Ink for use in ink jet recording and ink jet recording method utilizing the same

摘要

An ink for use in ink jet recording which contains a dye and a pigment as colorants. The pigment is a self-dispersible pigment in which at least one anionic group is bonded directly or through another atomic group to a surface of the pigment, the dye is an anionic dye, 2-pyrrolidone is further contained in the ink as a solvent, and the mass-based content X of 2-pyrrolidone in the ink and the ratio Y of the pigment to the sum of the dye and the pigment satisfy the following formulas 1 to 3 at the same time: <?in-line-formulae description="In-line Formulae" end="lead"?>12<=X<30 formula 1<?in-line-formulae description="In-line Formulae" end="tail"?> <?in-line-formulae description="In-line Formulae" end="lead"?>50<=Y<=75 formula 2<?in-line-formulae description="In-line Formulae" end="tail"?> <?in-line-formulae description="In-line Formulae" end="lead"?>Y>=-2X+84 formula 3.<?in-line-formulae description="In-line Formulae" end="tail"?>