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:
Apr. 16, 2013
Filed:
Sep. 10, 2007
Helmut Meffert, Bobenheim am Berg, DE;
Marianna Pierobon, Ludwigshafen, DE;
Ates Erk, Karlsruhe, DE;
Hermann Josef Feise, Kleinniedesheim, DE;
Robert Bayer, Sinsheim, DE;
Helmut Meffert, Bobenheim am Berg, DE;
Marianna Pierobon, Ludwigshafen, DE;
Ates Erk, Karlsruhe, DE;
Hermann Josef Feise, Kleinniedesheim, DE;
Robert Bayer, Sinsheim, DE;
BASF SE, Ludwigshafen, DE;
Abstract
A method for removing residual styrene monomers from co-extrudates comprising polystyrene and water-insoluble, crosslinked polyvinylpyrrolidone, which comprises subjecting an aqueous suspension of the particulate solid co-extrudate to a heat treatment at temperatures of 60 to 99° C., the weight ratio of solid co-extrudate to water in the suspension being 1:1.5 to 1:20, and the concentration of the suspension being kept constant during the treatment.