Liquid crystal compositions with pleochroic anthraquines dyes
US4496221A · kind A · utility
4Cited by
18References
37Claims
0Family size
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Inventors
Key dates
| Filing date | Feb 24, 1982 |
| Grant date | Jan 29, 1985 |
| Priority date | — |
| Expiry date | Feb 24, 2002 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09B1/58
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A material suitable for a guest-host liquid crystal device comprises a soion of a liquid crystal material and a pleochroic dye where in the pleochroic dye comprises at least one anthrquinone compound free from water solubilizing and ionic substituents and having the formula: ##STR1## wherein Q is NH.sub.2, OH, alkyl, aryl, NO.sub.2 or halo; PA0 n is 0 to 4; PA0 each X independently is H, --SR, --NZ.sub.1 Z.sub.2 or Q; PA0 each R independently is alkyl, aryl or cycloalkyl; PA0 Z.sub.1 and Z.sub.2 are independently H, alkyl, cycloalkyl or aryl; provided that there are at least two groups X which are different --SR groups.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.