Synthetic polyester-based lubricants possessing a wide range of desirable physical characteristics including solubility in mineral oil

Claim 1

Synthetic polyester-based lubricant products prepared by the reaction of three classes of reactants in the presence of esterification catalyst and inert solvent capable of forming binary azeotropes with the water formed at the reaction temperatures, by: A. forming a reaction mixture of a. alkoxylated primary alkylmonoamine reactant containing 4 to 30 carbon atoms and an average of 2 to 50 alkoxy groups, b. monobasic alkanoic acid reactant containing from 1 to 30 carbon atoms, c. dibasic alkanoic acids containing from 2 to 12 carbon atoms, said reactants being present in the proportions, that for each mole of (a) present, from 1.85 to 0.05 moles of (b) and from 0.05 to 0.95 moles of (c) as well as: d. a catalytic quantity of esterification catalyst, and e. a substantial quantity of said inert solvent capable of forming binary azeotropes with the water formed at the reaction temperatures. B. heating said reaction mixture to reflux temperatures for a time sufficient to prepare said lubricant products and removing the water of reaction formed as said inert solvent-water binary azeotrope.