Ink composition, inkjet recording method and colored body

摘要

An aqueous black ink composition that produces a black recorded image that is stable even when stored for a long time period, exhibits a neutral black to gray color with low color saturation and no tinge, has a high printed image density and exhibits excellent fastness properties of the recorded image, particularly ozone-gas resistance. The ink composition contain at least one kind of coloring matter (I), which a coloring matter represented by formula (1) below, a tautomer thereof, or a salt of the coloring matter or the tautomer; at least one kind of coloring matter (II), which is a coloring matter represented by formula (2) below or a salt thereof; and coloring matter (III), which is a coloring matter having an azo group other than coloring matters (I) and (II), or a salt thereof.;

主权项

1. An ink composition comprising at least one kind of coloring matter (I), which is a coloring matter represented by the following formula (1), a tautomer thereof, or a salt of the coloring matter or the tautomer; at least one kind of coloring matter (II), which is a coloring matter represented by the following formula (2), or a salt thereof; and a coloring matter (III), which is a coloring matter having an azo group other than coloring matters (I) and (II), or a salt thereof: wherein, R1 represents a (C1-C4) alkyl group; a (C1-C4) alkyl group substituted with a carboxy group; a phenyl group; a phenyl group substituted with a sulfo group; or a carboxy group, R2 represents a cyano group; a carbamoyl group; or a carboxy group, R3 and R4 each independently represent a hydrogen atom; a (C1-C4) alkyl group; a halogen atom; a (C1-C4) alkoxy group; or a sulfo group, R5 represents a (C1-C4) alkylthio group; or a (C1-C4) alkylthio group substituted with at least one kind of group selected from the group consisting of a hydroxy group, a sulfo group, and a carboxy group, R6 represents a (C1-C4) alkylcarbonylamino group, R7 represents a (C1-C4) alkylthio group; or a (C1-C4) alkylthio group substituted with at least one kind of group selected from the group consisting of a hydroxy group, a sulfo group, and a carboxy group, R8 represents a (C1-C4) alkylcarbonylamino group, R9 and R10 each independently represent a hydrogen atom; a carboxy group; a sulfo group; an acetylamino group; a chlorine atom; a (C1-C4) alkyl group; a (C1-C4) alkoxy group; or a (C1-C4) alkoxy group substituted with at least one kind of group selected from the group consisting of a hydroxy group, a (C1-C4) alkoxy group, a sulfo group, and a carboxy group, and R11 to R13 each independently represent a hydrogen atom; a carboxy group; a sulfo group; a hydroxy group; an acetylamino group; a chlorine atom; a cyano group; a nitro group; a sulfamoyl group; a (C1-C4) alkyl group; a (C1-C4) alkoxy group; a (C1-C4) alkoxy group substituted with at least one kind of group selected from the group consisting of a hydroxy group, a (C1-C4) alkoxy group, a sulfo group and a carboxy group; a (C1-C4) alkylsulfonyl group; or a (C1-C4) alkylsulfonyl group substituted with at least one kind of group selected from the group consisting of a hydroxy group, a sulfo group, and a carboxy group, wherein, Ra represents a hydrogen atom; a hydroxy group; a carboxy group; an unsubstituted (C1-C4) alkyl group; a (C1-C4) alkyl group substituted with a hydroxy group or a (C1-C4) alkoxy group; an unsubstituted (C1-C4) alkoxy group; a (C1-C4) alkoxy group substituted with a hydroxy group or a (C1-C4) alkoxy group; an unsubstituted (C1-C4) alkylamino group; a (C1-C4) alkylamino group substituted with a hydroxy group or a (C1-C4) alkoxy group; a carboxy-(C1-C5) alkylamino group; a bis(carboxy-(C1-C5) alkyl)amino group; an unsubstituted (C1-C4) alkanoylamino group; a (C1-C4) alkanoylamino group substituted with a hydroxy group or a (C1-C4) alkoxy group; an unsubstituted phenylamino group; a phenylamino group having the benzene ring substituted with at least one kind of group selected from the group consisting of a carboxy group, a sulfo group, and an amino group; a sulfo group; a halogen atom; or a ureido group, and X represents an aliphatic amino group substituted with a carboxy group or a sulfo group.