| abstract |
An olefin copolymer which comprises the reaction product of an acylatednolefin copolymer and a polyamine, wherein the acylated olefin copolymer comprisesnan olefin copolymer having grafted thereon from 0.3 to 0.75 carboxylic groups pern1000 number average molecular weight units of olefin copolymer and wherein thenolefin copolymer has a number average molecular weight of from 20,000 to 150,000.nThe copolymer is used as an additive in lubricating oil compositions where it acts as anviscosity modifier. |