Dispersant-viscosity improvers for lubricating oil compositions

Details Dispersant-viscosity improvers for lubricating oil compositions Dispersant-viscosity improvers for lubricating oil compositions

C - Chemistry, Metallurgy

10

M

C10M 159/12 (2006.01) C10M 133/52 (2006.01) C10M 143/12 (2006.01) C10M 145/20 (2006.01) C10M 149/22 (2006.01)

Patent

CA 2170202

A composition of matter suitable for use as a dispersant-viscosity improver for lubricating oil compositions comprises the reaction product of reactants comprising (a) an oil soluble, substantially hydrogenated, vinyl substituted aromatic-aliphatic conjugated diene block copolymer said copolymer having a number average molecular weight ranging from about 30,000 to about 300,000, grafted with an ethylenically unsaturated carboxylic acid or functional derivative thereof; (b-1) at least one polyester containing at least one condensable hydroxyl group; and (b-2) at least one polyamine having at least one condensable primary or secondary amino group, and optionally, (c) at least one hydrocarbyl substituted carboxylic acid or anhydride.

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