| 摘要 |
PURPOSE:To improve crystallinity, preservable stability and workability by consisting the above material of mixed crystals composed of an urea deriv. and benzylidene aniline deriv. CONSTITUTION:The benzylidene aniline deriv. used in this optical material refers to a compd. which is introduced with a toner type group and acceptor type group at both terminals of the base skeleton. The urea deriv. contained in this material refers to a compd. in which at least one amino group hydrogen of urea is substd. with alkyl, hydroxy alkyl, halogen, etc. The urea deriv. has the poroperty to form an intermolecular hydrogen bond with the adjacent other molecular in the crystal, i.e., high hydrogen bond formability. Since the mol.wt. of this molecule is small, the density of the molecules having the optical nonlinearity and occupying per unit area is not lowered and, therefore, this material is effective for forming the mixed crystals. The crystallinity, preservable stability and workability are improved if the optical material is improved by the adoption of the mixed crystals mentioned above by using DNA, NPP, MNA, etc., with which the relatively large nonlinearity in the crystal state is reported. |
