Lubricating composition

Claim 1

A LUBRICATING OIL COMPOSITION COMPRISING A MAJOR PROPORTION OF A SYNTHETIC ESTER LUBRICATING OIL AND A MINOR LOAD-CARRYING IMPROVING AMOUNT OF A SUBSTANTIALLY NEUTRAL, SILICON-CONTAINING PRODUCT OF A SYNTHETIC ESTER LUBRICATING OIL REACTED WITH A SILICON MATERIAL, WHEREIN SAID SYNTHETIC ESTER IS SELECTED FROM THE GROUP CONSISTING OF ALCOHOL DIESTERS OF SATURATED ALIPHATIC DICARBOXYLIC ACIDS, COMPLEX ESTERS FORMED BY REACTION OF DICARBOXYLIC ACIDS WITHH GLYCOLS AND MONOHYDRIC ALOHOLS, AND COMPLEX ESTERS FORMED BY REACTION OF DICARBOXYLIC ACIDS WITH GLYCOLS AND WITH MONOCARBOXYLIC ACIDS, SAID DIESTERS HAVING A TOTAL OF FROM 20 TO 36 CARBON ATOMS PER MOLECULE AND SAID COMPLEX ESTERS HAVING A TOTAL OF 20 TO 60 CARBON ATOMS PER MOLECULE, AND WHEREIN SAID SILICON MATERIAL HAS THE GENERAL FORMULA: R3SIX, WHEREIN X IS SELECTED FROM THE GROUP CONSISTING OF HALOGEN AND HYDROXY GROUPS AND R IS SELECTED FROM THE GROUP CONSISTING OF X AND C1 TO C15 HYDROCARBON RADICALS, SAID REACTION BETWEEN SAID SYNTHETIC ESTER OIL AND SAID SILICON MATERIAL BEING CONDUCTED AT A TEMPERATURE IN THE RANGE OF ABOUT 40*C. TO 165*C. FOR FROM 1 TO 16 HOURS, IN THE RATIO OF 0.5 TO 20 MOLES OF ESTER PER MOLE OF SILICON MATERIAL.