Patent ID: 9701903
Date: 2017-07-11
CPC Classifications: C09K

Claim:
1. A liquid-crystalline medium based on a mixture of polar compounds having negative dielectric anisotropy (Δ∈), which has a value for the ratio γ 1 /Δn 2 in the range 6-45 Pa·s with a clearing point of >60° C. and a Δ∈ of ≦−2.3, and comprises at least one compound of formula B-4 and at least one compound of formula IB and at least one compound of formula II and optionally at least one compound of formula IA in which alkyl each, independently of one another, denote a straight-chain alkyl radical having 1-6 C atoms; R —C≡C—, —CF v denotes 1 to 6, and at least one of the following compounds from groups A, B, or C: A) one or more compounds of the following formulae T-1 to T-22 in which R denotes H, an alkyl or alkenyl radical having up to 15 C atoms which is unsubstituted, monosubstituted by CN or CF —C≡C—, —OCF B) one or more compounds of the following formulae To-1 and To-2 in which R denotes H, an alkyl or alkenyl radical having up to 15 C atoms which is unsubstituted, monosubstituted by CN or CF —C≡C—, —OCF alkyl denotes a straight-chain alkyl radical having 1-6 C atoms; C) the following compound wherein alkyl* denotes a straight-chain alkyl radical having 1-6 C atoms.