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US 5,328,642 AGranted
Liquid-crystalline medium
AssigneeMerck Patent GmbH
InventorsBernhard Rieger, Volker Reiffenrath, Reinhard Hittich
Life of this patent
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Abstract
The invention relates to a liquid-crystalline medium based on a mixture of polar compounds of positive dielectric anisotropy, characterized in that it contains one or more compounds of the general formula I ##STR1## in which Q is alkylene having up to 5 carbon atoms or a single bond, X is H or F, and R is alkyl, oxaalkyl, fluoroalkyl or alkenyl, in each case having up to 7 carbon atoms.
Claims8
A liquid crystalline medium based on a mixture of polar compounds having positive dielectric anisotropy, comprising:
- one or more compounds of the formula I ##STR72## in which Q is alkylene having 1 to 5 carbon atoms or a single bond, X is H or F, and R is alkyl, oxaalkyl, fluoroalkyl or alkenyl, in each case having 1 to 7 carbon atoms,
- one or more compounds selected from the formulae II to VIII ##STR73## in which R is independently as defined above, X' is F, Cl, CF.sub.3, OCF.sub.3 or OCHF.sub.2,
- Y.sup.1 is H or F,
- Y.sup.2 is H or F, and
- r is 0 or 1, and
- one or more compounds of the formulae IX to XII:
- ##STR74## in which R, X', Y.sup.1 and Y.sup.2 are each, independently of one another, as defined above.
4 more elements
Dependencies are inferred from the claim text.