Patent ID: 7354632

Claim:
An optical laminate with a long size, comprising two obliquely stretched long phase-difference films being laminated together so that the respective delayed-phase axes thereof cross each other at a specified angle, at least one of the two phase-difference films being formed of a resin containing 10% by weight or more of a repeating unit having a tricyclo[4.3.0.1 2,5 ]decane-7,9-diyl-ethylene structure and/or a resin containing 55 to 90% by weight of a repeating unit-having a bicyclo[3.3.0]octane-2,4-diyl-ethylene structure, and containing a residual volatile component by not more than 1000 ppm, wherein said two phase-difference films being obliquely stretched at an angle of (45Â±5) degrees to the width direction, and being laminated together so that the respective delayed-phase axes thereof cross each other at an angle of (90Â±10) degrees, an intraplane refractive index in an arbitrary direction on each film being substantially the same with each other, and the refractive index being larger than the refractive index in the thickness direction.