Patent ID: 9018317
Filing Date: 2015-04-28
Classification: B82Y,C01P,C08G,C09C,C09D

Abstract:
1. A method for producing a pigment dispersion composition comprising bringing a pigment (I) having a surface acidic group and a basic compound (II) having two or more amino groups selected from a primary amino group and a secondary amino group in its molecule, into contact with each other in an aqueous medium to prepare a pigment having an unreacted surface amino group, bringing the pigment into contact with a polyisocyanate polyurethane resin (III) having two or more isocyanate end groups so that the pigment and the polyisocyanate polyurethane resin are bonded via a urea bond to prepare a dispersion of a polyurethane resin-bonded pigment (A), and heating the dispersion of the polyurethane resin-bonded pigment (A) at 40 to 100° C. for 1 to 30 days, wherein the polyisocyanate polyurethane resin (III) having two or more isocyanate end groups has an acid number of 20 to 200 mg KOH/g on a solid basis.