Stable high temperature liquid lubricant blends and antioxidant additives for use therewith

US5236610A · kind A · utility

Assignee

• The United States of America as represented by the Secretary of the Commerce · US

Inventors

• Joseph M. Perez · Nanuet, US
• Yuming Zhang · Nicholasville, US
• Chia-soon Ku · Cupertino, US
• Stephen M. Hsu · Travilah, US

Key dates

• Filing date: Feb 3, 1992
• Grant date: Aug 17, 1993
• Expiry date: Feb 3, 2012

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C10N2040/28
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

An antioxidant additive for an engine or propulsion system lubricant subjected to high temperatures which includes a high molecular weight substituted phenolic carboxylic acid tetraester of pentaerythritol. A lubricant blend which is capable of solubilizing the antioxidant additive and includes a polyolester, a phosphate ester and at least one of a polyalphaolefin and an alkylated naphthalene.