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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.:

US 10167364 B1

PDFFull Text
Expired
Date of Patent:
Jan. 01, 2019

Filed:

Feb. 15, 2016

Process for preparing polycarbonates by transesterifying dithiocarbonates or selenium analogues thereof with bisphenols

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:

K&L Gates LLP

Primary Examiner:

Terressa Boykin

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.

Find Patent Forward Citations

Müller, Thomas. (2019). Process for preparing polycarbonates by transesterifying dithiocarbonates or selenium analogues thereof with bisphenols (U.S. Patent No. 10167364). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/10167364

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

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