Liquid crystal compound and liquid crystal composition

Patent metadata

Field	Value
Publication number	US-9803140-B2
Application number	US-201615161010-A
Country	US
Kind code	B2
Filing date	May 20, 2016
Priority date	Oct 13, 2015
Publication date	Oct 31, 2017
Grant date	Oct 31, 2017

Abstract

The present disclosure discloses a liquid crystal compound and a liquid crystal composition. The liquid crystal compound has a general structural formula as represented by formula I. The liquid crystal composition provided by the present disclosure has a lower rotary viscosity γ 1 , can achieve a quick response, and further has an appropriate dielectric anisotropy Δ∈, an appropriate optical anisotropy Δn, a high stability to heat and light, a high VHR numerical value especially in the case where the liquid crystal is under harsh conditions, and a stability to electric field and electromagnetic radiation. As a liquid crystal material for use in thin film transistor techniques (TFT-LCD), the material further has the properties of a wider nematic phase temperature range, an appropriate birefringence anisotropy, a very high electrical resistivity, a good anti-ultraviolet performance, a high charge holding rate, a low vapor pressure etc.

First claim

The invention claimed is:

1. A compound as represented by formula I,

in said formula I, R 1 represents an alkyl having a carbon atom number of 1-9, a fluoro-substituted alkyl having a carbon atom number of 1-9, an alkoxy having a carbon atom number of 1-9, a fluoro-substituted alkoxy having a carbon atom number of 1-9, an alkenyl having a carbon atom number of 2-9, a fluoro-substituted alkenyl having a carbon atom number of 2-9, an alkenyloxy having a carbon atom number of 3-8, or an alkenyloxy having a carbon atom number of 3-8;

represents 1,4-phenylene, fluoro-substituted 1,4-phenylene, 1,4-cyclohexylidene, 1,4-cyclohexenylene, or 1,4-cyclohexylidene with one or two —CH 2 -being substituted by oxygen atoms;
X 1 and X 3 each independently represent hydrogen or fluorine; and
X 2 represents hydrogen, fluorine, an alkyl having a carbon atom number of 1-9, an alkoxy having a carbon atom number of 1-9, a fluoro-substituted alkyl having a carbon atom number of 1-9, a fluoro-substituted alkoxy having a carbon atom number of 1-9, or an alkenyl having a carbon atom number of 2-9;
wherein said fluoro-substituted 1,4-phenylene in said

and
wherein said 1,4-cyclohexylidene with one or two —CH 2 — being substituted by oxygen atoms in said

2. The compound according to claim 1 , wherein said compound as represented by formula I is a compound of formula IA

in said formula IA, both definitions of R 1 and

are identical to the definitions of R 1 and

in claim 1 .

3. The compound according to claim 2 , wherein said compound as represented by formula I is any one of the compounds as represented by formulae I1 to I12:

in said formulae I1 to I12, R 11 represents an alkyl having a carbon atom number of 1-5; and
X 21 represents an alkyl having a carbon atom number of 1-5, an alkoxy having a carbon atom number of 1-5, an alkenyl having a carbon atom number of 2-5, a fluoro-substituted alkyl having a carbon atom number of 1-5, or a fluoro-substituted alkoxy having a carbon atom number of 1-5.

4. A liquid crystal mixture containing component A;
said component A consisting of at least one of the compounds as represented by formula I of claim 1 .

5. The liquid crystal mixture according to claim 4 , wherein said liquid crystal mixture further comprises components B and C;
said component B consisting of at least one of the compounds as represented by formula II; and
said component C consisting of at least one of the compounds as represented by formula III;

in said formulae II and III, R 2 , R 3 , and R 4 are each selected from a C1-C6 alkyl, a C2-C6 alkenyl, or a C1-C6 alkoxy;

each independently represent 1,4-cyclohexylidene, 1,4-cyclohexenylene, or 1,4-phenylene;

is selected from at least one of 1,4-cyclohexylidene, 1,4-cyclohexenylene, 1,4-phenylene, and fluoro-substituted 1,4-phenylene;
p is 2 or 3;
(F) represents H or F;
X 4 is F, Cl, or —OCF 3 ; and
wherein said fluoro-substituted 1,4-phenylene in said

represents

6. The liquid crystal mixture according to claim 5 , wherein said liquid crystal mixture consists of components A, B, and C.

7. The liquid crystal mixture according to claim 5 , wherein said compound as represented by formula II is any one of the compounds as represented by formulae II1 to II13:

said compound as represented by formula III is any one of the compounds as represented by formulae III1 to III22:

in said formulae III1 to III22, R 4 is selected from at least one of a C1-C6 alkyl, a C2-C6 alkenyl, and a C1-C6 alkoxy.

8. The liquid crystal mixture according to claim 5 , wherein said liquid crystal mixture further comprises at least one of components D, E and F;
said component D consists of at least one of the compounds as represented by formula IV;

in said formula IV, R 51 and R 52 are each selected from any one of a C1-C6 alkyl, a C2-C6 alkenyl, and a C1-C6 alkoxy;
m is 1 or 2; and

are each selected from at least one of 1,4-cyclohexylidene, 1,4-cyclohexenylene, 1,4-phenylene, and fluoro-substituted 1,4-phenylene;
said component E consists of at least one of the compounds as represented by formula V;

in said formula V, R 61 and R 62 are each selected from any one of a C1-C6 alkyl, a C2-C6 alkenyl, and a C1-C6 alkoxy;
n is 1 or 2;

is selected from at least one of 1,4-cyclohexylidene, 1,4-cyclohexenylene, 1,4-phenylene, and fluoro-substituted 1,4-phenylene;
Z is a single bond, —CH 2 O—, —COO—, or —CH 2 CH 2 —; and
said component F consists of at least one of the compounds as represented by formula VI;

in said formula VI, R 71 and R 72 are each selected from any one of a C1-C6 alkyl, a C2-C6 alkenyl, and a C1-C6 alkoxy; and
wherein said fluoro-substituted 1,4-phenylene in said

and

represents

9. The liquid crystal mixture according to claim

Assignees

• Shijiazhuang Chengzhi Yonghua Display Materials Co Ltd

Inventors

• Yuan Guoliang
• Zhao Lei
• Wang Kui
• Wang Mingxia
• Hua Ruimao
• Meng Jinsong

Classifications

• C09K19/3402

  having oxygen as hetero atom (sugars C09K19/0422) · CPC title

• C07C43/225 Primary

  containing halogen · 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

• C09K2019/3422

  the heterocyclic ring being a six-membered ring · CPC title

• C09K19/0208

  Twisted Nematic (T.N.); Super Twisted Nematic (S.T.N.); Optical Mode Interference (O.M.I.) · CPC title