US 9,347,003 B2 · Liquid crystal compound having tetrafluoropropenyl, liquid crystal composition, and liquid crystal display element

Abstract

A liquid crystal compound having high stability to heat and light, etc., a high clearing point, a low minimum temperature of liquid crystal phase, a low viscosity, a suitable optical anisotropy, a large dielectric anisotropy, a suitable elastic constant, and good compatibility with other liquid crystal compounds, a liquid crystal composition containing the compound, and a LCD element using the composition are described. The compound is represented by formula (1): wherein, for example, R1 is C1-10 alkyl, ring A1, ring A2, ring A3, ring A4 and ring B1 are independently 1,4-cyclohexylene, 1,4-phenylene, 1,4-phenylene in which at least one hydrogen is substituted with halogen, 1,3-dioxane-2,5-diyl, or tetrahydropyran-2,5-diyl, Z1, Z2, Z3 and Z4 are single bonds, l, m, n and o are independently 0 or 1, and l+m+n+o≧1.

Claims22

Dependent claims

A compound represented by formula (1):

wherein in formula (1),
R1 is C1-15 alkyl, and in the alkyl, at least one —CH2— is optionally replaced by —O— or —S—, at least one —(CH2)2— is optionally replaced by —CH═CH—, and at least one hydrogen is optionally substituted with halogen;
ring A1, ring A2, ring A3, ring A4 and ring B1 are independently 1,4-cyclohexylene, 1,4-phenylene, 1,4-phenylene in which at least one hydrogen is substituted with halogen, 1,3-dioxane-2,5-diyl, tetrahydropyran-2,5-diyl, pyrimidine-2,5-diyl, or pyridine-2,5-diyl;
Z1, Z2, Z3 and Z4 are independently a single bond, —(CH2)2—, —CH═CH—, —C≡C—, —COO—, —OCO—, —CF2O—, —OCF2—, —CH2O—, —OCH2—, or —CF═CF—;
and
l, m, n and o are independently 0 or 1, and l+m+n+o≧1.

3 more elements

Dependencies are inferred from the claim text.

Liquid crystal compound having tetrafluoropropenyl, liquid crystal composition, and liquid crystal display element

Life of this patent

Liquid crystal compound having tetrafluoropropenyl, liquid crystal composition, and liquid crystal display element

Life of this patent

Abstract

Claims22