Liquid crystalline (E, E)-butadiene compounds and mixtures and devices containing such compounds
US6106908A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 19, 1999 |
| Grant date | Aug 22, 2000 |
| Priority date | — |
| Expiry date | Mar 19, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K2323/00
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Liquid crystalline compounds useful in super twisted nematic liquid crystal displays are described and have the formula: ##STR1## wherein n is 1-5; PA1 m is 0-5; PA1 p is 0, 1 or 2; PA1 q is 0, 1 or 2 PA1 p+q is less than or equal to 3; PA1 A.sub.1, A.sub.2, A.sub.3 are independently chosen from 1,4-disubstituted benzene 2,5-disubstituted pyrimidine, 1,5-disubstituted pyridine, 2,6-disubstituted naphthalene which may be laterally substituted with F, Cl, Br or CN, trans-1,4-disubstituted cyclohexane 2,5-disubstituted dioxane, 2,5-disubstituted thiophene, 2,5-disubstituted furan, 2,5-disubstituted thiodiazole PA1 Z.sub.1 may be COO, OOC, OCH.sub.2, O; PA1 Z.sub.2, Z.sub.3 are independently chosen from a direct bond, COO, OOC, C.sub.2 H.sub.4, CH.sub.2 O, OCH.sub.2, C.sub.4 H.sub.8, C.sub.3 H.sub.6 O, (E)--CH.dbd.CHC.sub.2 H.sub.4, (E)--CH.dbd.CHCH.sub.2 O, --C.tbd.C--; PA1 R.sub.1 is alkyl, and may contain up to 20 carbon atoms and may be branched or a straight chain; provided that at least one of, A.sub.1, A.sub.2, A.sub.3 is selected from 1,4-disubstituted cyclochexane.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.