42results about How to "Lower limit temperature" patented technology

Provided is a polar compound which has high chemical stability and high ability of aligning liquid crystal molecules, and which enables the achievement of high voltage holding ratio if used for a liquid crystal display element. A compound represented by formula (1). (In the formula, R1 represents, for example, an alkyl group having 1-15 carbon atoms; each of rings A1-A5 represents 1,4-cyclohexylene or 1,4-phenylene; each of Z1 and Z5 represents a single bond or an alkylene group having 1-10 carbon atoms; each of a and b represents a number of 0-4, and the sum of a and b is 4 or less; d represents a number of 1-4; each of c and e represents a number of 0-4; each of P1-P3 represents a polymerizable group represented by one of formulae (P-1)-(P-5), wherein each of M1-M3 represents a hydrogen atom or an alkyl group having 1-5 carbon atoms; and R2 represents a group represented by one of formulae (1a)-(1c), wherein each of Sp1-Sp5 represents a single bond or an alkylene group having 1-10 carbon atoms, S1 represents >CH-, S2 represents >C<, and X1 represents -OH.)

Provided is a liquid crystal compound, which has large dielectric anisotropy, a high voltage retention rate and good stability in the presence of light and heat, becomes a nematic phase within a broad temperature range, has the appropriate optical anisotropy, and has excellent compatibility with other liquid crystal compounds, particularly a liquid crystal compound having large dielectric anisotropy. The compound is represented by formula (1) (1) where, for instance, R1 is a C1-20 alkyl, rings A1, A2, A3, A4, A5 and A6 are, independently, 1,4-cyclohexylene or 1,4-phenylene; Z1, Z2, Z3, Z4, Z5, Z6 and Z7 are, independently, single bonds, -(CH2)2-, -COO-, -OCO-, -CF2O-, -OCF2-, or -CH=CH-; X1 is a fluorine, -CF3, or -OCF3; and Y1 and Y2 are, independently, hydrogen or fluorine.

Provided are: a liquid crystal compound satisfying at least one physical property such as high stability with respect to heat, light, and the like, high clearing point, low lower-limit temperature in the liquid crystal phase, low viscosity, suitable optical anisotropy, large dielectric constant anisotropy, suitable elastic constants, and exceptional compatibility with other liquid crystal compounds; a liquid crystal composition containing this compound; and a liquid crystal display element including this composition. A compound represented by formula (1). In formula (1), for example, R1 is a C1-C15 alkyl; ring A1 and ring A2 are 1,4-cyclohexylene, 1,4-cyclohexenylene, 1,4-phenylene, 1,4-phenylene having at least one hydrogen substituted by a halogen, tetrahydropyran-2,5-diyl, or 1,3-dioxan-2,5-diyl; Z1 and Z2 are a single bond or -CF2O-; L1, L2, and L3 are halogen or hydrogen; and a is 0-3.

The present invention provides a liquid-crystal display element having properties such as a wide temperature range where the element is usable, a short response time, a high voltage holding ratio, a low threshold voltage, a high contrast ratio, and a long life. The liquid-crystal display element of the present invention comprises a first substrate, a plurality of pixel electrodes formed on the first substrate, a second substrate, counter electrodes formed on the second substrate and facing the pixel electrodes, a liquid-crystal layer present between the pixel electrodes and the counter electrodes and comprising a liquid-crystal composition, and alignment control layers constituted of a polymer comprising an aligning monomer, which was a component of the liquid-crystal composition, and formed respectively on the first-substrate side and the second substrate side. The aligning monomer is a polymerizable polar compound comprising both a mesogen moiety constituted of at least one ring anda polar group. Due to this, the alignment control layers in the liquid-crystal display element of the present invention can perpendicularly align the liquid-crystal compound contained in the liquid-crystal composition, without the necessity of forming an alignment film.

A compound represented by formula (1). For example, R1 represents an alkyl group having 1-15 carbon atoms; MES represents a mesogenic group having at least one ring; Sp1 represents a single bond or analkylene group having 1-10 carbon atoms; M1 represents a methyl group; and each of R2, M2 and M3 represents a hydrogen atom.(img file='DDA0001544777320000011. TIF'wi='830' he='270' / )

Disclosed is a liquid crystal composition that satisfies at least one property of a high upper limit temperature of a nematic phase, a low lower limit temperature of a nematic phase, a low viscosity, a proper optical anisotropy, a negatively large permittivity anisotropy, a large specific resistance, a high stability against ultraviolet light, a high stability against heat and the like, or has a proper balance between at least two of the above properties. Also disclosed is an AM element possessing a short response time, a large voltage retention, a large contrast ratio, and a long service life and the like. The liquid crystal composition that comprises a specific fluorine substituted tetracyclic compound having a high upper limit temperature as a first component and a specific compound having a negatively large permittivity anisotropy as a second component and has a negative permittivity anisotropy. Further disclosed is a liquid crystal display element comprising the composition.

The present invention addresses the problem of providing: a polymerizable compound having suitable polymerization reactivity, a high conversion rate, a low polymerization initiation temperature, and ahigh solubility in a liquid crystal composition; a liquid crystal composition containing said compound; and a liquid crystal display device containing said composition. To resolve the problem, a compound represented by formula (1), and a liquid crystal composition containing said compound are provided. In formula (1), R<1>, R<2>, and R<3> are each independently an alkyl, etc.; n is 0, etc.; ringA<1> is phenyl, etc.; ring A<2> and ring A<3> are each independently 1,4-phenylene, etc.; Z<1> and Z<2> are each independently a single bond, etc.; Sp<1>-Sp<4> are single bonds, etc.; a is 1, etc.; c,d, and e are each independently 0 or 1; the sum of c, d, and e is 1, etc.; P<1>-P<4> are polymerizable groups; and at least one among P<1>-P<4> is a polymerizable group represented by formula (P-1).

Provided is a liquid crystalline compound that exhibits at least one physical property such as high stability to heat, light, or the like, a high clearing point, a low liquid crystal phase lower limit temperature, a low viscosity, suitable optical anisotropy, a high negative dielectric anisotropy, suitable elastic constant and excellent compatibility with other liquid crystalline compounds. The liquid crystalline compound is represented by formula (1). In the formula, for example, R1 and R2 are each an alkyl group having 1-15 carbon atoms, ring A1, ring A2 and ring A3 are each a 1,4-cyclohexylene ring or a 1,4-cyclohexenylene ring, Z1, Z2 and Z3 are each a single bond or -(CH2)2-, a, b and c are each 0 or 1, and the sum of a, b and c is 0, 1 or 2.

The first purpose is to provide a liquid crystal compound which is stable to heat, light and so on, and has a high refractive index anisotropy, a high dielectric anisotropy and a low melting point. The second purpose is to provide a liquid crystal medium having a liquid crystal phase which is stable to heat, light and so on, has a wide liquid crystal phase temperature range, a high refractive index anisotropy and a high dielectric anisotropy, and is optically isotropic. The third purpose is to provide optical elements of various types which comprise the liquid crystal medium, are usable over a wide temperature range and have a short response time, a large contrast and a low drive voltage. Disclosed are a liquid crystal compound having branched alkyl or alkenyl, said liquid crystal compound being represented by formula (1), a liquid crystal medium (a liquid crystal composition or a polymer / liquid crystal complex) containing said liquid crystal compound, optical elements comprising said liquid crystal medium, and so on; in formula (1), R1 represents, for example, branched alkyl or branched alkenyl having 3-20 carbon atoms; the rings A1, A2, A3, A4 and A5 represent, for example, 1,4-phenylene or 1,3-dioxan-2,5-diyl; Z1, Z2, Z3 and Z4 independently represent, for example, a single bond or alkylene having 1 to 4 carbon atoms; Y1 represents, for example, fluorine; and m, n and p independently represent 0 or 1, satisfying the requirement 1<=m+n+p<=3.

Since a switching element using a nematic liquid crystal medium has a long response time, there is a limit to the number of control instances over a certain time. By using a liquid crystal compositionexhibiting an optical isotropic phase, an element capable of performing polarization control at high speed is provided. A mixture comprising the liquid crystal composition and polymerizable monomers,a polymer / liquid crystal composite material obtained by polymerizing the mixture, an element comprising the liquid crystal composition or the polymer / liquid crystal composite, and a LIDAR comprisingthe element are provided.

The invention provides a liquid crystal compound having general physical properties necessary for a liquid crystal compound, that is to say, stability to heat, light or the like, a small viscosity, a suitable value of refractive index anisotropy, a suitable value of dielectric anisotropy, steep characteristics electro-optic characteristics, a wide temperature range of a nematic phase and an excellent compatibility with other liquid crystal compounds, and a liquid crystal compounds especially having a wide temperature range of a nematic phase. A compound represented by formula (1). For example, R 1 and R 2 are each independently alkyl having 1 to 9 carbons or alkenyl having 2 to 9 carbons, alkoxy having 1 to 8 carbons or alkenyloxy having 2 to 8 carbons; Q 1 and Q 4 are each independently fluorine or chlorine; Q 2 and Q 3 are each independently hydrogen, fluorine or chlorine, and one of Q 2 and Q 3 is hydrogen; Z is -CH 2 O or -COO-; and h is 1 or 2.

Provide a compound with large refractive index anisotropy, large dielectric constant anisotropy, and low melting point; and a compound with a wide temperature range of liquid crystal phase, large refractive index anisotropy, large dielectric constant A liquid crystal medium with constant anisotropy and an optically isotropic liquid crystal phase. The present invention is a liquid crystal compound having a chlorobenzene ring, and a liquid crystal medium characterized by containing the liquid crystal compound and a chiral agent and exhibiting an optically isotropic liquid crystal phase.

Disclosed is a novel compound, namely a pentacyclic liquid crystal compound having a CF2O bonding group, which has general physical properties necessary for a compound, stability against heat and light, a wide temperature range of a liquid crystal phase, a high clearing point, good compatibility with other compounds, and large dielectric anisotropy and large refractive anisotropy. This pentacyclic liquid crystal compound has a particularly high clearing point and particularly large refractive anisotropy. Also disclosed are a liquid crystal composition and a liquid crystal display.

The invention provides a polymeric compound and its polymer, a liquid crystal composition and a liquid crystal display element. A polymerizable compound having suitable polymerization reactivity, high conversion rate and good solubility in liquid crystal composition is provided. Provides high upper limit temperature of nematic phase, low lower limit temperature of nematic phase, small viscosity, suitable optical anisotropy, large dielectric constant anisotropy, suitable elastic constant, large specific resistance , and a liquid crystal composition having physical properties such as suitable pretilt. To provide liquid crystal display elements with wide temperature range, short response time, high voltage retention, low threshold voltage, high contrast, suitable pretilt and long life. A compound represented by formula (1), a liquid crystal composition, and a liquid crystal display element.