Polyalkylene glycol lubricant compositions
AssigneeEthyl Petroleum Additives, Inc.
InventorsDavid K. Walters, Rodney I. Barber
Life of this patent
Estimating the term…
Abstract
A lubricant composition comprising a major proportion of polyalkylene glycol of lubricating viscosity and a minor proportion dissolved therein of (a) at least one sulphur-containing antiwear or extreme pressure agent, (b) at least one amine salt of at least one partially esterified monothiophosphoric acid, and (c) at least one amine salt of at least one partially esterified phosphoric acid. Such compositions have improved resistance to wear, oxidative degradation and metallic corrosion.
Claims21
A lubricant composition comprising a major proportion of polyalkylene glycol of lubricating viscosity and a minor proportion, dissolved therein, of (a) at least one sulfur-containing antiwear or extreme pressure agent, and (b) the combination of the components, (i) at least one amine salt of at least one partially esterified monothiophosphoric acid, and (ii) at least one amine salt of at least one partially esterified phosphoric acid, said combination and its components being present in an amount sufficient to insure that the lubricant composition remains clear, at ambient temperature, for at least three weeks after its formation.
An additive concentrate comprising, on a weight basis, a minor amount of inert diluent and a major amount of the following components in the weight proportions specified:
- a) 5 to 70% of at least one sulphur-containing antiwear or extreme pressure agent;
- b) 5 to 30% of at least one amine salt of at least one partially esterified monothiophosphoric acid;
- c) 1 to 30% of at least one amine salt of at least one partially esterified phosphoric acid;
- d) 10 to 40% of at least one sterically hindered phenolic antioxidant composed principally or entirely of one or more methylene-bridged alkylphenols;
- e) 10 to 40% of at least one aromatic amine antioxidant, and
- f) 0 to 15% of at least one corrosion inhibitor and/or metal deactivator.
A method for insuring that a lubricant composition, comprised of
- (i) polyalkylene glycol of lubricating viscosity, and
- (ii) a solublized minor amount of at least one sulfur-containing antiwear or extreme pressure agent
- remains clear, at ambient temperature, for at least three weeks after the formation of the lubricant composition, the method comprising, adding to the lubricant composition at least one amine salt of at least one partially esterified monothiophosphoric acid, and at least one amine salt of at least one partially esterified phosphoric acid in an amount sufficient to insure the before-recited clarity.
Dependencies are inferred from the claim text.