Manufacture of dihydrocarbyl dithiophosphates
AssigneeExxon Chemical Patents Inc.
InventorsDavid R. Adams, Patrick F. Ginnelly
Life of this patent
Estimating the term…
Abstract
An alcohol and/or a carboxylic acid or carboxylate is used to reduce the proportion of sediment obtained in the manufacture of a metal or ammonium dihydrocarbyl dithiophosphate, for example, a zinc dihydrocarbyl dithiophosphate (ZDDP) for use as an antiwear agent/antioxidant in crankcase lubricating oils.
Claims17
A process for the manufacture of a metal or ammonium dihydrocarbyl dithiophosphate by reacting a dihydrocarbyl dithiophosphoric acid and a metal compound or an ammonium compound, which process comprises the step of mixing the acid, the metal compound or ammonium compound, and an added hydrocarbyl alcohol containing at least five carbon atoms to form a reaction mixture.
A process for the manufacture of a metal or ammonium dihydrocarbyl dithiophosphate which comprises reacting a dihydrocarbyl dithiophosphate acid with a metal compound or ammonium compound in the presence of an alcohol, a carboxylic acid or a salt thereof, and a complexing agent.
Dependencies are inferred from the claim text.