Pigment dispersion, inkjet ink composition using the pigment dispersion, method of manufacturing the inkjet ink composition and image forming method using the inkjet ink composition

摘要

A pigment dispersion including a pigment, a dispersant, and a dispersion medium including water, wherein the dispersant includes a compound having the following formula (1). wherein R1 represents an alkyl group having from 1 to 20 carbon atoms, a phenyl group, a substituted phenyl group or a naphthyl group; k is 0 or an integer of from 1 to 7; A1 and A2 independently represent an oxyethylene unit, an oxypropylene unit or a combination of an oxyethylene unit and an oxypropylene unit; and h and j are independently 0 or a positive integer, wherein the total number of h and j is from 31 to 100.