METHOD FOR PRODUCING POLARIZATION FILM AND APPARATUS FOR PRODUCING POLARIZATION FILM
To provide a method for stably and continuously producing a polarization film having good optical performance.SOLUTION: A method for producing a polarization film includes: a step of immersing a polyvinyl alcohol resin film in a dye treatment tank which stores a dye treatment liquid containing iodin...
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| Format: | Patent |
| Sprache: | eng ; jpn |
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| Zusammenfassung: | To provide a method for stably and continuously producing a polarization film having good optical performance.SOLUTION: A method for producing a polarization film includes: a step of immersing a polyvinyl alcohol resin film in a dye treatment tank which stores a dye treatment liquid containing iodine; a step of immersing a polyvinyl alcohol resin film after the step of immersing the resin film in the dye treatment tank in a crosslinking treatment tank which stores a crosslinking treatment liquid containing iodide salt and a crosslinking agent; a step of producing a liquid containing hydrogen iodide using a liquid containing iodide salt with a bipolar membrane electrodialyzer; and a step of adding at least a part of the liquid containing the hydrogen iodide to the crosslinking treatment tank.SELECTED DRAWING: Figure 1
【課題】光学性能の良好な偏光フィルムを安定的に連続製造することのできる方法を提供する。【解決手段】ポリビニルアルコール系樹脂フィルムを、ヨウ素を含有する染色処理液を収容する染色処理槽に浸漬させる工程；染色処理槽に浸漬させる工程後のポリビニルアルコール系樹脂フィルムを、ヨウ化物塩及び架橋剤を含有する架橋処理液を収容する架橋処理槽に浸漬させる工程；ヨウ化物塩を含有する液を用いて、バイポーラ膜電気透析装置によりヨウ化水素を含有する液を生成させる工程；ヨウ化水素を含有する液の少なくとも一部を架橋処理槽に添加する工程を含む偏光フィルムの製造方法が提供される。【選択図】図１ |
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