POLYETHYLENE IMINE BASED PIGMENT DISPERSANTS

摘要

This invention refers to a novel process for the synthesis of polyethylene imine (PEI)-based pigment dispersants characterized by a "grafting from" approach, allowing the manufacture of solvent based dispersant systems. The polyethylene imine (PEI)-based pigment dispersant can be presented by the formula (I) X-(T)_m-P-(T)_n-H wherein P is a polyethyleneimine (PEI) backbone; T is a residue -CO-A-O- wherein A is C₂-C₁₂ alkylene optionally substituted with C₁-C₆ alkyl with the proviso that each linkage between P and T is an amide bond and each linkage between X and T is an ester bond, X is a modifier or terminator residue R-CO- wherein R is a linear or branched, saturated or unsaturated alkanecarboxylic acids having from 1 to 22 carbon atoms or an unsaturated fatty acid residue or a hydroxycarboxylic residue or a polyester residue obtained from polycondensation of hydroxycarboxylic acids, or an acid terminated polyether; n, m independently are a number from 1 to 100.