| 摘要 |
PROBLEM TO BE SOLVED: To provide an ink for inkjet recording, which gives high image density and exhibits excellent storage stability and injection recovery property.SOLUTION: The ink comprises at least water, a water-soluble solvent, a pigment and a polymer having a phosphonic acid group. The polymer is a copolymer having a diphosphonic acid group, in which at least a part of the diphosphonic acid group is a tetraalkylammonium salt; and the polymer includes at least, for example, a 4-methacrylamide-1-hydroxybutan-1,1-diphosphonic acid ditetraethyl ammonium salt, and a monomer obtained by the reaction between, for example, a 2-naphthoic acid-2-hydroxyethyl ester and a 2-methacryloyloxyethyl isocyanate.SELECTED DRAWING: Figure 1 |
