. . "wherein R8 and R9 are an alkyl or substituted alkyl of sufficient chain length to give the resulting molecule stability in lubricating oils and fuels, thus R8 generally has at least about 30 carbon atoms, preferably at least about 50 carbon atoms and R9 is a lower alkyl of from about 1 to about 6 carbon atoms, with an unsaturated acidic reactant in the presence of a free radical initiator." . . .