46results about How to "High limit temperature" patented technology

Provided are: a liquid-crystalline compound which satisfies at least one property selected from high stability to light, a high clear point, a low lower-limit temperature of a liquid crystal phase, a low viscosity, proper optical anisotropy, high dielectric anisotropy, a high dielectric constant in a short axis direction, a proper elastic constant, excellent compatibility and the like; a liquid crystal composition which contains the compound; and a liquid crystal display element comprising the composition. A compound represented by formula (1). For example, R1 represents an alkyl group having 1 to 15 carbon atoms, rings A1 to A4 independently represent 1,4-cyclohexylene or 1,4-phenylene, Z1 to Z4 independently represent a single bond, -(CH2)2-, -COO- or -CH2O-, X1 represents a halogen atom, -C≡N, -CF3 or -OCF3, L1 and L2 independently represent a hydrogen atom or a fluorine atom, Y1 and Y2 independently represent a fluorine atom, and a, b, c and d independently represent 0 or 1 wherein the sum total of a, b, c and d is 1 or 2.

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.

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).

The purpose of the present invention is to provide a liquid crystal composition having the appropriate balance in relation to at least one or at least two characteristics from among characteristics such as the following: a high nematic phase upper-limit temperature; a low nematic phase lower-limit temperature; low viscosity; appropriate optical anisotropy; large dielectric anisotropy; large relative permittivity; high stability with respect to ultraviolet rays or heat; and a large elastic constant. A further purpose is to provide an active matrix element that has: a short response time; a large voltage retention rate; a low threshold voltage; a large contrast ratio; a large negative DC luminance relaxation time constant; and a long life. Provided are the following: a liquid crystal composition that has positive dielectric anisotropy, that contains, as an additive component, a compound which contributes to high-stability with respect to heat or ultraviolet rays, and that contains, as a first component, a prescribed compound having low viscosity; and a liquid crystal display element that contains the composition. The composition may contain the following: a prescribed compound which serves as a second component and has large positive dielectric anisotropy; a prescribed compound which serves as a third component and which has a high upper-limit temperature or low viscosity; or a prescribed compound which serves as a fourth component and which has negative dielectric anisotropy.

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.