NON-AQUEOUS PIGMENT DISPERSION COMPOSITION

摘要

Disclosed is a process for producing a polymer for use in the dispersion of a non-aqueous pigment dispersion, which comprises the following steps (I) and (II): (I) producing a non-aqueous pigment dispersion composition [1] or a copolymer [2], wherein the non-aqueous pigment dispersion composition [1] comprises a pigment (A), a non-aqueous solvent (B), and a polymer (C) produced by reacting a copolymer (component (c1)) having a constituent unit derived from a vinyl monomer (c1a) having a reactive functional group and a constituent unit derived from a vinyl monomer (c1b) having a nitrogen atom with a poly(alkyl (meth)acrylate) and/or a polystyrene (component (c2)) each having, at one terminus, a functional group capable of reacting with the reactive functional group in the component (c1), and wherein the copolymer [2] has constituent units derived from the vinyl monomers (c1b) and (c1a) and produced by reacting the vinyl monomers (c1b) and (c1a) with each other; and (II) reacting the copolymer produced in the step (I) with the component (c2) to produce a graft copolymer having the component (c2) grafted to the copolymer.