Nematic liquid crystal composition and liquid crystal display element including the same

Patent metadata

Field	Value
Publication number	US-9260661-B2
Application number	US-201414422275-A
Country	US
Kind code	B2
Filing date	Jan 16, 2014
Priority date	Jan 21, 2013
Publication date	Feb 16, 2016
Grant date	Feb 16, 2016

Abstract

There is provided a liquid crystal composition having a sufficiently low viscosity (η), a sufficiently low rotational viscosity (γ1), a high elastic constant (K 33 ), and a negative dielectric anisotropy (Δ∈), the absolute value of the negative dielectric anisotropy being large, without a reduction in the refractive index anisotropy (Δn) or the nematic phase-isotropic liquid phase transition temperature (T ni ) thereof. By using the liquid crystal composition, it is possible to provide a liquid crystal display element, such as a VA-type liquid crystal display element, which eliminates or reduces the risk of a faulty display and realizes high display quality and a high-speed response. The liquid crystal display element including the liquid crystal composition according to the present invention may be suitably used as a liquid crystal display element for active-matrix driving and may also be used as, for example, a VA-type or PSVA-type liquid crystal display element.

First claim

The invention claimed is:

1. A liquid crystal composition comprising:
as a first component, a compound represented by Formula (Ib) and a compound represented by Formula (Ic), the content of the compound represented by Formula (Ib) being 10% to 30% by mass, the total content of the first component being 15% to 45% by mass,

and,
as a second component, a compound having a negative dielectric anisotropy (Δ∈), the absolute value of the dielectric anisotropy being more than 3.

2. The liquid crystal composition according to claim 1 , having a dielectric anisotropy (Δ∈) of −2.0 to −8.0 at 25° C., a refractive index anisotropy (Δn) of 0.08 to 0.14 at 20° C., a viscosity (η) of 10 to 30 mPa·s at 20° C., a rotational viscosity (γ 1 ) of 60 to 130 mPa·s at 20° C., and a nematic phase-isotropic liquid phase transition temperature (T ni ) of 60° C. to 120° C.

3. The liquid crystal composition according to claim 1 , wherein the second component is one or more compounds selected from compounds represented by General Formula (II):

(wherein R 1 and R 2 each independently represent an alkyl group having 1 to 10 carbon atoms, an alkoxyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, or an alkenyloxy group having 2 to 10 carbon atoms; one —CH 2 — group included in R 1 and R 2 or two or more —CH 2 — groups that are included in R 1 and R 2 and are not adjacent to each other may be each independently replaced by —O— and/or —S—; one or more hydrogen atoms included in R 1 and R 2 may be each independently replaced by a fluorine atom or a chlorine atom; the rings A and B each independently represent a trans-1,4-cyclohexylene group, a 1,4-phenylene group, a 2-fluoro-1,4-phenylene group, a 3-fluoro-1,4-phenylene group, a 3,5-difluoro-1,4-phenylene group, a 2,3-difluoro-1,4-phenylene group, a 1,4-cyclohexenylene group, a 1,4-bicyclo[2.2.2]octylene group, a piperidine-1,4-diyl group, a naphthalene-2,6-diyl group, a decahydronaphthalene-2,6-diyl group, or a 1,2,3,4-tetrahydronaphthalene-2,6-diyl group; p is 0, 1, or 2; and Z represents —OCH 2 —, —CH 2 O—, —CF 2 O—, —OCF 2 —, —CH 2 CH 2 —, —CF 2 CF 2 —, or a single bond).

4. The liquid crystal composition according to claim 1 , wherein the content of the second component is 10% to 90% by mass.

5. The liquid crystal composition according to claim 3 , wherein General Formula (II) representing the second component is any one of General Formulae (II-A1) to (II-A5) and General Formulae (II-B1) to (II-B5):

(wherein R 3 and R 4 each independently represent an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms; and one or more hydrogen atoms included in R 3 and R 4 may be each independently replaced by a fluorine atom).

6. The liquid crystal composition according to claim 5 , wherein the second component is one or more compounds selected from compounds represented by General Formulae (II-A1) to (II-A5).

7. The liquid crystal composition according to claim 1 , further comprising, as a third component, one or more compounds selected from compounds represented by General Formulae (III-A) to (III-J):

(wherein R 5 represents an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms; and R 6 represents an alkyl group having 1 to 5 carbon atoms, an alkoxyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkenyloxy group having 2 to 5 carbon atoms; and a compound represented by General Formula (III-A) is different from the compound represented by Formula (Ib) and the compound represented by Formula (Ic)).

8. The liquid crystal composition according to claim 1 , wherein the second component is any one of General Formulae (II-A1) to (II-A5) and General Formulae (II-B1) to (II-B5):

(wherein R 3 and R 4 each independently represent an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms; and one or more hydrogen atoms included in R 3 and R 4 may be each independently replaced by a fluorine atom), and
wherein the liquid crystal composition further comprises, as a third component, one or more compounds selected from compounds represented by General Formulae (III-A) to (III-J):

(wherein R 5 represents an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms; and R 6 represents an alkyl group having 1 to 5 carbon atoms, an alkoxyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkenyloxy group having 2 to 5 carbon atoms; and a compound represented by General Formula (III-A) is different from the compound represented by Formula (Ib) and the compound represented by Formula (Ic)).

9. The liquid crystal composition according to claim 8 , including the compound represented by Formula (Ib), the compound represented by Formula (Ic), a compound represented by General Formula (II-A1), and a compound represented by General Formula (III-A).

10. The liquid crystal composition according to claim 8 , including the compound represented by Formula (Ib), the compound represented by Formula (Ic), a compound represented by General Formula (II-A3), and a compound represented by General Formula (III-A).

11. The liquid crystal composition according to claim 8 , including the compound represented by Formula (Ib), the compound represented by Formula (Ic), a compound represented by General Formula (II-B1), and a compound represented by General Formula (III-A).

12. The liquid crystal composition according to claim 8 , including the compound represented by Formula (Ib), the compound represented by Formula (Ic), a compound represented by General Formula (II-B2), and a compound represented by General Formula (III-A).

13. The liquid crystal composition according to claim 8 , including the compound represented by Formula (Ib), the compound represented by Formula (Ic), a compound represented by General Formula (II-B3), and a compound represented by General Formula (III-A).

14. The liquid crystal composition according to claim 8 , including the compound represented by Formula (Ib), the compound represented by Formula (Ic), a compound represented by General Formula (II-B4), and a compound represented by General Formula (III-A).

15. The liquid crystal composition according to claim 1 , further comprising, as another component, one or more compounds selected from compounds represented by General Formula (V):

(wherein R 21 and R 22 each independently represent an alkyl group having 1 to 8 carbon atoms, an alkoxyl group having 1 to 8 carbon atoms, an alkenyl group having 2 to 8 carbon atoms, or an alkenyloxyl group having 2 to 8 carbon atoms).

16. The liquid crystal composition according to claim 1 , including one or more polymer

Assignees

• Dainippon Ink & Chemicals

Inventors

• Sudo Go
• Kawakami Shotaro

Classifications

• C09K19/20

  linked by a chain containing carbon and oxygen atoms as chain links, e.g. esters {or ethers} · CPC title

• C09K19/3066 Primary

  in which the rings are linked by a chain containing carbon and oxygen atoms, e.g. esters or ethers · CPC title

• C09K2019/122

  Ph-Ph · CPC title

• C09K2019/301

  Cy-Cy-Ph · CPC title

• C09K2019/3004

  Cy-Cy · CPC title