	US 7,538,076 B2
	Lubricant and concentrate compositions comprising hindered-phenol-containing diester antioxidant and method thereof
Jason R. Brown, North Ridgeville, Ohio (US); Jonathan S. Vilardo, Willoughby, Ohio (US); Virginia A. Carrick, Chardon, Ohio (US); William D. Abraham, Concord Township, Ohio (US); and Paul E. Adams, Willoughby Hills, Ohio (US)
Assigned to The Lubrizol Corporation, Wickliffe, Ohio (US)
Filed on Mar. 28, 2005, as Appl. No. 11/91,177.
Prior Publication US 2006/0217274 A1, Sep. 28, 2006
Int. Cl. C10L 1/22 (2006.01)

U.S. Cl. 508—477

14 Claims

1. A lubricant composition, comprising:

(A) a major amount of an oil of lubricating viscosity;

(B) a minor amount of at least one hindered-phenol-containing diester antioxidant wherein said antioxidant is formed from a 3-(3,5-di-t-alkyl-4-hydroxyphenyl)propionic acid or a reactive equivalent thereof and a 1,2-alkanediol; and

(C) a minor amount of at least one other additive selected from the group consisting of viscosity modifiers, pour point depressants, dispersants, detergents, antiwear agents, antioxidants that are different from component (B), friction modifiers, corrosion inhibitors, seal swell agents, metal deactivators, foam inhibitors, and mixtures thereof.