請求項1に記載の塗布方法。
- 前記スロットダイ先端と前記可撓性支持体との間に架橋される塗布液のビードの上流側を減圧することを特徴とする請求項1又は2の塗布方法。
- 前記クリアランス差が塗布運転中において維持されるように前記スロットダイの前記ダイ幅方向中央部とダイ幅方向両端部とのクリアランスを調整することを特徴とする請求項1〜3のいずれか1に記載の塗布方法。
- 請求項1〜4のいずれか1項に記載の塗布方法を用いて光学特性を有する塗布層を形成することを特徴とする光学フィルムの製造方法。
- 請求項1〜4のいずれか1項に記載の塗布方法を用いて反射防止機能を備える塗布層を形成することを特徴とする反射防止フィルムの製造方法。
- バックアップローラに支持されて連続走行する帯状の可撓性支持体上に、スロットダイを使用して塗布液を塗布する塗布装置において、
前記スロットダイには、
前記バックアップローラに対する前記スロットダイ先端のダイ幅方向中央部とダイ幅方向両端部とのクリアランス差を調整して、塗布運転中における前記スロットダイ先端を凹形状にするための凹形状形成手段を備えていることを特徴とする塗布装置。 - 前記塗布装置には、前記スロットダイ先端と前記可撓性支持体との間に架橋される塗布液のビードの上流側を減圧する減圧チャンバが設けられていることを特徴とする請求項7の塗布装置。
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JP2008080212A (ja) * | 2006-09-26 | 2008-04-10 | Fujifilm Corp | 塗布装置及び塗布方法 |
JP2009202105A (ja) * | 2008-02-28 | 2009-09-10 | Gunze Ltd | 印刷装置、及び印刷方法 |
JP2009202141A (ja) * | 2008-02-29 | 2009-09-10 | Toray Eng Co Ltd | スリットダイ及びスリットダイコータ |
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