Lateral trifluoromethyl-containing liquid crystal compound, liquid crystal mixture and display device

Patent metadata

Field	Value
Publication number	US-10975306-B2
Application number	US-201816164149-A
Country	US
Kind code	B2
Filing date	Oct 18, 2018
Priority date	Nov 16, 2017
Publication date	Apr 13, 2021
Grant date	Apr 13, 2021

Abstract

Provide are a liquid crystal compound represented by formula I, and a liquid crystal mixture comprising the compound

A lateral trifluoromethyl-containing liquid crystal compound having the structural characteristics of Formula I not only has a negative dielectric anisotropy (Δε), an appropriate optical anisotropy (Δn), a higher clearing point (CP), a prominent low-temperature miscibility with other liquid crystals, and a low rotary viscosity (γ1), but also has a good stability to UV and high temperatures, particularly, a negative dielectric anisotropy. Same can be applied to the formulation of liquid crystal compositions of positive and negative types, and it is particularly prominent that same has the advantages of a good solubility at low temperatures and a high transmittance.

First claim

The invention claimed is:

1. A liquid crystal compound, represented by formula 2-a, 1-b to 1-e, 3-a or 4-a:

2. A liquid crystal mixture, comprising one or more compounds represented by formula 2-a, 1-b to 1-e, 3-a and 4-a of claim 1 , and one or more compounds represented by formula II

wherein R 3 and R 4 each independently represent H, an alkyl group having a carbon atom number of 1-5, an alkenyl group having a carbon atom number of 2-6, or an alkoxy group having a carbon atom number of 1-5, wherein any CH 2 therein may be substituted with cyclopentyl, cyclobutyl or cyclopropyl;
m represents 1 or 2; and

each independently represent one or more of phenylene, cyclohexylene and/or cyclohexenylene.

3. The liquid crystal mixture according to claim 2 , wherein concentrations in mass percentage of said compound represented by formula 2-a, 1-b to 1-e, 3-a and 4-a and said compound represented by formula II are respectively 1-40% and 1-65%.

4. The liquid crystal mixture according to claim 2 , wherein said one or more compounds represented by formula II are one or more of compounds represented by formulas II1 to II22 below:

5. The liquid crystal mixture according to claim 2 , wherein said liquid crystal mixture further comprises one or more of compounds represented by formulas III1 to III14 below:

wherein each R 5 independently represents H, an alkyl group having a carbon atom number of 1-5, an alkenyl group having a carbon atom number of 2-6, or an alkoxy group having a carbon atom number of 1-5, wherein any CH 2 therein may be substituted with cyclopentyl, cyclobutyl or cyclopropyl;
(F) represents F or H; and
(O) represents O or a single bond.

6. The liquid crystal mixture according to claim 2 , wherein said liquid crystal mixture further comprises one or more compounds represented by formula IV:

wherein R 6 represents H, an alkyl group having a carbon atom number of 1-5, an alkenyl group having a carbon atom number of 2-6, or an alkoxy group having a carbon atom number of 1-5, wherein any CH 2 therein may be substituted with cyclopentyl, cyclobutyl or cyclopropyl;
o represents 0 or 1;
each (F) independently represents H or F; and

represents phenylene, cyclohexylene, cyclohexenylene, or a group formed by substituting one or two non-connected CH 2 in cyclohexylene with O.

7. The liquid crystal mixture according to claim 2 , wherein the liquid crystal mixture may further comprise one or more negative compounds of formula V,

wherein R 7 and R 8 each independently represent H, an alkyl group having a carbon atom number of 1-5, an alkenyl group having a carbon atom number of 2-6, or an alkoxy group having a carbon atom number of 1-5, wherein any CH 2 therein may be substituted with cyclopentyl, cyclobutyl or cyclopropyl;
p and q each independently represent 0, 1 or 2, with 1≤p+q≤3;
Z 3 and Z 4 each independently represent a single bond, —CH 2 CH 2 —, —CH 2 O—, —OCH 2 — or —CF 2 O—; and

each independently represent one or more of

8. The liquid crystal mixture according to claim 2 , wherein said liquid crystal mixture further comprises one or more compounds represented by formula VI:

wherein each P independently represents a polymerizable functional group;
each Sp independently represents a spacer group;
M represents H, -Sp-P, F, an alkyl group having a carbon atom number of 1-5, an alkoxy group having a carbon atom number of 1-5, or an alkenyl group having a carbon atom number of 2-5;
r represents 0, 1 or 2;
Z 5 represents a single bond, —COO—, —C≡C—, —C═C— or —CH 2 O—; and

each independently represent one or more of a benzene ring, cyclohexane, indane or a naphthalene ring.

9. A liquid crystal display element or liquid crystal display comprising the liquid crystal compound or mixture of claim 1 , wherein said display element or display is an active matrix display element or display or a passive matrix display element or display.

Assignees

• Shijiazhuang Chengzhi Yonghua Display Materials Co Ltd

Inventors

• Liang Zhian
• Zhang Wei
• Xu Kai
• Wang Kui
• Xiang Yang
• Yuan Shen
• Guo Minsheng
• Zhang Limei

Classifications

• C09K19/0403

  the structure containing one or more specific, optionally substituted ring or ring systems · CPC title

• C09K2019/3019

  Cy-Cy-Ph-Ph · CPC title

• C07C2601/02

  with a three-membered ring · CPC title

• C09K2019/124

  Ph-Ph-Ph-Ph · CPC title

• C09K2019/3025

  Cy-Ph-Ph-Ph · CPC title