abstract |
Dispersant viscosity improvers for lubricating oil compositions comprisenreaction product of higher molecular weight olefinic reactants with carboxylicnreactants of the formula R 3 C(O)(R 4 ) n C(O)OR 5 (IV) or the corresponding acetals,nhemiacetals, ketals, and hemiketals thereof which is then reacted with at least one ofnammonia, a hydrazine or an amine. |