Liquid crystal composition
AssigneeDainippon Ink and Chemicals, Inc.
InventorsShinji Ogawa, Masashi Osawa, Hiroyuki Ohnishi, Haruyoshi Takatsu, Kiyofumi Takeuchi, Shotaro Kawakami, Takeshi Kuriyama
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Abstract
A liquid crystal composition comprises as a first liquid crystal component a compound represented by the following general formula (I): and as a second liquid crystal component a compound selected from the group consisting of compounds represented by the following general formulae (II) and (III): and has a nematic phase upper temperature limit of 75° C. or higher and Δn of from 0.07 to 0.18.
Claims18
A liquid crystal composition comprising as a first liquid crystal component at least one compound selected from the group consisting of compounds represented by the following general formula (I):
- wherein R1 represents a C2-16 alkenyl group or a C3-16 alkenyloxy group
- and as a second liquid crystal component at least one compound selected from the group consisting of compounds represented by the following general formulae (II) and (III):
- wherein R2, R3 and R4 each independently represents a C1-16 alkyl or alkoxy group which may be substituted by a fluorine atom, a C2-16 alkenyl group which may be substituted by a fluorine atom, a C3-16 alkenyloxy group which may be substituted by a fluorine atom or a C1-10 alkoxyl group-substituted C1-12 alkyl group which may be substituted by a fluorine atom;
- the rings A, B, C, D and E each independently represents a 1,4-phenylene group, 2-methyl-1,4-phenylene group, 3-methyl-1,4-phenylene group, naphthalene-2,6-diyl group, phenanthrene-2,7-diyl group, fluorene-2,7-diyl group, trans-1,4-cyclohexylene group, 1,2,3,4-tetrahydronaphthalene-2,6-diyl group, decahydronaphthalene-2,6-diyl group, trans-1,3-dioxane-2,5-diyl group, pyridine-2,5-diyl group, pyrimidine-2,5-diyl group, pyrazine-2,5-diyl group or pyridazine-2,5-diyl group, each of which may be substituted by a fluorine atom;
- l and m each independently represents 0, 1 or 2;
- Z1, Z2, Z3 and Z4 each independently represents a single bond, —CH2CH2—, —(CH2)4—, —OCH2—, —CH2O—, —CH═CH—, —CH═N—N═CH— or —C≡C—;
- X2 represents a cyano group, a fluorine atom, a chlorine atom, a trifluoromethoxy group, a trifluoromethyl group, a difluoromethoxy group, a hydroxy atom, a 3,3,3-trifluoroethoxy group, R′ or —OR′ in which R′ represents a C1-12 straight-chain alkyl group or a C2-12 straight-chain alkenyl group;
- and X1 and X3 each independently representss a hydrogen atom, a fluorine atom or a chlorine atom, with the proviso that when R4 is an alkenyl or alkenyloxy group, X2 is a cyano group, the ring D is a trans-1,4-cyclohexylene group, m is 0, and Z4 is a single bond, X1 and X3 are not a fluorine atom at the same time
- and said composition having a nematic phase upper temperature limit of 75° C. or higher and a birefringence (Δn) of from 0.07 to 0.24.
A liquid crystal composition comprises as the first liquid crystal component a compound represented by the general formula (I):
- and as the second liquid crystal component at least one compound represented by the following general formula (III-a) in an amount of from 5 to 40% by weight:
- wherein R7 represents a C1-8 alkyl group or a C2-8 alkenyl group;
- the ring G represents a 1,4-phenylene group or a trans-1,4-cyclohexylene group;
- X5 represents a cyano group, a fluorine atom, a trifluoromethoxy group or a difluoromethoxy group;
- and X4 and X6 each independently represents a hydrogen atom or a fluorine atom
- and at least one compound selected from the group consisting of compounds represented by the following general formulae (II-b) and (II-c) in an amount of from 5 to 60% by weight:
- wherein R8 and R9 each independently representss a C1-8 alkyl group or a C2-8 alkenyl group:
- wherein R10 and R11 each independently representss a C1-8 alkyl group or a C2-8 alkenyl group.
Dependencies are inferred from the claim text.