Patent ID: 6852803

Claim:
A composition suitable for use as a pigment dispersant, comprising a graft copolymer having a polymeric backbone and macromonomer side chains attached to the backbone, wherein (1) the polymeric backbone consists essentially of polymerized ethylenically unsaturated monomers and (2) the side chains are macromonomers attached to the backbone at a single terminal point and consist essentially of polymerized ethylenically unsaturated monomers; wherein the graft copolymer has attached to either the backbone, the side chains or both, a urethane/urea group as the pigment anchoring group, wherein the urethane/urea group is formed by building hydroxyl functional groups into either the backbone, the side chains or both and then reacting the hydroxyl groups with a compound bearing at least two isocyanate groups, wherein at least one of the isocyanate groups is further reacted with ammonia or a primary or secondary amine containing compound.