Hydrogenated nitrile rubber with narrow molecular weight distribution, a process for its preparation and a method of use

US7737193B2 · kind B2 · utility

Assignee

• LANXESS Deutschland GmbH · DE

Inventors

• Lothar Reif · Dormagen, DE
• Stephen Pask · Dormagen, DE

Key dates

• Filing date: Dec 11, 2006
• Grant date: Jun 15, 2010
• Expiry date: Aug 22, 2027

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08C19/08
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A novel process produces a novel hydrogenated nitrile rubber (B) which features a very narrow molecular weight distribution and a correspondingly low value for the polydispersity index. The preparation process encompasses the treatment of a hydrogenated nitrile rubber (A) with ultrasound, whereupon the resultant hydrogenated nitrile rubber (B) has a lower weight-average molecular weight (Mw) than the hydrogenated nitrile rubber (A). The resultant hydrogenated nitrile rubber (B) has excellent suitability for the production of mouldings via processing by extrusion processes or by injection-moulding processes.