| abstract |
There is provided a pigment dispersion including water, an aqueous polymer and a pigment as essential components,n wherein the aqueous polymer is a carboxyl group-containing polyurethane which is formed by reacting a diol compound, a diisocyanate compound and a reaction product, which is mainly composed of a compound represented by general formula (1) and prepared by reacting a diol compound having one or two carboxyl groups within each molecule with a diisocyanate compound and which also has a reaction index as calculated by (Formula 1) within a range from 0.95 to 1.10. nn Reaction index=(reaction rate of isocyanate group)×[(number of moles of diisocyanate compound( B ))/(number of moles of diol compound( A ))] (Formula 1) |