Preparation of polymer powders

US7547741B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Joachim Pakusch · Ludwigshafen, DE
• Markus Koppers · Frankenthal (Pfalz), DE
• Wolfgang Gaschler · Shanghai, CN
• Heinrich Sack · Haßloch, DE
• Juergen Schmidt-Thuemmes · Schifferstadt, DE
• Hans-Juergen Denu · Lampertheim, DE

Key dates

• Filing date: May 10, 2004
• Grant date: Jun 16, 2009
• Expiry date: Jan 16, 2026

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C04B2103/0065
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A process for preparing a polymer powder by evaporating the volatile constituents from an aqueous dispersion of a film-forming polymer P, wherein prior to the evaporation of the volatile constituents the aqueous polymer dispersion still comprises drying assistants T, present in an amount of from 0.1 to 80% by weight, based on the polymer P of the dispersion, and there being used as drying assistant T polyvinylformamide. The polyvinylformamide used preferably has a K value (KW), determined by the method of Fikentscher in accordance with DIN 53726, of from 5 to 50.