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:
Oct. 31, 2006
Filed:
Apr. 14, 2005
Jörg Kirchhoff, Köln, DE;
Thomas König, Leverkusen, DE;
Klemens Kohlgrüber, Kürten, DE;
Steffen Kühling, Meerbusch, DE;
Dirk Van Meirvenne, Krefeld, DE;
Jörg Kirchhoff, Köln, DE;
Thomas König, Leverkusen, DE;
Klemens Kohlgrüber, Kürten, DE;
Steffen Kühling, Meerbusch, DE;
Dirk Van Meirvenne, Krefeld, DE;
Bayer MaterialScience AG, Leverkusen, DE;
Abstract
A process for the isolation of polycarbonate produced by the interfacial polymerization process is disclosed. Accordingly, the process entails (a) evaporating the organic solvent from the solution that contains solvent and polycarbonate to obtain a material system that contains 90 to 99.95% polycarbonate, the percent being relative to the weight of the system, and (b) passing the material system through inlet openings of a separating vessel to obtain a plurality of streams of polycarbonate, on entry into the inlet openings said material system being supersaturated with volatile constituents to an extent of at least 1 bar and having a temperature of 250° to 340° C. and a flow rate of 0.1 to 20 kg/hour, and (c) degassing the streams in the separating vessel wherein the pressure is 0.1 to 20 mbar to effect degassing of the polycarbonate.