VISCOSITY GROWTH INHIBITION IN OIL ADDITIVE CONCENTRATES

摘要

A method is disclosed for inhibiting the rate of viscosity growth in an oil concentrate of a VI-dispersant prepared form a copolymer of ethylene and at least one C3-C16 alpha olefin, wherein said copolymer has been grafted with at least one unsaturated carboxylic acid-containing material, further reacted with an amount of a polyamine sufficient to neutralize said acid containing material, or at least one unsaturated nitrogen-containing material, comprising blending a primary antioxidant into said concentrate as a top treatment or as a displacement for an equal amount of diluting oil.