Back to results
US 5,525,248 AGranted
Antioxidants and antiwear additives for lubricants
AssigneeMobil Oil Corporation
InventorsShih-Ying Hsu, Andrew G. Horodysky
Life of this patent
Estimating the term…
Abstract
Reaction products of organotin oxides, or halides such as dibutyltin oxide and tributyltin chloride and diorgano dithiophosphoric acids such as di-(2-ethylhexyl)dithiophosphoric acid are effective multifunctional antioxidant and antiwear additives in lubricants, greases and fuels.
Claims7
A process of making a lubricant composition having multifunctional antioxidant/antiwear properties comprising reacting:
- a. an organotin compound which has the formula:
- R.sub.a Sn(Y).sub.4-a
- where R is a hydrocarbyl group containing 2 to 20 carbon atoms, a is an integer ranging from 1 to 3, and Y is an oxygen atom;
- and
- b. a phosphoric acid to produce a reaction product comprising an additive and water;
- c. separating the additive from the reaction product water;
- and
- d. blending the additive with a lubricant.
5 more elements
Dependencies are inferred from the claim text.