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:
May. 08, 2012
Filed:
Jul. 02, 2010
Pieter Ooms, Krefeld, DE;
Andreas Bulan, Langenfeld, DE;
Johann Rechner, Kempen, DE;
Rainer Weber, Odenthal, DE;
Marc Buts, Duffel, BE;
Johan Vanden Eynde, Zwijnaarde, BE;
Pieter Ooms, Krefeld, DE;
Andreas Bulan, Langenfeld, DE;
Johann Rechner, Kempen, DE;
Rainer Weber, Odenthal, DE;
Marc Buts, Duffel, BE;
Johan Vanden Eynde, Zwijnaarde, BE;
Bayer MaterialScience AG, Leverkusen, DE;
Abstract
A combined process for the preparation of polycarbonate from bisphenols and diaryl carbonates, the monophenol liberated being reacted again for the preparation of the diaryl carbonate and the alkali metal halide forming in the preparation of the diaryl carbonate being converted by electrochemical oxidation, optionally over a gas diffusion electrode, into chlorine and alkali hydroxide solution, the chlorine being recycled into the preparation of the phosgene and the alkali hydroxide solution being recycled into the preparation of the diaryl carbonate.