| 摘要 |
<p>Anisotropic compounds having the formula (I) with two, three or four cyclic rests, of which at least one of them is a cycloaliphatic rest, appropriate as ingredients for the cross-polarization of liquid crystal mixtures for electro-optical displays when the compounds contain at least one ketocarbonyl group which is part of a bridge element linking the cycles or of a wing group. Similar compounds are partly known as such; but the capacity of the ketocarbonyl group as a cross-polarization group has been recognized recently and is surprising. The known ketones and the new numerous ketones of which the formula (11) is given in claim (11) provide a new way to optionally obtain either a negative DKA (dielectric constant anisotropy) or a positive DKA simultaneously with Δε/ε$(1,4)$values.</p> |
