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. 22, 2002
Filed:
Aug. 21, 2001
Mario Sandor, Obrigheim, DE;
Joachim Pakusch, Speyer, DE;
Heinrich Sack, Hassloch, DE;
Markus Koppers, Maxdorf, DE;
Hans-Jürgen Denu, Friedelsheim, DE;
Rolf Gulden, Frankenthal, DE;
BASF Aktiengesellschaft, Ludwigshafen, DE;
Abstract
The present invention provides a process for preparing polymer powders by evaporating the volatile constituents from aqueous dispersions of film-forming polymers P in the presence of drying assistants T selected from the salts of oligomeric arylsulfonic acid-formaldehyde condensates wherein prior to the evaporation of the volatile constituents the aqueous polymer dispersion comprises at least 1.5% by weight, preferably at least 1.7% by weight, based on the polymer in the dispersion, of at least one anionic surface-active compound AO having at least one C -C alkyl group; the polymer powders obtainable by the process; and their use in binding mineral building materials.