申请人:Nitto Denko Corporation
公开号:US08253899B2
公开(公告)日:2012-08-28
A birefringent film of the present invention comprises at least one kind of polycyclic compound including a —COOM group (the M denotes a counter ion), wherein an index ellipsoid satisfies a relation of nz>nx=ny. The polycyclic compound includes, for example, acenaphtho[1,2-b]quinoxaline derivative represented by the following general formula (I). The birefringent film of the present invention can be formed thin-type and have a high birefringent index in the thickness direction, since the birefringent film comprises the polycyclic compound.
本发明的双折射膜包括至少一种多环化合物,其中包括一个—COOM基团(M表示一个计数离子),其中一个指数椭球满足nz>nx=ny。多环化合物包括例如以下通式(I)所表示的蒽并并[1,2-b]喹啉衍生物。由于双折射膜包括多环化合物,因此可以形成薄型并具有高双折射指数的双折射膜。