摘要:
The compound (1) having 2,3-bis(trifluoromethyl)-1,4-phenylene is stable chemically and has excellent miscibility with other liquid crystal compounds, large and negative dielectric anisotropy and proper optical anisotropy. A liquid crystal composition comprising the compound has large specific resistance and a large voltage holding ratio, and that the composition is useful for a liquid crystal display element. The compound (1) is represented by formula (1): RaA1—Z1)m—(A2—Z2n—A3—Z3—A4—Rb (1) wherein Ra and Rb independently are alkyl having 1 to 20 carbons, any —CH2— in the alkyl may be replaced by —O—, —S—, —CH═CH—, or —C≡C—, and any hydrogen may be replaced by halogen; A1, A2, A3, and A4 independently are 1,4-cyclohexylene, 1,4-cyclohexenylene, 1,3-dioxane-2,5-diyl, 1,4-phenylene, pyridine-2,5-diyl, pyrimidine-2,5-diyl, pyridazine-3,6-diyl, or 2,3-bis(trifluoromethyl)-1,4-phenylene, any hydrogen in these rings may be replaced by halogen, and at least one of A1, A2, A3, and A4 is 2,3-bis(trifluoromethyl)-1,4-phenylene; Z1, Z2 and Z3 independently are a single bond, —(CH2)2—, —(CF2)2—, —COO—, —OCO—, —CH2O—, —OCH2—, —CF2O—, —OCF2—, —CH═CH—, —CF═CF—, —C≡C—, —(CH2)4—, —(CH2)3O—, or —O(CH2)3—; m and n independently are 0 or 1.
摘要:
Silicon compounds having a low viscosity and a low threshold voltage and improved mutual solubility, a liquid crystal composition comprising the same and a liquid crystal display using the liquid crystal composition. The silicon compound is represented by formula (1): wherein Y1 is, for example, alkylene having 1 to 10 carbon atoms, Y2 is, for example, hydrogen, halogen, —CN, —C≡C—CN, or alkyl having 1 to 10 carbon atoms; A1, A2, A3, and A4 each are, for example, independently 1,4-cyclohexylene, 1,4-cyclohexenylene, 1,4-phenylene, or 1,4-phenylene; Z1, Z2 and Z3 each are independently a single bond, —(CH2)2—, —OCH2—, —CH2O—, —CH═CH—, —C≡C—, —(CH2)4—, —O(CH2)3—, —(CH2)3O—, —COO—, —OCO—, —OCF2—, or —CF2O—; and p and q each are independently 0 or 1.
摘要翻译:具有低粘度和低阈值电压和改善的互溶性的硅化合物,包含该硅化合物的液晶组合物和使用该液晶组合物的液晶显示器。 硅化合物由式(1)表示:其中Y 1为例如具有1至10个碳原子的亚烷基,Y 2为例如氢,卤素,-CN,-C = C- CN或具有1至10个碳原子的烷基; A 1,A 2,A 3和A 4各自独立地为1,4-亚环己基,1,4-亚环己烯基,1,4-亚苯基或1,4-亚环己基, 亚苯基; Z 1,Z 2和Z 3各自独立地为单键, - (CH 2)2 - , - OCH 2 - , - CH 2 O - , - CH = CH - , - C = CH2)4-,-O(CH2)3 - , - (CH2)3O-,-COO-,-OCO-,-OCF2-或-CF2O-; p和q各自独立地为0或1。
摘要:
Provided are a polymerizing liquid-crystalline compound of formula (1). In formula (1), Q1 to Q4 each independently represent a formula (2), a hydrogen atom, a halogen atom, an alkyl group or the like; at least two of Q1 to Q4 are a formula (2) and may differ from each other. In formula (2), A independently represent a 1,4-cyclohexylene group, a 1,4-phenylene group or the like; X independently represents a single bond, an alkylene group or the like; Z represents a single bond, —COO—, —OCO— or the like; n indicates an integer of from 0 to 3; p represents any one polymerizing group of formulae (P1) to (P8); W represents a hydrogen atom, a halogen atom, an alkyl group or the like. When Q1 and Q2 are both hydrogen atoms and when Q3 and Q4 are both formula (2), then p must not be (P8).
摘要:
A novel liquid crystalline compound having a low viscosity and a high elastic constant ratio and at the same time, a superior compatibility with other known liquid crystalline compounds, and a liquid crystal composition and a liquid crystal display element containing the novel compound, are provided. The compound is an alkenylcyclohexane derivative expressed by the formula (1): ##STR1## wherein R.sup.1 and R.sup.2 represent a linear or branched alkyl group of 1 to 15 carbon atoms or alkenyl group of 2 to 15 carbon atoms; at least one of R.sup.1 and R.sup.2 represents an alkenyl group; in these groups, one or more non-adjacent CH.sub.2 groups may be replaced by oxygen atom, sulfur atom or --C.tbd.C-- group; ring A.sup.1, ring A.sup.2 and ring A.sup.3 each independently represent 1,4-cyclohexylene group wherein one or more CH.sub.2 groups on the ring may be replaced by oxygen atom or sulfur atom, or 1,4-phenylene group wherein one or more CH groups on the ring may be replaced by nitrogen atom; Z.sup.1 and Z.sup.2 each independently represent --CH.sub.2 CH.sub.2 --, --CH.sub.2 O--, --OCH.sub.2 --, --CH.dbd.CH--, --C.tbd.C-- or single bond; Z.sup.3 represents --(CH.sub.2).sub.4 --, --CH.dbd.CH--(CH.sub.2).sub.2 --, --CH.sub.2 --CH.dbd.CH--CH.sub.2 -- or --(CH.sub.2).sub.2 --CH.dbd.CH--; and m, n and i each independently represent 0 or 1.
摘要:
The present invention provides a liquid-crystalline compound which has a reduced viscosity, a wide liquid crystal temperature range (high clearing point), a high chemical stability (extremely high specific resistance, high voltage holding ratio) and a high solubility with other liquid-crystalline compound(s) and preferably has a proper refractive index anisotropy. The present invention also provides a liquid crystal composition having excellent properties. The liquid-crystalline compound is represented by the following general formula (1): wherein R and R' each independently represents a C.sub.1-20 alkyl or halogenated alkyl group or a group obtained by replacing one or more --CH.sub.2 -- groups in the alkyl group by any of --O--, --S--, --CH.dbd.CH-- or --C.tbd.C--, provided that two or more --CH.sub.2 -- groups are not consecutively replaced by either --O-- or --S--; and Z.sub.1 and Z.sub.2 each independently represents a covalent bond or 1,2-ethylene group, provided that when both Z.sub.1 and Z.sub.2 are a covalent bond, R and R' are not straight-chain alkyl groups each having the same chain length.
摘要:
Liquid crystalline compounds are disclosed which compounds are expressed by general formula (1) ##STR1## wherein R.sub.1 represents an alkyl group having 1 to 10 carbon atoms, ring A represents 1,4-phenylene or 1,4-cyclohexylene, each of X.sub.1, X.sub.2, X.sub.3, and X.sub.4 independently represents hydrogen atom or fluorine atom, Y.sub.1 represents CF.sub.3 or OCF.sub.3, and each of m, n, and p is independently an integer of 1 or 0. The liquid crystalline compounds have a wide temperature. The liquid crystalline compounds have a wide temperature range of nematic phase, low viscosity, large positive .DELTA..epsilon., high chemical stability, high miscibility with other liquid crystalline compounds at low temperatures, small temperature dependency of viscosity and .DELTA..epsilon., extremely high specific resistance (high voltage holding ratio), and good UV stability, and are preferably used for TFT. Also, disclosed are liquid crystal compositions containing the liquid crystalline compounds mentioned above, and liquid crystal display devices using the liquid crystal composition.
摘要翻译:公开了液晶化合物,其中化合物由通式(1)表示,其中R 1表示具有1-10个碳原子的烷基,环A表示1,4-亚苯基或1,4-亚环己基,各自为X1,X2,X3 X 4独立地表示氢原子或氟原子,Y1表示CF 3或OCF 3,m,n和p各自独立地为1或0的整数。液晶化合物的温度宽。 液晶化合物具有宽的向列相温度范围,低粘度,大的正DELTAε,高化学稳定性,低温下与其它液晶化合物的高混溶性,粘度和DELTAε的温度依赖性低,电阻率极高( 高电压保持率),良好的紫外线稳定性,优选用于TFT。 此外,还公开了含有上述液晶化合物的液晶组合物和使用该液晶组合物的液晶显示装置。
摘要:
Provided are a polymerizing liquid-crystalline compound of formula (1). In formula (1), Q1 to Q4 each independently represent a formula (2), a hydrogen atom, a halogen atom, an alkyl group or the like; at least two of Q1 to Q4 are a formula (2) and may differ from each other. In formula (2), A independently represent a 1,4-cyclohexylene group, a 1,4-phenylene group or the like; X independently represents a single bond, an alkylene group or the like; Z represents a single bond, —COO—, —OCO— or the like; n indicates an integer of from 0 to 3; p represents any one polymerizing group of formulae (P1) to (P8); W represents a hydrogen atom, a halogen atom, an alkyl group or the like. When Q1 and Q2 are both hydrogen atoms and when Q3 and Q4 are both formula (2), then p must not be (P8).
摘要:
Disclosed are liquid crystalline compounds which (i) are characterized in that the compounds have a wide temperature range in which the compounds exhibit a liquid crystal phase, are low in viscosity, and have a negative and large &Dgr;&egr;, (ii) are readily mixed with other various liquid crystal materials even at low temperatures, and (iii) are useful as component of liquid crystal compositions suitable both for TFT type display mode and IPS mode; and liquid crystal composition comprising the liquid crystalline compound; the compounds are expressed by the general formula (1) wherein R1 represents an alkyl group having 1 to 15 carbon atoms; ring A1, ring A2, and ring A3 independently represent trans-1,4-cyclohexylene group, trans-1,4-silacyclohexylene group, pyrimidine-2,5-diyl group, pyridine-2,5-diyl group, 1,3-dioxane-2,5-diyl group, tetrahydropyran-2,5-diyl group, 1,3-dithian-2,5-diyl group, or tetrahydrothiopyran-2,5-diyl group, or 1,4-phenylene group in which one or more hydrogen atoms on the six-membered ring may be replaced by a halogen atom; X1, X2, and X3 independently represent —(CH2)4—, —(CH2)3O—, —O(CH2)3—, or single bond; Y1 represents hydrogen atom or an alkyl group having 1 to 15 carbon atoms; m and n are independently 0 or 1; and any atom which constitutes this compound may be replaced by its isotope.
摘要:
The present invention is to provide liquid crystalline compounds having a wide temperature range of a liquid crystal phase, low viscosity, and large ratio of elastic constants; liquid crystal compositions comprising the compound; and liquid crystal display devices comprising the composition; the liquid crystalline compounds being fluoroalkenyl derivatives expressed by the general formula (1) ##STR1## wherein A.sub.1, A.sub.2, A.sub.3, and A.sub.4 independently represent trans-1,4-cyclohexylene group or 1,4-phenylene group; Z.sub.1, Z.sub.2, and Z.sub.3 independently represent --(CH.sub.2).sub.2 --, --CH.dbd.CH--, --C.ident.C--, or a single bond; Q represents H or F; l is an integer of 1 to 5; m, n, and o are independently an integer of 0 to 5; p and q are independently an integer of 0 or 1; and each element which constitutes the derivatives may be an isotope of the element.
摘要:
A difluorophenyl derivative compound having characteristics of a liquid crystal represented by the following general formula (1), a liquid crystal composition and a liquid crystal display device in which the composition is used: wherein R0 is an alkyl group or an alkenyl group having 1 to 15 carbon atoms, and an optional methylene group in the alkyl group or the alkenyl group may be substituted by an oxygen atom; A1 and A2 are each a trans-1,4-cyclohexylene group, or one group selected from the group consisting of a 1,4-phenylene group, a pyrimidine-2,5-diyl group, a pyridine-2,5-diyl group, a 1,3-dioxane-2,5-diyl group, a tetrahydropyran-2,5-diyl group, a 1,3-dithian-2,5-diyl group and a tetrahydrothiopyran-2,5-diyl in which one or more hydrogen atoms on a six-membered ring may be substituted by halogen atoms; Z1 and Z2 are each —(CH2)4—, —(CH2)3O—, —O(CH2)3— or a single bond; and X1 and X2 are each H, F, Cl or Br.