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:
Jul. 01, 2014
Filed:
Jun. 11, 2008
Philippe Desbois, Edingen-Neckarhausen, DE;
Michael Kopietz, Grunstadt, DE;
Ralf Neuhaus, Heidelberg, DE;
Hagen Stawitzki, Karlsruhe, DE;
Hans-joachim Weis, Speyer, DE;
Jochen Engelmann, Singapore, DE;
Philippe Desbois, Edingen-Neckarhausen, DE;
Michael Kopietz, Grunstadt, DE;
Ralf Neuhaus, Heidelberg, DE;
Hagen Stawitzki, Karlsruhe, DE;
Hans-Joachim Weis, Speyer, DE;
Jochen Engelmann, Singapore, DE;
BASF SE, Ludwigshafen, DE;
Abstract
In a process for preparing a polyamide based on dicarboxylic acids and diamines in an extruder, a solid mixture comprising a monomer mixture composed of 50 mol % of dicarboxylic acid mixture composed of from 60 to 88 % by weight of terephthalic acid and from 12 to 40% by weight of isophthalic acid, in which up to 20% by weight of the dicarboxylic acid mixture may also be replaced by other dicarboxylic acids, and 50 mol % of hexamethylenediamine which may be up to 20% by weight replaced by other C-diamines, in a corotatory twin-screw extruder for a residence time of from 10 seconds to 30 minutes, is heated to a temperature in the range from 150 to 400° C. while removing steam and if appropriate diamines through venting orifices.