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Ethylene alpha-olefin Mannich Base viscosity index improver/dispersant additives derived from amino phenols and monosecondary amines
Ethylene alpha-olefin Mannich Base viscosity index improver/dispersant additives derived from amino phenols and monosecondary amines
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机译:衍生自氨基酚和单仲胺的乙烯α-烯烃曼尼希碱粘度指数改进剂/分散剂
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摘要
The present invention is directed to oil-soluble lubricating oil viscosity index improver/dispersant additives comprising Mannich Base condensates of a grafted ethylene copolymer, an optionally alkyl- substituted N-hydroxyaryl compound, an aldehyde, and a monosecondary amine, whereby oil solutions, particularly oil concentrates, of said additives which are characterized by minimal viscosity change over an extended period of time. These additives comprise a copolymer of ethylene with one or more C.sub.3 to C.sub.28 alpha-olefins, preferably propylene, which have been grafted with acid moieties, e.g. maleic anhydride, preferably using a free radical initiator in a solvent such as a lubricating oil, which is then either (a) reacted with an N-hydroxyaryl amine and then condensed with an aldehyde and a monosecondary amine to form the Mannich Base viscosity index improver/dispersant material, or (b) reacted with a preformed Mannich Base condensate of an N-hydroxyaryl amine, aldehyde and the monosecondary amine. The invention also relates to process for preparing the preceding products and their use in oil compositions.
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