Process for the production of thermoplastic polyurethane elastomers

US4245081A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

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

Key dates

• Filing date: Apr 13, 1979
• Grant date: Jan 13, 1981
• Expiry date: Apr 13, 1999

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G18/10
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The instant invention is directed to a continuous process for the production of thermoplastic polyurethanes by reacting PA1 A. one or more substantially linear polyols having molecular weights in the range from 400 to 10,000, PA1 B. one or more organic diisocyanates and PA1 C. a hydroxyl-group-containing chain extender having a molecular weight below 250, the ratio of the NCO-groups in component (B) to the Zerewitinoff-active groups in components (A) and (C) lying between 0.90 and 1.2, in extruders, characterized in that the chain extender (C) used is a mixture of at least two different glycols, of which one is present in a quantity of from 50 to 99% by weight, based on the total amount of component (C), and a second in a quantity of from 1 to 50% by weight, based on the total amount of component (C).