| 摘要 |
PURPOSE: A cellulose acrylate film is provided to have reverse dispersion property, large Rth per film thickness, and uniform display in plane when attached to a panel after processing a polarizer. CONSTITUTION: A cellulose acrylate film comprises cellulose acrylate with the total acyl substitution degree of 2.1-2.8. The elastic modulus of a film-return direction is 3200 MPa or more. The deviation of the elastic modulus of the film-return direction is 0.5 GPa or less, and satisfies equation 1: 0 nm <= ΔRe <= 15.0 nm, equation 2: 2×10^(-3) <= Rth/d <= 6×10^(-3), and equation 3: 1.0 <= E'(TD)/E'(MD) <= 1.43. In equation 1, ΔRe is a value which subtracts inner plane retardation value at 450 nm from the retardation value of inner plane direction at 630 nm. In equation 2, Rth is a retardation value of film thickness direction at 550 nm, and d is film thickness.
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