Lubricating oil compositions

US6992049B2 · kind B2 · utility

Assignee

• EXXONMOBIL RESEARCH AND ENGINEERING COMPANY · US

Inventors

• Douglas E. Deckman · Mullica Hill, US
• William L. Maxwell · Clark, US
• William H. Buck · West Chester, US
• Mark Winemiller · Clarksboro, US
• David J. Baillargeon · Cherry Hill, US

Key dates

• Filing date: Jan 28, 2003
• Grant date: Jan 31, 2006
• Expiry date: Sep 19, 2023

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C10N2030/02
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

The present invention provides a viscosity index improving lubricant additive which comprises an olefinic oligomer of about 2,000 to about 20,000 number average molecular weight having a viscosity of 75 to about 3,000 cSt at 100° C. and a hydrocarbyl aromatic which contains at least about 5% of its weight from aromatic moieties having a viscosity of about 3 to about 50 cSt at 100° C. where the weight ratio of hydrocarbyl aromatic component to olefin oligomer is from about 1:2 to about 50:1. In another aspect, the invention provides for a lubricating oil composition comprising a base oil and the instant viscosity index improving additive.