Liquid-crystalline medium
AssigneeMerck Patent GmbH
InventorsMichael WITTEK, Dagmar KLASS
Life of this patent
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Abstract
The invention relates to a liquid-crystalline medium which comprises one or more compounds of the formula BO in which the parameters have the meanings indicated in Claim 1, to the use of the liquid-crystalline medium for electro-optical purposes, in particular in liquid-crystal light valves for lighting devices for motor vehicles, and to liquid-crystal light valves which comprise this medium and lighting devices for motor vehicles which contain such liquid-crystal light valves and to compounds of the formula BO.
Claims17
Liquid-crystalline medium, characterised in that it comprises one or more compounds of the formula BO
- in which the individual radicals have the following meanings:
- R01 denotes an alkyl or alkoxy radical having 1 to 15 C atoms, where one or more H atoms in these radicals may be replaced by F, Cl or CN and, in addition, one or more CH2 groups may each be replaced, independently of one another, by
- —C≡C—, —O—, —CO—O— or —O—CO— in such a way that O atoms are not linked directly to one another,
- R02 denotes an alkyl or alkoxy radical having 1 to 15 C atoms, where one or more H atoms in these radicals may be replaced by Cl or CN and one or more CH2 groups may each be replaced, independently of one another, by
- —C≡C—, —CH═CH—, —O—, —CO—O— or —O—CO— in such a way that 0 atoms are not linked directly to one another,
- A1, A2, independently of one another, denote 1,4-cyclohexanediyl, in which one or two CH2 groups may be replaced by O in such a way that O atoms are not linked to one another,
- Z1 denotes —CH2CH2—, —CF2CF2—, —C(O)O—, —OC(O)—, trans-CH═CH—, trans-CF═CF—, —CH2O—, —OCH2— or a single bond,
- Y denotes F, Cl, CF3 or alkyl or alkoxy having 1 to 6 C atoms, in which one or more H atoms may be replaced by F,
- r denotes 0 or 1,
- and
- s denotes 0, 1, 2, 3 or 4.
A compound of the formula BO
- in which the individual radicals have the following meanings:
- R01 denotes an alkyl or alkoxy radical having 1 to 15 C atoms, where one or more H atoms in these radicals may be replaced by F, Cl or CN and, in addition, one or more CH2 groups may each be replaced, independently of one another, by
- —C≡C—, —O—, —CO—O— or —O—CO— in such a way that O atoms are not linked directly to one another,
- R02 denotes an alkyl or alkoxy radical having 1 to 15 C atoms, where one or more H atoms in these radicals may be replaced by Cl or CN and one or more CH2 groups may each be replaced, independently of one another, by
- —C≡C—, —CH═CH—, —O—, —CO—O— or —O—CO— in such a way that O atoms are not linked directly to one another,
- A1, A2, independently of one another, denote, 1,4-cyclohexanediyl, in which one or two CH2 groups may be replaced by O in such a way that O atoms are not linked to one another,
- Z1 denotes —CH2CH1—, —CF2CF2—, —C(O)O—, —OC(O)—, trans-CH═CH—, trans-CF═CF—, —CH2O—, —OCH2— or a single bond,
- Y denotes F, Cl, CF3 or alkyl or alkoxy having 1 to 6 C atoms, in which one or more H atoms may be replaced by F,
- r denotes 0 or 1,
- and
- s denotes 0, 1, 2, 3 or 4.
Dependencies are inferred from the claim text.