Claims
- 1. 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.
- 2. The biphenyl compound according to claim 1, wherein any one or two of X.sub.1, X.sub.2, X.sub.3 and X.sub.4 in the above formula (I) is/are a fluorine atom/atoms and the others are hydrogen atoms.
- 3. The biphenyl compound according to claim 1, wherein any one or two of X.sub.1, X.sub.2, X.sub.3 and X.sub.4 in the above formula (I) is/are a chlorine atom/atoms and the others are hydrogen atoms.
- 4. 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.
- 5. The liquid crystalline composition according to claim 4, wherein any one or two of X.sub.1, X.sub.2, X.sub.3 and X.sub.4 in the above formula (I) is/are a fluorine atom/atoms and the others are hydrogen atoms.
- 6. The liquid crystalline composition according to claim 4, wherein any one or two of X.sub.1, X.sub.2, X.sub.3 and X.sub.4 in the above formula (I) is/are a chlorine atom/atoms and the others are hydrogen atoms.
- 7. 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.
- 8. The liquid crystal display element according to claim 7 comprising a liquid crystalline composition containing a mixture of (s)-4-decyloxy-3'-fluoro-4'-(4"-methylhexyl)oxybiphenyl and (s)-3-fluoro-4-(4" methylhexyl)oxy-4'-heptanoyloxybiphenyl or (s)-3-chloro-4-(4" methylhexyl)oxy-4'-dodecanoyloxy biphenyl.
Priority Claims (2)
Number |
Date |
Country |
Kind |
62-131545 |
May 1987 |
JPX |
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62-312309 |
Dec 1987 |
JPX |
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Parent Case Info
This application is a continuation of application Ser. No. 07/830,521, filed on Feb. 3, 1992, now abandoned, which is a continuation of application Ser. No. 07/306,452, filed on Jan. 27, 1989, now abandoned.
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Continuations (2)
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Number |
Date |
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Parent |
830521 |
Feb 1992 |
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Parent |
306452 |
Jan 1989 |
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