Patent Number: 6,441,066

Title: Pigment dispersions containing dispersants prepared by controlled radicalpolymerization and having pendent hydrophobic polymeric segments

Abstract: A pigment dispersion comprising pigment, an aqueous carrier selected fromwater and a mixture of water and at least one organic solvent, and apigment dispersant is described. The pigment dispersant is prepared bycontrolled radical polymerization, e.g., atom transfer radicalpolymerization, of a radically polymerizable monomer in the presence of apolymeric initiator having at least one radically transferable group. Thepolymeric initiator forms the polymeric backbone segment of the pigmentdispersant, and the monomer forms polymeric segments that are pendent tothe polymeric backbone segment. The pigment dispersant has comb-likearchitecture in which the polymeric backbone segment is hydrophilic, andat least a portion of each pendent polymeric segment is hydrophobic.

Inventors: Woodworth; Brian E. (Mars, PA), Coca; Simion (Pittsburgh, PA), O'Dwyer; James B. (Valencia, PA)


International Classification: C08K 5/00 (20060101); C09B 67/00 (20060101); C09D 17/00 (20060101); C09B 67/46 (20060101); C09D 7/02 (20060101); C08K 005/48 (); C08K 003/00 ()

Expiration Date: 08/27/2014