Low-chlorine, polyolefin-substituted, with amine reacted, alpha-beta unsaturated carboxylic compounds

A composition of matter comprising an amine acylated with a hydrocarbyl group substituted carboxylic acylating agent containing an average of about 1.3 to about 1.6 groups derived from α,β-unsaturated carboxylic compounds per equivalent of the hydrocarbyl group, wherein the equivalent weight of the hydrocarbyl is defined as its Mn, determined by GPC, which is about 1500 to about 3000, the amine comprises polyamine bottoms, and said acylated amine has total base number (TBN) of about 17 to about 35 on a neat chemical basis,

• wherein said hydrocarbyl group substituted carboxylic acylating agent (i) is prepared by direct thermal alkylation of an α,β-unsaturated carboxylic compound with a polyolefin, or (ii) is prepared by a process comprising forming a mixture of a polyolefin having a total of tetra- and tri- substituted unsaturated end groups up to 90 mole % based on moles of polyolefin and a halogen selected from the group consisting of chlorine and bromine, with an α,β-unsaturated carboxylic compound.