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    • 5. 发明授权
    • Compounds and process for controlling cone tilt angle in mixtures of
smectic liquid crystal compounds
    • 用于控制近晶液晶化合物混合物中的锥角倾斜角的化合物和方法
    • US5855812A
    • 1999-01-05
    • US827753
    • 1997-04-11
    • Marc D. RadcliffePatricia M. SavuDaniel C. SnustadTerence D. Spawn
    • Marc D. RadcliffePatricia M. SavuDaniel C. SnustadTerence D. Spawn
    • G02F1/13C07D239/26C07D239/34C09K19/04C09K19/06C09K19/34C09K19/42C09K19/52C07C22/00
    • C07D239/26C09K19/04C09K19/3469
    • A process for controlling the cone tilt angle of a tilted smectic liquid crystal composition comprises the step of combining (a) at least one liquid crystal composition comprising at least one smectic or latent smectic liquid crystal compound comprising (i) an aliphatic fluorocarbon terminal portion comprising a terminal fluoroalkyl or fluoroether group and an alkylene group having at least two carbon atoms and containing at least one catenary ether oxygen atom, (ii) an aliphatic hydrocarbon terminal portion, and (iii) a central core connecting the terminal portions, wherein the alkylene group of the aliphatic fluorocarbon terminal portion is directly linked to the central core by a moiety selected from the group consisting of a covalent bond, --CH.dbd.CH--, and --C.tbd.C--; and (b) at least one liquid crystal composition comprising at least one smectic or latent smectic liquid crystal compound; with the provisos that at least one of the compositions (a) and (b) comprises at least one chiral liquid crystal compound and that the combining of compositions (a) and (b) provides an optically active, tilted chiral smectic liquid crystal composition. The process enables control of cone tilt angle and thereby control of the brightness characteristics of liquid crystal display devices.
    • 用于控制倾斜的近晶液晶组合物的锥体倾斜角的方法包括将(a)至少一种液晶组合物组合的步骤,所述液晶组合物包含至少一种近晶或潜暗的近晶液晶化合物,所述液晶组合物包含(i)脂族碳氟化合物末端部分, 末端氟代烷基或氟代醚基和具有至少两个碳原子并且含有至少一个链状醚氧原子的亚烷基,(ii)脂族烃末端部分和(iii)连接末端部分的中心核心,其中亚烷基 脂肪族碳氟化合物末端部分的基团通过选自共价键,-CH = CH-和-C 3 C-C的部分直接连接到中心核心; 和(b)至少一种液晶组合物,其包含至少一种近晶或潜层间的近晶液晶化合物; 条件是组合物(a)和(b)中的至少一种包含至少一种手性液晶化合物,并且组合物(a)和(b)的组合提供光学活性的倾斜手性近晶液晶组合物。 该过程能够控制锥形倾斜角度,从而控制液晶显示装置的亮度特性。