| 摘要 |
The invention relates to chiral compounds of formula I <CHEM> wherein R<1>, R<2>, X, Y<1> and Y<2> have the meaning given in claim 1, to a liquid crystalline mixture comprising at least one chiral compound of formula I, to a chiral linear or crosslinked liquid crystalline polymer obtainable by polymerizing a polymerizable mixture comprising at least one chiral compound of formula I, to the use of chiral compounds of formula I and mixtures and polymers obtained thereof in liquid crystal displays, such as STN, TN, AMD-TN, temperature compensation, guest-host, phase change or surface stabilized or polymer stabilized cholesteric texture (SSCT, PSCT) displays, in active and passive optical elements like polarizers, compensators, alignment layers, colour filters or holographic elements, in adhesives, synthetic resins with anisotropic mechanical properties, cosmetics, diagnostics, liquid crystal pigments, for decorative and security applications, in nonlinear optics, optical information storage or as chiral dopants, and to a liquid crystal display comprising a mixture comprising at least one chiral compound of formula I.
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