Aqueous pigment inkjet ink

An aqueous pigment dispersion comprising:

• a pigment;
• and
• at least one dispersing agent having the formula I:
• wherein
• R1 is selected from the group consisting of a hydrogen, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted alkynyl group, a substituted or unsubstituted aralkyl group, a substituted or unsubstituted alkaryl group, and a substituted or unsubstituted (hetero)aryl group;
• L represents a divalent linking group including 2 to 10 carbon atoms;
• R2, R3, and R4 are independently selected from the group consisting of a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted alkynyl group, a substituted or unsubstituted aralkyl group, a substituted or unsubstituted alkaryl group, and a substituted or unsubstituted (hetero)aryl group;
• any of R1, R2, R3, R4, and L may represent atoms necessary to form a five to eight membered ring;
• R5 represents a hydrocarbon group including at least 8 carbon atoms;
• and
• X− represents an anion to compensate for a positive charge of the ammonium group.