Viscosity index improver for lubricant compositions

US8486878B2 · kind B2 · utility

Assignee

• DOW GLOBAL TECHNOLOGIES LLC · US

Inventors

• Colin Li Pi Shan · Pearland, US
• Roger L. Kuhlman · Lake Jackson, US
• Gary L. Rath · Pearland, US
• Pamela J. Kenny · Lake Jackson, US
• Morgan M. Hughes · Angleton, US
• Rongjuan Cong · Lake Jackson, US

Key dates

• Filing date: Jul 14, 2008
• Grant date: Jul 16, 2013
• Expiry date: Mar 15, 2030

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C10N2050/10
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A lubricant composition comprises a base oil and a viscosity modifier including an ethylene/α-olefin interpolymer. The ethylene/α-olefin interpolymer has at least a hard segment and at least a soft segment. The soft segment contains a higher amount of comonomers than the hard segment. The hard segment has low crystallinity. The copolymer has a number of unique characteristics disclosed herein. Such copolymers offer the possibility of improved low temperature performance and flexibility in formulating motor oil, gear lubricants and greases, etc.