Polyester lubricant additives, their preparation and compositions containing them

DETAILED DESCRIPTION We claim: 1.
A lubricating composition comprising a major amount of lubricating oil and a minor amount sufficient to impart dispersant properties to said oil of a polyester additive which is the product of the reaction at elevated temperature from reflux up to about 210.
degree.
C.
with removal of water of a polyolefin substituted succinic acid or anhydride wherein said polyolefin substituent has a molecular weight of about 700-3,000 with a substituted carboxypyrrolidone of the following formula A ##STR14## in which (a) R is selected from the group consisting of a hydrogen atom, an alkyl containing up to 8 carbon atoms, a phenyl group, a benzyl group, a hydroxyalkyl group containing 1-3 hydroxy radicals, a polyoxyalkylenealkyl group containing up to an average of about 2 oxyalkylene groups, a hydroxyalkylaminoalkyl group, a carboxypyrrolidone substituted C.
sub.
2-6 alkyl group, and an imidazoline substituted C.
sub.
1-4 alkyl group, (b) each R.
sup.
1 is independently selected from a group consisting of ##STR15## (c) R.
sup.
6 is selected from the group consisting of alkyl groups containing up to 8 carbon atoms, polyoxyalkylene alkyl groups containing up to an average of about 2 oxyalkylene groups, hydroxyalkyl groups containing 1-3 hydroxy radicals, imidazoline substituted C.
sub.
1-4 alkyl groups, and groups having the formula ##STR16## in which the groups R and R.
sup.
2 independently are as herein defined, (d) R.
sup.
2 is alkylene containing 2-6 carbon atoms, (e) R.
sup.
7 is selected from the group consisting of alkyl groups containing up to 8 carbon atoms, hydroxyalkyl groups containing 1-3 hydroxy radicals, dialkylaminoalkyl groups, hydroxyalkylaminoalkyl groups, imidazoline substituted C.
sub.
1-4 alkyl groups, groups having the formula ##STR17## and groups having the formula ##STR18## in which the groups R and R.
sup.
2 independently are as herein defined, (f) R.
sup.
8 is selected from the group consisting of hydrogen, alkyl groups containing up to 8 carbon atoms, hydroxyalkyl groups containing up to 3 hydroxy groups, dialkyl aminoalkyl groups, imidazoline substituted C