Liquid crystal composition and liquid crystal display device
View Patent ↗A liquid crystal composition having a nematic phase that includes two components, wherein the first component is at least one compound selected from the group of compounds represented by formulas (1-1) to (1-3), and the second component is at least one compound selected from the group of compounds represented by formula (2): wherein R 1 is alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons or alkenyl having 2 to 12 carbons; R 2 and R 3 are each independently alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons, alkenyl having 2 to 12 carbons or alkenyl having 2 to 12 carbons in which arbitrary hydrogen is replaced by fluorine; ring A, ring B and ring C are each independently 1,4-cyclohexylene, 1,4-phenylene or 2-fluoro-1,4-phenylene, 2,5-difluoro-1,4-phenylene; Z 1 and Z 2 are each independently a single bond, ethylene, carbonyloxy or difluoromethyleneoxy, provided that at least one of Z 1 and Z 2 is difluoromethyleneoxy; Z 3 and Z 4 are each independently a single bond, ethylene or carbonyloxy; X 1 , X 2 , X 3 , X 4 , X 5 , X 6 , X 7 and X 8 are each independently hydrogen or fluorine; Y 1 is fluorine, chlorine or trifluoromethoxy; and m is 0, 1 or 2.
1. A liquid crystal composition having a nematic phase comprising two components, wherein the first component is at least one compound selected from the group of compounds represented by formulas (1-1) to (1-3), and the second component is at least one compound selected from the group of compounds represented by formula (2):
wherein R 1 is alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons or alkenyl having 2 to 12 carbons; R 2 and R 3 are each independently alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons, alkenyl having 2 to 12 carbons or alkenyl having 2 to 12 carbons in which arbitrary hydrogen is replaced by fluorine; ring A, ring B and ring C are each independently 1,4-cyclohexylene, 1,4-phenylene or 2-fluoro-1,4-phenylene, or 2,5-difluoro-1,4-phenylene; Z 1 and Z 2 are each independently a single bond, ethylene, carbonyloxy or difluoromethyleneoxy, provided that at least one of Z 1 and Z 2 is difluoromethyleneoxy; Z 3 and Z 4 are each independently a single bond, ethylene or carbonyloxy; X 1 , X2, X 3 , X 4 , X 5 , X 6 , X 7 and X 8 are each independently hydrogen or fluorine; Y 1 is fluorine, chlorine or trifluoromethoxy; and m is 0, 1 or 2.
2. The liquid crystal composition according to claim 1 , wherein the first component is at least one compound selected from the group of compounds represented by formulas (1-1-1), (1-1-2), (1-2-1), (1-2-2), (1-3-1) and (1-3-2):
wherein R 1 is alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons or alkenyl having 2 to 12 carbons; X 1 , X 2 , X 3 , X 4 , X 5 , X 6 , X 7 and X 8 are each independently hydrogen or fluorine; and Y 1 is fluorine, chlorine or trifluoromethoxy.
3. The liquid crystal composition according to claim 2 , wherein the first component is at least one compound selected from the group of compounds represented by formula (1-1-1).
4. The liquid crystal composition according to claim 2 , wherein the first component is at least one compound selected from the group of compounds represented by formula (1-1-2).
5. The liquid crystal composition according to claim 1 , wherein the second component is at least one compound selected from the group of compounds represented by formulas (2-1) to (2-10):
wherein R 2 and R 3 are each independently alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons, alkenyl having 2 to 12 carbons or alkenyl having 2 to 12 carbons in which arbitrary hydrogen is replaced by fluorine.
6. The liquid crystal composition according to claim 5 , wherein the second component is at least one compound selected from the group of compounds represented by formula (2-1).
7. The liquid crystal composition according to claim 5 , wherein the second component is a mixture of at least one compound selected from the group of compounds represented by formula (2-1) and at least one compound selected from the group of compounds represented by formula (2-4).
8. The liquid crystal composition according to claim 5 , wherein the second component is a mixture of at least one compound selected from the group of compounds represented by formula (2-1) and at least one compound selected from the group of compounds represented by formula (2-6).
9. The liquid crystal composition according to claim 5 , wherein the second component is a mixture of at least one compound selected from the group of compounds represented by formula (2-6) and at least one compound selected from the group of compounds represented by formula (2-10).
10. The liquid crystal composition according to claim 5 , wherein the second component is a mixture of at least one compound selected from the group of compounds represented by formula (2-1), at least one compound selected from the group of compounds represented by formula (2-4) and at least one compound selected from the group of compounds represented by formula (2-6).
11. The liquid crystal composition according to claim 1 , wherein a ratio of the first component is from approximately 5% by weight to approximately 30% by weight, and a ratio of the second component is from approximately 35% by weight to approximately 85% by weight, based on the total weight of the liquid crystal composition.
12. The liquid crystal composition according to claim 1 , wherein the composition further comprises at least one compound selected from the group of compounds represented by formula (3) as a third component:
wherein R 1 is alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons or alkenyl having 2 to 12 carbons; ring D is independently 1,4-cyclohexylene, 1,3-dioxan-2,5-diyl, 1,4-phenylene, 2-fluoro-1,4-phenylene, 2,6-difluoro-1,4-phenylene or 2,5-pyrimidine; Z 1 is independently a single bond, ethylene, carbonyloxy or difluoromethyleneoxy; X 1 and X 2 are each independently hydrogen or fluorine; Y 1 is fluorine, chlorine or trifluoromethoxy; and n is 1, 2 or 3.
13. The liquid crystal composition according to claim 12 , wherein the third component is at least one compound selected from the group of compounds represented by formulas (3-1) to (3-17):
wherein R 4 is alkyl having 1 to 12 carbons or alkenyl having 2 to 12 carbons.
14. The liquid crystal composition according to claim 13 , wherein the third component is at least one compound selected from the group of compounds represented by formulas (3-9).
15. The liquid crystal composition according to claim 13 , wherein the third component is at least one compound selected from the group of compounds represented by formulas (3-10).
16. The liquid crystal composition according to claim 13 , wherein the third component is at least one compound selected from the group of compounds represented by formulas (3-11).
17. The liquid crystal composition according to claim 13 , wherein the third component is at least one compound selected from the group of compounds represented by formulas (3-17).
18. The liquid crystal composition according to claim 13 , wherein the third component is a mixture of at least one compound selected from the group of compounds represented by formulas (3-6) and at least one compound selected from the group of compounds represented by formulas (3-11).
19. The liquid crystal composition according to claim 13 , wherein the third component is a mixture of at least one compound selected from the group of compounds represented by formulas (3-9) and at least one compound selected from the group of compounds represented by formulas (3-11).
20. The liquid crystal composition according to claim 13 , wherein the third component is a mixture of at least one compound selected from the group of compounds represented by formulas (3-11) and at least one compound selected from the group of compounds represented by formulas (3-17).
21. The liquid crystal composition according to claim 12 , wherein a ratio of the third component is from approximately 5% by weight to approximately 60% by weight based on the total weight of the liquid crystal composition.
22. The liquid crystal composition according to claim 1 , wherein the composition has a maximum temperature of a nematic phase of approximately 70° C. or more, an optical anisotropy (25° C.) at a wavelength of 589 nm of approximately 0.08 or more, and a dielectric anisotropy (25° C.) at a frequency of 1 kHz of approximately 2 or more.
23. A liquid display device that includes the liquid crystal composition according to claim 1 .
24. The liquid crystal display device according to claim 23 , wherein the liquid crystal display device has an operation mode of a TN mode, an OCB mode or an IPS mode, and has a driving mode of an active matrix mode.
25. The liquid crystal display device according to claim 23 , wherein the liquid crystal display device has an operation mode of a PSA mode, and has a driving mode of an active matrix mode.