| 摘要 |
<p>It is intended to provide a transparent cellulose acylate film exhibiting a negative retardation value in the direction of film thickness industrially at low cost and to, by use thereof as a protective film for polarization plate, or retardation plate or support of retardation plate, provide an excellent liquid crystal display. There is provided a cellulose acylate film characterized in that the cellulose acylate film exhibits a retardation value of < 0 nm in the direction of film thickness, having an acyl substitution degree on cellulose hydroxyls satisfying all of the formulae 2.87 = SA+SP = 3 (A), 0 = SA = 1.7 (B) and 1.3 = SP = 2.9 (C) (in these formulae, SA and SP represent the degree of acyl substitution for cellulose hydroxyls, and SA is an acetyl substitution degree while SP is a propionyl substitution degree), and characterized in that the cellulose acylate film is derived from pulp.</p> |
