摘要：

A self-dispersible coloring agent represented by formula (II) below is prepared by incorporating a hydrophilic group into a coloring agent through a reaction of a hydrophilic group-containing halide represented by formula (I) below and the coloring agent in the presence of a Lewis acid catalyst: ?in-line-formulae description="In-line Formulae" end="lead"? X-L-R 1 (I) ?in-line-formulae description="In-line Formulae" end="tail"? ?in-line-formulae description="In-line Formulae" end="lead"? (the coloring agent)-L-R 1 (II) ?in-line-formulae description="In-line Formulae" end="tail"? wherein L represents a single bond or —C(═O)—; R 1 is selected from the group consisting of a substituted or unsubstituted C 1 -C 20 alkyl group containing a hydrophilic group, a substituted or unsubstituted C 6 -C 20 aryl group containing a hydrophilic group a substituted or unsubstituted C 2 -C 20 heteroaryl group containing a hydrophilic group and a substituted or unsubstituted C 7 -C 20 arylalkyl group containing a hydrophilic group; and X is one of: —F, —Br, —I and —Cl. may be obtained conveniently through a one-step process. The ink composition containing the self-dispersible coloring agent provides effective long-term storage stability and dispersion stability using a one-step process.

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