PROCESS FOR THE PREPARATION OF AN AMINE MODIFIED COPOLYMER AS A PIGMENT DISPERSANT FOR CATHODIC ELECTROCOATING COMPOSITIONS

摘要

The present invention is directed to a process for the preparation of amine modified copolymers as a pigment dispersant for cathodic electrocoating compositions comprising the steps of a) polymerizing i) an ethylenically unsaturated monomer containing an isocyanate group with ii) other ethylenically unsaturated monomers having no functional group capable of undergoing a reaction with said isocyanate group to form a copolymer with isocyanate groups and b) reacting stepwise or simultaneously said isocyanate groups with iii) a compound selected from the group consisting of a polyalkyleneglycol monoalkyl ether, an aminoterminated polyalkylene glycol monoalkyl ether and mixtures thereof and iv) a compound containing at least a tertiary amine group and one functional group capable of undergoing a reaction with said isocyanate group and v) optionally, another compound having one functional group capable of undergoing a reaction with said isocyanate group.