Mannichbase with dispersion and viscosity index improving properties, methods for improving storage resistance, their use and lubricating oils containing them.

摘要

Improved dispersant and VI-improving Mannich composition having reduced susceptibility to viscosity increase during storage, which composition comprises a physical blend prepared by admixing a phenolic compound with a Mannich condensation product obtained from the Mannich reaction of an oxidized polymer, an amine and a formaldehyde-yielding reagent. A method for reducing the tendency of a dispersant and VI-improving Mannich condensation product to increase viscosity during storage by admixing a phenolic compound. Use of the compositions as lubricant additives; and lubricant compositions containing them.