IMIDE AND PYRROLIDONE GREASE THICKENERS WITH TEREPHTHALATE COMPLEXING AGENT

摘要

A grease composition comprises an effective amount of a lubricating oil containing an imide or pyrrolidone thickening agent or an imide or pyrrolidone thickening agent comprising a metal salt of a carboxylic acid in combination with a bimetal phthalate complexing agent, such as dilithium terephthalate. The presence of the complexing agent results in a grease having properties superior to that of a similar grease without the complexing agent. Preferred complexing agents are dimetal terephthalates in which the metal is an alkali or alkaline earth metal and is the same metal as is present in the thickener. An example is a combination of a calcium or lithium salt of the reaction productof trimellitic anhydride with a hydrogenated rapeseed amine and a dilithium terephthalate complexing agent.