| 摘要 |
A method of manufacturing an optical film using a solution casting method comprising the steps of: (i) preparing an initial dope comprising a cellulose ester resin; (ii) preparing a casting dope by diluting the initial dope with a diluting solution via inline dilution, the diluting solution having a solid content lower than a solid content of the initial dope; and (iii) casting the casting dope to form a cellulose ester film, wherein (a) an average orientation angle of the slow axis is 90°±1.5° or 0°±1.5° against a film transport direction of the cellulose ester film; and (b) a fluctuation of a viscosity or a fluctuation of a density of the casting dope is controlled so that a relative standard deviation of the fluctuation of the viscosity or the fluctuation of the density of the casting dope is in the range of 0.01-1%.
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