| 摘要 |
A polymeric dispersing agent consisting of an oligo or polyamide chain, wherein all nitrogen atoms are part of amido bonds, said oligo or polyamide chain being connected with at least one polymeric chain, each polymeric chain having a molecular weight of at least 1000. The dispersing agent shows high affinity to particles of "acidic" character, such as certain pigments, and is therefore capable of effectively dispersing such particles in organic liquids. The dispersing agent is prepared (1) by reacting a diamine with an amino acid and optionally reacting the reaction product thus formed with a dicarboxylic acid so as to form a reaction product which is reacted with a polyester forming hydroxycarboxylic acid, or (2) by reacting a diamine with a dicarboxylic acid so as to form an oligo or polyamide which is reacted with a polyester forming hydroxycarboxylic acid. A dispersion of solid particles in an organic liquid and the polymeric dispersing agent contains from 1 to 20% by weight of the dispersing agent based on the weight of solid particles. |
