Liquid crystal composition and liquid crystal display device

• US 10,294,424 B2
• Filed: 10/08/2014
• Issued: 05/21/2019
• Est. Priority Date: 11/18/2013
• 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: Furusato, Yoshimasa, Saito, Masayuki
• Primary Examiner(s): Visconti, Geraldina
• Application Number:
  US15/035,485
• Publication Number:
  US 20160257883A1
• Time in Patent Office: 1,686 Days
• Field of Search: 25229961
• CPC Class Codes: C09K 19/0208 Twisted Nematic (T.N.); Super Twisted Nematic (S.T.N.); Optical Mode Interference (O.M.I.)
• CPC Class Codes: C09K 19/0216 Super Birefringence Effect (S.B.E.); Electrically Controlled Birefringence (E.C.B.)
• CPC Class Codes: C09K 19/20 linked by a chain containing carbon and oxygen atoms as chain links, e.g. esters or ethers
• CPC Class Codes: C09K 19/3003 Compounds containing at least two rings in which the different rings are directly linked (covalent bond)
• 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 19/3068 chain containing -COO- or -OCO- groups
• CPC Class Codes: C09K 19/3402 having oxygen as hetero atom sugars C09K19/0422
• 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 2019/0466 the linking chain being a -CF2O- chain
• CPC Class Codes: C09K 2019/3016 Cy-Ph-Ph
• CPC Class Codes: C09K 2019/3077 Cy-Cy-COO-Ph
• CPC Class Codes: C09K 2019/3078 Cy-Cy-COO-Ph-Cy
• CPC Class Codes: C09K 2019/3083 Cy-Ph-COO-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

Abstract

To show a liquid crystal composition satisfying at least one of characteristics such as a high maximum temperature of a nematic phase, a low minimum temperature thereof, small viscosity, suitable optical anisotropy, large positive dielectric anisotropy or having a suitable balance regarding at least two of the characteristics, and an AM device including the liquid crystal composition. The liquid crystal composition contains a specific compound having high maximum temperature and low minimum temperature as a first component, and the liquid crystal composition may contain a specific compound having large positive dielectric anisotropy as a second component, a specific compound having high maximum temperature or small viscosity as a third component, a specific compound having large positive dielectric anisotropy as a fourth component, or a specific compound having negative dielectric anisotropy as a fifth component.

Claims

1. A liquid crystal composition that has a positive dielectric anisotropy, and consists essentially of at least one compound selected from compounds represented by formula (1), at least one compound selected from compounds represented by formula (2) and at least one compound selected from compounds represented by formula (3), and optionally contains at least one compound selected from compounds represented by formula (4) and/or optionally contains at least one compound selected from compounds represented by formula (5) :

2. The liquid crystal composition according to claim 1, wherein a proportion of the at least one compound selected from compounds represented by formula (1) is in the range of 3% by weight to 30% by weight based on the weight of the liquid crystal composition.

3. The liquid crystal composition according to claim 1, containing at least one compound selected from the group of compounds represented by formulas (2-1) to (2-7) as the at least one compound selected from compounds represented by formula (2):

4. The liquid crystal composition according to claim 1, wherein a proportion of the at least one compound selected from compounds represented by formula (2) is in the range of 5% by weight to 50% by weight based on the weight of the liquid crystal composition.

5. The liquid crystal composition according to claim 1, containing at least one compound selected from the group of compounds represented by formulas (3-1) to (3-12) as the at least one compound selected from compounds represented by formula (3):

6. The liquid crystal composition according to claim 1, wherein a proportion of the at least one compound selected from compounds represented by formula (3) is in the range of 10% by weight to 90% by weight based on the weight of the liquid crystal composition.

7. The liquid crystal composition according to claim 1, containing at least one compound selected from the group of compounds represented by formulas (4-1) to (4-19) as the at least one compound selected from compounds represented by formula (4):

8. The liquid crystal composition according to claim 1, wherein a proportion of the at least one compound selected from compounds represented by foiniula (4) is in the range of 3% by weight to 50% by weight based on the weight of the liquid crystal composition.

9. The liquid crystal composition according to claim 1, containing at least one compound selected from the group of compounds represented by formulas (5-1) to (5-19) as the at least one compound selected from compounds represented by formula (5):

10. The liquid crystal composition according to claim 1, wherein a proportion of the at least one compound selected from compounds represented by formula (5) is in the range of 3% by weight to 25% by weight based on the weight of the liquid crystal composition.

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

C. or higher, an optical anisotropy (measured at 25°

C.) at a wavelength of 589 nanometers is 0.07 or more and a dielectric anisotropy (measured at 25°

C.) at a frequency of 1 kHz is 2 or more.

12. A liquid crystal display device, including the liquid crystal composition according to claim 1.

13. The liquid crystal display device according to claim 12, wherein an operating mode in the liquid crystal display device includes a TN mode, an ECB mode, an OCB mode, an IPS mode or an FPA mode, and a driving mode in the liquid crystal display device includes an active matrix mode.