Patent ID: 8202926

Claim:
A coating composition containing negatively charged or chargeable solid particulates, the composition comprising one or more dispersants in association with an aqueous dispersing medium, the one or more dispersants each comprising a compound having an anchoring moiety linked to a polymeric hydrophilic moiety, the anchoring moiety containing at least one basic group and having an overall basicity and the polymeric hydrophilic moiety comprising a polyacrylamide or a polymethacrylamide and having a lower affinity for a surface of the particulates than the anchoring moiety; further wherein said compound has the formula (I): wherein A is carbon or nitrogen; R′ is hydrogen or an alkyl, aryl or heterocyclic group and m is 1 when A is carbon and m is 0 when A is nitrogen; B is a basic group; each of D and E is independently hydrogen, an alkyl group, a basic group, an acid group, or an ester or amide of an acid group; and y is 0 or 1; L, L B and L D are linking groups, which are the same or different, z is 1, p and q are each independently 0 or 1, and wherein L is selected from the group consisting of sulfur, alkylene, thioalkylene, ester, thioester, amide, thioamide, ketone, thioketone, ether, and thioether; B, L B , D, L D and L may combine with A to form one or more rings which may include one or more further heteroatoms selected from the group consisting of nitrogen, oxygen and sulfur; each M is a monomer unit, which may be the same or different, comprising an acrylamide or methacrylamide; and x is 10-200; and F is hydrogen or a halogen atom, an alkyl group, a thiol, a neutral thioether, an ether, an ester, or an alkyl- or aryl-sulfonate group; with the proviso that the number of basic groups in the anchoring moiety is greater than the number of any acid groups therein.