Biphenyl compound
AssigneeKanto Kagaku Kabushiki Kaisha
InventorsKazuhiko Tsuchiya, Kenji Suzuki, Atsushi Sugiura, Tsunenori Fujii
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Abstract
A new biphenyl compound which is chemically stable and possesses practically excellent properties as a component for preparing ferroelectric smetic liquid crystalline compositions as well as a new liquid crystalline composition containing this compound.
Claims8
An optically active biphenyl compound for use in liquid crystal mixtures having a broad chiral smectic C phase at about room temperature and having the formula:
- ##STR84## wherein R* is an alkyl group having an asymmetric carbon atom and 4-14 carbon atoms, any one or two of X.sub.1, X.sub.2, X.sub.3 and X.sub.4 is/are a fluorine or chlorine atom/atoms and the others are hydrogen atoms, and Y is OR or OCOR where R is an alkyl group with 3-14 carbon atoms.
A liquid crystalline composition containing at least one optically active biphenyl compound having a liquid crystalline phase and a broad chiral smectic C phase at about room temperature and having the formula:
- ##STR85## wherein R* is an alkyl group having an asymmetric carbon atom and 4-14 carbon atoms, any one or two of X.sub.1, X.sub.2, X.sub.3 and X.sub.4 is/are a fluorine or chlorine atom/atoms and the others are hydrogen atoms, and Y is OR or OCOR where R is an alkyl group with 3-14 carbon atoms.
A liquid crystal display element comprising a liquid crystalline composition containing a mixture of at least two optically active biphenyl compounds having a liquid crystalline phase and a broad chiral smectic C phase at about room temperature and having the formula ##STR86## wherein R* is an alkyl group having an asymmetric carbon atom and 4-14 carbon atoms, any one or two of X.sub.1, X.sub.2, X.sub.3, and X.sub.4 is/are a fluorine or chlorine atom/atoms and the others are hydrogen atoms, and Y is OR or OCOR where R is an alkyl group with 3-14 carbon atoms.
Dependencies are inferred from the claim text.