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:
Jan. 01, 2019
Filed:
Feb. 15, 2016
Applicant:
Covestro Deutschland Ag, Leverkusen, DE;
Inventors:
Thomas Ernst Müller, Aachen, DE;
Christoph Gürtler, Cologne, DE;
Nicolai Kolb, Aachen, DE;
Burkhard Köhler, Zierenberg, DE;
Walter Leitner, Aachen, DE;
Jan Heijl, Lokeren, BE;
Alexandra Große Böwing, Dormagen, DE;
Assignee:
COVESTRO DEUTSCHLAND AG, Leverkusen, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08G 64/38 (2006.01); B01J 27/057 (2006.01); C08G 64/20 (2006.01); C08K 5/38 (2006.01);
U.S. Cl.
CPC ...
C08G 64/38 (2013.01); B01J 27/0573 (2013.01); C08G 64/205 (2013.01); C08K 5/38 (2013.01); B01J 2219/00051 (2013.01); B01J 2219/00162 (2013.01);
Abstract
The present invention relates to a process for preparing aromatic polycarbonates, comprising the step of reacting bisphenols with dithiocarbonates or selenium analogs thereof in the presence of a catalyst. It further relates to the use of dithiocarbonates or selenium analogs thereof as transesterifying reagents for the preparation of polycarbonates.