A manufacturing method of a cellulose acylate

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PROBLEM TO BE SOLVED : To provide a cellulose acylate film wherein retardation at the whole visual range is small, substantially an optical isotropy is attained, a wavelength dispersion is small and an axial dispersion is small, and also to provide a retardation film in which angular field of view properties upon installed in a liquid crystal display device is excellent and further to provide a polarized plate using the same and a liquid crystal display device having an excellent angular field of view. SOLUTION : In the cellulose acylate film, Re(λ) and Rth(λ) satisfy (I)0≤Re(590)≤10 and ¾Rth(590)¾≤25, and (II) ¾Re(400)-Re(700)¾≤10 and ¾Rth(400)-Rth(700)¾≤35 and a slow phase axial direction is 0°±10° or 90°±10° in a film longitudinal direction, wherein the units of Re(λ) and Rth(λ) are nm. COPYRIGHT : (C)2006, JPO&NCIPI