Patent ID: 7393403

Claim:
A process of preparing a self-dispersible coloring agent represented by formula (II) below 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 a presence of a Lewis acid catalyst: X-L-R 1 (I) (the coloring agent)-L-R 1 (II) 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.