Claims
- 1. A twisted liquid crystal phase containing at least one chiral compound, which contains at least one chiral compound of the formula (I) ##STR14## in which the symbols have the following meanings: n denotes 0 or 1,
- R.sup.1 denotes a straight-chain or branched (C.sub.1 -C.sub.4)alkyl which is unsubstituted or substituted by fluorine,
- R.sup.2 denotes unsubstituted or substituted (C.sub.6 -C.sub.18)aryl, or cyclo (C.sub.5 -C.sub.12)alkyl and
- MC denotes a molecular radical of a mesogenic monocarboxylic acid MC-OH after elimination of an OH group where n=0, and denotes a molecular radical of a mesogenic dicarboxylic acid HO-MC-OH after elimination of two OH groups where n=1, with the exception of compounds in which n denotes 0, R.sup.1 denotes CH.sub.3, R.sup.2 denotes phenyl and MC denotes ##STR15##
- 2. A liquid crystal phase as claimed in claim 1, which contains 0.01 to 70% by weight of at least one of the chiral compounds.
- 3. A liquid crystal display element containing a liquid crystal phase as claimed in claim 1.
- 4. A method for temperature compensation and for producing a large twist in liquid crystal display elements which contain a liquid crystal phase, which comprises adding to the liquid crystal phase 0.01 to 70% by weight of at least one compound of the formula (I) ##STR16## in which the symbols have the following meanings: n denotes 0 or 1,
- R.sup.1 denotes a straight-chain or branched (C.sub.1 -C.sub.4)alkyl which is unsubstituted or substituted by fluorine,
- R.sup.2 denotes unsubstituted or substituted (C.sub.6 -C.sub.18)aryl, or cyclo(C.sub.5 -C.sub.12)alkyl, and
- MC denotes a molecular radical of a mesogenic monocarboxylic acid MC-OH after elimination of an OH group where n=0, and denotes a molecular radical of a mesogenic dicarboxylic acid HO-MC-OH after elimination of two OH groups where n=1, with the exception of compounds in which n denotes 0, R.sup.1 denotes CH.sub.3, R.sup.2 denotes phenyl and MC denotes ##STR17##
Priority Claims (1)
Number |
Date |
Country |
Kind |
3534778 |
Sep 1985 |
DEX |
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Parent Case Info
This application is a division of application Ser. No. 912,790, filed Sept. 26, 1986, now U.S. Pat. No. 4,939,287.
US Referenced Citations (1)
Number |
Name |
Date |
Kind |
4264148 |
Golbe-Wunsch et al. |
Apr 1981 |
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Divisions (1)
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Number |
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Parent |
912790 |
Sep 1986 |
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