摘要:
A compound represented by the following general formula (1) is provided. This has broader temperature range of nematic phase, lower viscosity and higher miscibility with other liquid crystal compounds at low temperature than those of conventional liquid crystal compounds, and the compounds have high chemical stability. wherein H 1 to H 8 represent independently a hydrogen atom or a halogen atom, provided that at least one of them is a halogen atom; R 1 represents a moiety which is an alkyl group having 2 to 20 carbon atoms provided that one or more methylene groups (-CH 2 -) which are not successive in the alkyl group are replaced with an oxygen atom (-O-) in the form of ether; Y 1 represents an alkyl group having 1 to 20 carbon atoms, and one or more methylene groups in Y 1 independently may be replaced with an oxygen atom, a sulfur atom, a dihydroxysilyl group, a dimethylsililene group, -CH=CH-or -C≡C-; X 1 to X 3 represent independently a covalent bond, a 1,2-ethylene group or a 1,4-butylene group.
摘要翻译:提供由以下通式(1)表示的化合物。 与常规液晶化合物相比,它具有较宽的向列相温度范围,较低的粘度和较低的与其他液晶化合物的混溶性,且化合物具有较高的化学稳定性。 其中H1至H8独立地表示氢原子或卤素原子,条件是其中至少一个是卤素原子; R 1表示碳原子数为2〜20的烷基的部分,只要烷基中不连续的1个以上的亚甲基(-CH 2 - )被氧原子(-O-)置换为 醚; Y 1表示碳原子数1〜20的烷基,Y 1中的1个以上的亚甲基可以独立地被氧原子,硫原子,二羟基甲硅烷基,二甲基硅烷基,-CH = CH-或-C≡ C-; X1至X3独立地代表共价键,1,2-亚乙基或1,4-亚丁基。
摘要:
Liquid crystal composition having a high voltage-holding ratio of liquid crystal element and being almost unchanged in the helical pitch even when subjected to purification treatment with adsorbents or the like, which composition is a liquid crystal mixture of an achiral liquid crystal compound of the following formula (IV) with a chiral compound having an adsorptivity to adsorbents, not greater than that of the achiral compound:
wherein A', B', C' and D' each independently are trans-1,4-cyclohexylene, 1-cyclohexene-1,4-diyl or 1,4-phenylene; g, h and i each are 0 or 1; (g+h+i)≧1 ; X', Y' and Z' each independently are a single bond, -CH₂-CH₂-, -CH=CH- or -C≡C-; R⁷ is C n H 2n+1 -, C n H 2n-1 or C n H 2n+1 OC k H 2k -; R⁸ is C m H 2m+1 -, C m H 2m+1 O-, F, CHF₂O or CF₃O-; n and m each independently are an integer of 1 to 18; k is an integer of 1 to 17; (n+k) is 2 to 18; at least one of X', Y' and Z' is single bond; when ring D' is 1,4-phenylene and R⁸ is F, CHF₂O- or CF₃O-, then H at ortho position as regards R⁸ may be replaced by F; and "Then" g is 1 and ring B' or C' is 1,4-phenylene, when H at the lateral position of the ring may be replaced by F. It is preferred in order to exhibit a high voltage-holding ratio that the achiral liquid crystal compound have as a polar group, a functional group (such as F and CF 3 O-) limited to a halogen atom such as F, Cℓ, etc. or an ether bond, besides the C-C bond and the C-H bond. As to chiral compounds those having a functional group restricted to only a halogen atom or an ether bond are preferred, in the same aspect, chiral agent compounds having a polar group of -CN group as a fuctional group are unsuitable.
摘要翻译:液晶组合物具有高电压保持率的液晶元件,并且即使在用吸附剂等进行纯化处理时几乎没有变化,该组成是以下的非手性液晶化合物的液晶混合物 式(Ⅳ)与对吸附剂具有吸附性的手性化合物不大于非手性化合物:其中A',B',C'和D'各自独立地为反式-1,4-亚环己基,1 环己烯-1,4-二基或1,4-亚苯基; g,h和i各自为0或1; (G + H + I)> / = 1; X',Y'和Z'各自独立地是单键,-CH 2 -CH 2 - , - CH = CH-或-C≡CENTICALC-; R 7是C n H 2n + 1,C n H 2n-1或C n H 2n + 1 OC k H 2k-; R 8是C m H 2n + 1,C m H 2m + 10,F,CHF 2 O或CF 3 O-; n和m各自独立地为1〜18的整数; k为1〜17的整数。 (n + k)为2〜18; X',Y'和Z'中的至少一个是单键; 当环D'为1,4-亚苯基且R 8为F,CHF 2 O-或CF 3 O-时,则R 8在邻位的H可被F取代; “然后”g为1,环B'或C'为1,4-亚苯基,当环的横向位置的H可以被F代替时,为了表现出高的电压保持率,优选为 除CC键和CH键之外,非手性液晶化合物具有极性基团,限于诸如F,C 1等卤素原子或醚键的官能团(如F和CF 3 O-)。 对于具有仅限于卤素原子或醚键的官能团的手性化合物是优选的,在同一方面,具有-CN基极性基团的手性试剂化合物作为官能团是不合适的。
摘要:
A chiral nematic liquid crystal composition is provided, which has a broad d/P margin, particularly for corresponding to a large size of LCD panel, while satisfying various characteristics sought for STN display mode, and which contains as a first component, at least one member of compounds expressed by the formulas (I-a) to (I-d), as a second component, at least one member of compounds expressed by the formulas (II) to (V), and as a third component, a chiral component expressed by the formula (X),
R 5 -(B)-Z 2 -(C)-R 6 (II) R 7 -(D)-Z 3 -(E)-Z 4 -(G)-R 8 (III) In these formulas, R 1 to R 5 represent an alkyl group of 1 to 10 carbon atoms, etc.; Z 0 to Z 4 represent -CH 2 CH 2 -, etc.; B,C,E and G represent 1,4-cyclohexylene or 1,4-phenylene; D represents 1,4-cyclohexylene or 1,3-pyrimidine-2,5-diyl; Q 1 and Q 2 represent H or F; and q and m each independently represent 0 or 1; R 1 to R 12 represent an alkyl group of 1 to 10 carbon atoms or an alkenyl group of 2 to 10 carbon atoms. This composition may be used in STN mode, TN mode or AN mode liquid crystal display elements. This invention also describes the liquid crystal display elements containing such composition.
摘要:
Nouveaux composés indiqués pour être utilisés comme dopants chiraux dans des cristaux liquides smectiques ferroélectriques, comprenant un dérivé optiquement actif d'un acide alpha-aminé de formule (I), où A représente un résidu d'un acide alpha-aminé naturel dans lequel les atomes d'hydrogène dans les groupes fonctionnels ont été remplacés par un groupe de blocage, par exemple alkyle, et au moins un élément parmi X et Y représentent des chaînes mésogéniques reliées de groupes cycliques. Dans une deuxième série de composés on crée une liaison entre un groupe mésogénique et un groupe fonctionnel dans le résidu A, et on bloque l'un ou l'autre des groupes acide alpha-aminé acide carboxylique. Sont également décrits un mélange de cristaux liquides et un dispositif utilisant ces composés.
摘要:
Ferroelectric smectic liquid crystal mixtures are provided consisting of two constituents; a smectic host and another containing a chiral compound in which rotation of the chiral centre relative to the molecular core is sterically hindered, so that the chiral compound induces a high Ps in the mixture. A preferred class of chiral compounds is those derived from naturally occurring compounds with chiral groups, especially alpha-hydroxycarboxylic acids, amino acids and terpenoids, e.g. with chiral groups (I), (II), (III). The chiral group is incorporated into a compound containing a mesogenic combination of groups, e.g. with chains of cyclic groups and some mesogenic combinations are described.
摘要:
Compounds which may be used as a dopant or host in a ferroelectric chiral smectic liquid crystal mixture. The compounds are characterised in that they are derivatives of an X-hydroxy carboxylic acid and contain the chiral unit (I), in which Ro may be alkyl, alkoxy, halogen, formula (II), where b may be 0 to 3 and the phenyl ring may be substituted, and a is 0 or 1. The chiral unit is combined with a range of mesogenic combinations of groups. Lactic acid derivatives are described in detail (i.e. Ro = methyl) together with various preparative routes, for example the compound formula (III), which has dopant properties in a range of hosts.
摘要:
Ferroelectric smectic liquid crystal mixtures are provided consisting of two constituents; a smectic host and another containing a chiral compound in which rotation of the chiral centre relative to the molecular core is sterically hindered, so that the chiral compound induces a high Ps in the mixture. A preferred class of chiral compounds is those derived from naturally occurring compounds with chiral groups, especially alpha-hydroxycarboxylic acids, amino acids and terpenoids, e.g. with chiral groups (I), (II), (III). The chiral group is incorporated into a compound containing a mesogenic combination of groups, e.g. with chains of cyclic groups and some mesogenic combinations are described.
摘要:
A storage type liquid crystal composition in which a nematic-cholesteric mesophase transition is utilized and the anisotropy of the dielectric constant is positive, and an X-Y dot-matrix-type storage-type liquid-crystal-display element comprising the composition. The present liquid crystal composition has a low driving voltage and a long memory effect. This composition comprises a cyclohexane-type liquid crystal, an azoxy-type liquid crystal, and a compensated cholesteric liquid crystal and/or cholesteryl oleate.
摘要:
A polymerizable liquid-crystal compound represented by the general formula (I) can be used as an additive effective for preventing crystal deposition after coating with the polymerizable liquid crystal (II) or a polymerizable liquid crystal similar thereto. P represents a polymerizable functional group; Sp represents a spacer or a single bond; Z 1 and Z 2 each represent -CO-O-; R 0 represents a linear alkyl group having from 1 to 15 carbon atoms; R 2 , R 3 and R 4 each independently represent an alkyl group having from 1 to 4 carbon atoms, an alkoxy group having from 1 to 4 carbon atoms, an alkoxycarbonyl group having from 2 to 5 carbon atoms, an acyloxy group having from 2 to 5 carbon atoms, an acyl group having from 2 to 4 carbon atoms, an amide group having from 2 to 5 carbon atoms, a cyano group, an amino group, a hydroxyl group, or a halogen atom; r 1 , r 2 and r 3 indicate an integer of from 0 to 4; when r 1 , r 2 and r 3 each are 2 or more, then R 2 , R 3 and R 4 each may be the same or different; however, when R 0 is a methyl group, then r 2 is not 1.
摘要翻译:由通式(I)表示的可聚合液晶化合物可以用作在用可聚合液晶(II)或类似于其的可聚合液晶涂覆之后防止结晶沉积的添加剂。 P表示可聚合官能团; Sp表示间隔基或单键; Z 1和Z 2各自表示-CO-O-; R 0表示具有1至15个碳原子的直链烷基; R 2,R 3和R 4各自独立地表示具有1至4个碳原子的烷基,具有1至4个碳原子的烷氧基,具有2至5个碳原子的烷氧基羰基,具有2个 5个碳原子,具有2至4个碳原子的酰基,具有2至5个碳原子的酰胺基,氰基,氨基,羟基或卤素原子; r 1,r 2和r 3表示0〜4的整数, 当r 1,r 2和r 3各自为2或更大时,则R 2,R 3和R 4各自可以相同或不同; 然而,当R 0为甲基时,则r 2不为1。