Patent ID: 6326420
Filing Date: 2001-12-04
Classification: C09B,C09D

Abstract:
A pigment dispersion comprising:(a) pigment;(b) an aqueous carrier selected from water and a mixture of water and at least one organic solvent; and(c) a pigment dispersant prepared by controlled radical polymerization in the presence of a monomeric initiator having at least two radically transferable groups, and in which said pigment dispersant has at least one of the following polymer chain structures,.phi.-[(G).sub.p --(E).sub.s --T].sub.zand.phi.-[(E).sub.s --(G).sub.p --T].sub.zwherein G is a hydrophobic residue of at least one radically polymerizable ethylenically unsaturated monomer; E is a hydrophilic residue of at least one radically polymerizable ethylenically unsaturated monomer; .phi. is a residue of or derived from said initiator, and is free of said radically transferable group; T is or is derived from said radically transferable group of said initiator; z is independently for each structure a number from 2 to 10; p and s represent average numbers of residues occurring in a block of residues; p and s are each at least one and are selected independently for each structure such that said pigment dispersant has a number average molecular weight of at least 500.