Patent ID: 7914859
Filing Date: 2011-03-29
Classification: C09K

Abstract:
1. Mesogenic medium comprising one or more mesogenic compounds, said one or more mesogenic compounds comprising two or more mesogenic groups at least one of which is bound via a single bond to an aromatic ring, two or three of said two or more mesogenic groups being bound to the ortho positions of an aromatic ring, wherein one or more of the compounds comprising two or more mesogenic groups bound via a single bond to the ortho positions of an aromatic ring is chiral, wherein in said aromatic ring one or two non-adjacent ═CH— groups may be replaced by N and wherein said aromatic ring optionally may further be substituted, said mesogenic medium comprising one or more compounds of formula I wherein R R  are independently of each other, and, in case one or more of them are occurring more than once, also these are in each occurrence, independently of each other, an aromatic and/or alicyclic ring, or a group comprising two or more fused aromatic or alicyclic rings, wherein these rings optionally contain one or more hetero atoms selected from N, O and/or S, and are optionally monosubstituted or polysubstituted by R, R has the meaning given for R Z Y R m is 0, 1, 2, 3 or 4, n and o are, independently of each other, 1, 2, 3 or 4, and is 0, 1, 2, 3 or 4, and optionally the central phenyl ring may be substituted once or more times by halogen and/or R, and/or one or two non-adjacent ═CH— groups may be replaced by N.