Preparation of phosphorus-containing antiwear compounds for use in lubricant compositions

摘要

A process is provided for preparing a salt of a hydroxy-substituted ester of phosphoric acid, comprising: (a) reacting a phosphate diester with an alkylene oxide, (b) reacting the product mixture of step (a) with a phosphating agent; and (c) reacting the product mixture of step (b) with an amine; wherein the phosphate diester is reacted with the alkylene oxide of step (a) in the substantial absence of a phosphate monoester. The product is useful as an antiwear agent.

主权项

1. A process for preparing a salt of a hydroxy-substituted ester of phosphoric acid, comprising:
(a) reacting a phosphate dialkyl diester represented by the formula (RO)2P(═O)—OH, where each R is independently an alkyl group having about 4 to about 30 carbon atoms, with a 1,2-alkylene oxide, (b) reacting a product mixture of step (a) with a phosphating agent; and (c) reacting a product mixture of step (b) with an amine;wherein the phosphate dialkyl diester is reacted with the alkylene oxide of step (a) in the substantial absence of a phosphate monoester, the amount of said phosphate monoester being 0 to 4 percent by weight of the total phosphate mono- and diester present.