P-terphenyl derivatives and liquid crystalline compositions
AssigneeKanto Kagaku Kabushiki Kaisha
InventorsMakoto Kurihara, Hiromi Inoue, Atsushi Sugiura, Kenji Suzuki, Tsunenori Fujii
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Abstract
The p-terphenyl derivatives of the formula shown below are useful in preparing practical ferroelectric liquid crystalline compositions. The derivatives exhibit excellent chemical stability and display the chiral smectic C or smectic C phase over a wide temperature range. ##STR1## wherein each of R.sub.1 and R.sub.2 is a straight or branched chain alkyl group having 1-18 carbon atoms; each of Y and Z is a single bond, O, COO or OCO; and any two of X.sub.1, X.sub.2, and X.sub.3 are fluorine atoms and the remainder is a hydrogen atom.
Claims4
A p-terphenyl derivative wherein said derivative is represented by the formula:
- ##STR20## wherein R.sup.1 is a straight or branched chain alkyl group having 4-18 carbon atoms and R.sup.2 is a straight or branched chain alkyl group having 3-18 carbon atoms;
- each of Y and Z is selected from the group consisting of a single bond, O, COO and OCO;
- wherein said derivative exhibits a chiral smectic C phase or a smectic C phase over at least about a 10.degree. C. temperature range.
Dependencies are inferred from the claim text.