Liquid crystal alkenyl bicyclo[2.2.2]octanes and mixtures and devices containing such compounds
US6187393A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 19, 1999 |
| Grant date | Feb 13, 2001 |
| Priority date | — |
| Expiry date | Mar 19, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K2323/00
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Compounds of formula (I) ##STR1## are provided which are particularly useful in super twisted nematic devices, where n may be 0-5; m may be 0-5; p may be 1-9; q may be 1, 1, or 2; A.sub.1, A.sub.2 are independently chosen from 1-4, -disubstituted benzene, 2,5-disubstituted pyrimidine, or 2,5-disubstituted pyridine, trans- 1,4-disubstituted cyclohexane, trans- 2,5-disubstitued dioxane. The aromatic rings may be laterally substituted with F, Cl, Br or CN; Z.sub.1 may be O, COO, OOC; Z.sub.2, Z.sub.3 are independent chosen from a direct bond, COO, OOC, C.sub.2 H.sub.4, CH.sub.2 O, OCH.sub.2, or -c.tbd.c-, provided that when Z.sub.1 is O and m is 1, 3 or 5 the carbon--carbon double bond configuration is E; provided that when Z.sub.1 is O and m is 2 or 4 the carbon--carbon double bond configuration is Z; provided that when Z.sub.1 is COO or OOC and m is 0, 2 or 4 the carbon--carbon double bond configuration is E; and provided that when Z.sub.1 is COO or OOC and m is 1, 3 or 5 the carbon--carbon double bond configuration is Z.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.