Lubricant formulation with high oxidation performance

US8569216B2 · kind B2 · utility

Assignee

• EXXONMOBIL RESEARCH AND ENGINEERING COMPANY · US

Inventors

• David A. Blain · Mount Laurel, US
• Liehpao O. Farng · Lawrenceville, US
• Eugenio Sanchez · Pitman, US
• Michael R. Douglass · Plano, US
• Angela S. Galiano-Roth · Mullica Hill, US
• James T. Carey · Medford, US

Key dates

• Filing date: Jun 16, 2011
• Grant date: Oct 29, 2013
• Expiry date: Feb 1, 2032

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C10N2040/25
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A Group IV/Group V lubricating composition providing improved antioxidation performance comprises from 5 wt. % to 40 wt. % of a Group V base oil component, such as alkylated naphthalene, at least 30 wt. % of a Group IV base oil component, such as one or more polyalphaolefin base stocks, and from 0.25 wt. % to 1.5 wt. % of a trithiophosphate-containing compound. The trithiophosphate-containing compound is preferably C30H57O7PS3. The lubricating composition includes not greater than 5 wt. % of a Group I, Group II, or Group III base oil component, and, preferably not greater than 10 ppm heavy metal component. The lubricating composition preferably has a kinematic viscosity of from 20 cSt to 1,000 cSt at 40° C. and a viscosity index (VI) of from 130 to 200.