Two-stage process for the preparation of thermoplastic polyurethane elastomers

US4597927A · kind A · utility

Assignee

• BASF SE

Inventors

• Gerhard Zeitler
• Frank Werner · Jackson, US
• Gerhard Bittner · Diepholz, DE
• Karl-Heinz Baumann · Viernheim, DE
• Artur Roeber · Ludwigshafen, DE
• Lothar Metzinger · Osnabrück, DE
• Rainer Ohlinger · Hannover, DE
• Hans D. Zettler · Havelsee, DE

Key dates

• Filing date: Jun 16, 1983
• Grant date: Jul 1, 1986
• Expiry date: Jun 16, 2003

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S425/046
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

In order to prepare thermoplastic polyurethane elastomers PA0 (a) organic diisocyanate, PA0 (b) polyhydroxyl compounds with molecular weights of 500 to 8,000, and PA0 (c) chain extenders with molecular weights of 60 to 400 in the presence of PA0 (d) catalysts, and optionally PA0 (e) auxiliaries, and/or PA0 (f) additives are reacted in two reaction stages at temperatures from 60.degree. C. to 250.degree. C. In the first reaction stage the components are continuously mixed, the reaction mixture is applied to a carrier, preferably a conveyor band of thermoplastic material, and is allowed to react at the reaction temperature until solidified. Subsequently, the solidified reaction mixture is melted in an extruder and the reaction is completed in the second reaction stage.