Ink jet ink, ink jet recording method, ink cartridge, recording unit and ink jet recording apparatus
AssigneeCanon Kabushiki Kaisha
InventorsKuniaki Fujimoto, Jun Yoshizawa, Minako Kawabe, Daiji Okamura
Life of this patent
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Abstract
The present invention provides an ink jet ink having a magenta color which gives an image excellent in magenta color tone and also excellent in image fastness (lightfastness and gas resistance). The ink jet ink includes a first coloring material that is an anthrapyridone compound having a structure represented by general formula (I) and/or general formula (II) and a second coloring material that is an azo compound having a structure represented by general formula (III), wherein the mass ratio of the content of the first coloring material to the content of the second coloring material is from 2.5 or more to 10.0 or less.
Claims11
An ink jet ink comprising at least two coloring materials of a first coloring material and a second coloring material,
- wherein the first coloring material is (a) a compound represented by the following general formula (I):
- wherein R independently represents a hydrogen atom, an alkyl group, a hydroxyalkyl group, a cyclohexyl group, a monoalkylaminoalkyl group, or a dialkylaminoalkyl group;
- M independently represents a hydrogen atom, an alkali metal, ammonium, or organic ammonium;
- and X represents a linking groups;
- and/or (b) a compound represented by the following general formula (II):
- wherein R1 represents an hydrogen atom or an alkyl group;
- m represents an integer of 1 to 3;
- and M independently represents a hydrogen atom, an alkali metal, ammonium or organic ammonium, and
- wherein the second coloring material is a compound represented by the following general formula (III):
- wherein R2, R3, R4, and R5, each independently represent an alkyl group;
- and M independently represents a hydrogen atom, an alkali metal, ammonium, or organic ammonium, and
- wherein the mass ratio of the content (% by mass) of the first coloring material to the content (% by mass) of the second coloring material is from 2.5 or more to 10.0 or less.
Dependencies are inferred from the claim text.