Claims
- 1. A nematic composition which comprises two or more compounds of the formula ##STR40## wherein X is ##STR41## and R is straight-chain alkyl of 1-7 carbon atoms, straight-chain alkoxy of 1-7 carbon atoms, straight-chain alkanoyloxy of 1-7 carbon atoms or p-alkyloxycarbonyloxy wherein the alkyloxy group is straight-chain alkyloxy of 1-7 carbon atoms.
- 2. A nematic composition which comprises a compound of the formula ##STR42## wherein X is ##STR43## and R is straight-chain alkyl of 1-7 carbon atoms, straight-chain alkoxy of 1-7 carbon atoms, straight-chain alkanoyloxy of 1-7 carbon atoms or p-alkyloxycarbonyloxy wherein the alkyloxy group is straight-chain alkyloxy of 1-7 carbon atoms,
- or mixtures thereof and one or more nematic compounds having a positive anisotropy.
- 3. A nematic composition which comprises a compound of the formula ##STR44## wherein X is ##STR45## and R is straight-chain alkyl of 1-7 carbon atoms, straight-chain alkoxy of 1-7 carbon atoms, straight-chain alkanoyloxy of 1-7 carbon atoms or p-alkyl-oxycarboxyloxy wherein the alkyloxy group is straight-chain alkyloxy of 1-7 carbon atoms,
- or mixtures thereof, and a compound of the formula ##STR46## wherein R.sub.2 is straight-chain alkyl with 4 to 7 carbon atoms.
- 4. A nematic composition which comprises a compound of the formula ##STR47## wherein X is ##STR48## and R is straight-chain alkyl of 1-7 carbon atoms, straight-chain alkoxy of 1-7 carbon atoms, straight-chain alkanoyloxy of 1-7 carbon atoms or p-alkyl-oxycarbonyloxy wherein the alkoxy group is straight-chain alkyloxy of 1-7 carbon atoms,
- or mixtures thereof, and a compound of the formula ##STR49## wherein R.sub.1 is straight-chain alkyl with 2 to 8 carbon atoms, straight-chain alkoxy with 4 to 7 carbon atoms or straight-chain alkanoyloxy with 2 to 8 carbon atoms.
- 5. A nematic composition which comprises a compound of the formula ##STR50## wherein X is ##STR51## and R is straight-chain alkyl of 1-7 carbon atoms, straight-chain alkoxy of 1-7 carbon atoms, straight-chain alkanoyloxy of 1-7 carbon atoms or p-alkyloxycarbonyloxy wherein the alkyloxy group is straight-chain alkyloxy of 1-7 carbon atoms,
- or mixtures thereof, and a compound of the formula ##STR52## wherein R.sub.3 is straight-chain alkyl with 4 to 8 carbon atoms or straight-chain alkoxy with 5 to 8 carbon atoms.
- 6. A dielectric for electro-optical purposes, which comprises a compound of the formula ##STR53## wherein X is ##STR54## and R is straight-chain alkyl of 1-7 carbon atoms, straight-chain alkoxy of 1-7 carbon atoms, straight-chain alkanoyloxy of 1-7 carbon atoms or p-alkyloxycarbonyloxy wherein the alkyloxy group is straight-chain alkyloxy of 1-7 carbon atoms,
- or mixtures thereof and one or more nematic compounds having a positive anisotropy.
Priority Claims (1)
Number |
Date |
Country |
Kind |
3099/73 |
Mar 1973 |
CH |
|
Parent Case Info
This is a division of application Ser. No. 444,923, filed Feb. 22, 1974, now U.S. Pat. No. 3,925,444, issued Dec. 9, 1975.
US Referenced Citations (6)
Foreign Referenced Citations (3)
Number |
Date |
Country |
2,306,739 |
Aug 1973 |
DT |
2,306,738 |
Aug 1973 |
DT |
2,024,269 |
Dec 1971 |
DT |
Divisions (1)
|
Number |
Date |
Country |
Parent |
444923 |
Feb 1974 |
|