Liquid crystal composition and liquid crystal display device

Patent metadata

Field	Value
Publication number	US-9512360-B2
Application number	US-201514630649-A
Country	US
Kind code	B2
Filing date	Feb 25, 2015
Priority date	Feb 26, 2014
Publication date	Dec 6, 2016
Grant date	Dec 6, 2016

Abstract

To provide a liquid crystal composition having at least one or a suitable balance regarding at least two of characteristic such as high maximum temperature of a nematic phase, low minimum temperature thereof, small viscosity, suitable optical anisotropy, large dielectric anisotropy, large specific resistance, high stability to ultraviolet light or heat; an AM device having short response time, a large voltage holding ratio, a large contrast ratio, long service life and so forth. The liquid crystal composition has positive dielectric anisotropy and contains a specific compound having high maximum temperature and large refractive index anisotropy as a first component, and may contain a specific compound having large positive dielectric anisotropy as a second component, a specific compound having high maximum temperature or small viscosity as a third component or a specific compound having negative dielectric anisotropy as a fourth component, and a liquid crystal display device includes the composition.

First claim

What is claimed is:

1. A liquid crystal composition that has a positive dielectric anisotropy and contains at least one compound selected from the group consisting of compounds represented by formula (1) as a first component, and at least one compound selected from the group consisting of compounds represented by formula (2) as a second component:

wherein, in formula (1), R 1 and R 2 are independently alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons, alkenyl having 2 to 12 carbons, alkyl having 1 to 12 carbons in which at least one hydrogen is replaced by halogen, or alkenyl having 2 to 12 carbons in which at least one hydrogen is replaced by halogen; ring A, ring B and ring C are independently 1,4-phenylene, or 1,4-phenylene in which at least one hydrogen is replaced by fluorine or chlorine, and
in formula (2), R 3 is alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons or alkenyl having 2 to 12 carbons; ring D is 1,4-cyclohexylene, 1,4-phenylene, 2-fluoro-1,4-phenylene, 2,3 -difluoro-1,4-phenylene, 2,6-difluoro-1,4-phenylene, pyrimidine-2,5-diyl, 1,3-dioxane-2,5-diyl or tetrahydropyran-2,5-diyl; Z 1 is a single bond, ethylene, carbonyloxy or difluoromethyleneoxy; X 1 and X 2 are independently hydrogen or fluorine; Y 1 is fluorine, chlorine, alkyl having 1 to 12 carbons in which at least one hydrogen is replaced by halogen, alkoxy having 1 to 12 carbons in which at least one hydrogen is replaced by halogen, or alkenyloxy having 2 to 12 carbons in which at least one hydrogen is replaced by halogen; and p is 1, 2, 3 or 4.

2. The liquid crystal composition according to claim 1 , containing at least one compound selected from the group consisting of compounds represented by formula (1-1) to formula (1-4) as the first component:

wherein, in formula (1-1) to formula (1-4), R 1 and R 2 are independently alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons, alkenyl having 2 to 12 carbons, alkyl having 1 to 12 carbons in which at least one hydrogen is replaced by halogen, or alkenyl having 2 to 12 carbons in which at least one hydrogen is replaced by halogen.

3. The liquid crystal composition according to claim 1 , wherein a ratio of the first component is in the range of 5% by weight to 30% by weight based on the weight of the liquid crystal composition.

4. The liquid crystal composition according to claim 1 , containing at least one compound selected from the group consisting of compounds represented by formula (2-1) to formula (2-34) as the second component:

wherein, in formula (2-1) to formula (2-34), R3 is alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons or alkenyl having 2 to 12 carbons.

5. The liquid crystal composition according to claim 1 , wherein a ratio of the second component is in the range of 10% by weight to 70% by weight based on the weight of the liquid crystal composition.

6. The liquid crystal composition according to claim 1 , containing at least one compound selected from the group consisting of compounds represented by formula (3) as a third component:

wherein, in formula (3), R 4 and R 5 are independently alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons, alkenyl having 2 to 12 carbons, alkyl having 1 to 12 carbons in which at least one hydrogen is replaced by halogen, or alkenyl having 2 to 12 carbons in which at least one hydrogen is replaced by halogen; ring E and ring F are independently 1,4-cyclohexylene, 1,4-phenylene, 2-fluoro-1,4-phenylene or 2,5-difluoro-1,4-phenylene; Z 2 is a single bond, ethylene or carbonyloxy; n is 1, 2 or 3; and when n is 2, and two of ring E, and ring F are 1,4-phenylene, 2-fluoro-1,4-phenylene or 2,5-difluoro-1,4-phenylene, Z 2 is a single bond or carbonyloxy.

7. The liquid crystal composition according to claim 6 , containing at least one compound selected from the group consisting of compounds represented by formula (3-1) to formula (3-13) as the third component:

wherein, in formula (3-1) to formula (3-13), R 4 and R 5 are independently alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons, alkenyl having 2 to 12 carbons, alkyl having 1 to 12 carbons in which at least one hydrogen is replaced by halogen, or alkenyl having 2 to 12 carbons in which at least one hydrogen is replaced by halogen.

8. The liquid crystal composition according to claim 6 , wherein a ratio of the third component is in the range of 25% by weight to 80% by weight based on the weight of the liquid crystal composition.

9. The liquid crystal composition according to claim 6 , containing at least one compound selected from the group consisting of compounds represented by formula (4) as a fourth component:

wherein, in formula (4), R 6 and R 7 are independently alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons, alkenyl having 2 to 12 carbons, alkenyloxy having 2 to 12 carbons, or alkyl having 1 to 12 carbons in which at least one hydrogen is replaced by halogen; ring G and ring K are independently 1,4-cyclohexylene, 1,4-cyclohexenylene, 1,4-phenylene, or 1,4-phenylene in which at least one hydrogen is replaced by fluorine or chlorine, or tetrahydropyran-2,5-diyl; ring J is 2,3-difluoro-1,4-phenylene, 2-chloro-3-fluoro-1,4-phenylene, 2,3-difluoro-5-methyl-1,4-phenylene, 3,4,5-trifluoronaphthalene-2,6-diyl or 7,8-difluorochroman-2,6-diyl; Z 3 and Z 4 are independently a single bond, ethylene, carbonyloxy or methyleneoxy; a is 1,2 or 3, and b is 0 or 1; a sum of a and b is 3 or less; and when a sum of a and b is 2, and a pieces of ring G and b pieces of ring K are 1,4-phenylene, or 1,4-phenyleneat in which least one of hydrogen is replaced by fluorine or chlorine, Z 3 and Z 4 are independently a single bond, carbonyloxy or methyleneoxy.

10. The liquid crystal composition according to claim 9 , containing at least one compound selected from the group consisting of compounds represented by formula (4-1) to formula (4-19) as the fourth component:

wherein, in formula (4-1) to formula (4-19), R 6 and R 7 are independently alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons, alkenyl having 2 to 12 carbons, alkenyloxy having 2 to 12 carbon, or alkyl having 1 to 12 carbons in which at least one hydrogen is replaced by halogen.

11. The liquid crystal composition according to claim 9 , wherein a ratio of the fourth component is in the range of 3% by weight to 25% by weight based on the weight of the liquid crystal compositi

Assignees

• Jnc Corp
• Jnc Petrochemical Corp

Inventors

• Saito Masayuki
• Furusato Yoshimasa

Classifications

• C09K19/3066

  in which the rings are linked by a chain containing carbon and oxygen atoms, e.g. esters or ethers · CPC title

• C09K19/14

  linked by a carbon chain · CPC title

• C09K2019/3078

  Cy-Cy-COO-Ph-Cy · CPC title

• C09K2019/3077

  Cy-Cy-COO-Ph · CPC title

• C09K2019/0466

  the linking chain being a -CF2O- chain · CPC title