Preparation of polymer powders

US6291573A · kind A · utility

Assignee

• BASF SE

Inventors

• Joachim Pakusch · Ludwigshafen, DE
• Bernd Reck · Arnstadt, DE
• Peter Claassen · Ludwigshafen, DE
• Hans-Jurgen Denu · Friedelsheim, DE
• Eckehardt Wistuba · Bad Dürkheim, DE
• Claudia Heibel · Weinheim, DE

Key dates

• Filing date: Dec 14, 1998
• Grant date: Sep 18, 2001
• Expiry date: Dec 14, 2018

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08J2325/08
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The present invention relates to a process for preparing polymer powders from aqueous polymer dispersions in which the dispersed polymer P comprises in copolymerized form: PA1 i) at least one vinylaromatic monomer (a), PA1 ii) 1,3-butadiene as monomer (b), and PA1 iii) one or more monomers (c) different than the monomers (a) and (b), which comprises drying the aqueous polymer dispersion in the presence of polyvinyl alcohol as drying agent. The present invention also relates to the polymer powders obtainable by this process and to the use of these polymer powders as binders in paints, varnishes and coating compositions generally, in adhesives, and for modifying mineral construction materials. The present invention also relates to mineral construction materials in the form of dry formulations comprising the polymer powders of the invention.