| 摘要 |
<p>Disclosed is a thin and lightweight birefringent film having a refractive index ellipsoid satisfying the relation of nz > nx > ny. This birefringent film can be produced by a relatively simple process. Specifically disclosed is a birefringent film containing a acenaphto[1,2-b]quinoxaline derivative represented by the general formula (I) below and having a refractive index ellipsoid satisfying the relation of nz > nx > ny. In the formula (I) below, X, Y and Z independently represent a halogen atom, an alkoxy group, an-R group, an-OM group, a-COOM group, an-OCOR group, an-NHCOR group, a-CONHR group, an-NH2 group, an-NO2 group, a-CF3 group, a-CN group, an-OCN group, an-SCN group, an-SM group or a-PO3M group (wherein M represents a counter ion and R represents a hydrocarbon); and k, l, m and n each represents a number of substituents, namely k is an integer of 1-4, and l, m and n are independently an integer of 0-3.</p> |
