Patent ID: 9701905
Date: 2017-07-11
CPC Classifications: C09K

Claim:
1. A liquid-crystalline medium comprising at least one dichroic dye F having a rylene structure whose longest-wave absorption maximum is at a wavelength of greater than 600 nm, and which is selected from the group consisting of compounds of formulae (F-I), (F-II), (F-III), (F-IV) and (F-V), wherein n is 1, 2, 3, 4, 5, 6, 7 or 8, Z F1 is, each independently, a single bond, —C(═O)O—, —OC(═O)—, —C(═O)S—, —SC(═O)—, —CF 2 —, —CF 2 —CF 2 —, —CF 2 O—, —OCF 2 — or —O—, R F1 is, each independently, an alkyl or alkoxy group having 1 to 10 C atoms, or an alkenyl or alkynyl group having 2 to 10 C atoms, or a cycloalkyl group having 3 to 10 C atoms, which are optionally substituted by one or more radicals R FA , or an aryl or heteroaryl group having 6 to 30 aromatic ring atoms, which are optionally substituted by one or more radicals R FA , R F2 , R F3 , R F4 , R F5 , R F6 are each independently, H, F, Cl, Br, OR FA , OCH 2 R FA , SR FA , SCH 2 R FA , C(═O)OR FA , an alkyl or alkoxy group having 1 to 10 C atoms, or an alkenyl or alkynyl group having 2 to 10 C atoms, or a cycloalkyl group having 3 to 10 C atoms, which are optionally substituted by one or more radicals R FA , or an aryl or heteroaryl group having 6 to 30 aromatic ring atoms, which are optionally substituted by one or more radicals R FA , or an aralkyl or heteroaralkyl group having 6 to 30 aromatic ring atoms, which are optionally substituted by one or more radicals R FA , or an aryloxy or heteroaryloxy group having 6 to 30 aromatic ring atoms, which are optionally substituted by one or more radicals R FA , R FA is, each independently, F, Cl, Br, —OCF 2 R FB , —CF 2 O—R FB , an alkyl or alkoxy group having 1 to 10 C atoms, or an alkenyl or alkynyl group having 2 to 10 C atoms, or a cycloalkyl group having 3 to 10 C atoms, where the said groups are optionally substituted by one or more radicals R FB , or an aryl or heteroaryl group having 6 to 30 aromatic ring atoms, which are optionally substituted by one or more radicals R FB , and R FB is, each independently, F or an aliphatic, aromatic or heteroaromatic organic radical having 1 to 20 C atoms; and one or more compounds of formula (I) wherein R 11 is H, F, Cl, CN, NCS, R 1 —O—CO—, R 1 —CO—O—, an alkyl, alkoxy or thioalkoxy group having 1 to 10 C atoms, or an alkenyl, alkenyloxy or thioalkenyloxy group having 2 to 10 C atoms, in which one or more H atoms in the above-mentioned groups are optionally replaced by F, Cl or CN, and in which one or more CH 2 groups in the above-mentioned groups are optionally replaced by O, S, —O—CO— or —CO—O—, R 1 is an alkyl group having 1 to 10 C atoms, in which one or more hydrogen atoms are optionally replaced by F or Cl, and in which one or more CH 2 groups are optionally replaced by O or S, Z 11 is —CO—O—, —O—CO—, —CF 2 —CF 2 —, —CF 2 —O—, —O—CF 2 —, —CH 2 —CH 2 —, —CH═CH—, —CF═CF—, —CF═CH—, —CH═CF—, —C≡C—, —OCH 2 —, —CH 2 O—or a single bond, A 11 is and X is, each independently, F, Cl, CN or an alkyl, alkoxy or alkylthio group having 1 to 10 C atoms, in which one or more hydrogen atoms in the above-mentioned groups are optionally replaced by F or Cl, and in which one or more CH 2 groups in the above-mentioned groups are optionally replaced by O or S.