摘要:
To provide a liquid crystalline compound capable of exhibiting a biaxial liquid crystal phase, provide a trifunctional or greater functional polymerizable liquid crystalline compound having polymerizable groups, and also to provide a liquid crystalline composition and a retardation film which are using the liquid crystalline compound, a compound and a liquid crystalline compound each are represented by formula (I) defined in the specification; a liquid crystalline composition contains the compound; and a retardation film has an optically anisotropic layer formed from the compound.
摘要:
Supertwist liquid-crystal displays (SLCDs) with outstanding properties are obtained if the nematic liquid-crystal mixtures used therein comprise at least one compound selected from the formulae 1A and 1B ##STR1## and at least one compound of the formula 1C ##STR2## in which R.sup.a is alkyl, alkoxy, alkenyl or alkenyloxy having 1 to 12 carbon atoms,R.sup.b is alkyl or alkoxy having 1 to 5 carbon atoms,Z is --COO--, --CH.sub.2 CH.sub.2 -- or a single bond, andL.sup.a, L.sup.b, L.sup.c, L.sup.d, L.sup.e, L.sup.f, L.sup.g, and L.sup.h in each case independently of one another are H or F,with the proviso that the 1,4-phenylene rings carry not more than 2 fluorine atoms per ring,R.sup.3 is an alkenyl group having 2 to 7 carbon atoms,R.sup.4 is R.sup.a or R.sup.3 andc is 0 or 1.
摘要:
The present invention provides a difluoro-derivative compound of the formula R.sup.1 --(A.sup.1 --Y.sup.1).sub.m --A.sup.2 --CF.dbd.CF--C.tbd.C--A.sup.3 --(Y.sup.2 --A.sup.4).sub.n --R.sup.2 (wherein each of A.sup.1 to A.sup.4 is a trans-1,4-cyclohexylene group, a 1,4-cyclohexenylene group or a 1,4-phenylene group, each of m and n is 0 or 1, and each of R.sup.1 and R.sup.2 is a C.sub.1-10 alkyl group, a halogen atom or a cyano group).The compound of the present invention has a low viscosity and is stable against lights, and a high speed response is expected by using it for a liquid crystal composition.
摘要:
Ethyne derivatives of the formula IR.sup.1 --(A.sup.1 --Z.sup.1).sub.m --A.sup.3 --C.tbd.C--A.sup.4 --(Z.sup.2 --A.sup.2).sub.n --R.sup.2 Iwherein R.sup.1, A.sup.1, Z.sup.1, m, A.sup.3, A.sup.4, .sub.2 Z.sup.2 and n have the meaning given in Claim 1 and R.sup.2 is --OCF.sub.3, --OC.sub.2 F.sub.4 H or --OC.sub.2 F.sub.5, are suitable as components of liquid crystal phases.
摘要:
Provided is a liquid crystal composition satisfying at least one or having suitable balance regarding at least two of characteristics such as high maximum or low minimum temperature of a nematic phase, large optical anisotropy, large positive dielectric anisotropy and high stability to ultraviolet light, and a liquid crystal display device including such a composition, particularly an encapsulated liquid crystal display device, and a liquid crystal display device serving as a constituent of 3D lenses. The liquid crystal composition contains a specific compound having large optical anisotropy as a first component, and a specific compound having large optical anisotropy and large positive dielectric anisotropy as a second component; a specific compound having large positive dielectric anisotropy as a third component; and a specific compound having large optical anisotropy and further having high maximum or low minimum temperature as a fourth component, and the liquid crystal display device includes the composition.
摘要:
A liquid crystalline alkenyltolan derivative expressed by the general formula CtH2t−1—G—(CH2)m—A1—B1—(A2—B2)n—(A3—B3)p—A4—X wherein A1, A2, A3, and A4 independently represent a 1,4-cyclohexylene, 1,4-phenylene in which one or two hydrogen atoms may be replaced by a fluorine atom(s), dioxane-2,5-diyl, or pyrimidine-2,5-diyl group; B1, B2, and B3 independently represent a covalent bond, an 1,2-ethylene, 1,2-ethenylene, 1,2-ethynylene, oxymethylene, methylenoxy, carbonyloxy, or 1,4-butylene group provided that at least one of B1, B2, and B3 represents an 1,2-ethynylene group; G represents a covalent bond or an oxygen atom; CtH2t−1 represents an alkenyl group having t carbon atoms; n and p are each 0 or 1; and X represents an alkyl group having 1 to 10 carbon atoms. The derivative provides a liquid-crystal compound and a liquid-crystal composition which have high anisotropy, high elastic constant ratio, excellent comparability with other liquid-crystal compounds, and low viscosity and are chemically and physically stable.
摘要:
R.sub.1 --A--(X).sub.m --(B).sub.n --R.sub.2 (I) R.sub.3 --J--(Y).sub.p --(Z).sub.q --R.sub.4 (II) Liquid crystal compounds of formula (I) are described, where formula (I) is given as R.sub.1 --A--(X).sub.m --(B).sub.n --R.sub.2 where A is selected from nathyl, fluorinated naphthyl, brominated naphthyl, B is selected from phenyl, methylated phenyl, brominated phenyl, fluorinated phenyl, thiophene, pyrimidine and pyridine, R.sub.1 and R.sub.2 are independently selected from alkyl, alkoxy, alkynyl, thioalkyl, Br, CN, SCN, NCS, perfluoroalkyl, perfluoroalkoxy and hydrogen, X is selected from C.tbd.C, COO and C.tbd.C, m is 0 or 1, n is 0 or 1 where m is 1 and n is 0 where m is 0; provided that where A is naphthyl, n is 1 and m is 0 then B is selected from methylated phenyl, brominated phenyl, thiophene, pyrimidine and pyridine; and further provided that where A is naphthyl, X is C.tbd.C, m is 1 and n is 1, then B is selected from thiophene, pyrimidine and pyridine. Also described are liquid crystal compounds suitable for inclusion in devices utilizing pretransitional characteristics of liquid crystalline materials in the isotropic phase and described by formula (II): R.sub.3 --J--(Y).sub.p --(Z).sub.q --R.sub.4, where J is selected from nathyl, fluorinated naphthyl, brominated naphthyl, Z is selected from phenyl, methylated phenyl, brominated phenyl, fluorinated phenyl, thiophene, pyrimidine and pyridine, R.sub.1 and R.sub.2 are independently selected from alkyl, alkoxy, alkynyl, thioalkyl, Br, CN, SCN, NCS, perfluoroalkyl, perfluoroalkoxy and hydrogen, Y is selected from C.dbd.C, COO and C.dbd.C, p is 0 or 1, q is 0 or 1 where p is 1 and q is 0 where p is 0.
摘要:
The present invention provides compounds of the general formula: ##STR1## wherein R is an alkyl group with 1 to 12 carbon atoms or a group of the formula ##STR2## Ring A.sup.1 is 1,4-phenylene, which is unsubstituted or substituted with fluorine, pyridine-2,5-diyl or pyrimidine-2,5-diyl;Ring A.sup.2 is trans-1,4-cyclohexylene or trans-1,3-dioxane-2,5-diyl;R.sup.1 is an alkyl, alkenyl or alkoxyalkyl group with 1 to 12 and, respectively, 2 to 12 carbon atoms;X.sup.1 is fluorine, chlorine, bromine, trifluoromethyl, trifluoromethoxy or difluoromethoxy; andX.sup.2, X.sup.3 each independently are hydrogen or fluorine.The invention is also concerned with liquid crystal mixtures which contain these compounds and with the use of these compounds and mixtures for electro-optical purposes.
摘要:
Fluoro-substituted phenyl-cyclohexylacetylenes have the formula: ##STR1## wherein R signifies alkyl, alkoxy, alkenyl or alkenyloxy with 1 or, respectively, 2 to 12 carbon atoms in which one CH.sub.2 group can be replaced by oxygen and/or one or more hydrogen atoms can be replaced by fluorine atoms, with the proviso that two oxygen atoms are not directly adjacent;A.sup.1 represents 1,4-phenylene, pyridine-2,5-diyl, pyrimidine-2,5-diyl, trans-1,4-cyclohexylene or trans-1,3-dioxane-2,5-diyl;A.sup.2 signifies trans-1,4-cyclohexylene or 1,4-phenylene which is optionally substituted with fluorine;Z.sup.1 signifies a single covalent bond, --CH.sub.2 CH.sub.2 --, --OCH.sub.2 --, --CH.sub.2 O--, --(CH.sub.2).sub.4 --, --O(CH.sub.2).sub.3 --, --(CH.sub.2).sub.3 O-- or, when ring A.sup.1 represents a saturated ring, also the trans form of --CH.dbd.CH(CH.sub.2).sub.2 -- or --CH.dbd.CHCH.sub.2 O--;Z.sup.2 signifies a single covalent bond, --CH.sub.2 --CH.sub.2 --, --OCH.sub.2 --, --CH.sub.2 O--, --(CH.sub.2).sub.4 --, --O(CH.sub.2).sub.3 --, --(CH.sub.2).sub.3 O-- or the trans form of --CH.dbd.CH(CH.sub.2).sub.2 -- or --CH.dbd.CHCH.sub.2 O--;n signifies 0 or 1;m signifies 0 or 1, with the proviso that n+m is
摘要:
Ethyne derivatives of the formula IR.sup.1 --(A.sup.1 --Z.sup.1).sub.m --A.sup.3 --C.tbd.C--A.sup.4 -(Z.sup.2 -A.sup.2).sub.n --R.sup.2 Iwherein R.sup.1, A.sup.1, Z.sup.1 m, A.sup.3, A.sup.4, Z.sup.2, A.sup.2, n and R.sup.2 have the meaning given in claim 1 are suitable as components of liquid crystal phases.