Ferroelectric liquid crystal composition

Claim 1

A ferroelectric liquid crystal composition comprising at least one member selected from the group consisting of chiral compounds expressed by the following formulas (A-I) to (A-VI) and at least one member selected from the group consisting of compounds expressed by the following formulas (VII) to (XV) and having a spontaneous polarization value of 40 nC/cm 2 or more, the concentration of said at least one member of chiral compounds of the formulas (A-I) to (A-VI) used being 20 to 80% by weight and the concentration of said at least one member of compounds of the formulas (VII) to (XV) used being 5 to 50% by weight: ##STR79## wherein R 3 represents a linear or branched chain alkyl or alkoxy group each of 1 to 18 carbon atoms; n represents an integer of 2 to 5; and * indicates an asymmetric carbon: ##STR80## wherein R 4 represents a linear or branched chain alkyl or alkoxy group each of 1 to 18 carbon atoms; m represents an integer of 2 to 5; l represents 0 or 1; and * indicates an asymmetric carbon atom; ##STR81## wherein R 5 represents a linear or branched chain alkyl or alkoxy group each of 1 to 18 carbon atoms; k represents an integer of 2 to 5 carbon atoms; and * indicates an asymmetric carbon atom; ##STR82## wherein R 6 represents a linear or branched chain alkyl or alkoxy group each of 1 to 18 carbon atoms; j represents an integer of 0 to 5; and * indicates an asymmetric carbon atom; ##STR83## wherein R 7 represents a linear or branched chain alkyl or alkoxy group each of 1 to 18 carbon atoms; i represents an integer of 0 to 5 carbon atoms; and * indicates an asymmetric carbon atom; and ##STR84## wherein R 8 represents a linear or branched chain alkyl or alkoxy group each of 2 to 8 carbon atoms; R 9 represents a linear or branched chain alkyl or alkoxy group each of 1 to 18 carbon atoms; and * indicates an asymmetric carbon atom. ##STR85## wherein R 10 represents a linear or branched chain alkyl or alkoxy group each of 1 to 18 carbon atoms; X represents --H, --F or --CN; and * represents an asymmetric carbon atom; ##STR86## wherein R 11 represents a linear or branched chain alkyl or alkoxy group each of 1 to 18 carbon atoms; R 12 represents an alkyl group of 1 to 18 carbon atoms; and * indicates an asymmetric carbon atom; ##STR87## wherein R 13 represents a linear or branched chain alkyl or alkoxy group each of 1 to 18 carbon atoms; R 14 represents a linear or branched alkyl group of 2 to 18 carbon atoms or a linear or branched alkoxy group of 1 to 18 carbon atoms; and * indicates an asymmetric carbon atom; ##STR88## wherein R 15 represents a linear or branched chain alkyl or alkoxy group each of 1 to 18 carbon atoms; R 16 represents a linear chain alkyl group of 2 to 10 carbon atoms or a linear chain alkoxy group of 1 to 18 carbon atoms; and * represents an asymmetric carbon atom; ##STR89## wherein R 17 represents a linear or branched chain alkyl or alkoxy group each of 1 to 18 carbon atoms; R 18 represents a linear chain alkyl group of 2 to 18 carbon atoms or a linear or branched alkoxy group of 1 to 10 carbon atoms; and * indicates an asymmetric carbon atom; ##STR90## wherein R 19 represents a linear chain alkyl or alkoxy group each of 1 to 18 carbon atoms; R 20 represents a linear chain alkyl group of 1 to 18 carbon atoms of a linear chain alkoxy group of 1 to 18 carbon atoms; and * indicates an asymmetric carbon atom; ##STR91## wherein R 21 represents a linear or branched chain alkyl or alkoxy group of 1 to 18 carbon atoms; R 22 represents a linear or branched chain alkyl group of 2 to 18 carbon atoms or a linear or branched chain alkoxy group of 1 to 18 carbon atoms; and * represents an asymmetric carbon atom; ##STR92## wherein R 23 represents a linear or branched chain alkyl or alkoxy group each of 1 to 18 carbon atoms; and * indicates an asymmetric carbon atom; and ##STR93## wherein R 24 represents a linear or branched chain alkyl or alkoxy group each of 1 to 18 carbon atoms; and * indicates an asymmetric carbon atom.