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:
Feb. 26, 2013
Filed:
May. 26, 2010
Thomas König, Leverkusen, DE;
Klemens Kohlgrüber, Kürten, DE;
René DE Cleyn, Wuustwezel, BE;
Johan Vaes, Kalmthout, BE;
Johan Vanden Eynde, Zwijnaarde, BE;
Dirk Van Meirvenne, Langenfeld, DE;
Thomas König, Leverkusen, DE;
Klemens Kohlgrüber, Kürten, DE;
René De Cleyn, Wuustwezel, BE;
Johan Vaes, Kalmthout, BE;
Johan Vanden Eynde, Zwijnaarde, BE;
Dirk Van Meirvenne, Langenfeld, DE;
Bayer MaterialScience AG, Leverkusen, DE;
Abstract
The invention relates to an apparatus and a process for devolatilizing solvent-containing polycarbonate solutions. By employing the inventive apparatus, polycarbonates with low residual values of volatile constituents are produced from solvent-containing polymer melts, which improved optical properties, especially yellowness index, with the aid of an apparatus combination of a heatable tubular devolatilizer and a vented extruder.