| abstract |
Provided is a production method for a novel copolymer that is useful as a pigment dispersant, etc. The disclosed production method uses a copolymer precursor that contains a block chain (A), which includes at least one type of repeat unit selected from a group comprised of repeat units that contain tertiary amino groups and repeat units that contain quaternary ammonium bases, and a block chain (B), which includes repeat units represented by formula (II) and repeat units that contain protected acid groups represented by formula (I). This product is then heated to produce a block copolymer that contains the block chain (A) and a block chain (B1), which includes repeat units represented by formula (II) and repeat units that contain an acid group represented by formula (III). |