Liquid crystal composition and liquid crystal display device

1. A liquid crystal composition having a negative dielectric anisotropy and comprising at least one compound represented by formula (1) as a first component, at least one compound represented by formula (2) as a second component, at least one compound represented by formula (4) as a third component, at least one compound represented by formula (5) as a fourth component, and at least one compound represented by formula (6) as a fifth component:

wherein R 1 is alkyl or alkenyl; R 2 is alkyl; R 3 is alkyl or alkoxy; R 4 is alkyl or alkoxymethyl; A 1 and A 2 are independently 1,4-cyclohexylene or 1,4-phenylene; A 3 is 1,4-cyclohexylene, 1,4-phenylene or 2-fluoro-1,4-phenylene; Z 1 is —CH 2 O— or —COO—; and Z 2 is a single bond or —COO—.

2. A liquid crystal composition having a negative dielectric anisotropy and comprising at least one compound represented by formula (1) as a first component, at least one compound represented by formula (2) and at least one compound represented by formula (3) as a second component, at least one compound represented by formula (4) as a third component, at least one compound represented by formula (5) as a fourth component, and at least one compound represented by formula (6) as a fifth component:

wherein R 1 is alkyl or alkenyl; R 2 is alkyl; R 3 is alkyl or alkoxy; R 4 is alkyl or alkoxymethyl; A 1 and A 2 are independently 1,4-cyclohexylene or 1,4-phenylene; A 3 is 1,4-cyclohexylene, 1,4-phenylene or 2-fluoro-1,4-phenylene; Z 1 is —CH 2 O— or —COO—; and Z 2 is a single bond or —COO—.

3. The liquid crystal composition according to claim 1 , wherein the composition comprises at least one compound selected from the group of compounds represented by formulas (4-1) to (4-5) as the third component, at least one compound selected from the group of compounds represented by formulas (5-2) as the fourth component, and at least one compound represented by formula (6-1) as the fifth component:

wherein R 2 and R 5 are independently alkyl; and R 6 is alkenyl.

4. The liquid crystal composition according to claim 2 , wherein the composition comprises at least one compound selected from the group of compounds represented by formulas (4-1) to (4-5) as the third component, at least one compound selected from the group of compounds represented by formulas (5-2) as the fourth component, and at least one compound represented by formula (6-1) as the fifth component:

wherein R 2 and R 5 are independently alkyl; and R 6 is alkenyl.

5. The liquid crystal composition according to claim 1 , wherein the first component is in a range of from approximately 15% to approximately 60% by weight, the second component is in a range of from approximately 5% to approximately 25% by weight, the third component is in a range of from approximately 5% to approximately 25% by weight, the fourth component is in a range of from approximately 5% to approximately 25% by weight, and the fifth component is in a range of from approximately 5% to approximately 30% by weight, based on the total weight of the liquid crystal compounds.

6. The liquid crystal composition according to claim 2 , wherein the first component is in a range of from approximately 15% to approximately 60% by weight, the second component is in a range of from approximately 5% to approximately 25% by weight, the third component is in a range of from approximately 5% to approximately 25% by weight, the fourth component is in a range of from approximately 5% to approximately 25% by weight, and the fifth component is in a range of from approximately 5% to approximately 30% by weight, based on the total weight of the liquid crystal compounds.

7. The liquid crystal composition according to claim 3 , wherein the first component is in a range of from approximately 15% to approximately 60% by weight, the second component is in a range of from approximately 5% to approximately 25% by weight, the third component is in a range of from approximately 5% to approximately 25% by weight, the fourth component is in a range of from approximately 5% to approximately 25% by weight, and the fifth component is in a range of from approximately 5% to approximately 30% by weight, based on the total weight of the liquid crystal compounds.

8. The liquid crystal composition according to claim 4 , wherein the first component is in a range of from approximately 15% to approximately 60% by weight, the second component is in a range of from approximately 5% to approximately 25% by weight, the third component is in a range of from approximately 5% to approximately 25% by weight, the fourth component is in a range of from approximately 5% to approximately 25% by weight, and the fifth component is in a range of from approximately 5% to approximately 30% by weight, based on the total weight of the liquid crystal compounds.

9. The liquid crystal composition according to claim 1 , wherein the composition further comprises an antioxidant.

10. The liquid crystal composition according to claim 2 , wherein the composition further comprises an antioxidant.

11. The liquid crystal composition according to claim 8 , wherein the composition further comprises an antioxidant.

12. The liquid crystal composition according to claim 9 , wherein the antioxidant is a compound represented by formula (8):

wherein m is an integer from 1 to 9.

13. The liquid crystal composition according to claim 10 , wherein the antioxidant is a compound represented by formula (8):

wherein m is an integer from 1 to 9.

14. The liquid crystal composition according to claim 11 , wherein the antioxidant is a compound represented by formula (8):

wherein m is an integer from 1 to 9.

15. The liquid crystal composition according to claim 12 , wherein the antioxidant is in a range of from approximately 50 ppm to approximately 600 ppm based on the total weight of the liquid crystal compounds.

16. The liquid crystal composition according to claim 13 , wherein the antioxidant is in a range of from approximately 50 ppm to approximately 600 ppm based on the total weight of the liquid crystal compounds.

17. The liquid crystal composition according to claim 14 , wherein the antioxidant is in a range of from approximately 50 ppm to approximately 600 ppm based on the total weight of the liquid crystal compounds.

18. A liquid display device comprising the liquid crystal composition according to claim 1 .

19. A liquid display device comprising the liquid crystal composition according to claim 2 .

20. A liquid display device comprising the liquid crystal composition according to claim 17 .

21. A composition having a negative dielectric anisotropy comprising

(a) a liquid crystal component consisting essentially of at least one compound represented by formula (1) as a first component, at least one compound represented by formula (2) as a second component, at least one compound represented by formula (4) as a third component, at least one compound represented by formula (5) as a fourth component, and at least one compound represented by formula (6) as a fifth component:

wherein R 1 is alkyl or alkenyl; R 2 is alkyl; R 3 is alkyl or alkoxy; R 4 is alkyl or alkoxymethyl; A 1 and A 2 are independently 1,4-cyclohexylene or 1,4-phenylene; A 3 is 1,4-cyclohexylene, 1,4-phenylene or 2-fluoro-1,4-phenylene; Z 1 is a single bond, —CH 2 O— or —COO—; and Z 2 is a single bond or —COO—; and

(b) at least one non-liquid crystal component.

22. A composition having a negative dielectric anisotropy comprising

(a) a liquid crystal component consisting essentially of at least one compound represented by formula (1) as a first component, at least one compound represented by formula (2) and at least one compound represented by formula (3) as a second component, at least one compound represented by formula (4) as a third component, at least one compound represented by formula (5) as a fourth component, and at least one compound represented by formula (6) as a fifth component:

wherein R 1 is alkyl or alkenyl; R 2 is alkyl; R 3 is alkyl or alkoxy; R 4 is alkyl or alkoxymethyl; A 1 and A 2 are independently 1,4-cyclohexylene or 1,4-phenylene; A 3 is 1,4-cyclohexylene, 1,4-phenylene or 2-fluoro-1,4-phenylene; Z 1 is a single bond, —CH 2 O— or —COO—; and Z 2 is a single bond or —COO—; and

(b) at least one non-liquid crystal component.

23. The liquid crystal composition according to claim 21 , wherein the liquid crystal component comprises at least one compound selected from the group of compounds represented by formulas (4-1) to (4-5) as the third component, at least one compound selected from the group of compounds represented by formulas (5-1) to (5-3) as the fourth component, and at least one compound represented by formula (6-1) as the fifth component:

wherein R 2 and R 5 are independently alkyl; and R 6 is alkenyl.

24. The liquid crystal composition according to claim 22 , wherein the liquid crystal component comprises at least one compound selected from the group of compounds represented by formulas (4-1) to (4-5) as the third component, at least one compound selected from the group of compounds represented by formulas (5-1) to (5-3) as the fourth component, and at least one compound represented by formula (6-1) as the fifth component:

wherein R 2 and R 5 are independently alkyl; and R 6 is alkenyl.

25. The liquid crystal composition according to claim 21 , wherein the liquid crystal component the first component is in a range of from approximately 15% to approximately 60% by weight, the second component is in a range of from approximately 5% to approximately 25% by weight, the third component is in a range of from approximately 5% to approximately 25% by weight, the fourth component is in a range of from approximately 5% to approximately 25% by weight, and the fifth component is in a range of from approximately 5% to approximately 30% by weight, based on the total weight of the liquid crystal compounds.

26. The liquid crystal composition according to claim 22 , wherein the liquid crystal component the first component is in a range of from approximately 15% to approximately 60% by weight, the second component is in a range of from approximately 5% to approximately 25% by weight, the third component is in a range of from approximately 5% to approximately 25% by weight, the fourth component is in a range of from approximately 5% to approximately 25% by weight, and the fifth component is in a range of from approximately 5% to approximately 30% by weight, based on the total weight of the liquid crystal compounds.

27. The liquid crystal composition according to claim 23 , wherein the liquid crystal component the first component is in a range of from approximately 15% to approximately 60% by weight, the second component is in a range of from approximately 5% to approximately 25% by weight, the third component is in a range of from approximately 5% to approximately 25% by weight, the fourth component is in a range of from approximately 5% to approximately 25% by weight, and the fifth component is in a range of from approximately 5% to approximately 30% by weight, based on the total weight of the liquid crystal compounds.

28. The liquid crystal composition according to claim 24 , wherein the liquid crystal component the first component is in a range of from approximately 15% to approximately 60% by weight, the second component is in a range of from approximately 5% to approximately 25% by weight, the third component is in a range of from approximately 5% to approximately 25% by weight, the fourth component is in a range of from approximately 5% to approximately 25% by weight, and the fifth component is in a range of from approximately 5% to approximately 30% by weight, based on the total weight of the liquid crystal compounds.

29. The liquid crystal composition according to claim 21 , wherein the at least one non-liquid crystal component comprises an antioxidant.

30. The liquid crystal composition according to claim 22 , wherein the at least one non-liquid crystal component comprises an antioxidant.

31. The liquid crystal composition according to claim 28 , wherein the at least one non-liquid crystal component comprises an antioxidant.

32. The liquid crystal composition according to claim 29 , wherein the antioxidant is a compound represented by formula (8):

wherein m is an integer from 1 to 9.

33. The liquid crystal composition according to claim 30 , wherein the antioxidant is a compound represented by formula (8):

wherein m is an integer from 1 to 9.

34. The liquid crystal composition according to claim 31 , wherein the antioxidant is a compound represented by formula (8):

wherein m is an integer from 1 to 9.

35. The liquid crystal composition according to claim 32 , wherein the antioxidant is in a range of from approximately 50 ppm to approximately 600 ppm based on the total weight of the liquid crystal compounds.

36. The liquid crystal composition according to claim 33 , wherein the antioxidant is in a range of from approximately 50 ppm to approximately 600 ppm based on the total weight of the liquid crystal compounds.

37. The liquid crystal composition according to claim 34 , wherein the antioxidant is in a range of from approximately 50 ppm to approximately 600 ppm based on the total weight of the liquid crystal compounds.

38. A liquid display device comprising the composition according to claim 11 .

39. A liquid display device comprising the composition according to claim 12 .

40. A liquid display device comprising the composition according to claim 37 .