Magenta dyes for ink-jet inks
US5980622A · kind A · utility
44Cited by
9References
16Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 29, 1997 |
| Grant date | Nov 9, 1999 |
| Priority date | — |
| Expiry date | Aug 29, 2017 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09B45/34
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A class of magenta dye chromophores generally described as metal complexes with dye ligands of 4-hydroxy-3-(2'-pyridylazo)-1-(sulfo substituted) naphthalene for use in ink-jet inks is disclosed. The dye ligands are coordinated to a polyvalent metal. The dye-metal complexes of the present invention provide excellent ink-jet prints having excellent lightfastness when exposed to direct sun light as well as office light.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.