Method of lubricating an internal combustion engine and improving the efficiency of the emissions control system of the engine

US7772171B2 · kind B2 · utility

Assignee

• The Lubrizol Corporation · US

Inventors

• Saleem Al-Ahmad · Euclid, US
• Melody A. Wilk · Timberlake, US
• Jack C. Kelley · Chagrin Falls, US
• John K. Pudelski · Cleveland Heights, US
• Paul E. Adams · Willoughby Hills, US
• Ewa A. Bardasz · Mentor, US

Key dates

• Filing date: Jul 17, 2006
• Grant date: Aug 10, 2010
• Expiry date: Apr 3, 2029

Classification

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

Abstract

An internal combustion engine with a catalyst-containing exhaust-gas aftertreatment device is lubricated with a composition of a base oil; and a zinc salt of a mixture of phosphorus-containing compounds having hydrocarbyl groups R1 and R2 where the average total number of carbon atoms in R1 plus R2 for the mixture of phosphorus-containing compounds is at least 9.5, where 4 to 30 weight percent of such groups contain 2 to 4 carbon atoms and where in less than 8 mole percent of the phosphorus-containing molecules in the mixture of phosphorus-containing compounds each of R1 and R2 contain 2 to 4 carbon atoms.