Claims
- 1. An electro-optical cell containing a nematic composition which comprises a nematic compound of the formula ##STR14## wherein R is straight-chain alkyl of 1 to 8 carbon atoms, or mixtures thereof.
- 2. A nematic composition for electro-optical purposes, which comprises a compound of the formula ##STR15## wherein R is straight-chain alkyl of 1 to 8 carbon atoms, or mixtures thereof, and one or more other positive anisotropic nematic compounds.
- 3. A nematic composition in accordance with claim 2, which comprises a cinnamic acid ester of the formula ##STR16## wherein R is straight-chain alkyl of 1 to 8 carbon atoms, or mixtures thereof, and one or more compounds of the formula ##STR17## wherein R.sub.1 is straight-chain alkyl of 2 to 8 carbon atoms, straight-chain alkoxy of 4 to 7 carbon atoms, straight-chain alkanoyloxy of 2 to 8 carbon atoms or straight-chain alkylcarbonate of 2 to 11 carbon atoms.
- 4. A nematic composition in accordance with claim 2, which comprises a cinnamic acid ester of the formula ##STR18## wherein R is straight-chain alkyl of 1 to 8 carbon atoms, or mixtures thereof, and one or more compounds of the formula ##STR19## wherein R.sub.2 is straight-chain alkyl of 4 to 7 carbon atoms or straight-chain alkylcarbonate of 2 to 12 carbon atoms.
- 5. A nematic composition in accordance with claim 2, which comprises a cinnamic acid ester of the formula ##STR20## wherein R is straight-chain alkyl of 1 to 8 carbon atoms, or mixtures thereof, and one or more compounds of the formula ##STR21## wherein R.sub.3 is straight-chain alkyl of 4 to 8 carbon atoms, straight-chain alkoxy of 5 to 8 carbon atoms or straight-chain alkylcarbonate of 3 to 11 carbon atoms.
- 6. A nematic composition in accordance with claim 2, which comprises a cinnamic acid ester of the formula ##STR22## wherein R is straight-chain alkyl of 1 to 8 carbon atoms, or mixtures thereof, and one or more compounds of the formula ##STR23## wherein R.sub.4 is straight-chain alkyl, straight-chain alkoxy, straight-chain alkanoyloxy of 4 to 9 carbon atoms or straight-chain alkylcarbonate of 4 to 11 carbon atoms.
- 7. A nematic composition in accordance with claim 5, which comprises p-n-heptylcinnamic acid p'-cyanophenyl ester, p-n-hexylbenzoic acid p'-cyanophenyl ester and p-n-octylbenzoic acid p'-cyanophenyl ester.
- 8. A nematic composition in accordance with claim 5, which comprises p-n-heptylcinnamic acid p'-cyanophenyl ester, p-n-pentylbenzoic acid p'-cyanophenyl ester, p-n-heptylbenzoic acid p'-cyanophenyl ester and p-n-octylbenzoic acid p'-cyanophenyl ester.
- 9. A nematic composition in accordance with claim 5, which comprises p-n-heptylcinnamic acid p'-cyanophenyl ester, p-n-butylbenzoic acid p'-cyanophenyl ester, p-n-hexylbenzoic acid p'-cyanophenyl ester and p-n-heptylbenzoic acid p'-cyanophenyl ester.
- 10. A nematic composition in accordance with claim 5, which comprises p-n-heptylcinnamic acid p'-cyanophenyl ester, p-n-butylbenzoic acid p'-cyanophenyl ester, p-n-hexylbenzoic acid p'-cyanophenyl ester and p-n-octylbenzoic acid p'-cyanophenyl ester.
- 11. A nematic composition in accordance with claim 5, which comprises p-n-heptylcinnamic acid p'-cyanophenyl ester, p-n-hexylbenzoic acid p'-cyanophenyl ester, p-n-octylbenzoic acid p'-cyanophenyl ester and p-[(p-cyanophenoxy)carbonyl]phenyl n-hexyl carbonate.
- 12. A nematic composition in accordance with claim 5 which comprises p-n-heptylcinnamic acid p'-cyanophenyl ester, p-n-heptylbenzoic acid p'-cyanophenyl ester and p-[(p-cyano-phenoxy)carbonyl]phenyl n-hexyl carbonate.
- 13. A nematic composition in accordance with claim 2 which comprises p-n-heptylcinnamic acid p'-cyanophenyl ester, p-n-heptylbenzoic acid p'-cyanophenyl ester and 4'-n-pentyl-4-cyano-biphenyl.
- 14. A nematic composition in accordance with claim 2 which comprises p-n-heptylcinnamic acid p'-cyanophenyl ester, p-n-heptylbenzoic acid p'-cyanophenyl ester and 4'-heptyl-4-cyano-biphenyl.
- 15. A nematic composition in accordance with claim 2 which comprises p-n-heptylcinnamic acid p'-cyanophenyl ester, p-n-hexylbenzoic acid p'-cyanophenyl ester, p-n-octylbenzoic acid p'-cyanophenyl ester and p-[(p-n-heptylbenzyliden)amino]benzonitrile.
- 16. A nematic composition in accordance with claim 2 which comprises p-n-heptylcinnamic acid p'-cyanophenyl ester, p-n-heptylbenzoic acid p'-cyanophenyl ester and p-[(p-n-heptylbenzyliden)amino]benzonitrile.
- 17. A nematic composition in accordance with claim 2 which comprises p-n-heptylcinnamic acid p'-cyanophenyl ester, p-n-hexylbenzoic acid p'-cyanophenyl ester, p-n-octylbenzoic acid p'-cyanophenyl ester and p-methoxy-benzyliden-p'-n-butyl-aniline.
- 18. A nematic composition in accordance with claim 2 which comprises p-n-heptylcinnamic acid p'-cyanophenyl ester, p-n-heptylbenzoic acid p'-cyanophenyl ester and p-methoxy-benzyliden-p'-n-butyl-aniline.
- 19. A nematic composition in accordance with claim 2 which comprises p-n-hexylcinnamic acid p'-cyanophenyl ester, p-n-butylbenzoic acid p'-cyanophenyl ester, p-n-hexylbenzoic acid p'-cyanophenyl ester and p-n-octylbenzoic acid p'-cyanophenyl ester.
- 20. A nematic composition in accordance with claim 2 which comprises p-n-hexylbenzoic acid p'-cyanophenyl ester, p-n-octylbenzoic acid p'-cyanophenyl ester, p-n-hexyloxybenzoic acid p'-cyanophenyl ester and p-n-heptylcinnamic acid p'-cyanophenyl ester.
- 21. A nematic composition in accordance with claim 5 which comprises p-n-heptylbenzoic acid p'-cyanophenyl ester, p-n-heptylcinnamic acid p'-cyanophenyl ester and p-[(p-cyano-phenoxy)carbonyl]phenyl n-hexyl carbonate.
Priority Claims (1)
Number |
Date |
Country |
Kind |
17626/73 |
Dec 1973 |
CH |
|
Parent Case Info
This is a continuation of application Ser. No. 604,573, filed Aug. 14, 1975, which is a division of U.S. Pat. application Ser. No. 529,436, filed Dec. 4, 1974, now U.S. Pat. No. 3,927,066, issued Dec. 16, 1975.
US Referenced Citations (8)
Foreign Referenced Citations (2)
Number |
Date |
Country |
2,321,632 |
Nov 1974 |
DT |
2,234,522 |
Jan 1973 |
DT |
Non-Patent Literature Citations (1)
Entry |
Gray, G. W., et al., Liquid Crystals & Plastic Crystals, vol. 1, John Wiley & Sons, Inc., N. Y., pp. 103-125 (1/74). |
Divisions (1)
|
Number |
Date |
Country |
Parent |
529436 |
Dec 1974 |
|
Continuations (1)
|
Number |
Date |
Country |
Parent |
604573 |
Aug 1975 |
|