The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 16, 2012
Filed:
Jan. 31, 2006
Guenter Scholz, Lemfoerde, DE;
Marian Mours, Weisenheim, DE;
Sven Lawrenz, Mannheim, DE;
Horst Papenfuss, Stemwede-Haldem, DE;
Christoph Bahr, Lembruch, DE;
Ruediger Krech, Diepholz, DE;
Guenter Scholz, Lemfoerde, DE;
Marian Mours, Weisenheim, DE;
Sven Lawrenz, Mannheim, DE;
Horst Papenfuss, Stemwede-Haldem, DE;
Christoph Bahr, Lembruch, DE;
Ruediger Krech, Diepholz, DE;
BASF Aktiengesellschaft, Ludwigshafen, DE;
Abstract
The present invention relates to a process for the continuous production of thermoplastically processable polyurethane elastomers, by metering a polyisocyanate (A), a proportion of 1-80 equivalent%, based on the isocyanate group content of the polyisocyanate (A), of a compound (B) having an average of at 1.8-3.0 hydrogen atoms having Zerewitinoff activity, with an average molar mass of 450-5000 g/mol, and a proportion of 12-99 equivalent%, based on the isocyanate group content of the polyisocyanate (A), of a chain extender (C), into a self-cleaning twin-screw extruder whose diameter is 32-62 mm, which is operated at shear rates above 6000 sand residence times of 1-20 seconds, and then bringing the mixture from the self-cleaning twin-screw extruder into a second apparatus in order to complete the reaction.