Patent ID: 6246452
Filing Date: 2001-06-12
Classification: C09K

Abstract:
A ferroelectric chiral smectic liquid crystal mixture comprisingat least one compound of the formula (I): ##STR163##wherein R.sub.11 and R.sub.12 represent, independently each other, a C.sub.1 -C.sub.20 alkyl, alkoxy or alkoxyalkyl group which may be substituted by at least one halogen atom and may have an unsaturated bond; A.sub.11, A.sub.12 and A.sub.13 represent, independently each other, a condensed ring or monocyclic group of the formula: ##STR164##in which i is an integer of 0 to 4 and j and k are each an integer of 0 to 3; p and q are each 0 or 1, provided that when A.sub.11 is a condensed ring group, a sum of p and q is 0 or 1 and A.sub.12 and A.sub.13 are monocyclic groups, or when A.sub.11 is a monocyclic group, a sum of p and q is 1 or 2, with the proviso that when the sum of p and q is 2, A.sub.12 and A.sub.13 are both monocyclic groups; * indicates an asymmetric carbon atom; Z is a hydrogen atom or a fluorine atom; n is an integer of 0 to 10; r, s, t and u are each 0 or 1, provided that when u is 1, the compound (I) is a trans-olefin, andat least one compound of the formula (II): ##STR165##wherein R.sub.21 is a saturated or unsaturated C.sub.3 -C.sub.20 alkyl group or a saturated or unsaturated C.sub.3 -C.sub.20 alkoxyalkyl group; A.sub.21, A.sub.22 and A.sub.23 represent, independently each other, a group of the formula: ##STR166##in which i, j and k are the same as defined above; p and q are each 0 or 1, provided that when A.sub.21 is a condensed ring group, a sum of p and q is 0 or 1 and A.sub.21 and A.sub.23 are monocyclic groups, or when A.sub.21 is a monocyclic group, the sum of p and q is 1 or 2, with the proviso that when the sum of p and q is 2, A.sub.22 and A.sub.23 are both monocyclic groups; X.sub.2 is --C.tbd.C--, --HC.dbd.CH-- or --CH.sub.2 --CH.sub.2 --; Z is a hydrogen atom or a fluorine atom; n is an integer of 1 to 10; m is 0 or 1; and * indicates an asymmetric carbon atom.