Liquid crystal materials containing pleochroic anthraquinone dyes
US4506957A · kind A · utility
3Cited by
4References
36Claims
0Family size
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Key dates
| Filing date | Apr 6, 1983 |
| Grant date | Mar 26, 1985 |
| Priority date | — |
| Expiry date | Apr 6, 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 characterized in that the dye comprises at least one anthraquinone compound free from water-solubilizing and ionic substituents and having the formula: ##STR1## wherein each of R and R.sup.1 independently represents an n-alkyl group having from 4 to 7 carbon atoms inclusive and wherein each of R.sup.2 and R.sup.3 is independently selected from hydrogen and alkyl groups having from 1 to 4 carbon atoms inclusive.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.