Lubricating oil composition comprising dispersant comb polymers

Abstract

The present invention is directed to selected comb polymers comprising specifiedamounts of macromonomer and nitrogen-containing (meth)acrylates, their preparation, lubricant compositions comprising such comb polymers and their use as solubilizersinlubricant compositions, especially inengine oil (EO) compositions.

Description

technical field [0001] The present invention relates to selected comb polymers comprising specified amounts of macromers and nitrogen-containing (meth)acrylates, their preparation, lubricant compositions comprising such comb polymers and their use in lubricants Use as solubilizer in compositions, especially in engine oil (EO) compositions. Background technique [0002] The automotive industry has a strong interest in fuel economy. To increase fuel economy, engine oils need to incorporate effective friction modifiers (FM). Molybdenum dithiocarbamate (MoDTC) is a commonly used FM and is superior in antifriction performance compared to other FMs, especially in boundary lubrication mode. [0003] The purpose of a lubricant is to reduce the amount of friction between two surfaces. In some cases, the lubricant's base oil may not have sufficient lubricity to perform this function adequately. In this case, friction modifiers are added to increase the lubricity of the oil. Frict...

AI Technical Summary

Problems solved by technology

The disadvantage of molybdenum dialkyldithiocarbamates is that they do not have the desired solubility, especially at lower temperatures, causing the compound to separate from the lubricating composition, leading to the formation of haze, cloud or sediment, thus reducing its effectiveness

However, the effect of such comb polymers on the solubility of molybdenum in lubricating formulations is not disclosed therein

Images