| 摘要 |
Provided are: a dispersant for obtaining a pigment dispersion and a coloring composition, each of which has small average particle diameter, low viscosity, excellent storage stability and excellent heat resistance; a pigment dispersion and a coloring composition, each of which uses this dispersant; and a color filter which is produced using this coloring composition. [1] A dispersant which has a structural unit A represented by formula (A) in the molecular structure, and wherein the average number of the structural unit A contained in each molecular structure is from 1.0 to 22.0 (inclusive) [2] A pigment dispersion for color filters, which contains a dispersant set forth in [1], an organic pigment and an organic solvent [3] A color filter which is produced using a color composition for color filters set forth in [2] [4] A method for producing a dispersant, which comprises a step 1 wherein a compound represented by formula (3) is reacted with a polyamine compound that has a structural unit B represented by formula (B) in the molecular structure, and wherein the average number of the structural unit B contained in each molecular structure is from 1.0 to 22.0 (inclusive) [5] A quaternary ammonium salt compound represented by formula (1) |
