Patent ID: 7662887

Claim:
A method for providing a polyalkene-substituted carboxylic acid, carboxylic anhydride or carboxylic ester by a halogen-assisted reaction of a polyalkene and at least one olefinic monounsaturated mono- or di-carboxylic acid, anhydride or ester, said method comprising: reacting polyalkene and at least one olefinic monounsaturated mono- or di-carboxylic acid, anhydride or ester in the presence of halogen and at least one metal compound, wherein said metal is selected from the group consisting of Mg, Ca, Ti, Zr, Hf, Cr, Mo, Mn, Fe, Co, Ni, Pd, Pt, Cu, Zn, Al and Sn; and said at least one metal compound is introduced into the reaction prior to a time at which greater than 85 mass % of said polyalkene has reacted with said olefinic monounsaturated mono- or di-carboxylic acid, anhydride or ester, in an amount introducing from about 0.01 to about 5 ppm by mass of elemental metal, based on the mass of polyalkene.