Polymerizable compound, and liquid crystal composition and liquid crystal display device using the same

1. A compound represented by general formula (i):

wherein

R i1 represents a hydrogen atom, P-Sp-, a linear alkyl group having 1 to 30 carbon atoms, a branched alkyl group having 3 to 20 carbon atoms, a linear halogenated alkyl group having 1 to 30 carbon atoms, or a branched halogenated alkyl group having 3 to 20 carbon atoms, any —CH 2 — group in the alkyl group or the halogenated alkyl group being optionally replaced by —CH═CH—, —C≡C—, —O—, —NH—, —COO—, —OCO—, or —OCOO—, provided that no —O— groups are adjacent to each other;

ring A and ring C each independently represent a divalent aromatic group, a divalent cyclic aliphatic group, a divalent heterocyclic compound group, a divalent condensed ring, or a divalent condensed polycyclic ring, any hydrogen atom in theses ring structures being optionally replaced by L i1 , L i1 representing a halogen atom, a cyano group, a nitro group, P-Sp-, a monovalent organic group having a substituent represented by general formula K i1 , a linear alkyl group having 1 to 30 carbon atoms, or a linear halogenated alkyl group having 1 to 30 carbon atoms, any —CH 2 — group in the alkyl group or the halogenated alkyl group being optionally replaced by —CH═CH—, —C≡C—, —O—, —NH—, —COO—, —OCO—, or —OCOO—, provided that no —O— groups are adjacent to each other;

ring B represents a phenylene group or a naphthylene group, ring B having at least two P-Sp- groups;

Z i1 and Z i2 each independently represent a single bond, —O—, —CH═CH—, —CF═CF—, —C≡C—, —COO—, —OCO—, —OCOO—, —OOCO—, —CF 2 O—, —OCF 2 —, —CH═CHCOO—, —OCOCH═CH—, —CH═C(CH 3 )COO—, —OCOC(CH 3 )═CH—, —CH 2 —CH(CH 3 )COO—, —OCOCH(CH 3 )—CH 2 —, —OCH 2 CH 2 O—, or an alkylene group having 1 to 10 carbon atoms, one —CH 2 — group or two or more non-adjacent —CH 2 — groups in the alkylene group being optionally replaced by —O—, —COO— or —OCO—;

Z i3 represents a single bond, —O—, —CH═CH—, —COO—, —OCO—, —OCOO—, —OOCO—, —CH═CHCOO—, —OCOCH═CH—, —CH═C(CH 3 )COO—, —OCOC(CH 3 )═CH—, —CH 2 —CH(CH 3 )COO—, —OCOCH(CH 3 )—CH 2 —, or a linear alkylene group having 1 to 20 carbon atoms, one —CH 2 — group or two or more non-adjacent —CH 2 — groups in the alkylene group being optionally replaced by —O—, —COO—, or —OCO—; and

K i1 represents a group represented by any of general formulas (K-1) to (K-17):

wherein X K1 and Y K1 each independently represent —CH 2 —, an oxygen atom, or a sulfur atom; Z K1 represents an oxygen atom or a sulfur atom; W K1 , U K1 , V K1 , and S K1 each independently represent a methine group or a nitrogen atom; R K1 represents a hydrogen atom or a linear alkyl group having 1 to 6 carbon atoms; and T K1 each independently represent a group represented by any of general formulas (T-1) to (T-6):

wherein S T1 represents a single bond, a linear alkylene group having 1 to 15 carbon atoms, or a linear alkenylene group having 2 to 18 carbon atoms, any —CH 2 — group in the alkylene group or the alkelene group being optionally replaced by —O—, —COO—, —C(═O)—, —C(═CH 2 )—, or —OCO—, provided that no oxygen atoms are directly adjacent to each other; R T1 represents an alkyl group having 1 to 5 carbon atoms, any —CH 2 — group in the alkyl group being optionally replaced by —O—, —COO—, —C(═O)—, —C(═CH 2 )—, or —OCO—, provided that no oxygen atoms are directly adjacent to each other; and R T2 and R T3 each independently represent a hydrogen atom or an alkyl group having 1 to 5 carbon atoms, and

wherein a plurality of P each represent a polymerizable group; a plurality of Sp each represent a spacer group or a single bond; m represents an integer of 1 to 4; n represents 0 or 1; P are each independently the same or different; S are each independently the same or different; when a plurality of A, C, Z 1 , Z 2 , and K i1 are present, they are each independently the same or different; and, when K i1 represents any of general formulas (K-15), (K-16), and (K-17) and each T k1 represents any of (T-1), (T-4), and (T-5), at least one Sp represents a single bond.

2. The compound according to claim 1 , wherein A and C in general formula (i) each represent a ring structure selected from a 1,4-phenylene group, a 1,4-cyclohexylene group, an anthracene-2,6-diyl group, a phenanthrene-2,7-diyl group, a pyridine-2,5-diyl group, a pyrimidine-2,5-diyl group, a naphthalene-2,6-diyl group, an indan-2,5-diyl group, a 1,2,3,4-tetrahydronaphthalene-2,6-diyl group, and a 1,3-dioxane-2,5-diyl group, the ring structure being unsubstituted or representing a group optionally substituted with an alkyl group having 1 to 12 carbon atoms, a halogenated alkyl group having 1 to 12 carbon atoms, an alkoxy group having 1 to 12 carbon atoms, a halogenated alkoxy group having 1 to 12 carbon atoms, a halogen atom, a cyano group, a nitro group, or P-Sp-.

3. The compound according to claim 1 , wherein each P in general formula (i) represents a substituent selected from the group consisting of substituents represented by general formula (P-1) to general formula (P-14) below:

4. The compound according to claim 1 , wherein K i1 in general formula (i) represents general formula (K-1), (K-3), (K-11), or (K-13).

5. A liquid crystal composition comprising: the compound according to claim 1 , the compound being represented by general formula (i); a polymerizable compound different from the compound represented by general formula (i); and a non-polymerizable liquid crystal compound.

6. The liquid crystal composition according to claim 5 , wherein the liquid crystal composition contains, as the polymerizable compound, one or two or more compounds represented by general formula (P):

wherein

Z p1 represents a fluorine atom, a cyano group, a hydrogen atom, an alkyl group which has 1 to 15 carbon atoms and in which any hydrogen atom is optionally replaced by a halogen atom, an alkoxy group which has 1 to 15 carbon atoms and in which any hydrogen atom is optionally replaced by a halogen atom, an alkenyl group which has 1 to 15 carbon atoms and in which any hydrogen atom is optionally replaced by a halogen atom, an alkenyloxy group which has 1 to 15 carbon atoms and in which any hydrogen atom is optionally replaced by a halogen atom, or -Sp p2 -R p2 ;

R p1 and R p2 each independently represent any of the following formula (R-I) to formula (R-VIII):

wherein

* represents a bond to Sp p1 ;

R 2 to R 6 each independently represent a hydrogen atom, an alkyl group having 1 to 5 carbon atoms, or a halogenated alkyl group having 1 to 5 carbon atoms;

W represents a single bond, —O—, or a methylene group;

T represents a single bond or —COO—; and

p, t, and q each independently represent 0, 1, or 2);

Sp p1 and Sp p2 each represent a spacer group;

L p1 and L p2 each independently represent a single bond, —O—, —S—, —CH 2 —, —OCH 2 —, —CH 2 O—, —CO—, —C 2 H 4 —, —COO—, —OCO—, —OCOOCH 2 —, —CH 2 OCOO—, —OCH 2 CH 2 O—, —CO—NR a —, —NR a —CO—, —SCH 2 —CH 2 S—, —CH═CR a —COO—, —CH═CR a —OCO—, —COO—CR a ═CH—, —OCO—CR a ═CH—, —COO—CR a ═CH—COO—, —COO—CR a ═CH—OCO—, —OCO—CR a ═CH—COO—, —OCO—CR a ═CH—OCO—, —(CH 2 ) z —C(═O)—O—, —(CH 2 ) z —O—(C═O)—, —O—(C═O)—(CH 2 ) z —, —(C═O)—O—(CH 2 ) z —, —CH 2 (CH 3 )C—C(═O)—O—, —CH 2 (CH 3 )C—O—(C═O)—, —O—(C═O)—C(CH 3 )—CH 2 , —(C═O)—O—C(CH 3 )—CH 2 , —CH═CH—, —CF═CF—, —CF═CH—, —CH═CF—, —CF 2 —, —CF 2 O—, —OCF 2 —, —CF 2 CH 2 —, —CH 2 CF 2 —, —CF 2 CF 2 —, or —C≡C—, wherein R a each independently represent a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, and z represents an integer of 1 to 4;

M p2 represents a 1,4-phenylene group, a 1,4-cyclohexylene group, an anthracene-2,6-diyl group, a phenanthrene-2,7-diyl group, a pyridine-2,5-diyl group, a pyrimidine-2,5-diyl group, a naphthalene-2,6-diyl group, an indan-2,5-diyl group, a 1,2,3,4-tetrahydronaphthalene-2,6-diyl group, a 1,3-dioxane-2,5-diyl group, or a single bond, M p2 being unsubstituted or optionally substituted with an alkyl group having 1 to 12 carbon atoms, a halogenated alkyl group having 1 to 12 carbon atoms, an alkoxy group having 1 to 12 carbon atoms, a halogenated alkoxy group having 1 to 12 carbon atoms, a halogen atom, a cyano group, a nitro group, or —R p1 ;

M p1 represents any of the following formulas (i-11) to (ix-11):

wherein * represents a bond to Sp p1 , and ** represents a bond to L p1 , L p2 , or Z p1 ;

M p3 represents any of the following formulas (i-13) to (ix-13):

wherein * represents a bond to Z p1 , and ** represents a bond to L p2 ;

m p2 to m p4 each independently represent 0, 1, 2, or 3;

m p1 and m p5 each independently represent 1, 2, or 3;

when a plurality of Z p1 are present, they are each independently the same or different; when a plurality of R p1 are present, they are each independently the same or different; when a plurality of R p2 are present, they are each independently the same or different; when a plurality of Sp p1 are present, they are each independently the same or different; when a plurality of Sp p2 are present, they are each independently the same or different; when a plurality of L p1 are present, they are each independently the same or different; and when a plurality of M p2 are present, they are each independently the same or different.

7. A liquid crystal display device comprising two substrates each using the liquid crystal composition according to claim 5 , wherein at least one of the two substrates includes no alignment film.