Patent ID: 8003006

Claim:
A nematic liquid crystal composition, comprising: one or at least two compounds represented by general formula (I) as a first component: (wherein R 1 represents an alkyl group of 1 to 10 carbon atoms or an alkenyl group of 2 to 10 carbon atoms, in which one CH 2 group, or at least two CH 2 groups that are not adjacent, may be replaced by O and/or S, and one or at least two hydrogen atoms may be replaced by F or Cl; R 2 represents an alkyl group of 1 to 10 carbon atoms, an alkoxyl group of 1 to 10 carbon atoms, an alkenyl group of 2 to 10 carbon atoms, or an alkenyloxy group of 3 to 10 carbon atoms; and m represents 0, 1, or 2); and one or at least two compounds represented by general formula (II) as a second component: R 3 —B 1 —Y 1 —(B 2 —Y 2 ) p —R 4 (II) (wherein R 3 and R 4 each represent, independently, the same as R 2 in the general formula B 1 and B 2 each represent, independently, a group selected from the group consisting of (a) a trans-1,4-cyclohexylene group (in which one CH 2 group, or at least two CH 2 groups that are not adjacent, may be replaced by an oxygen atom or a sulfur atom), (b) a 1,4-phenylene group (in which one or at least two CH groups may be replaced by a nitrogen atom), and (c) a 1,4-cyclohexenylene group, a 1,4-bicyclo[2.2.2]octylene group, a piperidine-1,4-diyl group, a naphthalene-2,6-diyl group, a decahydronaphthalene-2,6-diyl group, and a 1,2,3,4-tetrahydronaphthalene-2,6-diyl group, in which a hydrogen atom of the above group (a), group (b), or group (c) may be replaced by halogen; Y 1 and Y 2 each represent, independently, —CH 2 CH 2 —, —CH═CH—, —CH(CH 3 )CH 2 —, —CH 2 CH(CH 3 )—, —CH(CH 3 )CH(CH 3 )—, —CF 2 CF 2 —, —CF═CF—, —CH 2 O—, —OCH 2 —, —OCH(CH 3 )—, —CH(CH 3 )O—, —(CH 2 ) 4 —, —(CH 2 ) 3 O—, —O(CH 2 ) 3 —, —C≡C—, —CF 2 O—, —OCF 2 —, —COO—, —OCO—, —COS—, —SCO—, or a single bond; in the case where pluralities of Y 2 and B 2 exist, a plurality of Y 2 or B 2 may be the same or different; and p represents 0, 1, or 2), wherein a dielectric anisotropy is negative.