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:
Jul. 31, 2007
Filed:
Jun. 28, 2005
Applicants:
Helmut-werner Heuer, Krefeld, DE;
Melanie Möthrath, Düsseldorf, DE;
Peter Snobl, Duisburg, DE;
Lothar Bunzel, Kempen, DE;
Thomas Pfingst, Tönisvorst, DE;
Marc Buts, Duffel, BE;
Lydia Simon, Shanghai, CN;
Inventors:
Helmut-Werner Heuer, Krefeld, DE;
Melanie Möthrath, Düsseldorf, DE;
Peter Snobl, Duisburg, DE;
Lothar Bunzel, Kempen, DE;
Thomas Pfingst, Tönisvorst, DE;
Marc Buts, Duffel, BE;
Lydia Simon, Shanghai, CN;
Assignee:
Bayer MaterialScience AG, Leverkusen, DE;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
C08G 64/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
An improvement to the melt transesterification process for the preparation of polycarbonate is disclosed. The improvement entails adding to the process between its medium viscosity reactor and a high viscosity reactor at least one bridged ester of organic sulphur-containing acid.