Patent ID: 8455681

Claim:
A Mannich condensation product prepared by the Mannich condensation of: (a) a polyisobutyl-substituted hydroxyaromatic compound, wherein the polyisobutyl group is derived from polyisobutene containing at least 70 weight percent methylvinylidene isomer and has a number average molecular weight in the range of from about 400 to about 2500; (b) an aldehyde; (c) an amino acid or ester derivative thereof having the formula wherein W is —[CHR″]— m wherein each R″ is independently H, alkyl having one carbon atom to about 15 carbon atoms, or a substituted-all having one carbon atom to about 10 carbon atoms and one or more substituents selected from the group consisting of amino, amido, benzyl, carboxyl, hydroxyl, hydroxyphenyl, imidazolyl, imino, phenyl, sulfide, or thiol; and in is an integer from one to 4, A is hydrogen or alkyl having one carbon atom to about 6 carbon atoms; and (a) an alkali metal base.