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:
Sep. 20, 2022
Filed:
Dec. 17, 2018
Applicant:
Lanxess Deutschland Gmbh, Cologne, DE;
Inventor:
Wilhelm Laufer, Ellerstadt, DE;
Assignee:
LANXESS Deutschland GmbH, Cologne, DE;
Primary Examiner:
Int. Cl.
CPC ...
C07C 267/00 (2006.01); C08G 18/79 (2006.01); C07C 263/16 (2006.01); C07C 263/18 (2006.01);
U.S. Cl.
CPC ...
C07C 267/00 (2013.01); C07C 263/16 (2013.01); C07C 263/18 (2013.01); C08G 18/797 (2013.01);
Abstract
The present disclosure provides new methods for preparing carbodiimides including steps of carbodiimidizing monomeric aromatic isocyanates in the presence of a catalyst, separating low boilers and catalyst from the reaction product in a thin-film evaporator, and distilling the residue from the thin-film evaporation in a further thin-film evaporator.