Polymerizable liquid crystal compound having fused ring and homo- and copolymer of the polymerizable liquid crystal compound
A polymerizable liquid crystal compound of formula (1). The compound has high optical (refractive index) anisotropy (Δn), exhibits a liquid crystal phase at room temperature (having a broad liquid crystal phase temperature range) without crystallization, has high solubility in cyclohexanone, methyl ethyl ketone or like organic solvents, exhibits excellent coating properties and orientation properties, and, after polymerization, has high transparency. wherein R 1 and R 2 each represent hydrogen, a methyl group or halogen; rings A to C each represent a benzene ring, a naphthalene ring, etc.; at least one of rings A to C is a fused ring; X, Y, and Z each represent a C1 to C6 alkyl group, etc.; L 1 , L 2 , and L 3 each represent —COO—, —OCO—, —O(CH 2 ) j — (j=1 to 8), etc.; n is 0 or 1, and a to c are numbers such that the polymerizable liquid crystal compound may have at least one of X, Y, and Z.
1. A polymerizable liquid crystal compound represented by general formula (1):
wherein R 1 and R 2 each independently represent a hydrogen atom, a methyl group or a halogen atom; rings A, B, and C each independently represent a benzene ring, a cyclohexane ring, a cyclohexene ring, a naphthalene ring, a tetrahydronaphthalene ring, a decahydronaphthalene ring, an anthracene ring or a phenanthrene ring, the —CH═ moiety of some of which rings may be substituted with —N═, and the —CH 2 — moiety of some of which rings may be substituted with —S— or —O—; at least one of the rings A, B, and C is a fused ring; X, Y, and Z each independently represent a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, a substituted or unsubstituted alkoxy group having 1 to 6 carbon atoms, a substituted or unsubstituted alkenyl group having 2 to 6 carbon atoms, a halogen atom, a cyano group, or a group represented by general formula (2):
(wherein R 3 represents a hydrogen atom, a methyl group or a halogen atom); L 1 , L 2 , and L 3 each independently represent a single bond, —COO—, —OCO—, —(CH 2 ) h —, —CH═CH—, —(CH 2 ) i O—, —O(CH 2 ) j —, —O(CH 2 ) k O—, —OCOO(CH 2 ) l —, —(CH 2 ) m OCOO—, —(OCH 2 CH 2 ) o —, —(CH 2 CH 2 O) p —, (OCH 2 CH(CH 3 )) q —, —(CH(CH 3 )CH 2 ) r —, —(CH 2 ) s O(CH 2 ) t —, —O(CH 2 ) u —[Si(CH 3 ) 2 O] v —Si(CH 3 ) 2 (CH 2 ) w —, —CH═CHCH 2 O—, —OCH 2 CH═CH—, —CH═CH—COO—, —OCO—CH═CH—, —C≡C—, —(CH 2 ) 2 COO—, —OCO(CH 2 ) 2 —, —CF═CF—, —OCF 2 —, —CF 2 O—, —C≡C—COO—, —OCO—C≡C—, or —O—; part of the carbon atoms of L 1 , L 2 , and L 3 may be replaced with a silicon atom(s); n represents 0 or 1; h, i, j, k, l, m, and n each independently represent an integer of 1 to 8; o, p, q, r, s, t, u, v, and w each independently represent an integer of 1 to 3; a, b, and c represent the numbers of the substituents on the rings A, B, and C, respectively, being an integer of (2d+2) or smaller, where d is the number of the 6-membered rings contained in the monocyclic or fused rings A, B, and C, respectively; when n=0, at least one of a and b is 1 or greater; and when n=1, at least one of a, b, and c is 1 or greater.
2. The polymerizable liquid crystal compound of claim 1 , which is represented by general formula (3):
wherein R 1 , R 2 , ring A, ring B, ring C, X, Y, Z, a, b, c, and j are as defined above; and at least one of the rings A, B, and C is a fused ring.
3. The polymerizable liquid crystal compound of claim 1 , wherein at least two of the rings A, B, and C are fused rings.
4. A homopolymer obtained by polymerizing the polymerizable liquid crystal compound of claim 1 .
5. A copolymer obtained by copolymerizing the polymerizable liquid crystal compound of claim 1 and another ethylenically unsaturated compound.
6. A copolymer obtained by copolymerizing the polymerizable liquid crystal compound of claim 1 and a comonomer having an optically active group.
7. An optically anisotropic material comprising at least one member selected from the group consisting of a homopolymer obtained by polymerizing the polymerizable liquid crystal compound of claim 1 , a copolymer obtained by copolymerizing the polymerizable liquid crystal compound and another ethylenically unsaturated compound, and a copolymer obtained by copolymerizing the polymerizable liquid compound and a comonomer having an optically active group.
8. The polymerizable liquid crystal compound of claim 2 , wherein at least two of the rings A, B, and C are fused rings.
9. A homopolymer obtained by polymerizing the polymerizable liquid crystal compound of claim 2 .
10. A homopolymer obtained by polymerizing the polymerizable liquid crystal compound of claim 3 .
11. A copolymer obtained by copolymerizing the polymerizable liquid crystal compound of claim 2 and another ethylenically unsaturated compound.
12. A copolymer obtained by copolymerizing the polymerizable liquid crystal compound of claim 3 and another ethylenically unsaturated compound.
13. A copolymer obtained by copolymerizing the polymerizable liquid crystal compound of claim 2 and a comonomer having an optically active group.
14. A copolymer obtained by copolymerizing the polymerizable liquid crystal compound of claim 3 and a comonomer having an optically active group.
15. The polymerizable liquid crystal compound of claim 1 , wherein the polymerizable liquid crystal compound is represented by one of compounds 1-22:
16. A polymerizable liquid crystal compound represented by general formula (1):
wherein the compound of general formula (1) is one of compounds 1-22: