PIGMENT DISPERSION AND AQUEOUS INK FOR INKJET RECORDING

摘要

There is provided a pigment dispersion including water, an aqueous polymer and a pigment as essential components,
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. Reaction index = reaction rate of isocyanate group × number of moles diisocyanate compound B / number of moles of diol compound A