Ink composition, inkjet recording method, and colored material
AssigneeNippon Kayaku Kabushiki Kaisha
InventorsAkira Kawaguchi, Takahiko Matsui, Takashi Yoshimoto, Kenji Ooshima
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Abstract
An aqueous black ink composition which enables the formation of an excellent black recorded image having extremely high ozone gas resistance and a neutral and achromatic color. The ink composition comprises: a dye which includes at least one compound represented by specific formula (1) or at least one tautomer or salt of the compound; a dye which includes at least one compound represented by specific formula (3) or at least one tautomer or salt of the compound; and a dye which includes at least one compound represented by specific formula (4) or at least one tautomer or salt of the compound.
Claims11
An ink composition comprising at least one kind of a compound represented by the following formula (1) or a tautomer thereof or a salt thereof as a coloring matter (1):
- wherein,
- R1 and R2 each independently represent a hydrogen atom;
- a halogen atom;
- a cyano group;
- a carboxy group;
- a sulfo group;
- a sulfamoyl group;
- an N-alkylaminosulfonyl group;
- an N,N-dialkylaminosulfonyl group;
- an N-phenylaminosulfonyl group;
- a phospho group;
- a nitro group;
- an acyl group;
- a ureido group;
- a C1-C4 alkyl group;
- a C1-C4 alkyl group substituted with a hydroxy group or a C1-C4 alkoxy group;
- a C1-C4 alkoxy group;
- a C1-C4 alkoxy group substituted with at least one kind of a group selected from the group consisting of a hydroxy group, a C1-C4 alkoxy group, a sulfo group, and a carboxy group;
- or an acylamino group;
- R3 and R4 each independently represent a hydrogen atom;
- a halogen atom;
- a cyano group;
- a carboxy group;
- a sulfo group;
- a nitro group;
- a C1-C4 alkyl group;
- a C1-C4 alkoxy group;
- or a C1-C4 alkoxy group substituted with at least one kind of a group selected from the group consisting of a hydroxy group, a C1-C4 alkoxy group, a sulfo group, and a carboxy group;
- n is 0 or 1;
- and
- the group A is a group represented by the following formula (2):
- wherein,
- R5 represents a cyano group;
- a carboxy group;
- a C1-C4 alkyl group;
- a C1-C4 alkoxycarbonyl group;
- or a phenyl group;
- and
- R6, R7 and R8 each independently represent a hydrogen atom;
- a halogen atom;
- a cyano group;
- a carboxy group;
- a sulfo group;
- a nitro group;
- a C1-C4 alkyl group;
- a C1-C4 alkoxy group;
- a C1-C4 alkoxy group substituted with at least one kind of a group selected from the group consisting of a hydroxy group, a C1-C4 alkoxy group, and a sulfo group;
- or an acylamino group,
- at least one kind of a compound represented by the following formula (3) or a tautomer thereof or a salt thereof as a coloring matter (II):
- wherein,
- m is 0 or 1;
- R101 to R103 each independently represent a hydrogen atom;
- a sulfo group;
- or a C1-C4 alkoxy group;
- and
- the group D represents a phenyl group or a naphthyl group substituted with one to three sulfo groups,
- and
- at least one kind of a compound represented by the following formula (4) or a salt thereof as a coloring matter (III):
- wherein,
- R201 to R204 each independently represent a hydrogen atom;
- or a C1-C4 alkoxy group substituted with a sulfo group.
Dependencies are inferred from the claim text.