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:
Dec. 05, 2006
Filed:
Oct. 14, 2003
Thomas König, Leverkusen, DE;
Klemens Kohlgrüber, Kürten, DE;
Ulrich Liesenfelder, Bergisch Gladbach, DE;
Michael Bierdel, Köln, DE;
Helmut Meyer, Odenthal, DE;
Richard Weider, Leverkusen, DE;
Jörg Krüger, Krefeld, DE;
Thomas König, Leverkusen, DE;
Klemens Kohlgrüber, Kürten, DE;
Ulrich Liesenfelder, Bergisch Gladbach, DE;
Michael Bierdel, Köln, DE;
Helmut Meyer, Odenthal, DE;
Richard Weider, Leverkusen, DE;
Jörg Krüger, Krefeld, DE;
Bayer Aktiengesellschaft, Leverkusen, DE;
Abstract
A process for concentrating polymers by evaporation is disclosed. The process entails (i) obtaining a mixture containing a polymer and volatile component, the volatile components being present in the mixture at an amount less than 20 wt. % relative to the weight of the mixture, and (ii) introducing the mixture in a downward direction under pressure through a plurality of nozzles arranged vertically and next to one another into a degassing container to form an extrudate. The volatile component contains at least one of residual monomers, oligomers and solvents, and the throughput of the mixture per nozzle is 0.3 to 2 kg/h. The vapor pressure of the volatile component of the extrudate is more than 2.5 bar, and the absolute pressure in the degassing container is 50 to 5000 Pa. The polymer prepared by the process is characterized in that it contains volatile components in an amount of less than 300 ppm.