Inkjet ink, inkjet printing process and ink set for forming an image on a substrate and aqueous pigment dispersion for forming the inkjet ink

Pigment dispersion for forming an inkjet ink, the pigment dispersion comprising a pigment P, a first block copolymer dispersant D1 for dispersing the pigment P and a second block copolymer dispersant D2 for dispersing the pigment P, and an aqueous carrier;

• wherein said first block copolymer dispersant D1 is different from said second block copolymer dispersant D2, wherein each block copolymer dispersant D1, D2 comprises an anchoring segment A1, A2 for anchoring to the pigment P, wherein each of the block copolymer dispersant D1, D2 additionally comprises a matrix stabilization segment M for aqueous phase stabilization of the pigment P, wherein the anchoring segment A1 of the first block copolymer dispersant D1 comprises a repeating unit R1 and the anchoring segment A2 of the second block copolymer dispersant D2 comprises a repeating unit R2, wherein the repeating unit R1 is less hydrophobic than the repeating unit R2;
• wherein the aqueous carrier contains water, and optionally a total amount of water soluble organic solvent, which is less than 20 wt % of the total weight of the aqueous carrier, and
• wherein the repeating unit R1 has a Hansen Solubility Parameter value δ(polar+hydrogen)R1 (=√[δ(polar)2+δ(hydrogen)2]), wherein δ(polar+hydrogen)R1>7.2 cal1/2 cm−3/2.