Claims
- 1. A chiral smectic liquid crystal composition, comprising:
- at least one mesomorphic compound which is free from an asymmetric carbon atom and is optically inactive, represented by the formula (1) below: ##STR56## wherein R.sub.1 denotes an alkyl group having 1-16 carbon atoms; R.sub.2 denotes a substituted or unsubstituted alkyl group, alkoxy group, alkoxycarbonyl group, acyloxy group or alkoxycarbonyloxy group each having 1-16 carbon atoms, the substituent of the substituted R.sub.2 group being alkyl, alkoxy, alkoxycarbonyl, Cl or F; wherein ##STR57## may have a substituent of CN or F; and at least one mesomorphic compound represented by the formula (5) below: ##STR58## wherein R.sub.5 denotes an alkyl group or alkoxy group each having 1-16 carbon atoms, and R.sub.6 denotes an alkyl group, alkoxy group, acyloxy group, alkoxycarbonyl group or alkoxycarbonyloxy group each having 1-16 carbon atoms, which may have a substituent of Cl or F; wherein the mesomorphic compound represented by the formula (5) is free from an asymmetric carbon atom and is optically inactive.
- 2. A composition according to claim 1, which further contains at least one mesomorphic compound represented by the following formula (7): ##STR59##
- 3. A composition according to claim 1, which comprises 1-500 wt. parts in combination of the compounds of the formulae (1) and (5) and 100 wt. parts of another liquid crystal material.
- 4. A composition according to claim 1, which comprises 50-400 wt. parts in combination of the compounds of the formulae (1) and (5) and 100 wt. parts of another liquid crystal material.
- 5. A liquid crystal device, comprising a pair of electrode plates and a ferroelectric chiral smectic liquid crystal composition according to claim 1 disposed between the electrode plates.
- 6. A device according to claim 5, wherein said ferroelectric chiral smectic liquid crystal composition shows a phase transition series of isotropic phase, cholesteric phase, smectic A phase and chiral smectic C phase.
- 7. A device according to claim 5, wherein at least one of the electrode plates has a face having a function of aligning the axis of liquid crystal molecules preferentially in one direction.
Priority Claims (3)
Number |
Date |
Country |
Kind |
62-140645 |
Jun 1987 |
JPX |
|
62-142023 |
Jun 1987 |
JPX |
|
63-132152 |
May 1988 |
JPX |
|
Parent Case Info
This application is a division of application Ser. No. 07/980,116, filed Nov. 23, 1992, U.S. Pat. No. 5,389,296, which is a continuation of application Ser. No. 07/201,183, filed Jun. 2, 1988, now abandoned.
US Referenced Citations (7)
Foreign Referenced Citations (8)
Number |
Date |
Country |
0025119 |
Mar 1981 |
EPX |
0035155 |
Sep 1981 |
EPX |
0240356 |
Oct 1986 |
DDX |
3518734 |
Nov 1986 |
DEX |
0197680 |
Sep 1986 |
JPX |
2175409 |
Nov 1986 |
GBX |
2181429 |
Apr 1987 |
GBX |
0001717 |
Mar 1987 |
WOX |
Non-Patent Literature Citations (3)
Entry |
Patent Abstracts of Japan, vol. 11, No. 297 (C-448) Sep. 1987 (62-089669). |
Patent Abstracts of Japan, vol. 12, No. 365 (C-532) Sep. 1988 (63-119473). |
Patent Abstracts of Japan, vol. 12, No. 306 (C-522) Aug. 1988 (63-077864). |
Divisions (1)
|
Number |
Date |
Country |
Parent |
980116 |
Nov 1992 |
|
Continuations (1)
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Number |
Date |
Country |
Parent |
201183 |
Jun 1988 |
|