Continuous production of a PPG-based TPU

US12168712B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Frank Schaefer · Lörrach, DE
• Michael Freese · Lemförde, DE
• Elmar Poeselt · Lemförde, DE
• Etsuhiro Yamamoto · Yatomi, JP
• Yasuyuki Suzuki · Tokyo, JP
• Dai Watanabe · Yokkaichi, JP
• Patrick Drawe · Lemförde, DE

Key dates

• Filing date: Nov 29, 2019
• Grant date: Dec 17, 2024
• Expiry date: Nov 26, 2041

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G18/7671
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A thermoplastic polyurethane having a glass transition temperature of the soft phase of not more than −25° C. measured using DMA and a heating rate of 2K/min at 1 Hz under torsion based on DIN EN ISO 6721: 2016; maximum G″ can be obtained by a process at least including the reaction of a polyol composition including a polypropylene glycol, wherein the proportion of the secondary terminal OH groups based on the total number of terminal OH groups of the polypropylene glycol is in the range of more than 90%, with a polyisocyanate to obtain a polyol composition including a prepolymer and the reaction of the polyol composition including the prepolymer with a polyisocyanate composition including at least one polyisocyanate and at least one chain extender having a molecular weight <500 g/mol. The thermoplastic polyurethane may be used for producing injection molded products, extruded products, films, profiles and shaped articles.