Ink composition and inkjet recording method
AssigneeFUJIFILM Corporation
InventorsTakashi Ozawa, Keiichi Tateishi, Toru Harada
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Abstract
A novel ink composition, which has an absorption characteristic excellent in color reproducibility as a yellow color of one of the three primary colors, which has enough fastness against light, heat and humidity, and which does not cause bronze phenomenon, is provided. The ink composition contains water, a yellow dye having an oxidation potential nobler than 1.0 V, and an aromatic compound, aliphatic compound and/or a salt thereof having at least one of carboxyl group, sulfo group and phosphoric acid group.
Claims13
An ink composition comprising:
- water;
- a yellow dye having an oxidation potential nobler than 1.0 V;
- and at least one compound of an aromatic compound and a salt thereof, the at least one compound having at least one of a carboxyl group, a sulfo group and a phosphoric acid group and wherein the yellow dye is a compound represented by formula (1):
- wherein R1 and R2 each independently represents a monovalent group, Z represents a nitrogen atom, an oxygen atom, a sulfur atom or a carbon atom to which a monovalent group is bound, and M represents a hydrogen atom or a cation, provided that two azo groups exist in the molecule;
- and
- wherein the at least one compound is at least one of pyridine-2-carboxylic acid, pyridine-3-carboxylic acid, pyridine-4-carboxylic acid and a salt thereof.
A method for avoiding bronze phenomenon in inkjet recording, comprising the steps of utilizing an ink composition containing a yellow dye, wherein the composition further comprises an aromatic compound, or an aliphatic compound and/or a salt thereof, wherein the aromatic compound or aliphatic compound comprises a carboxyl group, a sulfo group or a phosphoric acid group.
Dependencies are inferred from the claim text.