Novel azo compounds, aqueous solution, the ink composition, inkjet recording ink, inkjet recording method, inkjet recording ink cartridge, and an ink jet recorded matter

摘要

PROBLEM TO BE SOLVED: To provide an aqueous solution, having a good color phase to be used as a black ink, good storage stability, in particular, suppressed in bronze lucidity and giving a stable ink.;SOLUTION: The aqueous solution contains (a) a preservative and (b) at least one of an azo compound as represented in general formula (1) or a salt thereof, wherein the amount of (b) content is 1-25 mass%. (In general formula (1), A represents a substituted phenyl group or a substituted or unsubstituted, nitrogen-containing five-membered heterocyclic group. G represents a nitrogen atom or -C(R₂)=. R₂ represents a hydrogen atom, a sulpho group, a carboxy group, a substituted or unsubstituted carbamoyl group or a cyano group. Y₂, Y₃ and Y₄ each independently represent a hydrogen atom or a monovalent substituted group. Y₂, Y₃ and Y₄ may link together and form a ring. Y₂, Y₃ and Y₄ do not all represent a hydrogen atom at the same time. M each independently represents a hydrogen element or a monovalent counter cation).;COPYRIGHT: (C)2012,JPO&INPIT