Polyolefin block copolymer viscosity modifier

US6110880A · kind A · utility

Assignee

• Exxon Chemical Patents, Inc. · US

Inventors

• Gary W. Verstrate · Matawan, US
• Charles Cozewith · Bellaire, US
• Thomas J. Pacansky · Penfield, US
• William M. Davis · Westfield, US
• Pratima Rangarajan · Schenectady, US

Key dates

• Filing date: Jun 24, 1997
• Grant date: Aug 29, 2000
• Expiry date: Jun 24, 2017

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C10N2040/50
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A viscosity modifier comprising a low molecular weight block copolymer including A blocks and B blocks, wherein the A blocks comprise at least about 93 wt. % polyethylene and the B blocks comprise a copolymer of between about 40 wt. % to 75 wt. % ethylene and at least one other .alpha.-olefin; wherein the resulting block copolymer has an average ethylene content of between about 60 wt. % to 80 wt. %.