US 5,702,641 A · Liquid crystalline compound containing fluorine atom substituted alkyl group(s) and a liquid crystal composition

Abstract

A liquid crystalline compound exhibiting a large .DELTA..epsilon. value, an electrical and chemical stability and a superior compatibility with existing liquid crystalline compounds, a liquid crystal composition containing the same, and a liquid crystal display element constructed by using the composition are provided, which liquid crystalline compound is expressed by the formula (I), F--(CH.sub.2)n-E--(CH.sub.2 CH.sub.2).sub.k --G--(CH.sub.2 CH.sub.2).sub.l --L--(CH.sub.2 CH.sub.2).sub.m --Z--Q--Y (I) wherein n is an integer of 1 to 10; k, l and m each independently are an integer of 0 to 2; ring E is 1,4-cyclohexylene group or 1,4-phenylene group, wherein one or more H atoms on each six-membered ring may be replaced by F atom(s); G and L each independently is a covalent bond or 1,4-cyclohexylene group or 1,4-phenylene group, wherein one or more H atoms on each six-membered ring may be replaced by F atom(s); Q is covalent bond or --O--; Y is a fluoroalkyl group of 1 to 3C or F atom; but in the case where ring E is 1,4-cyclohexylene group and at least one of G and L is covalent bond, k+l+m.noteq.0, and in the case where Q is --O--, Y is not F atom.

Claims20

Dependent claims

A liquid crystalline compound expressed by the formula (I):

F--(CH.sub.2)n-E--(CH.sub.2 CH.sub.2).sub.k --G--(CH.sub.2 CH.sub.2).sub.m --L--(CH.sub.2 CH.sub.2).sub.m --Z--Q--Y (I)
wherein n represents an integer of 1 to 10;
k, l and m each independently represent an integer of 0 to 2;
E represents 1,4-cyclohexylene group or 1,4-phenylene group wherein one or more hydrogen atoms on a six-membered ring may be replaced by fluorine atom(s);
G and L each independently represent a covalent bond or 1,4-cyclohexylene group or 1,4-phenylene group wherein one or more hydrogen atoms may be replaced by fluorine atom(s), provided that when only one of G or L is a covalent bond, G is the covalent bond;
Z represents 1,4-phenylene group wherein one or more hydrogen atoms on the 1,4-phenylene group may be replaced by fluorine atom(s);
Q represents a covalent bond or --O--;
Y represents a fluoroalkyl group of 1 to 3 carbon atoms or fluorine atom;
and when E represents 1,4-cyclohexylene group and at least one of G and L represents a covalent bond, k+l+m.noteq.0 and when Q represents --O--, Y does not represent fluorine atom.

6 more elements

A liquid crystalline compound expressed by the formula (I):

F--(CH.sub.2)n-E(CH.sub.2 CH.sub.2).sub.k --G--(CH.sub.2 CH.sub.2).sub.l --L--(CH.sub.2 CH.sub.2).sub.m --Z--Q--Y (I)
wherein n represents an integer of 1 to 10;
k and m each represent the integer 1, and l represents 0;
E represents 1,4-cyclohexylene group wherein one or more hydrogen atoms on the cyclohexylene ring may be replaced by fluorine atom(s);
G represents a covalent bond;
L represents 1,4-cyclohexylene group wherein one or more hydrogen atoms on the cyclohexylene ring may be replaced by fluorine atom(s), or L represents fluorine-substituted 1,4-phenylene group;
Z represents 1,4-phenylene group wherein one or more hydrogen atoms on the 1,4-phenylene group may be replaced by fluorine atom(s);
Q represents a covalent bond or --O--;
Y represents a fluoroalkyl group of 1 to 3 carbon atoms or fluorine atom;
k+l+m.noteq.0;
and when Q represents --O--, Y does not represent fluorine atom.

8 more elements

Dependencies are inferred from the claim text.

Liquid crystalline compound containing fluorine atom substituted alkyl group(s) and a liquid crystal composition

Life of this patent

Liquid crystalline compound containing fluorine atom substituted alkyl group(s) and a liquid crystal composition

Life of this patent

Abstract

Claims20