Claims
- 1. A nematic composition which comprises two or more compounds of the formula ##STR11## wherein R is ethyl, n-propyl, n-butyl, n-pentyl, isohexyl, n-hexyl, n-heptyl or n-octyl.
- 2. A nematic composition in accordance with claim 1, which comprises a mixture of p-[(p-ethylbenzyliden)amino]-benzonitrile and p-[(p-n-hexylbenzyliden)amino]benzonitrile.
- 3. A nematic composition in accordance with claim 1, which comprises a mixture of p-[(p-n-propylbenzyliden)amion]-benzonitrile and p-[(p-n-hexylbenzyliden)amino]benzonitrile.
- 4. A nematic composition in accordance with claim 1, which comprises a mixture of one part of p-[(p-n-propylbenzyliden)amino]-benzonitrile and two parts of p-[(p-n-hexylbenzyliden)amino]benzonitrile.
- 5. A nematic composition in accordance with claim 1, which comprises a mixture of p-[(p-n-butylbenzyliden)amino]-benzonitrile and p-[(p-n-hexylbenzyliden)amino]benzonitrile.
- 6. A nematic composition in accordance with claim 1, which comprises a mixture of p-[(p-n-pentylbenzyliden)amino]-benzonitrile and p-[(p-n-hexylbenzyliden)amino]benzonitrile.
- 7. A nematic composition in accordance with claim 1, which comprises a mixture of p-[(p-n-heptylbenzyliden)amino]-benzonitrile and p-[(p-n-hexylbenzyliden)amino]benzonitrile.
- 8. A nematic composition in accordance with claim 1, which comprises a mixture of p-[(p-n-octylbenzyliden)amino]-benzonitrile and p-[(p-n-hexylbenzyliden)amino]benzonitrile.
- 9. A nematic composition in accordance with claim 1, which comprises a mixture of p-[(p-n-propylbenzyliden)amino]benzonitrile and p-[(p-n-heptylbenzyliden)amino]benzonitrile.
- 10. A nematic composition in accordance with claim 1, which comprises a mixture of p-[(p-n-butylbenzyliden)amino]benzonitrile and p-[(p-n-heptylbenzyliden)amino]benzonitrile.
- 11. A nematic composition in accordance with claim 1, which comprises a mixture of p-[(p-n-pentylbenzyliden)amino]benzonitrile and p-[(p-n-heptylbenzyliden)amino]benzonitrile.
- 12. A nematic composition in accordance with claim 1, which comprises a mixture of p-[(p-n-propylbenzyliden)amino]benzonitrile and p-[(p-n-octylbenzyliden)amino]benzonitrile.
- 13. A nematic composition in accordance with claim 1, which comprises a mixture of p-[(p-n-butylbenzyliden)amino]benzonitrile and p-[(p-n-octylbenzyliden)amino]benzonitrile.
- 14. A nematic composition in accordance with claim 1, which comprises a mixture of p-[(p-n-pentylbenzyliden)amino]benzonitrile and p-[(p-n-octylbenzyliden)amino]benzonitrile.
- 15. A nematic composition which comprises a Schiffs' base of the formula ##STR12## wherein R is ethyl, n-propyl, n-butyl, n-pentyl, n-hexyl, isohexyl, n-heptyl or n-octyl,
- or mixtures thereof and one or more nematic compounds having a positive anisotropy.
- 16. A nematic composition which comprises a compound of the formula ##STR13## wherein R is ethyl, n-propyl, n-butyl, n-pentyl, n-hexyl, isohexyl, n-heptyl or n-octyl,
- or mixtures thereof, and a compound of the formula ##STR14## wherein R.sub.1 is straight-chain lower alkyl of 4 to 7 carbon atoms.
- 17. A nematic composition which comprises a compound of the formula ##STR15## wherein R is ethyl, n-propyl, n-butyl, n-pentyl, n-hexyl, isohexyl, n-heptyl or n-octyl,
- or mixtures thereof, and a compound of the formula ##STR16## wherein R.sub.2 is straight-chain lower alkyl of 4 to 7 carbon atoms or straight-chain lower alkanoyl of 2 to 8 carbon atoms.
- 18. A nematic composition which comprises a compound of the formula ##STR17## wherein R is ethyl, n-propyl, n-butyl, n-pentyl, n-hexyl, isohexyl, n-heptyl or n-octyl,
- or mixtures thereof, and a compound of the formula ##STR18## wherein R.sub.2 is straight-chain lower alkyl of 4 to 8 carbon atoms or straight-chain lower alkoxy of 5 to 8 carbon atoms.
- 19. A nematic composition in accordance with claim 16, wherein the compound of formula I is p-[(p-n-hexylbenzyliden)amino]benzonitrile.
- 20. A nematic composition in accordance with claim 17, wherein the compound of formula I is p-[(p-n-hexylbenzyliden)amino]benzonitrile.
- 21. A nematic composition in accordance with claim 18, wherein the compound of formula I is p-[(p-n-hexylbenzyliden)amino]benzonitrile.
- 22. A dielectric for electro-optical purposes, which comprises a nematic Schiffs' base of the formula ##STR19## wherein R is ethyl, n-propyl, n-butyl, n-pentyl, isohexyl, n-hexyl, n-heptyl or n-octyl,
- or mixtures thereof and one or more nematic compounds having positive anisotropy.
Priority Claims (2)
Number |
Date |
Country |
Kind |
2585/72 |
Feb 1972 |
CH |
|
355/73 |
Jan 1973 |
CH |
|
CROSS-REFERENCE TO RELATED APPLICATIONS
This application is a division of U.S. Pat. application Ser. No. 334,292, filed Feb. 21, 1973, now U.S. Pat. No. 3,927,064.
US Referenced Citations (8)
Foreign Referenced Citations (3)
Number |
Date |
Country |
2,024,269 |
Dec 1971 |
DT |
2,234,522 |
Jan 1973 |
DT |
4,962,390 |
Jun 1974 |
JA |
Non-Patent Literature Citations (3)
Entry |
Boller, A., et al., Proc. of the IEEE, pp. 1002-1003 (Aug. 1972). |
Castellano et al., J. Org. Chem., vol. 33, pp. 3501-3504 (1968). |
Schadt, M., J. Chem. Phys., vol. 56, No. 4, pp. 1494-1497, (2/15/72). |
Divisions (1)
|
Number |
Date |
Country |
Parent |
334292 |
Feb 1973 |
|