| 摘要 |
An optical cellulose acylate film comprising a polymer component which is a cellulose acylate obtained by substituting hydroxyl groups of a cellulose by an acetyl group and an acyl group having 3 or more carbon atoms, wherein a substitution degree A of the acetyl group and a substitution degree B of the acyl group having 3 or more carbon atoms satisfy the following formulae (I) and (II): 2.0<=A+B<=3.0 (I), 0<B (II), and the optical cellulose acylate film comprises a retardation-expressing agent which is at least one of a rod-like compound and a discotic compound or an elastic modulus E(MD) in a casting direction and an elastic modulus E(TD) in a casting width direction satisfy the following formulae (III) and (IV): 1,500 MPa<=E(MD)<=3,400 Mpa (III) and 1,200 MPa<=E(TD)<=3,400 Mpa (IV).
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