Process for production of polyisobutenylsuccinic anhydrides without formation of resins
AssigneeInstitut Francais du Petrole
InventorsPatrick Gateau, Daniel Binet, Jean-Pierre Durand
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Abstract
An alkenyl anhydride or polyalkenylsuccinic anhydride is prepared without forming resins, by an ene-synthesis reaction between an olefin or a polyolefin and a maleic anhydride, optionally substituted by one or two methyl groups, in an aromatic solvent that is selected from toluene and xylenes, whereby said anhydride is used at a ratio of 30 to 60% by weight relative to the reaction medium. More particularly, polyisobutenylsuccinic anhydrides which can be used to form, by reaction with polyethylene polyamines, compositions that contain polyisobutenylsuccinimides, used as detergent additives for motor fuels or as ashless dispersants for motor oils, are produced.
Claims19
A process comprising contacting under ene-synthesis reaction conditions at least one polyisobutene having a content of external double bonds that is greater than 50%, with at least one unsaturated dicarboxylic anhydride which is maleic anhydride or maleic anhydride substituted by 1 or 2 methyl groups, in at least one aromatic solvent that is toluene or a xylene;
- said aromatic solvent being employed at a ratio of 35 to 60% by weight relative to the reaction medium, whereby a polyisobutenylsuccinic anhydride is produced.
A process comprising contacting under ene-synthesis reaction conditions at a temperature of 180.degree.-250.degree. C., at least one polyisobutene having a content of external double bonds that is greater than 50%, with at least one unsaturated dicarboxylic anhydride which is maleic anhydride or maleic anhydride substituted by 1 or 2 methyl groups, in at least one aromatic solvent that is toluene or a xylene;
- said aromatic solvent being employed at a ratio of 35 to 60% by weight relative to the reaction medium, whereby a polyisobutenylsuccinic anhydride is produced.
Dependencies are inferred from the claim text.