Maximum absorption wavelength (max) briefly being

摘要

PROBLEM TO BE SOLVED: To exactly achieve objective optical characteristics of a cellulose ester film even when it is stretched at a low draw ratio. ;SOLUTION: A rod-shaped compound represented by formula (I): Ar¹-L¹-Ar² (wherein Ar¹ and Ar² are each independently an aromatic group; and L¹ is a divalent binding group selected from the group consisting of alkylene groups, alkenylene groups, alkynylene groups, divalent saturated heterocyclic groups, -O-, -CO- and combinations thereof) and having a maximum absorption wavelength (λmax) shorter then 250 nm in the ultraviolet absorption spectrum of its solution is added to a cellulose ester film.;COPYRIGHT: (C)2003,JPO