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:
Dec. 23, 2025
Filed:
Dec. 14, 2021
Applicant:
Basf SE, Ludwigshafen am Rhein, DE;
Inventors:
Caroline Beyer, Ludwigshafen am Rhein, DE;
Florian Richter, Ludwigshafen am Rhein, DE;
Assignee:
BASF SE, Ludwigshafen am Rhein, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08J 11/16 (2006.01); C07D 223/10 (2006.01);
U.S. Cl.
CPC ...
C08J 11/16 (2013.01); C07D 223/10 (2013.01); C08J 2375/04 (2013.01); C08J 2377/02 (2013.01); Y02W 30/62 (2015.05);
Abstract
A process for obtaining caprolactam from mixtures of caprolactam-containing polymers and polyurethane-containing polymers, in particular polyurethane block copolymers, by depolymerization, wherein the depolymerization of the mixture is performed in the presence of 0.05% to 5% by weight of a base at a temperature of 250° C. to 350° C. and a pressure of 5 to 700 mbar and wherein the caprolactam is obtained in gaseous form.