| US 7,582,337 B2 | ||
| Liquid-crystalline medium | ||
| Melanie Klasen-Memmer, Heuchelheim (Germany); Matthias Bremer, Darmstadt (Germany); and Izumi Saito, Darmstadt (Germany) | ||
| Assigned to Merck Patent Gesellschaft mit beschrankter Haftung, Darmstadt (Germany) | ||
| Filed on Feb. 19, 2008, as Appl. No. 12/33,055. | ||
| Claims priority of application No. 10 2007 008 462 (DE), filed on Feb. 19, 2007. | ||
| Prior Publication US 2008/0197319 A1, Aug. 21, 2008 | ||
| Int. Cl. C09K 19/32 (2006.01); C09K 19/30 (2006.01) | ||
| U.S. Cl. 428—1.1 [252/299.62; 252/299.63] | 14 Claims |
1. A liquid-crystalline medium based on a mixture of polar compounds, comprising at least one compound of formula I
 in which
R11 and R12 each, independently of one another, denote an alkyl or alkenyl radical having up to 15 C atoms which is unsubstituted, monosubstituted
by CN or CF3 or at least monosubstituted by halogen, in which optionally one or more CH2 groups are replaced by —O—, —S—,
 —C≡C—, —CF2O—, —OC—O— or —O—CO— in such a way that O atoms are not linked directly to one another,
 each, independently of one another, denote
 a and b each, independently of one another, denote 0 or 1, where a+b≧1.
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