Liquid crystal compositions with pleochroic anthraquinone dyes
US4405211A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 27, 1981 |
| Grant date | Sep 20, 1983 |
| Priority date | — |
| Expiry date | Jul 27, 2001 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K19/603
- 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 compound having a formula: ##STR1## wherein: R represents a group selected from optionally substituted alkyl and optionally substituted monocyclic aryl; PA1 Q represents a group selected from halo, OH, --NO.sub.2, alkyl, aryl and --NR.sub.1 R.sub.2, wherein each of R.sub.1 and R.sub.2 independently represents a group selected from H, alkyl and aryl; PA1 x represents an integer from 1 to 4; and PA1 y represents an integer from 0 to 4; PA1 x+y being in the inclusive range 2 to 4; provided that when x+y=2, x=1 and y=1.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.