Lubricating compositions containing sulphonates and phenates

US7678746B2 · kind B2 · utility

Assignee

• The Lubrizol Corporation · US

Inventors

• James P. Roski · Euclid, US
• Richard Leahy · El Segundo, US
• Stephen J. Cook · Belper, GB
• Alexandra Mayhew · Wirksworth, GB

Key dates

• Filing date: May 13, 2005
• Grant date: Mar 16, 2010
• Expiry date: Sep 14, 2027

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C10N2040/252
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A lubricating composition containing (a). at least 3 weight percent of an overbased sulphonate detergent with a metal ratio of 12.5:1 to 40:1; (b). at least 1.5 weight percent of a sulphur containing phenate detergent with a metal ratio of not more than 2.5; and (c). an oil of lubricating viscosity, wherein the sulphur containing phenate contains oligomers of hydrocarbyl phenol with at least 50 wt % of said oligomers in the form of the tetramer or higher oligomers. The composition is suitable for internal combustion engines, particularly marine diesel applications to provide improved cleanliness decreased cylinder wear and reduced deposits.