Organic materials
US4464282A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 24, 1982 |
| Grant date | Aug 7, 1984 |
| Priority date | — |
| Expiry date | Aug 24, 2002 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09B1/585
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A material suitable for a guest-host liquid crystal device comprises a solution of a liquid crystal material and a pleochroic dye wherein the pleochroic dye comprises at least one anthraquinone compound free from water solubilizing and ionic substituents and having the formula: ##STR1## wherein P is OH or NH.sub.2 ; each group X.sup.A is independently selected from OH, NO.sub.2, SR and NZ.sub.1 Z.sub.2 provided that one group X.sup.A is SR and the other group X.sup.A is OH, NO.sub.2 or NZ.sub.1 Z.sub.2 is 1 or 2; each group Q.sub.1 is independently alkyl having from 1 to 20 carbon atoms; each group R is independently selected from alkyl having from 1 to 20 carbon atoms, aryl having up to 15 carbon atoms and cycloalkyl having from 4 to 8 carbon atoms.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.