Oleaginous concentrates
AssigneeExxon Chemical Patents Inc.
InventorsGary Higton, Roger Glyde, Robert A. Wilkinson
Life of this patent
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Abstract
Concentrates for lubricating oil compositions are prepared by blending at elevated temperature: (A) at least one high molecular weight ashless dispersant; and (B) at least one oil-soluble metal detergent; in the presence of (C) at least one metal salt of a dihydrocarbylphosphorodithoic acid wherein the metal of the metal salt is an alkali metal, an alkaline earth metal, or zinc, aluminium, lead, tin, molybdenum, manganese, nickel or copper.
Claims13
A process for preparing an oleaginous concentrate suitable for a lubricating oil composition comprising blending at elevated temperature additive components (A) and (B) in the presence of additive component (C), wherein (A) is at least one high molecular weight ashless dispersant comprising an oil-soluble polymeric hydrocarbon backbone of number average molecular weight of 1,500 or greater having functional groups;
- (B) is at least one oil-soluble metal detergent;
- and (C) is at least one oil-soluble zinc salt of a phosphorus- and/or sulphur-containing acid.
Dependencies are inferred from the claim text.