Patent ID: 8101095

Claim:
The antiferroelectric mixture containing at least one achiral compound of general formula 1, wherein the lateral substituents X 1 , X 2 , X 3 , X 4 , X 5 , X 6 , X 7 and X 8 in the benzene rings represent independently hydrogen and fluorine atoms, Z is the single bond or COO or CH 2 CH 2 or CH 2 O or OCH 2 group, the substituent Y in the chain is CH 3 or C 2 H 5 or CH 2 F or CHF 2 or CF 3 group; symbols n, m, r and t are independently integers of 1 to 8; symbols p and s are independently 0 to 1 and at least one chiral compound (R or S enantiomer) of the said formula 1.