Preparation of polymer powders

US6469135B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Mario Sandor · Obrigheim, DE
• Joachim Pakusch · Ludwigshafen, DE
• Heinrich Sack · Haßloch, DE
• Markus Koppers · Frankenthal (Pfalz), DE
• Hans-Jurgen Denu · Friedelsheim, DE
• Rolf Gulden · Bischofswerda, DE

Key dates

• Filing date: Aug 21, 2001
• Grant date: Oct 22, 2002
• Expiry date: Aug 21, 2021

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02W30/91
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

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 C6-C32 alkyl group; the polymer powders obtainable by the process; and their use in binding mineral building materials.