Patent ID: 7670504

Claim:
A nematic liquid crystal composition having a negative dielectric anisotropy, comprising: one, or two or more compounds represented by the general formula (I): wherein R 1 represents an alkenyl group having 2 to 10 carbon atoms, and one CH 2 group or two or more unadjacent CH 2 groups existing in the groups may be substituted with O and/or S, and one, or two or more hydrogen atoms existing in these groups may be substituted with F or Cl; and R 2 represents an alkyl group having 1 to 10 carbon atoms or an alkoxyl group having 1 to 10 carbon atoms; and m represents 0, 1, or 2) as a first component, the content of which is from 10 to 80% by weight; and one, or two or more compounds represented by the general formula (II): [Chemical Formula 2] R 3 —B 1 —Y 1 —(B 2 —Y 2 ) p —R 4 (II) wherein R 3 and R 4 each independently represents an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, an alkoxyl group having 1 to 10 carbon atoms, or an alkenyloxy group having 3 to 10 carbon atoms; B 1 and B 2 each independently represents a group selected from the group consisting of: (a) a trans-1,4-cyclohexylene group (one CH 2 group or two unadjacent CH 2 groups existing in the group may be substituted with an oxygen atoms or a sulfur atom), (b) a 1,4-phenylene group (one, or two or more CH groups existing in the group may be substituted with a nitrogen atom), (c) a cyclohexan-1,4-diyl, a bicyclo[2.2.2]octan-1,4-dily group, a piperidin-1,4-diyl group, a naphthalen-2,6-diyl group, a decahydronaphthalen-2,6-diyl group, and a 1,2,3,4-tetrahydronaphthalen-2,6-diyl group, and the group (a), the group (b), or the group (c) may be substituted with CN or halogen; Y 1 and Y 2 each independently represents —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, and when a plurality of Y 2 or B 2 exist, they may be same or different; and P represents 0, 1, or 2 as a second component, the content of which is from 20 to 70% by weight.