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The residual chlorine content of a polyolefin-substituted carboxylic acylating agent formed by a halogen-assisted reaction of a polyalkene and at least one olefinic, monounsaturated mono- or dicarboxylic acid, anhydride or ester, is reduced when the reaction is conducted in the presence of a control

The residual chlorine content of a polyolefin-substituted carboxylic acylating agent formed by a halogen-assisted reaction of a polyalkene and at least one olefinic, monounsaturated mono- or dicarboxylic acid, anhydride or ester, is reduced when the reaction is conducted in the presence of a controlled amount of a metal compound.

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What is claimed: 1. 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 po

What is claimed: 1. 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. 2. The method of claim 1, wherein said metal compound is introduced into the reaction pre-mixed with, or concurrent to the introduction of, said polyalkene. 3. The method of claim 2, wherein said metal compound is introduced into the reaction pre-mixed with said polyalkene. 4. The method of claim 1, wherein said at least one metal compound is introduced into the reaction in an amount introducing from about 0.1 to about 2 ppm by mass of elemental metal, based on the mass of polyalkene. 5. The method of claim 1, wherein said metal of said at least one metal compound is selected from the group consisting of Ti, Fe, Co, Ni, Cu, Zn and Al. 6. The method of claim 5, wherein said metal of said at least one metal compound is selected from the group consisting of Fe, Co and Cu. 7. The method of claim 6, wherein said metal of said at least one metal compound is Fe. 8. The method of claim 1, wherein said metal compound is a polyalkene-soluble metal compound. 9. The method of claim 5, wherein said metal compound is a polyalkene-soluble metal compound. 10. The method of claim 6, wherein said metal compound is a polyalkene-soluble metal compound. 11. The method of claim 7, wherein said metal compound is a polyalkene-soluble compound. 12. The method of claim 11, wherein said at least one polyalkene-soluble metal compound is selected from the group consisting of Fe naphthanate, neo-decanoate, Fe(III) 2 ethyl hexanoate, Fe(III) acetyl acetonate, Fe(II) stearate, and Fe(III) 2,4 pentanedionate. 13. The method of claim 1, wherein said polyalkene is polyisobutene, said olefinic, monounsaturated mono- or di-carboxylic acid, anhydride or ester is selected from the group consisting of fumaric acid, itaconic acid, maleic acid, maleic anhydride, chloromaleic acid, chloromaleic anhydride, acrylic acid, methacrylic acid, crotonic acid, cinnamic acid, and C1 to C4 alkyl acid esters thereof, and said halogen is chlorine or bromine. 14. The method of claim 13, wherein said polyalkene is polyisobutylene, said olefinic monounsaturated mono- or di-carboxylic acid, anhydride or ester is maleic anhydride and said halogen is chlorine. 15. The method of claim 14, wherein said polyisobutylene has a number average molecular weight ( Mn) of from about 900 to about 3000. 16. The method of claim 15, wherein said polyisobutylene has greater than about 60% tri- and tetra-substituted unsaturated end groups. 17. The method of claim 16, wherein said polyisobutylene is derived from a C4 petroleum feed stream containing from about 10 to about 75 mass % of isobutene, based on the total mass of olefin. 18. The method of claim 1, wherein (A) said at least one olefinic monounsaturated mono- or di-carboxylic acid, anhydride or ester and (B) said polyalkene are charged for reaction in a molar ratio (A/B) of from about 0.9 to about 2.5. 19. The method of claim 18, wherein (C) said halogen is introduced into the reaction in a molar ratio (C/B) of from about 1.2 to about 3.5. 20. The method of claim 19, wherein said at least one olefinic monounsaturated mono- or di-carboxylic acid, anhydride or ester and said polyalkene are reacted together for from about 1 to about 15 hours, at a temperature of from about 100° C. to about 240° C. 21. The method of claim 20, wherein the temperature is raised during the reaction and introduction of said halogen begins at a temperature of from about 100° C. to about 170° C., and ends at a temperature of from about 180° C. to about 240° C. 22. The method of claim 21, wherein about 8 mass % to about 35 mass % of the total amount of halogen is introduced into the reaction per hour. 23. The method of claim 22, wherein at least 70 mass % of said halogen is introduced into the reaction before the reaction mixture reached 180° C. 24. The method of claim 23, wherein said polyalkene is polyisobutylene, said at least one olefinic, monounsaturated mono- or di-carboxylic acid, anhydride or ester is maleic anhydride and said halogen is chlorine. 25. The method of claim 24, wherein said metal compound is Fe(III) neodecanoate. 26. The method of claim 1, wherein said polyalkene-substituted carboxylic acid, carboxylic anhydride or carboxylic ester product has a functionality of from about 1.2 to about 1.7. 27. The method of claim 11, wherein said polyalkene and said at least one olefinic, monounsaturated mono- or di-carboxylic acid, anhydride or ester are reacted in the absence of elemental metal and polyalkene-insoluble metal compounds. 28. The method of claim 1, wherein said metal of said at least one metal compound is selected from Co, Sn, Ti, Zn, Ni and Cu. 29. The method of claim 28, wherein said metal of said at least one metal compound is selected from Ni and Cu. 30. The method of claim 29, wherein said metal compound is selected from polyalkene-soluble Ni and Cu compounds. 31. The method of claim 30, wherein said polyalkene-soluble Ni and Cu compounds are selected from the group consisting of Ni(II) 2-ethylhexanoate; Cu(II) 2-ethylhexanoate; and Cu(I) acetate.