Patent No. U.S. 6,916,367 B2
Cabot Corporation has obtained a patent for a modified pigment preparation that is comprised of a pigment having attached a group comprising the formula -X-Sp-S-[PI], wherein X is an arylene, heteroarylene, or alkylene group, Sp is a spacer group, and PI represents a polymeric group comprising at least one ionic or ionizable group comprising the reaction product of a polymer having at least one anhydride, at least one activated carboxylic acid, or at least one carboxylic acid or salt thereof and an alkylamine, arylamine, or alcohol.