Antiferroelectric liquid crystal composition
    141.
    发明授权
    Antiferroelectric liquid crystal composition 失效
    反铁电液晶组合物

    公开(公告)号:US5316694A

    公开(公告)日:1994-05-31

    申请号:US36882

    申请日:1993-03-25

    摘要: An antiferroelectric liquid crystal composition comprising a first component comprising at least one compound expressed by the formula (I) and exhibiting no antiferroelectric phase, and a second component comprising at least one compound expressed by the formula (II) and exhibiting an antiferroelectric phase, the contents of the first component and the second component being respectively 1 to 40% and 60 to 99%, based upon the total weight of the two components: ##STR1## wherein in the formula (I), R.sup.1 is 1-18C linear alkyl or alkoxy; R.sup.2 is 1-18C alkyl or alkoxy; k, l, m and n are 0 or 1; (k+l) and (m+n) are 1 or 2, (k+l)+(m+n) are 2 or 3; X is --OCH.sub.2 --, --CH.sub.2 O--, --COO--, --OCO-- or single bond; 6-membered rings A, B, C and D are 1,4-phenylene, pyridine-2,5-diyl, pyrimidine-2,5-diyl, pyrazine-2,5-diyl or pyridazine-3,6-diyl, one of the side-positioned hydrogen atoms of which may be replaced by halogen atom or CN, andin the formula (II), R.sup.3 is 1-18C linear alkyl or alkoxy; R.sup.4 is 2-18C alkyl or alkoxy; p, q, t and u are 0 or 1; (p+q) and (t+u) each are 1 or 2; (p+q)+(t+u) are 2 or 3; j is 0 or 1; Z is --COO--, --OCO--, --OCH.sub.2 --, --CH.sub.2 O--or single bond; Y is --CH.sub.3 ; 6-membered rings E, F, G and H are 1,4-phenylene, pyridine-2,5-diyl, pyrimidine-2,5-diyl, pyrazine-2,5-diyl or pyridazine-3,6-diyl; * shows asymmetric carbon atom.An antiferroelectric liquid crystal composition having the threshold voltage lowered at the time of transition from the antiferroelectric phase to ferroelectric phase accompanying the electric field impression in the antiferroelectric phase is provided, and a light-switching element which has a good contrast and can effect a tristable switching is obtained using the above composition.

    摘要翻译: 一种反铁电液晶组合物,其包含包含至少一种由式(I)表示的化合物并且不显示反铁电相的第一组分和包含至少一种由式(II)表示的化合物并显示出反铁电相的第二组分, 基于两种组分的总重量,第一组分和第二组分的含量分别为1至40%和60至99%:其中在式(I)中, R1是1-18C直链烷基或烷氧基; R2为1-18C烷基或烷氧基; k,l,m和n分别为0或1; (k + 1)和(m + n)为1或2,(k + 1)+(m + n)为2或3; X是-OCH 2 - , - CH 2 O - , - COO - , - OCO-或单键; 6元环A,B,C和D是1,4-亚苯基,吡啶-2,5-二基,嘧啶-2,5-二基,吡嗪-2,5-二基或哒嗪-3,6-二基, 其中一个侧面定位的氢原子可以被卤素原子或CN代替,而在式(II)中,R 3是1-18个直链烷基或烷氧基; R4是2-18C烷基或烷氧基; p,q,t和u分别为0或1; (p + q)和(t + u)分别为1或2; (p + q)+(t + u)为2或3; j为0或1; Z是-COO - , - OCO - , - OCH 2 - , - CH 2 O-或单键; Y为-CH 3; 6元环E,F,G和H是1,4-亚苯基,吡啶-2,5-二基,嘧啶-2,5-二基,吡嗪-2,5-二基或哒嗪-3,6-二基; *表示不对称碳原子。 提供了一种反铁电液晶组合物,该反铁电液晶组合物在反铁电相中随着电场印模而从反铁电相转变为铁电相时具有降低的阈值电压,并且具有良好的对比度并且可以实现三重态的光开关元件 使用上述组成获得切换。

    2,5-diphenylpyrimidine compound
    143.
    发明授权
    2,5-diphenylpyrimidine compound 失效
    2,5-二苯基嘧啶化合物

    公开(公告)号:US5100578A

    公开(公告)日:1992-03-31

    申请号:US426227

    申请日:1989-10-25

    摘要: An optically active compound having a large spontaneous polarization ps value (ps) particularly for realizing a high speed response, and a liquid crystal composition are provided, which compound is an optically active 2,5-diphenylpyrimidine compound expressed by the formula ##STR1## wherein R.sup.1 is 1-20C alkyl or alkoxy, R.sup.2 is 1-20C alkyl, A is ##STR2## and * indicates an asymmetric carbon atom.

    摘要翻译: 提供特别用于实现高速响应的具有大的自发极化ps值(ps)的光学活性化合物和液晶组合物,该化合物是由式(IMAGE)表示的光学活性的2,5-二苯基嘧啶化合物 I)其中R1为1-20C烷基或烷氧基,R2为1-20C烷基,A为“IMA”,*为不对称碳原子。