ETHYLENE ALPHA-OLEFIN POLYMER SUBSTITUTED MANNICH BASE USEFUL AS MULTIFUNCTIONAL VISCOSITY INDEX IMPROVER FOR OLEAGINOUS COMPOSITION

摘要

The present invention is directed to oil-soluble lubricating oil additives comprising Mannich Base condensates of an alkyl substituted hydroxy aromatic compound with formaldehyde and an amine, wherein the alkylmoiety of the aromatic compounds is derived from at least one ethylene alpha-olefin copolymer of greater or above 20,000 to about 500,000 number average molecular weight, wherein at least about 30% of the polymer's chains contain terminal ethenylidene unsaturation. The Mannich Base condensates of this invention are useful as multifunctional viscosity index improvers for oleaginous compositions, particularly lubricating oil compositions.