Claims
- 1. An optically active dopant suitable for inclusion in a ferroelectric smectic liquid crystal mixture, said dopant having the structure ##STR81## in which X is a group having the formula: ##STR82## where R is selected from hydrogen, or C.sub.1-12 alkyl or alkoxy, each of the rings D is the same or different and are independently selected from phenyl and halogen substituted phenyl, A is selected from phenyl, halogen and substituted phenyl and trans-cyclohexyl, d is 0 to 1, and B is selected from C.sub.1-12 straight chain or branched chain alkyl and alkyl alicyclic.
- 2. The optically active dopant according to claim 1 where X is ##STR83##
- 3. The optically active dopant according to claim 2 where B is: ##STR84## where t is 0 and an integer 1-6, and n and m are the same or different and have values 1-6.
- 4. The optically active dopant according to claim 2 where B is straight chain alkyl.
- 5. The optically active dopant according to claim 4 where said straight chain alkyl is CH.sub.3.
- 6. The optically active dopant according to claim 2 where B is ##STR85## .
- 7. The optically active dopant according to claim 1 having the structure ##STR86## where t is 0 or an integer 1-6, and n and m are the same or different and have values 1-6.
- 8. A ferroelectric smectic liquid crystal material being a mixture of at least two compounds where at least one compound is a compound according to claim 1 and the other compound selected from: ##STR87## where R.sup.A and R.sup.B are independently C.sub.1-12 n-alkyl or n-alkoxy or an optically active alkyl or alkoxy group.
- 9. A ferroelectric smectic liquid crystal material being a mixture of at least two compounds where at least one compound is a compound according to claim 1 and the other compound has the formula: ##STR88## where R.sup.A and R.sup.B are independently C.sub.1-12 n-alkyl or n-alkoxy.
Priority Claims (1)
Number |
Date |
Country |
Kind |
8615316 |
Jun 1986 |
GBX |
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Parent Case Info
This is a continuation of application Ser. No. 07/734,105, filed Jul. 24, 1991, now abandoned, which is a continuation of Ser. No. 07/305,730 filed Feb. 1, 1989, now abandoned.
US Referenced Citations (6)
Foreign Referenced Citations (1)
Number |
Date |
Country |
61-243055 |
Oct 1986 |
JPX |
Continuations (2)
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Number |
Date |
Country |
Parent |
734105 |
Jul 1991 |
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Parent |
305730 |
Feb 1989 |
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