| 摘要 |
Succinimide derivatives of copolymers of ethylene and an alpha-olefin, such as ethylene-propylene copolymer, are useful as shear stable viscosity index (VI) improvers and dispersants in lubricating oils. Especially useful is the N-(3-dimethylaminopropyl) succinimide of the copolymer of ethylene and an alpha-olefin, such as ethylene-propylene copolymer. This succinimide is obtained by reacting ethylene-propylene copolymer in a solvent, such as chlorobenzene, with maleic anhydride and a peroxide, such as dicumylperoxide. The resulting succinic anhydride is then reacted with 3-dimethylaminopropylamine to produce the resulting dimethylaminopropyl succinimide derivatives of the ethylene-propylene copolymer. The succinimide derivatives of this invention are advantageously incorporated in minor amounts, such as in the range 0.05-10% by weight based on the overall composition, in lubricating oils, such as petroleum based automotive lubricating oils, to improve the physical properties thereof. For example, the succinimide derivatives of this invention, when added to petroleum based lubricating oils, act as shear stable VI improvers and dispersants. |
