Polymer powders which are redispersible in water and can be prepared by atomizing aqueous polymer dispersions, and their use as additives in hydraulic binders

US5225478A · kind A · utility

Assignee

• BASF SE

Inventors

• Wilhelm Friedrich Beckerle · Frankenthal (Pfalz), DE
• Rolf Dersch · Bischofswerda, DE
• Gernot Franzmann · Worms, DE
• Brigitte Gareiss · Grünstadt, DE
• Ludger Leber · Schifferstadt, DE

Key dates

• Filing date: May 6, 1992
• Grant date: Jul 6, 1993
• Expiry date: May 6, 2012

Classification

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

Abstract

Polymer powders which are redispersible in water and are obtainable by atomizing aqueous polymer dispersions to which from 3 to 50% by weight, based on the polymer, of a water-soluble alkali metal salt or alkaline earth metal salt of a phenolsulfonic acid/formaldehyde condensate has been added are used as additives in hydraulic binders.