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PROCESS FOR THE PREPARATION OF AN ADDITIVE COMPOSITION, HIGHLY GRAFTED MULTIFUNCTIONAL OLEFIN COPOLYMER PREPARED BY SAID PROCESS AND LUBRICANT OIL COMPRISING SAID COPOLYMER
PROCESS FOR THE PREPARATION OF AN ADDITIVE COMPOSITION, HIGHLY GRAFTED MULTIFUNCTIONAL OLEFIN COPOLYMER PREPARED BY SAID PROCESS AND LUBRICANT OIL COMPRISING SAID COPOLYMER
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机译:由所述方法和包含所述共聚物的润滑油制备的添加剂组合物,高度接枝的多功能烯烃共聚物的制备方法
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摘要
The invention relates to a process for an additive composition comprising an amidized or imidized polymer. The invention further relates to a highly grafted, multi-functional lubricant additive useful to improve the viscosity index and dispersancy properties of a lubricating oil composition. The present invention also relates to a method of extending lubricant drain intervals and improving fuel economy and fuel economy durability. The additive composition is prepared by: (A) reacting an olefin copolymer of ethylene and at least one C3 to C23 α-olefin comprising from about 15 to 80 mole percent of ethylene, from about 20 to 85 mole percent of said C3 to C23 α-olefin and from about 0 to 15 wt percent of a polyene, said copolymer having a number average molecular weight ranging from 1,000 to 500,000, with an olefinic carboxylic acid acylating agent, said process comprising heating said polymer to a molten condition at a temperature in the range of 60°C to 240°C, grafting, in a first extruder or a first mixing device, said olefinic carboxylic acylating agent onto said copolymer, optionally subsequently reducing the molecular weight of said copolymer at a temperature in the range of 250°C to 350°C, thereby producing a grafted, reduced molecular weight acylated copolymer having a number average molecular weight ranging from 1,000 to 80,000 and having at least 0.2 - 20 molecules of said carboxylic acid acylating agent grafted per 1000 C atoms of said olefin copolymer, and (B) reacting, in a second extruder or a second mixing device, said acylated copolymer made in (A) with a polyamine.
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