METHOD FOR PRODUCING CELLULOSE ACYLATE FILM

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PROBLEM TO BE SOLVED : To provide a method for producing stably and rapidly a cellulose acylate film that is substantially optically isotropic, moreover whose optical anisotropy is small in wavelength dispersion. SOLUTION : This method for producing the cellulose acylate film satisfies the formula (I) and (II), and comprises a first process to dissolve a cellulose acylate as a raw material roughly in a solvent and a second process to prepare a dope by accelerating dissolution of the solution, that is roughly dissolved in the first process, while supplying the solution. Formula (I) : 0≤Re(630)≤10, and |Rth(630)|≤25; Formula (II) : |Re(400)-Re(700)|≤10, and |Rth(400)-Rth(700)|≤35, wherein, Re(λ) is a frontal retardation value (unit : nm) at a wavelength λ nm, Rth(λ) is a retardation value (unit : nm) in a film thickness direction at a wavelength λ nm. COPYRIGHT : (C)2006, JPO&NCIPI