Comb Polymers Solubilize Molybdenum Friction Modifiers

The patent introduces a solubilizing agent as an intermediary substance that mediates between the molybdenum dithiocarbamate friction modifier and the API Group III or Group III+ base oil. This solubilizing agent has affinity for both the polar friction modifier and the non-polar base oil, enabling the friction modifier to remain dissolved and effective without causing haze or precipitation. The solubilizing agent acts as a bridge that resolves the incompatibility between the polar head group of the friction modifier and the non-polar base oil matrix.

The patent changes the chemical composition parameters of the lubricant by incorporating molybdenum dithiocarbamate friction modifiers and solubilizing agents. This allows the use of lower viscosity base oils (improving fuel economy) while the additive package compensates for the reduced film-forming capability. The molybdenum compound forms protective tribofilms on metal surfaces that maintain adequate lubrication even when the hydrodynamic film is thinner due to lower viscosity.

The solubilizing agent serves as a mediator that enables higher concentrations of molybdenum dithiocarbamate to remain in solution. By incorporating this intermediary substance, the patent overcomes the solubility limit that would otherwise constrain the dosage of friction modifier. The solubilizing agent molecules surround and stabilize the polar molybdenum compounds, allowing them to disperse uniformly in the non-polar base oil at higher concentrations without precipitating.