Liquid crystal medium
View Patent ↗Discloses are liquid crystal medium based on a mixture of polar compounds, the use thereof for electro-optical purposes, and displays containing the medium.
1. A liquid crystal medium comprising
14 to 20% of two or three compounds of formula I,
0 to 5% of one compound of formula II,
15 to 19% of one or two compounds of formula III,
20 to 23% of two compounds of formula IV,
0 to 7% of one compound of formula V,
11 to 18% of one or two compounds of formula VI,
5 to 7% of one compound of formula VII,
0 to 5% of one compound of formula VIII, and
15 to 20% of two or three compounds of formula IX,
wherein
R 1 and R 2 are, independently of each other, straight-chain alkyl with 1 to 5 C atoms,
R 3 is straight-chain alkenyl with 2 to 4 C atoms,
R 4 is alkoxy with 1 or 2 C atoms,
R 5 is straight-chain alkenyl with 2 to 4 C atoms.
2. A liquid crystal medium according to claim 1 , which comprises one or more of the following compounds
3. A liquid crystal medium according to claim 1 , which comprises
15 to 16% of two compounds of formula I,
2 to 4% of one compound of formula II,
17 to 19% of two compounds of formula III,
21 to 23% of two compounds of formula IV,
15 to 17% of two compounds of formula VI,
5 to 7% of one compound of formula VII, and
18 to 20% of three compounds of formula IX.
4. A liquid crystal medium according to claim 1 , which comprises
18 to 20% of three compounds of formula I,
15 to 17% of one compound of formula III,
20 to 22% of two compounds of formula IV,
4 to 6% of one compounds of formula V,
16 to 18% of two compounds of formula VI,
5 to 7% of one compound of formula VII, and
15 to 17% of two compounds of formula IX.
5. An electro-optical device, containing a liquid crystal medium according to claim 1 .
6. An electro-optical liquid crystal display, containing a liquid crystal medium according to claims 1 .
7. A Liquid crystal medium according to claim 1 , wherein
R 1 and R 2 are, independently of each other, methyl, ethyl, n-propyl, n-butyl or n-pentyl,
R 3 is vinyl or 1E-propenyl,
R 4 is methoxy, and
R 5 is vinyl or 3-butenyl.
8. A Liquid crystal medium according to claim 1 , wherein
R 1 and R 2 are, independently of each other, methyl, ethyl, n-propyl, n-butyl or n-pentyl.
9. A Liquid crystal medium according to claim 1 , wherein
R 3 is vinyl or 1E-propenyl.
10. A Liquid crystal medium according to claim 1 , wherein
R 4 is methoxy.
11. A Liquid crystal medium according to claim 1 , wherein
R 5 is vinyl or 3-butenyl.
12. A liquid crystal medium according to claim 2 , which comprises
15 to 16% of two compounds of formula I,
2 to 4% of one compound of formula II,
17 to 19% of two compounds of formula III,
21 to 23% of two compounds of formula IV,
15 to 17% of two compounds of formula VI,
5 to 7% of one compound of formula VII, and
18 to 20% of three compounds of formula IX.
13. A liquid crystal medium according to claim 2 , which comprises
18 to 20% of three compounds of formula I,
15 to 17% of one compound of formula III,
20 to 22% of two compounds of formula IV,
4 to 6% of one compounds of formula V,
16 to 18% of two compounds of formula VI,
5 to 7% of one compound of formula VII, and
15 to 17% of two compounds of formula IX.
14. A liquid crystal medium according to claim 7 , which comprises
15 to 16% of two compounds of formula I,
2 to 4% of one compound of formula II,
17 to 19% of two compounds of formula III,
21 to 23% of two compounds of formula IV,
15 to 17% of two compounds of formula VI,
5 to 7% of one compound of formula VII, and
18 to 20% of three compounds of formula IX.
15. A liquid crystal medium according to claim 7 , which comprises
18 to 20% of three compounds of formula I,
15 to 17% of one compound of formula III,
20 to 22% of two compounds of formula IV,
4 to 6% of one compounds of formula V,
16 to 18% of two compounds of formula VI,
5 to 7% of one compound of formula VII, and
15 to 17% of two compounds of formula IX.
16. An electro-optical liquid crystal display, containing a liquid crystal medium according to claims 2 .
17. An electro-optical liquid crystal display, containing a liquid crystal medium according to claims 7 .
18. An electro-optical liquid crystal display, containing a liquid crystal medium according to claims 12 .
19. An electro-optical liquid crystal display, containing a liquid crystal medium according to claims 13 .