Nematic liquid crystal composition and liquid crystal display device using the same
A liquid crystal composition of the present invention is used for a liquid crystal display device of an active matrix driving mode which is required to have fast response. The liquid crystal composition has negative dielectric anisotropy, a large absolute value thereof, and low viscosity. Also, the liquid crystal composition has excellent liquid crystallinity that does not decrease Δn and T ni , and the like, and exhibits a stable liquid crystal phase within a wide temperature range. Further, the liquid crystal composition is chemically stable to heat, light, water, and the like and is thus suitable for use in a liquid crystal display device in which display defects are suppressed in large-size application requiring high reliability. A liquid crystal display device using the liquid crystal composition can be suitably used as a liquid crystal display device of a VA mode or the like.
1. A liquid crystal composition comprising, as a first component, 3 to 25% by mass of a compound represented by formula (I),
as a second component, 10 to 50% by mass of at least one compound selected from compounds represented by general formula (II),
wherein R 1 represents an alkenyl group having 2 to 10 carbon atoms or an alkenyloxy group having 2 to 10 carbon atoms, R 2 represents an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, or an alkenyloxy group having 2 to 10 carbon atoms, one —CH 2 — or nonadjacent two or more —CH 2 — present in R 1 and R 2 may be independently substituted by —O— and/or —S—, one or two or more hydrogen atoms present in R 1 and R 2 may be independently substituted by a fluorine atom or a chlorine atom, and p represents 0;
20% by mass or more of each of at least one compound selected from a compound group represented by general formulae (IV-1) to (IV-10),
wherein R 8 represents an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and R 9 represents an alkyl group having 1 to 5 carbon atoms, an alkoxyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkenyloxy group having 2 to 5 carbon atoms; and
0.01% by mass to 2% by mass of a polymerizable compound represented by general formula (V),
wherein R 10 and R 11 each independently represent any one of formula (R-1) to formula (R-15) below,
t represents 1 or 2, X 1 to X 8 each independently represent a trifluoromethyl group, a trifluoromethoxy group, a fluorine atom, or a hydrogen atom, and when t represents 2, a plurality of each of X 5 to X 8 may be the same or different.
wherein Δε at 25° C. is within a range of -2.0 to -6.0, refractive index anisotropy (Δn) at 25° C. is within range of 0.08 to 0.14, viscosity (η) at 20° C. is within a range of 10 to 30 mPa•s, and a nematic-isotropic liquid phase transition temperature (T ni ) is within a range of 60° C. 120° C.
2. The liquid crystal composition according to claim 1 , further comprising, as a third component, at least one compound represented by general formula (III),
(wherein R 3 represents an alkyl group having 1 to 10 carbon atoms or an alkoxy group having 1 to 10 carbon atoms, R 4 represents an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, or an alkenyloxy group having 2 to 10 carbon atoms, one —CH 2 — or nonadjacent two or more —CH 2 — present in R 3 and R 4 may be independently substituted by —O— and/or —S—, one or two or more hydrogen atoms present in R 3 and R 4 may be independently substituted by a fluorine atom or a chlorine atom, and q represents 0, 1, or 2).
3. The liquid crystal composition according to claim 2 , wherein a content of the third component is 5% to 50% by mass.
4. The liquid crystal composition according to claim 1 , comprising, as the second component, at least one compound selected from compounds represented by general formula (II-1) and general formula (II-2),
(R 5 represents an alkyl group having 1 to 10 carbon atoms).
5. The liquid crystal composition according to claim 2 , comprising, as the third component, at least one compound selected from compounds represented by general formula (III-1) and general formula (III-2),
(R 6 or R 7 represents an alkyl group having 1 to 10 carbon atoms).
6. The liquid crystal composition according to claim 5 , comprising the compound represented by the formula (I), at least one compound represented by the general formula (II-2), and at least one compound represented by the general formula (III-1).
7. The liquid crystal composition according to claim 5 , comprising the compound represented by the formula (I), at least one compound represented by the general formula (II-2), and at least one compound represented by the general formula (III-2).
8. The liquid crystal composition according to claim 5 , comprising the compound represented by the formula (I), at least one compound represented by the general formula (II-2), at least one compound represented by the general formula (III-1), and at least one compound represented by the general formula (III-2).
9. The liquid crystal composition according to claim 1 , wherein a content of a liquid crystal compound having an acetylene group is less than 10% by mass.
10. The liquid crystal composition according to claim 1 , comprising a polymerizable compound.
11. A liquid crystal display device comprising the liquid crystal composition according to claim 1 .
12. A liquid crystal display device for active matrix driving, comprising the liquid crystal composition according to claim 1 .
13. A liquid crystal display device for a VA mode, a PSA mode, a PSVA mode, an IPS mode, or an ECB mode, comprising the liquid crystal composition according to claim 1 .