| 摘要 |
PURPOSE: A manufacturing method of a cellulose ester film is provided to have low chlorine content, and excellent planarity and transparency by using a solution-softening method. CONSTITUTION: A manufacturing method of a cellulose ester film comprises: a step of manufacturing cellulose ester, and UV absorbent containing solution; a step of flowing down the solution into a support, and forming a flexible membrane by drying the solution at 30-70; a step of separating the flexible membrane from the support, and elongating the flexible membrane by elongation of 1-40% to transversal direction; and a step of drying the elongated flexible membrane at 100-150°C. The solvent of the solution is one or more kinds selected from methylene chloride, N-methylpyrrolidone, 1,4-dioxane, and nitromethane. |
