A smectic liquid crystal mixture.

摘要

A smectic liquid crystal mixture comprising base substance(s) and exhibiting at least one of achiral SC phase and the like, and having at least one of SC phase and the like, which mixture is useful for ferroelectric liquid crystal materials having high-speed response and also has a low melting point and smectic C phase within a broad temperature range, and liquid crystal materials using the mixture are provided, which mixture comprises at least one member of pyridine compounds of the formula <CHEM> wherein R<1> and R<2> each are 1-18C alkyl and X is H or halogen, and at least one member of pyrimidine compounds of the formula <CHEM> wherein R<3> and R<4> each are 1-18C alkyl or alkoxy and <CHEM> is <CHEM>