Extrusion process for the preparation of polyurethane ureas

US4286080A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Bernd Quiring · Leverkusen, DE
• Wolfgang Wenzel · Bensberg, DE
• Georg Niederdellmann · Dormagen, DE
• Hans Wagner · Dormagen, DE
• Wilhelm Goyert · Leverkusen, DE

Key dates

• Filing date: Jun 20, 1980
• Grant date: Aug 25, 1981
• Expiry date: Jun 20, 2000

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G18/302
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention relates to a process for the preparation of polyurethane ureas from relatively high molecular weight polyols, diisocyanates, water as chain lengthening agent and optionally short chain glycols in a multishaft extruder equipped with kneading elements.