Liquid crystal materials containing pleochroic anthraquinone dyes
US4483594A · kind A · utility
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10Claims
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Key dates
| Filing date | Apr 13, 1983 |
| Grant date | Nov 20, 1984 |
| Priority date | — |
| Expiry date | Apr 13, 2003 |
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 one of X and Y is OH and the other is NHR wherein R is H or lower alkyl; each of R.sub.1 and R.sub.2 independently represents alkyl, aryl, aralkyl, alkoxy or --NR.sub.3 R.sub.4 wherein each of R.sub.3 and R.sub.4 is independently H or lower alkyl, provided that R.sub.2 is always adjacent to an OH group.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.