| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a norbornene polymer film whose retardation has reverse wavelength dispersion characteristics. <P>SOLUTION: The film is comprised of a norbornene polymer containing a recurring unit represented by general formula (I). In the formula, R<SP>1</SP>and R<SP>2</SP>are each a hydrogen atom, an optionally substituted alkyl group or an optionally substituted aryl group; L and L' are each a bivalent linking group or a single bond; and A and A' are each an aromatic group. <P>COPYRIGHT: (C)2008,JPO&INPIT |
