| abstract |
A method for preparing a dispersant composition characterized by dissolving in an oil a secondary proportion of a graft copolymer having a polymer base of a monoethylenically unsaturated polymerizable monomer or a mixture of such monomers. at least one of said monomers being an ester having an alkyl portion of a size sufficient to produce the solubility of the oil-grafted copolymer, said ester being selected from at least one member of the class consisting of acrylic acid alkyl esters , methacrylic, itaconic and fumaric, vinyl esters of alkanoic acids, and mixtures of said esters, said base polymer having units grafted therein of maleic acid and/or itaconamic acid in which the nitrogen of the units of amic acid carries the group ** (See formula) ** where n is an integer of 2 or 3, and A is an alcohol group having 2 or 3 carbon atoms, the units of amic acid being about 1% to 22% of the weight of the graft copolymer. (Machine-translation by Google Translate, not legally binding) |