Lubricant

Claim 1

A LUBRICANT CONSISTING ESSENTIALLY OF THE CONDENSATION REACTION PRODUCT OF (A) A MONOESTER OF (I) AN ACIDIC MEMBER SELECTED FROM THE CLASS CONSISTING OF BENZENE CARBOXYLIC ACIDS HAVING 3 CARBOXYL GROUPS AND ANHYDRIDES THEREOF AND (II) A SATURATED ALIPHATIC C, H, O MONOHYDRIC ALCOHOL OF FROM AT LEAST ABOUT 4 TO NOT MORE THAN 18 CARBON ATOMS, SAID MONOESTER HAVING A MOLE RATIN OF SAID ACIDIC MEMBER TO SAID ALCOHOL OF FROM ABOUT 1:09 TO ABOUT 1:1,1, AND (B) AN ALKYLENE GLYCOL OF FROM 2 TO ABOUT 20 CARBON ATOMS AND AT LEAST ONE DICARBOXYLIC ACID SELECTED FROM THE CLASS CONSISTING OF (A) BENZENE DICARBOXYLIC ACID AND (B) ALKANEDIOIC ACID OF FROM 4 TO ABOUT 20 CARBON ATOMS, AND (C) MIXTURES THEREOF, SAID BENZENE DICARBOXYLIC ACID BEING PRESENT IN AN AMOUNT FROM "ZERO" TO NOT MORE THAN 1 MOLE PER MOLE OF SAID ACIDIC MEMBER, SAID ALKANEDIOIC ACID BEING PRESENT IN AN AMOUNT FROM "ZERO" TO NOT MORE THAN 2.3 MOLES PER MOLE OF SAID ACIDIC MEMBER, WHEN SAID BENZENE DICARBOXYLIC ACID IS "ZERO" THEN THE AMOUNT OF SAID ALKANEDIOIC ACID IS AT LEAST 0.3, WHEN SAID ALKANEDIOIC ACID IS "ZERO" THEN THE AMOUNT OF SAID BENZENE DICARBOXYLIC ACID IS AT LEAST 0.2, AND MIXTURES OF SAID DICARBOXYLIC ACIDS BEING PRESENT IN RELATIVE AMOUNTS BASED ON SAID HEREINBEFORE SET OUT RATIOS, SAID GLYCOL BEING PRESENT IN AN AMOUNT TO REACT WITH THE FREE-CARBOXYL GROUPS PRESENT, WITH CONTINUOUS WITHDRAWAL OF WATER OF REACTION UNTIL CONDENSATION REACTION IS ESSENTIALLY COMPLETE, TO OBTAIN A LUBRICANT PRODUCT HAVING AN ACID NUMBER OF NOT MORE THAN ABOUT 30.