As compared with conventional polymethacrylate-base viscosity index improvers, the invention improver is excellent in low-temperature viscosity characteristics and oxidation resistance.
The random copolymer having a different viscosity range is useful as a viscosity index improver and a compatibilizing agent for a lubricating oil.
This invention also relates to methods of making a dispersant viscosity index improver and methods for making a lubricating oil.
The composition can be further grafted and derivatized to provide a viscosity index improver, the composition being produced directly with the correct viscosity, without the need for additional blending, shearing or masticating steps.
The invention also provides a lubricating oil composition comprising a base oil and the viscosity index improver or the compatibilizing agent.
In one preferred illustrative embodiment, the delayed phase changing agent is delivered in the form of a pill, the pill including a carrier fluid, a viscosifier and the delayed phase changing agent.
Requêtes fréquentes français :1-200, -1k, -2k, -3k, -4k, -5k, -7k, -10k, -20k, -40k, -100k, -200k, -500k, -1000k,
Requêtes fréquentes anglais :1-200, -1k, -2k, -3k, -4k, -5k, -7k, -10k, -20k, -40k, -100k, -200k, -500k, -1000k,
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