摘要:
Liquid-crystalline compounds which have an extremeley high voltage retention, an extremely small temperature dependence of the retention, a low threshold voltage, and a large value of Δn; a liquid-crystal composition containing any of the liquid-crystal compounds; and a liquid-crystal display element containing the liquid-crystal composition. The compounds are represented by general formula (1), wherein R represents C1-20 alkyl, in which arbitrary non adjacent methylene groups (-CH2-) may have been replaced with oxygen atoms (-O-); Y1 to Y16 each independently represents hydrogen or fluorine, provided at least two of them are fluorine atoms and that at least two hydrogen atoms of each 1,4-phenylene group have not been replaced with fluorine atoms; X represents halogeno or C1-20 alkyl in which arbitrary non adjacent methylene groups may have been replaced with oxygen atoms and any hydrogen has optionally been replaced with fluorine; and Z1, Z2, and Z3 each independently represents -(CH2)2-, -(CH2)4-, -CH2O-, -OCH2-, -(CH2)3O-, -O(CH2)3- or a single bond; and each atom contained in this compound may have been replaced with an isotope thereof; provided when X is -OCF2CF2H, Z1 and Z3 are both single bonds, and Z2 is -(CH2)2-, then none of Y6, Y10, and Y12 is F, and none of Y1 to Y5, Y7 to Y9, Y11, and Y13 to Y16 is H; none of Y2, Y10, and Y12 is F, and none of Y1, Y3 to Y9, Y11, and Y13 to Y16 is H; or none of Y2, Y4, Y10, and Y12 is F and none of Y1, Y3, Y5 to Y9, Y11, and Y13 to Y16 is H.
摘要:
A novel liquid crystal compound represented by general formula (1), and a liquid crystal composition containing the same and having a high clearing point and a viscosity reducing effect suitable for use as a liquid crystal display element. In formula (1) R1 represents C1-C12 alkyl wherein one CH2 group may be replaced by oxygen or -CH=CH-; X represents hydrogen or fluorine; Y represents hydrogen or C1-C5 alkoxy; 1 and m represent each independently 0 or 1; and n and p represent each independently an integer of 0 to 10; provided n is at least 1 when p is 0, and X represents fluorine and p represents 0 when Y represents alkoxy.
摘要:
Liquid crystal compounds which exhibit a liquid crystal phase in a wide temperature range and are lowly viscous and excellent in chemical stability and compatibility with other liquid crystal materials; liquid crystal compositions containing the compounds; and liquid crystal display devices made by using the compositions. The above liquid crystal compounds are represented by the general formula (1): Ra-A1-Z1-A2-Z2-A3-Z3-A4-Rb wherein Ra is alkenyl or alkyl wherein one or more methylene groups may be replaced by -O-, -S-, -CO-, -C C- and so on; Rb is Ra, halogeno or cyano, with the proviso that at least either of Ra and Rb must be a group containing a double bond; A1, A2, A3 and A4 are each independently trans-1,4-cyclohexylene, 1,4-phenylene, cyclohexenediyl, pyridine-2,5-diyl, pyrimidine-2,5-diyl or 1,3-dioxane-2,5-diyl; and Z1, Z2 and Z3 are each independently C2-C4 alkenylene, -(CH2)2-, -COO-, -C C-, -CH2O-, a single bond or the like, at least one of Z1, Z2 and Z3 being C2-C4 alkenylene.
摘要:
Oragnosilicon compounds represented by the general formula (1): Ra-A-(-Z1-A1-)-m-(-Z2-A2-)-n-(-Z3-A3-)-o-Rb, excellent in the compatibility with other liquid-crystal materials, reduced in viscosity, and improved in threshold voltage, wherein at least one of Ra, Rb, Z1, Z2 and Z3 has an -SiH2 group; Ra represents hydrogen or C1-C2 alkyl wherein at least one -CH2- group may be substituted by -SiH2-, -O-, -S-, -CO-, -CH=CH-, -CC- or 1,4-cyclobutylene; Rb represents a group of any of the Ra groups, halogeno or CN; A, A1, A2 and A3 represent each a bivalent ring group; Z1, Z2 and Z3 represent each independently a covalent bond or -(CH2)p- wherein at least one -CH2- group may be substituted by -SiH2-, -O-, -S-, -CO-, -CH=CH- or -CC-; p represents an integer of 1 to 4; and m, n and o represent each independently 0 or 1.
摘要:
Liquid crystal compositions containing at least one compound represented by general formula (1') as a first component and at least one compound represented by any of general formulae (2-1) to (2-5) as a second component, wherein n represents an integer of 1 to 10; X represents H or F; and m represents 1 or 2.
摘要:
Liquid-crystal compounds represented by general formula (1) (wherein X1, X2 and X3 are each -CH2O-, -OCH2-, -(CH2)3O-, -O(CH2)3-, a covalent bond, -CF2O-, -OCF2-, -CH=CH-, -C C-, -CH2CH2-, -(CH2)4-, -CH=CH-CH2CH2- or -CH2CH2-CH=CH-, with the proviso that at least one of them is -CH2O-, -OCH2-, -(CH2)3O- or -O(CH2)3-; R1 is C2-C20 alkenyl; Y1 is halogeno, cyano or substituted or unsubstituted C1-C20 alkyl; the rings A1, A2, A3 and A4 are each substituted or unsubstituted 1,4-cyclohexylene, 1,4-cyclohexenylene or 1,4-phenylene; and m and n are each 0 or 1); and a liquid-crystal composition and a liquid-crystal display element containing at least one of these compounds. The compounds exhibit steep threshold value characteristics, an excellent compatibility, a low viscosity, a quick response, and so on.
摘要:
Liquid crystal compounds being excellent in compatibility with other liquid crystal materials and stability and having a low viscosity and a high isotropic phase transition temperature; a liquid crystal composition containing at least one of the compounds, and a liquid crystal display element using the composition. The abovbe compounds are represented by the following general formula (I): R-A1-Z1-A2-Z2-A3-Z3-A4-(-CH2-)-mX, wherein R is H or C1 to C10 alkyl (one or more methylene (-CH2-) groups of which may be replaced by -O- or the like); m is an integer of 1 to 10; X is F, Cl, Br, I or OH; A1, A2, A3 and A4 are each trans-1,4-cyclohexylene or the like; and Z1, Z2 and Z3 are each independently -(CH2)2- or a covalent bond, with at least two of Z1, Z2 and Z3 being covalent bonds.
摘要:
To provide a liquid crystal compound, a dicyclohexylethylene derivative, which has a wide liquid crystal phase temperaturerange, a low viscosity, a large Δ⊂ value, a high stability, and an excellent compatibility with other liquid crystal compounds. A dicyclohexylethylene derivative represented by general formula (I), wherein R represents C1-C10 linear alkyl; and X represents fluorine or trifluoromethyl. This compound can widen the working range of a liquid crystal display element because of its high NI point, can improve the response speed of the display element because of its low viscosity, and can lower the voltage for driving the display element because of its high positive Δ⊂ value. Furthermore, it is so stable against changes in environmental factors that it can be used in various liquid crystal display elements of, for example, active matrix drive type using TFT.
摘要:
Liquid-crystal compounds represented by the general formula (1): Ra-A1-Z1-A2-Z2-A3-(-Z3-A4-)-m-Rb and having a liquid-crystal phase over a wide temperature range, a low viscosity, and an improved threshold voltage; a liquid-crystal composition; and a liquid-crystal display element containing the liquid-crystal composition (1), wherein Ra represents C1-20 alkyl in which at least one -CH2- may be replaced with -O-, etc. and at least one hydrogen atom may be replaced with a halogen atom; Rb is the same as Ra or is halogeno or cyano; A1, A2, A3, and A4 each independently represents a divalent ring group; Z1, Z2, and Z3 each independently represents C2-C4 alkenylene, -COO-, a covalent bond, etc., provided that at least one of Z1, Z2, and Z3 represents C2-C4 alkenylene and at least one of them represents -COO- or -OCO-; and m is 0 or 1.
摘要:
Compounds represented by general formula (1), which exhibit nematic liquid crystal phases over widened temperature ranges and are lowered in viscosity and improved in low-temperature compatibility with other liquid crystal compounds and chemical stability as compared with the liquid crystal compounds of the prior art, wherein H1 to H8 are each hydrogen or halogeno, with at least one member of them being halogeno; R1 is C2-C20 alkyl wherein one methylene (-CH2-) group or two or more methylene groups that are not adjacent to each other are replaced by ethereal oxygen (-O-); Y1 is C1-C20 alkyl wherein one or more methylene groups may be replaced by oxygen, sulfur, dihydroxysilyl, dimethylsilylene, -CH=CH-, and/or -CC-; and X1 to X3 are each a covalent bond, 1,2-ethylene or 1,4-butylene.