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US 2004/0164276 A1Published application
1,4-Di-(trans-4-cyclohexyl)benzene derivatives and their use in liquid crystal media and liquid crystal devices
AssigneeMerck Patent GmbH
InventorsHarald Hirschmann, Martina Weidner, Sven Schuepfer, Renate Graulich, Mark John Goulding, Martin Heeney, Warren Duffy
Life of this patent
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Abstract
Liquid-crystalline media comprising one or more compounds of the formula I 1 in which Ra, Rb, L and r are as defined herein, are suitable for use in, for example, TN and STN liquid crystal displays
Claims17
A liquid-crystalline medium, comprising two or more liquid crystal compounds wherein at least one compound is of formula I
- 66
- wherein
- Ra is an alkenyl group having from 2 to 9 carbon atoms,
- Rb is an alkyl group having 1 to 12 carbon atoms which is unsubstituted, monosubstituted by CN or CF3 or at least monosubstituted by halogen, and wherein one or more CH2 groups are each, independently of one another, optionally replaced by —O—, —S—, —CH═CH—, —C≡C—, —CO—, —CO—O—, —O—CO— or —O—CO—O— in such a way that O atoms are not linked directly to one another,
- L is, in each occurrence independently, F, Cl, CN or an optionally mono- or polyhalogenated alkyl, alkoxy, alkenyl or alkenyloxy group having up to 3 carbon atoms, and
- r is 0, 1, 2, 3 or 4.
3 more elements
A liquid-crystalline compound of formula I
- 90
- wherein
- Ra is an alkenyl group having from 2 to 9 carbon atoms,
- Rb is an alkyl group having 1 to 12 carbon atoms which is unsubstituted, monosubstituted by CN or CF3 or at least monosubstituted by halogen, and wherein one or more CH2 groups are each, independently of one another, optionally replaced by —O—, —S—, , —CH═CH—, —C≡C—, —CO—, —CO—O—, —O—CO— or —O—CO—O— in such a way that O atoms are not linked directly to one another,
- L is, in each occurrence independently, F, Cl, CN or a mono- or polyhalogenated alkyl, alkoxy, alkenyl or alkenyloxy group having up to 3 carbon atoms, and
- r is 0, 1, 2, 3 or 4,
- wherein the phenyl ring is substituted by L in 2- and 3-position or in 3- and 5-position or in 2- and 6-position, and/or Rb is alkenyl with 2 to 9 carbon atoms.
4 more elements
A liquid-crystalline compound of formula I
- 91
- wherein
- Ra is an alkenyl group having from 2 to 9 carbon atoms,
- Rb is an alkyl group having 1 to 12 carbon atoms which is unsubstituted, monosubstituted by CN or CF3 or at least monosubstituted by halogen, and wherein one or more CH2 groups are each, independently of one another, optionally replaced by —O—, —S—, , —CH═CH—, —C≡C—, —CO—, —CO—O—, —O—CO— or —O—CO—O— in such a way that O atoms are not linked directly to one another,
- L is F, Cl, CN, CF3, OCF3 or OCH3, and
- r is 0, 1, 2, 3 or 4,
3 more elements
Dependencies are inferred from the claim text.