LIQUID CRYSTAL COMPOSITION AND LIQUID CRYSTAL DISPLAY DEVICE

• US 20120261614A1
• Filed: 04/12/2012
• Published: 10/18/2012
• Est. Priority Date: 04/18/2011
• Status: Active Grant

• Current Assignee: JNC Corporation (Chisso Corporation), JNC Petrochemical Corporation (Chisso Corporation)
• Original Assignee: JNC Corporation (Chisso Corporation), JNC Petrochemical Corporation (Chisso Corporation)
• Inventors: GOTO, YASUYUKI, HATTORI, NORIKATSU, KAWASAKI, SUBARU
• Granted Patent: US 8,637,125 B2
• Time in Patent Office: Days
• US Class Current: 252/299.61
• CPC Class Codes: C07C 22/00 Cyclic compounds containing halogen atoms bound to an acyclic carbon atom
• CPC Class Codes: C07C 25/18 Polycyclic aromatic halogenated hydrocarbons
• CPC Class Codes: C09K 19/3066 in which the rings are linked by a chain containing carbon and oxygen atoms, e.g. esters or ethers
• CPC Class Codes: C09K 19/44 containing compounds with benzene rings directly linked
• CPC Class Codes: C09K 2019/0407 containing a carbocyclic ring, e.g. dicyano-benzene, chlorofluoro-benzene or cyclohexanone
• CPC Class Codes: C09K 2019/0411 containing a chlorofluoro-benzene, e.g. 2-chloro-3-fluoro-phenylene-1,4-diyl
• CPC Class Codes: C09K 2019/0444 characterized by a linking chain between rings or ring systems, a bridging chain between extensive mesogenic moieties or an end chain group
• CPC Class Codes: C09K 2019/123 Ph-Ph-Ph
• CPC Class Codes: C09K 2019/3004 Cy-Cy
• CPC Class Codes: C09K 2019/3009 Cy-Ph
• CPC Class Codes: C09K 2019/3016 Cy-Ph-Ph
• CPC Class Codes: C09K 2019/3036 Cy-C2H4-Ph
• CPC Class Codes: C09K 2019/3422 the heterocyclic ring being a six-membered ring
• CPC Class Codes: C09K 2019/3425 Six-membered ring with oxygen(s) in fused, bridged or spiro ring systems
• CPC Class Codes: C09K 2323/00 Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition

Abstract

Providing a liquid crystal composition satisfying at least one of characteristics such as high maximum temperature of nematic phase, low minimum temperature of the nematic phase, small viscosity, suitable optical anisotropy, large negative dielectric anisotropy, large specific resistance, high stability to ultraviolet light and heat, or having a suitable balance regarding at least two of the characteristics; and an AM device having short response time, large voltage holding ratio, large contrast ratio, long service life and so forth. The liquid crystal composition has a negative dielectric anisotropy and contains a specific two-ring compound having a low minimum temperature as a first component, a specific compound having a large negative dielectric anisotropy as a second component, a specific compound having a low viscosity as a third component, and a specific compound having a large negative dielectric anisotropy as a fourth component. The liquid crystal display device contains the composition.

Claims

1. A liquid crystal composition that has a negative dielectric anisotropy and contains at least one compound selected from the group of compounds represented by formula (1) as a first component and at least one compound selected from the group of compounds represented by formula (2) as a second component:

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 (I-1):

3. 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 formula (2-1) to formula (2-12):

4. The liquid crystal composition according to claim 2, wherein the second component is at least one compound selected from the group of compounds represented by formula (2-4):

5. The liquid crystal composition according to claim 2, wherein the second component is at least one compound selected from the group of compounds represented by formula (2-7):

6. The liquid crystal composition according to claim 1, wherein a ratio of the first component is in the range of 5% by weight to 80% by weight and a ratio of the second component is in the range of 10% by weight to 95% by weight based on the total weight of the liquid crystal composition.

7. The liquid crystal composition according to claim 1, further containing at least one compound selected from the group of compounds represented by formula (3):

8. The liquid crystal composition according to claim 7, wherein the third component is at least one compound selected from the group of compounds represented by formula (3-1) to formula (3-13):

9. The liquid crystal composition according to claim 7, wherein a ratio of the third component is in the range of 10% by weight to 80% by weight based on the total weight of the liquid crystal composition.

10. The liquid crystal composition according to claim 1, further containing at least one compound selected from the group of compounds represented by formula (4) as a fourth component:

11. The liquid crystal composition according to claim 10, wherein the fourth component is at least one compound selected from the group of compounds represented by formula (4-1) to formula (4-5):

12. The liquid crystal composition according to claim 10, wherein a ratio of the fourth component is in the range of 5% by weight to 40% by weight based on the total weight of the liquid crystal composition.

13. The liquid crystal composition according to claim 1, wherein a maximum temperature of a nematic phase is 70°

C. or higher, an optical anisotropy (25°

C.) at a wavelength of 589 nanometers is 0.08 or more, and a dielectric anisotropy (25°

C.) at a frequency of 1 kHz is −

2 or less.

15. A liquid crystal display device, containing the liquid crystal composition according to claim 1.

16. The liquid crystal display device according to claim 15, wherein an operating mode in the liquid crystal display device is a VA mode, an IPS mode, an FFS mode or a PSA mode, and a driving mode in the liquid crystal display device is an active matrix mode.

17. Use of the liquid crystal composition according to claim 1 in the liquid crystal display device.

14. A compound represented by formula (I-1-1):

18. A compound represented by formula (I-1-1) according to claim 14:

wherein p is an integer from 1 to 12; and

R⁹ is alkenyl having 2 to 3 carbons.