Polyolefin graft polymers and lubricating compositions containing them.

摘要

Graft polymers derived from oil-soluble linear backbone polymers (e.g. ethylene-propylene polymers or ethylene-propylene-diene terpolymers) grafted with functional monomers obtained as the reaction products of unsaturated ketones, or preferably aldehydes (e.g. crotonaldehyde) and primary or secondary amines containing an N-heterocyclic ring, constitute additives, especially viscosity index improvers, for hydrocarbon lubricating compositions.