Aqueous pigment dispersion for preparing aqueous ink-jet ink for plastic substrate, aqueous ink-jet ink, and printed matter

An aqueous pigment dispersion for preparing an aqueous ink-jet ink for a plastic substrate, comprising a binder, a pigment, and an aqueous medium, wherein

• the binder contains a urethane resin (A) that is a reaction product of a polyol (a1) including a polyol (a1-1) having an acid group and a polyol (a1-2) other than the polyol (a1-1) and a polyisocyanate (a2) including a polyisocyanate (a2-1) having an alicyclic structure and contains an aqueous medium (B);
• the acid group possessed by the urethane resin (A) is neutralized;
• the urethane resin (A) includes the alicyclic structure within a range of 500 to 5,000 mmol/kg based on the whole urethane resin (A);
• and
• the pigment is dispersed in the aqueous pigment dispersion at a volume-average particle diameter of 50 to 400 nm,
• provided that when the polyol (a1) does not include a polycarbonate polyol, a rate of the alicyclic structure possessed by the urethane resin (A) is 1,000 to 5,000 mmol/kg based on the whole urethane resin (A), and the acid group possessed by the urethane resin (A) is neutralized by a metal salt;
• and
• when the polyol (a1) includes a polycarbonate polyol, the urethane resin (A) is not chain-extended or is polyamine-extended.