Dichroic dye and liquid crystal composition
AssigneeDIC Corporation
InventorsKento Kawakita, Kenta Tojo, Ayaki Hosono
Life of this patent
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Abstract
Provided are a compound represented by the following general formula (1) and a liquid crystal composition containing the compound, and a liquid crystal display device or a light control device having the liquid crystal composition. The compound represented by general formula (1) has both a large dichroic ratio and high solubility in the host liquid crystal. In addition, it has excellent chemical stability at a level usable as a device. Therefore, by using the compound represented by general formula (1) as a component of a GH-type liquid crystal composition, it is possible to provide a liquid crystal display device or a light control device with high contrast.
Claims10
A compound represented by general formula (1)
- (wherein U is a group selected from groups represented by general formula (2) or (3)
- wherein R1, R2, R3, R4 and R5 each independently represent a fluorine atom, a cyano group, an alkyl group having 1 to 20 carbon atoms or an alkenyl group having 2 to 30 carbon atoms, one —CH2— or two or more nonadjacent —CH2—'s present in these groups are optionally substituted with —NR6—, —O—, —S—, —CO—, —CS—, —COO—, —OCO—, —CO—S—, —S—CO—, —SO—, —SO2—, —O—CO—O—, —CO—NH—, —NH—CO—, —CH═CH—, —CF═CF—, or —C≡C—, and a hydrogen atom present in these groups is optionally substituted with a fluorine atom,
- wherein R6 represents a hydrogen atom, an alkyl group having 1 to 20 carbon atoms, or an alkenyl group having 2 to 30 carbon atoms, one —CH2— or two or more nonadjacent —CH2—'s present in these groups are optionally substituted with —O—·—S—, —COO—, —OCO—, or —CO—, and a hydrogen atom present in these groups is optionally substituted with a fluorine atom,
- Ra, Rb and Rc each independently represent a hydrogen atom, an alkyl group having 1 to 20 carbon atoms, or an alkenyl group having 2 to 30 carbon atoms, one —CH2— or two or more nonadjacent —CH2—'s present in these groups are optionally substituted with —NR7—, —O—, —S—, —CO—, —CS—, —COO—, —OCO—, —CO—S—, —S—CO—, —SO—, —SO2—, —O—CO—O—, —CO—NH—, —NH—CO—, —CH═CH—, —CF═CF—, or —C≡C—, and a hydrogen atom present in these groups is optionally substituted with a fluorine atom,
- wherein R7 represents a hydrogen atom, an alkyl group having 1 to 20 carbon atoms, or an alkenyl group having 2 to 30 carbon atoms, one —CH2— or two or more nonadjacent —CH2—'s present in these groups are optionally substituted with —O—, —S—, —COO—, —OCO—, or —CO—, and a hydrogen atom present in these groups is optionally substituted with a fluorine atom,
- Xa, Xb, and Xc each independently represent —S— or —O—,
- A1, A2, A4, A5, Aa, and Ab each independently represent an optionally substituted hydrocarbon ring or heterocyclic ring having 3 to 16 carbon atoms,
- Z1, Z2, Z4, Z5, Za, Zb, and Zc each independently represent —CH2O—, —OCH2—, —CF2—, —OCF2—, —COO—, —OCO—, —CH2CH2—, —CF2CF2—, —CH═CH—, —CF═CF—, —N═CH—, —CH═N—, —N═N—, —C≡C—, or a single bond,
- i, j, a, b, c, and d each independently represent an integer of 0 to 4,
- pluralities of A1s, A2s, A4s, A5s, Aas, and Abs, if present, may be the same or different A1s, A2s, A4s, A5s, Aas, and Abs, pluralities of Z1s, Z2s, Z4, Z5, Zas, Zbs, and Zcs, if present, may be the same or different Z1s, Z2s, Z4s, Z5s, Zas, Zbs, and Zcs, and a plurality of R6s, if present, may be the same or different R6s).
Dependencies are inferred from the claim text.