Class of dichroic dyes for use with liquid crystals
US4401369A · kind A · utility
26Cited by
11References
19Claims
0Family size
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Key dates
| Filing date | Oct 19, 1981 |
| Grant date | Aug 30, 1983 |
| Priority date | — |
| Expiry date | Oct 19, 2001 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K19/601
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A cholesteric guest-host liquid crystal composition having a positive dielectric anisotropy and consisting of a positive nematic host component, an optically active cholesteric component, and a tetra-azo dichroic dye guest component having a dichroic ratio of at least 0.72. The tetra-azo dye is selected from the group consisting of ##STR1##
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.