Liquid-crystalline medium
A technology of liquid crystal media and compounds, which is applied in the field of liquid crystal displays and can solve problems such as high rotational viscosity
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[0307] The following examples are intended to illustrate the invention without limiting it.
[0308] In this context, percentage data represent percentages by weight. All temperatures are expressed in degrees Celsius. m.p. means melting point, cl.p. = clearing point. Furthermore, C=crystalline state, N=nematic phase, S=smectic phase and I=isotropic phase. The data between these symbols represent the transition temperature. also,
[0309] V о Indicates threshold voltage, capacitive at 20°C [V]
[0310] Δn represents the optical anisotropy measured at 20 °C and 589 nm
[0311] Δε represents the dielectric anisotropy at 20 °C and 1 kHz
[0312] cp. means clearing point [°C]
[0313] K 1 Indicates the elastic constant, the "slope" deformation at 20°C, [pN]
[0314] K 3 Indicates the elastic constant, "bending" deformation at 20°C, [pN]
[0315] gamma 1 Indicates the rotational viscosity [mPa·s] measured at 20°C, measured in a magnetic field by the rotational method
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Embodiment 1
[0320] Mode The compound of is prepared according to the following scheme:
[0321]
[0322] C43S B 75N96.2I; Δn=0.0594; Δε=0.1; γ 1 =43mpa s;
[0323] K 1 =15.78; K 3 =19.56
[0324] The following compounds were similarly prepared
[0325]
[0326] Mixture Example
[0327] Unless explicitly stated otherwise, electro-optical data were determined in a TN cell at 20°C at the first minimum (ie d·Δn value of 0.5 μm). Optical data are determined at 20°C unless expressly stated otherwise. All physical properties were determined according to "Merck Liquid Crystals, Physical Properties of Liquid Crystals", Status Nov. 1997, Merck KGaA, Germany and applied at a temperature of 20°C, unless expressly stated otherwise.
Embodiment M1
[0329]
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