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US 5,980,622 AGranted
Magenta dyes for ink-jet inks
AssigneeHewlett-Packard Company
InventorGary W. Byers
Life of this patent
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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.
Claims16
An aqueous ink for ink-jet printing, comprising:
- a 4-hydroxy-3-(2'-pyridylazo)-1-(sulfo substituted) naphthalene magenta dye ligand, said dye ligand coordinating a polyvalent metal ion thus forming a metal complex;
- and
- aqueous ink vehicle.
Dependencies are inferred from the claim text.