Provide is a polar compound having high chemical stability, high capability of aligning liquid crystal molecules, high solubility in a liquid crystal composition, and a large voltage holding ratio when the compound is used in a liquid crystal display device. The problem is solved by a compound represented by formula (1).

##STR00001##

For example, R.sup.1 is alkyl having 1 to 15 carbons; rings A.sup.1 to A.sup.5 are cyclohexylene or phenylene; Z.sup.1, Z.sup.4 and Z.sup.5 are a single bond or alkylene having 1 to 10 carbons; a, b and c are 0 to 4; d and e are 1 to 4; P.sup.2 and P.sup.3 are a polymerizable group; and Sp.sup.2 and Sp.sup.3 are a single bond or alkylene having 1 to 10 carbons.

Provided are a polymerizable compound having at least one monovalent group (A), a polymerizable composition containing the polymerizable compound, a liquid crystal composite prepared from the polymerizable composition, and a liquid crystal device having the polymerizable composition.

##STR00001##

In monovalent group (A), R.sup.1 and R.sup.2 are independently hydrogen, halogen or alkyl having 1 to 20 carbons, and in the alkyl, at least one piece of CH.sub.2 may be replaced by O or S, and at least one piece of (CH.sub.2).sub.2 may be replaced by CHCH, and in the groups, at least one hydrogen may be replaced by halogen.

Provided is a liquid crystal composition, which comprises a component prepared from one or more compounds selected from a general formula I; and a component prepared from one or more compounds selected from a general formula II. The liquid crystal composition has the characteristics of low viscosity, high reliability, appropriate optical anisotropy, and appropriate dielectric anisotropy, and is applicable to liquid crystal display devices.

##STR00001##

The invention provides a liquid crystal compound satisfying at least one of physical properties such as a high stability to heat or light, a high clearing point (or a high maximum temperature), a low minimum temperature of a liquid crystal phase, a small viscosity, a suitable optical anisotropy, a small dielectric anisotropy, a suitable elastic constant and a good compatibility with other liquid crystal compounds, a liquid crystal composition including this compound, and a liquid crystal display device containing this composition. The invention provides a compound represented by formula (1): ##STR00001##
where R.sup.1 and R.sup.2 is alkyl having 1 to 20 carbons or the like; one of L.sup.1 and L.sup.2 is both hydrogens, and the other is both fluorines; Z.sup.1 and Z.sup.2 are independently a single bond, COO, OCO, OCH.sub.2, CH.sub.2O, CF.sub.2O, OCF.sub.2, CH.sub.2CH.sub.2, CHCH, CC or the like.

To provide a liquid crystal compound satisfying at least one of high stability to heat, light and so forth, a high clearing point, low minimum temperature of a liquid-crystal phase, small viscosity, suitable optical anisotropy, large dielectric anisotropy, a suitable elastic constant and excellent compatibility with other liquid-crystal compounds, a liquid crystal composition containing the compound and a liquid crystal display device including the composition. A compound is represented by formula (1-1). ##STR00001##
For example, R.sup.1 and R.sup.2 are independently hydrogen, alkyl having 1 to 10 carbons, alkenyl having 3 to 10 carbons and alkoxy having 1 to 9 carbons; ring A.sup.1 is 1,4-cyclohexylene; ring A.sup.2 and ring A.sup.3 are independently 1,4-cyclohexylene or 1,4-phenylene; Z.sup.1 is a single bond or (CH.sub.2).sub.2; l is 0 or 1, m and n are 0, 1 or 2, a sum: l+m+n is 0, 1 or 2; x is 0 or 1.

To provide a liquid crystal compound satisfying at least one of physical properties such as high stability to light, a high clearing point, a low minimum temperature of a liquid crystal phase, small viscosity, suitable optical anisotropy, large dielectric anisotropy, a large dielectric constant in a minor axis direction, a suitable elastic constant and excellent compatibility; a liquid crystal composition containing the compound; and a liquid crystal display device including the composition. The compound is represented by formula (1): ##STR00001##

Shown is a compound represented by formula (1). For example, R.sup.1 is alkyl having 1 to 15 carbons; MES is a mesogen group having at least one ring; Sp.sup.1 is a single bond or alkylene having 1 to 10 carbons; M.sup.1 is methyl; and R.sup.2, M.sup.2 and M.sup.3 are hydrogen.

##STR00001##

Provided is a liquid crystal compound satisfying at least one of physical properties such as high stability to heat and light, a high clearing point (or high maximum temperature), low minimum temperature of a liquid crystal phase, small viscosity, suitable optical anisotropy, large dielectric anisotropy, a suitable elastic constant and excellent compatibility with other liquid crystal compounds, a liquid crystal composition containing the compound and a liquid crystal display device including the composition. A compound, represented by formula (1): ##STR00001##
wherein, in formula (1), R.sup.1 is alkoxy having 1 to 9 carbons or the like; R.sup.2 is alkenyl having 2 to 10 carbons; Z.sup.1 and Z.sup.2 are independently a single bond, CH.sub.2CH.sub.2, CHCH or the like; and a and b are independently 0 or 1.

Provided are a compound having an effect on preventing photolysis of a liquid crystal composition, and high solubility in the liquid crystal composition, a liquid crystal composition containing the compound and a liquid crystal display device including the composition.

A compound is represented by formula (1), a liquid crystal composition contains the compound and a liquid crystal display device uses the composition.

##STR00001##

In formula (1), for example, R1 is alkyl having 1 to 10 carbons; R2 is hydrogen, hydroxy, oxy radical or alkyl; ring A1, ring A2 and ring A3 are independently 1,4-cyclohexylene, 1,4-phenylene or pyridine-2,5-diyl; Z1 and Z2 are independently a single bond or alkylene; and a and b are independently 0 or 1.

To show a liquid crystal compound satisfying at least one of physical properties such as a high stability to heat, light or the like, a high clearing point, a low minimum temperature of a liquid crystal phase, a small viscosity, a suitable optical anisotropy, a large dielectric anisotropy, a suitable elastic constant and an excellent compatibility with other liquid crystal compounds, a liquid crystal composition containing the compound and a liquid crystal display device including the composition. A compound represented by formula (1): ##STR00001## wherein, in formula (1), for example, R.sup.1 is alkyl having 1 to 15 carbons; ring A.sup.1 and ring A.sup.2 are 1,4-cyclohexylene, 1,4-cyclohexenylene, 1,4-phenylene, 1,4-phenylene in which at least one piece of hydrogen is replaced by halogen, tetrahydropyran-2,5-diyl or 1,3-dioxane-2,5-diyl; Z.sup.1 and Z.sup.2 are a single bond or CF.sub.2O; L.sup.1, L.sup.2 and L.sup.3 are halogen or hydrogen; and a is 0 to 3.