Ferroelectric smectic liquid crystalline medium
AssigneeMerck Patent GmbH
InventorsMatthias BREMER, Atsutaka MANABE
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Abstract
The new LC media exhibit a new spontaneous, self-supporting ferroelectric smectic phase. They typically comprise one or more dielectrical neutral, aromatic compounds described further in the description in a highly polar host mixture typical for ferro-electric nematic mixtures. The mixtures are useful for electro-optics, electronics, electro-mechanic and other applications for materials with very high dielectric permittivity. In addition, the present invention relates to liquid crystal devices, electric and electronic elements which contain the liquid crystalline media according to the invention.
Claims14
A liquid crystalline medium exhibiting a ferroelectric smectic phase, wherein the medium comprises
- 5% by weight or more of a first component having a low polarity of −5<Δε<5 and
- 60% by weight or more of a second polar component of Δε of 20 or more at 20° C. and 1 KHz.
A ferroelectric smectic liquid crystalline medium comprising one or more compounds of formula IA,
- wherein
- A1A denotes
- A2A denotes
- A3A denotes
- L3A are each independently H, alkyl, alkoxy or alkoxyalkyl, each with 1 to 7 C atoms,
- Z1A and Z2A independently of one another are a single bond, —C≡C— or —CH═CH—,
- R1A independently is an alkyl radical having 1 to 12 C atoms, where, in addition, one or more CH2 groups in these radicals may in each case be replaced, independently of one another, by —C≡C—, —CH═CH—,
- —O—, —S—, —(CO)—O— or —O—(CO)— in such a way that O/S atoms are not linked directly to one another, and in which, in addition, one or more H atoms may be replaced by halogen, or denotes H,
- R2A independently is an alkyl radical having 1 to 12 C atoms, where, in addition, one or more CH2 groups in these radicals may in each case be replaced, independently of one another, by —C≡C—, —CH═CH—,
- —O—, —S—, —(CO)—O— or —O—(CO)— in such a way that O/S atoms are not linked directly to one another, and in which, in addition, one or more H atoms may be replaced by halogen, or denotes H,
- and
- n1 is 0, 1 or 2.
A method of preparation of a liquid crystalline medium exhibiting a ferroelectric smectic phase, wherein
- 5% by weight or more of a first component having a low polarity of −5<Δε<5, 60% by weight or more of compounds comprised in a second ferroelectric component and any other components or additives are combined and mixed with each other, wherein the second polar component has a ferroelectric nematic phase.
Dependencies are inferred from the claim text.