Nematic liquid crystal composition and liquid crystal display element using same

Patent metadata

Field	Value
Publication number	US-10106740-B2
Application number	US-201314651001-A
Country	US
Kind code	B2
Filing date	Nov 29, 2013
Priority date	Dec 12, 2012
Publication date	Oct 23, 2018
Grant date	Oct 23, 2018

Abstract

There is provided a liquid crystal composition having a dielectric anisotropy (Δε) large in absolute value, a sufficiently low viscosity (η), a sufficiently low rotational viscosity (γ 1 ), and a high elastic constant (K 33 ) without decreased refractive index anisotropy (Δn) or nematic phase-isotropic liquid phase transition temperature (T ni ). A liquid crystal display device, such as a VA mode liquid crystal display device, including the liquid crystal composition has high response speed and good display quality with few or no display defects. The liquid crystal display device including the liquid crystal composition is useful as an active-matrix liquid crystal display device and is applicable as a liquid crystal display device such as a VA mode or PSVA mode liquid crystal display device.

First claim

The invention claimed is:

1. A liquid crystal composition comprising a first component and a second component, the first component comprising a compound represented by formula (I):

the first component being present in an amount of 10 to 30% by mass, and
the second component comprising one or more compounds selected from compounds represented by general formula (II):

wherein in the general formula (II), R 1 and R 2 are each independently 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, wherein one or more nonadjacent —CH 2 — groups present in R 1 and R 2 are each independently optionally replaced by —O— and/or —S—, and one or more hydrogen atoms present in R 1 and R 2 are each independently optionally replaced by a fluorine atom or a chlorine atom; rings A and B are each independently trans-1,4-cyclohexylene, 1,4-phenylene, 2-fluoro-1,4-phenylene, 3-fluoro-1,4-phenylene, 3,5-difluoro-1,4-phenylene, 2,3-difluoro-1,4-phenylene; p is 0, 1, or 2; and Z is —CH 2 O— or —CH 2 CH 2 —).

2. The liquid crystal composition according to claim 1 , wherein the liquid crystal composition has a dielectric anisotropy (Δε) at 25° C. of −2.0 to −8.0, a refractive index anisotropy (Δn) at 20° C. of 0.08 to 0.14, a viscosity (η) at 20° C. of 10 to 30 mPa·s, a rotational viscosity (γ 1 ) at 20° C. of 60 to 130 mPa·s, 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 present in an amount of 10% to 90% by mass.

4. The liquid crystal composition according to claim 1 , wherein the compounds of general formula (II) for the second component are compounds of general formulae (II-A1) to (II-A5) and (II-B1) to (II-B5):

(wherein R 3 and R 4 are each independently an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, wherein one or more hydrogen atoms present in R 3 and R 4 are each independently optionally replaced by a fluorine atom).

5. The liquid crystal composition according to claim 4 , wherein the second component comprises one or more compounds selected from the group consisting of compounds represented by general formulae (II-A1) to (II-A5).

6. The liquid crystal composition according to claim 1 , further comprising a third component, the third component comprising one or more compounds selected from the group consisting of compounds represented by general formulae (III-A) to (III-J):

(wherein R 5 is an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms; and R 6 is 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, wherein the compounds represented by general formula (III-A) do not include the compound represented by formula (I)).

7. The liquid crystal composition according to claim 6 , wherein the liquid crystal composition comprises the compound represented by formula (I), a compound represented by general formula (II-A1), and a compound represented by general formula (III-A),

(wherein R 3 and R 4 are each independently an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, wherein one or more hydrogen atoms present in R 3 and R 4 are each independently optionally replaced by a fluorine atom).

8. The liquid crystal composition according to claim 6 , wherein the liquid crystal composition comprises the compound represented by formula (I), a compound represented by general formula (II-A3), and a compound represented by general formula (III-A),

(wherein R 3 and R 4 are each independently an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, wherein one or more hydrogen atoms present in R 3 and R 4 are each independently optionally replaced by a fluorine atom).

9. The liquid crystal composition according to claim 6 , wherein the liquid crystal composition comprises the compound represented by formula (I), a compound represented by general formula (II-B1), and a compound represented by general formula (III-A),

(wherein R 3 and R 4 are each independently an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, wherein one or more hydrogen atoms present in R 3 and R 4 are each independently optionally replaced by a fluorine atom).

10. The liquid crystal composition according to claim 6 , wherein the liquid crystal composition comprises the compound represented by formula (I), a compound represented by general formula (II-B2), and a compound represented by general formula (III-A),

(wherein R 3 and R 4 are each independently an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, wherein one or more hydrogen atoms present in R 3 and R 4 are each independently optionally replaced by a fluorine atom).

11. The liquid crystal composition according to claim 6 , wherein the liquid crystal composition comprises the compound represented by formula (I), a compound represented by general formula (II-B3), and a compound represented by general formula (III-A),

(wherein R 3 and R 4 are each independently an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, wherein one or more hydrogen atoms present in R 3 and R 4 are each independently optionally replaced by a fluorine atom).

12. The liquid crystal composition according to claim 6 , wherein the liquid crystal composition comprises the compound represented by formula (I), a compound represented by general formula (II-B4), and a compound represented by general formula (III-A),

(wherein R 3 and R 4 are each independently an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, wherein one or more hydrogen atoms present in R 3 and R 4 are each independently optionally replaced by a fluorine atom).

13. The liquid crystal composition according to claim 1 , further comprising another component, the other component comprising one or more compounds represented by general formula (V):

(wherein R 21 and R 22 are each independently an alkyl group having 1 to 8 carbon at

Assignees

• Dainippon Ink & Chemicals

Inventors

• Sudo Go
• Kawakami Shotaro

Classifications

• C09K2019/301

  Cy-Cy-Ph · CPC title

• C09K2019/3004

  Cy-Cy · CPC title

• C09K19/542

  Macromolecular compounds · CPC title

• C09K19/0216

  Super Birefringence Effect (S.B.E.); Electrically Controlled Birefringence (E.C.B.) · CPC title

• C09K19/20

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