Antioxidant combination and synthetic base oils containing the same

US9150812B2 · kind B2 · utility

Assignee

• EXXONMOBIL RESEARCH AND ENGINEERING COMPANY · US

Inventors

• Kathleen K. Cooper
• Angela S. Galiano-Roth · Mullica Hill, US
• David A. Blain · Mount Laurel, US
• Eugenio Sanchez · Pitman, US
• Nilka Yajaira Leon · Woodbury, US
• James T. Carey · Medford, US
• Oleg Yurievich Melnichenko · Cherry Hill, US

Key dates

• Filing date: Mar 8, 2013
• Grant date: Oct 6, 2015
• Expiry date: Mar 22, 2033

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C10N2040/30
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Disclosed are compositions of a major amount of alkylated aromatics compounds, in particular alkylated naphthalene and alkylated benzene, optionally combined with API Group II, Group III, Group IV and/or ethylene copolymers, showing improved thermo-oxidation performance when containing an additive combination including an alkylated or non-alkylated diarylamine and a sulfur-containing metal passivator. Particularly, the lubricating compositions include at least 55 wt % of a base oil selected from the group consisting of alkylated naphthalene, alkylated benzene and combinations thereof, and from 0 wt % to 45 wt % of another base oil component. The ratio of amine component to sulfur component in the additive combination is from 1:1 to 20:1. The compositions contain an amount of base oil other than alkylated naphthalene, alkylated benzene and API Group II, Group III, Group IV and/or ethylene copolymers of less than 10 wt % based on the total weight of the components comprising the lubricating composition.