Patent ID: 7049273

Claim:
A method for preparing a hybridized, acylated olefin copolymer comprising the steps: a) preparing an oil- or solvent-solution of an acylated olefin copolymer and having a carboxylic reactant/olefin copolymer ratio of less than two, wherein the copolymer has carboxylic acid acylating functionality randomly within the structure, b) preparing at least one coupling compound wherein the coupling compound contains one or more amino group capable of reacting with the carboxylic group of the acylated olefin copolymer, and wherein the coupling compound is a product of the reaction of a polyamine and polyisobutylene phenol, and, after preparing a) and b), c) reacting the acylated olefin copolymer with the coupling compound to effect coupling of one or more acylated olefin copolymers.