Liquid crystal compound and use thereof

Patent metadata

Field	Value
Publication number	US-10954444-B2
Application number	US-201716068471-A
Country	US
Kind code	B2
Filing date	May 23, 2017
Priority date	May 23, 2016
Publication date	Mar 23, 2021
Grant date	Mar 23, 2021

Abstract

The present application relates to a novel liquid crystal compound and a use thereof. The novel liquid crystal compounds of the present application can exhibit a smectic A phase over a wide temperature range. The novel liquid crystal compounds of the present application can be usefully used in the technical fields to which smectic A liquid crystals can be applied, for example, bistable devices.

First claim

The invention claimed is:

1. A liquid crystal compound of the following Formula 1:

in said Formula 1,
R 1 to R 4 are each independently an alkyl group having 1 to 3 carbon atoms,
R 5 is —F, —Cl, —Br, —OF 3 , —NCS, —CN or —OCH 3 ,
X is —CH 2 — or —O—,
k is an integer of 0 to 9,
l is an integer of 0 to 2,
m is an integer of 2 to 13,
Y 1 to Y 8 are each independently CH, CF or N, where CF of Y 1 to Y 8 is not more than 2,
A is the following Formula 2, or a single bond, —O—, —S—, —CO—, —COO—, —OCO—, —S—CO—, —CO—S—, —O—COO, —CO—NR 0 —, —NR 0 —CO—, —NR 0 —CO—NR 00 —, —NR 0 —CO—O—, —O—CO—NR 0 —, OCH 2 —, —OCH 2 —, —SCH 2 —, —CH 2 S—, —CF 2 O—, —OCF 2 —, —CF 2 S—, —SCF 2 —, —CH 2 CH 2 —, —(CH 2 ) 4 —, —CF 2 CH 2 —, —CH 2 CHF 2 —, —CH═N—, —N═CH—, —NH—NH—, —N═N—, —CH—CR 0 —, —CY 1 ═CY 2 —, —C═C—, —CH═CH—COO— or —OCO—CH═CH—, where R 0 , R 00 , Y 1 and Y 2 are each independently H or CH 3 ;

in said Formula 2, Z 1 and Z 2 are each independently CH or N, and when said Z 1 and Z 2 are each CH, at least one of Y 1 to Y 8 is N, and
wherein when A is not a heterocyclic structure then at least one of Y 1 to Y 8 is N.

2. The liquid crystal compound according to claim 1 , wherein
in said Formula 1, R 1 to R 4 are a methyl group.

3. The liquid crystal compound according to claim 1 , wherein
in said Formula 1, R 5 is —CN.

4. The liquid crystal compound according to claim 1 , wherein
in said Formula 1, k is an integer of 0 to 3.

5. The liquid crystal compound according to claim 1 , wherein
in said Formula 1, l is 0 or 1.

6. The liquid crystal compound according to claim 1 , wherein
in said Formula 1, m is an integer of 7 to 9.

7. The liquid crystal compound according to claim 1 , wherein
in said Formula 1, A is a single bond, any one of Y 1 to Y 8 is N and the remainder are CH.

8. The liquid crystal compound according to claim 1 , wherein
in said Formula 1, A is Formula 2, Z 1 and Z 2 are CH, any one of Y 1 to Y 8 is N and the remainder are CH.

9. The liquid crystal compound according to claim 1 , wherein
in said Formula 1, A is Formula 2, Z 1 and Z 2 are N, and Y 1 to Y 8 are each CH.

10. The liquid crystal compound according to claim 1 , wherein
said liquid crystal compound of Formula 1 has a structure represented by the following formulas a-1 to a-18:

11. The liquid crystal compound according to claim 1 , wherein
the liquid crystal compound exhibits a smectic A phase in a temperature range of −20° C. to 100° C.

12. The liquid crystal compound according to claim 1 , wherein
the liquid crystal compound has a dielectric anisotropy of −1.0 to 20.

13. A bistable device comprising the liquid crystal compound of claim 1 .

14. The bistable device according to claim 13 , comprising two electrode substrates disposed opposite to each other and a liquid crystal layer containing the liquid crystal compound of claim 1 and a charging substance between said two electrode substrates.

Assignees

• Lg Chemical Ltd

Inventors

• Lim Eun Jung
• Koo Ki Chul
• Oh Dong Hyun

Classifications

• C09K19/408

  Polysiloxanes · CPC title

• C09K19/3444 Primary

  the heterocyclic ring being a six-membered aromatic ring containing one nitrogen atom, e.g. pyridine · CPC title

• G02F1/13

  based on liquid crystals, e.g. single liquid crystal display cells · CPC title

• C09K19/3483

  the heterocyclic ring being a non-aromatic ring · CPC title

• C07F7/0812

  comprising a heterocyclic ring · CPC title