Patent ID: 8153716
Filing Date: 2012-04-10
Classification: B01F,C01P,C09C,C09D

Abstract:
1. A coating composition containing positively charged or chargeable solid particulates, the composition comprising one or more dispersants in association with an aqueous dispersing medium, wherein said dispersant comprises a compound having an anchoring moiety linked to a polymeric hydrophilic moiety, said anchoring moiety containing at least one acid and/or hydroxy group and having an overall acidity or neutrality and said polymeric moiety having a lower affinity for surfaces of the solid particulates than said anchoring moiety and wherein said solid particulates are selected from the group consisting of metal oxides, metal hydroxides, metal carbonates, nitrides, ceramics, metals and latexes, all at a pH below their isoelectric point; 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 an acid group or an ester or amide thereof, or a hydroxy group; each E is independently hydrogen, an amino group or an acid group or an ester or amide of an acid group, and n is 0 or an integer from 1 to 10; D is a hydrogen atom, an amino group, an acid group or an ester or amide of an acid group, an alkyl group, or an alkyl group substituted with one or more acid groups or an ester or amide of an acid group; G is a carbonyl group or an alkylene, aminoalkylene or oxyalkylene group and p is 0 or 1; L is a linking group selected from the group consisting of sulfur and alkylene, ester, thioester, amide, thioamide, ketone, thioketone, ether, thioether and polyalkylenethio groups, and z is 1; D and L or D, G and L may combine with A to form a 5-, 6- or 7-membered ring 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 5-200; 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 (a) the number of acid groups is equal to or greater than the number of amino groups therein and (b) there is at least one hydroxy or acid group.