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. 06, 1998
Filed:
Oct. 24, 1996
Norbert Guntherberg, Speyer, DE;
Jurgen Hofmann, Ludwigshafen, DE;
Hilmar Ohlig, Kaiserslautern, DE;
Elmar Mailahn, Worms, DE;
Friedrich Seitz, Friedelsheim, DE;
Hermann Gausepohl, Mutterstadt, DE;
Jurgen Koch, Neuhofen, DE;
Andreas Deckers, Flomborn, DE;
BASF Aktiengesellschaft, Ludwigshafen, DE;
Abstract
Essentially dry materials are obtained by mechanically dewatering water-moist rubber, prepared by emulsion polymerization and precipitation, to give a compact material having a rubber content of at least 50%, by a process in which the previously dewatered rubber is fed to the feed section of a twin-screw extruder which has screws rotating in the same direction and possesses, in succession in the conveying direction, at least two back-up zones and two associated dewatering orifices, each of which may be provided with a retaining screw, and at least one kneading zone, one devolatilization zone and finally one discharge zone, which may be closed by a die lip, and the water separated off is discharged at the dewatering orifices in liquid form.