Thermoplastic polyurethane elastomers

US6417312B1 · kind B1 · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Stephan Kirchmeyer · Leverkusen, DE
• Hanns P. Muller · Leverkusen, DE
• Martin Ullrich · Leverkusen, DE
• Ulrich Liesenfelder · Bensberg, DE

Key dates

• Filing date: May 31, 1996
• Grant date: Jul 9, 2002
• Expiry date: May 31, 2016

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G2125/00
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A process for the production of thermoplastic polyurethane elastomer is disclosed. The process entails (a) introducing and homogeneously mixing in a first static mixer (A) an isocyanate and (B) a mixture of compounds having an average of 1.8 to 3.0 Zerewitinoff active hydrogen atoms having a molecular weight of 400 to 10000 with and chain extenders having an average of 1.8 to 3.0 Zerewitinoff active hydrogen atoms and a molecular weight of 62 to 400 and optional auxiliaries to form a substantially unreacted mixture and (b) reacting said substantially unreacted mixture in a second static mixer to form thermoplastic polyurethane elastomer. The elastomer thus produced has improved mechanical properties and is suitable for the production of moldings.