| 摘要 |
The invention relates to chiral compounds of formula I wherein R1, R2, MG1, MG21, Sp, X, Y, a, b, c and d have the meaning given in claim 1, to a liquid crystalline mixture comprising at least one chiral compound of formula I, to a polymerizable liquid crystalline mixture comprising at least one chiral compound of formula I and optionally at least one polymerizable mesogenic compound, to the use of such a liquid crystalline mixture or a polymerizable liquid crystalline mixture for the preparation of anisotropic polymer films with a chiral liquid crystalline phase, for active and passive optical elements like polarizers, compensators or color filters and for liquid crystal displays, for example STN, TN, AMD-TN, temperature compensation, guest-host or phase change displays, or surface stabilized or polymer stabilized cholesteric texture (SSCT, PSCT) displays, to cholesteric liquid crystal displays comprising liquid crystalline mixtures comprising chiral compounds of formula I and to polymer films with a chiral liquid crystalline phase obtainable by (co)polymerizing a liquid crystalline mixture comprising at least one chiral compound of formula I and at least one polymerizable compound.
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