Liquid-crystal alkenyltolan derivative, liquid-crystal composition, and liquid-crystal display element
US6333080A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 6, 1999 |
| Grant date | Dec 25, 2001 |
| Priority date | — |
| Expiry date | May 6, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K2323/00
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A liquid crystalline alkenyltolan derivative expressed by the general formula EQU C.sub.t H.sub.2t-1 --G--(CH.sub.2).sub.m --A.sub.1 --B.sub.1 --(A.sub.2 --B.sub.2).sub.n --(A.sub.3 --B.sub.3).sub.p --A.sub.4 --X wherein A.sub.1, A.sub.2, A.sub.3, and A.sub.4 independently represent a 1,4-cyclohexylene, 1,4-phenylene in which one or two hydrogen atoms may be replaced by a fluorine atom(s), dioxane-2,5-diyl, or pyrimidine-2,5-diyl group; B.sub.1, B.sub.2, and B.sub.3 independently represent a covalent bond, an 1,2-ethylene, 1,2-ethenylene, 1,2-ethynylene, oxymethylene, methylenoxy, carbonyloxy, or 1,4-butylene group provided that at least one of B.sub.1, B.sub.2, and B.sub.3 represents an 1,2-ethynylene group; G represents a covalent bond or an oxygen atom; C.sub.t H.sub.2t-1 represents an alkenyl group having t carbon atoms; n and p are each 0 or 1; and X represents an alkyl group having 1 to 10 carbon atoms. The derivative provides a liquid-crystal compound and a liquid-crystal composition which have high anisotropy, high elastic constant ratio, excellent comparability with other liquid-crystal compounds, and low viscosity and are chemically and physically stable.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.