Aminated polymeric additives for fuels and lubricants

Claim 1

A composition comprising a major proportion of a lubricating oil and dissolved therein about 0.25 to 10 wt. % of an oil-soluble sludge dispersing, viscosity-index improving product, which is free of haze contributing components comprising: the reaction product of a polyethylene amine with an oxygen containing, mechanically degraded copolymer of ethylene and one or more C 3 to C 8 alpha-olefins, said copolymer prior to degradation being characterized by: a. an ethylene content in the range of about 70 to 80 mole percent; b. a degree of crystallinity of 3 to 25 weight percent as determined by X-ray and differential scanning calorimetry; c. a weight average molecular weight (M w ) in the range of about 30,000 to 400,000; d. a number average molecular weight (M n ) in the range of about 10,000 to 100,000; and e. a range of molecular weights as measured by the ratio of M w /M n of 8 or less; said copolymer being degraded by mechanical working in the absence of solvent and in the presence of air at temperatures in the range of about 250° to 750° F., to thereby incorporate into said copolymer about 0.05 to 2.0 wt. % oxygen, based on the weight of the oxygenated copolymer; said amine having the general formula: ##STR3## wherein s is 2 and t is 2 to 6; and wherein only 50 to 95% of the oxygenated groups of said oxygenated copolymer are reacted with said amine by heating, whereby less than a stoichiometric amount of said amine is reacted and the presence of excess unreacted amine is avoided to thereby form a haze-free product.