High functionality low molecular weight oil soluble dispersant additives useful in oleaginous compositions

Abstract From the Canadian patent

Hydrocarbyl substituted C4 to C10 monounsaturated dicarboxylic acid, anhydrides or esters e.g. poly-, isobutenyl succinic anhydride preferably made by reacting, polymer of C2 to C10 monoolefin preferably polyisobuty-, lene, having a molecular weight of about 700 to 1200 preferably with a C4 to C10 monounsaturated acid anhydr-, ide or ester, preferably maleic anhydride such that there, are 1.2 to 2.0 dicarboxylic acid producing moieties per molecule of said olefin polymer used in the reaction mixture. The resulting materials may be further reacted with amines, alcohols, amino alcohols, boric acid etc. to, form dispersants.