Cellulose acylate film, optical compensation film, polarizing plate and liquid crystal display

A cellulose acylate film having an elasticity modulus of 4,800 MPa to 10,000 MPa in at least one direction of a machine direction MD in producing of the cellulose acylate film and a transverse direction TD perpendicular to the machine direction, the cellulose acylate film having an in-plane retardation Re(λ) satisfying Expression:

• 20 nm ≦Re(590)≦200 nm and a thickness-direction retardation Rth(λ) satisfying Expression:
• 70 nm≦Rth(590)≦350 nm, and the cellulose acylate film having a thickness of 40 μm to 150 μm;
• wherein the cellulose acylate film comprises mixed fatty acid ester of cellulose, wherein a hydroxyl group of the cellulose is substituted by an acetyl group, another hydroxyl group of the cellulose is substituted by an acyl group having 3 or more carbon atoms, and the cellulose acylate film satisfies Expressions (I) and (II):
• 2.0≦A+B≦3.0 (I)
• 0<B (II)
• wherein A represents a substitution degree of the acetyl group, and B represents a substitution degree of the acyl group having 3 or more carbon atoms;
• and wherein the mixed fatty acid ester of cellulose is a cellulose acylate comprising a glucose unit, wherein a hydroxyl group of the glucose unit is substituted by the acetyl group or the acyl group having 3 or more carbon atoms, and the cellulose acylate film satisfies Expressions (III) and (IV):
• 2.0≦DS2≦DS3≦DS6≦2.85 (III)
• DS6/(DS2+DS3DS6)≧0.315 (IV)
• wherein DS2 represents a substitution degree of the acyl group for a 2-position hydroxyl group of the glucose unit, DS3 a substitution degree of the acyl group for a 3- position hydroxyl group of the glucose unit, and DS6 a substitution degree of the acyl group for a 6-position hydroxyl group of the glucose unit.