Patent ID: 7875747

Claim:
A dispersant compound obtained by (a) reacting (i) a polycarbonyl compound of formula (I) having at least three carbonyl acylating functions: where n ranges from 0 to about 10, and where R 1 , R 2 , R 3 , R 4 and R 5 are independently chosen from a hydrogen atom and C 1 to C 10 linear or branched alkyl groups, with (ii) a primary amine moiety of a polyamine having formula (II): wherein R 6 is a hydrogen atom or a low molecular weight alkyl group having from about 1 to about 6 carbon atoms, m is an integer ranging from about 1 to about 3, and n is an integer ranging from about 2 to about 10, to produce a first polyamide product, wherein the ratio of polycarbonyl compound to primary amine compound ranges from about 1:1 to about 1:5; and (b) reacting said first polyamide product with a hydrocarbyl carbonyl compound having formula (IV): wherein R 14 is a hydrocarbyl group, in a ratio of one equivalent per amide equivalents present in (a).