Ferroelectric chiral smectic liquid crystal composition and liquid crystal device using same

Claim 2

A ferroelectric chiral smectic liquid crystal composition, comprising: at least one compound represented by the following formula (I): wherein R, and R 2 respectively denote a linear or branched alkyl group having 1 - 18 carbon atoms capable of having a substituent; X 1 and X 2 respectively denote a single bond, -0-, Y 1 denotes -CH 2 0- or -OCH 2 -; and m and n are respectively 1 or 2; and at least one compound represented by the following formula (II); wherein R 3 denotes a linear or branched alkyl group having 1 - 18 carbon atoms capable of having a substituent; X 3 denotes a single bond, -0- or Z denotes a single bond or denotes and p is an integer of 1 - 12.

Claim 3

A composition according to Claim 1, which further comprises at least one compound represented by any of the following formulas (III) to (V); Formula (III): wherein R4 and Rs respectively denote a linear or branched alkyl group having 1 - 18 carbon atoms capable of having a substituent, at least one of R 4 and R s being optically active; X4 denotes a single bond, and Xs denotes a single bond, -0-, Formula (IV): wherein Rs and R 7 respectively denote a linear or branched alkyl group having 1 - 18 carbon atoms capable of having an alkoxy group of 1 - 12 carbon atoms; Xs and X 7 respectively denote a single bond, Formula (V): wherein R 8 and R 9 respectively denote a linear or branched alkyl group having 1 - 18 carbon atoms capable of having a substituent; Xs and Xs respectively denote a single bond, Y 2 denotes -CH 2 0-, -OCH2- or a single bond; and respectively denote and denotes with proviso that at least one of - or

Claim 4

A composition according to Claim 1 or 2, which further comprises a mesomorphic compound having a negative dielectric anisotropy.

Claim 5

A composition according to Claim 3, wherein said mesomorphic compound having a negative dielectric anisotropy has a dielectric anisotropy Δ∈ of below -2.

Claim 6

A composition according to Claim 4, wherein said mesomorphic compound having a negative dielectric anisotropy has a dielectric anisotropy Δe of below -5.

Claim 7

A composition according to Claim 5, wherein said mesomorphic compound having a negative dielectric anisotropy has a dielectric anisotropy Δe of below -10.

Claim 8

A composition according to Claim 3, wherein said mesomorphic compound having a negative dielectric anisotropy is a mesomorphic compound represented by any of the following formulas (VI-1) to (Vl-5); Formula (VI-1): wherein Ra and Rb respectively denote a linear or branched alkyl group capable of having a substituent; Xa and Xd respectively denote a single bond, -0-, - Xb and Xc respectively denote a single bond, or -CH 2 CH 2 -; Aa and Ab respectively denote a single bond, (trans-trans), trans) or with proviso that when Aa and Ab are both single bonds, Xb and Xc are both single bonds, and Xa and Xd are both single bonds or -0-, or Xa is and Xd is and Ya and Yb are respectively cyano group, halogen or hydrogen with proviso that Ya and Yb cannot be hydrogen simultaneously; Formula (VI-2): wherein Re and Rf respectively denote a linear or branched alkyl group capable of having a substituent; Xe and Xh are respectively a single bond, -0-, Xf and Xg are respectively or a single bond; and Ae and Af are respectively or a single bond with proviso that Ae and Af cannot be a single bond simultaneously; Formula (VI-3): wherein Ai is a single bond or Aj is a single bond, Ri and Rj are respectively a linear or branched alkyl group capable of having a substituent with proviso that Ri and Rj are linear alkyl groups when Aj is a single bond; Z 1 is -0- or -S-; Xi and Xk are respectively a single bond, -0-, Xj is a single bond, -CH 2 0- or -OCH 2 - with proviso that Xi is a single bond when Ai is a single bond, Xj is not a single bond when Aj is and Xk is a single bond when Aj is a single bond; Formula (VI-4): wherein RI and Rm are respectively a linear or branched alkyl group capable of having a substituent; AI and Am are respectively a single bond, with proviso that AI and Am cannot be a single bond simultaneously; XI is a single bond, -O-, or and Xm is a single bond, Formula (VI-5): wherein Rn and Ro are respectively a linear or branched alkyl group capable of having a substituent; Xn and Xq are respectively a single bond, -O-, Xo and Xp are respectively a single bond, -CH 2 0-, -OCH 2 - or -CH 2 CH 2 -; An and Ap are respectively a single bond, and Z 2 is or

Claim 9

A liquid crystal device, comprising a pair of electrode plates and a ferroelectric liquid crystal composition according to any one of Claims 1 - 7 disposed between the electrode plates.