Liquid crystal composition and liquid crystal display element
View Patent ↗A liquid crystal composition including three components, optionally four components, selected from the compounds (1-1) to (3-3) is provided. The composition has plural characteristics, i.e., a wide temperature range of a nematic phase, a low viscosity, a suitable optical anisotropy, and a large dielectric anisotropy, in a properly balanced manner. The invention further provides a liquid crystal display element including the composition.
1. A liquid crystal composition comprising at least one compound selected from the group of compounds represented by formulas (1-1), (1-2), and (1-3) as a first component, at least one compound selected from the group of compounds represented by formula (2) as a second component, and at least one compound selected from the group of compounds represented by formulas (3-1), (3-2), and (3-3) as a third component:
wherein, R 1 is alkyl; R 2 is alkyl or alkenyl in which one or more hydrogens may be replaced by fluorine; R 3 is alkyl or alkoxy; R 4 is alkyl or alkoxymethyl; R 5 is alkyl or alkenyl; A 1 is 1,4-cyclohexylene or 1,4-phenylene; Z 1 is a single bond or —COO—; X 1 and X 2 are independently hydrogen or fluorine; and Y 1 is fluorine or —OCF 3 .
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 formula (1-1).
3. 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 formula (1-1) and at least one compound selected from the group of compounds represented by formula (1-2).
4. 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 formula (1-1) and at least one compound selected from the group of compounds represented by formula (1-3).
5. 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 formula (1-1), at least one compound selected from the group of compounds represented by formula (1-2), and at least one compound selected from the group of compounds represented by formula (1-3).
6. 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 formula (1-2).
7. 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 formula (1-2) and at least one compound selected from the group of compounds represented by formula (1-3).
8. 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 formula (1-3).
9. The liquid crystal composition according to claim 1 which comprises from 5 to 50% by weight of the first component, from 5 to 40% by weight of the second component, and from 10 to 70% by weight of the third component, each based on the total weight of the composition.
10. The liquid crystal composition according to claim 1 which further comprises at least one compound selected from the group of compounds represented by formulas (4-1), (4-2), (4-3), and (44) as a fourth component:
wherein, R 1 is alkyl, R 5 is alkyl or alkoxy; R 5 is alkyl or alkenyl; A 2 is 1,4-cyclohexylene or 1,3-dioxane-2,5-diyl; A 3 is 1,4-cyclohexylene, 1,4-phenylene, 1,3-dioxane-2,5-diyl, or 3-fluoro-1,4-phenylene; A 4 is 1,4-cyclohexylene, 1,4-phenylene, or 3,5-difluoro-1,4-phenylene; A 5 is 1,4-cyclohexylene or 3-fluoro-1,4-phenylene; Z 1 is a single bond or —COO—; Z 2 is a single bond or —(CH 2 ) 2 —; Z 3 is a single bond, —COO—, —(CH 2 ) 2 —, or —CF 2 O—; Z 4 is a single bond, —COO—, or —(CH 2 ) 2 —; Y 1 is fluorine or —OCF 3 ; Y 2 is fluorine, chlorine, or —OCF 3 ; and n is 0 or 1.
11. The liquid crystal composition according to claim 9 which further comprises at least one compound selected from the group of compounds represented by formulas (4-1), (4-2), (4-3), and (4-4) as a fourth component:
wherein, R 1 is alkyl, R 5 is alkyl or alkoxy; R 5 is alkyl or alkenyl; A 2 is 1,4-cyclohexylene or 1,3-dioxane-2,5-diyl; A 3 is 1,4-cyclohexylene, 1,4-phenylene, 1,3-dioxane-2,5-diyl, or 3-fluoro-1,4-phenylene; A 4 is 1,4-cyclohexylene, 1,4-phenylene, or 3,5-difluoro-1,4-phenylene; A 5 is 1,4-cyclohexylene or 3-fluoro-1,4-phenylene; Z 1 is a single bond or —COO—; Z 2 is a single bond or —(CH 2 ) 2 —; Z 3 is a single bond, —COO—, —(CH 2 ) 2 —, or —CF 2 O—; Z 4 is a single bond, —COO—, or —(CH 2 ) 2 —; Y 1 is fluorine or —OCF 3 ; Y 2 is fluorine, chlorine, or —OCF 3 ; and n is 0 or 1.
12. The liquid crystal composition according to claim 10 which comprises from 1 to 50% by weight of the fourth component, based on the total weight of the composition.
13. The liquid crystal composition according to claim 11 which comprises from 1 to 60% by weight of the fourth component, based on the total weight of the composition.
14. A liquid crystal display element comprising the liquid crystal composition according to any one of claims 1 to 13 .
15. The liquid crystal display element according to claim 14 , wherein the liquid crystal display element is an AM element of an IPS mode.