Pigment dispersion agent, method for producing pigment dispersing agent and pigment dispersion solution

摘要

Problem to be solved: to provide a pigment dispersing agent capable of preparing a pigment dispersion liquid which is low viscosity and exhibits good coloring performance, excellent in dispersion stability and long term preservation of pigments, as a material for colorants for color filters."Pigment dispersing agent" which is a polymer satisfying the requirements of [1] to [3].[1] it has a constitutive unit (1) derived from monomer 1 represented by the following general formula (1) (R1: hydrogen atom or methyl group, R2: alkylene group having 2 to 4 carbon atoms, N: 5 to 20), and predetermined constituent units (2) and (3).[2] the total content of the constituent units (1) to (3) is 80% by mass or more, and the content of the constituent unit (1) is 50 to 70% by mass.The number average molecular weight is from 5000 to 20000, and the acid value is 30 to 130 mgKOH / g.No selection