LIQUID CRYSTAL RACEMIC MIXTURE, LIQUID CRYSTAL COMPOSITION AND LIQUID CRYSTAL ELEMENT, PROCESS FOR MANUFACTURING LIQUID CRYSTAL ELEMENT,AND USES OF LIQUID CRYSTAL ELEMENT

摘要

The liquid crystal racemic mixture of the invention is represented by the formula (I): (see formula I) wherein R1 is a specific group of alkyl, alkoxy or halogenated alkyl, X and Y are either one of the following group:-COO-, -OCO-, -CH2CH2-, -CH2O-, -OCH2-, -COCH2-, -CH2CO- and -S-S -, or a single bond, A and B are each a specific bivalent group such as 1,4-phenylene group, Z is a group selected from the group consisting of (see formula II) and (see formula III) (wherein R2 is an alkyl group, an alkoxy group or a halogenated alkyl group), and m and n are an integer of 0 to 2 (m and n not being simultaneously 0). The liquid crystal composition of the invention comprises the racemic mixture as described above. Moreover, the liquid crystal element of the invention comprises a liquid crystal material containing the liquid crystal racemic mixture as described above.