| abstract |
A reaction product for use as a viscosity index improver in lubricating oils obtained by reacting: a) an oil-soluble ethylene-alpha-olefin copolymer comprising 10 wt% to less than 80 wt% ethylene and more than 20 wt% Up to 90% by weight of at least one C 3 -C 28 α-olefin, said copolymer having a number average molecular weight of from about 5,000 to 120,000 and grafted with 0.5 to 5% by weight of an ethylenically unsaturated acylating agent, and b ) hydrocarbyl substituted poly(oxyalkylene) monoamines having the formula: R 1 -(O-CHR 2 -CHR 3 ) x -A wherein: R 1 is a hydrocarbyl group having from about 1 to about 35 carbon atoms; R 2 and R 3 are each independently hydrogen, methyl or ethyl, and each R 2 and R 3 are independently selected in each -O-CHR 2 -CHR 3 -unit; A is amino, -CH 2 amino or N-alkylamino having about 1 to 10 carbon atoms; and x is an integer from 2 to 45. |