Patent ID: 6849686
Filing Date: 2005-02-01
Classification: B01F,C01P,C08F,C09B,C09C,C09D

Abstract:
1. A polymeric pigment dispersant having improved stability in a pigment dispersion for achieving efficient wetting and grinding of a pigment in the pigment dispersion, said polymeric pigment dispersant comprising the reaction product of: a first compound having a plurality of first hydroxyl groups; a carboxylic acid anhydride reactive with said first hydroxyl groups to form a carboxylate group; a second compound having at least one epoxy group reactive with said carboxylate group to form a second hydroxyl group; an amine reactive with said carboxylate group to form an acid anion group for salting the carboxylate group; and an acid for controlling a pH of the polymeric pigment dispersant such that the polymeric pigment dispersant has improved stability in the pigment dispersion in response to the modification of said pH.