Copolymers and their reaction products with amines as fuel and lubricant additives

A process for the preparation of lubricating oil composition, comprising adding to a lubricating oil 1-15% by weight of:

• a copolymer obtained by free radical copolymerization of components consisting essentially of:
• (a) 20-60 mol % of at least one monoethylenically unsaturated C4-C6-dicarboxylic acid or an anhydride thereof,
• (b) 10-70 mol % of at least one copolymerizable oligomer composed of at least 3 olefin molecules of propene or of a branched 1-olefin of 4 to 10 carbon atoms, having an average molecular weight Mw of from 300 to 5000 g/mol, and having a terminal copolymerizable group in the form of a vinyl, vinylidene or alkvl vinylidene group, and
• (c) 1-50 mol % of at least one monoethylenically unsaturated compound which is copolymerizable with the monomers a) and b) and is selected from the group consisting of a linear1-olefin of 2 to 40 carbon atoms, a monoethylenically unsaturated monocarboxylic acid of 3 to 10 carbon atoms, an alkyl vinyl ether and an allyl alkyl ether where the alkyl group is hydroxyl, amino, dialkylamino or alkoxy substituted or is unsubstitutcd and contains 1 to 40 carbon atoms, an alkyl ester, an alkyl amide and a N-alkylamide of a monoethylenically unsaturated mono- or dicarboxylic acid of 3 to 10 carbon atoms where the alkyl substituent contains 1 to 40 carbon atoms, a vinyl ester and an allyl ester of a monocarboxylic acid of 1 to 30 carbon atoms, a N-vinylcarboxamide of a carboxylic acid of 1 to 8 carbon atoms, a N-vinyl compound of a nitrogen-containing heterocyclic, said copolymer of (a), (b) and (c) being subsequently reacted with
• (d) an amine of the formula HNR1R2, where R1 and R2 are identical or different and each is hydrogen, an aliphatic or aromatic hydrocarbon radical, a primary or secondary, aromatic or aliphatic aminoalkylene radical, a polyaminoalkylene radical, a hydroxyalkylene radical, a polyoxyalkylene radical, a polyoxyalkylene radical carrying at least one terminal amino group, or a heteroaryl or heterocyclic radical which optionally carries at least one terminal amino group, or, together with the nitrogen atom to which they are bonded, form a ring.