Nematic liquid crystal composition and liquid crystal display device using the same

Patent metadata

Field	Value
Publication number	US-2016237347-A1
Application number	US-201414787139-A
Country	US
Kind code	A1
Filing date	Sep 25, 2014
Priority date	Oct 3, 2013
Publication date	Aug 18, 2016
Grant date	—

Abstract

Without reductions in refractive index anisotropy (Δn) and nematic phase-isotropic liquid phase transition temperature (T ni ), the liquid crystal composition has sufficiently low solid phase-nematic phase transition temperature (T cn ), sufficiently small viscosity (η), sufficiently small rotational viscosity (γ1), a large elastic constant (K 33 ), and negative dielectric anisotropy (Δ∈) with a large absolute value. The liquid crystal composition contains a first component that is a compound represented by Formula (N2), a second component that is at least one compound represented by General Formula (N3), and a third component that is at least one compound having a negative dielectric anisotropy (Δ∈) with an absolute value of greater than three. There is also provided a liquid crystal display device using such a liquid crystal composition.

First claim

1 . A liquid crystal composition comprising a first component that is a compound represented by Formula (N2),

a second component that is at least one compound represented by General Formula (N3)

(where R p and R q each 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 of which a —CH 2 — or at least two —CH 2 — not adjoining each other are each independently optionally substituted with —O— or —S— and of which one or more hydrogen atoms are each independently optionally substituted with a fluorine atom or a chlorine atom; a ring J represents 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; and rings F and K each represent a 1,4-phenylene group of which a hydrogen atom is optionally substituted with a fluorine atom), and a third component that is at least one compound having a negative dielectric anisotropy (Δ∈) with an absolute value of greater than three.

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

3 . The liquid crystal composition according to any one of claim 1 , wherein at least one compound selected from the group consisting of compounds represented by General Formulae (N3-3) and (N3-4) is used as the second component,

(where R p and R q have the same meanings as in claim 1 , and a hydrogen atom of a 1,4-phenylene group is optionally substituted with a fluorine atom).

4 . The liquid crystal composition according to claim 1 , wherein the amount of the first component is from 3 to 40 mass %.

5 . The liquid crystal composition according to claim 1 , wherein the amount of the second component is from 3 to 40 mass %.

6 . The liquid crystal composition according to claim 1 , wherein at least one compound represented by General Formula (II) is used as the third component

(where R 1 and R 2 each independently represent an alkyl group having 1 to 10 carbon atoms, an alkoxy 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 of which one —CH 2 — or at least two —CH 2 — not adjoining each other are each independently optionally substituted with —O— or —S— and of which one or more hydrogen atoms are each independently optionally substituted with a fluorine atom or a chlorine atom; 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 represents 0, 1, or 2; in the case where p represents 2, the two rings B may be the same as or different from each other; Z represents —OCH 2 —, —CH 2 O—, —CF 2 O—, —OCF 2 —, —CH 2 CH 2 —, —CF 2 CF 2 —, or a single bond).

7 . The liquid crystal composition according to claim 1 , further comprising a fourth component that is at least one compound selected from the group consisting of compounds represented by General Formulae (IV-1) to (IV-5)

(where R 5 represents an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms; 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 of which one —CH 2 — or at least two —CH 2 — not adjoining each other are each independently optionally substituted with —O— or —S— and of which one or more hydrogen atoms are each independently optionally substituted with a fluorine atom; and the compound represented by General Formula (IV-1) excludes compounds corresponding to the compound represented by Formula (N2)).

8 . The liquid crystal composition according to claim 1 , further comprising an additional component that is at least one compound represented by General Formula (V)

(where 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 of which one —CH 2 — or at least two —CH 2 — not adjoining each other are each independently optionally substituted with —O— or —S— and of which one or more hydrogen atoms are each independently optionally substituted with a fluorine atom).

9 . The liquid crystal composition according to claim 1 , further comprising at least one polymerizable compound.

10 . The liquid crystal composition according to claim 9 , wherein the polymerizable compound is at least one polymerizable compound represented by General Formula (M)

(where X 201 and X 202 each independently represent a hydrogen atom, a methyl group, or a —CF 3 group; Sp 201 and Sp 202 each independently represent a single bond, an alkylene group having 1 to 8 carbon atoms, or —O—(CH 2 ) s — (where s represents an integer from 2 to 7, and the oxygen atom is bonded to a ring); rings M 201 , M 202 , and M 203 each independently represent a trans-1,4-cyclohexylene group (of which one —CH 2 — or at least two —CH 2 — not adjoining each other are optionally substituted with —O— or —S—), a 1,4-phenylene group (of which one —CH═ or at least two —CH═ not adjoining each other are optionally substituted with —N═), 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; independently in each of these groups, a hydrogen atom is optionally substituted with a fluorine atom, a —CF 3 group, an alkyl group having 1 to 10 carbon atoms, an alkoxyl group having 1 to 10 carbon atoms, or any of the following structures represented by Formulae (R-1) to (R-15)

Z 201 and Z 202 each independently represent —OCH 2 —, —CH 2 O—, —COO—, —OCO—, —CF 2 O—, —OCF 2 —, —CH 2 CH 2 —, —CF 2 CF 2

Assignees

• Dainippon Ink & Chemicals

Inventors

• Sudo Go
• Kawakami Shotaro

Classifications

• C09K19/542

  Macromolecular compounds · 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

• G02F1/1362

  Active matrix addressed cells {(G02F1/134336, G02F1/134363 take precedence)} · CPC title

• C09K19/3001

  Cyclohexane rings · CPC title

• C09K2019/548

  stabilizing the alignment; Polymer stabilized alignment · CPC title