US 2002/0119260 A1 · Liquid crystalline compound having difluoropropyleneoxy group as bonding group, liquid crystal composition and liquid crystal display element

Abstract

The present invention provides a liquid crystalline compound having a difluoropropyleneoxy group as a bonding group, which is represented by Formula (1): 1 wherein R1 and R2 each independently represent hydrogen, halogen, a cyano group or an alkyl group having 1 to 20 carbon atoms; rings A1 to A5 each independently represent a 1,4-cyclohexylene group, a 1,4-cyclohexenylene group or a 1,4-phenylene group; Z1 to Z4 each independently represent a single bond, —CH2CH2—, —CH213 , —OCH2—, —COO—, —OCO—, —CH=CH—, —C—C—, —CF2O— or —OCF2—; Y1, Y2, Y3 and Y4 each independently represent hydrogen or fluorine; and k, l, m and n each independently represent 0 or 1. This liquid crystalline compound has a large absolute value (|Δε|) of a dielectric anisotropy and shows a relatively small refractive anisotropy. The present invention further provides a liquid crystal composition comprising this compound which makes it possible to drive display elements of various modes at a low voltage, and a liquid crystal display element containing this liquid crystal composition.

Claims24

Dependent claims

A liquid crystalline compound represented by Formula (1):

240
wherein R1 and R2 each independently represent hydrogen, halogen, a cyano group or an alkyl group having 1 to 20 carbon atoms, in which at least one —CH2— may be substituted with —CH═CH—, —C═C—, —O— or —S— but —O— is not adjacent to another —O—, and in which at least one hydrogen may be substituted with halogen;
rings Al to A5 each independently represent a 1,4-cyclohexylene group in which at least one —CH2— not adjacent to each other may be substituted with —O— or —S—, a 1,4-cyclohexenylene group, or a 1,4-phenylene group in which at least one =CH— may be substituted with =N— and hydrogen on the ring may be substituted with halogen;
Z1 to Z4 each independently represent a single bond, —CH2CH2—, —CH2O—, —OCH2—, —COO—, —OCO—, —CH═CH—, —C≡C—, —CF2O— or —OCF2—;
Y1, Y2 , Y3 and Y4 each independently represent hydrogen or fluorine;
and k, l, m and n each independently represent 0 or 1.

3 more elements

Dependencies are inferred from the claim text.

Liquid crystalline compound having difluoropropyleneoxy group as bonding group, liquid crystal composition and liquid crystal display element

Life of this patent

Liquid crystalline compound having difluoropropyleneoxy group as bonding group, liquid crystal composition and liquid crystal display element

Life of this patent

Abstract

Claims24