Nematic liquid crystal composition and liquid crystal display device using the same
A composition contains one or more compounds represented by general formula (i) and one or more compounds represented by general formula (ii), where a content of the compounds represented by general formula (i) is 5% to 30% and a content of the compounds represented by general formula (ii) is 5% to 25%: (In the formulae, R i1 , R i2 , and R ii1 each independently represent an alkyl group having 1 to 8 carbon atoms where one —CH 2 — or two or more non-adjacent —CH 2 — in the alkyl group may each independently be substituted with —CH═CH—, —C≡C—, —O—, —CO—, —COO—, or —OCO—, X i1 to X i6 each independently represent a hydrogen atom or a fluorine atom, and X ii1 represents a hydrogen atom, a fluorine atom, or a chlorine atom.).
1. A composition comprising one or more compounds represented by general formula (i) and one or more compounds represented by general formula (ii), wherein a content of the compounds represented by general formula (i) is 5% to 30% and a content of the compounds represented by general formula (ii) is 5% to 25%, the composition further comprising a compound represented by formula (2.2), a compound represented by formula (1.3), one or more compounds represented by general formula (VIII-1) but not comprising a compound having a carbonyl group, and one or more compounds represented by general formula (XI)
(In the formulae (i) and (ii), R i1 , R i2 , and R ii1 each independently represent an alkyl group having 1 to 8 carbon atoms where one —CH 2 — or two or more non-adjacent —CH 2 — in the alkyl group may each independently be substituted with —CH═CH—, —C≡C—, or —O—, X i1 to X i6 each independently represent a hydrogen atom or a fluorine atom, and X ii1 represents a fluorine atom
in the formula (VIII-1), R 8 represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms, and wherein
in the formula (XI), X 111 to X 117 each independently represent a fluorine atom or a hydrogen atom, at least one of X 111 to X 117 represents a fluorine atom, R 11 represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms, and Y 11 represents a fluorine atom or —OCF 3 .).
2. position according to claim 1 , wherein one of X i1 to X i6 in general formula (i) represents a fluorine atom.
3. position according to claim 1 , comprising a compound represented by general formula (L):
(In the formula, R L1 and R L2 each independently represent an alkyl group having 1 to 8 carbon atoms where one —CH 2 — or two or more non-adjacent —CH 2 — in the alkyl group may each independently be substituted with —CH═CH—, —C≡C—, or —O—,
OL represents 0, 1, 2, or 3,
B L1 , B L2 , and B L3 each independently represent a group selected from the group consisting of
(a) a 1,4-cyclohexylene group (one —CH 2 — or two or more non-adjacent —CH 2 — that are present in this group may each be substituted with —O—) and
(b) a 1,4-phenylene group (one —CH═ or two or more non-adjacent —CH═ that are present in this group may each be substituted with —N═)
where the groups (a) and (b) may each independently be substituted with a cyano group, a fluorine atom, or a chlorine atom,
L L1 and L L2 each independently represent a single bond, —CH 2 CH 2 —, —(CH 2 ) 4 —, —OCH 2 —, —CH 2 O—, —OCF 2 —, —CF 2 O—, —CH═N—N═CH—, —CH═CH—, —CF═CF—, or —C≡C—, and
when OL represents 2 or 3 and two or more L L2 are present, the two or more L L2 may be the same or different and when OL represents 2 or 3 and two or more B L3 are present, the two or more B L3 may be the same or different provided that the compounds represented by general formula (i), formula (2.2), and formula (1.3) are excluded.).
4. position according to claim 1 , comprising a compound represented by general formula (M):
(In the formula, R M1 represents an alkyl group having 1 to 8 carbon atoms where one —CH 2 — or two or more non-adjacent —CH 2 — in the alkyl group may each independently be substituted with —CH═CH—, —C≡C—, or —O—,
PM represents 0, 1, 2, 3, or 4,
C M1 and C M2 each independently represent a group selected from the group consisting of
(d) a 1,4-cyclohexylene group (one —CH 2 — or two or more non-adjacent —CH 2 — that are present in this group may each be substituted with —O— or —S—) and
(e) a 1,4-phenylene group (one —CH═ or two or more non-adjacent —CH═ that are present in this group may each be substituted with —N═)
where the group (d) and the group (e) may each independently be substituted with a cyano group, a fluorine atom, or a chlorine atom,
K M1 and K M2 each independently represent a single bond, —CH 2 CH 2 —, —(CH 2 ) 4 —, —OCH 2 —, —CH 2 O—, —OCF 2 —, —CF 2 O—, or —C≡C—,
when PM represents 2, 3, or 4 and two or more K M1 are present, the two or more K M1 may be the same or different and when PM represents 2, 3, or 4 and two or more C M2 are present, the two or more C M2 may be the same or different,
X M1 and X M3 each independently represent a hydrogen atom, a chlorine atom, or a fluorine atom, and
X M2 represents a hydrogen atom, a fluorine atom, a chlorine atom, a cyano group, a trifluoromethyl group, a fluoromethoxy group, a difluoromethoxy group, a trifluoromethoxy group, or a 2,2,2-trifluoroethyl group, provided that the compounds represented by general formula (ii), formula (VIII-1), and formula (XI) are excluded.
5. A liquid crystal display device that uses the composition according to claim 1 .
6. An IPS element that uses the composition according to claim 1 .
7. The composition according to claim 1 , wherein the one or more compounds represented by general formula (XI) comprises