Liquid crystal composition, and element and device using the same
AssigneeShowa Shell Sekiyu Kabusyiki Kaisha
InventorsNobuhiro Okabe, Tadaaki Isozaki, Yoshiichi Suzuki
Life of this patent
Estimating the term…
Abstract
A liquid crystal composition is disclosed having antiferroelectric phases at two temperature ranges. A liquid crystal element and device using the liquid crystal composition are also disclosed.
Claims13
The liquid crystal composition having antiferroelectric phases at two temperature ranges comprising not less than 80 parts by weight of a compound represented by the general formula (III):
- ##STR20## wherein R.sub.1 is an alkyl group having from 4 to 18 carbon atoms, R.sub.2 is an alkyl group having from 4 to 18 carbon atoms, and * shows an asymmetric carbon atom, and less than 20 parts by weight of a compound represented by the general formula (IV):
- ##STR21## wherein R.sub.3 and R.sub.4 are independently selected from the group consisting of alkyl groups having from 4 to 18 carbon atoms, and * shows an asymmetric carbon atom, the compounds of formula (III) and formula (IV) having an optical purity of higher than 80% e.e., respectively;
- when the compound of the general formula (III) is an R-isomer, the compound of the general formula (IV) is also an R-isomer;
- and when the compound of the general formula (III) is an S-isomer, the compound of the general formula (IV) is also an S-isomer.
The liquid crystal composition comprises 80 to 40 parts by weight of a compound represented by the general formula (VII):
- ##STR25## wherein R.sub.1 and R.sub.2 are independently selected from the group consisting of alkyl groups having from 4 to 18 carbon atoms, and * shows an asymmetric carbon atom, and 20 to 60 parts by weight of a compound represented by the general formula (IV):
- ##STR26## wherein R.sub.3 and R.sub.4 are independently selected from the group consisting of alkyl groups having from 4 to 18 carbon atoms, and * shows an asymmetric carbon atom, the compounds having an optical purity of higher than 80% e.e., respectively;
- when the compound of the general formula (VII) is an R-isomer, the compound of the general formula (IV) also being an R-isomer;
- and when the compound of the general formula (VII) is an S-isomer, the compound of the general formula (IV) also being an S-isomer.
A liquid crystal element in which a liquid crystal composition is inserted between a pair of electrode substrates characterized in that the liquid crystal composition has an antiferroelectric phase in two temperature ranges.
Dependencies are inferred from the claim text.