Nematic liquid crystal composition and liquid crystal display element using same

摘要

A liquid crystal composition in which deterioration of viscosity that is associated with an increase in Δn and an increase in Δ∈ is suppressed, and a liquid crystal display element having a markedly improved response speed by using the relevant liquid crystal composition. The liquid crystal composition has a large value of Δn and negative Δ∈, and have large absolute values thereof. Also, the liquid crystal composition has low η, has excellent liquid crystal properties, and exhibits a liquid crystal phase that is stable in a wide temperature range. Furthermore, since the liquid crystal composition is chemically stable to heat, light, water and the like, the liquid crystal composition is capable of low voltage driving, and is practically useful and highly reliable.

主权项

1. A liquid crystal composition comprising:
as a first component, one or more compounds selected from compounds represented by Formula (I): wherein R11 and R12 each independently represent an alkyl group having 1 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms, or an alkenyl group having 2 to 8 carbon atoms, while these groups are each independently unsubstituted or have at least one halogen group as a substituent, and one or more of —CH2— present in these groups may be each independently substituted by —O—, —S—, —CO—, —COO—, —OCO— or —OCO—O— such that oxygen atoms are not directly bonded to each other; A11 and A12 each independently represent a group selected from the group consisting of: (a) a trans-1,4-cyclohexylene group (wherein one —CH2— or non-adjacent two or more of —CH2—, which are present in this group, may be substituted by —O— and/or —S—, (b) a 1,4-phenylene group (wherein one —CH═ or non-adjacent two or more of —CH═ groups, which are present in this group, may be substituted by —N═), and (c) 1,4-bicyclo(2.2.2)octylene, piperidine-1,4-diyl, naphthalene-2,6-diyl, decahydronaphthalene-2,6-diyl, or 1,2,3,4-tetrahydronaphthalene-2,6-diyl, while the hydrogen atoms on the group (a), group (b) and group (c) may be each independently substituted by an alkyl group having 1 to 3 carbon atoms, an alkenyl group having 2 or 3 carbon atoms, an alkoxy group having 1 to 3 carbon atoms, an alkenyloxy group having 1 to 3 carbon atoms, CN or halogen; Z11 and Z12 each independently represent —COO—, —OCO—, —CH2O—, —OCH2—, —CF2O—, —OCF2—, —CH2CH2—, —CH═CH—, —C≡C—, —(CH2)4—, —CH═CH—CH2CH2—, —CH2CH2—CH═CH—, or a single bond; a11 and a12 each independently represent 0 or 1; and as a second component, one or more compounds selected from compounds represented by Formulas (II) and (III): wherein R21, R22, R31 and R32 each independently represent an alkyl group having 1 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms, or an alkenyl group having 2 to 8 carbon atoms, while these groups are each independently unsubstituted or have at least one halogen group as a substituent, and one or two or more of —CH2— present in these groups may be each independently substituted by —O—, —S—, —CO—, —COO—, —OCO— or —OCO—O— such that oxygen atoms are not directly bonded to each other; A21, A22, A23 each independently represent a group selected from the group consisting of: (a) a trans-1,4-cyclohexylene group (wherein one —CH2— or non-adjacent two or more of —CH2—, which are present in this group, may be substituted by —O— and/or —S—, (b) a 1,4-phenylene group (wherein one —CH═ or non-adjacent two or more of —CH═groups, which are present in this group, may be substituted by —N═), and (c) 1,4-bicyclo(2.2.2)octylene, piperidine-1,4-diyl, naphthalene-2,6-diyl, decahydronaphthalene-2,6-diyl, or 1,2,3,4-tetrahydronaphthalene-2,6-diyl, while the hydrogen atoms on the group (a), group (b) and group (c) may be each independently substituted by an alkyl group having 1 to 3 carbon atoms, an alkenyl group having 2 or 3 carbon atoms, an alkoxy group having 1 to 3 carbon atoms, an alkenyloxy group having 1 to 3 carbon atoms, CN or halogen; Z21, and Z23 each independently represent —COO—, —OCO—, —CH2O—, —OCH2—, —CF2O—, —OCF2—, —CH2CH2—, —CH═CH—, —C≡C—, —(CH2)4—, —CH═CH—CH2CH2—, —CH2CH2—CH═CH—, or a single bond; Z22 represents —COO—, —OCO—, —CH2O—, —OCH2—, —OCF2—, —CH2CH2—, —CH═CH—, —C≡C—, —(CH2)4—, —CH═CH—CH2CH2—, —CH2CH2—CH═CH—, or a single bond; A31, A32 and A33 each independently represent a group selected from the group consisting of: (a) a trans-1,4-cyclohexylene group (wherein one —CH2— or non-adjacent two or more of —CH2—, which are present in this group, may be substituted by —O— and/or —S—; (b) a 1,4-phenylene group (wherein one —CH═ or non-adjacent two or more of —CH═ groups, which are present in this group, may be substituted by —N═) and (c) 1,4-cyclohexenylene, 1,4-bicyclo(2.2.2)octylene, piperidine-1,4-diyl, naphthalene-2,6-diyl, decahydronaphthalene-2,6-diyl, or 1,2,3,4-tetrahydronaphthalene-2,6-diyl, while the hydrogen atoms on the group (a), group (b) and group (c) may be each independently substituted by an alkyl group having 1 to 3 carbon atoms, an alkenyl group having 2 or 3 carbon atoms, an alkoxy group having 1 to 3 carbon atoms, an alkenyloxy group having 1 to 3 carbon atoms, CN or halogen; Z31, Z32 and Z33 each independently represent —COO—, —OCO—, —CH2O—, —OCH2—, —CF2O—, —OCF2—, —CH2CH2—, —CH═CH—, —C≡C—, —(CH2)4—, —CH═CH—CH2CH2—, —CH2CH2—CH═CH—, or a single bond; and a21, a22, a31 and a32 each independently represent 0 or 1, the liquid crystal composition comprising at least one compound represented by Formula (II) in which Z22 represents —CH2O—, or at least one compound represented by Formula (III) in which Z32 represents —CH2O— or —CF2O—.