USE OF SURFACTANTS WITH LOW MOLECULAR WEIGHT AS AGENTS FOR IMPROVING THE FILTERABILITY IN LUBRICANTS

摘要

The invention concerns a lubricating fluid comprising: 1) a predominant amount of an oil with appropriate lubricating viscosity; and 2) an effective amount of an agent improving the filterability or one of their mixtures, corresponding to the following formula: R-Z, in which Z represents a polar group selected from the group consisting of a) phosphoric esters; b) amides; c) ethers; d) amino-alcohol's; e) ethoxylated amines or f) their mixtures, and R represents a lipophilic chain with 14 to 24 carbon atoms. The invention also concerns the use of the filterability-enhancing agent described above for improving the filterability of hydraulic oils, and a method for preparing hydraulic fluids with improved filterability.