Basf Se Corporation

Michael Freese

Achim Stammer

Elmar Poeselt

Frank Schaefer

Andreas Bauder

Yasuyuki Suzuki

Etsuhiro Yamamoto

Torben Kaminsky

Dai Watanabe

Patrick Drawe

Kerstin Muelheims

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.

Continuous production of a PPG-based TPU

A process for producing particles of a thermoplastic polymer in spherical form involves providing at least one thermoplastic polymer in a molten state and providing an aqueous solution of at least one surface-active substance. The aqueous solution is in a temperature range from 100 to 300° C. The process also involves dispersing the thermoplastic polymer in the aqueous solution to obtain an aqueous solution containing dispersed thermoplastic polymer, which is cooled down to a temperature below the solidification point of the thermoplastic polymer to obtain a suspension containing an aqueous solution and particles of the thermoplastic polymer suspended in a solid state and in spherical form. The particles can be separated from the suspension and, optionally, dried. The particles obtained from the process have a particle size distribution having a d[4,3] value of more than 10 μm and a dvalue of more than 20 μm.

Method for producing spherical thermoplastic polymer particles

Growing community of inventors

Lemfoerde, Germany

Michael Freese