Patent ID: 8722927

Claim:
A lubricating oil composition comprising a major amount of an oil of lubricating viscosity and a minor effective amount of one or more Mannich condensation products having the formula wherein each R is independently —CHR′—, wherein R′ is branched or linear alkyl having one to about 10 carbon atoms, cycloalkyl having from about 3 carbon atoms to about 10 carbon atoms, aryl having from about 6 carbon atoms to about 10 carbon atoms, alkaryl having from about 7 carbon atoms to about 20 carbon atoms, or aralkyl having from about 7 carbon atoms to about 20 carbon atoms, R 1 is a polyisobutyl group derived from polyisobutene containing at least 70 weight percent methylvinylidene isomer and having a number average molecular weight in the range of about 400 to about 2500; X is hydrogen, an alkali metal ion, or alkyl having one carbon atom to about 6 carbon atoms; W is —[CHR″]— m wherein each R″ is independently H, alkyl having one carbon atom to about 15 carbon atoms, or a substituted-alkyl 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 m is an integer from one to 4; Y is hydrogen, alkyl having one carbon atom to about 10 carbon atoms, —CHR′OH, wherein R′ is as defined above, or wherein Y′ is —CHR′OH, wherein R′ is as defined above; and R, X, and W are as defined above; Z is hydroxyl, a hydroxyphenyl group of the formula wherein R, R 1 , Y′, X, and W are as defined above, and n is an integer from 0 to 20, with the proviso that when n=0, Z must be wherein R, R 1 , Y′, X, and W are as defined above.