| abstract |
[PROBLEMS] To provide a novel optical laminate and a method for producing the same, which are more excellent in production efficiency, excellent in retardation controllability, have less variation, and can highly compensate for birefringence caused by a liquid crystal cell or the like as compared with conventional ones. To provide. A layer (B layer) containing a transparent resin as a main component is laminated on at least one surface of a layer (A layer) mainly containing a material having a negative intrinsic birefringence value. an optical laminate thickness D of the laminate, the wavelength of 550nm to the refractive index n z in the thickness direction measured with light, a 2 the refractive index in the direction orthogonal to the perpendicular to one another in the thickness direction n x , N y (where nx > ny ), wherein the following requirements (1) and (2) are satisfied. {Circle around (1)} nz > ( nx + ny ) / 2 ▲ 2 ▼ variations in (n x -n y) × plane retardation Re represented by D is within ± 10 nm. [Selection diagram] None |