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US 5,205,861 AGranted
Aqueous ink jet inks containing alkylene oxide condensates of certain nitrogen heterocyclic compounds as cosolvents
AssigneeE. I. Du Pont de Nemours and Company
InventorHoward Matrick
Life of this patent
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Abstract
An ink for ink jet printers which comprises an aqueous carrier medium, pigment dispersion or dye and a nitrogen heterocyclic diol cosolvent which retards or inhibits pluggage failure. The cosolvent has a solubility in water of at least 4.5 parts in 100 parts of water at 25.degree. C. The pigment dispersion consists of pigment particles and a polymeric dispersant, having a hydrophilic segment and a segment that links to the pigment. These inks exhibit excellent decap performance, are storage stable and give images having excellent print quality.
Claims35
An aqueous ink jet ink composition comprising:
- (a) an aqueous carrier medium,
- (b) a colorant selected from the group consisting of a pigment dispersion and a dye;
- and
- (c) a nitrogen heterocyclic diol having a solubility in water of at least 4.5 parts in 100 parts of water at 25.degree. C., and which is the reaction product of a heterocyclic compound which is monocyclic and comprises either a 5- or 6- membered ring which comprises 2 trivalent nitrogen atoms with one carbon atom spaced between them, and said carbon atom is a part of one carbonyl group;
- and an alkylene oxide selected from the group consisting of ethylene oxide, propylene oxide, and mixtures thereof.
2 more elements
Dependencies are inferred from the claim text.