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    • 45. 发明授权
    • Liquid crystal compositions
    • 液晶组成
    • US5609790A
    • 1997-03-11
    • US457741
    • 1995-06-01
    • Takashi TanakaYuzuru SatoHiroshi IwaneShiro Inui
    • Takashi TanakaYuzuru SatoHiroshi IwaneShiro Inui
    • C09K19/02C09K19/46C09K19/34C09K19/12C09K19/52
    • C09K19/0266C09K19/46
    • A liquid crystal composition which shows an antiferroelectric smectic phase in a wide temperature range including room temperatures, and allows high speed operation at a low voltage. A liquid crystal composition comprising at least one kind of compound expressed as ##STR1## shows an antiferroelectric smectic liquid crystalline phase at room temperatures. In the above-mentioned formula, both R.sub.1 and R.sub.2 are alkyl groups, X.sub.1 is a bonding group, X.sub.2 and X.sub.3 are independently selected bonding groups, k, m and n are independently selected from 0 or the integer 1, Z is CF.sub.3 or CH.sub.3, A.sub.1 and A.sub.2 are groups independently selected from a six-membered ring optionally replaced with 0 to 2 nitrogen atoms, or a group in which 2 to 3 such six-membered rings of the same kind or different kinds are linked at the para positions directly or via one or more bonding groups, wherein one or more hydrogen atoms in one or more such rings is optionally replaced with either fluorine atom, methyl group or ethyl group.
    • 一种液晶组合物,其在包括室温的宽温度范围内显示出反铁电近晶相,并允许在低电压下高速运行。 包含至少一种表示为“IMAGE”的化合物的液晶组合物在室温下显示出反铁电的近晶液晶相。 在上述式中,R 1和R 2均为烷基,X 1为键合基团,X 2和X 3独立地选自键合基团,k,m和n独立地选自0或整数1,Z为CF 3或CH 3 ,A1和A2是独立地选自任选被0至2个氮原子替代的六元环的基团,或者其中2至3个相同种类或不同类型的六元环直接在对位连接的基团 或经由一个或多个键合基团,其中一个或多个这样的环中的一个或多个氢原子任选被氟原子,甲基或乙基基团取代。