Thermally stable phosphorothionates as antioxidant, antiwear, friction reducing and extreme pressure lubricant additives from cashew nut shell liquid

US6660696B1 · kind B1 · utility

Assignee

• Indian Oil Corporation Limited · IN

Inventors

• Rajeev Ranjan · College Park, US
• Ajay Kumar Arora · Faridabad, IN
• Rakesh Sarin · Faridabad, IN
• Deepak Kumar Tuli · Faridabad, IN
• Ram Prakash Verma · Mumbai, IN
• Akhilesh Kumar Bhatnagar · Faridabad, IN

Key dates

• Filing date: Jun 20, 2002
• Grant date: Dec 9, 2003
• Expiry date: Jun 20, 2022

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C10N2030/10
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Phosphorothionate derivatives derived from cashew nut shell liquid (CNSL) for use as an thermally stable antioxidant, antiwear, friction reducing and extreme pressure additive in a lubricant composition are synthesized by the steps of (a) partially hydrogenating distilled technical cashew nut shell liquid with palladium or nickel or platinum catalyst; to hydrogenate the olefinic chain; (b) reacting partially hydrogenated technical cashew nut shell liquid with phosphorus trihalide and sulphur, the reaction being carried out at a temperature ranging from 20 to 220° C. A lubricant containing a major proportion of a material selected from the group consisting of an oil of lubricating viscosity or a grease; and remainder an additive including CNSL phosphorothionate derivative, prepared by the foregoing process.