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:
Nov. 01, 2016
Filed:
Sep. 19, 2013
Basf SE, Ludwigshafen, DE;
Karl Haeberle, Speyer, DE;
Maria Teresa Hechavarria Fonseca, Mannheim, DE;
Lars Rehling, Rahden, DE;
Frank Schaefer, Stemwede, DE;
Fatemeh Ahmadnian, Ludwigshafen, DE;
Heinrich Bollmann, Alfhausen, DE;
Markus Bubolz, Luebbecke, DE;
Carsten Buschmann, Dissen a. T. W., DE;
Guenter Scholz, Lemfoerde, DE;
Maria Thomas, Muehlen, DE;
BASF SE, Ludwigshafen, DE;
Abstract
A process for purifying a polycarbodiimide comprising (a) providing a mixture comprising a polycarbodiimide and a carbodiimidization catalyst; (b) separating carbodiimidization catalyst from the polycarbodiimide by subjecting the mixture according to (a) to a first distillation, (c) adding an entrainer to the first bottom product obtained from (b) to obtain a mixture; (d) further separating carbodiimidization catalyst from the polycarbodiimide by subjecting the mixture obtained from (c) to a second distillation.