Claims
- 1. A nematic mixture for electro-optical purposes which comprises two or more compounds of the formula ##STR20## wherein one of R.sub.1 and R.sub.2 is cyano and the other is straight-chain alkyl of 3 to 9 carbon atoms, straight-chain alkoxy of 2 to 9 carbon atoms or straight-chain alkanoyloxy of 2 to 9 carbon atoms.
- 2. A nematic mixture for electro-optical purposes which comprises one or more compounds of the formula ##STR21## wherein one of R.sub.1 and R.sub.2 is cyano and the other is straight-chain alkyl of 3 to 9 carbon atoms, straight-chain alkoxy of 2 to 9 cabon atoms or straight-chain alkanoyloxy of 2 to 9 carbon atoms,
- and one or more nematic substances.
- 3. A nematic mixture in accordance with claim 2 which comprises a compound of the formula ##STR22## wherein one of R.sub.1 and R.sub.2 is cyano and the other is straight-chain alkyl of 3 to 9 carbon atoms, straight-chain alkoxy of 2 to 9 carbon atoms or straight-chain alkanoyloxy of 2 to 9 carbon atoms,
- or mixtures thereof and a compound of the formula ##STR23## wherein R.sub.7 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 straght-chain alkylcarbonate of 2 to 11 carbon atoms,
- or mixtures thereof.
- 4. A nematic mixture in accordance with claim 2 which comprises a compound of the formula ##STR24## wherein one of R.sub.1 and R.sub.2 is cyano and the other is straight-chain alkyl of 3 to 9 carbon atoms, straightchain alkoxy of 2 to 9 carbon atoms or straight-chain alkanoyloxy of 2 to straight-chain 9 carbon atoms,
- or mixtures thereof and a compound of the formula ##STR25## wherein R.sub.8 is straight-chain alkyl of 4 to 7 carbon atoms or straight-chain alkylcarbonate of 2 to 11 carbon atoms,
- or mixtures thereof.
- 5. A nematic mixture in accordance with claim 2 which comprises a compound of the formula ##STR26## wherein one of R.sub.1 and R.sub.2 is cyano and the other is straight-chain alkyl of 3 to 9 carbon atoms, straight-chain alkoxy of 2 to 9 carbon atoms or straight-chain alkanoyloxy of 2 to 9 carbon atoms,
- or mixtures thereof and a compound of the formula ##STR27## wherein Z is cyano and R.sub.9 is straight-chain alkyl of 4 to 8 carbon atoms, straight-chain alkoxy of 5 to 8 carbon atoms, straight-chain alkanoyloxy of 2 to 8 carbon atoms or straight-chain alkylcarbonate of 3 to 11 carbon atoms,
- or mixtures thereof.
- 6. A nematic mixture in accordance with claim 2 which comprises a compound of the formula ##STR28## wherein one of R.sub.1 and R.sub.2 is cyano and the other is straight-chain alkyl of 3 to 9 carbon atoms, straight-chain alkoxy of 2 to 9 carbon atoms or straight-chain alkanoyloxy of 2 to 9 carbon atoms,
- or mixtures thereof and a compound of the formula ##STR29## wherein R.sub.10 is straight-chain alkyl of 5 to 7 carbon atoms straight-chain alkoxy of 5 to 7 carbon atoms, straight-chain alkanoyloxy of 4 to 9 carbon atoms or straight-chain alkylcarbonate of 4 to 11 carbon atoms,
- or mixtures thereof.
- 7. A nematic mixture in accordance with claim 2 which comprises a compound of the formula ##STR30## wherein one of R.sub.1 and R.sub.2 is cyano and the other is straight-chain alkyl of 3 to 9 carbon atoms, straight-chain alkoxy of 2 to 9 carbon atoms or straight-chain alkanoyloxy of 2 to 9 carbon atoms,
- or mixtures thereof and a compound of the formula ##STR31## wherein R.sub.11 is straight-chain alkyl of 1 to 8 carbon atoms, or mixtures thereof.
- 8. A nematic mixture in accordance with claim 2 which comprises a compound of the formula ##STR32## wherein one of R.sub.1 and R.sub.2 is cyano and the other is straight-chain alkyl of 3 to 9 carbon atoms, straight-chain alkoxy of 2 to 9 carbon atoms or straight-chain alkanoyloxy of 2 to 9 carbon atoms,
- or mixtures thereof and a compound of the formula ##STR33## wherein R.sub.12 and R.sub.13 each are straight-chain alkyl of 1 to 10 carbon atoms, straight-chain alkoxy of 1 to 10 carbon atoms, straight-chain alkanoyloxy of 2 to 11 carbon atoms or straight-chain alkylcarbonate of 2 to 11 carbon atoms and R.sub.14 is chlorine, bromine, methyl, acetyl or methoxycarbonyl,
- or mixtures thereof.
- 9. A nemantic mixture in accordance with claim 2 which comprises 5-n-pentyl-2-(4-cyanophenyl)-pyrimidine, p-n-hexylbenzoic acid p'-cyanophenyl ester and p-n-octylbenzoic acid p'-cyanophenyl ester.
- 10. A nemantic mixture in accordance with claim 2 which comprises 5-n-hexyl-2-(4-cyanophenyl)-pyrimidine, p-n-hexylbenzoic acid p'-cyanophenyl ester and p-n-octylbenzoic acid p'-cyanophenyl ester.
- 11. A nematic mixture in accordance with claim 2 which comprises 5-n-hexyl-2-(4-cyanophenyl)-pyrimidine, 4'-n-heptyl-4-cyanobiphenyl and 4'-n-penyl-4-cyanobiphenyl.
- 12. A nematic mixture in accordance with claim 1 which comprises 5-n-pentyl-2-(4-cyanophenyl)-pyrimidine and 5-n-heptyl-2-(4-cyanophenyl)-pyrimidine.
- 13. A nematic mixture in accordance with claim 2 which comprises 5-n-heptyl-2-(-cyanophenyl)-pyrimidine, -cyanophenyl)-pyrimidine, p-n-hexanoyloxybenzoic acid p'-ethoxyphenyl ester, p-n-hexylbenzoic acid p'-cyanophenyl ester and p-n-octylbenzoic acid p'-cyanophenyl ester.
- 14. A nematic mixture in accordance with claim 2 which comprises 5-n-heptyl-2-(4-yanophenyl)-pyrimidine, p-n-hexylbenzoic acid p'-cyanophenyl ester, p-n-octylbenzoic acid p'-cyanophenyl ester and methylhydroquinone di-(p-n-butylbenzoate).
- 15. A nematic mixture in accordance with claim 2 which comprises 5-n-heptyl-2-(4-cyanophenyl)-pyrimidine, 5-n-pentyl-2-(4-cyanophenyl)-pyrimidine and 4'-n-heptyl-4-cyanobiphenyl.
- 16. A nematic mixture in accordance withh claim 2 which comprises 4'-n-pentyl-4-cyanobiphenyl, 4'-n-heptyl-4-cyanobiphenyl and 5-cyano-2-(4-n-butyloxyphenyl)-pyrimidine.
- 17. A nematic mixture in accordance with claim 2 which comprises 4'-n-pentyl-4-cyanobiphenyl, 4'-n-heptyl-4-cyanobiphenyl and 5-cyano-2-(4-n-pentylphenyl)-pyrimidine.
- 18. A nematic mixture in accordance with claim 2 which comprises 4'-n-pentyl-4-cyanobiphenyl, 4'-n-heptyl-4-cyanobiphenyl and 5-cyano-2-(4-n-hexylphenyl)-pyrimidine.
- 19. A nemantic mixture in accordance with claim 2 which comprises 4'-n-pentyl-4-cyanobiphenyl, 4'-n-heptyl-4-cyanobiphenyl, 5-cyano-2-(4-n-pentyloxyphenyl)-pyrimidine and 5-cyano-2-(4-n-hexylphenyl)-pyrimidine.
- 20. A nematic mixture in accordance with claim 2 which comprises 4'-n-pentyl-4-cyanobiphenyl, 4'-n-heptyl-4-cyanobiphenyl, 5-cyano-2-(4-n-butylphenyl)-pyrimidine, 5-cyano-2-(4-n-pentylphenyl)-pyrimidine and 5-cyano-2-(4-n-hexylphenyl)-pyrimidine.
- 21. A nematic mixture in accordance with claim 2 which comprises 4'-n-pentyl-4-cyanobiphenyl, 4'-n-heptyl-4-cyanobiphenyl, 5-cyano-2-(4-n-butylphenyl)-pyrimidine, 5-cyano-2-(4-n-hexylphenyl)-pyrimidine and 5-cyano-2-(4-n-pentyloxyphenyl)-pyrimidine.
- 22. A nematic mixture in accordance with claim 2 which comprises 4'-n-pentyl-4-cyanobiophenyl, 4'-n-heptyl-4-cyanobiphenyl, 4'-n-heptyloxy-4-cyanobiphenyl, 4'-n-octyloxy-4-cyanobiphenyl, 5-cyano-2-(4-n-pentylphenyl)-pyrimidine and 5-cyano-2-(4-n-butyloxyphenyl)-pyrimidine.
- 23. A nematic mixture in accordance with claim 2 which comprises p-[(p-n-propylbenzylidene)amino] -benzonitrile, p-[(p-n-butylbenzylidene)amino]-benzonitrile, p-[(p-n-hexylbenzylidene)amino]-benzonitrile, 5-cyano-2-(4-n-propylphenyl)-pyrimidine, 5-cyano-2-(4-n-butylphenyl)-pyrimidine, 5-cyano-2-(4-n-pentylphenyl)-pyrimidine, 5-cyano-2-(4-n-hexylphenyl)-pyrimidine and 5-cyano-2-(4-n-heptylphenyl)-pyridine.
- 24. An optical cell comprising a liquid crystal means comprising one or more compounds selected from the group consisting of compounds of the formula ##STR34## wherein one of R.sub.1 and R.sub.2 is cyano and the other is straight-chain alkyl of 3 to 9 carbon atoms, straight-chain alkoxy of 2 to 9 carbon atoms or straight-chain alkanoyloxy of 2 to 9 carbon atoms,
- in the liquid crystalline state disposed between two plate means at least one of which plate means is transparent; means for controlling the optical activity of the cell; and said liquid crystal means having a helical structure in the direction perpendicular to the plate means and the surfaces of the plate means being wall oriented.
- 25. An optical cell comprising a liquid crystal means comprising one or more compounds selected from the group consisting of compounds of the formula ##STR35## wherein one of R.sub.1 and R.sub.2 is cyano and the other is straight-chain alkyl of 3 to 9 carbon atoms, straight-chain alkoxy of 2 to 9 carbon atoms or straight-chain alkanoyloxy of 2 to 9 carbon atoms, in the liquid crystalline state, and one or more nematic substances
- disposed between two plate means at least one of which plate means is transparent; means for controlling the optical activity of the cell; and said liquid crystal means having a helical structure in the direction perpendicular to the plate means and the surfaces of the plate means being wall oriented.
Priority Claims (1)
Number |
Date |
Country |
Kind |
14313/74 |
Oct 1974 |
CH |
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Parent Case Info
This is a division, of application Ser. No. 624,354 filed Oct. 21, 1975, now U.S. Pat. No. 3,997,536.
US Referenced Citations (6)
Foreign Referenced Citations (4)
Number |
Date |
Country |
2,252,132 |
Jun 1975 |
FR |
2,257,588 |
Jun 1973 |
DT |
2,502,904 |
Jul 1975 |
DT |
50-23385 |
Mar 1975 |
JA |
Non-Patent Literature Citations (2)
Entry |
Usol'Tseva, V. A. et al., Russ. Chem. Rev., vol. 32, No. 9, pp. 495-507 (Sept. 1963). |
Gray, G. W. et al., Liquid Crystals & Plastic Crystals, vol. 1, John Wiley & Sons, Inc., pp. 103-142 (Jan. 1974). |
Divisions (1)
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Number |
Date |
Country |
Parent |
624354 |
Oct 1975 |
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